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
现学习了两种实现方式:
1. UpdateLayeredWindow
2. GraphicsPath
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_LAYERED
return 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
///
/// 窗体移动监听绑定
///
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);
}
///
/// 窗体按下时
///
///
///
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;
}
}
///
/// 窗体移动时
///
///
///
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;
}
}
///
/// 窗体按下并释放按钮时
///
///
///
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0
if (this.Top < 0)
{
this.Top = 0;
}
}
}
#endregion
}
Win32API代码:(从金鱼的例子中引用的代码)
//##########################################################################
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//##########################################################################
using System;
using System.Runtime.InteropServices;
///
/// Wind32API
///
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);
}
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:
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
///
/// 窗体移动监听绑定
///
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);
}
///
/// 窗体按下时
///
///
///
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;
}
}
///
/// 窗体移动时
///
///
///
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;
}
}
///
/// 窗体按下并释放按钮时
///
///
///
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0
if (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。