Add support to drag selected images to external applications

taggui/models/image_list_model.py

@@ -8,8 +8,8 @@
 
 import exifread
 import imagesize
-from PySide6.QtCore import (QAbstractListModel, QModelIndex, QSize, Qt, Signal,
-                            Slot)
+from PySide6.QtCore import (QAbstractListModel, QModelIndex, QMimeData, QSize,
+                            Qt, QUrl, Signal, Slot)
 from PySide6.QtGui import QIcon, QImageReader, QPixmap
 from PySide6.QtWidgets import QMessageBox
 
@@ -60,6 +60,25 @@ def __init__(self, image_list_image_width: int, tag_separator: str):
         self.proxy_image_list_model = None
         self.image_list_selection_model = None
 
+    def flags(self, index):
+        default_flags = super().flags(index)
+        if index.isValid():
+            return Qt.ItemFlags.ItemIsDragEnabled | default_flags
+        return default_flags
+
+    def mimeTypes(self):
+        return ('text/uri-list', 'text/plain')
+
+    def mimeData(self, indexes):
+        mimeData = QMimeData()
+        mimeData.setUrls([QUrl('file://' + str(self.data(
+            image_index, Qt.ItemDataRole.UserRole
+            ).path)) for image_index in indexes])
+        mimeData.setText('\r\n'.join(['file://' + str(self.data(
+            image_index, Qt.ItemDataRole.UserRole
+            ).path) for image_index in indexes]))
+        return mimeData
+
     def rowCount(self, parent=None) -> int:
         return len(self.images)
 

taggui/widgets/image_list.py

@@ -107,6 +107,7 @@ def __init__(self, parent, proxy_image_list_model: ProxyImageListModel,
         self.tag_separator = tag_separator
         self.setModel(proxy_image_list_model)
         self.setWordWrap(True)
+        self.setDragEnabled(True)
         # If the actual height of the image is greater than 3 times the width,
         # the image will be scaled down to fit.
         self.setIconSize(QSize(image_width, image_width * 3))
@@ -427,3 +428,4 @@ def jump_to_first_untagged_image(self):
 
     def get_selected_image_indices(self) -> list[QModelIndex]:
         return self.list_view.get_selected_image_indices()
+