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/*
* Ext JS Library 2.0.2
* Copyright(c) 2006-2008, Ext JS, LLC.
* licensing@extjs.com
*
* http://extjs.com/license
*/
/**
* @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 anchor rules.
* 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). However, the container
* using the AnchorLayout can supply an anchoring-specific config property of <b>anchorSize</b>. By default,
* AnchorLayout will calculate anchor measurements based on the size of the container itself. However, 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.</p>
* <p>The items added to an AnchorLayout can also supply 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%').
* This value is what tells the layout how the item should be anchored to the container. The following types of
* anchor values are supported:
* <ul>
* <li><b>Percentage</b>: Any value between 1 and 100, expressed as a percentage. The first anchor is the percentage
* width that the item should take up within the container, and the second is the percentage height. Example: '100% 50%'
* would render an item the complete width of the container and 1/2 its height. If only one anchor value is supplied
* it is assumed to be the width value and the height will default to auto.</li>
* <li><b>Offsets</b>: Any positive or negative integer value. The first anchor is the offset from the right edge of
* the container, and the second is the offset from the bottom edge. Example: '-50 -100' would render an item the
* complete width of the container minus 50 pixels and the complete height minus 100 pixels. If only one anchor value
* is supplied it is assumed to be the right offset value and the bottom offset will default to 0.</li>
* <li><b>Sides</b>: Valid values are 'right' (or 'r') and 'bottom' (or 'b'). 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.</li>
* </ul>
* <p>Anchor values can also be mixed as needed. For example, '-50 75%' would render the width offset from the
* container right edge by 50 pixels and 75% of the container's height.</p>
*/
Ext.layout.AnchorLayout = Ext.extend(Ext.layout.ContainerLayout, {
// private
monitorResize:true,
// private
getAnchorViewSize : function(ct, target){
return target.dom == document.body ?
target.getViewSize() : target.getStyleSize();
},
// private
onLayout : function(ct, target){
Ext.layout.AnchorLayout.superclass.onLayout.call(this, ct, target);
var size = this.getAnchorViewSize(ct, target);
var w = size.width, h = size.height;
if(w < 20 || h < 20){
return;
}
// find the container anchoring size
var aw, ah;
if(ct.anchorSize){
if(typeof ct.anchorSize == 'number'){
aw = ct.anchorSize;
}else{
aw = ct.anchorSize.width;
ah = ct.anchorSize.height;
}
}else{
aw = ct.initialConfig.width;
ah = ct.initialConfig.height;
}
var cs = ct.items.items, len = cs.length, i, c, a, cw, ch;
for(i = 0; i < len; i++){
c = cs[i];
if(c.anchor){
a = c.anchorSpec;
if(!a){ // cache all anchor values
var vs = c.anchor.split(' ');
c.anchorSpec = a = {
right: this.parseAnchor(vs[0], c.initialConfig.width, aw),
bottom: this.parseAnchor(vs[1], c.initialConfig.height, ah)
};
}
cw = a.right ? this.adjustWidthAnchor(a.right(w), c) : undefined;
ch = a.bottom ? this.adjustHeightAnchor(a.bottom(h), c) : undefined;
if(cw || ch){
c.setSize(cw || undefined, ch || undefined);
}
}
}
},
// private
parseAnchor : function(a, start, cstart){
if(a && a != 'none'){
var last;
if(/^(r|right|b|bottom)$/i.test(a)){ // standard anchor
var diff = cstart - start;
return function(v){
if(v !== last){
last = v;
return v - diff;
}
}
}else if(a.indexOf('%') != -1){
var ratio = parseFloat(a.replace('%', ''))*.01; // percentage
return function(v){
if(v !== last){
last = v;
return Math.floor(v*ratio);
}
}
}else{
a = parseInt(a, 10);
if(!isNaN(a)){ // simple offset adjustment
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;
}
/**
* @property activeItem
* @hide
*/
});
Ext.Container.LAYOUTS['anchor'] = Ext.layout.AnchorLayout;