https://www.javatpoint.com/b-plus-tree https://time.geekbang.org/column/intro/100029501 https://www.cnblogs.com/geektcp/p/9992213.html
(1)当鼠标单击时,代码如下: procedure TForm1.TreeView1Click(Sender: TObject); var P:TPoint; begin GetCursorPos(P); //得到光标的位置 P := TreeView1.ScreenToClient(P); if (htOnStateIcon in TreeView1.GetHitTestInfoAt(P.X,P.Y)) then ToggleTreeViewCheckBoxes( TreeView1.Selected, cFlat...
Delphi's TTreeview doesn't natively support checkboxes but the underlying WC_TREEVIEW control does. You can add checkboxes to thetreeviewby overriding the CreateParams procedure of the TTreeView, specifying the TVS_CHECKBOXES style for the control. The result is that allnodesin the treeview wil...