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diff --git a/js/ui/windowPreview.js b/js/ui/windowPreview.js
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+// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
+/* exported WindowPreview */
+
+const {
+ Atk, Clutter, GLib, GObject, Graphene, Meta, Pango, Shell, St,
+} = imports.gi;
+
+const DND = imports.ui.dnd;
+const OverviewControls = imports.ui.overviewControls;
+
+var WINDOW_DND_SIZE = 256;
+
+var WINDOW_OVERLAY_IDLE_HIDE_TIMEOUT = 750;
+var WINDOW_OVERLAY_FADE_TIME = 200;
+
+var WINDOW_SCALE_TIME = 200;
+var WINDOW_ACTIVE_SIZE_INC = 5; // in each direction
+
+var DRAGGING_WINDOW_OPACITY = 100;
+
+const ICON_SIZE = 64;
+const ICON_OVERLAP = 0.7;
+
+const ICON_TITLE_SPACING = 6;
+
+var WindowPreview = GObject.registerClass({
+ Properties: {
+ 'overlay-enabled': GObject.ParamSpec.boolean(
+ 'overlay-enabled', 'overlay-enabled', 'overlay-enabled',
+ GObject.ParamFlags.READWRITE,
+ true),
+ },
+ Signals: {
+ 'drag-begin': {},
+ 'drag-cancelled': {},
+ 'drag-end': {},
+ 'selected': { param_types: [GObject.TYPE_UINT] },
+ 'show-chrome': {},
+ 'size-changed': {},
+ },
+}, class WindowPreview extends Shell.WindowPreview {
+ _init(metaWindow, workspace, overviewAdjustment) {
+ this.metaWindow = metaWindow;
+ this.metaWindow._delegate = this;
+ this._windowActor = metaWindow.get_compositor_private();
+ this._workspace = workspace;
+ this._overviewAdjustment = overviewAdjustment;
+
+ super._init({
+ reactive: true,
+ can_focus: true,
+ accessible_role: Atk.Role.PUSH_BUTTON,
+ offscreen_redirect: Clutter.OffscreenRedirect.AUTOMATIC_FOR_OPACITY,
+ });
+
+ const windowContainer = new Clutter.Actor({
+ pivot_point: new Graphene.Point({ x: 0.5, y: 0.5 }),
+ });
+ this.window_container = windowContainer;
+
+ windowContainer.connect('notify::scale-x',
+ () => this._adjustOverlayOffsets());
+ // gjs currently can't handle setting an actors layout manager during
+ // the initialization of the actor if that layout manager keeps track
+ // of its container, so set the layout manager after creating the
+ // container
+ windowContainer.layout_manager = new Shell.WindowPreviewLayout();
+ this.add_child(windowContainer);
+
+ this._addWindow(metaWindow);
+
+ this._delegate = this;
+
+ this._stackAbove = null;
+
+ this._cachedBoundingBox = {
+ x: windowContainer.layout_manager.bounding_box.x1,
+ y: windowContainer.layout_manager.bounding_box.y1,
+ width: windowContainer.layout_manager.bounding_box.get_width(),
+ height: windowContainer.layout_manager.bounding_box.get_height(),
+ };
+
+ windowContainer.layout_manager.connect(
+ 'notify::bounding-box', layout => {
+ this._cachedBoundingBox = {
+ x: layout.bounding_box.x1,
+ y: layout.bounding_box.y1,
+ width: layout.bounding_box.get_width(),
+ height: layout.bounding_box.get_height(),
+ };
+
+ // A bounding box of 0x0 means all windows were removed
+ if (layout.bounding_box.get_area() > 0)
+ this.emit('size-changed');
+ });
+
+ this._windowActor.connectObject('destroy', () => this.destroy(), this);
+
+ this._updateAttachedDialogs();
+
+ let clickAction = new Clutter.ClickAction();
+ clickAction.connect('clicked', () => this._activate());
+ clickAction.connect('long-press', this._onLongPress.bind(this));
+ this.add_action(clickAction);
+ this.connect('destroy', this._onDestroy.bind(this));
+
+ this._draggable = DND.makeDraggable(this, {
+ restoreOnSuccess: true,
+ manualMode: true,
+ dragActorMaxSize: WINDOW_DND_SIZE,
+ dragActorOpacity: DRAGGING_WINDOW_OPACITY,
+ });
+ this._draggable.connect('drag-begin', this._onDragBegin.bind(this));
+ this._draggable.connect('drag-cancelled', this._onDragCancelled.bind(this));
+ this._draggable.connect('drag-end', this._onDragEnd.bind(this));
+ this.inDrag = false;
+
+ this._selected = false;
+ this._overlayEnabled = true;
+ this._overlayShown = false;
+ this._closeRequested = false;
+ this._idleHideOverlayId = 0;
+
+ const tracker = Shell.WindowTracker.get_default();
+ const app = tracker.get_window_app(this.metaWindow);
+ this._icon = app.create_icon_texture(ICON_SIZE);
+ this._icon.add_style_class_name('icon-dropshadow');
+ this._icon.set({
+ reactive: true,
+ pivot_point: new Graphene.Point({ x: 0.5, y: 0.5 }),
+ });
+ this._icon.add_constraint(new Clutter.BindConstraint({
+ source: windowContainer,
+ coordinate: Clutter.BindCoordinate.POSITION,
+ }));
+ this._icon.add_constraint(new Clutter.AlignConstraint({
+ source: windowContainer,
+ align_axis: Clutter.AlignAxis.X_AXIS,
+ factor: 0.5,
+ }));
+ this._icon.add_constraint(new Clutter.AlignConstraint({
+ source: windowContainer,
+ align_axis: Clutter.AlignAxis.Y_AXIS,
+ pivot_point: new Graphene.Point({ x: -1, y: ICON_OVERLAP }),
+ factor: 1,
+ }));
+
+ const { scaleFactor } = St.ThemeContext.get_for_stage(global.stage);
+ this._title = new St.Label({
+ visible: false,
+ style_class: 'window-caption',
+ text: this._getCaption(),
+ reactive: true,
+ });
+ this._title.clutter_text.single_line_mode = true;
+ this._title.add_constraint(new Clutter.BindConstraint({
+ source: windowContainer,
+ coordinate: Clutter.BindCoordinate.X,
+ }));
+ const iconBottomOverlap = ICON_SIZE * (1 - ICON_OVERLAP);
+ this._title.add_constraint(new Clutter.BindConstraint({
+ source: windowContainer,
+ coordinate: Clutter.BindCoordinate.Y,
+ offset: scaleFactor * (iconBottomOverlap + ICON_TITLE_SPACING),
+ }));
+ this._title.add_constraint(new Clutter.AlignConstraint({
+ source: windowContainer,
+ align_axis: Clutter.AlignAxis.X_AXIS,
+ factor: 0.5,
+ }));
+ this._title.add_constraint(new Clutter.AlignConstraint({
+ source: windowContainer,
+ align_axis: Clutter.AlignAxis.Y_AXIS,
+ pivot_point: new Graphene.Point({ x: -1, y: 0 }),
+ factor: 1,
+ }));
+ this._title.clutter_text.ellipsize = Pango.EllipsizeMode.END;
+ this.label_actor = this._title;
+ this.metaWindow.connectObject(
+ 'notify::title', () => (this._title.text = this._getCaption()),
+ this);
+
+ const layout = Meta.prefs_get_button_layout();
+ this._closeButtonSide =
+ layout.left_buttons.includes(Meta.ButtonFunction.CLOSE)
+ ? St.Side.LEFT : St.Side.RIGHT;
+
+ this._closeButton = new St.Button({
+ visible: false,
+ style_class: 'window-close',
+ icon_name: 'preview-close-symbolic',
+ });
+ this._closeButton.add_constraint(new Clutter.BindConstraint({
+ source: windowContainer,
+ coordinate: Clutter.BindCoordinate.POSITION,
+ }));
+ this._closeButton.add_constraint(new Clutter.AlignConstraint({
+ source: windowContainer,
+ align_axis: Clutter.AlignAxis.X_AXIS,
+ pivot_point: new Graphene.Point({ x: 0.5, y: -1 }),
+ factor: this._closeButtonSide === St.Side.LEFT ? 0 : 1,
+ }));
+ this._closeButton.add_constraint(new Clutter.AlignConstraint({
+ source: windowContainer,
+ align_axis: Clutter.AlignAxis.Y_AXIS,
+ pivot_point: new Graphene.Point({ x: -1, y: 0.5 }),
+ factor: 0,
+ }));
+ this._closeButton.connect('clicked', () => this._deleteAll());
+
+ this.add_child(this._title);
+ this.add_child(this._icon);
+ this.add_child(this._closeButton);
+
+ this._overviewAdjustment.connectObject(
+ 'notify::value', () => this._updateIconScale(), this);
+ this._updateIconScale();
+
+ this.connect('notify::realized', () => {
+ if (!this.realized)
+ return;
+
+ this._title.ensure_style();
+ this._icon.ensure_style();
+ });
+ }
+
+ _updateIconScale() {
+ const { ControlsState } = OverviewControls;
+ const { currentState, initialState, finalState } =
+ this._overviewAdjustment.getStateTransitionParams();
+ const visible =
+ initialState === ControlsState.WINDOW_PICKER ||
+ finalState === ControlsState.WINDOW_PICKER;
+ const scale = visible
+ ? 1 - Math.abs(ControlsState.WINDOW_PICKER - currentState) : 0;
+
+ this._icon.set({
+ scale_x: scale,
+ scale_y: scale,
+ });
+ }
+
+ _windowCanClose() {
+ return this.metaWindow.can_close() &&
+ !this._hasAttachedDialogs();
+ }
+
+ _getCaption() {
+ if (this.metaWindow.title)
+ return this.metaWindow.title;
+
+ let tracker = Shell.WindowTracker.get_default();
+ let app = tracker.get_window_app(this.metaWindow);
+ return app.get_name();
+ }
+
+ overlapHeights() {
+ const [, titleHeight] = this._title.get_preferred_height(-1);
+
+ const topOverlap = 0;
+ const bottomOverlap = ICON_TITLE_SPACING + titleHeight;
+
+ return [topOverlap, bottomOverlap];
+ }
+
+ chromeHeights() {
+ const [, closeButtonHeight] = this._closeButton.get_preferred_height(-1);
+ const [, iconHeight] = this._icon.get_preferred_height(-1);
+ const { scaleFactor } = St.ThemeContext.get_for_stage(global.stage);
+ const activeExtraSize = WINDOW_ACTIVE_SIZE_INC * scaleFactor;
+
+ const topOversize = closeButtonHeight / 2;
+ const bottomOversize = (1 - ICON_OVERLAP) * iconHeight;
+
+ return [
+ topOversize + activeExtraSize,
+ bottomOversize + activeExtraSize,
+ ];
+ }
+
+ chromeWidths() {
+ const [, closeButtonWidth] = this._closeButton.get_preferred_width(-1);
+ const { scaleFactor } = St.ThemeContext.get_for_stage(global.stage);
+ const activeExtraSize = WINDOW_ACTIVE_SIZE_INC * scaleFactor;
+
+ const leftOversize = this._closeButtonSide === St.Side.LEFT
+ ? closeButtonWidth / 2
+ : 0;
+ const rightOversize = this._closeButtonSide === St.Side.LEFT
+ ? 0
+ : closeButtonWidth / 2;
+
+ return [
+ leftOversize + activeExtraSize,
+ rightOversize + activeExtraSize,
+ ];
+ }
+
+ showOverlay(animate) {
+ if (!this._overlayEnabled)
+ return;
+
+ if (this._overlayShown)
+ return;
+
+ this._overlayShown = true;
+ this._restack();
+
+ // If we're supposed to animate and an animation in our direction
+ // is already happening, let that one continue
+ const ongoingTransition = this._title.get_transition('opacity');
+ if (animate &&
+ ongoingTransition &&
+ ongoingTransition.get_interval().peek_final_value() === 255)
+ return;
+
+ const toShow = this._windowCanClose()
+ ? [this._title, this._closeButton]
+ : [this._title];
+
+ toShow.forEach(a => {
+ a.opacity = 0;
+ a.show();
+ a.ease({
+ opacity: 255,
+ duration: animate ? WINDOW_OVERLAY_FADE_TIME : 0,
+ mode: Clutter.AnimationMode.EASE_OUT_QUAD,
+ });
+ });
+
+ const [width, height] = this.window_container.get_size();
+ const { scaleFactor } = St.ThemeContext.get_for_stage(global.stage);
+ const activeExtraSize = WINDOW_ACTIVE_SIZE_INC * 2 * scaleFactor;
+ const origSize = Math.max(width, height);
+ const scale = (origSize + activeExtraSize) / origSize;
+
+ this.window_container.ease({
+ scale_x: scale,
+ scale_y: scale,
+ duration: animate ? WINDOW_SCALE_TIME : 0,
+ mode: Clutter.AnimationMode.EASE_OUT_QUAD,
+ });
+
+ this.emit('show-chrome');
+ }
+
+ hideOverlay(animate) {
+ if (!this._overlayShown)
+ return;
+
+ this._overlayShown = false;
+ this._restack();
+
+ // If we're supposed to animate and an animation in our direction
+ // is already happening, let that one continue
+ const ongoingTransition = this._title.get_transition('opacity');
+ if (animate &&
+ ongoingTransition &&
+ ongoingTransition.get_interval().peek_final_value() === 0)
+ return;
+
+ [this._title, this._closeButton].forEach(a => {
+ a.opacity = 255;
+ a.ease({
+ opacity: 0,
+ duration: animate ? WINDOW_OVERLAY_FADE_TIME : 0,
+ mode: Clutter.AnimationMode.EASE_OUT_QUAD,
+ onComplete: () => a.hide(),
+ });
+ });
+
+ this.window_container.ease({
+ scale_x: 1,
+ scale_y: 1,
+ duration: animate ? WINDOW_SCALE_TIME : 0,
+ mode: Clutter.AnimationMode.EASE_OUT_QUAD,
+ });
+ }
+
+ _adjustOverlayOffsets() {
+ // Assume that scale-x and scale-y update always set
+ // in lock-step; that allows us to not use separate
+ // handlers for horizontal and vertical offsets
+ const previewScale = this.window_container.scale_x;
+ const [previewWidth, previewHeight] =
+ this.window_container.allocation.get_size();
+
+ const heightIncrease =
+ Math.floor(previewHeight * (previewScale - 1) / 2);
+ const widthIncrease =
+ Math.floor(previewWidth * (previewScale - 1) / 2);
+
+ const closeAlign = this._closeButtonSide === St.Side.LEFT ? -1 : 1;
+
+ this._icon.translation_y = heightIncrease;
+ this._title.translation_y = heightIncrease;
+ this._closeButton.set({
+ translation_x: closeAlign * widthIncrease,
+ translation_y: -heightIncrease,
+ });
+ }
+
+ _addWindow(metaWindow) {
+ const clone = this.window_container.layout_manager.add_window(metaWindow);
+ if (!clone)
+ return;
+
+ // We expect this to be used for all interaction rather than
+ // the ClutterClone; as the former is reactive and the latter
+ // is not, this just works for most cases. However, for DND all
+ // actors are picked, so DND operations would operate on the clone.
+ // To avoid this, we hide it from pick.
+ Shell.util_set_hidden_from_pick(clone, true);
+ }
+
+ vfunc_has_overlaps() {
+ return this._hasAttachedDialogs() ||
+ this._icon.visible ||
+ this._closeButton.visible;
+ }
+
+ _deleteAll() {
+ const windows = this.window_container.layout_manager.get_windows();
+
+ // Delete all windows, starting from the bottom-most (most-modal) one
+ for (const window of windows.reverse())
+ window.delete(global.get_current_time());
+
+ this._closeRequested = true;
+ }
+
+ addDialog(win) {
+ let parent = win.get_transient_for();
+ while (parent.is_attached_dialog())
+ parent = parent.get_transient_for();
+
+ // Display dialog if it is attached to our metaWindow
+ if (win.is_attached_dialog() && parent == this.metaWindow)
+ this._addWindow(win);
+
+ // The dialog popped up after the user tried to close the window,
+ // assume it's a close confirmation and leave the overview
+ if (this._closeRequested)
+ this._activate();
+ }
+
+ _hasAttachedDialogs() {
+ return this.window_container.layout_manager.get_windows().length > 1;
+ }
+
+ _updateAttachedDialogs() {
+ let iter = win => {
+ let actor = win.get_compositor_private();
+
+ if (!actor)
+ return false;
+ if (!win.is_attached_dialog())
+ return false;
+
+ this._addWindow(win);
+ win.foreach_transient(iter);
+ return true;
+ };
+ this.metaWindow.foreach_transient(iter);
+ }
+
+ get boundingBox() {
+ return { ...this._cachedBoundingBox };
+ }
+
+ get windowCenter() {
+ return {
+ x: this._cachedBoundingBox.x + this._cachedBoundingBox.width / 2,
+ y: this._cachedBoundingBox.y + this._cachedBoundingBox.height / 2,
+ };
+ }
+
+ get overlayEnabled() {
+ return this._overlayEnabled;
+ }
+
+ set overlayEnabled(enabled) {
+ if (this._overlayEnabled === enabled)
+ return;
+
+ this._overlayEnabled = enabled;
+ this.notify('overlay-enabled');
+
+ if (!enabled)
+ this.hideOverlay(false);
+ else if (this['has-pointer'] || global.stage.key_focus === this)
+ this.showOverlay(true);
+ }
+
+ // Find the actor just below us, respecting reparenting done by DND code
+ _getActualStackAbove() {
+ if (this._stackAbove == null)
+ return null;
+
+ if (this.inDrag) {
+ if (this._stackAbove._delegate)
+ return this._stackAbove._delegate._getActualStackAbove();
+ else
+ return null;
+ } else {
+ return this._stackAbove;
+ }
+ }
+
+ setStackAbove(actor) {
+ this._stackAbove = actor;
+ if (this.inDrag)
+ // We'll fix up the stack after the drag
+ return;
+
+ let parent = this.get_parent();
+ let actualAbove = this._getActualStackAbove();
+ if (actualAbove == null)
+ parent.set_child_below_sibling(this, null);
+ else
+ parent.set_child_above_sibling(this, actualAbove);
+ }
+
+ _onDestroy() {
+ this.metaWindow._delegate = null;
+ this._delegate = null;
+ this._destroyed = true;
+
+ if (this._longPressLater) {
+ Meta.later_remove(this._longPressLater);
+ delete this._longPressLater;
+ }
+
+ if (this._idleHideOverlayId > 0) {
+ GLib.source_remove(this._idleHideOverlayId);
+ this._idleHideOverlayId = 0;
+ }
+
+ if (this.inDrag) {
+ this.emit('drag-end');
+ this.inDrag = false;
+ }
+ }
+
+ _activate() {
+ this._selected = true;
+ this.emit('selected', global.get_current_time());
+ }
+
+ vfunc_enter_event(crossingEvent) {
+ this.showOverlay(true);
+ return super.vfunc_enter_event(crossingEvent);
+ }
+
+ vfunc_leave_event(crossingEvent) {
+ if (this._destroyed)
+ return super.vfunc_leave_event(crossingEvent);
+
+ if ((crossingEvent.flags & Clutter.EventFlags.FLAG_GRAB_NOTIFY) !== 0 &&
+ global.stage.get_grab_actor() === this._closeButton)
+ return super.vfunc_leave_event(crossingEvent);
+
+ if (this._idleHideOverlayId > 0)
+ GLib.source_remove(this._idleHideOverlayId);
+
+ this._idleHideOverlayId = GLib.timeout_add(
+ GLib.PRIORITY_DEFAULT,
+ WINDOW_OVERLAY_IDLE_HIDE_TIMEOUT, () => {
+ if (this._closeButton['has-pointer'] ||
+ this._title['has-pointer'])
+ return GLib.SOURCE_CONTINUE;
+
+ if (!this['has-pointer'])
+ this.hideOverlay(true);
+
+ this._idleHideOverlayId = 0;
+ return GLib.SOURCE_REMOVE;
+ });
+
+ GLib.Source.set_name_by_id(this._idleHideOverlayId, '[gnome-shell] this._idleHideOverlayId');
+
+ return super.vfunc_leave_event(crossingEvent);
+ }
+
+ vfunc_key_focus_in() {
+ super.vfunc_key_focus_in();
+ this.showOverlay(true);
+ }
+
+ vfunc_key_focus_out() {
+ super.vfunc_key_focus_out();
+
+ if (global.stage.get_grab_actor() !== this._closeButton)
+ this.hideOverlay(true);
+ }
+
+ vfunc_key_press_event(keyEvent) {
+ let symbol = keyEvent.keyval;
+ let isEnter = symbol == Clutter.KEY_Return || symbol == Clutter.KEY_KP_Enter;
+ if (isEnter) {
+ this._activate();
+ return true;
+ }
+
+ return super.vfunc_key_press_event(keyEvent);
+ }
+
+ _onLongPress(action, actor, state) {
+ // Take advantage of the Clutter policy to consider
+ // a long-press canceled when the pointer movement
+ // exceeds dnd-drag-threshold to manually start the drag
+ if (state == Clutter.LongPressState.CANCEL) {
+ let event = Clutter.get_current_event();
+ this._dragTouchSequence = event.get_event_sequence();
+
+ if (this._longPressLater)
+ return true;
+
+ // A click cancels a long-press before any click handler is
+ // run - make sure to not start a drag in that case
+ this._longPressLater = Meta.later_add(Meta.LaterType.BEFORE_REDRAW, () => {
+ delete this._longPressLater;
+ if (this._selected) {
+ this._selected = false;
+ return;
+ }
+ let [x, y] = action.get_coords();
+ action.release();
+ this._draggable.startDrag(x, y, global.get_current_time(), this._dragTouchSequence, event.get_device());
+ });
+ } else {
+ this.showOverlay(true);
+ }
+ return true;
+ }
+
+ _restack() {
+ // We may not have a parent if DnD completed successfully, in
+ // which case our clone will shortly be destroyed and replaced
+ // with a new one on the target workspace.
+ const parent = this.get_parent();
+ if (parent !== null) {
+ if (this._overlayShown)
+ parent.set_child_above_sibling(this, null);
+ else if (this._stackAbove === null)
+ parent.set_child_below_sibling(this, null);
+ else if (!this._stackAbove._overlayShown)
+ parent.set_child_above_sibling(this, this._stackAbove);
+ }
+ }
+
+ _onDragBegin(_draggable, _time) {
+ this.inDrag = true;
+ this.hideOverlay(false);
+ this.emit('drag-begin');
+ }
+
+ handleDragOver(source, actor, x, y, time) {
+ return this._workspace.handleDragOver(source, actor, x, y, time);
+ }
+
+ acceptDrop(source, actor, x, y, time) {
+ return this._workspace.acceptDrop(source, actor, x, y, time);
+ }
+
+ _onDragCancelled(_draggable, _time) {
+ this.emit('drag-cancelled');
+ }
+
+ _onDragEnd(_draggable, _time, _snapback) {
+ this.inDrag = false;
+
+ this._restack();
+
+ if (this['has-pointer'])
+ this.showOverlay(true);
+
+ this.emit('drag-end');
+ }
+});