C#|WINCE按钮重绘

//C#|WINCE按钮重绘 


public partial class ImageButton : Control
    {
        public ImageButton()
        {
        }


        Image backgroundImage;
        bool pressed = false;


        // Property for the background image to be drawn behind the button text.
        public Image BackgroundImage
        {
            get
            {
                return this.backgroundImage;
            }
            set
            {
                this.backgroundImage = value;
            }
        }


        // When the mouse button is pressed, set the "pressed" flag to true 
        // and invalidate the form to cause a repaint.  The .NET Compact Framework 
        // sets the mouse capture automatically.
        protected override void OnMouseDown(MouseEventArgs e)
        {
            this.pressed = true;
            this.Invalidate();
            base.OnMouseDown(e);
        }


        // When the mouse is released, reset the "pressed" flag 
        // and invalidate to redraw the button in the unpressed state.
        protected override void OnMouseUp(MouseEventArgs e)
        {
            this.pressed = false;
            this.Invalidate();
            base.OnMouseUp(e);
        }


        // Override the OnPaint method to draw the background image and the text.
        protected override void OnPaint(PaintEventArgs e)
        {
            e.Graphics.FillRectangle(new SolidBrush(SystemColors.ActiveCaption), e.ClipRectangle);


            if (this.backgroundImage != null)
            {
                ImageAttributes attr = new ImageAttributes();
                attr.SetColorKey(Color.Magenta, Color.Magenta);


                if (this.pressed)
                    e.Graphics.DrawImage(this.backgroundImage, this.ClientRectangle, 0, 0, this.backgroundImage.Width, this.backgroundImage.Height, GraphicsUnit.Pixel, attr);
                else
                    e.Graphics.DrawImage(this.backgroundImage, this.ClientRectangle, 0, 0, this.backgroundImage.Width, this.backgroundImage.Height, GraphicsUnit.Pixel, attr);


            }


            base.OnPaint(e);
        }
    }