TreeComBobox

最新推荐文章于 2023-12-26 17:29:28 发布

xiaoxin888888

最新推荐文章于 2023-12-26 17:29:28 发布

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CC 4.0 BY-SA版权

文章标签： function dropdown constructor properties object methods

本文链接：https://blog.youkuaiyun.com/xiaoxin888888/article/details/6184859

package com.kingdee.common.components { import mx.controls.ComboBox; import mx.controls.Tree; import mx.core.ClassFactory; import mx.events.DropdownEvent; import mx.events.ListEvent; public class TreeComboBox extends ComboBox { // ------------------------------------------------------------------------- // // Properties // // ------------------------------------------------------------------------- // ---------------------------- // ddFactory // ---------------------------- private var _ddFactory:ClassFactory; private function get ddFactory():ClassFactory { if (_ddFactory == null) { _ddFactory = new ClassFactory(); _ddFactory.generator = TreeComboBoxRenderer; _ddFactory.properties = { width:this.width, height:this._treeHeight, outerDocument:this }; } return _ddFactory; } // ---------------------------- // treeHeight // ---------------------------- private var _treeHeight:Number; public function get treeHeight():Number { return _treeHeight; } public function set treeHeight(value:Number):void { this._treeHeight = value; ddFactory.properties["height"] = this._treeHeight; } // ---------------------------- // treeSelectedItem // ---------------------------- public var treeSelectedItem:Object; // ------------------------------------------------------------------------- // // Constructor // // ------------------------------------------------------------------------- public function TreeComboBox() { super(); this.dropdownFactory = ddFactory; this.addEventListener(DropdownEvent.OPEN, onComboOpen); } // ------------------------------------------------------------------------- // // Handlers // // ------------------------------------------------------------------------- private function onComboOpen(event:DropdownEvent):void { var tree:TreeComboBoxRenderer = dropdown as TreeComboBoxRenderer; if (treeSelectedItem) { tree.expandParents(treeSelectedItem); tree.selectNode(treeSelectedItem); } else { tree.expandItem(dataProvider.getItemAt(0), true); } } // ------------------------------------------------------------------------- // // Overridden methods // // ------------------------------------------------------------------------- /** * Ovverride to avoid root node label being displayed as combo text when * closing the combo box. */ override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void { super.updateDisplayList(unscaledWidth, unscaledHeight); if(dropdown && treeSelectedItem && treeSelectedItem[labelField] != null) { text = treeSelectedItem[labelField]; } } // ------------------------------------------------------------------------- // // Other functions // // ------------------------------------------------------------------------- public function updateLabel(selectedItem:Object):void { if (selectedItem) { treeSelectedItem = selectedItem; text = treeSelectedItem[labelField]; } } } } package com.kingdee.common.components { import mx.controls.Tree; import mx.events.ListEvent; public class TreeComboBoxRenderer extends Tree { // ------------------------------------------------------------------------- // // Properties // // ------------------------------------------------------------------------- [Bindable] public var outerDocument:TreeComboBox; // ------------------------------------------------------------------------- // // Constructor // // ------------------------------------------------------------------------- public function TreeComboBoxRenderer() { super(); this.addEventListener(ListEvent.CHANGE, onSelectionChanged); } // ------------------------------------------------------------------------- // // Handlers // // ------------------------------------------------------------------------- private function onSelectionChanged(event:ListEvent):void { outerDocument.updateLabel(event.currentTarget.selectedItem); } // ------------------------------------------------------------------------- // // Other methods // // ------------------------------------------------------------------------- public function expandParents(node:Object):void { if (node && !isItemOpen(node)) { expandItem(node, true); expandParents(node.parent()); } } public function selectNode(node:Object):void { selectedItem=node; var idx:int=getItemIndex(selectedItem); scrollToIndex(idx); } } }