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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
'use strict';
base.require('ui');
base.requireStylesheet('ui.drag_handle');
base.exportTo('ui', function() {
/**
* Detects when user clicks handle determines new height of container based
* on user's vertical mouse move and resizes the target.
* @constructor
* @extends {HTMLDivElement}
* You will need to set target to be the draggable element
*/
var DragHandle = ui.define('x-drag-handle');
DragHandle.prototype = {
__proto__: HTMLDivElement.prototype,
decorate: function() {
this.lastMousePos_ = 0;
this.onMouseMove_ = this.onMouseMove_.bind(this);
this.onMouseUp_ = this.onMouseUp_.bind(this);
this.addEventListener('mousedown', this.onMouseDown_);
this.target_ = undefined;
this.horizontal = true;
this.observer_ = new WebKitMutationObserver(
this.didTargetMutate_.bind(this));
this.targetSizesByModeKey_ = {};
},
get modeKey_() {
return this.target_.className == '' ? '.' : this.target_.className;
},
get target() {
return this.target_;
},
set target(target) {
this.observer_.disconnect();
this.target_ = target;
if (!this.target_)
return;
this.observer_.observe(this.target_, {
attributes: true,
attributeFilter: ['class']
});
},
get horizontal() {
return this.horizontal_;
},
set horizontal(h) {
this.horizontal_ = h;
if (this.horizontal_)
this.className = 'horizontal-drag-handle';
else
this.className = 'vertical-drag-handle';
},
get vertical() {
return !this.horizontal_;
},
set vertical(v) {
this.horizontal = !v;
},
forceMutationObserverFlush_: function() {
var records = this.observer_.takeRecords();
if (records.length)
this.didTargetMutate_(records);
},
didTargetMutate_: function(e) {
var modeSize = this.targetSizesByModeKey_[this.modeKey_];
if (modeSize !== undefined) {
this.setTargetSize_(modeSize);
return;
}
// If we hadn't previously sized the target, then just remove any manual
// sizing that we applied.
this.target_.style[this.targetStyleKey_] = '';
},
get targetStyleKey_() {
return this.horizontal_ ? 'height' : 'width';
},
getTargetSize_: function() {
// If style is not set, start off with computed height.
var targetStyleKey = this.targetStyleKey_;
if (!this.target_.style[targetStyleKey]) {
this.target_.style[targetStyleKey] =
window.getComputedStyle(this.target_)[targetStyleKey];
}
var size = parseInt(this.target_.style[targetStyleKey]);
this.targetSizesByModeKey_[this.modeKey_] = size;
return size;
},
setTargetSize_: function(s) {
this.target_.style[this.targetStyleKey_] = s + 'px';
this.targetSizesByModeKey_[this.modeKey_] = s;
},
applyDelta_: function(delta) {
// Apply new size to the container.
var curSize = this.getTargetSize_();
var newSize;
if (this.target_ === this.nextSibling) {
newSize = curSize + delta;
} else {
newSize = curSize - delta;
}
this.setTargetSize_(newSize);
},
onMouseMove_: function(e) {
// Compute the difference in height position.
var curMousePos = this.horizontal_ ? e.clientY : e.clientX;
var delta = this.lastMousePos_ - curMousePos;
this.applyDelta_(delta);
this.lastMousePos_ = curMousePos;
e.preventDefault();
return true;
},
onMouseDown_: function(e) {
if (!this.target_)
return;
this.forceMutationObserverFlush_();
this.lastMousePos_ = this.horizontal_ ? e.clientY : e.clientX;
document.addEventListener('mousemove', this.onMouseMove_);
document.addEventListener('mouseup', this.onMouseUp_);
e.preventDefault();
return true;
},
onMouseUp_: function(e) {
document.removeEventListener('mousemove', this.onMouseMove_);
document.removeEventListener('mouseup', this.onMouseUp_);
e.preventDefault();
}
};
return {
DragHandle: DragHandle
};
});
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