gnome-shell/js/ui/windowPreview.js
Jonas Dreßler 04c781674c Move WindowPreviewLayout from JS to C
This layout manager is used quite often and the time we spend calling
it's allocate and get_preferred_width/heigth functions increases with
every open window.

We can save a lot of precious time during the layout cycle by moving
this layout manager from JS to C, thus avoiding the overhead of
trampolining between C and JS land.

In a measurement where the average time spent in vfunc_allocate() of the
Workspace actor was measured while opening an overview with 20 windows,
the average time spent went down from 3.1 ms to 2.3 ms.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1743>
2021-03-09 15:40:49 +00:00

706 lines
23 KiB
JavaScript

// -*- 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 St.Widget {
_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,
});
this._windowContainer = new Clutter.Actor({
pivot_point: new Graphene.Point({ x: 0.5, y: 0.5 }),
});
this._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
this._windowContainer.layout_manager = new Shell.WindowPreviewLayout();
this.add_child(this._windowContainer);
this._addWindow(metaWindow);
this._delegate = this;
this._stackAbove = null;
this._cachedBoundingBox = {
x: this._windowContainer.layout_manager.bounding_box.x1,
y: this._windowContainer.layout_manager.bounding_box.y1,
width: this._windowContainer.layout_manager.bounding_box.get_width(),
height: this._windowContainer.layout_manager.bounding_box.get_height(),
};
this._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._windowDestroyId =
this._windowActor.connect('destroy', () => this.destroy());
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: this._windowContainer,
coordinate: Clutter.BindCoordinate.POSITION,
}));
this._icon.add_constraint(new Clutter.AlignConstraint({
source: this._windowContainer,
align_axis: Clutter.AlignAxis.X_AXIS,
factor: 0.5,
}));
this._icon.add_constraint(new Clutter.AlignConstraint({
source: this._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.add_constraint(new Clutter.BindConstraint({
source: this._windowContainer,
coordinate: Clutter.BindCoordinate.X,
}));
const iconBottomOverlap = ICON_SIZE * (1 - ICON_OVERLAP);
this._title.add_constraint(new Clutter.BindConstraint({
source: this._windowContainer,
coordinate: Clutter.BindCoordinate.Y,
offset: scaleFactor * (iconBottomOverlap + ICON_TITLE_SPACING),
}));
this._title.add_constraint(new Clutter.AlignConstraint({
source: this._windowContainer,
align_axis: Clutter.AlignAxis.X_AXIS,
factor: 0.5,
}));
this._title.add_constraint(new Clutter.AlignConstraint({
source: this._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._updateCaptionId = this.metaWindow.connect('notify::title', () => {
this._title.text = this._getCaption();
});
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',
child: new St.Icon({ icon_name: 'preview-close-symbolic' }),
});
this._closeButton.add_constraint(new Clutter.BindConstraint({
source: this._windowContainer,
coordinate: Clutter.BindCoordinate.POSITION,
}));
this._closeButton.add_constraint(new Clutter.AlignConstraint({
source: this._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: this._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._adjustmentChangedId =
this._overviewAdjustment.connect('notify::value', () => {
this._updateIconScale();
});
this._updateIconScale();
this.connect('notify::realized', () => {
if (!this.realized)
return;
this._title.ensure_style();
this._icon.ensure_style();
});
}
vfunc_get_preferred_width(forHeight) {
const themeNode = this.get_theme_node();
// Only include window previews in size request, not chrome
const [minWidth, natWidth] =
this._windowContainer.get_preferred_width(
themeNode.adjust_for_height(forHeight));
return themeNode.adjust_preferred_width(minWidth, natWidth);
}
vfunc_get_preferred_height(forWidth) {
const themeNode = this.get_theme_node();
const [minHeight, natHeight] =
this._windowContainer.get_preferred_height(
themeNode.adjust_for_width(forWidth));
return themeNode.adjust_preferred_height(minHeight, natHeight);
}
vfunc_allocate(box) {
this.set_allocation(box);
for (const child of this)
child.allocate_available_size(0, 0, box.get_width(), box.get_height());
}
_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._windowContainer.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._windowContainer.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._windowContainer.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._windowContainer.scale_x;
const [previewWidth, previewHeight] =
this._windowContainer.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._windowContainer.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._windowContainer.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._windowContainer.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._windowActor.disconnect(this._windowDestroyId);
this.metaWindow._delegate = null;
this._delegate = null;
this.metaWindow.disconnect(this._updateCaptionId);
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._adjustmentChangedId > 0) {
this._overviewAdjustment.disconnect(this._adjustmentChangedId);
this._adjustmentChangedId = 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._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();
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');
}
});