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<title>The source code</title>
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<pre class="prettyprint lang-js">/*!
* Ext JS Library 3.4.0
* Copyright(c) 2006-2011 Sencha Inc.
* licensing@sencha.com
* http://www.sencha.com/license
*/
<div id="cls-Ext.layout.AnchorLayout"></div>/**
* @class Ext.layout.AnchorLayout
* @extends Ext.layout.ContainerLayout
* <p>This is a layout that enables anchoring of contained elements relative to the container's dimensions.
* If the container is resized, all anchored items are automatically rerendered according to their
* <b><tt>{@link #anchor}</tt></b> rules.</p>
* <p>This class is intended to be extended or created via the layout:'anchor' {@link Ext.Container#layout}
* config, and should generally not need to be created directly via the new keyword.</p>
* <p>AnchorLayout does not have any direct config options (other than inherited ones). By default,
* AnchorLayout will calculate anchor measurements based on the size of the container itself. However, the
* container using the AnchorLayout can supply an anchoring-specific config property of <b>anchorSize</b>.
* If anchorSize is specifed, the layout will use it as a virtual container for the purposes of calculating
* anchor measurements based on it instead, allowing the container to be sized independently of the anchoring
* logic if necessary. For example:</p>
* <pre><code>
var viewport = new Ext.Viewport({
layout:'anchor',
anchorSize: {width:800, height:600},
items:[{
title:'Item 1',
html:'Content 1',
width:800,
anchor:'right 20%'
},{
title:'Item 2',
html:'Content 2',
width:300,
anchor:'50% 30%'
},{
title:'Item 3',
html:'Content 3',
width:600,
anchor:'-100 50%'
}]
});
* </code></pre>
*/
Ext.layout.AnchorLayout = Ext.extend(Ext.layout.ContainerLayout, {
<div id="cfg-Ext.layout.AnchorLayout-anchor"></div>/**
* @cfg {String} anchor
* <p>This configuation option is to be applied to <b>child <tt>items</tt></b> of a container managed by
* this layout (ie. configured with <tt>layout:'anchor'</tt>).</p><br/>
*
* <p>This value is what tells the layout how an item should be anchored to the container. <tt>items</tt>
* added to an AnchorLayout accept an anchoring-specific config property of <b>anchor</b> which is a string
* containing two values: the horizontal anchor value and the vertical anchor value (for example, '100% 50%').
* The following types of anchor values are supported:<div class="mdetail-params"><ul>
*
* <li><b>Percentage</b> : Any value between 1 and 100, expressed as a percentage.<div class="sub-desc">
* The first anchor is the percentage width that the item should take up within the container, and the
* second is the percentage height. For example:<pre><code>
// two values specified
anchor: '100% 50%' // render item complete width of the container and
// 1/2 height of the container
// one value specified
anchor: '100%' // the width value; the height will default to auto
* </code></pre></div></li>
*
* <li><b>Offsets</b> : Any positive or negative integer value.<div class="sub-desc">
* This is a raw adjustment where the first anchor is the offset from the right edge of the container,
* and the second is the offset from the bottom edge. For example:<pre><code>
// two values specified
anchor: '-50 -100' // render item the complete width of the container
// minus 50 pixels and
// the complete height minus 100 pixels.
// one value specified
anchor: '-50' // anchor value is assumed to be the right offset value
// bottom offset will default to 0
* </code></pre></div></li>
*
* <li><b>Sides</b> : Valid values are <tt>'right'</tt> (or <tt>'r'</tt>) and <tt>'bottom'</tt>
* (or <tt>'b'</tt>).<div class="sub-desc">
* Either the container must have a fixed size or an anchorSize config value defined at render time in
* order for these to have any effect.</div></li>
*
* <li><b>Mixed</b> : <div class="sub-desc">
* Anchor values can also be mixed as needed. For example, to render the width offset from the container
* right edge by 50 pixels and 75% of the container's height use:
* <pre><code>
anchor: '-50 75%'
* </code></pre></div></li>
*
*
* </ul></div>
*/
// private
monitorResize : true,
type : 'anchor',
<div id="cfg-Ext.layout.AnchorLayout-defaultAnchor"></div>/**
* @cfg {String} defaultAnchor
*
* default anchor for all child container items applied if no anchor or specific width is set on the child item. Defaults to '100%'.
*
*/
defaultAnchor : '100%',
parseAnchorRE : /^(r|right|b|bottom)$/i,
getLayoutTargetSize : function() {
var target = this.container.getLayoutTarget(), ret = {};
if (target) {
ret = target.getViewSize();
// IE in strict mode will return a width of 0 on the 1st pass of getViewSize.
// Use getStyleSize to verify the 0 width, the adjustment pass will then work properly
// with getViewSize
if (Ext.isIE && Ext.isStrict && ret.width == 0){
ret = target.getStyleSize();
}
ret.width -= target.getPadding('lr');
ret.height -= target.getPadding('tb');
}
return ret;
},
// private
onLayout : function(container, target) {
Ext.layout.AnchorLayout.superclass.onLayout.call(this, container, target);
var size = this.getLayoutTargetSize(),
containerWidth = size.width,
containerHeight = size.height,
overflow = target.getStyle('overflow'),
components = this.getRenderedItems(container),
len = components.length,
boxes = [],
box,
anchorWidth,
anchorHeight,
component,
anchorSpec,
calcWidth,
calcHeight,
anchorsArray,
totalHeight = 0,
i,
el;
if(containerWidth < 20 && containerHeight < 20){
return;
}
// find the container anchoring size
if(container.anchorSize) {
if(typeof container.anchorSize == 'number') {
anchorWidth = container.anchorSize;
} else {
anchorWidth = container.anchorSize.width;
anchorHeight = container.anchorSize.height;
}
} else {
anchorWidth = container.initialConfig.width;
anchorHeight = container.initialConfig.height;
}
for(i = 0; i < len; i++) {
component = components[i];
el = component.getPositionEl();
// If a child container item has no anchor and no specific width, set the child to the default anchor size
if (!component.anchor && component.items && !Ext.isNumber(component.width) && !(Ext.isIE6 && Ext.isStrict)){
component.anchor = this.defaultAnchor;
}
if(component.anchor) {
anchorSpec = component.anchorSpec;
// cache all anchor values
if(!anchorSpec){
anchorsArray = component.anchor.split(' ');
component.anchorSpec = anchorSpec = {
right: this.parseAnchor(anchorsArray[0], component.initialConfig.width, anchorWidth),
bottom: this.parseAnchor(anchorsArray[1], component.initialConfig.height, anchorHeight)
};
}
calcWidth = anchorSpec.right ? this.adjustWidthAnchor(anchorSpec.right(containerWidth) - el.getMargins('lr'), component) : undefined;
calcHeight = anchorSpec.bottom ? this.adjustHeightAnchor(anchorSpec.bottom(containerHeight) - el.getMargins('tb'), component) : undefined;
if(calcWidth || calcHeight) {
boxes.push({
component: component,
width: calcWidth || undefined,
height: calcHeight || undefined
});
}
}
}
for (i = 0, len = boxes.length; i < len; i++) {
box = boxes[i];
box.component.setSize(box.width, box.height);
}
if (overflow && overflow != 'hidden' && !this.adjustmentPass) {
var newTargetSize = this.getLayoutTargetSize();
if (newTargetSize.width != size.width || newTargetSize.height != size.height){
this.adjustmentPass = true;
this.onLayout(container, target);
}
}
delete this.adjustmentPass;
},
// private
parseAnchor : function(a, start, cstart) {
if (a && a != 'none') {
var last;
// standard anchor
if (this.parseAnchorRE.test(a)) {
var diff = cstart - start;
return function(v){
if(v !== last){
last = v;
return v - diff;
}
};
// percentage
} else if(a.indexOf('%') != -1) {
var ratio = parseFloat(a.replace('%', ''))*.01;
return function(v){
if(v !== last){
last = v;
return Math.floor(v*ratio);
}
};
// simple offset adjustment
} else {
a = parseInt(a, 10);
if (!isNaN(a)) {
return function(v) {
if (v !== last) {
last = v;
return v + a;
}
};
}
}
}
return false;
},
// private
adjustWidthAnchor : function(value, comp){
return value;
},
// private
adjustHeightAnchor : function(value, comp){
return value;
}
<div id="prop-Ext.layout.AnchorLayout-activeItem"></div>/**
* @property activeItem
* @hide
*/
});
Ext.Container.LAYOUTS['anchor'] = Ext.layout.AnchorLayout;
</pre>
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