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source: trunk/workshop-routing-foss4g/web/ext/src/widgets/layout/ColumnLayout.js @ 77

Revision 76, 6.1 KB checked in by djay, 13 years ago (diff)

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1/*!
2 * Ext JS Library 3.4.0
3 * Copyright(c) 2006-2011 Sencha Inc.
4 * licensing@sencha.com
5 * http://www.sencha.com/license
6 */
7/**
8 * @class Ext.layout.ColumnLayout
9 * @extends Ext.layout.ContainerLayout
10 * <p>This is the layout style of choice for creating structural layouts in a multi-column format where the width of
11 * each column can be specified as a percentage or fixed width, but the height is allowed to vary based on the content.
12 * This class is intended to be extended or created via the layout:'column' {@link Ext.Container#layout} config,
13 * and should generally not need to be created directly via the new keyword.</p>
14 * <p>ColumnLayout does not have any direct config options (other than inherited ones), but it does support a
15 * specific config property of <b><tt>columnWidth</tt></b> that can be included in the config of any panel added to it.  The
16 * layout will use the columnWidth (if present) or width of each panel during layout to determine how to size each panel.
17 * If width or columnWidth is not specified for a given panel, its width will default to the panel's width (or auto).</p>
18 * <p>The width property is always evaluated as pixels, and must be a number greater than or equal to 1.
19 * The columnWidth property is always evaluated as a percentage, and must be a decimal value greater than 0 and
20 * less than 1 (e.g., .25).</p>
21 * <p>The basic rules for specifying column widths are pretty simple.  The logic makes two passes through the
22 * set of contained panels.  During the first layout pass, all panels that either have a fixed width or none
23 * specified (auto) are skipped, but their widths are subtracted from the overall container width.  During the second
24 * pass, all panels with columnWidths are assigned pixel widths in proportion to their percentages based on
25 * the total <b>remaining</b> container width.  In other words, percentage width panels are designed to fill the space
26 * left over by all the fixed-width and/or auto-width panels.  Because of this, while you can specify any number of columns
27 * with different percentages, the columnWidths must always add up to 1 (or 100%) when added together, otherwise your
28 * layout may not render as expected.  Example usage:</p>
29 * <pre><code>
30// All columns are percentages -- they must add up to 1
31var p = new Ext.Panel({
32    title: 'Column Layout - Percentage Only',
33    layout:'column',
34    items: [{
35        title: 'Column 1',
36        columnWidth: .25
37    },{
38        title: 'Column 2',
39        columnWidth: .6
40    },{
41        title: 'Column 3',
42        columnWidth: .15
43    }]
44});
45
46// Mix of width and columnWidth -- all columnWidth values must add up
47// to 1. The first column will take up exactly 120px, and the last two
48// columns will fill the remaining container width.
49var p = new Ext.Panel({
50    title: 'Column Layout - Mixed',
51    layout:'column',
52    items: [{
53        title: 'Column 1',
54        width: 120
55    },{
56        title: 'Column 2',
57        columnWidth: .8
58    },{
59        title: 'Column 3',
60        columnWidth: .2
61    }]
62});
63</code></pre>
64 */
65Ext.layout.ColumnLayout = Ext.extend(Ext.layout.ContainerLayout, {
66    // private
67    monitorResize:true,
68
69    type: 'column',
70
71    extraCls: 'x-column',
72
73    scrollOffset : 0,
74
75    // private
76
77    targetCls: 'x-column-layout-ct',
78
79    isValidParent : function(c, target){
80        return this.innerCt && c.getPositionEl().dom.parentNode == this.innerCt.dom;
81    },
82
83    getLayoutTargetSize : function() {
84        var target = this.container.getLayoutTarget(), ret;
85        if (target) {
86            ret = target.getViewSize();
87
88            // IE in strict mode will return a width of 0 on the 1st pass of getViewSize.
89            // Use getStyleSize to verify the 0 width, the adjustment pass will then work properly
90            // with getViewSize
91            if (Ext.isIE && Ext.isStrict && ret.width == 0){
92                ret =  target.getStyleSize();
93            }
94
95            ret.width -= target.getPadding('lr');
96            ret.height -= target.getPadding('tb');
97        }
98        return ret;
99    },
100
101    renderAll : function(ct, target) {
102        if(!this.innerCt){
103            // the innerCt prevents wrapping and shuffling while
104            // the container is resizing
105            this.innerCt = target.createChild({cls:'x-column-inner'});
106            this.innerCt.createChild({cls:'x-clear'});
107        }
108        Ext.layout.ColumnLayout.superclass.renderAll.call(this, ct, this.innerCt);
109    },
110
111    // private
112    onLayout : function(ct, target){
113        var cs = ct.items.items,
114            len = cs.length,
115            c,
116            i,
117            m,
118            margins = [];
119
120        this.renderAll(ct, target);
121
122        var size = this.getLayoutTargetSize();
123
124        if(size.width < 1 && size.height < 1){ // display none?
125            return;
126        }
127
128        var w = size.width - this.scrollOffset,
129            h = size.height,
130            pw = w;
131
132        this.innerCt.setWidth(w);
133
134        // some columns can be percentages while others are fixed
135        // so we need to make 2 passes
136
137        for(i = 0; i < len; i++){
138            c = cs[i];
139            m = c.getPositionEl().getMargins('lr');
140            margins[i] = m;
141            if(!c.columnWidth){
142                pw -= (c.getWidth() + m);
143            }
144        }
145
146        pw = pw < 0 ? 0 : pw;
147
148        for(i = 0; i < len; i++){
149            c = cs[i];
150            m = margins[i];
151            if(c.columnWidth){
152                c.setSize(Math.floor(c.columnWidth * pw) - m);
153            }
154        }
155
156        // Browsers differ as to when they account for scrollbars.  We need to re-measure to see if the scrollbar
157        // spaces were accounted for properly.  If not, re-layout.
158        if (Ext.isIE) {
159            if (i = target.getStyle('overflow') && i != 'hidden' && !this.adjustmentPass) {
160                var ts = this.getLayoutTargetSize();
161                if (ts.width != size.width){
162                    this.adjustmentPass = true;
163                    this.onLayout(ct, target);
164                }
165            }
166        }
167        delete this.adjustmentPass;
168    }
169
170    /**
171     * @property activeItem
172     * @hide
173     */
174});
175
176Ext.Container.LAYOUTS['column'] = Ext.layout.ColumnLayout;
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