wpf最大化,wpf 无边框窗口 最大化,缩放问题修复

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public class WindowBehaviorHelper { private const int WM_NCHITTEST = 0x0084; //测试消息 private const int WM_GETMINMAXINFO = 0x0024;//大小变化 private Window WindowTarget; //目标窗口 private int WidthCorner = 4; //拐角宽度 private int ThicknessTransparentBorder = 5; //透明宽度 private int ThicknessBorder = 4; //边框宽度 private Point PointMouse = new Point(); //鼠标坐标 public enum HitTest : int //测试句柄 { #region 测试句柄 HTERROR = -2, HTTRANSPARENT = -1, HTNOWHERE = 0, HTCLIENT = 1, HTCAPTION = 2, HTSYSMENU = 3, HTGROWBOX = 4, HTSIZE = HTGROWBOX, HTMENU = 5, HTHSCROLL = 6, HTVSCROLL = 7, HTMINBUTTON = 8, HTMAXBUTTON = 9, HTLEFT = 10, HTRIGHT = 11, HTTOP = 12, HTTOPLEFT = 13, HTTOPRIGHT = 14, HTBOTTOM = 15, HTBOTTOMLEFT = 16, HTBOTTOMRIGHT = 17, HTBORDER = 18, HTREDUCE = HTMINBUTTON, HTZOOM = HTMAXBUTTON, HTSIZEFIRST = HTLEFT, HTSIZELAST = HTBOTTOMRIGHT, HTOBJECT = 19, HTCLOSE = 20, HTHELP = 21 #endregion } //构造函数 public WindowBehaviorHelper(Window window) { this.WindowTarget = window; } //修复行为 public void RepairBehavior() { if (WindowTarget == null) return; this.WindowTarget.SourceInitialized += delegate { IntPtr handle = (new WindowInteropHelper(WindowTarget)).Handle; HwndSource hwndSource = HwndSource.FromHwnd(handle); if (hwndSource != null) { hwndSource.AddHook(WindowProc); } }; } //消息循环 private IntPtr WindowProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) { switch (msg) { case WM_NCHITTEST: if (WindowTarget.WindowState != WindowState.Normal) { break; } this.PointMouse.X = (lParam.ToInt32() & 0xFFFF); this.PointMouse.Y = (lParam.ToInt32() >> 16); //窗口左上角 if (this.PointMouse.X > this.WindowTarget.Left + this.ThicknessTransparentBorder && this.PointMouse.X <= this.WindowTarget.Left + this.ThicknessTransparentBorder + this.WidthCorner && this.PointMouse.Y > this.WindowTarget.Top + this.ThicknessTransparentBorder && this.PointMouse.Y <= this.WindowTarget.Top + this.ThicknessTransparentBorder + this.WidthCorner) { handled = true; return new IntPtr((int)HitTest.HTTOPLEFT); } //窗口左下角 else if (this.PointMouse.X > this.WindowTarget.Left + this.ThicknessTransparentBorder && this.PointMouse.X <= this.WindowTarget.Left + this.ThicknessTransparentBorder + this.WidthCorner && this.PointMouse.Y < this.WindowTarget.Top + this.WindowTarget.ActualHeight - this.ThicknessTransparentBorder && this.PointMouse.Y >= this.WindowTarget.Top + this.WindowTarget.ActualHeight - this.ThicknessTransparentBorder - this.WidthCorner) { handled = true; return new IntPtr((int)HitTest.HTBOTTOMLEFT); } //窗口右上角 else if (this.PointMouse.X < this.WindowTarget.Left + this.WindowTarget.ActualWidth - this.ThicknessTransparentBorder && this.PointMouse.X >= this.WindowTarget.Left + this.WindowTarget.ActualWidth - this.ThicknessTransparentBorder - this.WidthCorner && this.PointMouse.Y > this.WindowTarget.Top + this.ThicknessTransparentBorder && this.PointMouse.Y <= this.WindowTarget.Top + this.ThicknessTransparentBorder + this.WidthCorner) { handled = true; return new IntPtr((int)HitTest.HTTOPRIGHT); } //窗口右下角 else if (this.PointMouse.X < this.WindowTarget.Left + this.WindowTarget.ActualWidth - this.ThicknessTransparentBorder && this.PointMouse.X >= this.WindowTarget.Left + this.WindowTarget.ActualWidth - this.ThicknessTransparentBorder - this.WidthCorner && this.PointMouse.Y < this.WindowTarget.Top + this.WindowTarget.ActualHeight - this.ThicknessTransparentBorder && this.PointMouse.Y >= this.WindowTarget.Top + this.WindowTarget.ActualHeight - this.ThicknessTransparentBorder - this.WidthCorner) { handled = true; return new IntPtr((int)HitTest.HTBOTTOMRIGHT); } //窗口左侧 else if (this.PointMouse.X > this.WindowTarget.Left + this.ThicknessTransparentBorder && this.PointMouse.X <= this.WindowTarget.Left + this.ThicknessTransparentBorder + this.ThicknessBorder && this.PointMouse.Y > this.WindowTarget.Top + this.ThicknessTransparentBorder && this.PointMouse.Y < this.WindowTarget.Top + this.WindowTarget.ActualHeight - this.ThicknessTransparentBorder) { handled = true; return new IntPtr((int)HitTest.HTLEFT); } //窗口右侧 else if (this.PointMouse.X < this.WindowTarget.Left + this.WindowTarget.ActualWidth - this.ThicknessTransparentBorder && this.PointMouse.X >= this.WindowTarget.Left + this.WindowTarget.ActualWidth - this.ThicknessTransparentBorder - this.ThicknessBorder && this.PointMouse.Y > this.WindowTarget.Top + this.ThicknessTransparentBorder && this.PointMouse.Y < this.WindowTarget.Top + this.WindowTarget.ActualHeight - this.ThicknessTransparentBorder) { handled = true; return new IntPtr((int)HitTest.HTRIGHT); } //窗口上方 else if (this.PointMouse.X > this.WindowTarget.Left + this.ThicknessTransparentBorder && this.PointMouse.X < this.WindowTarget.Left + this.WindowTarget.ActualWidth - this.ThicknessTransparentBorder && this.PointMouse.Y > this.WindowTarget.Top + this.ThicknessTransparentBorder && this.PointMouse.Y <= this.WindowTarget.Top + this.ThicknessTransparentBorder + this.ThicknessBorder) { handled = true; return new IntPtr((int)HitTest.HTTOP); } //窗口下方 else if (this.PointMouse.X > this.WindowTarget.Left + this.ThicknessTransparentBorder && this.PointMouse.X < this.WindowTarget.Left + this.WindowTarget.ActualWidth - this.ThicknessTransparentBorder && this.PointMouse.Y < this.WindowTarget.Top + this.WindowTarget.ActualHeight - this.ThicknessTransparentBorder && this.PointMouse.Y >= this.WindowTarget.Top + this.WindowTarget.ActualHeight - this.ThicknessTransparentBorder - this.ThicknessBorder) { handled = true; return new IntPtr((int)HitTest.HTBOTTOM); } //其他消息 else { break; } case WM_GETMINMAXINFO: WmGetMinMaxInfo(hwnd, lParam); handled = true; break; default: break; } return IntPtr.Zero; } //更改最小化最大化时窗口位置大小 private void WmGetMinMaxInfo(IntPtr hwnd, IntPtr lParam) { MINMAXINFO mmi = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO)); int MONITOR_DEFAULTTONEAREST = 0x00000002; IntPtr monitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST); if (monitor != IntPtr.Zero) { MONITORINFO monitorInfo = new MONITORINFO(); GetMonitorInfo(monitor, monitorInfo); RECT rcWorkArea = monitorInfo.rcWork; RECT rcMonitorArea = monitorInfo.rcMonitor; mmi.ptMaxPosition.x = Math.Abs(rcWorkArea.left - rcMonitorArea.left) - 3; mmi.ptMaxPosition.y = Math.Abs(rcWorkArea.top - rcMonitorArea.top) - 3; mmi.ptMaxSize.x = Math.Abs(rcWorkArea.right - rcWorkArea.left) + 6; mmi.ptMaxSize.y = Math.Abs(rcWorkArea.bottom - rcWorkArea.top) + 6; mmi.ptMinTrackSize.x = (int)this.WindowTarget.MinWidth; mmi.ptMinTrackSize.y = (int)this.WindowTarget.MinHeight; } Marshal.StructureToPtr(mmi, lParam, true); } [DllImport("user32")] internal static extern bool GetMonitorInfo(IntPtr hMonitor, MONITORINFO lpmi); [DllImport("User32")] internal static extern IntPtr MonitorFromWindow(IntPtr handle, int flags); #region Nested type: MINMAXINFO [StructLayout(LayoutKind.Sequential)] internal struct MINMAXINFO { public POINT ptReserved; public POINT ptMaxSize; public POINT ptMaxPosition; public POINT ptMinTrackSize; public POINT ptMaxTrackSize; } #endregion #region Nested type: MONITORINFO [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)] internal class MONITORINFO { public int cbSize = Marshal.SizeOf(typeof(MONITORINFO)); public RECT rcMonitor; public RECT rcWork; public int dwFlags; } #endregion #region Nested type: POINT [StructLayout(LayoutKind.Sequential)] internal struct POINT { public int x; public int y; public POINT(int x, int y) { this.x = x; this.y = y; } } #endregion #region Nested type: RECT [StructLayout(LayoutKind.Sequential, Pack = 0)] internal struct RECT { public int left; public int top; public int right; public int bottom; public static readonly RECT Empty; public int Width { get { return Math.Abs(right - left); } } public int Height { get { return bottom - top; } } public RECT(int left, int top, int right, int bottom) { this.left = left; this.top = top; this.right = right; this.bottom = bottom; } public RECT(RECT rcSrc) { left = rcSrc.left; top = rcSrc.top; right = rcSrc.right; bottom = rcSrc.bottom; } public bool IsEmpty { get { return left >= right || top >= bottom; } } public override string ToString() { if (this == Empty) { return "RECT {Empty}"; } return "RECT { left : " + left + " / top : " + top + " / right : " + right + " / bottom : " + bottom + " }"; } public override bool Equals(object obj) { if (!(obj is Rect)) { return false; } return (this == (RECT)obj); } public override int GetHashCode() { return left.GetHashCode() + top.GetHashCode() + right.GetHashCode() + bottom.GetHashCode(); } public static bool operator ==(RECT rect1, RECT rect2) { return (rect1.left == rect2.left && rect1.top == rect2.top && rect1.right == rect2.right && rect1.bottom == rect2.bottom); } public static bool operator !=(RECT rect1, RECT rect2) { return !(rect1 == rect2); } } #endregion }

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