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::Button1Click(TObject *Sender)
{
    delete ShapeNew;
    ShapeNew= new TShape(this);
    ShapeNew->Parent=Form1;
    ShapeNew->Left=80;
    ShapeNew->Top=30;
    //指定OnMouseDown事件处理函数
    ShapeNew->OnMouseDown=ShapeMouseDown;

}
//---------------------------------------------------------------------------
void __fastcall TForm1::ShapeMouseDown(TObject *Sender,
      TMouseButton Button, TShiftState Shift, int X, int Y)
{
     //显示Shape鼠标点击的位置，相对坐标原点是Shape组件的左上角
     ShowMessage("X="+AnsiString(X)+"; Y="+AnsiString(Y));
}
//-------------------------------------------------------------------------
void __fastcall TForm1::RadioGroup1Click(TObject *Sender)
{
    if(ShapeNew==NULL)//如果没有生成Shape组件，就返回
    {
        return;
    }
    if(RadioGroup1->ItemIndex==0)//圆形
    {
        ShapeNew->Shape=stCircle;
    }
    else//矩形
    {
        ShapeNew->Shape=stRectangle;
    }
        
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button2Click(TObject *Sender)
{
   delete ShapeNew;
   //保证指针为空，便于以后检查本组件是否存在
   //也可以通过其他方法来实现本功能
   ShapeNew=NULL;

}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormCreate(TObject *Sender)
{
   ShapeNew=NULL;        
}
//---------------------------------------------------------------------------