学步园

这段代码示范怎么建立picture button

using System;<br /> using System.Drawing;<br /> using System.Windows.Forms;<br /> namespace PictureButton<br /> {<br /> public class PictureButtonDemo : System.Windows.Forms.Form<br /> {<br /> int clickCount = 0;<br /> // Create a bitmap object and fill it with the specified color.<br /> // To make it look like a custom image, draw an ellipse in it.<br /> Bitmap MakeBitmap(Color color, int width, int height)<br /> {<br /> Bitmap bmp = new Bitmap(width, height);<br /> Graphics g = Graphics.FromImage(bmp);<br /> g.FillRectangle(new SolidBrush(color), 0, 0, bmp.Width, bmp.Height);<br /> g.DrawEllipse(new Pen(Color.DarkGray), 3, 3, width - 6, height - 6);<br /> g.Dispose();<br /> return bmp;<br /> }<br /> // Create a new PictureButton control and hook up its properties.<br /> public PictureButtonDemo()<br /> {<br /> InitializeComponent();<br /> // Display the OK close button.<br /> this.MinimizeBox = false;<br /> PictureButton button = new PictureButton();<br /> button.Parent = this;<br /> button.Bounds = new Rectangle(10, 30, 150, 30);<br /> button.ForeColor = Color.White;<br /> button.BackgroundImage = MakeBitmap(Color.Blue, button.Width, button.Height);<br /> button.PressedImage = MakeBitmap(Color.LightBlue, button.Width, button.Height);<br /> button.Text = "click me";<br /> button.Click +=new EventHandler(button_Click);<br /> }<br /> protected override void Dispose( bool disposing )<br /> {<br /> base.Dispose( disposing );<br /> }<br /> private void InitializeComponent()<br /> {<br /> this.Text = "Picture Button Demo";<br /> }<br /> static void Main()<br /> {<br /> Application.Run(new PictureButtonDemo());<br /> }<br /> // Since PictureButton inherits from Control, we can just use the default<br /> // Click event that Control supports.<br /> private void button_Click(object sender, EventArgs e)<br /> {<br /> this.Text = "Click Count = " + ++this.clickCount;<br /> }<br /> }<br /> // This code shows a simple way to have a<br /> // button-like control that has a background image.<br /> public class PictureButton : Control<br /> {<br /> Image backgroundImage, pressedImage;<br /> bool pressed = false;<br /> // Property for the background image to be drawn behind the button text.<br /> public Image BackgroundImage<br /> {<br /> get<br /> {<br /> return this.backgroundImage;<br /> }<br /> set<br /> {<br /> this.backgroundImage = value;<br /> }<br /> }<br /> // Property for the background image to be drawn behind the button text when<br /> // the button is pressed.<br /> public Image PressedImage<br /> {<br /> get<br /> {<br /> return this.pressedImage;<br /> }<br /> set<br /> {<br /> this.pressedImage = value;<br /> }<br /> }<br /> // When the mouse button is pressed, set the "pressed" flag to true<br /> // and invalidate the form to cause a repaint. The .NET Compact Framework<br /> // sets the mouse capture automatically.<br /> protected override void OnMouseDown(MouseEventArgs e)<br /> {<br /> this.pressed = true;<br /> this.Invalidate();<br /> base.OnMouseDown (e);<br /> }<br /> // When the mouse is released, reset the "pressed" flag<br /> // and invalidate to redraw the button in the unpressed state.<br /> protected override void OnMouseUp(MouseEventArgs e)<br /> {<br /> this.pressed = false;<br /> this.Invalidate();<br /> base.OnMouseUp (e);<br /> }<br /> // Override the OnPaint method to draw the background image and the text.<br /> protected override void OnPaint(PaintEventArgs e)<br /> {<br /> if(this.pressed && this.pressedImage != null)<br /> e.Graphics.DrawImage(this.pressedImage, 0, 0);<br /> else<br /> e.Graphics.DrawImage(this.backgroundImage, 0, 0);<br /> // Draw the text if there is any.<br /> if(this.Text.Length > 0)<br /> {<br /> SizeF size = e.Graphics.MeasureString(this.Text, this.Font);<br /> // Center the text inside the client area of the PictureButton.<br /> e.Graphics.DrawString(this.Text,<br /> this.Font,<br /> new SolidBrush(this.ForeColor),<br /> (this.ClientSize.Width - size.Width) / 2,<br /> (this.ClientSize.Height - size.Height) / 2);<br /> }<br /> // Draw a border around the outside of the<br /> // control to look like Pocket PC buttons.<br /> e.Graphics.DrawRectangle(new Pen(Color.Black), 0, 0,<br /> this.ClientSize.Width - 1, this.ClientSize.Height - 1);<br /> base.OnPaint(e);<br /> }<br /> }<br /> }<br />