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Delphi中的窗体移动
文章来源:delphi精髓网

 如果你在开发图形或多媒体应用程序,你可能正在为如何不使用窗体的标题栏而移动窗体发愁。其实只需用鼠标拖动窗体的客户区就可以了。

方法一
  
  
以下是完成上述功能最普通的方法:在窗体的private声明部分加入以下过程声明:procedure WMNCHitTest(var Msg:TWMNCHitTest);message WM_NCHITTEST;然后在implementation部分加入以下代码:
            procedure TForm1{或你定义的Form名}.WMNCHitTest(var Msg:TWMNCHitTest);
            begin
            DefaultHandler(Msg);
            if Msg.Result = HTCLIENT then
            Msg.Result:= HTCAPTION;
            end;
此方法中使当鼠标点击窗体客户区时,令Windows认为被点击的是标题栏。
           
方法二
  
    
   以下是另一个实现用鼠标移动普通窗体的方法。
            procedure TForm1.FormMouseMove(Sender: TObject; Shift: TShiftState;
            X, Y: Integer);
            begin
            if (ssLeft in Shift) then begin
            ReleaseCapture;
            SendMessage(Form1.Handle,WM_SYSCOMMAND,SC_MOVE+1,0);
            end;
            end;

  以上方法不完善之处

   当把“拖动窗口的过程中显示其内容”的选项取消时,让我们看看会发生什么。这是Windows窗口的一项设置,你可以在“开始菜单-->设置-->文件夹选项-->查看-->高级设置”中找到该属性。在Windows95中,你需要修改注册表。当此属性被设为无效,拖动窗体时窗体会变为一个正方形轮廓线。也许你使用一个不规则窗体,但它仍然会显示轮廓线。
  
   当你想要让你的窗体停靠在屏幕的边缘(如:WinAmp,当你拖动窗体进入屏幕顶部某一特定位置时,窗体便紧靠在屏幕顶部),如果你使用以上第二种方法,在鼠标按钮放开前,你将无法处理窗体位置,并无法处理停靠问题。

   下面我会用简单的方法解决两个问题:
  
   第一,无论设置为何,在拖动窗体时都不显示轮廓线;
  
   第二,移动窗体时进行位置检测,并在位置适当时停靠在某一特定位置。很多人也许已经解决了这些问题,但是也许下面的代码对你会有帮助。

方法三

  
以下代码可以直接复制到Delphi中,前提是你将Form1存为uMain.pas,Form2存为uDock.pas。用到的事件是:onMouseDown,onMouseMove,onMouseUp,OnShow(Form1)。
  
   这是一个根据鼠标的移动移动窗体的方法,包含两个窗体,uMain和uDock(Form1和Form2)。Form2通过Form1打开,并可以停靠在Form1的底部。停靠后,Form2将随Form1一起移动,直到你将Form2移开。
  Form1
            unit uMain;
            interface
            uses
            Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
            Dialogs;
            type
            TForm1 = class(TForm)
            procedure FormMouseDown(Sender:TObject;
            Button:TMouseButton;Shift:TShiftState;X,Y: Integer);
            procedure FormMouseMove(Sender: TObject; Shift: TShiftState;X,Y:
            Integer);
            procedure
            FormMouseUp(Sender:TObject;Button:TMouseButton;Shift:TShiftState;X,Y:
            Integer);
            procedure FormShow(Sender: TObject);
            private
            { Private declarations }
            public
            DocktoForm: Boolean;
            { Public declarations }
            end;
            var
            Form1: TForm1;
            CanMove, CanMoveX, CanMoveY: Boolean;
            OldX, OldY: Integer;
            F1X,F1Y,F2X,F2Y: integer;
            WorkArea : TRect;
            implementation
            uses uDock;
            {$R *.DFM}
            procedure TForm1.FormMouseDown(Sender: TObject; Button:
            TMouseButton;Shift: TShiftState; X, Y: Integer);
            begin
            CanMoveX := true;
            CanMoveY := true;
            CanMove := true;
            OldX := X;
            OldY := Y;
            if DocktoForm then

        begin
            F1X := Form1.Left;
            F1Y := Form1.Top;
            F2X := Form2.Left;
            F2Y := Form2.Top;
            end;
            end;
            procedure TForm1.FormMouseMove(Sender: TObject; Shift: TShiftState;
            X, Y: Integer);
            begin
            if (CanMove) then
            begin
            if CanMoveX then
            Form1.Left := Form1.Left + (X - OldX);
            if CanMoveY then
            Form1.Top := Form1.Top + (Y - OldY);
            //This section latches to the top
            if (Form1.Top < WorkArea.Top + 10) and (Form1.Top > WorkArea.Top-10)
            then
            begin
            Form1.Top := WorkArea.Top;
            if (Y-OldY > 10) or (Y-OldY < -10) then
            CanMoveY := true
            else
            CanMoveY := False;
            end;
            //This section latches to the left side
            if (Form1.Left < WorkArea.Left+10) and (Form1.Left >
            WoskArea.Left-10) then
            begin
            Form1.Left := WorkArea.Left;
            if (X-OldX > 10) or (X-OldX < -10) then
            CanMoveX := true
            else
            CanMoveX := False;
            end;
        //This section latches to the right side
            if (Form1.Left > WorkArea.Right-Form1.Width-10) and (Form1.Left <
            WorkArea.Right-Form1.Width+10) then
            begin
            Form1.Left := WorkArea.Right-Form1.Width;
            if (X-OldX > 10) or (X-OldX < -10) then
            CanMoveX := true
            else
            CanMoveX := False;
            end;
            //This section latches to the TaskBar
            if DocktoForm then
            begin
            if (Form1.Top > WorkArea.Bottom-Form1.Height-Form2.Height-10) and
            (Form1.Top < WorkArea.Bottom-Form1.Height-Form2.Height+10) then
            begin
            Form1.Top := WorkArea.Bottom-Form1.Height-Form2.Height;
            if (Y-OldY > 10) or (Y-OldY < -10) then
            CanMoveY := true
            else
            CanMoveY := False;
            end;
            end
            else begin
            if (Form1.Top > WorkArea.Bottom-Form1.Height-10) and (Form1.Top <
            WorkArea.Bottom-Form1.Height+10) then
            begin
            Form1.Top := WorkArea.Bottom-Form1.Height;
            if (Y-OldY > 10) or (Y-OldY < -10) then
            CanMoveY := true
            else
            CanMoveY := False;
            end;
            end;

      if DocktoForm then
            begin
            Form2.Left := Form1.Left - (F1X-F2X);// + (X-OldX);
            Form2.Top := Form1.Top+Form1.Height;
            exit;
            end;
            //This section latches playlist in center of Form1
            if (Form2.Left > Form1.Left + ((Form1.Width div 2)-(Form2.Width div
            2))-10) and (Form2.Left < Form1.Left + ((Form1.Width div
            2)-(Form2.Width div 2))+10) and
            (Form2.Top > Form1.Top+Form1.Height-10) and (Form2.Top <
            Form1.Top+Form1.Height+10) then
            begin
            Form2.Left := Form1.Left + ((Form1.Width div 2)-(Form2.Width div 2));
            DocktoForm := True;
            F1X := Form1.Left;
            F1Y := Form1.Top;
            F2X := Form2.Left;
            F2Y := Form2.Top;
            end;
            end;
            end;
            procedure TForm1.FormMouseUp(Sender: TObject; Button: TMouseButton;
            Shift: TShiftState; X, Y: Integer);
            begin
            CanMove := false;
            end;
            procedure TForm1.FormShow(Sender: TObject);
            begin
            //Get Work Area Parameters
            SystemParametersInfo(SPI_GETWORKAREA, 0, @WorkArea, 0 );
            Form2.Show;
            end;
            end.
       Form2
            unit uDock;
            interface
            uses
            Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
            Dialogs;
            type
            TForm2 = class(TForm)
            procedure FormMouseDown(Sender: TObject; Button: TMouseButton;Shift:
            TShiftState; X, Y: Integer);
            procedure FormMouseMove(Sender: TObject; Shift: TShiftState; X,Y:
            Integer);
            procedure FormMouseUp(Sender: TObject; Button: TMouseButton;Shift:
            TShiftState; X, Y: Integer);
            private
            { Private declarations }
            public
            { Public declarations }
            end;
            var
            Form2: TForm2;
            CanMove, CanMoveX, CanMoveY, DocktoForm: Boolean;
            OldX, OldY: Integer;
            implementation
            uses uMain;
            {$R *.DFM}
            procedure TForm2.FormMouseDown(Sender: TObject; Button:
            TMouseButton;Shift: TShiftState; X, Y: Integer);
            begin
            CanMoveX := true;
            CanMoveY := true;
            CanMove := true;
            OldX := X;
            OldY := Y;
            end;
            procedure TForm2.FormMouseMove(Sender: TObject; Shift: TShiftState;
            X, Y: Integer);
            begin
            if (CanMove) then
            begin
            if CanMoveX then
            Form2.Left := Form2.Left + (X - OldX);
            if CanMoveY then
            Form2.Top := Form2.Top + (Y - OldY);
            //This section latches to the top
            if (Form2.Top < WorkArea.Top + 10) and (Form2.Top > WorkArea.Top-10)
            then
     begin
            Form2.Top := WorkArea.Top;
            if (Y-OldY > 10) or (Y-OldY < -10) then
            CanMoveY := true
            else
            CanMoveY := False;
            end;
            //This section latches to the left side
            if (Form2.Left < WorkArea.Left+10) and (Form2.Left >
            WorkArea.Left-10) then
            begin
            Form2.Left := WorkArea.Left;
            if (X-OldX > 10) or (X-OldX < -10) then
            CanMoveX := true
            else
            CanMoveX := False;
            end;
            //This section latches to the right side
            if (Form2.Left > WorkArea.Right-Form2.Width-10) and (Form2.Left <
            WorkArea.Right-Form2.Width+10) then
            begin
            Form2.Left := WorkArea.Right-Form2.Width;
            if (X-OldX > 10) or (X-OldX < -10) then
            CanMoveX := true
            else
            CanMoveX := False;
            end;
            //This section latches to the TaskBar
            if (Form2.Top > WorkArea.Bottom-Form2.Height-10) and (Form2.Top <
            WorkArea.Bottom-Form2.Height+10) then
            begin
            Form2.Top := WorkArea.Bottom-Form2.Height;
            if (Y-OldY > 10) or (Y-OldY < -10) then
            CanMoveY := true
            else
            CanMoveY := False;
            exit;
            end;

      //This section latches to the Player Bottom
            if (Form2.Top > Form1.Top+Form1.Height-10) and (Form2.Top <
            Form1.Top+Form1.Height+10) and (Form2.Left > Form1.Left-Form2.Width)
            and (Form2.Left < Form1.Left + Form1.Width) then
            begin
            Form2.Top := Form1.Top+Form1.Height;
            if (Y-OldY > 10) or (Y-OldY < -10) then begin
            CanMoveY := true;
            Form1.DockToForm := False;
            end
            else begin
            CanMoveY := False;
            Form1.DockToForm := True;
            end;
            end;
            //This section latches playlist in center of Form1
            if (Form2.Left > Form1.Left + ((Form1.Width div 2)-(Form2.Width div
            2))-10) and (Form2.Left < Form1.Left + ((Form1.Width div
            2)-(Form2.Width div 2))+10) and
            (Form2.Top > Form1.Top+Form1.Height-10) and (Form2.Top <
            Form1.Top+Form1.Height+10) then
            begin
            Form2.Left := Form1.Left + ((Form1.Width div 2)-(Form2.Width div 2));
            if (X-OldX > 10) or (X-OldX < -10) or (Y-OldY > 10) or (Y-OldY <
            -10) then
            CanMoveX := true
            else
            CanMoveX := False;
            end;
            end;
            end;
            procedure TForm2.FormMouseUp(Sender: TObject; Button:
            TMouseButton;Shift: TShiftState; X, Y: Integer);
            begin
            CanMove := false;
            end;
            end.

   我希望以上内容对那些正面临类似内容困扰的人有所帮助。

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