3 * Copyright(c) 2006-2009 Ext JS, LLC
5 * http://www.extjs.com/license
8 * @class Ext.layout.AnchorLayout
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9 * @extends Ext.layout.ContainerLayout
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10 * <p>This is a layout that enables anchoring of contained elements relative to the container's dimensions.
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11 * If the container is resized, all anchored items are automatically rerendered according to their
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12 * <b><tt>{@link #anchor}</tt></b> rules.</p>
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13 * <p>This class is intended to be extended or created via the layout:'anchor' {@link Ext.Container#layout}
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14 * config, and should generally not need to be created directly via the new keyword.</p>
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15 * <p>AnchorLayout does not have any direct config options (other than inherited ones). By default,
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16 * AnchorLayout will calculate anchor measurements based on the size of the container itself. However, the
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17 * container using the AnchorLayout can supply an anchoring-specific config property of <b>anchorSize</b>.
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18 * If anchorSize is specifed, the layout will use it as a virtual container for the purposes of calculating
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19 * anchor measurements based on it instead, allowing the container to be sized independently of the anchoring
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20 * logic if necessary. For example:</p>
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22 var viewport = new Ext.Viewport({
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24 anchorSize: {width:800, height:600},
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44 Ext.layout.AnchorLayout = Ext.extend(Ext.layout.ContainerLayout, {
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46 * @cfg {String} anchor
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47 * <p>This configuation option is to be applied to <b>child <tt>items</tt></b> of a container managed by
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48 * this layout (ie. configured with <tt>layout:'anchor'</tt>).</p><br/>
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50 * <p>This value is what tells the layout how an item should be anchored to the container. <tt>items</tt>
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51 * added to an AnchorLayout accept an anchoring-specific config property of <b>anchor</b> which is a string
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52 * containing two values: the horizontal anchor value and the vertical anchor value (for example, '100% 50%').
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53 * The following types of anchor values are supported:<div class="mdetail-params"><ul>
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55 * <li><b>Percentage</b> : Any value between 1 and 100, expressed as a percentage.<div class="sub-desc">
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56 * The first anchor is the percentage width that the item should take up within the container, and the
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57 * second is the percentage height. For example:<pre><code>
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58 // two values specified
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59 anchor: '100% 50%' // render item complete width of the container and
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60 // 1/2 height of the container
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61 // one value specified
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62 anchor: '100%' // the width value; the height will default to auto
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63 * </code></pre></div></li>
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65 * <li><b>Offsets</b> : Any positive or negative integer value.<div class="sub-desc">
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66 * This is a raw adjustment where the first anchor is the offset from the right edge of the container,
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67 * and the second is the offset from the bottom edge. For example:<pre><code>
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68 // two values specified
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69 anchor: '-50 -100' // render item the complete width of the container
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70 // minus 50 pixels and
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71 // the complete height minus 100 pixels.
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72 // one value specified
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73 anchor: '-50' // anchor value is assumed to be the right offset value
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74 // bottom offset will default to 0
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75 * </code></pre></div></li>
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77 * <li><b>Sides</b> : Valid values are <tt>'right'</tt> (or <tt>'r'</tt>) and <tt>'bottom'</tt>
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78 * (or <tt>'b'</tt>).<div class="sub-desc">
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79 * Either the container must have a fixed size or an anchorSize config value defined at render time in
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80 * order for these to have any effect.</div></li>
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82 * <li><b>Mixed</b> : <div class="sub-desc">
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83 * Anchor values can also be mixed as needed. For example, to render the width offset from the container
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84 * right edge by 50 pixels and 75% of the container's height use:
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87 * </code></pre></div></li>
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97 getAnchorViewSize : function(ct, target){
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98 return target.dom == document.body ?
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99 target.getViewSize() : target.getStyleSize();
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103 onLayout : function(ct, target){
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104 Ext.layout.AnchorLayout.superclass.onLayout.call(this, ct, target);
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106 var size = this.getAnchorViewSize(ct, target);
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108 var w = size.width, h = size.height;
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110 if(w < 20 && h < 20){
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114 // find the container anchoring size
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117 if(typeof ct.anchorSize == 'number'){
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118 aw = ct.anchorSize;
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120 aw = ct.anchorSize.width;
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121 ah = ct.anchorSize.height;
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124 aw = ct.initialConfig.width;
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125 ah = ct.initialConfig.height;
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128 var cs = ct.items.items, len = cs.length, i, c, a, cw, ch;
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129 for(i = 0; i < len; i++){
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133 if(!a){ // cache all anchor values
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134 var vs = c.anchor.split(' ');
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135 c.anchorSpec = a = {
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136 right: this.parseAnchor(vs[0], c.initialConfig.width, aw),
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137 bottom: this.parseAnchor(vs[1], c.initialConfig.height, ah)
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140 cw = a.right ? this.adjustWidthAnchor(a.right(w), c) : undefined;
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141 ch = a.bottom ? this.adjustHeightAnchor(a.bottom(h), c) : undefined;
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144 c.setSize(cw || undefined, ch || undefined);
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151 parseAnchor : function(a, start, cstart){
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152 if(a && a != 'none'){
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154 if(/^(r|right|b|bottom)$/i.test(a)){ // standard anchor
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155 var diff = cstart - start;
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156 return function(v){
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162 }else if(a.indexOf('%') != -1){
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163 var ratio = parseFloat(a.replace('%', ''))*.01; // percentage
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164 return function(v){
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167 return Math.floor(v*ratio);
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171 a = parseInt(a, 10);
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172 if(!isNaN(a)){ // simple offset adjustment
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173 return function(v){
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186 adjustWidthAnchor : function(value, comp){
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191 adjustHeightAnchor : function(value, comp){
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196 * @property activeItem
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200 Ext.Container.LAYOUTS['anchor'] = Ext.layout.AnchorLayout;