wince+C#下，重载OnPaint方法解决方法

wince+C#下，重载OnPaint方法
想弄一个位图按钮，用PictureBox做，处理单击事件很慢。
所以想到从Button类继承，发现重载OnPaint无效。
下面这段代码PC上正常的，能看到效果。 

C# code

class ImageButton:Button    {        private Image image;        public Image Image        {            get            {                return image;            }            set            {                image = value;            }        }                     protected override void OnPaint(PaintEventArgs pe)        {             Graphics g = pe.Graphics;             Rectangle rect = pe.ClipRectangle;             if (image != null)             {                 g.DrawImage(image, 0, 0, rect, GraphicsUnit.Pixel);             }             else             {                 base.OnPaint(pe);             }        }    }

[解决办法]
把 Rectangle rect = pe.ClipRectangle => Rectangle rect = this.ClientRectangle.试试
[解决办法]
从Control继承是比较可行的办法，所有的背景、文字等都自绘。
需要处理MouseDown、MouseUp等事件。
我这么做过，没发现4楼说的慢的问题，项目到目前还没有人反映说按钮单击响应慢。
个人认为楼主可以放心的按这个思路做下去。
[解决办法]
顶楼上！！
[解决办法]

探讨

奇怪的是，重载OnPaint为什么不生效呢？
而PC上的win from程序就生效。

[解决办法]
Button是没有OnPaint重载的 OnBackGroudPaint也没有 根本不支持重绘
现在流行的做法就是继承Control 如果你觉得太慢 那就想问 你用这个Button不就为了点击一下么
[解决办法]

探讨

大侠你写过从Control继承的位图按钮吗？
没出现单击事件慢的情况吗

[解决办法]
建议继承Control
[解决办法]
关注，帮顶
[解决办法]
试了一下出现个错误。
错误1部署和/或注册失败，错误为: 0x8973190e。 写入文件“%csidl_program_files%\smartdevice\system.drawing.dll”时出错。错误 0x80070070: 磁盘空间不足。
Device Connectivity Component
[解决办法]
ImageButton继承自Control，CF3.5下不慢：

C# code

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);        }    } 
 
[解决办法]
是呀，我做的时候，也是用MouseDown和MouseUp来实现Click事件的。
[解决办法]
散个分哈
[解决办法]

C# code
namespace MyPocketPc{    public partial class MyImageButton:Control    {        public MyImageButton()        {         }        private Image _image;        public Image Image        {            get { return _image; }            set { _image = value; }        }        protected override void OnPaint(PaintEventArgs e)        {            if (this._image != null)            {                e.Graphics.DrawImage(this._image, 0, 0, e.ClipRectangle, GraphicsUnit.Pixel);            }            base.OnPaint(e);        }    }}
[解决办法]
 哇  学过一点点  也可以说是一窍不通哈
[解决办法]
Mark!
[解决办法]
探讨

to sohighthesky:
我也是这样写的，连续点击（时间很短）还是慢。

另外我的是WINCE平台　。



[解决办法]
mark
[解决办法]
mark
[解决办法]
顶一下。

[解决办法]
顶一下。
[解决办法]
路过。
[解决办法]
顶顶
[解决办法]
学习一下哈
[解决办法]
探讨

ImageButton继承自Control，CF3.5下不慢：
C# codepublicpartialclass 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
            {returnthis.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.protectedoverridevoid 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.protectedoverridevoid OnMouseUp(MouseEventArgs e)
        {this.pressed=false;this.Invalidate();base.OnMouseUp(e);
        }// Override the OnPaint method to draw the background image and the text.protectedoverridevoid 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);
        }
    }
 

 

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