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实现控件的移动、改变大小(DELPHI实现) (转)

原创 Linux操作系统 作者:worldblog 时间:2007-12-09 09:17:09 0 删除 编辑
实现控件的移动、改变大小(DELPHI实现) (转)[@more@]

 

实现控件的移动,改变大小(Delphi实现)

主要使用Perform方法
  function Perform(Msg: Cardinal; WParam, LParam: Longint): Longint;
 
只要能够使用类似于win32api函数SendMessage(),本方法同样可在其他环境里应用。

用Delphi实现
首先,建立一个应用程序,在一个窗体里加入一个Panel1,保存为main.pas;
然后,分别在Panel1的鼠标移动、鼠标按下事件里添加代码;
鼠标移动:控制光标的形状
procedure TForm1.Panel1MouseMove(Sender: Tobject; Shift: TShiftState; X,
  Y: Integer);
begin
  if (x>=0)and(x<=3) then
  begin
  if (y>=0)and(y<=3) then Panel1.Cursor:=crSizeNWSE;
  if (y>3)and(y  if (y>=Panel1.Height-3)and(y<=Panel1.Height) then Panel1.Cursor:=crSizeNESW;
  end
  else if (x>3)and(x  begin
  if (y>=0)and(y<=3) then Panel1.Cursor:=crSizeNS;
  if (y>3)and(y  if (y>=Panel1.Height-3)and(y<=Panel1.Width) then Panel1.Cursor:=crSizeNS;
  end
  else if (x>=Panel1.Width-3)and(x<=Panel1.Width) then
  begin
  if (y>=0)and(y<=3) then Panel1.Cursor:=crSizeNESW;
  if (y>3)and(y  if (y>=Panel1.Height-3)and(y<=Panel1.Width) then Panel1.Cursor:=crSizeNWSE;
  end;
end;

鼠标按下:控制Panel的大小或位置
procedure TForm1.Panel1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  ReleaseCapture;
  if (x>=0)and(x<=3) then
  begin
  file://左上角方向改变大小
  if (y>=0)and(y<=3) then Panel1.Perform(WM_SySCOmmand,$F004,0);
  file://左侧
  if (y>3)and(y  file://左下角
  if (y>=Panel1.Height-3)and(y<=Panel1.Height) then Panel1.Perform(WM_SysCommand,$F007,0);
  end
  else if (x>3)and(x  begin
  file://上侧
  if (y>=0)and(y<=3) then Panel1.Perform(WM_SysCommand,$F003,0);
  file://移动控件
  if (y>3)and(y  file://下侧
  if (y>=Panel1.Height-3)and(y<=Panel1.Width) then Panel1.Perform(WM_SysCommand,$F006,0);
  end
  else if (x>=Panel1.Width-3)and(x<=Panel1.Width) then
  begin
  file://右上角
  if (y>=0)and(y<=3) then Panel1.Perform(WM_SysCommand,$F005,0);
  file://右侧
  if (y>3)and(y  file://右下角
  if (y>=Panel1.Height-3)and(y<=Panel1.Width) then Panel1.Perform(WM_SysCommand,$F008,0);
  end;
end;
主要使用 PerfoRM 方法为

附录1.全部代码如下:

unit main;

interface

uses
  windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ExtCtrls;

type
  TForm1 = class(TForm)
  Panel1: TPanel;
  procedure Panel1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
  procedure Panel1MouseMove(Sender: TObject; Shift: TShiftState; X,
  Y: Integer);
  private
  { Private declarations }
  public
  { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Panel1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  ReleaseCapture;
  if (x>=0)and(x<=3) then
  begin
  if (y>=0)and(y<=3) then Panel1.Perform(WM_SysCommand,$F004,0);
  if (y>3)and(y  if (y>=Panel1.Height-3)and(y<=Panel1.Height) then Panel1.Perform(WM_SysCommand,$F007,0);
  end
  else if (x>3)and(x  begin
  if (y>=0)and(y<=3) then Panel1.Perform(WM_SysCommand,$F003,0);
  if (y>3)and(y  if (y>=Panel1.Height-3)and(y<=Panel1.Width) then Panel1.Perform(WM_SysCommand,$F006,0);
  end
  else if (x>=Panel1.Width-3)and(x<=Panel1.Width) then
  begin
  if (y>=0)and(y<=3) then Panel1.Perform(WM_SysCommand,$F005,0);
  if (y>3)and(y  if (y>=Panel1.Height-3)and(y<=Panel1.Width) then Panel1.Perform(WM_SysCommand,$F008,0);
  end;
end;

procedure TForm1.Panel1MouseMove(Sender: TObject; Shift: TShiftState; X,
  Y: Integer);
begin
  if (x>=0)and(x<=3) then
  begin
  if (y>=0)and(y<=3) then Panel1.Cursor:=crSizeNWSE;
  if (y>3)and(y  if (y>=Panel1.Height-3)and(y<=Panel1.Height) then Panel1.Cursor:=crSizeNESW;
  end
  else if (x>3)and(x  begin
  if (y>=0)and(y<=3) then Panel1.Cursor:=crSizeNS;
  if (y>3)and(y  if (y>=Panel1.Height-3)and(y<=Panel1.Width) then Panel1.Cursor:=crSizeNS;
  end
  else if (x>=Panel1.Width-3)and(x<=Panel1.Width) then
  begin
  if (y>=0)and(y<=3) then Panel1.Cursor:=crSizeNESW;
  if (y>3)and(y  if (y>=Panel1.Height-3)and(y<=Panel1.Width) then Panel1.Cursor:=crSizeNWSE;
  end;
end;

附录2.API SendMessage()介绍
SendMessage === user32.lib
LRESULT SendMessage(

  HWND hWnd, // handle of destination window
  UINT Msg, // message to send
  WPARAM wParam, // first message parameter
  LPARAM lParam  // second message parameter
  );

 

 2001.9.27


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