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<td width="582"><!-- #BeginEditable "%CE%C4%B1%BE%C7%F8" --><center><font color="#0000c0"><font color="#FF3333">制作可移动的窗体的MovePanel控件</font><br>
</font>福州大学<br>
王骏
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<p><font color="#ffffff">----</font> 使用Winamp是有个EasyMove的功能,也就是不在标题栏上拖动鼠标就能移动窗体,虽然EasyMove功能很好实现,可还不如做个控件一劳永逸,另外这个控件还有一个更有用的功能,呆会儿就能见到。我们先看看如何实现它吧!
<p><font color="#ffffff">----</font> 建立一个空的Unit,把以下代码Copy进去,再把它添加到Delphi的控件库里,这样MovePanel控件就做好了。
<pre>
unit MovePanel;
interface
uses
Windows, Classes, Controls,ExtCtrls;
type
TMovePanel = class(TPanel) //这个控件是继承Tpanel类的
private
PrePoint:TPoint;
Down:Boolean;
{ Private declarations }
protected
{ Protected declarations }
public
constructor Create(AOwner:TComponent);
override;
//重载鼠标事件,抢先处理消息
procedure MouseDown(Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);override;
procedure MouseUp(Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);override;
procedure MouseMove(Shift: TShiftState;
X, Y: Integer);override;
{ Public declarations }
published
{ Published declarations }
end;
procedure Register;
implementation
constructor TMovePanel.Create(AOwner:TComponent);
begin
inherited Create(AOwner); //继承父类的Create方法
end;
procedure TMovePanel.MouseDown(Button:
TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
if (Button=MBLeft) then
begin
Down:=true;
GetCursorPos(PrePoint);
end;
//如果方法已存在,就触发相应事件去调用它,
若不加此语句会造成访存异常
if assigned(OnMouseDown) then
OnMouseDown(self,Button,shift,x,y);
end;
procedure TMovePanel.MouseUp(Button:
TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
if (Button=MBLeft) and Down then
Down:=False;
if assigned(OnMouseUp) then
OnMouseUp(Self,Button,shift,X,y);
end;
procedure TMovePanel.MouseMove(Shift:
TShiftState; X, Y: Integer);
Var
NowPoint:TPoint;
begin
if down then
begin
GetCursorPos(nowPoint);
//self.Parent在Form中就是MovePanel所在的窗体,
或是MovePanel所在的容器像Panel
self.Parent.Left:=self.Parent.left
+NowPoint.x-PrePoint.x;
self.parent.Top:=self.Parent.Top
+NowPoint.y-PrePoint.y;
PrePoint:=NowPoint;
end;
if Assigned(OnMouseMove) then
OnMouseMove(self,Shift,X,y);
end;
procedure Register;
begin
RegisterComponents('Md3', [TMovePanel]);
end;
end.
</pre>
<font color="#ffffff">----</font> 接下来,看看怎么用它吧。
<p><font color="#ffffff">----</font> <b>用法一:</b>拖一个Form下来,加上我们的MovePanel,Align属性设为alClient,运行一下,移动窗体的效果还不错吧!想取消此功能,把MovePanel的Enabled属性设为False即可,简单吧!
<p><font color="#ffffff">----</font> <b>用法二:</b>拖一个Form下来,加上普通的Panel,调整好大小,再在Panel上加上我们的MovePanel,
Align属性设为alClient,运行一下,这一次在我们拖动MovePanel时不是窗体在移动,而是Panel和MovePanel一起在窗体上移动,如果我们再把其他的控件放在MovePanel上,就成了可以在窗体上任意移动的控件了,就这么简单!
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