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/*
* Copyright (C) 2016 Apple Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
class VolumeSlider extends Slider
{
constructor(layoutDelegate)
{
super({
cssClassName: "volume",
layoutDelegate
});
this.height = 11;
this.enabled = true;
this._active = false;
this.element.addEventListener("mousedown", this);
}
// Protected
handleEvent(event)
{
super.handleEvent(event);
if (event instanceof MouseEvent) {
this._active = event.type === "mousedown";
if (event.type === "mousedown")
window.addEventListener("mouseup", this, true);
else
window.removeEventListener("mouseup", this, true);
}
}
draw(ctx)
{
const width = this.width;
const height = this.height;
if (!this.width || !this.height)
return;
const dpr = window.devicePixelRatio;
ctx.save();
ctx.scale(dpr, dpr);
ctx.clearRect(0, 0, width, height);
const trackHeight = 3;
const knobRadius = 5.5;
const knobDiameter = 2 * knobRadius;
const borderSize = 2;
const knobX = Math.round(this.value * (width - knobDiameter - borderSize));
// Draw portion of volume under slider thumb.
ctx.save();
ctx.beginPath();
addRoundedRect(ctx, 0, 4, knobX + 2, trackHeight, trackHeight / 2);
ctx.closePath();
ctx.clip();
ctx.fillStyle = "rgb(84, 84, 84)";
ctx.fillRect(0, 0, width, height);
ctx.restore();
// Draw portion of volume above slider thumb.
ctx.save();
ctx.beginPath();
addRoundedRect(ctx, knobX, 4, width - knobX, trackHeight, trackHeight / 2);
ctx.closePath();
ctx.clip();
ctx.fillStyle = "rgb(39, 39, 39)";
ctx.fillRect(0, 0, width, height);
ctx.restore();
// Clear a hole in the slider for the scrubber.
ctx.save();
ctx.beginPath();
addRoundedRect(ctx, knobX, 0, knobDiameter + borderSize, height, (knobDiameter + borderSize) / 2);
ctx.closePath();
ctx.clip();
ctx.clearRect(0, 0, width, height);
ctx.restore();
// Draw scrubber.
ctx.save();
ctx.beginPath();
addRoundedRect(ctx, knobX + 1, 0, knobDiameter, knobDiameter, knobRadius);
ctx.closePath();
ctx.clip();
ctx.fillStyle = this._active ? "white" : "rgb(138, 138, 138)";
ctx.fillRect(0, 0, width, height);
ctx.restore();
ctx.restore();
}
}
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