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// Copyright (c) 2011 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.
/**
* This view implements a vertically split display with a draggable divider.
*
* <<-- sizer -->>
*
* +----------------------++----------------+
* | || |
* | || |
* | || |
* | || |
* | leftView || rightView |
* | || |
* | || |
* | || |
* | || |
* | || |
* +----------------------++----------------+
*
* @param {!View} leftView The widget to position on the left.
* @param {!View} rightView The widget to position on the right.
* @param {!DivView} sizerView The widget that will serve as draggable divider.
*/
var ResizableVerticalSplitView = (function() {
'use strict';
// Minimum width to size panels to, in pixels.
var MIN_PANEL_WIDTH = 50;
// We inherit from View.
var superClass = View;
/**
* @constructor
*/
function ResizableVerticalSplitView(leftView, rightView, sizerView) {
// Call superclass's constructor.
superClass.call(this);
this.leftView_ = leftView;
this.rightView_ = rightView;
this.sizerView_ = sizerView;
// Setup the "sizer" so it can be dragged left/right to reposition the
// vertical split.
sizerView.getNode().addEventListener(
'mousedown', this.onDragSizerStart_.bind(this), true);
}
ResizableVerticalSplitView.prototype = {
// Inherit the superclass's methods.
__proto__: superClass.prototype,
/**
* Sets the width of the left view.
* @param {Integer} px The number of pixels
*/
setLeftSplit: function(px) {
this.leftSplit_ = px;
},
/**
* Repositions all of the elements to fit the window.
*/
setGeometry: function(left, top, width, height) {
superClass.prototype.setGeometry.call(this, left, top, width, height);
// If this is the first setGeometry(), initialize the split point at 50%.
if (!this.leftSplit_)
this.leftSplit_ = parseInt((width / 2).toFixed(0));
// Calculate the horizontal split points.
var leftboxWidth = this.leftSplit_;
var sizerWidth = this.sizerView_.getWidth();
var rightboxWidth = width - (leftboxWidth + sizerWidth);
// Don't let the right pane get too small.
if (rightboxWidth < MIN_PANEL_WIDTH) {
rightboxWidth = MIN_PANEL_WIDTH;
leftboxWidth = width - (sizerWidth + rightboxWidth);
}
// Position the boxes using calculated split points.
this.leftView_.setGeometry(left, top, leftboxWidth, height);
this.sizerView_.setGeometry(this.leftView_.getRight(), top,
sizerWidth, height);
this.rightView_.setGeometry(this.sizerView_.getRight(), top,
rightboxWidth, height);
},
show: function(isVisible) {
superClass.prototype.show.call(this, isVisible);
this.leftView_.show(isVisible);
this.sizerView_.show(isVisible);
this.rightView_.show(isVisible);
},
/**
* Called once we have clicked into the sizer. Starts capturing the mouse
* position to implement dragging.
*/
onDragSizerStart_: function(event) {
this.sizerMouseMoveListener_ = this.onDragSizer_.bind(this);
this.sizerMouseUpListener_ = this.onDragSizerEnd_.bind(this);
window.addEventListener('mousemove', this.sizerMouseMoveListener_, true);
window.addEventListener('mouseup', this.sizerMouseUpListener_, true);
event.preventDefault();
},
/**
* Called when the mouse has moved after dragging started.
*/
onDragSizer_: function(event) {
// Convert from page coordinates, to view coordinates.
this.leftSplit_ = (event.pageX - this.getLeft());
// Avoid shrinking the left box too much.
this.leftSplit_ = Math.max(this.leftSplit_, MIN_PANEL_WIDTH);
// Avoid shrinking the right box too much.
this.leftSplit_ = Math.min(
this.leftSplit_, this.getWidth() - MIN_PANEL_WIDTH);
// Force a layout with the new |leftSplit_|.
this.setGeometry(
this.getLeft(), this.getTop(), this.getWidth(), this.getHeight());
},
/**
* Called once the mouse has been released, and the dragging is over.
*/
onDragSizerEnd_: function(event) {
window.removeEventListener(
'mousemove', this.sizerMouseMoveListener_, true);
window.removeEventListener('mouseup', this.sizerMouseUpListener_, true);
this.sizerMouseMoveListener_ = null;
this.sizerMouseUpListener_ = null;
event.preventDefault();
}
};
return ResizableVerticalSplitView;
})();
|
