gnome-shell/js/ui/pointerA11yTimeout.js

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/* exported PointerA11yTimeout */
const { Clutter, GLib, GObject, Meta, St } = imports.gi;
const Tweener = imports.ui.tweener;
const Main = imports.ui.main;
const Cairo = imports.cairo;
var PieTimer = GObject.registerClass(
class PieTimer extends St.DrawingArea {
_init() {
this._x = 0;
this._y = 0;
this._startTime = 0;
this._duration = 0;
super._init( { style_class: 'pie-timer',
visible: false,
can_focus: false,
reactive: false });
}
vfunc_repaint() {
let node = this.get_theme_node();
let backgroundColor = node.get_color('-pie-background-color');
let borderColor = node.get_color('-pie-border-color');
let borderWidth = node.get_length('-pie-border-width');
let [width, height] = this.get_surface_size();
let radius = Math.min(width / 2, height / 2);
let currentTime = GLib.get_monotonic_time() / 1000.0;
let ellapsed = currentTime - this._startTime;
let angle = (ellapsed / this._duration) * 2 * Math.PI;
let startAngle = 3 * Math.PI / 2;
let endAngle = startAngle + angle;
let cr = this.get_context();
cr.setLineCap(Cairo.LineCap.ROUND);
cr.setLineJoin(Cairo.LineJoin.ROUND);
cr.translate(width / 2, height / 2);
cr.moveTo(0, 0);
cr.arc(0, 0, radius - borderWidth, startAngle, endAngle);
cr.lineTo(0, 0);
cr.closePath();
cr.setLineWidth(0);
Clutter.cairo_set_source_color(cr, backgroundColor);
cr.fillPreserve();
cr.setLineWidth(borderWidth);
Clutter.cairo_set_source_color(cr, borderColor);
cr.stroke();
cr.$dispose();
}
start(x, y, duration) {
Tweener.removeTweens(this);
this.x = x - this.width / 2;
this.y = y - this.height / 2;
this.show();
Main.uiGroup.set_child_above_sibling(this, null);
this._startTime = GLib.get_monotonic_time() / 1000.0;
this._duration = duration;
Tweener.addTween(this,
{ opacity: 255,
time: duration / 1000,
transition: 'easeOutQuad',
onUpdate: () => this.queue_repaint(),
onComplete: () => this.stop()
});
}
stop() {
Tweener.removeTweens(this);
this.hide();
}
});
var PointerA11yTimeout = class PointerA11yTimeout {
constructor() {
let manager = Clutter.DeviceManager.get_default();
let pieTimer = new PieTimer();
Main.uiGroup.add_actor(pieTimer);
manager.connect('ptr-a11y-timeout-started', (manager, device, type, timeout) => {
let [x, y] = global.get_pointer();
pieTimer.start(x, y, timeout);
if (type == Clutter.PointerA11yTimeoutType.GESTURE)
global.display.set_cursor(Meta.Cursor.CROSSHAIR);
});
manager.connect('ptr-a11y-timeout-stopped', (manager, device, type) => {
pieTimer.stop();
if (type == Clutter.PointerA11yTimeoutType.GESTURE)
global.display.set_cursor(Meta.Cursor.DEFAULT);
});
}
};