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<!DOCTYPE html>
<!--
Copyright (c) 2014 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.
-->
<link rel="import" href="/tracing/ui/base/ui.html">
<polymer-element name="tr-ui-b-drag-handle">
<template>
<style>
:host {
-webkit-user-select: none;
box-sizing: border-box;
display: block;
}
:host(.horizontal-drag-handle) {
background-image: -webkit-gradient(linear,
0 0, 0 100%,
from(#E5E5E5),
to(#D1D1D1));
border-bottom: 1px solid #8e8e8e;
border-top: 1px solid white;
cursor: ns-resize;
flex: 0 0 auto;
height: 7px;
position: relative;
}
:host(.vertical-drag-handle) {
background-image: -webkit-gradient(linear,
0 0, 100% 0,
from(#E5E5E5),
to(#D1D1D1));
border-left: 1px solid white;
border-right: 1px solid #8e8e8e;
cursor: ew-resize;
flex: 0 0 auto;
position: relative;
width: 7px;
}
</style>
</template>
<script>
'use strict';
Polymer({
__proto__: HTMLDivElement.prototype,
created: 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.nextElementSibling) {
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();
}
});
</script>
</polymer-element>
|
