/**
+ * @class Ext.layout.container.CheckboxGroup
+ * @extends Ext.layout.container.Container
+ * <p>This layout implements the column arrangement for {@link Ext.form.CheckboxGroup} and {@link Ext.form.RadioGroup}.
+ * It groups the component's sub-items into columns based on the component's
+ * {@link Ext.form.CheckboxGroup#columns columns} and {@link Ext.form.CheckboxGroup#vertical} config properties.</p>
+ *
+ */
+Ext.define('Ext.layout.container.CheckboxGroup', {
+ extend: 'Ext.layout.container.Container',
+ alias: ['layout.checkboxgroup'],
+
+
+ onLayout: function() {
+ var numCols = this.getColCount(),
+ shadowCt = this.getShadowCt(),
+ owner = this.owner,
+ items = owner.items,
+ shadowItems = shadowCt.items,
+ numItems = items.length,
+ colIndex = 0,
+ i, numRows;
+
+ // Distribute the items into the appropriate column containers. We add directly to the
+ // containers' items collection rather than calling container.add(), because we need the
+ // checkboxes to maintain their original ownerCt. The distribution is done on each layout
+ // in case items have been added, removed, or reordered.
+
+ shadowItems.each(function(col) {
+ col.items.clear();
+ });
+
+ // If columns="auto", then the number of required columns may change as checkboxes are added/removed
+ // from the CheckboxGroup; adjust to match.
+ while (shadowItems.length > numCols) {
+ shadowCt.remove(shadowItems.last());
+ }
+ while (shadowItems.length < numCols) {
+ shadowCt.add({
+ xtype: 'container',
+ cls: owner.groupCls,
+ flex: 1
+ });
+ }
+
+ if (owner.vertical) {
+ numRows = Math.ceil(numItems / numCols);
+ for (i = 0; i < numItems; i++) {
+ if (i > 0 && i % numRows === 0) {
+ colIndex++;
+ }
+ shadowItems.getAt(colIndex).items.add(items.getAt(i));
+ }
+ } else {
+ for (i = 0; i < numItems; i++) {
+ colIndex = i % numCols;
+ shadowItems.getAt(colIndex).items.add(items.getAt(i));
+ }
+ }
+
+ if (!shadowCt.rendered) {
+ shadowCt.render(this.getRenderTarget());
+ } else {
+ // Ensure all items are rendered in the correct place in the correct column - this won't
+ // get done by the column containers themselves if their dimensions are not changing.
+ shadowItems.each(function(col) {
+ var layout = col.getLayout();
+ layout.renderItems(layout.getLayoutItems(), layout.getRenderTarget());
+ });
+ }
+
+ shadowCt.doComponentLayout();
+ },
+
+
+ // We don't want to render any items to the owner directly, that gets handled by each column's own layout
+ renderItems: Ext.emptyFn,
+
+
+ /**
+ * @private
+ * Creates and returns the shadow hbox container that will be used to arrange the owner's items
+ * into columns.
+ */
+ getShadowCt: function() {
+ var me = this,
+ shadowCt = me.shadowCt,
+ owner, items, item, columns, columnsIsArray, numCols, i;
+
+ if (!shadowCt) {
+ // Create the column containers based on the owner's 'columns' config
+ owner = me.owner;
+ columns = owner.columns;
+ columnsIsArray = Ext.isArray(columns);
+ numCols = me.getColCount();
+ items = [];
+ for(i = 0; i < numCols; i++) {
+ item = {
+ xtype: 'container',
+ cls: owner.groupCls
+ };
+ if (columnsIsArray) {
+ // Array can contain mixture of whole numbers, used as fixed pixel widths, and fractional
+ // numbers, used as relative flex values.
+ if (columns[i] < 1) {
+ item.flex = columns[i];
+ } else {
+ item.width = columns[i];
+ }
+ }
+ else {
+ // All columns the same width
+ item.flex = 1;
+ }
+ items.push(item);
+ }
+
+ // Create the shadow container; delay rendering until after items are added to the columns
+ shadowCt = me.shadowCt = Ext.createWidget('container', {
+ layout: 'hbox',
+ items: items,
+ ownerCt: owner
+ });
+ }
+
+ return shadowCt;
+ },
+
+
+ /**
+ * @private Get the number of columns in the checkbox group
+ */
+ getColCount: function() {
+ var owner = this.owner,
+ colsCfg = owner.columns;
+ return Ext.isArray(colsCfg) ? colsCfg.length : (Ext.isNumber(colsCfg) ? colsCfg : owner.items.length);
+ }
+
+});
+