Delphi中的窗體移動

2019-11-18 18:54:39

字體：大中小

來源：轉載

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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。其實只需用鼠標拖動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;

　　然后在implementation部分加入以下代碼：

procedure TForm1{或你定義的Form名}.WMNCHitTest(var Msg:TWMNCHitTest);
begin
DefaultHandler(Msg);
if Msg.Result = HTCLIENT then
Msg.Result:= HTCAPTION;
end;

　　此方法中使當鼠標點擊窗體客戶區時，令Windows認為被點擊的是標題欄。

方法二
　　以下是另一個實現用鼠標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“拖動窗口的過程中顯示其內容”的選項取消時，讓我們看看會發生什么。這是Windows窗口的一項設置，你可以在“開始菜單-->設置-->文件夾選項-->查看-->高級設置”中找到該屬性。在Windows95中，你需要修改注冊表。當此屬性被設為無效，拖動窗體時窗體會變為一個正方形輪廓線。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屏幕的邊緣（如：WinAmp，當你拖動窗體進入屏幕頂部某一特定位置時，窗體便緊靠在屏幕頂部），如果你使用以上第二種方法，在鼠標按鈕放開前，你將無法處理窗體位置，并無法處理停靠問題。
　　下面我會用簡單的方法解決兩個問題：
　　第一，無論設置為何，在拖動窗體時都不顯示輪廓線；
　　第二，移動窗體時進行位置檢測，并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，但是也許下面的代碼對你會有幫助。

方法三
　　以下代碼可以直接復制到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）。
　　這是一個根據鼠標的移動移動窗體的方法，包含兩個窗體，uMain和uDock（Form1和Form2）。Form2通過Form1打開，并可以停靠在Form1的底部。停靠后，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) 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;