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Add a wrapper around tweener to do some extra integration

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Automatically removes tweens on destroyed actors, and provides
additional "animation started/stopped" callbacks (eg, for tracking
whether or not to show window clone titles)
This commit is contained in:
Dan Winship
2009-02-10 11:12:58 -05:00
parent 7d474b2217
commit e79c776c2e
6 changed files with 305 additions and 146 deletions
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76
js/ui/main.js
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@ -5,11 +5,11 @@ const Gio = imports.gi.Gio;
const Mainloop = imports.mainloop;
const Shell = imports.gi.Shell;
const Signals = imports.signals;
const Tweener = imports.tweener.tweener;
const Overlay = imports.ui.overlay;
const Panel = imports.ui.panel;
const RunDialog = imports.ui.runDialog;
const Tweener = imports.ui.tweener;
const WindowManager = imports.ui.windowManager;
const DEFAULT_BACKGROUND_COLOR = new Clutter.Color();
@ -21,78 +21,6 @@ let overlayActive = false;
let runDialog = null;
let wm = null;
// The "FrameTicker" object is an object used to feed new frames to Tweener
// so it can update values and redraw. The default frame ticker for
// Tweener just uses a simple timeout at a fixed frame rate and has no idea
// of "catching up" by dropping frames.
//
// We substitute it with custom frame ticker here that connects Tweener to
// a Clutter.TimeLine. Now, Clutter.Timeline itself isn't a whole lot more
// sophisticated than a simple timeout at a fixed frame rate, but at least
// it knows how to drop frames. (See HippoAnimationManager for a more
// sophisticated view of continous time updates; even better is to pay
// attention to the vertical vblank and sync to that when possible.)
//
function ClutterFrameTicker() {
this._init();
}
ClutterFrameTicker.prototype = {
FRAME_RATE : 60,
_init : function() {
// We don't have a finite duration; tweener will tell us to stop
// when we need to stop, so use 1000 seconds as "infinity"
this._timeline = new Clutter.Timeline({ fps: this.FRAME_RATE,
duration: 1000*1000 });
this._currentTime = 0;
this._frame = 0;
let me = this;
this._timeline.connect('new-frame',
function(timeline, frame) {
me._onNewFrame(frame);
});
},
_onNewFrame : function(frame) {
// If there is a lot of setup to start the animation, then
// first frame number we get from clutter might be a long ways
// into the animation (or the animation might even be done).
// That looks bad, so we always start one frame into the
// animation then only do frame dropping from there.
let delta;
if (this._frame == 0)
delta = 1;
else
delta = frame - this._frame;
if (delta == 0) // protect against divide-by-0 if we get a frame twice
delta = 1;
// currentTime is in milliseconds
this._currentTime += (1000 * delta) / this.FRAME_RATE;
this._frame = frame;
this.emit('prepare-frame');
},
getTime : function() {
return this._currentTime;
},
start : function() {
this._timeline.start();
},
stop : function() {
this._timeline.stop();
this._frame = 0;
this._currentTime = 0;
}
};
Signals.addSignalMethods(ClutterFrameTicker.prototype);
function start() {
let global = Shell.Global.get();
@ -101,7 +29,7 @@ function start() {
global.grab_dbus_service();
global.start_task_panel();
Tweener.setFrameTicker(new ClutterFrameTicker());
Tweener.init();
// The background color really only matters if there is no desktop
// window (say, nautilus) running. We set it mostly so things look good