鼠标的拖动操作

超、凢脫俗 2021-11-02 15:56 369阅读 0赞

unit Unit1;
    
    interface
    
    uses
      Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
      Dialogs, StdCtrls;
    
    type
      TForm1 = class(TForm)
        Edit1: TEdit;
        Memo1: TMemo;
        procedure Edit1MouseDown(Sender: TObject; Button: TMouseButton;
          Shift: TShiftState; X, Y: Integer);
        procedure Memo1DragOver(Sender, Source: TObject; X, Y: Integer;
          State: TDragState; var Accept: Boolean);
        procedure Memo1DragDrop(Sender, Source: TObject; X, Y: Integer);
      private
        { Private declarations }
      public
        { Public declarations }
      end;
    
    var
      Form1: TForm1;
    
    implementation
    
    {$R *.dfm}
    
    procedure TForm1.Edit1MouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);                      //鼠标按下事件
    begin
      if button = mbLeft then
        (sender as tedit).BeginDrag(false);                    //当单击鼠标左键并拖动一小段距离后才进行拖动操作
    end;
    
    procedure TForm1.Memo1DragDrop(Sender, Source: TObject; X, Y: Integer);
    begin                                                      //停止拖动事件
      if (sender is tmemo) and (source is tedit) then
        (sender as tmemo).Lines.Add((source as tedit).Text);   //将编辑框中的内容添加到Memo组件的最后
    end;
    
    procedure TForm1.Memo1DragOver(Sender, Source: TObject; X, Y: Integer;
      State: TDragState; var Accept: Boolean);                 //鼠标拖动事件
    begin
      if source is tedit then
        accept := true;                                        //可以接受拖动操作
    end;
    
    end.

![2011120816243430.png][]

转载于:https://www.cnblogs.com/endsnow/archive/2011/12/08/2280947.html

[2011120816243430.png]: /images/20211101/57e99b7653f1419d86f1e936d713f3a8.png