c++ builder 学习（2） 定时器的使用

1 控件System 中的TTimer

打开定时器： Timer1->Enabled = true;

关闭定时器：       Timer1 ->Enabled = false;

TTimer的InterVal属性设置定时器的时间

eg：实现字幕滚动

void __fastcall TForm2::FormPaint(TObject *Sender){  Label1->Canvas->TextOut(i, j, "Hello from the canvas");  /*TRect rect;  rect.Left = 100;  rect.right = 20;  rect.Bottom = 500;  rect.top  = 30;  DrawText(Form2->Canvas->Handle,"hello world",12,&rect,1); */}

void __fastcall TForm2::Label1MouseEnter(TObject *Sender){ //Form2-> Canvas->TextOutA(0,0,"hello world"); Timer1 ->Enabled = false;}//---------------------------------------------------------------------------void __fastcall TForm2::Label1MouseLeave(TObject *Sender){//Form2-> Canvas->TextOutA(0,0,"");   //MessageBox(Application->Handle,"bb","aa",MB_OK);//Invalidate();Timer1->Enabled = true;}//---------------------------------------------------------------------------void __fastcall TForm2::Timer1Timer(TObject *Sender){   i=i+10;   //if(i>50)   //i = 0;   Invalidate();   //SetBkMode(Canvas->Handle,TRANSPARENT);}