Wince下实现ImageButton_.NET_编程开发_程序员俱乐部

我们在winform中给按钮设置个背景图片超级简单，是不？可是在wince下面就没那么简单了，下面我来介绍一种方式来实现ImageButton。

实现思路是重新写一个usercontrol就ok。具体的实现方式如下：

class="brush:csharp;gutter:true;">/IotButton是我们新控件的名字，具体的可以自己定义 
public partial class IotButton : UserControl 
    {
        public IotButton()
        {
            InitializeComponent();
        }
 
        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);
        }
    }

 这里为什么要实现一个新的UserControl而不是基于Button呢？具体原因是这样的，因为Button中没有Paint事件，没有MouseUP MouseDown MouseMove等事件因此不能很好的实现，有图有证据哦？

看看我们自定义的按钮的事件和属性吧：

总结

上面的方式实现了在wince下自定义一个可以放image的控件，具体的不同我们可以对比上面的两图得到。希望对大家有帮助哦。