{"id":4882,"date":"2018-04-21T15:41:19","date_gmt":"2018-04-21T07:41:19","guid":{"rendered":"http:\/\/blog.qdac.cc\/?p=4882"},"modified":"2018-04-23T11:24:20","modified_gmt":"2018-04-23T03:24:20","slug":"%e6%95%99%e7%a8%8bqdac-fmx-virtualtreeview-%e5%85%a5%e9%97%a8%e6%95%99%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/blog.qdac.cc\/?p=4882","title":{"rendered":"[\u6559\u7a0b]QDAC FMX VirtualTreeView \u5165\u95e8\u6559\u7a0b"},"content":{"rendered":"<p>\u5b9e\u9645\u4e0a\uff0c\u672c\u4e0d\u60f3\u9020\u8f66\uff0c\u53ef\u5b98\u65b9\u7684\u8f66\u592a\u7834\uff0c\u800c Jam software \uff08\u539fSoftgem\uff09\u7684 VirtualTreeView\uff08\u540e\u9762\u79f0\u8001VT\u5427\uff09 \u53c8\u4e0d\u77e5\u9053 FMX \u7248\u8981\u7b49\u5230\u4ec0\u4e48\u65f6\u5019\uff0c\u672c\u7740\u6c42\u4eba\u4e0d\u5982\u6c42\u5df1\u7684\u57fa\u672c\u539f\u5219\uff0c\u7f16\u5199\u4e86\u8fd9\u4e2a\u7ec4\u4ef6\u3002\u4e0d\u8fc7\uff0c\u611f\u8c22\u7684\u8bdd\u662f\u5fc5\u9700\u8bf4\u7684\uff0c\u8fd9\u4e2a\u7ec4\u4ef6\u7684\u6838\u5fc3\u601d\u60f3\u5b9e\u9645\u4e0a\u4e0e\u8001VT\u7684\u57fa\u672c\u4e00\u81f4\u3002\u4e0d\u8fc7\u6211\u6ca1\u6709\u7167\u6252\u522b\u4eba\u4e1c\u897f\u7684\u4e60\u60ef\uff0c\u867d\u7136\u5b83\u7684\u8bbe\u8ba1\u5df2\u7ecf\u5f88\u597d\u7528\uff0c\u4f46\u6211\u8fd8\u662f\u60f3\u6309\u7167\u81ea\u5df1\u7684\u60f3\u6cd5\u8bbe\u8ba1\u8fd9\u4e2a TQVirtualTreeView\uff08\u4e0b\u9762\u79f0\u65b0VT\u5427\uff09\u3002<\/p>\n<p>\u9996\u5148\uff0c\u8fd9\u4e2a\u7ec4\u4ef6\u5206\u6210\u4e86\u4e09\u4e2a\u7ea7\u522b\uff0c\u7136\u540e\u5b9a\u4e49\u597d\u63a5\u53e3\u5e76\u5206\u522b\u5b9e\u73b0\u5b83\uff1a<\/p>\n<ul>\n<li>\u6570\u636e\u7ba1\u7406<\/li>\n<li>\u5185\u5bb9\u5448\u73b0<\/li>\n<li>\u5185\u5bb9\u7f16\u8f91<\/li>\n<\/ul>\n<p>\u8fd9\u4e48\u5206\u5c42\u4ee5\u540e\uff0c\u63a5\u4e0b\u6765\u5c31\u662f\u5b8c\u6210\u5404\u81ea\u7684\u7ec4\u6210\u90e8\u5206\u3002<\/p>\n<h4>\u4e00\u3001\u6570\u636e\u7ba1\u7406\u8fd9\u65b9\u9762<\/h4>\n<p>\u6bcf\u4e2a\u7ed3\u70b9\u5bf9\u5e94\u7684\u662f\u4e00\u4e2a TQVTNode 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\u6362\u79cd\u8bbe\u8ba1\u601d\u8def\uff0c\u63d0\u4f9b\u4e86\u4e00\u4e2a\u6269\u5c55\u5c5e\u6027 Exts \u6765\u7ba1\u7406\u6269\u5c55\u5217\u8868\uff0c\u8ba9\u4f60\u53ef\u4ee5\u6269\u5c55\u4efb\u4f55\u57fa\u4e8e\u63a5\u53e3\u7684\u6570\u636e\u5185\u5bb9\uff0c\u800c\u4f7f\u7528\u63a5\u53e3\u7684\u539f\u56e0\u5c31\u662f\u5185\u5b58\u7684\u81ea\u52a8\u7ba1\u7406\uff0c\u6211\u4eec\u4e0d\u9700\u8981\u53bb\u5173\u5fc3\u5185\u5b58\u91ca\u653e\u7684\u95ee\u9898\u3002\u5f53\u7136\uff0c\u5982\u679c\u4f60\u6269\u5c55\u6570\u636e\u662f\u8bb0\u5f55\u6216\u8005\u666e\u901a\u5bf9\u8c61\u600e\u4e48\u529e\uff1f\u65b0 VT \u7ed9\u4f60\u63d0\u4f9b\u4e86\u4e00\u4e2a TQSimpleInterface \u6a21\u677f\u7c7b\u6765\u505a\u4e00\u4e2a\u7b80\u5355\u7684\u5c01\u88c5\u3002<\/p>\n<p>\u6211\u4eec\u56de\u5230 Exts \u8fd9\u4e2a\u5c5e\u6027\uff0c\u5b83\u5b9e\u9645\u662f TList&lt;IInterface&gt; \u7c7b\u578b\uff0c\u6240\u4ee5\u589e\u5220\u5565\u7684\u6211\u5c31\u4e0d\u8bf4\u4e86\uff0c\u65b0 VT \u63d0\u4f9b\u4e86\u989d\u5916\u7684\u65b9\u6cd5\u65b9\u4fbf\u4f60\u68c0\u7d22\u6269\u5c55\u6210\u5458\uff1a<\/p>\n<pre class=\"lang:delphi decode:true\">function ExtByType(const IID: TGuid; var AValue): Boolean; overload;\r\nfunction ExtByType(const AClass: TClass): TObject; overload;\r\nfunction ExtByType(const AClass: TClass; var AValue): Boolean; overload;\r\nfunction ExtByName(const AName: String): IInterface;\r\n<\/pre>\n<p>\u8fd9\u51e0\u4e2a\u63a5\u53e3\uff0c\u90fd\u4f1a\u8fd4\u56de\u627e\u5230\u7684\u7b2c\u4e00\u4e2a\u3002\u6ce8\u610f\u7b2c\u56db\u4e2a\u63a5\u53e3 ExtByName \u8981\u6c42\u4f60\u6dfb\u52a0\u7684\u6269\u5c55\u6570\u636e\u652f\u6301\u00a0IQVTNamedExt \u63a5\u53e3\uff0c\u4ee5\u4f46\u80fd\u591f\u8ba9\u51fd\u6570\u5f97\u5230\u6269\u5c55\u6570\u636e\u7684\u540d\u79f0\u3002\u7b2c\u4e09\u4e2a\u53ef\u4ee5\u8ba4\u4e3a\u662f\u7b2c\u4e8c\u4e2a\u7684\u91cd\u8f7d\uff0c\u7b2c\u4e00\u4e2a\u662f\u6839\u636e\u63a5\u53e3 ID \u76f4\u63a5\u53bb\u627e\u5bf9\u5e94\u7684\u63a5\u53e3\u3002\u544a\u8bc9\u4f60\u4e00\u4e2a\u5c0f\u79d8\u5bc6\uff0c\u7531\u4e8e TQVTNode \u91cd\u8f7d\u4e86 QueryInterface \u63a5\u53e3\uff0c\u6240\u4ee5\u5b9e\u9645\u4e0a\uff0c\u5982\u679c\u4f60\u61d2\u7684\u53ef\u4ee5\uff0c\u4f60\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528 Delphi \u81ea\u8eab\u7684\u4e00\u4e9b\u5bf9\u63a5\u53e3\u7684\u652f\u6301\u6765\u8bbf\u95ee\u6269\u5c55\u6570\u636e\uff0c\u6bd4\u5982\u6211\u4eec\u7684\u6269\u5c55\u6570\u636e\u6709\u4e00\u4e2a\u7c7b\u578b\u662f IPropertyData\uff1a<\/p>\n<pre class=\"lang:delphi decode:true\">procedure TForm1.vtPropsFocusChanged(Sender: TQVirtualTreeView;\r\n  ANode: TQVTNode; ACol: Integer);\r\nvar\r\n   AData:IPropertyData;\r\nbegin\r\nAData:=ANode as IPropertyData;\r\nif Assigned(AData) then\r\n   ...\r\nend\r\n<\/pre>\n<p>\u548c<\/p>\n<pre class=\"lang:delphi decode:true \">procedure TForm1.vtPropsFocusChanged(Sender: TQVirtualTreeView;\r\n  ANode: TQVTNode; ACol: Integer);\r\nvar\r\n   AData:IPropertyData;\r\nbegin\r\nif ANode.ExtByType(IPropertyData,AData) then\r\n   ...\r\nend<\/pre>\n<p>\u4e24\u79cd\u7528\u6cd5\u90fd\u662f\u53ef\u4ee5\u7684\u3002\u901a\u8fc7\u6269\u5c55\u6570\u636e\u7684\u65b9\u5f0f\uff0c\u800c\u4e0d\u662f\u50cf\u8001 VT \u7ed1\u5b9a\u6b7b\u5230 PVirtualNode \u7ed3\u6784\u4e0a\uff0c\u5e26\u6765\u7684\u4f18\u52bf\u662f\u66f4\u7075\u6d3b\u65b9\u4fbf\uff0c\u7f3a\u70b9\u662f\u9700\u8981\u989d\u5916\u5206\u914d\u66f4\u591a\u7684\u5185\u5b58\uff08\u5217\u8868\u5bf9\u8c61\u548c\u6bcf\u4e2a\u6570\u636e\u6210\u5458\uff09\u548c\u6027\u80fd\u7684\u7565\u5fae\u4e0b\u964d\uff0c\u4f46\u6211\u786e\u5b9a\u9664\u975e\u4f60\u5199\u7684\u5f88\u70c2\uff0c\u5426\u5219\u4f60\u4e0d\u4f1a\u611f\u89c9\u5230\u4e5f\u4eec\u7684\u901f\u5ea6\u533a\u522b\u3002<\/p>\n<h3>\u4e8c\u3001\u5185\u5bb9\u5448\u73b0<\/h3>\n<p>\u5185\u5bb9\u7684\u7ed8\u5236\u8fd9\u5757\u5b9e\u9645\u4e0a\u5c31\u662f\u89e3\u51b3\u600e\u4e48\u5c06\u8fd9\u4e2a\u6811\u753b\u51fa\u6765\u7684\u95ee\u9898\u3002\u8001VT\u63d0\u4f9b\u4e86\u4e00\u4e2a TVirtualDrawTree \u548c\u4e00\u4e2a TVirtualStringTree\uff0c\u65b0 VT \u5728\u8fd9\u65b9\u9762\u7684\u505a\u6cd5\u662f\u4e3a\u6bcf\u4e2a\u5355\u5143\u683c\u7684\u7ed8\u5236\u8bf7\u6c42\u4e00\u4e2a IQVTDrawer \u63a5\u53e3\uff0c\u6bcf\u4e2a\u5355\u5143\u683c\u600e\u4e48\u7ed8\u5236\u7684\u95ee\u9898\u4ea4\u7ed9 IQVTDrawer \u7684\u5b9e\u73b0\u53bb\u89e3\u51b3\u3002\u6240\u4ee5\u5728\u65b0 VT \u4e2d\uff0c\u7ed8\u5236\u8fd9\u4e2a\u6811\u7684\u6b63\u5e38\u8fc7\u7a0b\u53d8\u6210\u4e86\uff1a<\/p>\n<ol>\n<li>\u786e\u5b9a\u8981\u7ed8\u5236\u7684\u7ed3\u70b9\u5217\u8868\uff0c\u4e0d\u53ef\u89c1\u7684\u7ed3\u70b9\u5c31\u4e0d\u9700\u8981\u753b\u4e86\u561b\u3002<\/li>\n<li>\u7ed8\u5236\u63a7\u4ef6\u7684\u5927\u5916\u6846\uff1b<\/li>\n<li>\u7ed8\u5236\u6bcf\u4e2a\u7ed3\u70b9\uff0c\u5305\u62ec\u4ed6\u4eec\u7684\u8fb9\u6846<\/li>\n<li>\u7ed8\u5236\u6807\u9898<\/li>\n<\/ol>\n<p>\u597d\u5427\uff0c\u6709\u4eba\u53ef\u80fd\u8bf4\u592a\u9ebb\u70e6\u4e86\uff0c\u6211\u8fd8\u5f97\u81ea\u5df1\u5b9e\u73b0 IQVTDrawer \u53bb\u753b\u5440\uff1f\u5f53\u7136\u4e0d\u80fd\u8fd9\u6837\uff0c\u81ea\u5df1\u753b\u5f53\u7136\u662f\u8981\u6beb\u4e0d\u72b9\u8c6b\u7684\u652f\u6301\u7684\uff0c\u4f46\u5927\u90e8\u5206\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u4e0d\u80fd\u8ba9\u4f60\u81ea\u5df1\u53bb\u505a\u8fd9\u4e2a\u8d39\u52b2\u7684\u4e8b\u3002\u6240\u4ee5\u65b0 VT \u9ed8\u8ba4\u4e86\u5f88\u591a\u7c7b\u578b\u7684\u7ed8\u5236\u5668\uff0c\u4f60\u76f4\u63a5\u8bbe\u7f6e\u00a0TQVTNode \u7684 DrawerType \u5c5e\u6027\u5c31\u597d\u4e86\u3002\u5f53\u7136\u4e86\uff0c\u5982\u679c\u9ed8\u8ba4\u7684\u7ed8\u5236\u5668\u65e0\u6cd5\u6ee1\u8db3\u4f60 BT \u7684\u9700\u6c42\uff0c\u4f60\u6709\u4e24\u79cd\u65b9\u5f0f\u53ef\u4ee5\u81ea\u7ed8\uff1a<\/p>\n<ol>\n<li>\u76f4\u63a5\u81ea\u5df1\u5b9e\u73b0 IQVTDrawer \u63a5\u53e3\uff0c\u7136\u540e\u5728\u65b0 VT \u7684 OnGetCellDrawer \u4e8b\u4ef6\u4e2d\uff0c\u8fd4\u56de\u8fd9\u4e2a\u63a5\u53e3\u7684\u5b9e\u4f8b\uff1b<\/li>\n<li>\u5728\u7a97\u4f53\u4e0a\u653e\u7f6e\u4e00\u4e2a TQVTCustomDrawer \u7ec4\u4ef6\uff0c\u7136\u540e\u54cd\u5e94 OnDraw \u4e8b\u4ef6\u5b8c\u6210\u7ed8\u5236\u3002<\/li>\n<\/ol>\n<p>\u8fd9\u91cc\u7275\u6d89\u5230\u7684\u8bb8\u591a\u7ed8\u5236\u7684\u5404\u79cd\u53c2\u6570\uff0c\u6bd4\u5982\u989c\u8272\/\u6837\u5f0f\u5565\u7684\u600e\u4e48\u77e5\u9053\u5462\uff1f\u8fd9\u5c31\u9700\u8981\u901a\u8fc7\u53e6\u4e00\u4e2a\u63a5\u53e3 IQVTCellData \u6765\u83b7\u53d6\u3002\u8fd9\u4e2a\u63a5\u53e3\u662f\u540c\u6837\u6709\u4e24\u79cd\u65b9\u5f0f\u6765\u5904\u7406\uff1a<\/p>\n<ol>\n<li>\u76f4\u63a5\u81ea\u5df1\u5b9e\u73b0 IQVTCellData \u63a5\u53e3\uff0c\u7136\u540e\u5728\u65b0 VT \u7684 OnGetCellData \u4e8b\u4ef6\u4e2d\uff0c\u8fd4\u56de\u8fd9\u4e2a\u63a5\u53e3\u7684\u5b9e\u4f8b\uff1b<\/li>\n<li>\u5728\u7a97\u4f53\u4e0a\u653e\u7f6e TQVTCustomCell \u5b50\u7c7b\u7684\u7ec4\u4ef6\uff0c\u7136\u540e\u54cd\u5e94\u5bf9\u5e94\u7684\u4e8b\u4ef6\u6765\u8fd4\u56de\u9700\u8981\u7684\u6570\u636e\uff0c\u6bd4\u5982 TQVTCustomTextCell \u5c31\u8981\u6c42\u4f60\u5b9e\u73b0 OnGetText 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