true to enable list
+ * item sorting.
+ */
+ public void setSortEnabled(boolean enabled) {
+ mSortEnabled = enabled;
+ }
+
+ public boolean isSortEnabled() {
+ return mSortEnabled;
+ }
+
+ /**
+ * One of {@link CLICK_REMOVE}, {@link FLING_RIGHT_REMOVE},
+ * {@link FLING_LEFT_REMOVE},
+ * {@link SLIDE_RIGHT_REMOVE}, or {@link SLIDE_LEFT_REMOVE}.
+ */
+ public void setRemoveMode(int mode) {
+ mRemoveMode = mode;
+ }
+
+ public int getRemoveMode() {
+ return mRemoveMode;
+ }
+
+ /**
+ * Enable/Disable item removal without affecting remove mode.
+ */
+ public void setRemoveEnabled(boolean enabled) {
+ mRemoveEnabled = enabled;
+ }
+
+ public boolean isRemoveEnabled() {
+ return mRemoveEnabled;
+ }
+
+ /**
+ * Set the resource id for the View that represents the drag
+ * handle in a list item.
+ *
+ * @param id An android resource id.
+ */
+ public void setDragHandleId(int id) {
+ mDragHandleId = id;
+ }
+
+ /**
+ * Set the resource id for the View that represents the fling
+ * handle in a list item.
+ *
+ * @param id An android resource id.
+ */
+ public void setFlingHandleId(int id) {
+ mFlingHandleId = id;
+ }
+
+ /**
+ * Set the resource id for the View that represents click
+ * removal button.
+ *
+ * @param id An android resource id.
+ */
+ public void setClickRemoveId(int id) {
+ mClickRemoveId = id;
+ }
+
+ /**
+ * Sets flags to restrict certain motions of the floating View
+ * based on DragSortController settings (such as remove mode).
+ * Starts the drag on the DragSortListView.
+ *
+ * @param position The list item position (includes headers).
+ * @param deltaX Touch x-coord minus left edge of floating View.
+ * @param deltaY Touch y-coord minus top edge of floating View.
+ *
+ * @return True if drag started, false otherwise.
+ */
+ public boolean startDrag(int position, int deltaX, int deltaY) {
+
+ int dragFlags = 0;
+ if (mSortEnabled && !mIsRemoving) {
+ dragFlags |= DragSortListView.DRAG_POS_Y | DragSortListView.DRAG_NEG_Y;
+ }
+ if (mRemoveEnabled && mIsRemoving) {
+ dragFlags |= DragSortListView.DRAG_POS_X;
+ dragFlags |= DragSortListView.DRAG_NEG_X;
+ }
+
+ mDragging = mDslv.startDrag(position - mDslv.getHeaderViewsCount(), dragFlags, deltaX,
+ deltaY);
+ return mDragging;
+ }
+
+ @Override
+ public boolean onTouch(View v, MotionEvent ev) {
+ if (!mDslv.isDragEnabled() || mDslv.listViewIntercepted()) {
+ return false;
+ }
+
+ mDetector.onTouchEvent(ev);
+ if (mRemoveEnabled && mDragging && mRemoveMode == FLING_REMOVE) {
+ mFlingRemoveDetector.onTouchEvent(ev);
+ }
+
+ int action = ev.getAction() & MotionEvent.ACTION_MASK;
+ switch (action) {
+ case MotionEvent.ACTION_DOWN:
+ mCurrX = (int) ev.getX();
+ mCurrY = (int) ev.getY();
+ break;
+ case MotionEvent.ACTION_UP:
+ if (mRemoveEnabled && mIsRemoving) {
+ int x = mPositionX >= 0 ? mPositionX : -mPositionX;
+ int removePoint = mDslv.getWidth() / 2;
+ if (x > removePoint) {
+ mDslv.stopDragWithVelocity(true, 0);
+ }
+ }
+ case MotionEvent.ACTION_CANCEL:
+ mIsRemoving = false;
+ mDragging = false;
+ break;
+ }
+
+ return false;
+ }
+
+ /**
+ * Overrides to provide fading when slide removal is enabled.
+ */
+ @Override
+ public void onDragFloatView(View floatView, Point position, Point touch) {
+
+ if (mRemoveEnabled && mIsRemoving) {
+ mPositionX = position.x;
+ }
+ }
+
+ /**
+ * Get the position to start dragging based on the ACTION_DOWN
+ * MotionEvent. This function simply calls
+ * {@link #dragHandleHitPosition(MotionEvent)}. Override
+ * to change drag handle behavior;
+ * this function is called internally when an ACTION_DOWN
+ * event is detected.
+ *
+ * @param ev The ACTION_DOWN MotionEvent.
+ *
+ * @return The list position to drag if a drag-init gesture is
+ * detected; MISS if unsuccessful.
+ */
+ public int startDragPosition(MotionEvent ev) {
+ return dragHandleHitPosition(ev);
+ }
+
+ public int startFlingPosition(MotionEvent ev) {
+ return mRemoveMode == FLING_REMOVE ? flingHandleHitPosition(ev) : MISS;
+ }
+
+ /**
+ * Checks for the touch of an item's drag handle (specified by
+ * {@link #setDragHandleId(int)}), and returns that item's position
+ * if a drag handle touch was detected.
+ *
+ * @param ev The ACTION_DOWN MotionEvent.
+
+ * @return The list position of the item whose drag handle was
+ * touched; MISS if unsuccessful.
+ */
+ public int dragHandleHitPosition(MotionEvent ev) {
+ return viewIdHitPosition(ev, mDragHandleId);
+ }
+
+ public int flingHandleHitPosition(MotionEvent ev) {
+ return viewIdHitPosition(ev, mFlingHandleId);
+ }
+
+ public int viewIdHitPosition(MotionEvent ev, int id) {
+ final int x = (int) ev.getX();
+ final int y = (int) ev.getY();
+
+ int touchPos = mDslv.pointToPosition(x, y); // includes headers/footers
+
+ final int numHeaders = mDslv.getHeaderViewsCount();
+ final int numFooters = mDslv.getFooterViewsCount();
+ final int count = mDslv.getCount();
+
+ // Log.d("mobeta", "touch down on position " + itemnum);
+ // We're only interested if the touch was on an
+ // item that's not a header or footer.
+ if (touchPos != AdapterView.INVALID_POSITION && touchPos >= numHeaders
+ && touchPos < (count - numFooters)) {
+ final View item = mDslv.getChildAt(touchPos - mDslv.getFirstVisiblePosition());
+ final int rawX = (int) ev.getRawX();
+ final int rawY = (int) ev.getRawY();
+
+ View dragBox = id == 0 ? item : (View) item.findViewById(id);
+ if (dragBox != null) {
+ dragBox.getLocationOnScreen(mTempLoc);
+
+ if (rawX > mTempLoc[0] && rawY > mTempLoc[1] &&
+ rawX < mTempLoc[0] + dragBox.getWidth() &&
+ rawY < mTempLoc[1] + dragBox.getHeight()) {
+
+ mItemX = item.getLeft();
+ mItemY = item.getTop();
+
+ return touchPos;
+ }
+ }
+ }
+
+ return MISS;
+ }
+
+ @Override
+ public boolean onDown(MotionEvent ev) {
+ if (mRemoveEnabled && mRemoveMode == CLICK_REMOVE) {
+ mClickRemoveHitPos = viewIdHitPosition(ev, mClickRemoveId);
+ }
+
+ mHitPos = startDragPosition(ev);
+ if (mHitPos != MISS && mDragInitMode == ON_DOWN) {
+ startDrag(mHitPos, (int) ev.getX() - mItemX, (int) ev.getY() - mItemY);
+ }
+
+ mIsRemoving = false;
+ mCanDrag = true;
+ mPositionX = 0;
+ mFlingHitPos = startFlingPosition(ev);
+
+ return true;
+ }
+
+ @Override
+ public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
+
+ final int x1 = (int) e1.getX();
+ final int y1 = (int) e1.getY();
+ final int x2 = (int) e2.getX();
+ final int y2 = (int) e2.getY();
+ final int deltaX = x2 - mItemX;
+ final int deltaY = y2 - mItemY;
+
+ if (mCanDrag && !mDragging && (mHitPos != MISS || mFlingHitPos != MISS)) {
+ if (mHitPos != MISS) {
+ if (mDragInitMode == ON_DRAG && Math.abs(y2 - y1) > mTouchSlop && mSortEnabled) {
+ startDrag(mHitPos, deltaX, deltaY);
+ } else if (mDragInitMode != ON_DOWN
+ && Math.abs(x2 - x1) > mTouchSlop && mRemoveEnabled) {
+ mIsRemoving = true;
+ startDrag(mFlingHitPos, deltaX, deltaY);
+ }
+ } else if (mFlingHitPos != MISS) {
+ if (Math.abs(x2 - x1) > mTouchSlop && mRemoveEnabled) {
+ mIsRemoving = true;
+ startDrag(mFlingHitPos, deltaX, deltaY);
+ } else if (Math.abs(y2 - y1) > mTouchSlop) {
+ mCanDrag = false; // if started to scroll the list then
+ // don't allow sorting nor fling-removing
+ }
+ }
+ }
+ // return whatever
+ return false;
+ }
+
+ @Override
+ public void onLongPress(MotionEvent e) {
+ // Log.d("mobeta", "lift listener long pressed");
+ if (mHitPos != MISS && mDragInitMode == ON_LONG_PRESS) {
+ mDslv.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
+ startDrag(mHitPos, mCurrX - mItemX, mCurrY - mItemY);
+ }
+ }
+
+ // complete the OnGestureListener interface
+ @Override
+ public final boolean onFling(MotionEvent e1,
+ MotionEvent e2, float velocityX, float velocityY) {
+ return false;
+ }
+
+ // complete the OnGestureListener interface
+ @Override
+ public boolean onSingleTapUp(MotionEvent ev) {
+ if (mRemoveEnabled && mRemoveMode == CLICK_REMOVE) {
+ if (mClickRemoveHitPos != MISS) {
+ mDslv.removeItem(mClickRemoveHitPos - mDslv.getHeaderViewsCount());
+ }
+ }
+ return true;
+ }
+
+ // complete the OnGestureListener interface
+ @Override
+ public void onShowPress(MotionEvent ev) {
+ // do nothing
+ }
+
+ private GestureDetector.OnGestureListener mFlingRemoveListener =
+ new GestureDetector.SimpleOnGestureListener() {
+ @Override
+ public final boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
+ float velocityY) {
+ // Log.d("mobeta", "on fling remove called");
+ if (mRemoveEnabled && mIsRemoving) {
+ int w = mDslv.getWidth();
+ int minPos = w / 5;
+ if (velocityX > mFlingSpeed) {
+ if (mPositionX > -minPos) {
+ mDslv.stopDragWithVelocity(true, velocityX);
+ }
+ } else if (velocityX < -mFlingSpeed) {
+ if (mPositionX < minPos) {
+ mDslv.stopDragWithVelocity(true, velocityX);
+ }
+ }
+ mIsRemoving = false;
+ }
+ return false;
+ }
+ };
+
+}
diff --git a/src/com/liquid/liquidlounge/preferences/dslv/DragSortItemView.java b/src/com/liquid/liquidlounge/preferences/dslv/DragSortItemView.java
new file mode 100644
index 00000000..0cac3bff
--- /dev/null
+++ b/src/com/liquid/liquidlounge/preferences/dslv/DragSortItemView.java
@@ -0,0 +1,118 @@
+/*
+ * Copyright 2012 Carl Bauer
+ * Copyright (C) 2014 SlimRoms Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.liquid.liquidlounge.preferences.dslv;
+
+import android.content.Context;
+import android.view.Gravity;
+import android.view.View;
+import android.view.View.MeasureSpec;
+import android.view.ViewGroup;
+import android.widget.AbsListView;
+import android.util.Log;
+
+/**
+ * Lightweight ViewGroup that wraps list items obtained from user's
+ * ListAdapter. ItemView expects a single child that has a definite
+ * height (i.e. the child's layout height is not MATCH_PARENT).
+ * The width of
+ * ItemView will always match the width of its child (that is,
+ * the width MeasureSpec given to ItemView is passed directly
+ * to the child, and the ItemView measured width is set to the
+ * child's measured width). The height of ItemView can be anything;
+ * the
+ *
+ *
+ * The purpose of this class is to optimize slide
+ * shuffle animations.
+ */
+public class DragSortItemView extends ViewGroup {
+
+ private int mGravity = Gravity.TOP;
+
+ public DragSortItemView(Context context) {
+ super(context);
+
+ // always init with standard ListView layout params
+ setLayoutParams(new AbsListView.LayoutParams(
+ ViewGroup.LayoutParams.FILL_PARENT,
+ ViewGroup.LayoutParams.WRAP_CONTENT));
+
+ //setClipChildren(true);
+ }
+
+ public void setGravity(int gravity) {
+ mGravity = gravity;
+ }
+
+ public int getGravity() {
+ return mGravity;
+ }
+
+ @Override
+ protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+ final View child = getChildAt(0);
+
+ if (child == null) {
+ return;
+ }
+
+ if (mGravity == Gravity.TOP) {
+ child.layout(0, 0, getMeasuredWidth(), child.getMeasuredHeight());
+ } else {
+ child.layout(0, getMeasuredHeight() - child.getMeasuredHeight(),
+ getMeasuredWidth(), getMeasuredHeight());
+ }
+ }
+
+ /**
+ *
+ */
+ @Override
+ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+
+ int height = MeasureSpec.getSize(heightMeasureSpec);
+ int width = MeasureSpec.getSize(widthMeasureSpec);
+
+ int heightMode = MeasureSpec.getMode(heightMeasureSpec);
+
+ final View child = getChildAt(0);
+ if (child == null) {
+ setMeasuredDimension(0, width);
+ return;
+ }
+
+ if (child.isLayoutRequested()) {
+ // Always let child be as tall as it wants.
+ measureChild(child, widthMeasureSpec,
+ MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
+ }
+
+ if (heightMode == MeasureSpec.UNSPECIFIED) {
+ ViewGroup.LayoutParams lp = getLayoutParams();
+
+ if (lp.height > 0) {
+ height = lp.height;
+ } else {
+ height = child.getMeasuredHeight();
+ }
+ }
+
+ setMeasuredDimension(width, height);
+ }
+
+}
diff --git a/src/com/liquid/liquidlounge/preferences/dslv/DragSortListView.java b/src/com/liquid/liquidlounge/preferences/dslv/DragSortListView.java
new file mode 100644
index 00000000..96767e67
--- /dev/null
+++ b/src/com/liquid/liquidlounge/preferences/dslv/DragSortListView.java
@@ -0,0 +1,3067 @@
+/*
+ * Copyright 2012 Carl Bauer
+ * Copyright (C) 2014 SlimRoms Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.liquid.liquidlounge.preferences.dslv;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.database.DataSetObserver;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Point;
+import android.graphics.drawable.Drawable;
+import android.os.Environment;
+import android.os.SystemClock;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.util.SparseBooleanArray;
+import android.util.SparseIntArray;
+import android.view.Gravity;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.AbsListView;
+import android.widget.BaseAdapter;
+import android.widget.Checkable;
+import android.widget.ListAdapter;
+import android.widget.ListView;
+
+import com.android.settings.R;
+
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.ArrayList;
+
+/**
+ * ListView subclass that mediates drag and drop resorting of items.
+ *
+ *
+ * @author heycosmo
+ *
+ */
+public class DragSortListView extends ListView {
+
+ /**
+ * The View that floats above the ListView and represents
+ * the dragged item.
+ */
+ private View mFloatView;
+
+ /**
+ * The float View location. First based on touch location
+ * and given deltaX and deltaY. Then restricted by callback
+ * to FloatViewManager.onDragFloatView(). Finally restricted
+ * by bounds of DSLV.
+ */
+ private Point mFloatLoc = new Point();
+
+ private Point mTouchLoc = new Point();
+
+ /**
+ * The middle (in the y-direction) of the floating View.
+ */
+ private int mFloatViewMid;
+
+ /**
+ * Flag to make sure float View isn't measured twice
+ */
+ private boolean mFloatViewOnMeasured = false;
+
+ /**
+ * Watch the Adapter for data changes. Cancel a drag if
+ * coincident with a change.
+ */
+ private DataSetObserver mObserver;
+
+ /**
+ * Transparency for the floating View (XML attribute).
+ */
+ private float mFloatAlpha = 1.0f;
+ private float mCurrFloatAlpha = 1.0f;
+
+ /**
+ * While drag-sorting, the current position of the floating
+ * View. If dropped, the dragged item will land in this position.
+ */
+ private int mFloatPos;
+
+ /**
+ * The first expanded ListView position that helps represent
+ * the drop slot tracking the floating View.
+ */
+ private int mFirstExpPos;
+
+ /**
+ * The second expanded ListView position that helps represent
+ * the drop slot tracking the floating View. This can equal
+ * mFirstExpPos if there is no slide shuffle occurring; otherwise
+ * it is equal to mFirstExpPos + 1.
+ */
+ private int mSecondExpPos;
+
+ /**
+ * Flag set if slide shuffling is enabled.
+ */
+ private boolean mAnimate = false;
+
+ /**
+ * The user dragged from this position.
+ */
+ private int mSrcPos;
+
+ /**
+ * Offset (in x) within the dragged item at which the user
+ * picked it up (or first touched down with the digitalis).
+ */
+ private int mDragDeltaX;
+
+ /**
+ * Offset (in y) within the dragged item at which the user
+ * picked it up (or first touched down with the digitalis).
+ */
+ private int mDragDeltaY;
+
+
+ /**
+ * The difference (in x) between screen coordinates and coordinates
+ * in this view.
+ */
+ private int mOffsetX;
+
+ /**
+ * The difference (in y) between screen coordinates and coordinates
+ * in this view.
+ */
+ private int mOffsetY;
+
+ /**
+ * A listener that receives callbacks whenever the floating View
+ * hovers over a new position.
+ */
+ private DragListener mDragListener;
+
+ /**
+ * A listener that receives a callback when the floating View
+ * is dropped.
+ */
+ private DropListener mDropListener;
+
+ /**
+ * A listener that receives a callback when the floating View
+ * (or more precisely the originally dragged item) is removed
+ * by one of the provided gestures.
+ */
+ private RemoveListener mRemoveListener;
+
+ /**
+ * Enable/Disable item dragging
+ *
+ * @attr name dslv:drag_enabled
+ */
+ private boolean mDragEnabled = true;
+
+ /**
+ * Drag state enum.
+ */
+ private final static int IDLE = 0;
+ private final static int REMOVING = 1;
+ private final static int DROPPING = 2;
+ private final static int STOPPED = 3;
+ private final static int DRAGGING = 4;
+
+ private int mDragState = IDLE;
+
+ /**
+ * Height in pixels to which the originally dragged item
+ * is collapsed during a drag-sort. Currently, this value
+ * must be greater than zero.
+ */
+ private int mItemHeightCollapsed = 1;
+
+ /**
+ * Height of the floating View. Stored for the purpose of
+ * providing the tracking drop slot.
+ */
+ private int mFloatViewHeight;
+
+ /**
+ * Convenience member. See above.
+ */
+ private int mFloatViewHeightHalf;
+
+ /**
+ * Save the given width spec for use in measuring children
+ */
+ private int mWidthMeasureSpec = 0;
+
+ /**
+ * Sample Views ultimately used for calculating the height
+ * of ListView items that are off-screen.
+ */
+ private View[] mSampleViewTypes = new View[1];
+
+ /**
+ * Drag-scroll encapsulator!
+ */
+ private DragScroller mDragScroller;
+
+ /**
+ * Determines the start of the upward drag-scroll region
+ * at the top of the ListView. Specified by a fraction
+ * of the ListView height, thus screen resolution agnostic.
+ */
+ private float mDragUpScrollStartFrac = 1.0f / 3.0f;
+
+ /**
+ * Determines the start of the downward drag-scroll region
+ * at the bottom of the ListView. Specified by a fraction
+ * of the ListView height, thus screen resolution agnostic.
+ */
+ private float mDragDownScrollStartFrac = 1.0f / 3.0f;
+
+ /**
+ * The following are calculated from the above fracs.
+ */
+ private int mUpScrollStartY;
+ private int mDownScrollStartY;
+ private float mDownScrollStartYF;
+ private float mUpScrollStartYF;
+
+ /**
+ * Calculated from above above and current ListView height.
+ */
+ private float mDragUpScrollHeight;
+
+ /**
+ * Calculated from above above and current ListView height.
+ */
+ private float mDragDownScrollHeight;
+
+ /**
+ * Maximum drag-scroll speed in pixels per ms. Only used with
+ * default linear drag-scroll profile.
+ */
+ private float mMaxScrollSpeed = 0.5f;
+
+ /**
+ * Defines the scroll speed during a drag-scroll. User can
+ * provide their own; this default is a simple linear profile
+ * where scroll speed increases linearly as the floating View
+ * nears the top/bottom of the ListView.
+ */
+ private DragScrollProfile mScrollProfile = new DragScrollProfile() {
+ @Override
+ public float getSpeed(float w, long t) {
+ return mMaxScrollSpeed * w;
+ }
+ };
+
+ /**
+ * Current touch x.
+ */
+ private int mX;
+
+ /**
+ * Current touch y.
+ */
+ private int mY;
+
+ /**
+ * Last touch x.
+ */
+ private int mLastX;
+
+ /**
+ * Last touch y.
+ */
+ private int mLastY;
+
+ /**
+ * The touch y-coord at which drag started
+ */
+ private int mDragStartY;
+
+ /**
+ * Drag flag bit. Floating View can move in the positive
+ * x direction.
+ */
+ public final static int DRAG_POS_X = 0x1;
+
+ /**
+ * Drag flag bit. Floating View can move in the negative
+ * x direction.
+ */
+ public final static int DRAG_NEG_X = 0x2;
+
+ /**
+ * Drag flag bit. Floating View can move in the positive
+ * y direction. This is subtle. What this actually means is
+ * that, if enabled, the floating View can be dragged below its starting
+ * position. Remove in favor of upper-bounding item position?
+ */
+ public final static int DRAG_POS_Y = 0x4;
+
+ /**
+ * Drag flag bit. Floating View can move in the negative
+ * y direction. This is subtle. What this actually means is
+ * that the floating View can be dragged above its starting
+ * position. Remove in favor of lower-bounding item position?
+ */
+ public final static int DRAG_NEG_Y = 0x8;
+
+ /**
+ * Flags that determine limits on the motion of the
+ * floating View. See flags above.
+ */
+ private int mDragFlags = 0;
+
+ /**
+ * Last call to an on*TouchEvent was a call to
+ * onInterceptTouchEvent.
+ */
+ private boolean mLastCallWasIntercept = false;
+
+ /**
+ * A touch event is in progress.
+ */
+ private boolean mInTouchEvent = false;
+
+ /**
+ * Let the user customize the floating View.
+ */
+ private FloatViewManager mFloatViewManager = null;
+
+ /**
+ * Given to ListView to cancel its action when a drag-sort
+ * begins.
+ */
+ private MotionEvent mCancelEvent;
+
+ /**
+ * Enum telling where to cancel the ListView action when a
+ * drag-sort begins
+ */
+ private static final int NO_CANCEL = 0;
+ private static final int ON_TOUCH_EVENT = 1;
+ private static final int ON_INTERCEPT_TOUCH_EVENT = 2;
+
+ /**
+ * Where to cancel the ListView action when a
+ * drag-sort begins
+ */
+ private int mCancelMethod = NO_CANCEL;
+
+ /**
+ * Determines when a slide shuffle animation starts. That is,
+ * defines how close to the edge of the drop slot the floating
+ * View must be to initiate the slide.
+ */
+ private float mSlideRegionFrac = 0.25f;
+
+ /**
+ * Number between 0 and 1 indicating the relative location of
+ * a sliding item (only used if drag-sort animations
+ * are turned on). Nearly 1 means the item is
+ * at the top of the slide region (nearly full blank item
+ * is directly below).
+ */
+ private float mSlideFrac = 0.0f;
+
+ /**
+ * Wraps the user-provided ListAdapter. This is used to wrap each
+ * item View given by the user inside another View (currenly
+ * a RelativeLayout) which
+ * expands and collapses to simulate the item shuffling.
+ */
+ private AdapterWrapper mAdapterWrapper;
+
+ /**
+ * Turn on custom debugger.
+ */
+ private boolean mTrackDragSort = false;
+
+ /**
+ * Debugging class.
+ */
+ private DragSortTracker mDragSortTracker;
+
+ /**
+ * Needed for adjusting item heights from within layoutChildren
+ */
+ private boolean mBlockLayoutRequests = false;
+
+ /**
+ * Set to true when a down event happens during drag sort;
+ * for example, when drag finish animations are
+ * playing.
+ */
+ private boolean mIgnoreTouchEvent = false;
+
+ /**
+ * Caches DragSortItemView child heights. Sometimes DSLV has to
+ * know the height of an offscreen item. Since ListView virtualizes
+ * these, DSLV must get the item from the ListAdapter to obtain
+ * its height. That process can be expensive, but often the same
+ * offscreen item will be requested many times in a row. Once an
+ * offscreen item height is calculated, we cache it in this guy.
+ * Actually, we cache the height of the child of the
+ * DragSortItemView since the item height changes often during a
+ * drag-sort.
+ */
+ private static final int sCacheSize = 3;
+ private HeightCache mChildHeightCache = new HeightCache(sCacheSize);
+
+ private RemoveAnimator mRemoveAnimator;
+
+ private LiftAnimator mLiftAnimator;
+
+ private DropAnimator mDropAnimator;
+
+ private boolean mUseRemoveVelocity;
+ private float mRemoveVelocityX = 0;
+
+ public DragSortListView(Context context, AttributeSet attrs) {
+ super(context, attrs);
+
+ int defaultDuration = 150;
+ int removeAnimDuration = defaultDuration; // ms
+ int dropAnimDuration = defaultDuration; // ms
+
+ if (attrs != null) {
+ TypedArray a = getContext().obtainStyledAttributes(attrs,
+ R.styleable.DragSortListView, 0, 0);
+
+ mItemHeightCollapsed = Math.max(1, a.getDimensionPixelSize(
+ R.styleable.DragSortListView_collapsedHeight, 1));
+
+ mTrackDragSort = a.getBoolean(
+ R.styleable.DragSortListView_trackDragSort, false);
+
+ if (mTrackDragSort) {
+ mDragSortTracker = new DragSortTracker();
+ }
+
+ // alpha between 0 and 255, 0=transparent, 255=opaque
+ mFloatAlpha = a.getFloat(R.styleable.DragSortListView_floatAlpha, mFloatAlpha);
+ mCurrFloatAlpha = mFloatAlpha;
+
+ mDragEnabled = a.getBoolean(R.styleable.DragSortListView_dragEnabled, mDragEnabled);
+
+ mSlideRegionFrac = Math.max(0.0f,
+ Math.min(1.0f, 1.0f - a.getFloat(
+ R.styleable.DragSortListView_slideShuffleSpeed,
+ 0.75f)));
+
+ mAnimate = mSlideRegionFrac > 0.0f;
+
+ float frac = a.getFloat(
+ R.styleable.DragSortListView_dragScrollStart,
+ mDragUpScrollStartFrac);
+
+ setDragScrollStart(frac);
+
+ mMaxScrollSpeed = a.getFloat(
+ R.styleable.DragSortListView_maxDragScrollSpeed,
+ mMaxScrollSpeed);
+
+ removeAnimDuration = a.getInt(
+ R.styleable.DragSortListView_removeAnimationDuration,
+ removeAnimDuration);
+
+ dropAnimDuration = a.getInt(
+ R.styleable.DragSortListView_dropAnimationDuration,
+ dropAnimDuration);
+
+ boolean useDefault = a.getBoolean(
+ R.styleable.DragSortListView_useDefaultController,
+ true);
+
+ if (useDefault) {
+ boolean removeEnabled = a.getBoolean(
+ R.styleable.DragSortListView_removeEnabled,
+ false);
+ int removeMode = a.getInt(
+ R.styleable.DragSortListView_removeMode,
+ DragSortController.FLING_REMOVE);
+ boolean sortEnabled = a.getBoolean(
+ R.styleable.DragSortListView_sortEnabled,
+ true);
+ int dragInitMode = a.getInt(
+ R.styleable.DragSortListView_dragStartMode,
+ DragSortController.ON_DOWN);
+ int dragHandleId = a.getResourceId(
+ R.styleable.DragSortListView_dragHandleId,
+ 0);
+ int flingHandleId = a.getResourceId(
+ R.styleable.DragSortListView_flingHandleId,
+ 0);
+ int clickRemoveId = a.getResourceId(
+ R.styleable.DragSortListView_clickRemoveId,
+ 0);
+ int bgColor = a.getColor(
+ R.styleable.DragSortListView_floatBackgroundColor,
+ Color.BLACK);
+
+ DragSortController controller = new DragSortController(
+ this, dragHandleId, dragInitMode, removeMode,
+ clickRemoveId, flingHandleId);
+ controller.setRemoveEnabled(removeEnabled);
+ controller.setSortEnabled(sortEnabled);
+ controller.setBackgroundColor(bgColor);
+
+ mFloatViewManager = controller;
+ setOnTouchListener(controller);
+ }
+
+ a.recycle();
+ }
+
+ mDragScroller = new DragScroller();
+
+ float smoothness = 0.5f;
+ if (removeAnimDuration > 0) {
+ mRemoveAnimator = new RemoveAnimator(smoothness, removeAnimDuration);
+ }
+ // mLiftAnimator = new LiftAnimator(smoothness, 100);
+ if (dropAnimDuration > 0) {
+ mDropAnimator = new DropAnimator(smoothness, dropAnimDuration);
+ }
+
+ mCancelEvent = MotionEvent.obtain(0, 0, MotionEvent.ACTION_CANCEL, 0f, 0f, 0f, 0f, 0, 0f,
+ 0f, 0, 0);
+
+ // construct the dataset observer
+ mObserver = new DataSetObserver() {
+ private void cancel() {
+ if (mDragState == DRAGGING) {
+ cancelDrag();
+ }
+ }
+
+ @Override
+ public void onChanged() {
+ cancel();
+ }
+
+ @Override
+ public void onInvalidated() {
+ cancel();
+ }
+ };
+ }
+
+ /**
+ * Usually called from a FloatViewManager. The float alpha
+ * will be reset to the xml-defined value every time a drag
+ * is stopped.
+ */
+ public void setFloatAlpha(float alpha) {
+ mCurrFloatAlpha = alpha;
+ }
+
+ public float getFloatAlpha() {
+ return mCurrFloatAlpha;
+ }
+
+ /**
+ * Set maximum drag scroll speed in positions/second. Only applies
+ * if using default ScrollSpeedProfile.
+ *
+ * @param max Maximum scroll speed.
+ */
+ public void setMaxScrollSpeed(float max) {
+ mMaxScrollSpeed = max;
+ }
+
+ /**
+ * For each DragSortListView Listener interface implemented by
+ * adapter, this method calls the appropriate
+ * set*Listener method with adapter as the argument.
+ *
+ * @param adapter The ListAdapter providing data to back
+ * DragSortListView.
+ *
+ * @see android.widget.ListView#setAdapter(android.widget.ListAdapter)
+ */
+ @Override
+ public void setAdapter(ListAdapter adapter) {
+ if (adapter != null) {
+ mAdapterWrapper = new AdapterWrapper(adapter);
+ adapter.registerDataSetObserver(mObserver);
+
+ if (adapter instanceof DropListener) {
+ setDropListener((DropListener) adapter);
+ }
+ if (adapter instanceof DragListener) {
+ setDragListener((DragListener) adapter);
+ }
+ if (adapter instanceof RemoveListener) {
+ setRemoveListener((RemoveListener) adapter);
+ }
+ } else {
+ mAdapterWrapper = null;
+ }
+
+ super.setAdapter(mAdapterWrapper);
+ }
+
+ /**
+ * As opposed to {@link ListView#getAdapter()}, which returns
+ * a heavily wrapped ListAdapter (DragSortListView wraps the
+ * input ListAdapter {\emph and} ListView wraps the wrapped one).
+ *
+ * @return The ListAdapter set as the argument of {@link setAdapter()}
+ */
+ public ListAdapter getInputAdapter() {
+ if (mAdapterWrapper == null) {
+ return null;
+ } else {
+ return mAdapterWrapper.getAdapter();
+ }
+ }
+
+ private class AdapterWrapper extends BaseAdapter {
+ private ListAdapter mAdapter;
+
+ public AdapterWrapper(ListAdapter adapter) {
+ super();
+ mAdapter = adapter;
+
+ mAdapter.registerDataSetObserver(new DataSetObserver() {
+ public void onChanged() {
+ notifyDataSetChanged();
+ }
+
+ public void onInvalidated() {
+ notifyDataSetInvalidated();
+ }
+ });
+ }
+
+ public ListAdapter getAdapter() {
+ return mAdapter;
+ }
+
+ @Override
+ public long getItemId(int position) {
+ return mAdapter.getItemId(position);
+ }
+
+ @Override
+ public Object getItem(int position) {
+ return mAdapter.getItem(position);
+ }
+
+ @Override
+ public int getCount() {
+ return mAdapter.getCount();
+ }
+
+ @Override
+ public boolean areAllItemsEnabled() {
+ return mAdapter.areAllItemsEnabled();
+ }
+
+ @Override
+ public boolean isEnabled(int position) {
+ return mAdapter.isEnabled(position);
+ }
+
+ @Override
+ public int getItemViewType(int position) {
+ return mAdapter.getItemViewType(position);
+ }
+
+ @Override
+ public int getViewTypeCount() {
+ return mAdapter.getViewTypeCount();
+ }
+
+ @Override
+ public boolean hasStableIds() {
+ return mAdapter.hasStableIds();
+ }
+
+ @Override
+ public boolean isEmpty() {
+ return mAdapter.isEmpty();
+ }
+
+
+ @Override
+ public View getView(int position, View convertView, ViewGroup parent) {
+
+ DragSortItemView v;
+ View child;
+ // Log.d("mobeta",
+ // "getView: position="+position+" convertView="+convertView);
+ if (convertView != null) {
+ v = (DragSortItemView) convertView;
+ View oldChild = v.getChildAt(0);
+
+ child = mAdapter.getView(position, oldChild, DragSortListView.this);
+ if (child != oldChild) {
+ // shouldn't get here if user is reusing convertViews
+ // properly
+ if (oldChild != null) {
+ v.removeViewAt(0);
+ }
+ v.addView(child);
+ }
+ } else {
+ child = mAdapter.getView(position, null, DragSortListView.this);
+ v = new DragSortItemView(getContext());
+ v.setLayoutParams(new AbsListView.LayoutParams(
+ ViewGroup.LayoutParams.FILL_PARENT,
+ ViewGroup.LayoutParams.WRAP_CONTENT));
+ v.addView(child);
+ }
+
+ // Set the correct item height given drag state; passed
+ // View needs to be measured if measurement is required.
+ adjustItem(position + getHeaderViewsCount(), v, true);
+
+ return v;
+ }
+ }
+
+ private void drawDivider(int expPosition, Canvas canvas) {
+
+ final Drawable divider = getDivider();
+ final int dividerHeight = getDividerHeight();
+ // Log.d("mobeta", "div="+divider+" divH="+dividerHeight);
+
+ if (divider != null && dividerHeight != 0) {
+ final ViewGroup expItem = (ViewGroup) getChildAt(expPosition
+ - getFirstVisiblePosition());
+ if (expItem != null) {
+ final int l = getPaddingLeft();
+ final int r = getWidth() - getPaddingRight();
+ final int t;
+ final int b;
+
+ final int childHeight = expItem.getChildAt(0).getHeight();
+
+ if (expPosition > mSrcPos) {
+ t = expItem.getTop() + childHeight;
+ b = t + dividerHeight;
+ } else {
+ b = expItem.getBottom() - childHeight;
+ t = b - dividerHeight;
+ }
+ // Log.d("mobeta", "l="+l+" t="+t+" r="+r+" b="+b);
+
+ // Have to clip to support ColorDrawable on <= Gingerbread
+ canvas.save();
+ canvas.clipRect(l, t, r, b);
+ divider.setBounds(l, t, r, b);
+ divider.draw(canvas);
+ canvas.restore();
+ }
+ }
+ }
+
+ @Override
+ protected void dispatchDraw(Canvas canvas) {
+ super.dispatchDraw(canvas);
+
+ if (mDragState != IDLE) {
+ // draw the divider over the expanded item
+ if (mFirstExpPos != mSrcPos) {
+ drawDivider(mFirstExpPos, canvas);
+ }
+ if (mSecondExpPos != mFirstExpPos && mSecondExpPos != mSrcPos) {
+ drawDivider(mSecondExpPos, canvas);
+ }
+ }
+
+ if (mFloatView != null) {
+ // draw the float view over everything
+ final int w = mFloatView.getWidth();
+ final int h = mFloatView.getHeight();
+
+ int x = mFloatLoc.x;
+
+ int width = getWidth();
+ if (x < 0)
+ x = -x;
+ float alphaMod;
+ if (x < width) {
+ alphaMod = ((float) (width - x)) / ((float) width);
+ alphaMod *= alphaMod;
+ } else {
+ alphaMod = 0;
+ }
+
+ final int alpha = (int) (255f * mCurrFloatAlpha * alphaMod);
+
+ canvas.save();
+ // Log.d("mobeta", "clip rect bounds: " + canvas.getClipBounds());
+ canvas.translate(mFloatLoc.x, mFloatLoc.y);
+ canvas.clipRect(0, 0, w, h);
+
+ // Log.d("mobeta", "clip rect bounds: " + canvas.getClipBounds());
+ canvas.saveLayerAlpha(0, 0, w, h, alpha, Canvas.ALL_SAVE_FLAG);
+ mFloatView.draw(canvas);
+ canvas.restore();
+ canvas.restore();
+ }
+ }
+
+ private int getItemHeight(int position) {
+ View v = getChildAt(position - getFirstVisiblePosition());
+
+ if (v != null) {
+ // item is onscreen, just get the height of the View
+ return v.getHeight();
+ } else {
+ // item is offscreen. get child height and calculate
+ // item height based on current shuffle state
+ return calcItemHeight(position, getChildHeight(position));
+ }
+ }
+
+ private void printPosData() {
+ Log.d("mobeta", "mSrcPos=" + mSrcPos + " mFirstExpPos=" + mFirstExpPos + " mSecondExpPos="
+ + mSecondExpPos);
+ }
+
+ private class HeightCache {
+
+ private SparseIntArray mMap;
+ private ArrayListtrue as the first argument.
+ */
+ public void cancelDrag() {
+ if (mDragState == DRAGGING) {
+ mDragScroller.stopScrolling(true);
+ destroyFloatView();
+ clearPositions();
+ adjustAllItems();
+
+ if (mInTouchEvent) {
+ mDragState = STOPPED;
+ } else {
+ mDragState = IDLE;
+ }
+ }
+ }
+
+ private void clearPositions() {
+ mSrcPos = -1;
+ mFirstExpPos = -1;
+ mSecondExpPos = -1;
+ mFloatPos = -1;
+ }
+
+ private void dropFloatView() {
+ // must set to avoid cancelDrag being called from the
+ // DataSetObserver
+ mDragState = DROPPING;
+
+ if (mDropListener != null && mFloatPos >= 0 && mFloatPos < getCount()) {
+ final int numHeaders = getHeaderViewsCount();
+ mDropListener.drop(mSrcPos - numHeaders, mFloatPos - numHeaders);
+ }
+
+ destroyFloatView();
+
+ adjustOnReorder();
+ clearPositions();
+ adjustAllItems();
+
+ // now the drag is done
+ if (mInTouchEvent) {
+ mDragState = STOPPED;
+ } else {
+ mDragState = IDLE;
+ }
+ }
+
+ private void doRemoveItem() {
+ doRemoveItem(mSrcPos - getHeaderViewsCount());
+ }
+
+ /**
+ * Removes dragged item from the list. Calls RemoveListener.
+ */
+ private void doRemoveItem(int which) {
+ // must set to avoid cancelDrag being called from the
+ // DataSetObserver
+ mDragState = REMOVING;
+
+ // end it
+ if (mRemoveListener != null) {
+ mRemoveListener.remove(which);
+ }
+
+ destroyFloatView();
+
+ adjustOnReorder();
+ clearPositions();
+
+ // now the drag is done
+ if (mInTouchEvent) {
+ mDragState = STOPPED;
+ } else {
+ mDragState = IDLE;
+ }
+ }
+
+ private void adjustOnReorder() {
+ final int firstPos = getFirstVisiblePosition();
+ // Log.d("mobeta", "first="+firstPos+" src="+mSrcPos);
+ if (mSrcPos < firstPos) {
+ // collapsed src item is off screen;
+ // adjust the scroll after item heights have been fixed
+ View v = getChildAt(0);
+ int top = 0;
+ if (v != null) {
+ top = v.getTop();
+ }
+ // Log.d("mobeta", "top="+top+" fvh="+mFloatViewHeight);
+ setSelectionFromTop(firstPos - 1, top - getPaddingTop());
+ }
+ }
+
+ /**
+ * Stop a drag in progress. Pass true if you would
+ * like to remove the dragged item from the list.
+ *
+ * @param remove Remove the dragged item from the list. Calls
+ * a registered RemoveListener, if one exists. Otherwise, calls
+ * the DropListener, if one exists.
+ *
+ * @return True if the stop was successful. False if there is
+ * no floating View.
+ */
+ public boolean stopDrag(boolean remove) {
+ mUseRemoveVelocity = false;
+ return stopDrag(remove, 0);
+ }
+
+ public boolean stopDragWithVelocity(boolean remove, float velocityX) {
+
+ mUseRemoveVelocity = true;
+ return stopDrag(remove, velocityX);
+ }
+
+ public boolean stopDrag(boolean remove, float velocityX) {
+ if (mFloatView != null) {
+ mDragScroller.stopScrolling(true);
+
+ if (remove) {
+ removeItem(mSrcPos - getHeaderViewsCount(), velocityX);
+ } else {
+ if (mDropAnimator != null) {
+ mDropAnimator.start();
+ } else {
+ dropFloatView();
+ }
+ }
+
+ if (mTrackDragSort) {
+ mDragSortTracker.stopTracking();
+ }
+
+ return true;
+ } else {
+ // stop failed
+ return false;
+ }
+ }
+
+ @Override
+ public boolean onTouchEvent(MotionEvent ev) {
+ if (mIgnoreTouchEvent) {
+ mIgnoreTouchEvent = false;
+ return false;
+ }
+
+ if (!mDragEnabled) {
+ return super.onTouchEvent(ev);
+ }
+
+ boolean more = false;
+
+ boolean lastCallWasIntercept = mLastCallWasIntercept;
+ mLastCallWasIntercept = false;
+
+ if (!lastCallWasIntercept) {
+ saveTouchCoords(ev);
+ }
+
+ // if (mFloatView != null) {
+ if (mDragState == DRAGGING) {
+ onDragTouchEvent(ev);
+ more = true; // give us more!
+ } else {
+ // what if float view is null b/c we dropped in middle
+ // of drag touch event?
+
+ // if (mDragState != STOPPED) {
+ if (mDragState == IDLE) {
+ if (super.onTouchEvent(ev)) {
+ more = true;
+ }
+ }
+
+ int action = ev.getAction() & MotionEvent.ACTION_MASK;
+
+ switch (action) {
+ case MotionEvent.ACTION_CANCEL:
+ case MotionEvent.ACTION_UP:
+ doActionUpOrCancel();
+ break;
+ default:
+ if (more) {
+ mCancelMethod = ON_TOUCH_EVENT;
+ }
+ }
+ }
+
+ return more;
+ }
+
+ private void doActionUpOrCancel() {
+ mCancelMethod = NO_CANCEL;
+ mInTouchEvent = false;
+ if (mDragState == STOPPED) {
+ mDragState = IDLE;
+ }
+ mCurrFloatAlpha = mFloatAlpha;
+ mListViewIntercepted = false;
+ mChildHeightCache.clear();
+ }
+
+ private void saveTouchCoords(MotionEvent ev) {
+ int action = ev.getAction() & MotionEvent.ACTION_MASK;
+ if (action != MotionEvent.ACTION_DOWN) {
+ mLastX = mX;
+ mLastY = mY;
+ }
+ mX = (int) ev.getX();
+ mY = (int) ev.getY();
+ if (action == MotionEvent.ACTION_DOWN) {
+ mLastX = mX;
+ mLastY = mY;
+ }
+ mOffsetX = (int) ev.getRawX() - mX;
+ mOffsetY = (int) ev.getRawY() - mY;
+ }
+
+ public boolean listViewIntercepted() {
+ return mListViewIntercepted;
+ }
+
+ private boolean mListViewIntercepted = false;
+
+ @Override
+ public boolean onInterceptTouchEvent(MotionEvent ev) {
+ if (!mDragEnabled) {
+ return super.onInterceptTouchEvent(ev);
+ }
+
+ saveTouchCoords(ev);
+ mLastCallWasIntercept = true;
+
+ int action = ev.getAction() & MotionEvent.ACTION_MASK;
+
+ if (action == MotionEvent.ACTION_DOWN) {
+ if (mDragState != IDLE) {
+ // intercept and ignore
+ mIgnoreTouchEvent = true;
+ return true;
+ }
+ mInTouchEvent = true;
+ }
+
+ boolean intercept = false;
+
+ // the following deals with calls to super.onInterceptTouchEvent
+ if (mFloatView != null) {
+ // super's touch event canceled in startDrag
+ intercept = true;
+ } else {
+ if (super.onInterceptTouchEvent(ev)) {
+ mListViewIntercepted = true;
+ intercept = true;
+ }
+
+ switch (action) {
+ case MotionEvent.ACTION_CANCEL:
+ case MotionEvent.ACTION_UP:
+ doActionUpOrCancel();
+ break;
+ default:
+ if (intercept) {
+ mCancelMethod = ON_TOUCH_EVENT;
+ } else {
+ mCancelMethod = ON_INTERCEPT_TOUCH_EVENT;
+ }
+ }
+ }
+
+ if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) {
+ mInTouchEvent = false;
+ }
+
+ return intercept;
+ }
+
+ /**
+ * Set the width of each drag scroll region by specifying
+ * a fraction of the ListView height.
+ *
+ * @param heightFraction Fraction of ListView height. Capped at
+ * 0.5f.
+ *
+ */
+ public void setDragScrollStart(float heightFraction) {
+ setDragScrollStarts(heightFraction, heightFraction);
+ }
+
+ /**
+ * Set the width of each drag scroll region by specifying
+ * a fraction of the ListView height.
+ *
+ * @param upperFrac Fraction of ListView height for up-scroll bound.
+ * Capped at 0.5f.
+ * @param lowerFrac Fraction of ListView height for down-scroll bound.
+ * Capped at 0.5f.
+ *
+ */
+ public void setDragScrollStarts(float upperFrac, float lowerFrac) {
+ if (lowerFrac > 0.5f) {
+ mDragDownScrollStartFrac = 0.5f;
+ } else {
+ mDragDownScrollStartFrac = lowerFrac;
+ }
+
+ if (upperFrac > 0.5f) {
+ mDragUpScrollStartFrac = 0.5f;
+ } else {
+ mDragUpScrollStartFrac = upperFrac;
+ }
+
+ if (getHeight() != 0) {
+ updateScrollStarts();
+ }
+ }
+
+ private void continueDrag(int x, int y) {
+
+ // proposed position
+ mFloatLoc.x = x - mDragDeltaX;
+ mFloatLoc.y = y - mDragDeltaY;
+
+ doDragFloatView(true);
+
+ int minY = Math.min(y, mFloatViewMid + mFloatViewHeightHalf);
+ int maxY = Math.max(y, mFloatViewMid - mFloatViewHeightHalf);
+
+ // get the current scroll direction
+ int currentScrollDir = mDragScroller.getScrollDir();
+
+ if (minY > mLastY && minY > mDownScrollStartY && currentScrollDir != DragScroller.DOWN) {
+ // dragged down, it is below the down scroll start and it is not
+ // scrolling up
+
+ if (currentScrollDir != DragScroller.STOP) {
+ // moved directly from up scroll to down scroll
+ mDragScroller.stopScrolling(true);
+ }
+
+ // start scrolling down
+ mDragScroller.startScrolling(DragScroller.DOWN);
+ } else if (maxY < mLastY && maxY < mUpScrollStartY && currentScrollDir != DragScroller.UP) {
+ // dragged up, it is above the up scroll start and it is not
+ // scrolling up
+
+ if (currentScrollDir != DragScroller.STOP) {
+ // moved directly from down scroll to up scroll
+ mDragScroller.stopScrolling(true);
+ }
+
+ // start scrolling up
+ mDragScroller.startScrolling(DragScroller.UP);
+ }
+ else if (maxY >= mUpScrollStartY && minY <= mDownScrollStartY
+ && mDragScroller.isScrolling()) {
+ // not in the upper nor in the lower drag-scroll regions but it is
+ // still scrolling
+
+ mDragScroller.stopScrolling(true);
+ }
+ }
+
+ private void updateScrollStarts() {
+ final int padTop = getPaddingTop();
+ final int listHeight = getHeight() - padTop - getPaddingBottom();
+ float heightF = (float) listHeight;
+
+ mUpScrollStartYF = padTop + mDragUpScrollStartFrac * heightF;
+ mDownScrollStartYF = padTop + (1.0f - mDragDownScrollStartFrac) * heightF;
+
+ mUpScrollStartY = (int) mUpScrollStartYF;
+ mDownScrollStartY = (int) mDownScrollStartYF;
+
+ mDragUpScrollHeight = mUpScrollStartYF - padTop;
+ mDragDownScrollHeight = padTop + listHeight - mDownScrollStartYF;
+ }
+
+ @Override
+ protected void onSizeChanged(int w, int h, int oldw, int oldh) {
+ super.onSizeChanged(w, h, oldw, oldh);
+ updateScrollStarts();
+ }
+
+ private void adjustAllItems() {
+ final int first = getFirstVisiblePosition();
+ final int last = getLastVisiblePosition();
+
+ int begin = Math.max(0, getHeaderViewsCount() - first);
+ int end = Math.min(last - first, getCount() - 1 - getFooterViewsCount() - first);
+
+ for (int i = begin; i <= end; ++i) {
+ View v = getChildAt(i);
+ if (v != null) {
+ adjustItem(first + i, v, false);
+ }
+ }
+ }
+
+ private void adjustItem(int position) {
+ View v = getChildAt(position - getFirstVisiblePosition());
+
+ if (v != null) {
+ adjustItem(position, v, false);
+ }
+ }
+
+ /**
+ * Sets layout param height, gravity, and visibility on
+ * wrapped item.
+ */
+ private void adjustItem(int position, View v, boolean invalidChildHeight) {
+
+ // Adjust item height
+ ViewGroup.LayoutParams lp = v.getLayoutParams();
+ int height;
+ if (position != mSrcPos && position != mFirstExpPos && position != mSecondExpPos) {
+ height = ViewGroup.LayoutParams.WRAP_CONTENT;
+ } else {
+ height = calcItemHeight(position, v, invalidChildHeight);
+ }
+
+ if (height != lp.height) {
+ lp.height = height;
+ v.setLayoutParams(lp);
+ }
+
+ // Adjust item gravity
+ if (position == mFirstExpPos || position == mSecondExpPos) {
+ if (position < mSrcPos) {
+ ((DragSortItemView) v).setGravity(Gravity.BOTTOM);
+ } else if (position > mSrcPos) {
+ ((DragSortItemView) v).setGravity(Gravity.TOP);
+ }
+ }
+
+ // Finally adjust item visibility
+
+ int oldVis = v.getVisibility();
+ int vis = View.VISIBLE;
+
+ if (position == mSrcPos && mFloatView != null) {
+ vis = View.INVISIBLE;
+ }
+
+ if (vis != oldVis) {
+ v.setVisibility(vis);
+ }
+ }
+
+ private int getChildHeight(int position) {
+ if (position == mSrcPos) {
+ return 0;
+ }
+
+ View v = getChildAt(position - getFirstVisiblePosition());
+
+ if (v != null) {
+ // item is onscreen, therefore child height is valid,
+ // hence the "true"
+ return getChildHeight(position, v, false);
+ } else {
+ // item is offscreen
+ // first check cache for child height at this position
+ int childHeight = mChildHeightCache.get(position);
+ if (childHeight != -1) {
+ // Log.d("mobeta", "found child height in cache!");
+ return childHeight;
+ }
+
+ final ListAdapter adapter = getAdapter();
+ int type = adapter.getItemViewType(position);
+
+ // There might be a better place for checking for the following
+ final int typeCount = adapter.getViewTypeCount();
+ if (typeCount != mSampleViewTypes.length) {
+ mSampleViewTypes = new View[typeCount];
+ }
+
+ if (type >= 0) {
+ if (mSampleViewTypes[type] == null) {
+ v = adapter.getView(position, null, this);
+ mSampleViewTypes[type] = v;
+ } else {
+ v = adapter.getView(position, mSampleViewTypes[type], this);
+ }
+ } else {
+ // type is HEADER_OR_FOOTER or IGNORE
+ v = adapter.getView(position, null, this);
+ }
+
+ // current child height is invalid, hence "true" below
+ childHeight = getChildHeight(position, v, true);
+
+ // cache it because this could have been expensive
+ mChildHeightCache.add(position, childHeight);
+
+ return childHeight;
+ }
+ }
+
+ private int getChildHeight(int position, View item, boolean invalidChildHeight) {
+ if (position == mSrcPos) {
+ return 0;
+ }
+
+ View child;
+ if (position < getHeaderViewsCount() || position >= getCount() - getFooterViewsCount()) {
+ child = item;
+ } else {
+ child = ((ViewGroup) item).getChildAt(0);
+ }
+
+ ViewGroup.LayoutParams lp = child.getLayoutParams();
+
+ if (lp != null) {
+ if (lp.height > 0) {
+ return lp.height;
+ }
+ }
+
+ int childHeight = child.getHeight();
+
+ if (childHeight == 0 || invalidChildHeight) {
+ measureItem(child);
+ childHeight = child.getMeasuredHeight();
+ }
+
+ return childHeight;
+ }
+
+ private int calcItemHeight(int position, View item, boolean invalidChildHeight) {
+ return calcItemHeight(position, getChildHeight(position, item, invalidChildHeight));
+ }
+
+ private int calcItemHeight(int position, int childHeight) {
+
+ int divHeight = getDividerHeight();
+
+ boolean isSliding = mAnimate && mFirstExpPos != mSecondExpPos;
+ int maxNonSrcBlankHeight = mFloatViewHeight - mItemHeightCollapsed;
+ int slideHeight = (int) (mSlideFrac * maxNonSrcBlankHeight);
+
+ int height;
+
+ if (position == mSrcPos) {
+ if (mSrcPos == mFirstExpPos) {
+ if (isSliding) {
+ height = slideHeight + mItemHeightCollapsed;
+ } else {
+ height = mFloatViewHeight;
+ }
+ } else if (mSrcPos == mSecondExpPos) {
+ // if gets here, we know an item is sliding
+ height = mFloatViewHeight - slideHeight;
+ } else {
+ height = mItemHeightCollapsed;
+ }
+ } else if (position == mFirstExpPos) {
+ if (isSliding) {
+ height = childHeight + slideHeight;
+ } else {
+ height = childHeight + maxNonSrcBlankHeight;
+ }
+ } else if (position == mSecondExpPos) {
+ // we know an item is sliding (b/c 2ndPos != 1stPos)
+ height = childHeight + maxNonSrcBlankHeight - slideHeight;
+ } else {
+ height = childHeight;
+ }
+
+ return height;
+ }
+
+ @Override
+ public void requestLayout() {
+ if (!mBlockLayoutRequests) {
+ super.requestLayout();
+ }
+ }
+
+ private int adjustScroll(int movePos, View moveItem, int oldFirstExpPos, int oldSecondExpPos) {
+ int adjust = 0;
+
+ final int childHeight = getChildHeight(movePos);
+
+ int moveHeightBefore = moveItem.getHeight();
+ int moveHeightAfter = calcItemHeight(movePos, childHeight);
+
+ int moveBlankBefore = moveHeightBefore;
+ int moveBlankAfter = moveHeightAfter;
+ if (movePos != mSrcPos) {
+ moveBlankBefore -= childHeight;
+ moveBlankAfter -= childHeight;
+ }
+
+ int maxBlank = mFloatViewHeight;
+ if (mSrcPos != mFirstExpPos && mSrcPos != mSecondExpPos) {
+ maxBlank -= mItemHeightCollapsed;
+ }
+
+ if (movePos <= oldFirstExpPos) {
+ if (movePos > mFirstExpPos) {
+ adjust += maxBlank - moveBlankAfter;
+ }
+ } else if (movePos == oldSecondExpPos) {
+ if (movePos <= mFirstExpPos) {
+ adjust += moveBlankBefore - maxBlank;
+ } else if (movePos == mSecondExpPos) {
+ adjust += moveHeightBefore - moveHeightAfter;
+ } else {
+ adjust += moveBlankBefore;
+ }
+ } else {
+ if (movePos <= mFirstExpPos) {
+ adjust -= maxBlank;
+ } else if (movePos == mSecondExpPos) {
+ adjust -= moveBlankAfter;
+ }
+ }
+
+ return adjust;
+ }
+
+ private void measureItem(View item) {
+ ViewGroup.LayoutParams lp = item.getLayoutParams();
+ if (lp == null) {
+ lp = new AbsListView.LayoutParams(
+ ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
+ item.setLayoutParams(lp);
+ }
+ int wspec = ViewGroup.getChildMeasureSpec(mWidthMeasureSpec, getListPaddingLeft()
+ + getListPaddingRight(), lp.width);
+ int hspec;
+ if (lp.height > 0) {
+ hspec = MeasureSpec.makeMeasureSpec(lp.height, MeasureSpec.EXACTLY);
+ } else {
+ hspec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
+ }
+ item.measure(wspec, hspec);
+ }
+
+ private void measureFloatView() {
+ if (mFloatView != null) {
+ measureItem(mFloatView);
+ mFloatViewHeight = mFloatView.getMeasuredHeight();
+ mFloatViewHeightHalf = mFloatViewHeight / 2;
+ }
+ }
+
+ @Override
+ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+ super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+ // Log.d("mobeta", "onMeasure called");
+ if (mFloatView != null) {
+ if (mFloatView.isLayoutRequested()) {
+ measureFloatView();
+ }
+ mFloatViewOnMeasured = true; // set to false after layout
+ }
+ mWidthMeasureSpec = widthMeasureSpec;
+ }
+
+ @Override
+ protected void layoutChildren() {
+ super.layoutChildren();
+
+ if (mFloatView != null) {
+ if (mFloatView.isLayoutRequested() && !mFloatViewOnMeasured) {
+ // Have to measure here when usual android measure
+ // pass is skipped. This happens during a drag-sort
+ // when layoutChildren is called directly.
+ measureFloatView();
+ }
+ mFloatView.layout(0, 0, mFloatView.getMeasuredWidth(), mFloatView.getMeasuredHeight());
+ mFloatViewOnMeasured = false;
+ }
+ }
+
+ protected boolean onDragTouchEvent(MotionEvent ev) {
+ // we are in a drag
+ int action = ev.getAction() & MotionEvent.ACTION_MASK;
+
+ switch (ev.getAction() & MotionEvent.ACTION_MASK) {
+ case MotionEvent.ACTION_CANCEL:
+ if (mDragState == DRAGGING) {
+ cancelDrag();
+ }
+ doActionUpOrCancel();
+ break;
+ case MotionEvent.ACTION_UP:
+ // Log.d("mobeta", "calling stopDrag from onDragTouchEvent");
+ if (mDragState == DRAGGING) {
+ stopDrag(false);
+ }
+ doActionUpOrCancel();
+ break;
+ case MotionEvent.ACTION_MOVE:
+ continueDrag((int) ev.getX(), (int) ev.getY());
+ break;
+ }
+
+ return true;
+ }
+
+ private boolean mFloatViewInvalidated = false;
+
+ private void invalidateFloatView() {
+ mFloatViewInvalidated = true;
+ }
+
+ /**
+ * Start a drag of item at position using the
+ * registered FloatViewManager. Calls through
+ * to {@link #startDrag(int,View,int,int,int)} after obtaining
+ * the floating View from the FloatViewManager.
+ *
+ * @param position Item to drag.
+ * @param dragFlags Flags that restrict some movements of the
+ * floating View. For example, set dragFlags |=
+ * ~{@link #DRAG_NEG_X} to allow dragging the floating
+ * View in all directions except off the screen to the left.
+ * @param deltaX Offset in x of the touch coordinate from the
+ * left edge of the floating View (i.e. touch-x minus float View
+ * left).
+ * @param deltaY Offset in y of the touch coordinate from the
+ * top edge of the floating View (i.e. touch-y minus float View
+ * top).
+ *
+ * @return True if the drag was started, false otherwise. This
+ * startDrag will fail if we are not currently in
+ * a touch event, there is no registered FloatViewManager,
+ * or the FloatViewManager returns a null View.
+ */
+ public boolean startDrag(int position, int dragFlags, int deltaX, int deltaY) {
+ if (!mInTouchEvent || mFloatViewManager == null) {
+ return false;
+ }
+
+ View v = mFloatViewManager.onCreateFloatView(position);
+
+ if (v == null) {
+ return false;
+ } else {
+ return startDrag(position, v, dragFlags, deltaX, deltaY);
+ }
+
+ }
+
+ /**
+ * Start a drag of item at position without using
+ * a FloatViewManager.
+ *
+ * @param position Item to drag.
+ * @param floatView Floating View.
+ * @param dragFlags Flags that restrict some movements of the
+ * floating View. For example, set dragFlags |=
+ * ~{@link #DRAG_NEG_X} to allow dragging the floating
+ * View in all directions except off the screen to the left.
+ * @param deltaX Offset in x of the touch coordinate from the
+ * left edge of the floating View (i.e. touch-x minus float View
+ * left).
+ * @param deltaY Offset in y of the touch coordinate from the
+ * top edge of the floating View (i.e. touch-y minus float View
+ * top).
+ *
+ * @return True if the drag was started, false otherwise. This
+ * startDrag will fail if we are not currently in
+ * a touch event, floatView is null, or there is
+ * a drag in progress.
+ */
+ public boolean startDrag(int position, View floatView, int dragFlags, int deltaX, int deltaY) {
+ if (mDragState != IDLE || !mInTouchEvent || mFloatView != null || floatView == null
+ || !mDragEnabled) {
+ return false;
+ }
+
+ if (getParent() != null) {
+ getParent().requestDisallowInterceptTouchEvent(true);
+ }
+
+ int pos = position + getHeaderViewsCount();
+ mFirstExpPos = pos;
+ mSecondExpPos = pos;
+ mSrcPos = pos;
+ mFloatPos = pos;
+
+ // mDragState = dragType;
+ mDragState = DRAGGING;
+ mDragFlags = 0;
+ mDragFlags |= dragFlags;
+
+ mFloatView = floatView;
+ measureFloatView(); // sets mFloatViewHeight
+
+ mDragDeltaX = deltaX;
+ mDragDeltaY = deltaY;
+ mDragStartY = mY;
+
+ // updateFloatView(mX - mDragDeltaX, mY - mDragDeltaY);
+ mFloatLoc.x = mX - mDragDeltaX;
+ mFloatLoc.y = mY - mDragDeltaY;
+
+ // set src item invisible
+ final View srcItem = getChildAt(mSrcPos - getFirstVisiblePosition());
+
+ if (srcItem != null) {
+ srcItem.setVisibility(View.INVISIBLE);
+ }
+
+ if (mTrackDragSort) {
+ mDragSortTracker.startTracking();
+ }
+
+ // once float view is created, events are no longer passed
+ // to ListView
+ switch (mCancelMethod) {
+ case ON_TOUCH_EVENT:
+ super.onTouchEvent(mCancelEvent);
+ break;
+ case ON_INTERCEPT_TOUCH_EVENT:
+ super.onInterceptTouchEvent(mCancelEvent);
+ break;
+ }
+
+ requestLayout();
+
+ if (mLiftAnimator != null) {
+ mLiftAnimator.start();
+ }
+
+ return true;
+ }
+
+ private void doDragFloatView(boolean forceInvalidate) {
+ int movePos = getFirstVisiblePosition() + getChildCount() / 2;
+ View moveItem = getChildAt(getChildCount() / 2);
+
+ if (moveItem == null) {
+ return;
+ }
+
+ doDragFloatView(movePos, moveItem, forceInvalidate);
+ }
+
+ private void doDragFloatView(int movePos, View moveItem, boolean forceInvalidate) {
+ mBlockLayoutRequests = true;
+
+ updateFloatView();
+
+ int oldFirstExpPos = mFirstExpPos;
+ int oldSecondExpPos = mSecondExpPos;
+
+ boolean updated = updatePositions();
+
+ if (updated) {
+ adjustAllItems();
+ int scroll = adjustScroll(movePos, moveItem, oldFirstExpPos, oldSecondExpPos);
+ // Log.d("mobeta", " adjust scroll="+scroll);
+
+ setSelectionFromTop(movePos, moveItem.getTop() + scroll - getPaddingTop());
+ layoutChildren();
+ }
+
+ if (updated || forceInvalidate) {
+ invalidate();
+ }
+
+ mBlockLayoutRequests = false;
+ }
+
+ /**
+ * Sets float View location based on suggested values and
+ * constraints set in mDragFlags.
+ */
+ private void updateFloatView() {
+
+ if (mFloatViewManager != null) {
+ mTouchLoc.set(mX, mY);
+ mFloatViewManager.onDragFloatView(mFloatView, mFloatLoc, mTouchLoc);
+ }
+
+ final int floatX = mFloatLoc.x;
+ final int floatY = mFloatLoc.y;
+
+ // restrict x motion
+ int padLeft = getPaddingLeft();
+ if ((mDragFlags & DRAG_POS_X) == 0 && floatX > padLeft) {
+ mFloatLoc.x = padLeft;
+ } else if ((mDragFlags & DRAG_NEG_X) == 0 && floatX < padLeft) {
+ mFloatLoc.x = padLeft;
+ }
+
+ // keep floating view from going past bottom of last header view
+ final int numHeaders = getHeaderViewsCount();
+ final int numFooters = getFooterViewsCount();
+ final int firstPos = getFirstVisiblePosition();
+ final int lastPos = getLastVisiblePosition();
+
+ // Log.d("mobeta",
+ // "nHead="+numHeaders+" nFoot="+numFooters+" first="+firstPos+" last="+lastPos);
+ int topLimit = getPaddingTop();
+ if (firstPos < numHeaders) {
+ topLimit = getChildAt(numHeaders - firstPos - 1).getBottom();
+ }
+ if ((mDragFlags & DRAG_NEG_Y) == 0) {
+ if (firstPos <= mSrcPos) {
+ topLimit = Math.max(getChildAt(mSrcPos - firstPos).getTop(), topLimit);
+ }
+ }
+ // bottom limit is top of first footer View or
+ // bottom of last item in list
+ int bottomLimit = getHeight() - getPaddingBottom();
+ if (lastPos >= getCount() - numFooters - 1) {
+ bottomLimit = getChildAt(getCount() - numFooters - 1 - firstPos).getBottom();
+ }
+ if ((mDragFlags & DRAG_POS_Y) == 0) {
+ if (lastPos >= mSrcPos) {
+ bottomLimit = Math.min(getChildAt(mSrcPos - firstPos).getBottom(), bottomLimit);
+ }
+ }
+
+ // Log.d("mobeta", "dragView top=" + (y - mDragDeltaY));
+ // Log.d("mobeta", "limit=" + limit);
+ // Log.d("mobeta", "mDragDeltaY=" + mDragDeltaY);
+
+ if (floatY < topLimit) {
+ mFloatLoc.y = topLimit;
+ } else if (floatY + mFloatViewHeight > bottomLimit) {
+ mFloatLoc.y = bottomLimit - mFloatViewHeight;
+ }
+
+ // get y-midpoint of floating view (constrained to ListView bounds)
+ mFloatViewMid = mFloatLoc.y + mFloatViewHeightHalf;
+ }
+
+ private void destroyFloatView() {
+ if (mFloatView != null) {
+ mFloatView.setVisibility(GONE);
+ if (mFloatViewManager != null) {
+ mFloatViewManager.onDestroyFloatView(mFloatView);
+ }
+ mFloatView = null;
+ invalidate();
+ }
+ }
+
+ /**
+ * Interface for customization of the floating View appearance
+ * and dragging behavior. Implement
+ * your own and pass it to {@link #setFloatViewManager}. If
+ * your own is not passed, the default {@link SimpleFloatViewManager}
+ * implementation is used.
+ */
+ public interface FloatViewManager {
+ /**
+ * Return the floating View for item at position.
+ * DragSortListView will measure and layout this View for you,
+ * so feel free to just inflate it. You can help DSLV by
+ * setting some {@link ViewGroup.LayoutParams} on this View;
+ * otherwise it will set some for you (with a width of FILL_PARENT
+ * and a height of WRAP_CONTENT).
+ *
+ * @param position Position of item to drag (NOTE:
+ * position excludes header Views; thus, if you
+ * want to call {@link ListView#getChildAt(int)}, you will need
+ * to add {@link ListView#getHeaderViewsCount()} to the index).
+ *
+ * @return The View you wish to display as the floating View.
+ */
+ public View onCreateFloatView(int position);
+
+ /**
+ * Called whenever the floating View is dragged. Float View
+ * properties can be changed here. Also, the upcoming location
+ * of the float View can be altered by setting
+ * location.x and location.y.
+ *
+ * @param floatView The floating View.
+ * @param location The location (top-left; relative to DSLV
+ * top-left) at which the float
+ * View would like to appear, given the current touch location
+ * and the offset provided in {@link DragSortListView#startDrag}.
+ * @param touch The current touch location (relative to DSLV
+ * top-left).
+ * @param pendingScroll
+ */
+ public void onDragFloatView(View floatView, Point location, Point touch);
+
+ /**
+ * Called when the float View is dropped; lets you perform
+ * any necessary cleanup. The internal DSLV floating View
+ * reference is set to null immediately after this is called.
+ *
+ * @param floatView The floating View passed to
+ * {@link #onCreateFloatView(int)}.
+ */
+ public void onDestroyFloatView(View floatView);
+ }
+
+ public void setFloatViewManager(FloatViewManager manager) {
+ mFloatViewManager = manager;
+ }
+
+ public void setDragListener(DragListener l) {
+ mDragListener = l;
+ }
+
+ /**
+ * Allows for easy toggling between a DragSortListView
+ * and a regular old ListView. If enabled, items are
+ * draggable, where the drag init mode determines how
+ * items are lifted (see {@link setDragInitMode(int)}).
+ * If disabled, items cannot be dragged.
+ *
+ * @param enabled Set true to enable list
+ * item dragging
+ */
+ public void setDragEnabled(boolean enabled) {
+ mDragEnabled = enabled;
+ }
+
+ public boolean isDragEnabled() {
+ return mDragEnabled;
+ }
+
+ /**
+ * This better reorder your ListAdapter! DragSortListView does not do this
+ * for you; doesn't make sense to. Make sure
+ * {@link BaseAdapter#notifyDataSetChanged()} or something like it is called
+ * in your implementation. Furthermore, if you have a choiceMode other than
+ * none and the ListAdapter does not return true for
+ * {@link ListAdapter#hasStableIds()}, you will need to call
+ * {@link #moveCheckState(int, int)} to move the check boxes along with the
+ * list items.
+ *
+ * @param l
+ */
+ public void setDropListener(DropListener l) {
+ mDropListener = l;
+ }
+
+ /**
+ * Probably a no-brainer, but make sure that your remove listener
+ * calls {@link BaseAdapter#notifyDataSetChanged()} or something like it.
+ * When an item removal occurs, DragSortListView
+ * relies on a redraw of all the items to recover invisible views
+ * and such. Strictly speaking, if you remove something, your dataset
+ * has changed...
+ *
+ * @param l
+ */
+ public void setRemoveListener(RemoveListener l) {
+ mRemoveListener = l;
+ }
+
+ public interface DragListener {
+ public void drag(int from, int to);
+ }
+
+ /**
+ * Your implementation of this has to reorder your ListAdapter!
+ * Make sure to call
+ * {@link BaseAdapter#notifyDataSetChanged()} or something like it
+ * in your implementation.
+ *
+ * @author heycosmo
+ *
+ */
+ public interface DropListener {
+ public void drop(int from, int to);
+ }
+
+ /**
+ * Make sure to call
+ * {@link BaseAdapter#notifyDataSetChanged()} or something like it
+ * in your implementation.
+ *
+ * @author heycosmo
+ *
+ */
+ public interface RemoveListener {
+ public void remove(int which);
+ }
+
+ public interface DragSortListener extends DropListener, DragListener, RemoveListener {
+ }
+
+ public void setDragSortListener(DragSortListener l) {
+ setDropListener(l);
+ setDragListener(l);
+ setRemoveListener(l);
+ }
+
+ /**
+ * Completely custom scroll speed profile. Default increases linearly
+ * with position and is constant in time. Create your own by implementing
+ * {@link DragSortListView.DragScrollProfile}.
+ *
+ * @param ssp
+ */
+ public void setDragScrollProfile(DragScrollProfile ssp) {
+ if (ssp != null) {
+ mScrollProfile = ssp;
+ }
+ }
+
+ /**
+ * Use this to move the check state of an item from one position to another
+ * in a drop operation. If you have a choiceMode which is not none, this
+ * method must be called when the order of items changes in an underlying
+ * adapter which does not have stable IDs (see
+ * {@link ListAdapter#hasStableIds()}). This is because without IDs, the
+ * ListView has no way of knowing which items have moved where, and cannot
+ * update the check state accordingly.
+ *
+ * A word of warning about a "feature" in Android that you may run into when
+ * dealing with movable list items: for an adapter that does have
+ * stable IDs, ListView will attempt to locate each item based on its ID and
+ * move the check state from the item's old position to the new position —
+ * which is all fine and good (and removes the need for calling this
+ * function), except for the half-baked approach. Apparently to save time in
+ * the naive algorithm used, ListView will only search for an ID in the
+ * close neighborhood of the old position. If the user moves an item too far
+ * (specifically, more than 20 rows away), ListView will give up and just
+ * force the item to be unchecked. So if there is a reasonable chance that
+ * the user will move items more than 20 rows away from the original
+ * position, you may wish to use an adapter with unstable IDs and call this
+ * method manually instead.
+ *
+ * @param from
+ * @param to
+ */
+ public void moveCheckState(int from, int to) {
+ // This method runs in O(n log n) time (n being the number of list
+ // items). The bottleneck is the call to AbsListView.setItemChecked,
+ // which is O(log n) because of the binary search involved in calling
+ // SparseBooleanArray.put().
+ //
+ // To improve on the average time, we minimize the number of calls to
+ // setItemChecked by only calling it for items that actually have a
+ // changed state. This is achieved by building a list containing the
+ // start and end of the "runs" of checked items, and then moving the
+ // runs. Note that moving an item from A to B is essentially a rotation
+ // of the range of items in [A, B]. Let's say we have
+ // . . U V X Y Z . .
+ // and move U after Z. This is equivalent to a rotation one step to the
+ // left within the range you are moving across:
+ // . . V X Y Z U . .
+ //
+ // So, to perform the move we enumerate all the runs within the move
+ // range, then rotate each run one step to the left or right (depending
+ // on move direction). For example, in the list:
+ // X X . X X X . X
+ // we have two runs. One begins at the last item of the list and wraps
+ // around to the beginning, ending at position 1. The second begins at
+ // position 3 and ends at position 5. To rotate a run, regardless of
+ // length, we only need to set a check mark at one end of the run, and
+ // clear a check mark at the other end:
+ // X . X X X . X X
+ SparseBooleanArray cip = getCheckedItemPositions();
+ int rangeStart = from;
+ int rangeEnd = to;
+ if (to < from) {
+ rangeStart = to;
+ rangeEnd = from;
+ }
+ rangeEnd += 1;
+
+ int[] runStart = new int[cip.size()];
+ int[] runEnd = new int[cip.size()];
+ int runCount = buildRunList(cip, rangeStart, rangeEnd, runStart, runEnd);
+ if (runCount == 1 && (runStart[0] == runEnd[0])) {
+ // Special case where all items are checked, we can never set any
+ // item to false like we do below.
+ return;
+ }
+
+ if (from < to) {
+ for (int i = 0; i != runCount; i++) {
+ setItemChecked(rotate(runStart[i], -1, rangeStart, rangeEnd), true);
+ setItemChecked(rotate(runEnd[i], -1, rangeStart, rangeEnd), false);
+ }
+
+ } else {
+ for (int i = 0; i != runCount; i++) {
+ setItemChecked(runStart[i], false);
+ setItemChecked(runEnd[i], true);
+ }
+ }
+ }
+
+ /**
+ * Use this when an item has been deleted, to move the check state of all
+ * following items up one step. If you have a choiceMode which is not none,
+ * this method must be called when the order of items changes in an
+ * underlying adapter which does not have stable IDs (see
+ * {@link ListAdapter#hasStableIds()}). This is because without IDs, the
+ * ListView has no way of knowing which items have moved where, and cannot
+ * update the check state accordingly.
+ *
+ * See also further comments on {@link #moveCheckState(int, int)}.
+ *
+ * @param position
+ */
+ public void removeCheckState(int position) {
+ SparseBooleanArray cip = getCheckedItemPositions();
+
+ if (cip.size() == 0)
+ return;
+ int[] runStart = new int[cip.size()];
+ int[] runEnd = new int[cip.size()];
+ int rangeStart = position;
+ int rangeEnd = cip.keyAt(cip.size() - 1) + 1;
+ int runCount = buildRunList(cip, rangeStart, rangeEnd, runStart, runEnd);
+ for (int i = 0; i != runCount; i++) {
+ if (!(runStart[i] == position || (runEnd[i] < runStart[i] && runEnd[i] > position))) {
+ // Only set a new check mark in front of this run if it does
+ // not contain the deleted position. If it does, we only need
+ // to make it one check mark shorter at the end.
+ setItemChecked(rotate(runStart[i], -1, rangeStart, rangeEnd), true);
+ }
+ setItemChecked(rotate(runEnd[i], -1, rangeStart, rangeEnd), false);
+ }
+ }
+
+ private static int buildRunList(SparseBooleanArray cip, int rangeStart,
+ int rangeEnd, int[] runStart, int[] runEnd) {
+ int runCount = 0;
+
+ int i = findFirstSetIndex(cip, rangeStart, rangeEnd);
+ if (i == -1)
+ return 0;
+
+ int position = cip.keyAt(i);
+ int currentRunStart = position;
+ int currentRunEnd = currentRunStart + 1;
+ for (i++; i < cip.size() && (position = cip.keyAt(i)) < rangeEnd; i++) {
+ if (!cip.valueAt(i)) // not checked => not interesting
+ continue;
+ if (position == currentRunEnd) {
+ currentRunEnd++;
+ } else {
+ runStart[runCount] = currentRunStart;
+ runEnd[runCount] = currentRunEnd;
+ runCount++;
+ currentRunStart = position;
+ currentRunEnd = position + 1;
+ }
+ }
+
+ if (currentRunEnd == rangeEnd) {
+ // rangeStart and rangeEnd are equivalent positions so to be
+ // consistent we translate them to the same integer value. That way
+ // we can check whether a run covers the entire range by just
+ // checking if the start equals the end position.
+ currentRunEnd = rangeStart;
+ }
+ runStart[runCount] = currentRunStart;
+ runEnd[runCount] = currentRunEnd;
+ runCount++;
+
+ if (runCount > 1) {
+ if (runStart[0] == rangeStart && runEnd[runCount - 1] == rangeStart) {
+ // The last run ends at the end of the range, and the first run
+ // starts at the beginning of the range. So they are actually
+ // part of the same run, except they wrap around the end of the
+ // range. To avoid adjacent runs, we need to merge them.
+ runStart[0] = runStart[runCount - 1];
+ runCount--;
+ }
+ }
+ return runCount;
+ }
+
+ private static int rotate(int value, int offset, int lowerBound, int upperBound) {
+ int windowSize = upperBound - lowerBound;
+
+ value += offset;
+ if (value < lowerBound) {
+ value += windowSize;
+ } else if (value >= upperBound) {
+ value -= windowSize;
+ }
+ return value;
+ }
+
+ private static int findFirstSetIndex(SparseBooleanArray sba, int rangeStart, int rangeEnd) {
+ int size = sba.size();
+ int i = insertionIndexForKey(sba, rangeStart);
+ while (i < size && sba.keyAt(i) < rangeEnd && !sba.valueAt(i))
+ i++;
+ if (i == size || sba.keyAt(i) >= rangeEnd)
+ return -1;
+ return i;
+ }
+
+ private static int insertionIndexForKey(SparseBooleanArray sba, int key) {
+ int low = 0;
+ int high = sba.size();
+ while (high - low > 0) {
+ int middle = (low + high) >> 1;
+ if (sba.keyAt(middle) < key)
+ low = middle + 1;
+ else
+ high = middle;
+ }
+ return low;
+ }
+
+ /**
+ * Interface for controlling
+ * scroll speed as a function of touch position and time. Use
+ * {@link DragSortListView#setDragScrollProfile(DragScrollProfile)} to
+ * set custom profile.
+ *
+ * @author heycosmo
+ *
+ */
+ public interface DragScrollProfile {
+ /**
+ * Return a scroll speed in pixels/millisecond. Always return a
+ * positive number.
+ *
+ * @param w Normalized position in scroll region (i.e. w \in [0,1]).
+ * Small w typically means slow scrolling.
+ * @param t Time (in milliseconds) since start of scroll (handy if you
+ * want scroll acceleration).
+ * @return Scroll speed at position w and time t in pixels/ms.
+ */
+ float getSpeed(float w, long t);
+ }
+
+ private class DragScroller implements Runnable {
+
+ private boolean mAbort;
+
+ private long mPrevTime;
+ private long mCurrTime;
+
+ private int dy;
+ private float dt;
+ private long tStart;
+ private int scrollDir;
+
+ public final static int STOP = -1;
+ public final static int UP = 0;
+ public final static int DOWN = 1;
+
+ private float mScrollSpeed; // pixels per ms
+
+ private boolean mScrolling = false;
+
+ private int mLastHeader;
+ private int mFirstFooter;
+
+ public boolean isScrolling() {
+ return mScrolling;
+ }
+
+ public int getScrollDir() {
+ return mScrolling ? scrollDir : STOP;
+ }
+
+ public DragScroller() {
+ }
+
+ public void startScrolling(int dir) {
+ if (!mScrolling) {
+ // Debug.startMethodTracing("dslv-scroll");
+ mAbort = false;
+ mScrolling = true;
+ tStart = SystemClock.uptimeMillis();
+ mPrevTime = tStart;
+ scrollDir = dir;
+ post(this);
+ }
+ }
+
+ public void stopScrolling(boolean now) {
+ if (now) {
+ DragSortListView.this.removeCallbacks(this);
+ mScrolling = false;
+ } else {
+ mAbort = true;
+ }
+
+ // Debug.stopMethodTracing();
+ }
+
+ @Override
+ public void run() {
+ if (mAbort) {
+ mScrolling = false;
+ return;
+ }
+
+ // Log.d("mobeta", "scroll");
+
+ final int first = getFirstVisiblePosition();
+ final int last = getLastVisiblePosition();
+ final int count = getCount();
+ final int padTop = getPaddingTop();
+ final int listHeight = getHeight() - padTop - getPaddingBottom();
+
+ int minY = Math.min(mY, mFloatViewMid + mFloatViewHeightHalf);
+ int maxY = Math.max(mY, mFloatViewMid - mFloatViewHeightHalf);
+
+ if (scrollDir == UP) {
+ View v = getChildAt(0);
+ // Log.d("mobeta", "vtop="+v.getTop()+" padtop="+padTop);
+ if (v == null) {
+ mScrolling = false;
+ return;
+ } else {
+ if (first == 0 && v.getTop() == padTop) {
+ mScrolling = false;
+ return;
+ }
+ }
+ mScrollSpeed = mScrollProfile.getSpeed((mUpScrollStartYF - maxY)
+ / mDragUpScrollHeight, mPrevTime);
+ } else {
+ View v = getChildAt(last - first);
+ if (v == null) {
+ mScrolling = false;
+ return;
+ } else {
+ if (last == count - 1 && v.getBottom() <= listHeight + padTop) {
+ mScrolling = false;
+ return;
+ }
+ }
+ mScrollSpeed = -mScrollProfile.getSpeed((minY - mDownScrollStartYF)
+ / mDragDownScrollHeight, mPrevTime);
+ }
+
+ mCurrTime = SystemClock.uptimeMillis();
+ dt = (float) (mCurrTime - mPrevTime);
+
+ // dy is change in View position of a list item; i.e. positive dy
+ // means user is scrolling up (list item moves down the screen,
+ // remember
+ // y=0 is at top of View).
+ dy = (int) Math.round(mScrollSpeed * dt);
+
+ int movePos;
+ if (dy >= 0) {
+ dy = Math.min(listHeight, dy);
+ movePos = first;
+ } else {
+ dy = Math.max(-listHeight, dy);
+ movePos = last;
+ }
+
+ final View moveItem = getChildAt(movePos - first);
+ int top = moveItem.getTop() + dy;
+
+ if (movePos == 0 && top > padTop) {
+ top = padTop;
+ }
+
+ // always do scroll
+ mBlockLayoutRequests = true;
+
+ setSelectionFromTop(movePos, top - padTop);
+ DragSortListView.this.layoutChildren();
+ invalidate();
+
+ mBlockLayoutRequests = false;
+
+ // scroll means relative float View movement
+ doDragFloatView(movePos, moveItem, false);
+
+ mPrevTime = mCurrTime;
+ // Log.d("mobeta", " updated prevTime="+mPrevTime);
+
+ post(this);
+ }
+ }
+
+ private class DragSortTracker {
+ StringBuilder mBuilder = new StringBuilder();
+
+ File mFile;
+
+ private int mNumInBuffer = 0;
+ private int mNumFlushes = 0;
+
+ private boolean mTracking = false;
+
+ public DragSortTracker() {
+ File root = Environment.getExternalStorageDirectory();
+ mFile = new File(root, "dslv_state.txt");
+
+ if (!mFile.exists()) {
+ try {
+ mFile.createNewFile();
+ Log.d("mobeta", "file created");
+ } catch (IOException e) {
+ Log.w("mobeta", "Could not create dslv_state.txt");
+ Log.d("mobeta", e.getMessage());
+ }
+ }
+
+ }
+
+ public void startTracking() {
+ mBuilder.append("position.
+ */
+ @Override
+ public View onCreateFloatView(int position) {
+ // Guaranteed that this will not be null? I think so. Nope, got
+ // a NullPointerException once...
+ View v = mListView.getChildAt(
+ position + mListView.getHeaderViewsCount() - mListView.getFirstVisiblePosition());
+
+ if (v == null) {
+ return null;
+ }
+
+ v.setPressed(false);
+
+ // Create a copy of the drawing cache so that it does not get
+ // recycled by the framework when the list tries to clean up memory
+ //v.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);
+ v.setDrawingCacheEnabled(true);
+ mFloatBitmap = Bitmap.createBitmap(v.getDrawingCache());
+ v.setDrawingCacheEnabled(false);
+
+ if (mImageView == null) {
+ mImageView = new ImageView(mListView.getContext());
+ }
+ mImageView.setBackgroundColor(mFloatBGColor);
+ mImageView.setPadding(0, 0, 0, 0);
+ mImageView.setImageBitmap(mFloatBitmap);
+ mImageView.setLayoutParams(new ViewGroup.LayoutParams(v.getWidth(), v.getHeight()));
+
+ return mImageView;
+ }
+
+ /**
+ * This does nothing
+ */
+ @Override
+ public void onDragFloatView(View floatView, Point position, Point touch) {
+ // do nothing
+ }
+
+ /**
+ * Removes the Bitmap from the ImageView created in
+ * onCreateFloatView() and tells the system to recycle it.
+ */
+ @Override
+ public void onDestroyFloatView(View floatView) {
+ ((ImageView) floatView).setImageDrawable(null);
+
+ mFloatBitmap.recycle();
+ mFloatBitmap = null;
+ }
+
+}