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  • 学习 Message(13): 解析 TWMMouse.Keys 参数

    本例效果图:



    代码文件:
    unit Unit1;
    
    interface
    
    uses
      Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
      Dialogs;
    
    type
      TForm1 = class(TForm)
      protected
        procedure MyMouseDown(Msg: TWMMouse);
        procedure WMLButtonDown(var Message: TWMLButtonDown); message WM_LBUTTONDOWN;
        procedure WMMButtonDown(var Message: TWMMButtonDown); message WM_MBUTTONDOWN;
        procedure WMRButtonDown(var Message: TWMRButtonDown); message WM_RBUTTONDOWN;
      end;
    
    var
      Form1: TForm1;
    
    implementation
    
    {$R *.dfm}
    
    procedure TForm1.MyMouseDown(Msg: TWMMouse);
    var
      List: TStringList;
    begin
      List := TStringList.Create;
      if Msg.Keys and MK_SHIFT   <> 0 then List.Add('Shift');
      if Msg.Keys and MK_CONTROL <> 0 then List.Add('Ctrl');
      if GetKeyState(VK_MENU)    < 0  then List.Add('Alt');
      if Msg.Keys and MK_LBUTTON <> 0 then List.Add('Left');
      if Msg.Keys and MK_MBUTTON <> 0 then List.Add('Middle');
      if Msg.Keys and MK_RBUTTON <> 0 then List.Add('Right');
      Canvas.TextOut(Msg.XPos, Msg.YPos, List.CommaText);
      List.Free;
    end;
    
    procedure TForm1.WMLButtonDown(var Message: TWMLButtonDown);
    begin
      MyMouseDown(Message);
    end;
    
    procedure TForm1.WMMButtonDown(var Message: TWMMButtonDown);
    begin
      MyMouseDown(Message);
    end;
    
    procedure TForm1.WMRButtonDown(var Message: TWMRButtonDown);
    begin
      MyMouseDown(Message);
    end;
    
    end.
    
    窗体文件:
    object Form1: TForm1
      Left = 0
      Top = 0
      Caption = 'Form1'
      ClientHeight = 206
      ClientWidth = 339
      Color = clBtnFace
      Font.Charset = DEFAULT_CHARSET
      Font.Color = clWindowText
      Font.Height = -11
      Font.Name = 'Tahoma'
      Font.Style = []
      OldCreateOrder = False
      PixelsPerInch = 96
      TextHeight = 13
    end
    
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  • 原文地址:https://www.cnblogs.com/del/p/1322908.html
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