如果你在開發圖形或多媒體應用程序，你可能正在為如何不使用窗體的標題欄而移動窗體發愁。其實只要用滑鼠拖曳窗體的客戶區就可以了。
方法一
以下是完成上述功能最普通的方法：在窗體的PRivate聲明部分加入以下過程聲明：
procedure WMNCHitTest(var Msg:TWMNCHitTest);message WM_NCHITTEST;
然後在implementation部分加入以下程式碼：
procedure TForm1{或你定義的Form名稱}.WMNCHitTest(var Msg:TWMNCHitTest);
begin
DefaultHandler(Msg);
if Msg.Result = HTCLIENT then
Msg.Result:= HTCAPTION;
end;
此方法中使當滑鼠點選窗體客戶區時，令Windows認為被點擊的是標題列。
方法二
以下是另一個實作滑鼠移動普通窗體的方法。
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;
以上方法不完善之處
當把「拖曳視窗的過程中顯示其內容」的選項取消時，讓我們看看會發生什麼。這是Windows視窗的一個設置，你可以在「開始功能表-->設定-->資料夾選項-->檢視-->進階設定」中找到該屬性。在Windows95中，你需要修改註冊表。當此屬性被設為無效，拖曳窗體時窗體會變成一個正方形輪廓線。也許你使用一個不規則窗體，但它仍然會顯示輪廓線。
當你想要讓你的窗體停靠在螢幕的邊緣（如：WinAmp，當你拖曳窗體進入螢幕頂部某一特定位置時，窗體便緊靠在螢幕頂部），如果你使用上述第二種方法，在滑鼠按鈕放開前，你將無法處理窗體位置，並無法處理停靠問題。
下面我會用簡單的方法解決兩個問題：
第一，無論設定為何，拖曳窗體時都不顯示輪廓線；
第二，移動視窗時進行位置偵測，並在位置適當時停靠在某一特定位置。
很多人也許已經解決了這些問題，但是也許下面的程式碼對你會有幫助。
方法三
以下程式碼可以直接複製到Delphi中，前提是你將Form1存為uMain.pas，Form2存為uDock.pas。用到的事件是：OnMouseDown，OnMouseMove，OnMouseUp，OnShow（Form1）。
這是一個根據滑鼠的移動移動窗體的方法，包含兩個窗體，uMain和uDock（Form1和Form2）。 Form2透過Form1打開，並可停靠在Form1的底部。停靠後，Form2將隨Form1一起移動，直到你將Form2移開。
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) 或 (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) 或 (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) 或 (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) 或 (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) 或 (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) 或 (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) 或 (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) 或 (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) 或 (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) 或 (X-OldX < -10) 或 (Y-OldY > 10) 或 (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.
我希望以上內容對那些正面臨類似內容困擾的人有幫助。