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Support drag-drop folders for WASM #5563

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112 changes: 112 additions & 0 deletions wasm/reset_events.js
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Original file line number Diff line number Diff line change
Expand Up @@ -82,6 +82,114 @@ var preventFunc = function (event) {
event.preventDefault();
}

var drop_files_or_dir = function (event) {
if (!GLFW.active || !GLFW.active.dropFunc) return;
if (!event.dataTransfer || !event.dataTransfer.files || event.dataTransfer.files.length == 0) return;
event.preventDefault();

var drop_dir = ".glfw_dropped_files";
var filenames = _malloc(event.dataTransfer.files.length * getPointerSize());
var filenamesArray = [];
for (var i = 0; i < event.dataTransfer.files.length; ++i) {
var path = "/" + drop_dir + "/" + event.dataTransfer.files[i].name.replace(/\//g, "_");
var filename = stringToNewUTF8(path);
filenamesArray.push(filename);
if (getPointerSize() == 8)
HEAPU64[(filenames + i * 8) / 8] = BigInt(filename);
else if (typeof GROWABLE_HEAP_U32 !== 'undefined')
GROWABLE_HEAP_U32()[filenames + i * 4 >> 2] = filename;
else
HEAPU32[filenames + i * 4 >> 2] = filename;
}

// Read and save the files to emscripten's FS
var written = 0;
FS.createPath("/", drop_dir);
function save(file, in_path, numfiles) {
var path = "/" + drop_dir + in_path + "/" + file.name.replace(/\//g, "_");
var reader = new FileReader;
reader.onloadend = e => {
if (reader.readyState != 2) {
// not DONE
++written;
out("failed to read dropped file: " + file.name + ": " + reader.error);
return;
}
var data = e.target.result;
FS.writeFile(path, new Uint8Array(data));
if (++written === numfiles) {
if (typeof (dynCall_viii) == 'function')
dynCall_viii(GLFW.active.dropFunc, GLFW.active.id, filenamesArray.length, filenames);
else if (typeof (dynCall_vjii) == 'function')
dynCall_vjii(GLFW.active.dropFunc, BigInt(GLFW.active.id), filenamesArray.length, filenames);
else
getWasmTableEntry(GLFW.active.dropFunc)(toPointer(GLFW.active.id), filenamesArray.length, filenames);
for (var i = 0; i < filenamesArray.length; ++i) {
_free(filenamesArray[i]);
}
_free(filenames);
}
};
reader.readAsArrayBuffer(file);
}

let filesQ = [];
var finalize = function () {
count = filesQ.length;
for (var i = 0; i < count; ++i)
save(filesQ[i].file, filesQ[i].path, count);
}

if (typeof DataTransferItem.prototype.webkitGetAsEntry !== "undefined") {
let entriesTree = {};
var markDone = function (fullpath, recursive) {
if (entriesTree[fullpath].subpaths.length != 0) return;
delete entriesTree[fullpath];
let parentpath = fullpath.substring(0, fullpath.lastIndexOf('/'));
if (!entriesTree.hasOwnProperty(parentpath)) {
if (Object.keys(entriesTree).length == 0) finalize();
return;
}
const fpIndex = entriesTree[parentpath].subpaths.indexOf(fullpath);
if (fpIndex > -1) entriesTree[parentpath].subpaths.splice(fpIndex, 1);
if (recursive) markDone(parentpath, true);
if (Object.keys(entriesTree).length == 0) finalize();
};
var processEntry = function (entry) {
let fp = entry.fullPath;
let pp = fp.substring(0, fp.lastIndexOf('/'));
entriesTree[fp] = { subpaths: [] };
if (entry.isFile) {
entry.file((f) => { filesQ.push({ file: f, path: pp }); markDone(fp, false); })
} else if (entry.isDirectory) {
if (entriesTree.hasOwnProperty(pp)) entriesTree[pp].subpaths.push(fp);
FS.createPath("/" + drop_dir + pp, entry.name);
var reader = entry.createReader();
var rRead = function (dirEntries) {
if (dirEntries.length == 0) {
markDone(fp, true);
return;
}
for (const ent of dirEntries) processEntry(ent);
reader.readEntries(rRead);
};
reader.readEntries(rRead);
}
};
for (const item of event.dataTransfer.items) {
processEntry(item.webkitGetAsEntry());
}
}
else {
// fallback for browsers that does not support `webkitGetAsEntry`
for (var i = 0; i < event.dataTransfer.files.length; ++i) {
filesQ.push({ file: event.dataTransfer.files[i], path: "" });
}
finalize();
}
return false;
}

var updateEvents = function () {
// remove all touch events
Module["canvas"].removeEventListener("touchmove", GLFW.onMousemove, true);
Expand All @@ -96,6 +204,7 @@ var updateEvents = function () {
Module["canvas"].removeEventListener("wheel", GLFW.onMouseWheel, true);
Module["canvas"].removeEventListener("mousewheel", GLFW.onMouseWheel, true);
Module["canvas"].removeEventListener("dragover", GLFW.onDragover, true);
Module["canvas"].removeEventListener("drop", GLFW.onDrop, true);

// make own touch events callbacks
var touchEventProcess = function (event, funcName) {
Expand Down Expand Up @@ -246,6 +355,8 @@ var updateEvents = function () {
return false
}

GLFW.onDrop = drop_files_or_dir;

// add new events
Module["canvas"].addEventListener("pointermove", GLFW.onMousemove, true);
Module["canvas"].addEventListener("pointerdown", GLFW.onMouseButtonDown, true);
Expand All @@ -254,6 +365,7 @@ var updateEvents = function () {
Module["canvas"].addEventListener("wheel", GLFW.onMouseWheel, true);
Module["canvas"].addEventListener("mousewheel", GLFW.onMouseWheel, true);
Module["canvas"].addEventListener("dragover", GLFW.onDragover, true);
Module["canvas"].addEventListener("drop", GLFW.onDrop, true);
Module["canvas"].addEventListener("dragenter", (e) => {
Module.ccall('emsDragEnter', 'void', [], []);
}, true);
Expand Down
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