gnome-shell/js/ui/altTab.js

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/* -*- mode: js2; js2-basic-offset: 4; indent-tabs-mode: nil -*- */
const Big = imports.gi.Big;
const Clutter = imports.gi.Clutter;
const Lang = imports.lang;
const Meta = imports.gi.Meta;
const Pango = imports.gi.Pango;
const Shell = imports.gi.Shell;
const Main = imports.ui.main;
const Tweener = imports.ui.tweener;
const POPUP_BG_COLOR = new Clutter.Color();
POPUP_BG_COLOR.from_pixel(0x00000080);
const POPUP_INDICATOR_COLOR = new Clutter.Color();
POPUP_INDICATOR_COLOR.from_pixel(0xf0f0f0ff);
const POPUP_TRANSPARENT = new Clutter.Color();
POPUP_TRANSPARENT.from_pixel(0x00000000);
const POPUP_INDICATOR_WIDTH = 4;
const POPUP_GRID_SPACING = 8;
const POPUP_ICON_SIZE = 48;
const POPUP_NUM_COLUMNS = 5;
const POPUP_LABEL_MAX_WIDTH = POPUP_NUM_COLUMNS * (POPUP_ICON_SIZE + POPUP_GRID_SPACING);
const OVERLAY_COLOR = new Clutter.Color();
OVERLAY_COLOR.from_pixel(0x00000044);
const SHOW_TIME = 0.05;
const SWITCH_TIME = 0.1;
function AltTabPopup() {
this._init();
}
AltTabPopup.prototype = {
_init : function() {
let global = Shell.Global.get();
this.actor = new Big.Box({ background_color : POPUP_BG_COLOR,
corner_radius: POPUP_GRID_SPACING,
padding: POPUP_GRID_SPACING,
spacing: POPUP_GRID_SPACING,
orientation: Big.BoxOrientation.VERTICAL });
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// Icon grid. TODO: Investigate Nbtk.Grid once that lands. Currently
// just implemented using a chain of Big.Box.
this._grid = new Big.Box({ spacing: POPUP_GRID_SPACING,
orientation: Big.BoxOrientation.VERTICAL });
let gcenterbox = new Big.Box({ orientation: Big.BoxOrientation.HORIZONTAL,
x_align: Big.BoxAlignment.CENTER });
gcenterbox.append(this._grid, Big.BoxPackFlags.NONE);
this.actor.append(gcenterbox, Big.BoxPackFlags.NONE);
// Selected-window label
this._label = new Clutter.Text({ font_name: "Sans 16px",
ellipsize: Pango.EllipsizeMode.END });
let labelbox = new Big.Box({ background_color: POPUP_INDICATOR_COLOR,
corner_radius: POPUP_GRID_SPACING / 2,
padding: POPUP_GRID_SPACING / 2 });
labelbox.append(this._label, Big.BoxPackFlags.NONE);
let lcenterbox = new Big.Box({ orientation: Big.BoxOrientation.HORIZONTAL,
x_align: Big.BoxAlignment.CENTER,
width: POPUP_LABEL_MAX_WIDTH + POPUP_GRID_SPACING });
lcenterbox.append(labelbox, Big.BoxPackFlags.NONE);
this.actor.append(lcenterbox, Big.BoxPackFlags.NONE);
// Indicator around selected icon
this._indicator = new Big.Rectangle({ border_width: POPUP_INDICATOR_WIDTH,
corner_radius: POPUP_INDICATOR_WIDTH / 2,
border_color: POPUP_INDICATOR_COLOR,
color: POPUP_TRANSPARENT });
this.actor.append(this._indicator, Big.BoxPackFlags.FIXED);
this._items = [];
this._toplevels = global.window_group.get_children();
global.stage.add_actor(this.actor);
// Dark translucent window used to cover all but the
// currently-selected window while Alt-Tabbing. Actually
// contains four actors which can we rearrange to create
// a hole in the overlay.
this._overlay = new Clutter.Group({ reactive: true });
this._overlay_top = new Clutter.Rectangle({ color: OVERLAY_COLOR,
border_width: 0 });
this._overlay_bottom = new Clutter.Rectangle({ color: OVERLAY_COLOR,
border_width: 0 });
this._overlay_left = new Clutter.Rectangle({ color: OVERLAY_COLOR,
border_width: 0 });
this._overlay_right = new Clutter.Rectangle({ color: OVERLAY_COLOR,
border_width: 0 });
this._overlay.add_actor(this._overlay_top);
this._overlay.add_actor(this._overlay_bottom);
this._overlay.add_actor(this._overlay_left);
this._overlay.add_actor(this._overlay_right);
},
addWindow : function(win) {
let item = { window: win,
metaWindow: win.get_meta_window() };
let pixbuf = item.metaWindow.icon;
item.icon = new Clutter.Texture({ width: POPUP_ICON_SIZE,
height: POPUP_ICON_SIZE,
keep_aspect_ratio: true });
Shell.clutter_texture_set_from_pixbuf(item.icon, pixbuf);
item.box = new Big.Box({ padding: POPUP_INDICATOR_WIDTH * 2 });
item.box.append(item.icon, Big.BoxPackFlags.NONE);
item.above = null;
for (let i = 1; i < this._toplevels.length; i++) {
if (this._toplevels[i] == win) {
item.above = this._toplevels[i - 1];
break;
}
}
item.visible = item.metaWindow.showing_on_its_workspace();
if (!item.visible) {
let rect = new Meta.Rectangle();
if (item.metaWindow.get_icon_geometry(rect))
item.icon_rect = rect;
}
item.n = this._items.length;
this._items.push(item);
// Add it to the grid
if (!this._gridRow || this._gridRow.get_children().length == POPUP_NUM_COLUMNS) {
this._gridRow = new Big.Box({ spacing: POPUP_GRID_SPACING,
orientation: Big.BoxOrientation.HORIZONTAL });
this._grid.append(this._gridRow, Big.BoxPackFlags.NONE);
}
this._gridRow.append(item.box, Big.BoxPackFlags.NONE);
},
show : function(initialSelection) {
let global = Shell.Global.get();
global.window_group.add_actor(this._overlay);
this._overlay.raise_top();
this._overlay.show();
this.actor.opacity = 0;
Tweener.addTween(this.actor, { opacity: 255,
time: SHOW_TIME,
transition: "easeOutQuad" });
this.actor.show_all();
this.actor.x = Math.floor((global.screen_width - this.actor.width) / 2);
this.actor.y = Math.floor((global.screen_height - this.actor.height) / 2);
this.select(initialSelection);
},
destroy : function() {
this.actor.destroy();
this._overlay.destroy();
},
select : function(n) {
if (this._selected) {
// Unselect previous
if (this._allocationChangedId) {
this._selected.box.disconnect(this._allocationChangedId);
delete this._allocationChangedId;
}
if (this._selected.above)
this._selected.window.raise(this._selected.above);
else
this._selected.window.lower_bottom();
}
let item = this._items[n];
let changed = this._selected && item != this._selected;
this._selected = item;
if (this._selected) {
this._label.set_size(-1, -1);
this._label.text = this._selected.metaWindow.title;
if (this._label.width > POPUP_LABEL_MAX_WIDTH)
this._label.width = POPUP_LABEL_MAX_WIDTH;
// Figure out this._selected.box's coordinates in terms of
// this.actor
let bx = this._selected.box.x, by = this._selected.box.y;
let actor = this._selected.box.get_parent();
while (actor != this.actor) {
bx += actor.x;
by += actor.y;
actor = actor.get_parent();
}
if (changed) {
Tweener.addTween(this._indicator,
{ x: bx,
y: by,
width: this._selected.box.width,
height: this._selected.box.height,
time: SWITCH_TIME,
transition: "easeOutQuad" });
} else {
Tweener.removeTweens(this.indicator);
this._indicator.set_position(bx, by);
this._indicator.set_size(this._selected.box.width,
this._selected.box.height);
}
this._indicator.show();
if (this._overlay.visible) {
if (this._selected.visible)
this._selected.window.raise(this._overlay);
this._adjust_overlay();
}
this._allocationChangedId =
this._selected.box.connect('notify::allocation',
Lang.bind(this, this._allocationChanged));
} else {
this._label.text = "";
this._indicator.hide();
}
},
_allocationChanged : function() {
if (this._selected)
this.select(this._selected.n);
},
_adjust_overlay : function() {
let global = Shell.Global.get();
if (this._selected && this._selected.icon_rect) {
// We want to highlight a specific rectangle within the
// task bar, so rearrange the pieces of the overlay to
// cover the whole screen except that rectangle
let rect = this._selected.icon_rect;
this._overlay_top.x = 0;
this._overlay_top.y = 0;
this._overlay_top.width = global.screen_width;
this._overlay_top.height = rect.y;
this._overlay_left.x = 0;
this._overlay_left.y = rect.y;
this._overlay_left.width = rect.x;
this._overlay_left.height = rect.height;
this._overlay_left.show();
this._overlay_right.x = rect.x + rect.width;
this._overlay_right.y = rect.y;
this._overlay_right.width = global.screen_width - rect.x - rect.width;
this._overlay_right.height = rect.height;
this._overlay_right.show();
this._overlay_bottom.x = 0;
this._overlay_bottom.y = rect.y + rect.height;
this._overlay_bottom.width = global.screen_width;
this._overlay_bottom.height = global.screen_height - rect.y - rect.height;
this._overlay_bottom.show();
} else {
// Either there's no current selection, or the selection
// is a visible window. Make the overlay cover the whole
// screen. select() will raise the selected window over
// the overlay.
this._overlay_top.x = 0;
this._overlay_top.y = 0;
this._overlay_top.width = global.screen_width;
this._overlay_top.height = global.screen_height;
this._overlay_top.show();
this._overlay_left.hide();
this._overlay_right.hide();
this._overlay_bottom.hide();
}
}
};