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4.C#程式設計學習——窗體Paint事件處理程式

原始碼

usingSystem;

usingSystem.Drawing;

usingSystem.Windows.Forms;

 

classPaintEvent

{

   publicstaticvoid Main()

    {

       Form form =newForm();

        form.Text ="Paint Event";

        form.Paint +=newPaintEventHandler

(MyPaintHandler);

 

       Application.Run(form);

    }

   staticvoid MyPaintHandler(object objSender, PaintEventArgs pea)

    {

       Graphics grfx = pea.Graphics;

 

        grfx.Clear(Color.Chocolate);

    }

}

         當在Main中建立窗體之後，名為MyPaintHandler方法附加到這個窗體的Paint事件中。

         從PaintEventArgs類獲得一個Graphics物件，並使用它來呼叫Clear方法。

Paint事件

         相當頻繁、有時出乎意料到呼叫這個方法。可以不中斷的快速重新繪製客戶區。

多個窗體

usingSystem;

usingSystem.Drawing;

usingSystem.Windows.Forms;

 

classPaintTwoForms

{

   staticForm form1, form2;

 

   publicstaticvoid Main()

    {

        form1 =newForm();

        form2 =newForm();

 

        form1.Text ="First Form";

        form1.BackColor =Color.White;

        form1.Paint +=newPaintEventHandler(MyPaintHandler);

 

        form2.Text ="Second Form";

       form2.BackColor =Color.White;

        form2.Paint +=newPaintEventHandler(MyPaintHandler);

        form2.Show();

 

       Application.Run(form1);

    }

   staticvoid MyPaintHandler(object objSender, PaintEventArgs pea)

    {

       Form form = (Form)objSender;

       Graphics grfx = pea.Graphics;

       string str;

 

       if (form == form1)

            str ="Hello from the first form";

       else

            str ="Hello from the second form";

 

        grfx.DrawString(str, form.Font,Brushes.Black, 0, 0);

    }

}

OnPaint方 法

         通過繼承Form而不只是建立一個例項可以獲得一些好處。

原始碼

usingSystem;

usingSystem.Drawing;

usingSystem.Windows.Forms;

 

classHelloWorld :Form

{

   publicstaticvoid Main()

    {

       Application.Run(newHelloWorld());

    }

   public HelloWorld()

    {

        Text ="Hello World";

        BackColor =Color.White;

    }

   protectedoverridevoid OnPaint(PaintEventArgs pea)

    {

       Graphics grfx = pea.Graphics;

 

        grfx.DrawString("Hello, Windows Forms!", Font,Brushes.Black, 0, 0);

    }

}

 

 

 

 

 

 

 

 

 

 

 

 

 

           

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