117 lines
4.1 KiB
JavaScript
117 lines
4.1 KiB
JavaScript
// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
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/* exported XdndHandler */
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const Clutter = imports.gi.Clutter;
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const Signals = imports.misc.signals;
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const DND = imports.ui.dnd;
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const Main = imports.ui.main;
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var XdndHandler = class extends Signals.EventEmitter {
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constructor() {
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super();
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// Used to display a clone of the cursor window when the
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// window group is hidden (like it happens in the overview)
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this._cursorWindowClone = null;
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// Used as a drag actor in case we don't have a cursor window clone
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this._dummy = new Clutter.Actor({ width: 1, height: 1, opacity: 0 });
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Main.uiGroup.add_actor(this._dummy);
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this._dummy.hide();
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var dnd = global.backend.get_dnd();
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dnd.connect('dnd-enter', this._onEnter.bind(this));
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dnd.connect('dnd-position-change', this._onPositionChanged.bind(this));
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dnd.connect('dnd-leave', this._onLeave.bind(this));
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}
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// Called when the user cancels the drag (i.e release the button)
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_onLeave() {
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global.window_group.disconnectObject(this);
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if (this._cursorWindowClone) {
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this._cursorWindowClone.destroy();
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this._cursorWindowClone = null;
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}
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this.emit('drag-end');
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}
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_onEnter() {
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global.window_group.connectObject('notify::visible',
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this._onWindowGroupVisibilityChanged.bind(this), this);
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this.emit('drag-begin', global.get_current_time());
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}
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_onWindowGroupVisibilityChanged() {
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if (!global.window_group.visible) {
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if (this._cursorWindowClone)
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return;
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let windows = global.get_window_actors();
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let cursorWindow = windows[windows.length - 1];
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// FIXME: more reliable way?
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if (!cursorWindow.get_meta_window().is_override_redirect())
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return;
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const constraintPosition = new Clutter.BindConstraint({
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coordinate: Clutter.BindCoordinate.POSITION,
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source: cursorWindow,
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});
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this._cursorWindowClone = new Clutter.Clone({ source: cursorWindow });
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Main.uiGroup.add_actor(this._cursorWindowClone);
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// Make sure that the clone has the same position as the source
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this._cursorWindowClone.add_constraint(constraintPosition);
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} else {
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if (!this._cursorWindowClone)
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return;
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this._cursorWindowClone.destroy();
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this._cursorWindowClone = null;
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}
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}
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_onPositionChanged(obj, x, y) {
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let pickedActor = global.stage.get_actor_at_pos(Clutter.PickMode.REACTIVE, x, y);
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// Make sure that the cursor window is on top
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if (this._cursorWindowClone)
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Main.uiGroup.set_child_above_sibling(this._cursorWindowClone, null);
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let dragEvent = {
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x,
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y,
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dragActor: this._cursorWindowClone ?? this._dummy,
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source: this,
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targetActor: pickedActor,
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};
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for (let i = 0; i < DND.dragMonitors.length; i++) {
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let motionFunc = DND.dragMonitors[i].dragMotion;
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if (motionFunc) {
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let result = motionFunc(dragEvent);
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if (result != DND.DragMotionResult.CONTINUE)
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return;
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}
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}
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while (pickedActor) {
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if (pickedActor._delegate && pickedActor._delegate.handleDragOver) {
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let [r_, targX, targY] = pickedActor.transform_stage_point(x, y);
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let result = pickedActor._delegate.handleDragOver(this,
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dragEvent.dragActor,
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targX,
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targY,
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global.get_current_time());
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if (result != DND.DragMotionResult.CONTINUE)
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return;
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}
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pickedActor = pickedActor.get_parent();
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}
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}
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};
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