/**
+ * @class Ext.layout.container.Column
+ * @extends Ext.layout.container.Auto
+ * <p>This is the layout style of choice for creating structural layouts in a multi-column format where the width of
+ * each column can be specified as a percentage or fixed width, but the height is allowed to vary based on the content.
+ * This class is intended to be extended or created via the layout:'column' {@link Ext.container.Container#layout} config,
+ * and should generally not need to be created directly via the new keyword.</p>
+ * <p>ColumnLayout does not have any direct config options (other than inherited ones), but it does support a
+ * specific config property of <b><tt>columnWidth</tt></b> that can be included in the config of any panel added to it. The
+ * layout will use the columnWidth (if present) or width of each panel during layout to determine how to size each panel.
+ * If width or columnWidth is not specified for a given panel, its width will default to the panel's width (or auto).</p>
+ * <p>The width property is always evaluated as pixels, and must be a number greater than or equal to 1.
+ * The columnWidth property is always evaluated as a percentage, and must be a decimal value greater than 0 and
+ * less than 1 (e.g., .25).</p>
+ * <p>The basic rules for specifying column widths are pretty simple. The logic makes two passes through the
+ * set of contained panels. During the first layout pass, all panels that either have a fixed width or none
+ * specified (auto) are skipped, but their widths are subtracted from the overall container width. During the second
+ * pass, all panels with columnWidths are assigned pixel widths in proportion to their percentages based on
+ * the total <b>remaining</b> container width. In other words, percentage width panels are designed to fill the space
+ * left over by all the fixed-width and/or auto-width panels. Because of this, while you can specify any number of columns
+ * with different percentages, the columnWidths must always add up to 1 (or 100%) when added together, otherwise your
+ * layout may not render as expected.
+ * {@img Ext.layout.container.Column/Ext.layout.container.Column1.png Ext.layout.container.Column container layout}
+ * Example usage:</p>
+ * <pre><code>
+ // All columns are percentages -- they must add up to 1
+ Ext.create('Ext.panel.Panel', {
+ title: 'Column Layout - Percentage Only',
+ width: 350,
+ height: 250,
+ layout:'column',
+ items: [{
+ title: 'Column 1',
+ columnWidth: .25
+ },{
+ title: 'Column 2',
+ columnWidth: .55
+ },{
+ title: 'Column 3',
+ columnWidth: .20
+ }],
+ renderTo: Ext.getBody()
+ });
+
+// {@img Ext.layout.container.Column/Ext.layout.container.Column2.png Ext.layout.container.Column container layout}
+// Mix of width and columnWidth -- all columnWidth values must add up
+// to 1. The first column will take up exactly 120px, and the last two
+// columns will fill the remaining container width.
+
+ Ext.create('Ext.Panel', {
+ title: 'Column Layout - Mixed',
+ width: 350,
+ height: 250,
+ layout:'column',
+ items: [{
+ title: 'Column 1',
+ width: 120
+ },{
+ title: 'Column 2',
+ columnWidth: .7
+ },{
+ title: 'Column 3',
+ columnWidth: .3
+ }],
+ renderTo: Ext.getBody()
+ });
+</code></pre>
+ */
+Ext.define('Ext.layout.container.Column', {
+
+ extend: 'Ext.layout.container.Auto',
+ alias: ['layout.column'],
+ alternateClassName: 'Ext.layout.ColumnLayout',
+
+ type: 'column',
+
+ itemCls: Ext.baseCSSPrefix + 'column',
+
+ targetCls: Ext.baseCSSPrefix + 'column-layout-ct',
+
+ scrollOffset: 0,
+
+ bindToOwnerCtComponent: false,
+
+ getRenderTarget : function() {
+ if (!this.innerCt) {
+
+ // the innerCt prevents wrapping and shuffling while
+ // the container is resizing
+ this.innerCt = this.getTarget().createChild({
+ cls: Ext.baseCSSPrefix + 'column-inner'
+ });
+
+ // Column layout uses natural HTML flow to arrange the child items.
+ // To ensure that all browsers (I'm looking at you IE!) add the bottom margin of the last child to the
+ // containing element height, we create a zero-sized element with style clear:both to force a "new line"
+ this.clearEl = this.innerCt.createChild({
+ cls: Ext.baseCSSPrefix + 'clear',
+ role: 'presentation'
+ });
+ }
+ return this.innerCt;
+ },
+
+ // private
+ onLayout : function() {
+ var me = this,
+ target = me.getTarget(),
+ items = me.getLayoutItems(),
+ len = items.length,
+ item,
+ i,
+ parallelMargins = [],
+ itemParallelMargins,
+ size,
+ availableWidth,
+ columnWidth;
+
+ size = me.getLayoutTargetSize();
+ if (size.width < len * 10) { // Don't lay out in impossibly small target (probably display:none, or initial, unsized Container)
+ return;
+ }
+
+ // On the first pass, for all except IE6-7, we lay out the items with no scrollbars visible using style overflow: hidden.
+ // If, after the layout, it is detected that there is vertical overflow,
+ // we will recurse back through here. Do not adjust overflow style at that time.
+ if (me.adjustmentPass) {
+ if (Ext.isIE6 || Ext.isIE7 || Ext.isIEQuirks) {
+ size.width = me.adjustedWidth;
+ }
+ } else {
+ i = target.getStyle('overflow');
+ if (i && i != 'hidden') {
+ me.autoScroll = true;
+ if (!(Ext.isIE6 || Ext.isIE7 || Ext.isIEQuirks)) {
+ target.setStyle('overflow', 'hidden');
+ size = me.getLayoutTargetSize();
+ }
+ }
+ }
+
+ availableWidth = size.width - me.scrollOffset;
+ me.innerCt.setWidth(availableWidth);
+
+ // some columns can be percentages while others are fixed
+ // so we need to make 2 passes
+ for (i = 0; i < len; i++) {
+ item = items[i];
+ itemParallelMargins = parallelMargins[i] = item.getEl().getMargin('lr');
+ if (!item.columnWidth) {
+ availableWidth -= (item.getWidth() + itemParallelMargins);
+ }
+ }
+
+ availableWidth = availableWidth < 0 ? 0 : availableWidth;
+ for (i = 0; i < len; i++) {
+ item = items[i];
+ if (item.columnWidth) {
+ columnWidth = Math.floor(item.columnWidth * availableWidth) - parallelMargins[i];
+ if (item.getWidth() != columnWidth) {
+ me.setItemSize(item, columnWidth, item.height);
+ }
+ }
+ }
+
+ // After the first pass on an autoScroll layout, restore the overflow settings if it had been changed (only changed for non-IE6)
+ if (!me.adjustmentPass && me.autoScroll) {
+
+ // If there's a vertical overflow, relay with scrollbars
+ target.setStyle('overflow', 'auto');
+ me.adjustmentPass = (target.dom.scrollHeight > size.height);
+ if (Ext.isIE6 || Ext.isIE7 || Ext.isIEQuirks) {
+ me.adjustedWidth = size.width - Ext.getScrollBarWidth();
+ } else {
+ target.setStyle('overflow', 'auto');
+ }
+
+ // If the layout caused height overflow, recurse back and recalculate (with overflow setting restored on non-IE6)
+ if (me.adjustmentPass) {
+ me.onLayout();
+ }
+ }
+ delete me.adjustmentPass;
+ }
+});