【澳门1495娱乐】肌肤包涵专断认同控件

好久没来乐乎,今日捣鼓到近来就是为了把前边的皮层控件完善好,

那篇小说首要介绍了WinForm中DefWndProc、WndProc与IMessageFilter的界别,较为详细的分析了WinForm的消息处理机制,须求的对象可以参照下

事先也看了不少技巧文章,大部分都以友好重写系统控件完毕换肤,大约平素不像东日的(IrisSkin)控件一样
添加贰个零件
把系统的皮层全换掉,小编已经也是重写系统的控件,但自个儿就喜欢瞎捣鼓,于是就初始找那地点的资料,苦于没学过底层,对windows窗口
以及音讯循环机制不精通,找材质也几乎白搭了深切,但最终认为自身能体悟的最笨的不二法门已毕了一而再了协调写的父窗口,那么窗口添加的控件就是友好画的 而不是系统画的,

 

先上传一张效果图:

 

澳门1495娱乐 1

貌似的话,Winform的音信处理体制多数时候是透过事件处理程序开展的,但当没有对应的风浪时一般的做法是声称DefWndProc可能WndProc恐怕IMessageFilter,平日在网上看见有成文将三者并列,那么它们有如何分别呢?本文对此做一大约解析如下:

 

DefWndProc和WndProc都以继承自Control类中的虚方法,其原型如下:

澳门1495娱乐, 

?

终日效果应该也还算勉强吧,近来本身也就写了这多少个控件的鼓吹,即便这破代码捣鼓好几天了,但代码依然混乱不堪,加上反编译了微软的部分东西,因为想赶紧出来,代码都没看,直接复制过来修改成编译不报错就完事了,

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protected override void DefWndProc(ref Message m)
{
 ....
   base.DefWndProc(m);
}
   
protected override void WndProc(ref Message m);
{
 .....
   base.WndProc(m);
}

 

富有的有用户界面的控件都无冕自Control,这种艺术亟待创制对应控件的派生类,不或然合并对各种窗口的音信进行拦阻处理,因为从根本上说那二者都是Windows的窗口进程,只有接到针对本窗口自个儿的新闻。

到现在自我来说说本身完毕的思绪:

经过复习Windows的音信处理机制,对那三者的关系得以有更好的明白。应用程序的信息来自于系统音讯队列,被应用程序的主程序中的新闻循环所处理。那么些消息循环从应用程序的音信队列中取出新闻,进行预处理,然后派发到新闻对应的窗口进程,窗口进度在被调用后基于音讯的花色进行相应的拍卖,有些可以由Windows暗许处理的音讯就调用Windows的DefWindowProc。

前题条件继续的是友好写的FormBase
然后重写了系统的OnControlAdded 方法,在这边为各种控件添加美化的类,

那里的WndProc就是对应控件窗口的窗口进程,而DefWndProc会被WndProc调用,处理那一个WndProc中未处理的音信(包罗WndProc未吞掉的),由此DefWndProc收到的新闻会比WndProc少。

可怎么添加了?
找了久久,找到了三个可阻拦Control新闻的接口:IWindowTarget
接口(具体请参考
MSDN.aspx) 微软不指出直接运用的三个类)

IMessageFilter的调用暴发在应用程序的消息循环中,是音信预处理的一有些,所以它接受的新闻是更全的(除了直接发送到窗口进程不进来消息队列的这几个新闻)。行使办法如下:

Control 公开并同意修改这一个接口的新闻,

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IWindowTarget
接口有八个法子,1个是更换控件句柄的(可能应该叫设置控件句柄)
还有1个就是拍卖 Windows 音信的OnMessage
 作者要做的就是阻挠Windows 新闻的重画新闻,拦截下来
然后本身画,其它的如故丢个控件处理,(后来意识一般已毕IMessageFilter接口也可以兑现)

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public class MessageFilter : IMessageFilter
{
 public bool PreFilterMessage(ref Message msg)
 {
   //识别消息并处理
  //return true;//吞掉消息,不派发
   return false;//进入下一步派发到对应窗口过程
 }
}
   
//在应用程序消息循环中加入消息过滤器
MessageFilter f = new MessageFilter(this.lbMsg);
Application.AddMessageFilter(f);

好了屁话不多说了 上代码 上demo 没写完  希望大神能支援完善下就最好了-.-!

三者都有多少个协同的参数类型Message,它包裹了Windows音信。同时还包含3个很有益的ToString方法,可以将Message对象转换成包蕴音讯名称(WM_XXX)在内的字符串,通过Reflector可以见到已毕是因而二个里头类MessageDecoder,使用三个不长的switch语句将消息ID转换到音讯名称。

对了
就是问个2B题材,怎么拦截全体的Form创立或然Form创立句柄时?作者用IMessageFilter好像拦截不到,

Message的定义如下:

唉 代码有点乱,各位将就着看吗

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部分代码:

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[StructLayout(LayoutKind.Sequential), SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.UnmanagedCode)]
public struct Message
{
   private IntPtr hWnd;
   private int msg;
   private IntPtr wparam;
   private IntPtr lparam;
   private IntPtr result;
   public IntPtr HWnd { get; set; }
   public int Msg { get; set; }
   public IntPtr WParam { get; set; }
   public IntPtr LParam { get; set; }
   public IntPtr Result { get; set; }
   public object GetLParam(Type cls);
   public static Message Create(IntPtr hWnd, int msg, IntPtr wparam, IntPtr lparam);
   public override bool Equals(object o);
   public static bool operator !=(Message a, Message b);
   public static bool operator ==(Message a, Message b);
   public override int GetHashCode();
   public override string ToString();
}
  

澳门1495娱乐 2澳门1495娱乐 3

里头hWnd是音信对应的窗口句柄,依照下边的分析可以精晓在窗口进度(DefWndProc,WndProc)中吸收的窗口句柄都以该窗口的句柄,而在PreFilterMessage中接到的消息的窗口句柄则基于触发新闻的窗口不同而差距。

using DotNet.Windows.Forms.Internal;
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace DotNet.Windows.Forms
{
    public abstract class WindowTarget<T> : IWindowTarget
        where T : Control
    {
        private static readonly ControlStyles UserControlStyles;
        private static readonly MethodInfo SetStyleMethod;
        private static readonly MethodInfo SetStateMethod;
        private static readonly PropertyInfo CacheTextInternalProperty;
        private static readonly FieldInfo windowField;

        static WindowTarget()
        {
            UserControlStyles = ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer | ControlStyles.ResizeRedraw | ControlStyles.Selectable | ControlStyles.ContainerControl | ControlStyles.UserPaint;
            SetStyleMethod = typeof(Control).GetMethod("SetStyle",BindingFlags.Instance |BindingFlags.NonPublic);
            SetStateMethod = typeof(Control).GetMethod("SetState", BindingFlags.Instance | BindingFlags.NonPublic);
            windowField = typeof(Control).GetField("window", BindingFlags.Instance | BindingFlags.NonPublic);
            CacheTextInternalProperty = typeof(Control).GetProperty("CacheTextInternal", BindingFlags.Instance | BindingFlags.NonPublic);
        }
        private T m_Control;
        private IWindowTarget m_WindowTarget;
        private MouseState m_MouseState = MouseState.Normal;
        protected WindowTarget(T control)
        {
            m_Control = control;
            m_WindowTarget = m_Control.WindowTarget;
            m_Control.MouseUp += (o, e) => { this.MouseState = MouseState.Up; };
            m_Control.MouseEnter += (o, e) => { this.MouseState = MouseState.Move; };
            m_Control.MouseLeave += (o, e) => { this.MouseState = MouseState.Leave; };
            m_Control.MouseDown += (o, e) => { this.MouseState = MouseState.Down; };
        }
        protected virtual void SetStyle(ControlStyles styles, bool value)
        {
            SetStyleMethod.Invoke(Control, new object[] { styles, value });
        }
        private object window
        {
            get
            {
                return windowField.GetValue(Control);
            }
        }
        private bool CacheTextInternal
        {
            get
            {
                return (bool)CacheTextInternalProperty.GetValue(Control, null);
            }
            set
            {
                CacheTextInternalProperty.SetValue(Control, value, null);
            }
        }
        protected virtual void SetState(int flag, bool value)
        {
            SetStyleMethod.Invoke(Control, new object[] { flag, value });
        }
        protected T Control { get { return m_Control; } }
        protected IWindowTarget Target { get { return m_WindowTarget; } }
        protected abstract void OnPaint(DotNet.Windows.Forms.Internal.PaintEventArgs e);
        protected MouseState MouseState
        {
            get
            {
                return m_MouseState;
            }
            set
            {
                if (m_MouseState != value)
                {
                    m_MouseState = value;
                    Control.Invalidate();
                }
            }
        }
        protected virtual Image GetImage()
        {
            switch (MouseState)
            {
                case MouseState.Leave:
                case MouseState.Normal:
                    return GetNormalImage();
                case MouseState.Up:
                case MouseState.Move:
                    return GetMoveImage();
                case MouseState.Down:
                    return GetDownImage();
                default:
                    return null;
            }
        }
        protected abstract Image GetNormalImage();
        protected abstract Image GetMoveImage();
        protected abstract Image GetDownImage();
        protected void RendererBackground(Graphics g, Rectangle rect, Image backgroundImage, bool method)
        {
            if (!method)
            {
                g.DrawImage(backgroundImage, new Rectangle(rect.X + 0, rect.Y, 5, rect.Height), 0, 0, 5, backgroundImage.Height, GraphicsUnit.Pixel);
                g.DrawImage(backgroundImage, new Rectangle(rect.X + 5, rect.Y, rect.Width - 10, rect.Height), 5, 0, backgroundImage.Width - 10, backgroundImage.Height, GraphicsUnit.Pixel);
                g.DrawImage(backgroundImage, new Rectangle(rect.X + rect.Width - 5, rect.Y, 5, rect.Height), backgroundImage.Width - 5, 0, 5, backgroundImage.Height, GraphicsUnit.Pixel);
            }
            else
            {
                RendererBackground(g, rect, 5, backgroundImage);
            }
        }
        /// <summary>
        /// 渲染背景图片,使背景图片不失真
        /// </summary>
        /// <param name="g"></param>
        /// <param name="rect"></param>
        /// <param name="cut"></param>
        /// <param name="backgroundImage"></param>
        protected void RendererBackground(Graphics g, Rectangle rect, int cut, Image backgroundImage)
        {
            //左上角
            g.DrawImage(backgroundImage, new Rectangle(rect.X, rect.Y, cut, cut), 0, 0, cut, cut, GraphicsUnit.Pixel);
            //上边
            g.DrawImage(backgroundImage, new Rectangle(rect.X + cut, rect.Y, rect.Width - cut * 2, cut), cut, 0, backgroundImage.Width - cut * 2, cut, GraphicsUnit.Pixel);
            //右上角
            g.DrawImage(backgroundImage, new Rectangle(rect.X + rect.Width - cut, rect.Y, cut, cut), backgroundImage.Width - cut, 0, cut, cut, GraphicsUnit.Pixel);
            //左边
            g.DrawImage(backgroundImage, new Rectangle(rect.X, rect.Y + cut, cut, rect.Height - cut * 2), 0, cut, cut, backgroundImage.Height - cut * 2, GraphicsUnit.Pixel);
            //左下角
            g.DrawImage(backgroundImage, new Rectangle(rect.X, rect.Y + rect.Height - cut, cut, cut), 0, backgroundImage.Height - cut, cut, cut, GraphicsUnit.Pixel);
            //右边
            g.DrawImage(backgroundImage, new Rectangle(rect.X + rect.Width - cut, rect.Y + cut, cut, rect.Height - cut * 2), backgroundImage.Width - cut, cut, cut, backgroundImage.Height - cut * 2, GraphicsUnit.Pixel);
            //右下角
            g.DrawImage(backgroundImage, new Rectangle(rect.X + rect.Width - cut, rect.Y + rect.Height - cut, cut, cut), backgroundImage.Width - cut, backgroundImage.Height - cut, cut, cut, GraphicsUnit.Pixel);
            //下边
            g.DrawImage(backgroundImage, new Rectangle(rect.X + cut, rect.Y + rect.Height - cut, rect.Width - cut * 2, cut), cut, backgroundImage.Height - cut, backgroundImage.Width - cut * 2, cut, GraphicsUnit.Pixel);
            //平铺中间
            g.DrawImage(backgroundImage, new Rectangle(rect.X + cut, rect.Y + cut, rect.Width - cut * 2, rect.Height - cut * 2), cut, cut, backgroundImage.Width - cut * 2, backgroundImage.Height - cut * 2, GraphicsUnit.Pixel);
        }
        #region IWindowTarget 成员
        void IWindowTarget.OnHandleChange(IntPtr newHandle)
        {
            Target.OnHandleChange(newHandle);
        }
        private BufferedGraphicsContext BufferContext
        {
            get
            {
                return BufferedGraphicsManager.Current;
            }
        }
        internal static IntPtr SetUpPalette(IntPtr dc, bool force, bool realizePalette)
        {
            IntPtr halftonePalette = Graphics.GetHalftonePalette();
            IntPtr ptr2 = SafeNativeMethods.SelectPalette(new HandleRef(null, dc), new HandleRef(null, halftonePalette), force ? 0 : 1);
            if ((ptr2 != IntPtr.Zero) && realizePalette)
            {
                SafeNativeMethods.RealizePalette(new HandleRef(null, dc));
            }
            return ptr2;
        }
        private void WmPaint(ref  Message m)
        {
            bool flag = true;
            IntPtr zero = IntPtr.Zero;
            NativeMethods.PAINTSTRUCT lpPaint = new NativeMethods.PAINTSTRUCT();
            bool flag2 = false;
            try
            {
                IntPtr wParam;
                Rectangle clientRectangle;
                if (m.WParam == IntPtr.Zero)
                {
                    zero = Control.Handle;
                    wParam = UnsafeNativeMethods.BeginPaint(new HandleRef(this, zero), ref lpPaint);
                    flag2 = true;
                    clientRectangle = new Rectangle(lpPaint.rcPaint_left, lpPaint.rcPaint_top, lpPaint.rcPaint_right - lpPaint.rcPaint_left, lpPaint.rcPaint_bottom - lpPaint.rcPaint_top);
                }
                else
                {
                    wParam = m.WParam;
                    clientRectangle = Control.ClientRectangle;
                }
                if (!flag || ((clientRectangle.Width > 0) && (clientRectangle.Height > 0)))
                {
                    IntPtr handle = IntPtr.Zero;
                    BufferedGraphics graphics = null;
                    DotNet.Windows.Forms.Internal.PaintEventArgs e = null;
                    System.Drawing.Drawing2D.GraphicsState gstate = null;
                    try
                    {
                        if (flag || (m.WParam == IntPtr.Zero))
                        {
                            handle = SetUpPalette(wParam, false, false);
                        }
                        if (flag)
                        {
                            try
                            {
                                graphics = this.BufferContext.Allocate(wParam, Control.ClientRectangle);
                            }
                            catch (Exception exception)
                            {
                                if (ClientUtils.IsCriticalException(exception))
                                {
                                    throw;
                                }
                                flag = false;
                            }
                        }
                        if (graphics != null)
                        {
                            graphics.Graphics.SetClip(clientRectangle);
                            e = new DotNet.Windows.Forms.Internal.PaintEventArgs(graphics.Graphics, clientRectangle);
                            gstate = e.Graphics.Save();
                        }
                        else
                        {
                            e = new DotNet.Windows.Forms.Internal.PaintEventArgs(wParam, clientRectangle);
                        }
                        using (e)
                        {
                            try
                            {
                                if (((m.WParam == IntPtr.Zero) && true) || flag)
                                {
                                    this.PaintWithErrorHandling(e, 1);
                                }
                            }
                            finally
                            {
                                if (gstate != null)
                                {
                                    e.Graphics.Restore(gstate);
                                }
                                else
                                {
                                    e.ResetGraphics();
                                }
                            }
                            this.PaintWithErrorHandling(e, 2);
                            if (graphics != null)
                            {
                                graphics.Render();
                            }
                        }
                    }
                    finally
                    {
                        if (handle != IntPtr.Zero)
                        {
                            SafeNativeMethods.SelectPalette(new HandleRef(null, wParam), new HandleRef(null, handle), 0);
                        }
                        if (graphics != null)
                        {
                            graphics.Dispose();
                        }
                    }
                }
            }
            finally
            {
                if (flag2)
                {
                    UnsafeNativeMethods.EndPaint(new HandleRef(this, zero), ref lpPaint);
                }
            }
        }
        protected virtual void OnPaintBackground(DotNet.Windows.Forms.Internal.PaintEventArgs pevent)
        {
            NativeMethods.RECT rect = new NativeMethods.RECT();
            UnsafeNativeMethods.GetClientRect(new HandleRef(this.window, Control.Handle), ref rect);
            this.PaintBackground(pevent, new Rectangle(rect.left, rect.top, rect.right, rect.bottom));
        }
        internal void PaintBackground(DotNet.Windows.Forms.Internal.PaintEventArgs e, Rectangle rectangle)
        {
            this.PaintBackground(e, rectangle, Control.BackColor, Point.Empty);
        }

        internal void PaintBackground(DotNet.Windows.Forms.Internal.PaintEventArgs e, Rectangle rectangle, System.Drawing.Color backColor)
        {
            this.PaintBackground(e, rectangle, backColor, Point.Empty);
        }
        private bool RenderColorTransparent(System.Drawing.Color c)
        {
            return ((c.A < 0xff));
        }
        internal void PaintTransparentBackground(DotNet.Windows.Forms.Internal.PaintEventArgs e, Rectangle rectangle)
        {
            this.PaintTransparentBackground(e, rectangle, null);
        }
        internal static bool IsImageTransparent(Image backgroundImage)
        {
            return ((backgroundImage != null) && ((backgroundImage.Flags & 2) > 0));
        }
        internal static Rectangle CalculateBackgroundImageRectangle(Rectangle bounds, Image backgroundImage, ImageLayout imageLayout)
        {
            Rectangle rectangle = bounds;
            if (backgroundImage != null)
            {
                switch (imageLayout)
                {
                    case ImageLayout.None:
                        rectangle.Size = backgroundImage.Size;
                        return rectangle;

                    case ImageLayout.Tile:
                        return rectangle;

                    case ImageLayout.Center:
                        {
                            rectangle.Size = backgroundImage.Size;
                            Size size = bounds.Size;
                            if (size.Width > rectangle.Width)
                            {
                                rectangle.X = (size.Width - rectangle.Width) / 2;
                            }
                            if (size.Height > rectangle.Height)
                            {
                                rectangle.Y = (size.Height - rectangle.Height) / 2;
                            }
                            return rectangle;
                        }
                    case ImageLayout.Stretch:
                        rectangle.Size = bounds.Size;
                        return rectangle;

                    case ImageLayout.Zoom:
                        {
                            Size size2 = backgroundImage.Size;
                            float num = ((float)bounds.Width) / ((float)size2.Width);
                            float num2 = ((float)bounds.Height) / ((float)size2.Height);
                            if (num >= num2)
                            {
                                rectangle.Height = bounds.Height;
                                rectangle.Width = (int)((size2.Width * num2) + 0.5);
                                if (bounds.X >= 0)
                                {
                                    rectangle.X = (bounds.Width - rectangle.Width) / 2;
                                }
                                return rectangle;
                            }
                            rectangle.Width = bounds.Width;
                            rectangle.Height = (int)((size2.Height * num) + 0.5);
                            if (bounds.Y >= 0)
                            {
                                rectangle.Y = (bounds.Height - rectangle.Height) / 2;
                            }
                            return rectangle;
                        }
                }
            }
            return rectangle;
        }
        internal static void DrawBackgroundImage(Graphics g, Image backgroundImage, Color backColor, ImageLayout backgroundImageLayout, Rectangle bounds, Rectangle clipRect, Point scrollOffset, RightToLeft rightToLeft)
        {
            if (g == null)
            {
                throw new ArgumentNullException("g");
            }
            if (backgroundImageLayout == ImageLayout.Tile)
            {
                using (TextureBrush brush = new TextureBrush(backgroundImage, WrapMode.Tile))
                {
                    if (scrollOffset != Point.Empty)
                    {
                        Matrix transform = brush.Transform;
                        transform.Translate((float)scrollOffset.X, (float)scrollOffset.Y);
                        brush.Transform = transform;
                    }
                    g.FillRectangle(brush, clipRect);
                    return;
                }
            }
            Rectangle rect = CalculateBackgroundImageRectangle(bounds, backgroundImage, backgroundImageLayout);
            if ((rightToLeft == RightToLeft.Yes) && (backgroundImageLayout == ImageLayout.None))
            {
                rect.X += clipRect.Width - rect.Width;
            }
            using (SolidBrush brush2 = new SolidBrush(backColor))
            {
                g.FillRectangle(brush2, clipRect);
            }
            if (!clipRect.Contains(rect))
            {
                if ((backgroundImageLayout == ImageLayout.Stretch) || (backgroundImageLayout == ImageLayout.Zoom))
                {
                    rect.Intersect(clipRect);
                    g.DrawImage(backgroundImage, rect);
                }
                else if (backgroundImageLayout == ImageLayout.None)
                {
                    rect.Offset(clipRect.Location);
                    Rectangle destRect = rect;
                    destRect.Intersect(clipRect);
                    Rectangle rectangle3 = new Rectangle(Point.Empty, destRect.Size);
                    g.DrawImage(backgroundImage, destRect, rectangle3.X, rectangle3.Y, rectangle3.Width, rectangle3.Height, GraphicsUnit.Pixel);
                }
                else
                {
                    Rectangle rectangle4 = rect;
                    rectangle4.Intersect(clipRect);
                    Rectangle rectangle5 = new Rectangle(new Point(rectangle4.X - rect.X, rectangle4.Y - rect.Y), rectangle4.Size);
                    g.DrawImage(backgroundImage, rectangle4, rectangle5.X, rectangle5.Y, rectangle5.Width, rectangle5.Height, GraphicsUnit.Pixel);
                }
            }
            else
            {
                ImageAttributes imageAttr = new ImageAttributes();
                imageAttr.SetWrapMode(WrapMode.TileFlipXY);
                g.DrawImage(backgroundImage, rect, 0, 0, backgroundImage.Width, backgroundImage.Height, GraphicsUnit.Pixel, imageAttr);
                imageAttr.Dispose();
            }
        }
        internal void PaintTransparentBackground(DotNet.Windows.Forms.Internal.PaintEventArgs e, Rectangle rectangle, System.Drawing.Region transparentRegion)
        {
            Graphics g = e.Graphics;
            Control parentInternal = Control.Parent;
            if (parentInternal != null)
            {
                if (Application.RenderWithVisualStyles) // parentInternal.RenderTransparencyWithVisualStyles)
                {
                    System.Drawing.Drawing2D.GraphicsState gstate = null;
                    if (transparentRegion != null)
                    {
                        gstate = g.Save();
                    }
                    try
                    {
                        if (transparentRegion != null)
                        {
                            g.Clip = transparentRegion;
                        }
                        ButtonRenderer.DrawParentBackground(g, rectangle, Control);
                        return;
                    }
                    finally
                    {
                        if (gstate != null)
                        {
                            g.Restore(gstate);
                        }
                    }
                }
                Rectangle rectangle2 = new Rectangle(-Control.Left, -Control.Top, parentInternal.Width, parentInternal.Height);
                Rectangle clipRect = new Rectangle(rectangle.Left + Control.Left, rectangle.Top + Control.Top, rectangle.Width, rectangle.Height);
                using (WindowsGraphics graphics2 = WindowsGraphics.FromGraphics(g))
                {
                    graphics2.DeviceContext.TranslateTransform(-Control.Left, -Control.Top);
                    using (DotNet.Windows.Forms.Internal.PaintEventArgs args = new DotNet.Windows.Forms.Internal.PaintEventArgs(graphics2.GetHdc(), clipRect))
                    {
                        if (transparentRegion != null)
                        {
                            args.Graphics.Clip = transparentRegion;
                            args.Graphics.TranslateClip(-rectangle2.X, -rectangle2.Y);
                        }
                        try
                        {
                            //this.InvokePaintBackground(parentInternal, args);
                            //this.InvokePaint(parentInternal, args);
                        }
                        finally
                        {
                            if (transparentRegion != null)
                            {
                                args.Graphics.TranslateClip(rectangle2.X, rectangle2.Y);
                            }
                        }
                    }
                    return;
                }
            }
            g.FillRectangle(SystemBrushes.Control, rectangle);
        }
        internal void PaintBackground(DotNet.Windows.Forms.Internal.PaintEventArgs e, Rectangle rectangle, System.Drawing.Color backColor, Point scrollOffset)
        {
            backColor = Color.Transparent;
            //ControlStyles.SupportsTransparentBackColor;
            this.PaintTransparentBackground(e, rectangle);
            //if (this.RenderColorTransparent(backColor))
            //{
            //    this.PaintTransparentBackground(e, rectangle);
            //}
            bool flag = ((Control is FormBase) || (this is MdiClient)) && Control.IsMirrored;
            if (((Control.BackgroundImage != null) && !SystemInformation.HighContrast) && !flag)
            {
                if ((Control.BackgroundImageLayout == ImageLayout.Tile) && IsImageTransparent(Control.BackgroundImage))
                {
                    PaintTransparentBackground(e, rectangle);
                }
                Point autoScrollPosition = scrollOffset;
                if ((Control is ScrollableControl) && (autoScrollPosition != Point.Empty))
                {
                    autoScrollPosition = ((ScrollableControl)(Control)Control).AutoScrollPosition;
                }
                if (IsImageTransparent(Control.BackgroundImage))
                {
                    PaintBackColor(e, rectangle, backColor);
                }
                DrawBackgroundImage(e.Graphics, Control.BackgroundImage, backColor, Control.BackgroundImageLayout, Control.ClientRectangle, rectangle, autoScrollPosition, Control.RightToLeft);
            }
            else
            {
                PaintBackColor(e, rectangle, backColor);
            }
        }
        private static void PaintBackColor(DotNet.Windows.Forms.Internal.PaintEventArgs e, Rectangle rectangle, System.Drawing.Color backColor)
        {
            System.Drawing.Color nearestColor = backColor;
            if (nearestColor.A == 0xff)
            {
                using (WindowsGraphics graphics = ((e.HDC != IntPtr.Zero) && ((short)Screen.PrimaryScreen.BitsPerPixel > 8)) ? WindowsGraphics.FromHdc(e.HDC) : WindowsGraphics.FromGraphics(e.Graphics))
                {
                    nearestColor = graphics.GetNearestColor(nearestColor);
                    using (WindowsBrush brush = new WindowsSolidBrush(graphics.DeviceContext, nearestColor))
                    {
                        graphics.FillRectangle(brush, rectangle);
                    }
                    return;
                }
            }
            if (nearestColor.A > 0)
            {
                using (Brush brush2 = new SolidBrush(nearestColor))
                {
                    e.Graphics.FillRectangle(brush2, rectangle);
                }
            }
        }
        private void PaintWithErrorHandling(DotNet.Windows.Forms.Internal.PaintEventArgs e, short layer)
        {
            try
            {
                this.CacheTextInternal = true;
                bool flag = true;
                try
                {
                    switch (layer)
                    {
                        case 1:
                            this.OnPaintBackground(e);
                            break;
                        case 2:
                            this.OnPaint(e);
                            break;
                    }
                    flag = false;
                }
                finally
                {
                    if (flag)
                    {
                        this.SetState(0x400000, true);
                        Control.Invalidate();
                    }
                }
            }
            finally
            {
                this.CacheTextInternal = false;
            }
        }
        void IWindowTarget.OnMessage(ref Message m)
        {
            if (m.Msg == 15)
            {
                WmPaint(ref m);
                return;
            }
            Target.OnMessage(ref m);
        }

        #endregion
    }
}

在PreFilterMessage中接受音信时,可以选拔Control.FromHandle拿到窗口对应的控件对象,原型如下:

View Code

?

 

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//Declaring Type: System.Windows.Forms.Control //Assembly: System.Windows.Forms, Version=2.0.0.0 public static Control FromHandle(IntPtr handle);通过这种方式可以监测各消息的信息来自哪个控件。
public bool PreFilterMessage(ref Message msg)
{
   Control c = Control.FromHandle(msg.HWnd);
   if (c == null)
      System.Diagnostics.Debug.WriteLine("Filter:NULL" +"-" + msg.ToString());
   else
      System.Diagnostics.Debug.WriteLine("Filter:" +c.Name+"-"+ msg.ToString());
   return false;
}

 

从Visual Studio的出口窗口监视到的调试输出如下图所示:

 

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http://files.cnblogs.com/dotnet-org-cn/DotNet.Framework.rar

 

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