给DBGrid添加鼠标滚动事件

最新推荐文章于 2017-08-27 21:39:00 发布

转载最新推荐文章于 2017-08-27 21:39:00 发布 · 600 阅读

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本文介绍了一个使用Delphi实现的DBGrid控件鼠标滚轮滚动功能的方法。通过重写窗口过程来捕获并处理鼠标滚轮消息，实现当DBGrid获得焦点时，向上滚动页面上移，向下滚动页面下移的功能。

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interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, DB, ADODB, Grids, DBGrids;

type
   TForm1 = class(TForm)
    DBGrid1: TDBGrid;
    ADOTable1: TADOTable;
    DataSource1: TDataSource;
    procedure FormCreate(Sender: TObject);
  private
   Procedure OnMouseWheel(Var Msg :TMsg;var Handled:Boolean);
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
//------------------------------------------------------------------------------
Procedure TForm1.OnMouseWheel(Var Msg :TMsg;var Handled:Boolean);
begin
  if Msg.message = WM_MouseWheel then
  begin
    if Msg.wParam > 0 then
     begin
       if DBGrid1.Focused then
         SendMessage(DBGrid1.Handle,WM_VSCROLL,SB_PAGEUP,0);
     end
    else
     begin
       if DBGrid1.Focused then
         SendMessage(DBGrid1.Handle,WM_VSCROLL,SB_PAGEDOWN,0);
     end;
    Handled:= True;
  end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
Application.OnMessage:=OnMouseWheel; // 截获鼠标滚动事件
end;

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