var i, len = items.length;

for (i = 0; i < len; i++) {

if (items[i].kind === "file") {

var entry = items[i].webkitGetAsEntry();

if (entry.isFile) {

// If any files are being dropped, this is a valid drop

return true;

} else if (len === 1) {

// If exactly one folder is being dropped, this is a valid drop

return true;

}

}

}

// No valid entries found

return false;

var types = event.dataTransfer.types;

if ((!files || !files.length) && types) { // We only want to check if a string of text was dragged into the editor

types.forEach(function (value) {

//Dragging text externally (dragging text from another file): types has "text/plain" and "text/html"

//Dragging text internally (dragging text to another line): types has just "text/plain"

//Dragging a file: types has "Files"

//Dragging a url: types has "text/plain" and "text/uri-list" <-what we are interested in

if (value === "text/uri-list") {

event.stopPropagation();

event.preventDefault();

return;

}

});

}

var errorFiles = [],

ERR_MULTIPLE_ITEMS_WITH_DIR = {};

return Async.doInParallel(paths, function (path, idx) {

var result = new $.Deferred();

// Only open files.

FileSystem.resolve(path, function (err, item) {

if (!err && item.isFile) {

// If the file is already open, and this isn't the last

// file in the list, return. If this *is* the last file,

// always open it so it gets selected.

if (idx < paths.length - 1) {

if (MainViewManager.findInWorkingSet(MainViewManager.ALL_PANES, path) !== -1) {

result.resolve();

return;

}

}

CommandManager.execute(Commands.CMD_ADD_TO_WORKINGSET_AND_OPEN,

{fullPath: path, silent: true})

.done(function () {

result.resolve();

})

.fail(function (openErr) {

errorFiles.push({path: path, error: openErr});

result.reject();

});

} else if (!err && item.isDirectory && paths.length === 1) {

// One folder was dropped, open it.

ProjectManager.openProject(path)

.done(function () {

result.resolve();

})

.fail(function () {

// User was already notified of the error.

result.reject();

});

} else {

errorFiles.push({path: path, error: err || ERR_MULTIPLE_ITEMS_WITH_DIR});

result.reject();

}

});

return result.promise();

}, false)

.fail(function () {

function errorToString(err) {

if (err === ERR_MULTIPLE_ITEMS_WITH_DIR) {

return Strings.ERROR_MIXED_DRAGDROP;

} else {

return FileUtils.getFileErrorString(err);

}

}

if (errorFiles.length > 0) {

var message = Strings.ERROR_OPENING_FILES;

message += "<ul class='dialog-list'>";

errorFiles.forEach(function (info) {

message += "<li><span class='dialog-filename'>" +

StringUtils.breakableUrl(ProjectManager.makeProjectRelativeIfPossible(info.path)) +

"</span> - " + errorToString(info.error) +

"</li>";

});

message += "</ul>";

Dialogs.showModalDialog(

DefaultDialogs.DIALOG_ID_ERROR,

Strings.ERROR_OPENING_FILE_TITLE,

message

);

}

});

function handleDragOver(event) {

event = event.originalEvent || event;

var files = event.dataTransfer.files;

stopURIListPropagation(files, event);

if (files && files.length) {

event.stopPropagation();

event.preventDefault();

var dropEffect = "none";

// Don't allow drag-and-drop of files/folders when a modal dialog is showing.

if ($(".modal.instance").length === 0 && isValidDrop(event.dataTransfer.items)) {

dropEffect = "copy";

}

event.dataTransfer.dropEffect = dropEffect;

}

}

function handleDrop(event) {

event = event.originalEvent || event;

var files = event.dataTransfer.files;

stopURIListPropagation(files, event);

if (files && files.length) {

event.stopPropagation();

event.preventDefault();

brackets.app.getDroppedFiles(function (err, paths) {

if (!err) {

openDroppedFiles(paths);

}

});

}

}

// For most of the window, only respond if nothing more specific in the UI has already grabbed the event (e.g.

// the Extension Manager drop-to-install zone, or an extension with a drop-to-upload zone in its panel)

$(window.document.body)

.on("dragover", handleDragOver)

.on("drop", handleDrop);

// Over CodeMirror specifically, always pre-empt CodeMirror's drag event handling if files are being dragged - CM stops

// propagation on any drag event it sees, even when it's not a text drag/drop. But allow CM to handle all non-file drag

// events. See bug #10617.

window.document.body.addEventListener("dragover", function (event) {

if ($(event.target).closest(".CodeMirror").length) {

handleDragOver(event);

}

}, true);

window.document.body.addEventListener("drop", function (event) {

if ($(event.target).closest(".CodeMirror").length) {

handleDrop(event);

}

}, true);