制作类似MSN Messager的任务栏图标及消息滚动窗口

• Download C# source files - 4.57 Kb
• Download C# demo project - 126 Kb

    

特性说明

MSN messenger 支持的消息弹出机制：

• 自定义透明位图背景
• 关闭按钮的3种状态样式
• 文字标题按钮
• 内容可点击
• 矩形选框
• 自定义鼠标处于或离开选框上时的文字颜色、字体
• 动画加速叁数

类的运用

• 首先复制TaskbarNotifier.cs 文件到项目所在的目录
• 加入下面的代码：

  using CustomUIControls;

• 在类中加入成员变量：

  TaskbarNotifier taskbarNotifier;

• 在构造器中加入下面的行：
  taskbarNotifier=new TaskbarNotifier();
  
  taskbarNotifier.SetBackgroundBitmap("skin.bmp", Color.FromArgb(255,0,255));
  
  taskbarNotifier.SetCloseBitmap("close.bmp", Color.FromArgb(255,0,255),new Point(127,8));
  
  taskbarNotifier.TitleRectangle=new Rectangle(40,9,70,25);
  
  taskbarNotifier.ContentRectangle=new Rectangle(8,41,133,68);
  
  taskbarNotifier.TitleClick+=new EventHandler(TitleClick);
  
  taskbarNotifier.ContentClick+=new EventHandler(ContentClick);
  
  taskbarNotifier.CloseClick+=new EventHandler(CloseClick);

  说明:

  taskbarNotifier.SetBackgroundBitmap("skin.bmp", Color.FromArgb(255,0,255));
  taskbarNotifier.SetCloseBitmap("close.bmp",Color.FromArgb(255,0,255),new Point(127,8));
  
  

  第一行代码设置背景外观的图片样式和透明度；第二行代码设置3个状态下关闭按钮的透明度及其在窗口中的位置（可选项）;

taskbarNotifier.TitleRectangle=new Rectangle(40,9,70,25);

taskbarNotifier.ContentRectangle=new Rectangle(8,41,133,68);

这两行定义矩形框中的标题和内容，下面是标题、内容、关闭按钮的的点击事件：

taskbarNotifier.TitleClick+=new EventHandler(OnTitleClick);

taskbarNotifier.ContentClick+=new EventHandler(OnContentClick);

taskbarNotifier.CloseClick+=new EventHandler(OnCloseClick);

• 调用下面的方法就可以了： 

  taskbarNotifier.Show("TitleText","ContentText",500,3000,500);

  动态显示弹出窗口的3种状态 showing/visible/hiding，将时间延迟设置为500ms/3000ms/500ms

• 可以控制一些属性项：

           标题/内容的字体、颜色；设置标题/内容/关闭按钮的点击或离开时的事件；可以禁用矩形框的聚集(focus)；查看更多内容（的按钮）

类文件方法

void Show(string strTitle, string strContent, int nTimeToShow, int nTimeToStay, int nTimeToHide)

        显示弹击窗体所需的时间参数:
        strTitle: 弹出消息窗口标题, string 型 
    strContent: 弹出消息窗口的内容;string型 
        nTimeToShow: 动态显示时间(滚动效果快慢程度)(毫秒) 
    nTimeToStay: 窗体持续显示时长(毫秒)
        nTimeToHide: 持续多久后自动隐藏

void Hide() 可将popup隐藏

void SetBackgroundBitmap(string strFilename, Color transparencyColor)
        设置背景外观的位图样式及其透明度
        strFilename:要作为背景位图在硬盘中的路径
        transparencyColor: 不可见时的位图颜色

void SetBackgroundBitmap(Image image, Color transparencyColor)

        设置背景外观的位图样式及其透明度:
    image: 背景图片;
        transparencyColor: 不可见时的位图颜色

void SetCloseBitmap(string strFilename, 

            Color transparencyColor, Point position)

    设置3 个状态下关闭按钮位图，它的透明度和它的座标

• strFilename: 3种状态下关闭按钮位图在磁盘上的路径(width must be a multiple of 3)
• transparencyColor: 不可见时的位图颜色(Color of the bitmap which won't be visible)
• position: 关闭按钮的位置

void SetCloseBitmap(Image image, Color transparencyColor, Point position)

        设置3 个状态下关闭按钮位图，它的透明度和它的座标
        图象: 图象/位图 代表3个状态下关闭按钮位图的对象(宽度必须是3倍) 
    透明度：不可见时的位图颜色
    位置: 关闭按钮在popup上的位置

• 属性列表:

string TitleText (get/set)

string ContentText (get/set)

TaskbarStates TaskbarState (get)

Color NormalTitleColor (get/set)

Color HoverTitleColor (get/set)

Color NormalContentColor (get/set)

Color HoverContentColor (get/set)

Font NormalTitleFont (get/set)

Font HoverTitleFont (get/set)

Font NormalContentFont (get/set)

Font HoverContentFont (get/set)

Rectangle TitleRectangle (get/set) //must be defined before calling show())

Rectangle ContentRectangle (get/set) //must be defined before calling show())

bool TitleClickable (get/set) (default = false);

bool ContentClickable (get/set) (default = true);

bool CloseClickable (get/set) (default = true);

bool EnableSelectionRectangle (get/set) (default = true);

        事件:

     event EventHandler CloseClick

     event EventHandler TitleClick

     event EventHandler ContentClick

Technical issues

The popup is skinned using a region generated dynamically from a bitmap and a transparency color:

protected Region BitmapToRegion(Bitmap bitmap, Color transparencyColor)

{

    if (bitmap == null)

        throw new ArgumentNullException("Bitmap", "Bitmap cannot be null!");



    int height = bitmap.Height;

    int width = bitmap.Width;



    GraphicsPath path = new GraphicsPath();



    for (int j=0; j<height; j++ )

        for (int i=0; i<width; i++)

        {

            if (bitmap.GetPixel(i, j) == transparencyColor)

                continue;



            int x0 = i;



            while ((i < width) && 

                    (bitmap.GetPixel(i, j) != transparencyColor))

                i++;



            path.AddRectangle(new Rectangle(x0, j, i-x0, 1));

        }



    Region region = new Region(path);

    path.Dispose();

    return region;

}







The refresh() of the popup is done using the double buffering technique to avoid flickering:

protected override void OnPaintBackground(PaintEventArgs pea)

{

    Graphics grfx = pea.Graphics;

    grfx.PageUnit = GraphicsUnit.Pixel;



    Graphics offScreenGraphics;

    Bitmap offscreenBitmap;



    offscreenBitmap = new Bitmap(BackgroundBitmap.Width, 

                                BackgroundBitmap.Height);

    offScreenGraphics = Graphics.FromImage(offscreenBitmap);



    if (BackgroundBitmap != null)

    {

        offScreenGraphics.DrawImage(BackgroundBitmap, 

            0, 0, BackgroundBitmap.Width, BackgroundBitmap.Height);

    }



    DrawCloseButton(offScreenGraphics);

    DrawText(offScreenGraphics);



    grfx.DrawImage(offscreenBitmap, 0, 0);

}

Bugs/Limitations

Since I wanted to keep only managed code, I used the Screen.GetWorkingArea(WorkAreaRectangle) function instead of using unmanaged code to get the taskbar position. As a result, I made the popup always appear at the bottom of WorkAreaRectangle whichever position the taskbar has.

I didn't find any C# managed equivalent to the Win32 function ShowWindow(SW_SHOWNOACTIVATE) to make the popup, not steal the focus of the active window.

Updates

• 01 April 2003: Small bug fix in the OnMouseUp handler.
• 11 January 2003: Patrick Vanden Driessche updated both the C# and VB.NET versions:
  • The popup now doesn't close automatically when the mouse is still over it
  • The popup is shown again when it was disappearing and the mouse comes over it
  • A few other bugs have been corrected.
• 10 January 2003: A port of TaskbarNotifier has been done by Patrick Vanden Driessche in VB.NET
• 05 December 2002: The popup is now shown using the Win32 function ShowWindow(SW_SHOWNOACTIVATE), to prevent the popup from stealing the focus.