为MenuStrip增加一个渲染器

Dear 丶 2021-12-10 03:39 226阅读 0赞

Office 2007 的菜单效果真的是绚丽，但在应该的专业领域的应用开发中大部分都不是很需要这效果，虽然很多的Ribbon能达到这效果，但同VS提供的可视化开发还是存在很大的差距，VS的可视化开发速度快，效率高，操作简单，容易上手。但有时为了更近人的界面，我们也可以给MenuStrip装饰一下。

MenuStrip是通过MenuStripRenderer来完成菜单的绘制效果的，Framework有三个渲染器，我们就继承其中一个，通过让重写其中的部分方法来达到不同的效果。

这里实现的功能有：为菜单或工具栏添加一个水印。菜单的图标或工具栏的图标做一个鼠标移进时加亮的效果（只需一张图片即可实现）。至于重给菜单或工具栏的底色，用户可以自己实现。

1.继承ToolStripProfessionalRenderer

ToolStripProfessionalRenderer就是从工具箱拖出ToolStrip的默认效果

属性：WatermarkImage  水印图片

属性：WatermarkTransparency 透明效果（0-255）

属性：WatermarkGrayEffect  是否使用灰度效果

属性：BrightValue  鼠标进入时图片增加亮度的效果

图片增亮和水印效果是数字图像处理技术，具体的算法，可以在网上查找，这里有个透明的效果是经过自己研究出来的。

重写OnRenderItemImage方法，判断菜单项的状态，把正常的图片或增亮的图片赋给Renderer。

重写OnRenderToolStripBackground方法，实现水印功能

![Watermark.jpg][]

代码片段：

/\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*  
 \* 文件名称：JWMenuStripRenderer.cs  
 \*  
 \* 功能描述：菜单 渲染器。更改鼠标进入时图片自动增亮的功能。  
 \*  
 \* 创建日期：2009-10-16  
 \*  
 \* 创 建 人：Lance Yang  
 \*  
 \* 修改：  
 \*      2009-10-15     Lance Yang       -修改内容。  
 \*  
 \* \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*/  
using System;  
using System.Collections.Generic;  
using System.Text;  
using System.Windows.Forms;  
using System.Drawing;  
using System.Drawing.Drawing2D;

namespace LC.Client.Controls  
\{  
    /// <summary>  
    /// ToolStrip 渲染器。更改背景为过度显示和鼠标进入时图片自动增亮的功能。  
    /// </summary>  
    public class LCMenuStripRenderer : ToolStripProfessionalRenderer  
    \{  
        List<EtyImageState> m\_ImageList = new List<EtyImageState>();

public LCMenuStripRenderer()  
        \{  
            this.RoundedEdges = false;  
        \}

private int m\_WatermarkTransparency = 255;  
        /// <summary>  
        /// 水印显示的透明度。  
        /// </summary>  
        ///  
        public int WatermarkTransparency  
        \{  
            get \{ return m\_WatermarkTransparency; \}  
            set  
            \{  
                if (value > 255 || value < 0)  
                    throw new Exception("请输入 0 - 255 之间的一个数值。");

m\_WatermarkTransparency = value;  
                WatermarkImage = m\_WatermarkImage;  
            \}  
        \}

private bool m\_watermarkGrayEffect = false;

/// <summary>  
        /// 水印的灰度效果，默认为 false;  
        /// </summary>  
        ///          
        public bool WatermarkGrayEffect  
        \{  
            get \{ return m\_watermarkGrayEffect; \}  
            set  
            \{  
                m\_watermarkGrayEffect = value;  
                WatermarkImage = m\_WatermarkImage;  
            \}  
        \}

private Bitmap m\_WatermarkImage;  
        /// <summary>  
        /// 水印的图片。  
        /// </summary>  
        ///  
        public Bitmap WatermarkImage  
        \{  
            get \{ return m\_WatermarkImage; \}  
            set  
            \{  
                m\_WatermarkImage = value;  
                //制作水印  
                if (value != null)  
                \{  
                    Bitmap img = new Bitmap(value);

if (m\_watermarkGrayEffect)  
                        ImageTool.GrayByPixels(img);  
                    if (m\_WatermarkTransparency != 255)  
                        ImageTool.WatermarkImage(img, m\_WatermarkTransparency);

m\_WatermarkImage = img;  
                \}  
                else  
                    m\_WatermarkImage = null;

\}  
        \}

private int m\_brightValue = 26;  
        /// <summary>  
        /// 鼠标进入时的图片增亮值。默认为 26  
        /// </summary>  
        public int BrightValue  
        \{  
            get \{ return m\_brightValue; \}  
            set \{ m\_brightValue = value; \}  
        \}

protected override void OnRenderItemImage(ToolStripItemImageRenderEventArgs e)  
        \{  
            Bitmap img = e.Image as Bitmap;  
            if (img != null)  
            \{  
                bool isEqualsInitImage = false;  
                EtyImageState ety = EtyImageState.GetEtyImageState(m\_ImageList, img.GetHashCode(), out isEqualsInitImage);  
                if (ety == null)  
                \{  
                    ety = new EtyImageState();  
                    ety.InitImage = img;  
                    ety.LightImage = ImageTool.Brightness(img, m\_brightValue);  
                    m\_ImageList.Add(ety);  
                \}

if (e.Item.Selected)  
                    e.Item.Image = ety.LightImage;  
                else  
                    e.Item.Image = ety.InitImage;  
            \}  
            base.OnRenderItemImage(e);  
        \}

int borderPadding = 2;  
        /// <summary>  
        /// 水印的边距，默认为2  
        /// </summary>  
        public int WatermarkPadding  
        \{  
            get \{ return borderPadding; \}  
            set \{ borderPadding = value; \}  
        \}

protected override void OnRenderToolStripBackground(ToolStripRenderEventArgs e)  
        \{  
            base.OnRenderToolStripBackground(e);

if (e.ToolStrip is ToolStripDropDown)    //过滤，根据需要可能还有更多的过滤  
                return;

System.Diagnostics.Debug.WriteLine("显示水印");  
            //显示水印。  
            if (m\_WatermarkImage != null)  
            \{  
                Point position = Point.Empty;  
                int top = borderPadding;  
                int left = 0;  
                int width = 0;  
                int height = 0;  
                if (m\_WatermarkImage.Height > e.ToolStrip.Height - borderPadding \* 2)  
                \{  
                    //重新定义图片的显示宽高  
                    double rate = (double)m\_WatermarkImage.Width / (double)m\_WatermarkImage.Height;  
                    height = e.ToolStrip.Height - borderPadding \* 2;  
                    width = Convert.ToInt32(rate \* height);  
                \}  
                else  
                \{  
                    width = m\_WatermarkImage.Width;  
                    height = m\_WatermarkImage.Height;  
                    top = (e.ToolStrip.Height - height) / 2;

\}  
                left = e.ToolStrip.Width - width - borderPadding \* 2;

position = new Point(left, top);  
                Rectangle rect = new Rectangle(left, top, width, height);  
                e.Graphics.DrawImage(m\_WatermarkImage, rect, new Rectangle(0, 0, m\_WatermarkImage.Width, m\_WatermarkImage.Height), GraphicsUnit.Pixel);  
            \}  
        \}  
    \}  
\}

/// <summary>  
    /// 为保存图片的状态而设  
    /// </summary>  
    internal class EtyImageState  
    \{  
        public int InitImageKey  
        \{  
            get  
            \{  
                if (m\_InitImage == null)  
                    return -1;  
                else  
                    return m\_InitImage.GetHashCode();  
            \}  
        \}

private Image m\_InitImage;

public Image InitImage  
        \{  
            get \{ return m\_InitImage; \}  
            set \{ m\_InitImage = value; \}  
        \}

public int LightImageKey  
        \{  
            get  
            \{  
                if (m\_LightImage == null)  
                    return -1;  
                else  
                    return m\_LightImage.GetHashCode();  
            \}  
        \}

private Image m\_LightImage;

public Image LightImage  
        \{  
            get \{ return m\_LightImage; \}  
            set \{ m\_LightImage = value; \}  
        \}

/// <summary>  
        /// 从集合  
        /// </summary>  
        /// <param name="list"></param>  
        /// <param name="key"></param>  
        /// <returns></returns>  
        public static EtyImageState GetEtyImageState(List<EtyImageState> list, int key, out bool isEqualsInitImage)  
        \{  
            isEqualsInitImage = false;  
            EtyImageState retEty = null;  
            foreach (EtyImageState ety in list)  
            \{  
                if (ety.InitImageKey == key)  
                \{  
                    isEqualsInitImage = true;  
                    retEty = ety;  
                    break;  
                \}  
                else if (ety.LightImageKey == key)  
                \{  
                    retEty = ety;  
                    break;  
                \}  
            \}  
            return retEty;  
        \}

数字处理算法类：

using System;  
using System.Collections.Generic;  
using System.Text;  
using System.Drawing;  
using System.IO;  
using System.Drawing.Imaging;  
using System.Drawing.Drawing2D;

namespace LC.Client.Controls  
\{  
    public static class ImageTool  
    \{  
        /// <summary>  
        /// 根据字符串生成图片。  
        /// </summary>  
        /// <param name="data"></param>  
        /// <returns></returns>  
        public static Bitmap DeserializeFromBase64(string data)  
        \{  
            // Decode the string and create a memory stream  
            // on the decoded string data.  
            MemoryStream stream =  
                new MemoryStream(Convert.FromBase64String(data));

// Create a new bitmap from the stream.  
            Bitmap b = new Bitmap(stream);

return b;  
        \}  
        //图片 转为    base64编码的文本  
        public static string ImgToBase64String(Image bmp)  
        \{  
            MemoryStream ms = new MemoryStream();  
            bmp.Save(ms, bmp.RawFormat);  
            byte\[\] arr = new byte\[ms.Length\];  
            ms.Position = 0;  
            ms.Read(arr, 0, (int)ms.Length);  
            ms.Close();  
            String strbase64 = Convert.ToBase64String(arr);  
            return strbase64;  
        \}

/// <summary>  
        /// 图片增亮。  
        /// </summary>  
        /// <param name="img"></param>  
        /// <returns></returns>  
        public static Image Brightness(Image img, int brightValue)  
        \{  
            int percent = brightValue;  
            Single v = 0.006F \* percent;  
            Single\[\]\[\] matrix = \{  
                new Single\[\] \{ 1, 0, 0, 0, 0 \},  
                new Single\[\] \{ 0, 1, 0, 0, 0 \},  
                new Single\[\] \{ 0, 0, 1, 0, 0 \},  
                new Single\[\] \{ 0, 0, 0, 1, 0 \},  
                new Single\[\] \{ v, v, v, 0, 1 \}  
            \};  
            System.Drawing.Imaging.ColorMatrix cm = new System.Drawing.Imaging.ColorMatrix(matrix);  
            System.Drawing.Imaging.ImageAttributes attr = new System.Drawing.Imaging.ImageAttributes();  
            attr.SetColorMatrix(cm);  
            //Image tmp  
            //Image tmp = (Image)img.Clone();  
            Bitmap tmp = new Bitmap(img);  
            Graphics g = Graphics.FromImage(tmp);  
            try  
            \{  
                Rectangle destRect = new Rectangle(0, 0, img.Width, img.Height);  
                g.DrawImage(tmp, destRect, 0, 0, tmp.Width, tmp.Height, GraphicsUnit.Pixel, attr);  
            \}  
            finally  
            \{  
                g.Dispose();  
            \}

return tmp;

//处理不了透明的背景  
        /// <summary>  
        /// 制作水印图片  
        /// </summary>  
        /// <param name="iTheImage">要制作水印的图片</param>  
        /// <param name="width">制作水印的宽</param>  
        /// <param name="height">制作水印的高</param>  
        /// <returns></returns>  
        public static Bitmap WatermarkImage(Bitmap iTheImage, int width, int height)  
        \{  
            //Bitmap watermark = new Bitmap(width, height,  
            //        PixelFormat.Format24bppRgb);  
            Bitmap watermark = new Bitmap(iTheImage);

Graphics g = Graphics.FromImage(watermark);  
            g.Clear(Color.White);  
            //g.Clear(iTheImage.GetPixel(0,0));  
            g.SmoothingMode = SmoothingMode.HighQuality;  
            g.InterpolationMode = InterpolationMode.High;

ImageAttributes imageAttributes = new ImageAttributes();  
            ColorMap colorMap = new ColorMap();

colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);  
            colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);  
            ColorMap\[\] remapTable = \{ colorMap \};

imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);

float\[\]\[\] colorMatrixElements = \{  
                                                new float\[\] \{1.0f, 0.0f, 0.0f, 0.0f, 0.0f\},  
                                                new float\[\] \{0.0f, 1.0f, 0.0f, 0.0f, 0.0f\},  
                                                new float\[\] \{0.0f, 0.0f, 1.0f, 0.0f, 0.0f\},  
                                                new float\[\] \{0.0f, 0.0f, 0.0f, 0.3f, 0.0f\},  
                                                new float\[\] \{0.0f, 0.0f, 0.0f, 0.0f, 1.0f\}  
                                            \};

ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElements);

imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);

\#region 保留学习

int WatermarkWidth = 0;  
            int WatermarkHeight = 0;  
            double bl = 1d;

//计算水印图片的比率  
            //取背景的1/4宽度来比较  
            if ((width > watermark.Width \* 4) && (height > watermark.Height \* 4))  
            \{  
                bl = 1;  
            \}  
            else if ((width > watermark.Width \* 4) && (height < watermark.Height \* 4))  
            \{  
                bl = Convert.ToDouble(height / 4) / Convert.ToDouble(watermark.Height);

\}  
            else if ((width < watermark.Width \* 4) && (height > watermark.Height \* 4))  
            \{  
                bl = Convert.ToDouble(width / 4) / Convert.ToDouble(watermark.Width);  
            \}  
            else  
            \{  
                if ((width \* watermark.Height) > (height \* watermark.Width))  
                \{  
                    bl = Convert.ToDouble(height / 4) / Convert.ToDouble(watermark.Height);

\}  
                else  
                \{  
                    bl = Convert.ToDouble(width / 4) / Convert.ToDouble(watermark.Width);

WatermarkWidth = Convert.ToInt32(watermark.Width \* bl);  
            WatermarkHeight = Convert.ToInt32(watermark.Height \* bl);

switch (\_watermarkPosition)  
            \{  
                case "WM\_TOP\_LEFT":  
                    xpos = 10;  
                    ypos = 10;  
                    break;  
                case "WM\_TOP\_RIGHT":  
                    xpos = \_width - WatermarkWidth - 10;  
                    ypos = 10;  
                    break;  
                case "WM\_BOTTOM\_RIGHT":  
                    xpos = \_width - WatermarkWidth - 10;  
                    ypos = \_height - WatermarkHeight - 10;  
                    break;  
                case "WM\_BOTTOM\_LEFT":  
                    xpos = 10;  
                    ypos = \_height - WatermarkHeight - 10;  
                    break;  
            \}

\#endregion

try  
            \{  
                Rectangle destRect = new Rectangle(0, 0, watermark.Width, watermark.Height);

g.DrawImage(iTheImage, destRect, 0, 0, watermark.Width, watermark.Height,  
                    GraphicsUnit.Pixel,  
                    imageAttributes);  
            \}  
            finally  
            \{  
                imageAttributes.Dispose();  
                g.Dispose();  
            \}

return watermark;  
        \}

/// <summary>  
        /// 制作透明的图片。对透明背景保留原来的样子。  
        /// </summary>  
        /// <param name="bmpobj"></param>  
        /// <param name="transValue">透明度 (0 - 255)</param>  
        public static void WatermarkImage(Bitmap bmpobj, int transValue)  
        \{  
            for (int i = 0; i < bmpobj.Height; i++)  
            \{  
                for (int j = 0; j < bmpobj.Width; j++)  
                \{  
                    Color dot = bmpobj.GetPixel(j, i);  
                    if (dot.A > 0)  
                    \{  
                        bmpobj.SetPixel(j, i, Color.White);  
                        bmpobj.SetPixel(j,i,Color.FromArgb(transValue,dot.R,dot.G,dot.B));  
                    \}  
                \}  
            \}  
        \}

/// <summary>  
        /// 灰度转换,逐点方式  
        /// </summary>  
        public static void GrayByPixels(Bitmap bmpobj)  
        \{  
            for (int i = 0; i < bmpobj.Height; i++)  
            \{  
                for (int j = 0; j < bmpobj.Width; j++)  
                \{  
                    Color dot = bmpobj.GetPixel(j, i);  
                    if (dot.A > 0)  
                    \{  
                        int tmpValue = GetGrayNumColor(dot);  
                        bmpobj.SetPixel(j, i, Color.FromArgb(tmpValue, tmpValue, tmpValue));  
                    \}  
                \}  
            \}  
        \}  
        /// <summary>  
        /// 根据RGB，计算灰度值  
        /// </summary>  
        /// <param name="posClr">Color值</param>  
        /// <returns>灰度值，整型</returns>  
        private static int GetGrayNumColor(System.Drawing.Color posClr)  
        \{  
            return (posClr.R \* 19595 + posClr.G \* 38469 + posClr.B \* 7472) >> 16;  
        \}

public static bool Invert(Bitmap b)  
        \{  
            BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height),  
               ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);  
            int stride = bmData.Stride;  
            System.IntPtr Scan0 = bmData.Scan0;  
            unsafe  
            \{  
                byte\* p = (byte\*)(void\*)Scan0;  
                int nOffset = stride - b.Width \* 3;  
                int nWidth = b.Width \* 3;  
                for (int y = 0; y < b.Height; ++y)  
                \{  
                    for (int x = 0; x < nWidth; ++x)  
                    \{  
                        p\[0\] = (byte)(255 - p\[0\]);  
                        ++p;  
                    \}  
                    p += nOffset;  
                \}  
            \}  
            b.UnlockBits(bmData);  
            return true;  
        \}

public static bool Gray(Bitmap b)  
        \{  
            BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height),  
                      ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);  
            int stride = bmData.Stride;  
            System.IntPtr Scan0 = bmData.Scan0;  
            unsafe  
            \{  
                byte\* p = (byte\*)(void\*)Scan0;  
                int nOffset = stride - b.Width \* 3;  
                byte red, green, blue;  
                for (int y = 0; y < b.Height; ++y)  
                \{  
                    for (int x = 0; x < b.Width; ++x)  
                    \{  
                        blue = p\[0\];  
                        green = p\[1\];  
                        red = p\[2\];  
                        p\[0\] = p\[1\] = p\[2\] = (byte)(.299 \* red + .587 \* green + .114 \* blue);  
                        p += 3;  
                    \}  
                    p += nOffset;  
                \}  
            \}  
            b.UnlockBits(bmData);  
            return true;  
        \}

public static bool Brightness(Bitmap b, int nBrightness)  
        \{  
            if (nBrightness < -255 || nBrightness > 255)  
                return false;  
            BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width,  
                                        b.Height), ImageLockMode.ReadWrite,  
                                        PixelFormat.Format24bppRgb);  
            int stride = bmData.Stride;  
            System.IntPtr Scan0 = bmData.Scan0;  
            int nVal = 0;  
            unsafe  
            \{  
                byte\* p = (byte\*)(void\*)Scan0;  
                int nOffset = stride - b.Width \* 3;  
                int nWidth = b.Width \* 3;  
                for (int y = 0; y < b.Height; ++y)  
                \{  
                    for (int x = 0; x < nWidth; ++x)  
                    \{  
                        nVal = (int)(p\[0\] + nBrightness);  
                        if (nVal < 0) nVal = 0;  
                        if (nVal > 255) nVal = 255;  
                        p\[0\] = (byte)nVal;  
                        ++p;  
                    \}  
                    p += nOffset;  
                \}  
            \}  
            b.UnlockBits(bmData);  
            return true;  
        \}  
    \}  
\}

转载于:https://www.cnblogs.com/Yjianyong/archive/2011/02/11/1951254.html

[Watermark.jpg]: /images/20211209/1de344ce126f4ce6a8bf556101c1a16c.png