unit1.cpp

C++Builder高级应用开发指南随书源码

//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::WndProc(TMessage &Message)
{
   if(Message.Msg==WM_GETMINMAXINFO)
   {
     LPMINMAXINFO lpmmi=(LPMINMAXINFO)Message.LParam;
     //当用户点击窗体状态栏上的最大化按钮时，限制窗体最大化后的长宽
     lpmmi->ptMaxSize.x=300;
     lpmmi->ptMaxSize.y=200;
     //设定窗体最大化时左上角的屏幕坐标为当前窗体的位置
     lpmmi->ptMaxPosition.x=Left;
     lpmmi->ptMaxPosition.y=Top;
     //当用户用鼠标拖动的方式改变窗体尺寸的时候，限制其最大值
     lpmmi->ptMaxTrackSize.x=300;
     lpmmi->ptMaxTrackSize.y=200;
     //当用户用鼠标拖动的方式改变窗体尺寸的时候，限制其最小值
     lpmmi->ptMinTrackSize.x=200;
     lpmmi->ptMinTrackSize.y=100;
     //显示当前窗体的长宽
     Label1->Caption="Width="+AnsiString(Width)+
                  " Height="+AnsiString(Height);
   }
   TForm::WndProc(Message);
}
//---------------------------------------------------------------------------