WPF Window Resizing(WindowResizer.dll)改进
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WPF Window Resizing(CodeProject原文)
原文中的代码演示了如何动态实时改变WPF窗口的方法,不过在测试中发现一个小问题,即当鼠标按下后一直向一个方向缩小窗口的时候,当鼠标超过了另一条边的时候(在左边框按下,一直向右拖动鼠标,直到鼠标超过右边框时,异常就出现了,其他四个方向同理)会引发异常.
以下代码在原来的基础上,主要修改了updateSize函数,解决了问题.
2013-04-02：新问题，找时间修改
1，当拖动左边框的时候，右边框应固定不动，但现在右边框则在不停的闪动，虽然最后的位置是正确的。同样，上下拖动也存在相同的问题。是因为时时改变了当前窗口的左上角坐标点位置，重绘引起的闪动。
完整代码示例:
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Shapes;using System.Runtime.InteropServices;using System.Windows.Interop;using System.Threading;using System.Windows.Media.Effects;namespace DNBSoft.WPF{ public class WindowResizer { private Window target = null; private bool resizeRight = false; private bool resizeLeft = false; private bool resizeUp = false; private bool resizeDown = false; private Dictionary<UIElement, short> leftElements = new Dictionary<UIElement, short>(); private Dictionary<UIElement, short> rightElements = new Dictionary<UIElement, short>(); private Dictionary<UIElement, short> upElements = new Dictionary<UIElement, short>(); private Dictionary<UIElement, short> downElements = new Dictionary<UIElement, short>(); private PointAPI startMousePoint = new PointAPI(); //鼠标左键点下时的坐标点 private Size startWindowSize = new Size(); //鼠标左键点下时,窗口的大小 private Point startWindowLeftUpPoint = new Point(); //鼠标左键点下时,窗口左上角坐标点位置 public int minWidth = 10; public int minHeight = 10; private delegate void RefreshDelegate(); public WindowResizer(Window target) { this.target = target; if (target == null) { throw new Exception("Invalid Window handle"); } } #region add resize components private void connectMouseHandlers(UIElement element) { element.MouseLeftButtonDown += new MouseButtonEventHandler(element_MouseLeftButtonDown); element.MouseEnter += new MouseEventHandler(element_MouseEnter); element.MouseLeave += new MouseEventHandler(setArrowCursor); } public void addResizerRight(UIElement element) { connectMouseHandlers(element); rightElements.Add(element, 0); } public void addResizerLeft(UIElement element) { connectMouseHandlers(element); leftElements.Add(element, 0); } public void addResizerUp(UIElement element) { connectMouseHandlers(element); upElements.Add(element, 0); } public void addResizerDown(UIElement element) { connectMouseHandlers(element); downElements.Add(element, 0); } public void addResizerRightDown(UIElement element) { connectMouseHandlers(element); rightElements.Add(element, 0); downElements.Add(element, 0); } public void addResizerLeftDown(UIElement element) { connectMouseHandlers(element); leftElements.Add(element, 0); downElements.Add(element, 0); } public void addResizerRightUp(UIElement element) { connectMouseHandlers(element); rightElements.Add(element, 0); upElements.Add(element, 0); } public void addResizerLeftUp(UIElement element) { connectMouseHandlers(element); leftElements.Add(element, 0); upElements.Add(element, 0); } #endregion #region resize handlers private void element_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { GetCursorPos(out startMousePoint); startWindowSize = new Size(target.Width, target.Height); startWindowLeftUpPoint = new Point(target.Left, target.Top); #region updateResizeDirection UIElement sourceSender = (UIElement)sender; if (leftElements.ContainsKey(sourceSender)) { resizeLeft = true; } if (rightElements.ContainsKey(sourceSender)) { resizeRight = true; } if (upElements.ContainsKey(sourceSender)) { resizeUp = true; } if (downElements.ContainsKey(sourceSender)) { resizeDown = true; } #endregion Thread t = new Thread(new ThreadStart(updateSizeLoop)); t.Name = "Mouse Position Poll Thread"; t.Start(); } private void updateSizeLoop() { try { while (resizeDown || resizeLeft || resizeRight || resizeUp) { target.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Render, new RefreshDelegate(updateSize)); target.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Render, new RefreshDelegate(updateMouseDown)); Thread.Sleep(20); } target.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Render, new RefreshDelegate(setArrowCursor)); } catch (Exception) { } } #region updates private void updateSize() { PointAPI currentMousePoint = new PointAPI(); GetCursorPos(out currentMousePoint); try { if (resizeRight) { //如果当鼠标左键点下时,窗口的宽度已经达到最小值, if (target.Width == minWidth) { //鼠标向右移动,表示当前是将窗口变大,此时窗口只能变大,因为已经达到最小宽度了 if ((startMousePoint.X - currentMousePoint.X) < 0) { target.Width = this.startWindowSize.Width - (startMousePoint.X - currentMousePoint.X); } } else { //此时,窗口可大可小 if ((this.startWindowSize.Width - (startMousePoint.X - currentMousePoint.X)) >= minWidth) { target.Width = this.startWindowSize.Width - (startMousePoint.X - currentMousePoint.X); } else { //此时,只能限制窗口为最小值,不能继续变小 target.Width = minWidth; } } } if (resizeDown) { if (target.Height == minHeight) { if ((startMousePoint.Y - currentMousePoint.Y) < 0) { target.Height = startWindowSize.Height - (startMousePoint.Y - currentMousePoint.Y); } } else { if ((startWindowSize.Height - (startMousePoint.Y - currentMousePoint.Y)) >= minHeight) { target.Height = startWindowSize.Height - (startMousePoint.Y - currentMousePoint.Y); } else { target.Height = minHeight; } } } if (resizeLeft) { if (target.Width == minWidth) { if ((startMousePoint.X - currentMousePoint.X) > 0) { target.Width = startWindowSize.Width + (startMousePoint.X - currentMousePoint.X); target.Left = startWindowLeftUpPoint.X - (startMousePoint.X - currentMousePoint.X); } } else { if ((this.startWindowSize.Width + (startMousePoint.X - currentMousePoint.X)) >= minWidth) { target.Width = startWindowSize.Width + (startMousePoint.X - currentMousePoint.X); target.Left = startWindowLeftUpPoint.X - (startMousePoint.X - currentMousePoint.X); } else { target.Width = minWidth; target.Left = startWindowLeftUpPoint.X + startWindowSize.Width - target.Width; } } } if (resizeUp) { if (target.Height == minHeight) { if ((startMousePoint.Y - currentMousePoint.Y) > 0) { target.Height = startWindowSize.Height + (startMousePoint.Y - currentMousePoint.Y); target.Top = startWindowLeftUpPoint.Y - (startMousePoint.Y - currentMousePoint.Y); } else { target.Height = minHeight; target.Top = startWindowLeftUpPoint.Y + startWindowSize.Height - target.Height; } } else { if ((startWindowSize.Height + (startMousePoint.Y - currentMousePoint.Y)) >= minHeight) { target.Height = startWindowSize.Height + (startMousePoint.Y - currentMousePoint.Y); target.Top = startWindowLeftUpPoint.Y - (startMousePoint.Y - currentMousePoint.Y); } else { target.Height = minHeight; target.Top = startWindowLeftUpPoint.Y + startWindowSize.Height - target.Height; } } } } catch { } } private void updateMouseDown() { if (Mouse.LeftButton == MouseButtonState.Released) { resizeRight = false; resizeLeft = false; resizeUp = false; resizeDown = false; } } #endregion #endregion #region cursor updates private void element_MouseEnter(object sender, MouseEventArgs e) { bool resizeRight = false; bool resizeLeft = false; bool resizeUp = false; bool resizeDown = false; UIElement sourceSender = (UIElement)sender; if (leftElements.ContainsKey(sourceSender)) { resizeLeft = true; } if (rightElements.ContainsKey(sourceSender)) { resizeRight = true; } if (upElements.ContainsKey(sourceSender)) { resizeUp = true; } if (downElements.ContainsKey(sourceSender)) { resizeDown = true; } if ((resizeLeft && resizeDown) || (resizeRight && resizeUp)) { setNESWCursor(sender, e); } else if ((resizeRight && resizeDown) || (resizeLeft && resizeUp)) { setNWSECursor(sender, e); } else if (resizeLeft || resizeRight) { setWECursor(sender, e); } else if (resizeUp || resizeDown) { setNSCursor(sender, e); } } private void setWECursor(object sender, MouseEventArgs e) { target.Cursor = Cursors.SizeWE; } private void setNSCursor(object sender, MouseEventArgs e) { target.Cursor = Cursors.SizeNS; } private void setNESWCursor(object sender, MouseEventArgs e) { target.Cursor = Cursors.SizeNESW; } private void setNWSECursor(object sender, MouseEventArgs e) { target.Cursor = Cursors.SizeNWSE; } private void setArrowCursor(object sender, MouseEventArgs e) { if (!resizeDown && !resizeLeft && !resizeRight && !resizeUp) { target.Cursor = Cursors.Arrow; } } private void setArrowCursor() { target.Cursor = Cursors.Arrow; } #endregion #region external call [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] static extern bool GetCursorPos(out PointAPI lpPoint); private struct PointAPI { public int X; public int Y; } #endregion }}代码下载
以下代码加入了控制窗口最大化的时候不遮盖任务栏
1,加入最小宽度，最小高度的限制
2,限制最大高度不超过屏幕的工作区域，避免向下拖动时，拖动到任务栏以下的区域，被任务栏遮盖。
在窗口的构造函数中调用。
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Shapes;using System.Runtime.InteropServices;using System.Windows.Interop;using System.Threading;using System.Windows.Media.Effects;namespace DNBSoft.WPF{ public class WindowResizer { private Window target = null; private bool resizeRight = false; private bool resizeLeft = false; private bool resizeUp = false; private bool resizeDown = false; private Dictionary<UIElement, short> leftElements = new Dictionary<UIElement, short>(); private Dictionary<UIElement, short> rightElements = new Dictionary<UIElement, short>(); private Dictionary<UIElement, short> upElements = new Dictionary<UIElement, short>(); private Dictionary<UIElement, short> downElements = new Dictionary<UIElement, short>(); private PointAPI startMousePoint = new PointAPI(); //鼠标左键点下时的坐标点 private Size startWindowSize = new Size(); //鼠标左键点下时,窗口的大小 private Point startWindowLeftUpPoint = new Point(); //鼠标左键点下时,窗口左上角坐标点位置 private static int workAreaMaxHeight = -1; //工作区域最大高度 public int minWidth = 10; public int minHeight = 10; private HwndSource hs; private delegate void RefreshDelegate(); public WindowResizer(Window target) { this.target = target; if (target == null) { throw new Exception("Invalid Window handle"); } //窗口大小发生变化时，及时调整窗口最大高度和宽度，防止遮盖任务栏 this.target.SourceInitialized += new EventHandler(MyMacClass_SourceInitialized); } #region 这一部分用于最大化时不遮蔽任务栏 private void MyMacClass_SourceInitialized(object sender, EventArgs e) { hs = PresentationSource.FromVisual((Visual)sender) as HwndSource; hs.AddHook(new HwndSourceHook(WndProc)); } private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) { switch (msg) { case 0x0024:/* WM_GETMINMAXINFO */ WmGetMinMaxInfo(hwnd, lParam); handled = true; break; default: break; } return (System.IntPtr)0; } private static void WmGetMinMaxInfo(System.IntPtr hwnd, System.IntPtr lParam) { MINMAXINFO mmi = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO)); // Adjust the maximized size and position to fit the work area of the correct monitor int MONITOR_DEFAULTTONEAREST = 0x00000002; System.IntPtr monitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST); if (monitor != System.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); mmi.ptMaxPosition.y = Math.Abs(rcWorkArea.top - rcMonitorArea.top); // 这行如果不注释掉在多显示器情况下显示会有问题！ // mmi.ptMaxSize.x = Math.Abs(rcWorkArea.right - rcWorkArea.left); mmi.ptMaxSize.y = Math.Abs(rcWorkArea.bottom - rcWorkArea.top); workAreaMaxHeight = mmi.ptMaxSize.y; //当窗口的任务栏自动隐藏时，最大化的时候最下边要留几个像素的空白，否则此窗口将屏幕铺满，则鼠标移到最下边时，任务栏无法自动弹出 if (rcWorkArea.Height == rcMonitorArea.Height) { mmi.ptMaxSize.y -= 2; } } 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); /// <summary> /// POINT aka POINTAPI /// </summary> [StructLayout(LayoutKind.Sequential)] public struct POINT { /// <summary> /// x coordinate of point. /// </summary> public int x; /// <summary> /// y coordinate of point. /// </summary> public int y; /// <summary> /// Construct a point of coordinates (x,y). /// </summary> public POINT(int x, int y) { this.x = x; this.y = y; } } [StructLayout(LayoutKind.Sequential)] public struct MINMAXINFO { public POINT ptReserved; public POINT ptMaxSize; public POINT ptMaxPosition; public POINT ptMinTrackSize; public POINT ptMaxTrackSize; }; [StructLayout(LayoutKind.Sequential, Pack = 0)] public struct RECT { /// <summary> Win32 </summary> public int left; /// <summary> Win32 </summary> public int top; /// <summary> Win32 </summary> public int right; /// <summary> Win32 </summary> public int bottom; /// <summary> Win32 </summary> public static readonly RECT Empty = new RECT(); /// <summary> Win32 </summary> public int Width { get { return Math.Abs(right - left); } // Abs needed for BIDI OS } /// <summary> Win32 </summary> public int Height { get { return bottom - top; } } /// <summary> Win32 </summary> public RECT(int left, int top, int right, int bottom) { this.left = left; this.top = top; this.right = right; this.bottom = bottom; } /// <summary> Win32 </summary> public RECT(RECT rcSrc) { this.left = rcSrc.left; this.top = rcSrc.top; this.right = rcSrc.right; this.bottom = rcSrc.bottom; } } [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)] public class MONITORINFO { /// <summary> /// </summary> public int cbSize = Marshal.SizeOf(typeof(MONITORINFO)); /// <summary> /// </summary> public RECT rcMonitor = new RECT(); /// <summary> /// </summary> public RECT rcWork = new RECT(); /// <summary> /// </summary> public int dwFlags = 0; } #endregion #region add resize components private void connectMouseHandlers(UIElement element) { element.MouseLeftButtonDown += new MouseButtonEventHandler(element_MouseLeftButtonDown); element.MouseEnter += new MouseEventHandler(element_MouseEnter); element.MouseLeave += new MouseEventHandler(setArrowCursor); } public void addResizerRight(UIElement element) { connectMouseHandlers(element); rightElements.Add(element, 0); } public void addResizerLeft(UIElement element) { connectMouseHandlers(element); leftElements.Add(element, 0); } public void addResizerUp(UIElement element) { connectMouseHandlers(element); upElements.Add(element, 0); } public void addResizerDown(UIElement element) { connectMouseHandlers(element); downElements.Add(element, 0); } public void addResizerRightDown(UIElement element) { connectMouseHandlers(element); rightElements.Add(element, 0); downElements.Add(element, 0); } public void addResizerLeftDown(UIElement element) { connectMouseHandlers(element); leftElements.Add(element, 0); downElements.Add(element, 0); } public void addResizerRightUp(UIElement element) { connectMouseHandlers(element); rightElements.Add(element, 0); upElements.Add(element, 0); } public void addResizerLeftUp(UIElement element) { connectMouseHandlers(element); leftElements.Add(element, 0); upElements.Add(element, 0); } #endregion #region resize handlers private void element_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { GetCursorPos(out startMousePoint); startWindowSize = new Size(target.Width, target.Height); startWindowLeftUpPoint = new Point(target.Left, target.Top); #region updateResizeDirection UIElement sourceSender = (UIElement)sender; if (leftElements.ContainsKey(sourceSender)) { resizeLeft = true; } if (rightElements.ContainsKey(sourceSender)) { resizeRight = true; } if (upElements.ContainsKey(sourceSender)) { resizeUp = true; } if (downElements.ContainsKey(sourceSender)) { resizeDown = true; } #endregion Thread t = new Thread(new ThreadStart(updateSizeLoop)); t.Name = "Mouse Position Poll Thread"; t.Start(); } private void updateSizeLoop() { try { while (resizeDown || resizeLeft || resizeRight || resizeUp) { target.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Render, new RefreshDelegate(updateSize)); target.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Render, new RefreshDelegate(updateMouseDown)); Thread.Sleep(25); } target.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Render, new RefreshDelegate(setArrowCursor)); } catch (Exception) { } } #region updates private void updateSize() { PointAPI currentMousePoint = new PointAPI(); GetCursorPos(out currentMousePoint); try { if (resizeRight) { //如果当鼠标左键点下时,窗口的宽度已经达到最小值, if (target.Width == minWidth) { //鼠标向右移动,表示当前是将窗口变大,此时窗口只能变大,因为已经达到最小宽度了 if ((startMousePoint.X - currentMousePoint.X) < 0) { target.Width = this.startWindowSize.Width - (startMousePoint.X - currentMousePoint.X); } } else { //此时,窗口可大可小 if ((this.startWindowSize.Width - (startMousePoint.X - currentMousePoint.X)) >= minWidth) { target.Width = this.startWindowSize.Width - (startMousePoint.X - currentMousePoint.X); } else { //此时,只能限制窗口为最小值,不能继续变小 target.Width = minWidth; } } } if (resizeDown) { if (target.Height == minHeight) { if ((startMousePoint.Y - currentMousePoint.Y) < 0) { //限制窗口的最底端，不能低于任务栏，即不能被任务栏遮挡 if (workAreaMaxHeight > 0) { target.Height = (((startWindowSize.Height - (startMousePoint.Y - currentMousePoint.Y)) + target.Top) <= workAreaMaxHeight) ? (startWindowSize.Height - (startMousePoint.Y - currentMousePoint.Y)) : (workAreaMaxHeight - target.Top); } else { target.Height = startWindowSize.Height - (startMousePoint.Y - currentMousePoint.Y); } } } else { if ((startWindowSize.Height - (startMousePoint.Y - currentMousePoint.Y)) >= minHeight) { if (workAreaMaxHeight > 0) { target.Height = (((startWindowSize.Height - (startMousePoint.Y - currentMousePoint.Y)) + target.Top) <= workAreaMaxHeight) ? (startWindowSize.Height - (startMousePoint.Y - currentMousePoint.Y)) : (workAreaMaxHeight - target.Top); } else { target.Height = startWindowSize.Height - (startMousePoint.Y - currentMousePoint.Y); } } else { target.Height = minHeight; } } } if (resizeLeft) { if (target.Width == minWidth) { if ((startMousePoint.X - currentMousePoint.X) > 0) { target.Width = startWindowSize.Width + (startMousePoint.X - currentMousePoint.X); target.Left = startWindowLeftUpPoint.X - (startMousePoint.X - currentMousePoint.X); } } else { if ((this.startWindowSize.Width + (startMousePoint.X - currentMousePoint.X)) >= minWidth) { target.Width = startWindowSize.Width + (startMousePoint.X - currentMousePoint.X); target.Left = startWindowLeftUpPoint.X - (startMousePoint.X - currentMousePoint.X); } else { target.Width = minWidth; target.Left = startWindowLeftUpPoint.X + startWindowSize.Width - target.Width; } } } if (resizeUp) { if (target.Height == minHeight) { if ((startMousePoint.Y - currentMousePoint.Y) > 0) { target.Height = startWindowSize.Height + (startMousePoint.Y - currentMousePoint.Y); target.Top = startWindowLeftUpPoint.Y - (startMousePoint.Y - currentMousePoint.Y); } else { target.Height = minHeight; target.Top = startWindowLeftUpPoint.Y + startWindowSize.Height - target.Height; } } else { if ((startWindowSize.Height + (startMousePoint.Y - currentMousePoint.Y)) >= minHeight) { target.Height = startWindowSize.Height + (startMousePoint.Y - currentMousePoint.Y); target.Top = startWindowLeftUpPoint.Y - (startMousePoint.Y - currentMousePoint.Y); } else { target.Height = minHeight; target.Top = startWindowLeftUpPoint.Y + startWindowSize.Height - target.Height; } } } } catch { } } private void updateMouseDown() { if (Mouse.LeftButton == MouseButtonState.Released) { resizeRight = false; resizeLeft = false; resizeUp = false; resizeDown = false; } } #endregion #endregion #region cursor updates private void element_MouseEnter(object sender, MouseEventArgs e) { bool resizeRight = false; bool resizeLeft = false; bool resizeUp = false; bool resizeDown = false; UIElement sourceSender = (UIElement)sender; if (leftElements.ContainsKey(sourceSender)) { resizeLeft = true; } if (rightElements.ContainsKey(sourceSender)) { resizeRight = true; } if (upElements.ContainsKey(sourceSender)) { resizeUp = true; } if (downElements.ContainsKey(sourceSender)) { resizeDown = true; } if ((resizeLeft && resizeDown) || (resizeRight && resizeUp)) { setNESWCursor(sender, e); } else if ((resizeRight && resizeDown) || (resizeLeft && resizeUp)) { setNWSECursor(sender, e); } else if (resizeLeft || resizeRight) { setWECursor(sender, e); } else if (resizeUp || resizeDown) { setNSCursor(sender, e); } } private void setWECursor(object sender, MouseEventArgs e) { target.Cursor = Cursors.SizeWE; } private void setNSCursor(object sender, MouseEventArgs e) { target.Cursor = Cursors.SizeNS; } private void setNESWCursor(object sender, MouseEventArgs e) { target.Cursor = Cursors.SizeNESW; } private void setNWSECursor(object sender, MouseEventArgs e) { target.Cursor = Cursors.SizeNWSE; } private void setArrowCursor(object sender, MouseEventArgs e) { if (!resizeDown && !resizeLeft && !resizeRight && !resizeUp) { target.Cursor = Cursors.Arrow; } } private void setArrowCursor() { target.Cursor = Cursors.Arrow; } #endregion #region external call [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] static extern bool GetCursorPos(out PointAPI lpPoint); private struct PointAPI { public int X; public int Y; } #endregion }}- WPF Window Resizing(WindowResizer.dll)改进
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