C# Winform 窗体美化（三、不规则窗体）

三、不规则窗体

概况

之前学习的 LayeredSkin 看到里面有个异形窗口，比较感兴趣，所以就找一下资料研究一下。不规则窗体学习有一个比较好的例子，叫 GoldFishProject，是一条鱼金鱼在屏幕上游。

不规则窗口示例代码
GoldFishProject 游动金鱼的学习代码

如果没有积分，也可以关注我获取哟~

现学习了两种实现方式：

UpdateLayeredWindow
GraphicsPath

1.UpdateLayeredWindow

这种方式实现的不规则窗口很平滑，没有锯齿，可以带半透明的效果，但是不在响应 paint 方法，绘制不了窗体上的控件，效果图：

代码如下：

窗体代码：

public partial class UpdateLayeredWindowForm : Form
{bool haveHandle = false;//窗体句柄创建完成public UpdateLayeredWindowForm(){InitializeComponent();}private void UpdateLayeredWindowForm_Load(object sender, EventArgs e){FormBorderStyle = FormBorderStyle.None;//取消窗口边框SetBits(new Bitmap(BackgroundImage));//设置不规则窗体FormMovableEvent();//设置拖动窗体移动}#region 防止窗体闪屏private void InitializeStyles(){SetStyle(ControlStyles.UserPaint |ControlStyles.AllPaintingInWmPaint |ControlStyles.OptimizedDoubleBuffer |ControlStyles.ResizeRedraw |ControlStyles.SupportsTransparentBackColor, true);SetStyle(ControlStyles.Selectable, false);UpdateStyles();} #endregion#region 句柄创建事件protected override void OnHandleCreated(EventArgs e){InitializeStyles();//设置窗口样式、双缓冲等base.OnHandleCreated(e);haveHandle = true;} #endregion#region 设置窗体样式protected override CreateParams CreateParams{get{CreateParams cParms = base.CreateParams;cParms.ExStyle |= 0x00080000; // WS_EX_LAYEREDreturn cParms;}} #endregion#region 设置不规则窗体public void SetBits(Bitmap bitmap){if (!haveHandle) return;if (!Bitmap.IsCanonicalPixelFormat(bitmap.PixelFormat) || !Bitmap.IsAlphaPixelFormat(bitmap.PixelFormat))throw new ApplicationException("The picture must be 32bit picture with alpha channel.");IntPtr oldBits = IntPtr.Zero;IntPtr screenDC = Win32.GetDC(IntPtr.Zero);IntPtr hBitmap = IntPtr.Zero;IntPtr memDc = Win32.CreateCompatibleDC(screenDC);try{Win32.Point topLoc = new Win32.Point(Left, Top);Win32.Size bitMapSize = new Win32.Size(bitmap.Width, bitmap.Height);Win32.BLENDFUNCTION blendFunc = new Win32.BLENDFUNCTION();Win32.Point srcLoc = new Win32.Point(0, 0);hBitmap = bitmap.GetHbitmap(Color.FromArgb(0));oldBits = Win32.SelectObject(memDc, hBitmap);blendFunc.BlendOp = Win32.AC_SRC_OVER;blendFunc.SourceConstantAlpha = 255;//这里设置窗体绘制的透明度blendFunc.AlphaFormat = Win32.AC_SRC_ALPHA;blendFunc.BlendFlags = 0;Win32.UpdateLayeredWindow(Handle, screenDC, ref topLoc, ref bitMapSize, memDc, ref srcLoc, 0, ref blendFunc, Win32.ULW_ALPHA);}finally{if (hBitmap != IntPtr.Zero){Win32.SelectObject(memDc, oldBits);Win32.DeleteObject(hBitmap);}Win32.ReleaseDC(IntPtr.Zero, screenDC);Win32.DeleteDC(memDc);}} #endregion#region 无标题栏的窗口移动private Point mouseOffset; //记录鼠标指针的坐标private bool isMouseDown = false; //记录鼠标按键是否按下/// <summary>/// 窗体移动监听绑定/// </summary>private void FormMovableEvent(){//窗体移动this.MouseDown += new MouseEventHandler(Frm_MouseDown);this.MouseMove += new MouseEventHandler(Frm_MouseMove);this.MouseUp += new MouseEventHandler(Frm_MouseUp);}/// <summary>/// 窗体按下时/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void Frm_MouseDown(object sender, MouseEventArgs e){int xOffset;int yOffset;//点击窗体时，记录鼠标位置，启动移动if (e.Button == MouseButtons.Left){xOffset = -e.X;yOffset = -e.Y;mouseOffset = new Point(xOffset, yOffset);isMouseDown = true;}}/// <summary>/// 窗体移动时/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void Frm_MouseMove(object sender, MouseEventArgs e){if (isMouseDown){//移动的位置计算Point mousePos = Control.MousePosition;mousePos.Offset(mouseOffset.X, mouseOffset.Y);Location = mousePos;}}/// <summary>/// 窗体按下并释放按钮时/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void Frm_MouseUp(object sender, MouseEventArgs e){// 修改鼠标状态isMouseDown的值// 确保只有鼠标左键按下并移动时，才移动窗体if (e.Button == MouseButtons.Left){//松开鼠标时，停止移动isMouseDown = false;//Top高度小于0的时候，等于0if (this.Top < 0){this.Top = 0;}}}#endregion
}

Win32API代码：（从金鱼的例子中引用的代码）

//##########################################################################
//★★★★★★★           http://www.cnpopsoft.com           ★★★★★★★
//★★          VB & C# source code and articles for free !!!           ★★
//★★★★★★★                Davidwu                       ★★★★★★★
//##########################################################################using System;
using System.Runtime.InteropServices;/// <summary>
/// Wind32API
/// </summary>
internal class Win32
{#region 消息public const int MF_REMOVE = 0x1000;public const int SC_RESTORE = 0xF120; //还原public const int SC_MOVE = 0xF010; //移动public const int SC_SIZE = 0xF000; //大小public const int SC_MINIMIZE = 0xF020; //最小化public const int SC_MAXIMIZE = 0xF030; //最大化public const int SC_CLOSE = 0xF060; //关闭 public const int WM_SYSCOMMAND = 0x0112;public const int WM_COMMAND = 0x0111;public const int GW_HWNDFIRST = 0;public const int GW_HWNDLAST = 1;public const int GW_HWNDNEXT = 2;public const int GW_HWNDPREV = 3;public const int GW_OWNER = 4;public const int GW_CHILD = 5;public const int WM_NCCALCSIZE = 0x83;public const int WM_WINDOWPOSCHANGING = 0x46;public const int WM_PAINT = 0xF;public const int WM_CREATE = 0x1;public const int WM_NCCREATE = 0x81;public const int WM_NCPAINT = 0x85;public const int WM_PRINT = 0x317;public const int WM_DESTROY = 0x2;public const int WM_SHOWWINDOW = 0x18;public const int WM_SHARED_MENU = 0x1E2;public const int HC_ACTION = 0;public const int WH_CALLWNDPROC = 4;public const int GWL_WNDPROC = -4;public const int WS_SYSMENU = 0x80000;public const int WS_SIZEBOX = 0x40000;public const int WS_MAXIMIZEBOX = 0x10000;public const int WS_MINIMIZEBOX = 0x20000;#endregion[StructLayout(LayoutKind.Sequential)]public struct Size{public Int32 cx;public Int32 cy;public Size(Int32 x, Int32 y){cx = x;cy = y;}}[StructLayout(LayoutKind.Sequential, Pack = 1)]public struct BLENDFUNCTION{public byte BlendOp;public byte BlendFlags;public byte SourceConstantAlpha;public byte AlphaFormat;}[StructLayout(LayoutKind.Sequential)]public struct Point{public Int32 x;public Int32 y;public Point(Int32 x, Int32 y){this.x = x;this.y = y;}}public const byte AC_SRC_OVER = 0;public const Int32 ULW_ALPHA = 2;public const byte AC_SRC_ALPHA = 1;[DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]public static extern IntPtr CreateCompatibleDC(IntPtr hDC);[DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]public static extern IntPtr GetDC(IntPtr hWnd);[DllImport("gdi32.dll", ExactSpelling = true)]public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObj);[DllImport("user32.dll", ExactSpelling = true)]public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);[DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]public static extern int DeleteDC(IntPtr hDC);[DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]public static extern int DeleteObject(IntPtr hObj);[DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]public static extern int UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst, ref Point pptDst, ref Size psize, IntPtr hdcSrc, ref Point pptSrc, Int32 crKey, ref BLENDFUNCTION pblend, Int32 dwFlags);[DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]public static extern IntPtr ExtCreateRegion(IntPtr lpXform, uint nCount, IntPtr rgnData);[DllImport("user32")]public static extern int SendMessage(IntPtr hwnd, int msg, int wp, int lp);
}

2.GraphicsPath

这种方式不能实现半透明效果，有锯齿，好处是能显示出控件，贴个效果图感受下：

删除完全透明区域
只保留不透明区域

代码如下：

public partial class GraphicsPathForm : Form
{public GraphicsPathForm(){InitializeComponent();}private void GraphicsPathForm_Load(object sender, EventArgs e){TopMost = true;//设置为最顶层FormBorderStyle = FormBorderStyle.None;//取消窗口边框this.Region = new Region(GetWindowRegion(new Bitmap(BackgroundImage)));//设置不规则窗体FormMovableEvent();//设置拖动窗体移动}#region 设置不规则窗体private GraphicsPath GetWindowRegion(Bitmap bitmap){Color TempColor;GraphicsPath gp = new GraphicsPath();if (bitmap == null) return null;for (int nX = 0; nX < bitmap.Width; nX++){for (int nY = 0; nY < bitmap.Height; nY++){TempColor = bitmap.GetPixel(nX, nY);//if (TempColor.A != 0)//去掉完全透明区域if (TempColor.A == 255)//保留完全不透明的区域{gp.AddRectangle(new Rectangle(nX, nY, 1, 1));}}}return gp;} #endregion#region 无标题栏的窗口移动private Point mouseOffset; //记录鼠标指针的坐标private bool isMouseDown = false; //记录鼠标按键是否按下/// <summary>/// 窗体移动监听绑定/// </summary>private void FormMovableEvent(){//窗体移动this.MouseDown += new MouseEventHandler(Frm_MouseDown);this.MouseMove += new MouseEventHandler(Frm_MouseMove);this.MouseUp += new MouseEventHandler(Frm_MouseUp);}/// <summary>/// 窗体按下时/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void Frm_MouseDown(object sender, MouseEventArgs e){int xOffset;int yOffset;//点击窗体时，记录鼠标位置，启动移动if (e.Button == MouseButtons.Left){xOffset = -e.X;yOffset = -e.Y;mouseOffset = new Point(xOffset, yOffset);isMouseDown = true;}}/// <summary>/// 窗体移动时/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void Frm_MouseMove(object sender, MouseEventArgs e){if (isMouseDown){//移动的位置计算Point mousePos = Control.MousePosition;mousePos.Offset(mouseOffset.X, mouseOffset.Y);Location = mousePos;}}/// <summary>/// 窗体按下并释放按钮时/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void Frm_MouseUp(object sender, MouseEventArgs e){// 修改鼠标状态isMouseDown的值// 确保只有鼠标左键按下并移动时，才移动窗体if (e.Button == MouseButtons.Left){//松开鼠标时，停止移动isMouseDown = false;//Top高度小于0的时候，等于0if (this.Top < 0){this.Top = 0;}}}#endregion
}

像第一种不能添加控件的方法要想实现显示控件的话，下一个关键词就是“双层窗体”，使用两层窗体来实现一个不规则窗体的效果，大致步骤如下：

底层是皮肤层，使用第一种方法；
上层是控件层，使用第二种方法。