blob: 0f66bd3c3a02e6d69ce4ac51ced570eba95b1234 [file] [log] [blame]
/*
* Copyright (C) 2016-2017 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 Button extends LayoutItem
{
constructor({ layoutDelegate = null, cssClassName = "", iconName = "" } = {})
{
super({
element: "<button />",
layoutDelegate
});
if (!!cssClassName)
this.element.classList.add(cssClassName);
this.style = Button.Styles.Bar;
this.image = this.addChild(new LayoutNode(`<picture></picture>`));
this._scaleFactor = 1;
this._imageSource = null;
this._iconName = "";
if (!!iconName)
this.iconName = iconName;
this._enabled = true;
if (GestureRecognizer.SupportsTouches)
this._tapGestureRecognizer = new TapGestureRecognizer(this.element, this);
else
this.element.addEventListener("click", this);
}
// Public
get enabled()
{
return this._enabled;
}
set enabled(flag)
{
if (this._enabled === flag)
return;
this._enabled = flag;
if (this.layoutDelegate && typeof this.layoutDelegate.layout === "function")
this.layoutDelegate.layout();
}
get iconName()
{
return this._iconName;
}
set iconName(iconName)
{
if (this._iconName === iconName)
return;
this._loadImage(iconName);
this.element.setAttribute("aria-label", iconName.label);
}
get on()
{
return this.element.classList.contains("on");
}
set on(flag) {
this.element.classList.toggle("on", flag);
}
get style()
{
return this._style;
}
set style(style)
{
if (style === this._style)
return;
this.element.classList.remove(this._style);
this.element.classList.add(style);
this._style = style;
if (style === Button.Styles.Bar && this.children.length == 2)
this.children[0].remove();
else if (this.children.length == 1)
this.addChild(new BackgroundTint, 0);
}
get scaleFactor()
{
return this._scaleFactor;
}
set scaleFactor(scaleFactor)
{
if (this._scaleFactor === scaleFactor)
return;
this._scaleFactor = scaleFactor;
this._updateImageMetrics();
}
// Protected
handleEvent(event)
{
if (event.target === this._imageSource) {
if (event.type === "load")
this._imageSourceDidLoad();
else if (event.type === "error")
console.error(`Button failed to load, iconName = ${this._iconName.name}, layoutTraits = ${this.layoutTraits}, src = ${this._imageSource.src}`);
} else if (event.type === "click" && event.currentTarget === this.element)
this._notifyDelegateOfActivation();
}
gestureRecognizerStateDidChange(recognizer)
{
if (this._tapGestureRecognizer === recognizer && recognizer.state === GestureRecognizer.States.Recognized)
this._notifyDelegateOfActivation();
}
commitProperty(propertyName)
{
if (propertyName === "maskImage")
this.image.element.style.webkitMaskImage = `url(${this._imageSource.src})`;
else
super.commitProperty(propertyName);
}
// Private
_notifyDelegateOfActivation()
{
if (this._enabled && this.uiDelegate && typeof this.uiDelegate.buttonWasPressed === "function")
this.uiDelegate.buttonWasPressed(this);
}
_loadImage(iconName)
{
if (this._imageSource)
this._imageSource.removeEventListener("load", this);
this._imageSource = iconService.imageForIconAndLayoutTraits(iconName, this.layoutTraits);
this._iconName = iconName;
if (this._imageSource.complete)
this._updateImage();
else {
this._imageSource.addEventListener("load", this);
this._imageSource.addEventListener("error", this);
}
}
_imageSourceDidLoad()
{
this._imageSource.removeEventListener("load", this);
this._updateImage();
}
_updateImage()
{
this.markDirtyProperty("maskImage");
this._updateImageMetrics();
}
_updateImageMetrics()
{
let width = this._imageSource.width * this._scaleFactor;
let height = this._imageSource.height * this._scaleFactor;
if (this._iconName.type === "png" || this._iconName.type === "pdf") {
width /= window.devicePixelRatio;
height /= window.devicePixelRatio;
}
if (this.image.width === width && this.image.height === height)
return;
this.image.width = width;
this.image.height = height;
this.width = width;
this.height = height;
if (this.layoutDelegate)
this.layoutDelegate.needsLayout = true;
}
}
Button.Styles = {
Bar: "bar",
Corner: "corner",
Center: "center",
SmallCenter: "small-center"
};