• WPF换肤之四:界面设计和代码设计分离


    说起WPF来,除了总所周知的图形处理核心的变化外,和Winform比起来,还有一个巨大的变革,那就是真正意义上做到了界面设计和代码设计的分离。这样可以让美工和程序分开进行,而不是糅合在一块,这样做的好处当然也是显而易见的:提高了开发效率。

    原先的设计方式

    在我们之前设计的代码中,每当添加一个新的窗体的时候,我总是会在这个新的窗体的XAML文件中加入如下的代码,以便使样式能够应用上去:

    View Code
    <Window x:Class="WpfApplication1.MsgWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="TestWindow" Height="391" Width="418" WindowStyle="None" AllowsTransparency="True" Background="Transparent" OpacityMask="White" ResizeMode="NoResize" PreviewMouseMove="ResetCursor" WindowStartupLocation="CenterScreen">
        <Grid Background="Transparent">
                <Border BorderThickness="5" BorderBrush="DarkGreen"  CornerRadius="10,10,10,10" MouseMove="DisplayResizeCursor" PreviewMouseDown="Resize" Name="top">
                <Border.Background>
                    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                        <GradientStop Color="#eee"/>
                    </LinearGradientBrush>
                </Border.Background>
                <Grid>
                   <!--这里放置UIElement.-->
                </Grid>
                </Border>
        </Grid>
    </Window>

    然后,在后台中,为了使窗体能够在最大化时不遮蔽任务栏,拖拉窗体边缘能够改变窗口大小,点按窗体可以实现拖拉的时候,在后台加入了如下的代码:

    View Code
    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.Windows.Interop;
    using System.Diagnostics;
    using System.Runtime.InteropServices;
    
    namespace WpfApplication1
    {
        /// <summary>
        /// Interaction logic for TestWindow.xaml
        /// </summary>
        public partial class MsgWindow : Window
        {
            private const int WM_SYSCOMMAND = 0x112;
            private HwndSource hs;
            IntPtr retInt = IntPtr.Zero;
    
            public MsgWindow()
            {
                InitializeComponent();
                this.SourceInitialized += new EventHandler(WSInitialized);
            }
    
            void WSInitialized(object sender, EventArgs e)
            {
                hs = PresentationSource.FromVisual(this) as HwndSource;
                hs.AddHook(new HwndSourceHook(WndProc));
            }
    
           public double relativeClip = 10;
    
            public enum ResizeDirection
            {
                Left = 1,
                Right = 2,
                Top = 3,
                TopLeft = 4,
                TopRight = 5,
                Bottom = 6,
                BottomLeft = 7,
                BottomRight = 8,
            }
    
            [DllImport("user32.dll", CharSet = CharSet.Auto)]
            private static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
    
            private void ResizeWindow(ResizeDirection direction)
            {
                SendMessage(hs.Handle, WM_SYSCOMMAND, (IntPtr)(61440 + direction), IntPtr.Zero);
            }
    
            private void ResetCursor(object sender, MouseEventArgs e)
            {
                if (Mouse.LeftButton != MouseButtonState.Pressed)
                {
                    this.Cursor = Cursors.Arrow;
                }
            }
    
            private void Resize(object sender, MouseButtonEventArgs e)
            {
                Border clickedBorder = sender as Border;
    
                Point pos = Mouse.GetPosition(this);
                double x = pos.X;
                double y = pos.Y;
                double w = this.ActualWidth;
                double h = this.ActualHeight;
    
                if (x <= relativeClip & y <= relativeClip) // left top
                {
                    this.Cursor = Cursors.SizeNWSE;
                    ResizeWindow(ResizeDirection.TopLeft);
                }
                if (x >= w - relativeClip & y <= relativeClip) //right top
                {
                    this.Cursor = Cursors.SizeNESW;
                    ResizeWindow(ResizeDirection.TopRight);
                }
    
                if (x >= w - relativeClip & y >= h - relativeClip) //bottom right
                {
                    this.Cursor = Cursors.SizeNWSE;
                    ResizeWindow(ResizeDirection.BottomRight);
                }
    
                if (x <= relativeClip & y >= h - relativeClip)  // bottom left
                {
                    this.Cursor = Cursors.SizeNESW;
                    ResizeWindow(ResizeDirection.BottomLeft);
                }
    
                if ((x >= relativeClip & x <= w - relativeClip) & y <= relativeClip) //top
                {
                    this.Cursor = Cursors.SizeNS;
                    ResizeWindow(ResizeDirection.Top);
                }
    
                if (x >= w - relativeClip & (y >= relativeClip & y <= h - relativeClip)) //right
                {
                    this.Cursor = Cursors.SizeWE;
                    ResizeWindow(ResizeDirection.Right);
                }
    
                if ((x >= relativeClip & x <= w - relativeClip) & y > h - relativeClip) //bottom
                {
                    this.Cursor = Cursors.SizeNS;
                    ResizeWindow(ResizeDirection.Bottom);
                }
    
                if (x <= relativeClip & (y <= h - relativeClip & y >= relativeClip)) //left
                {
                    this.Cursor = Cursors.SizeWE;
                    ResizeWindow(ResizeDirection.Left);
                }
            }
    
            private void DisplayResizeCursor(object sender, MouseEventArgs e)
            {
                Border clickBorder = sender as Border;
    
                Point pos = Mouse.GetPosition(this);
                double x = pos.X;
                double y = pos.Y;
                double w= this.ActualWidth;
                double h= this.ActualHeight;
    
                this.label1.Content = x + "--" + y;
    
                if (x <= relativeClip & y <= relativeClip) // left top
                {
                    this.Cursor = Cursors.SizeNWSE;
                }
                if (x >= w - relativeClip & y <= relativeClip) //right top
                {
                    this.Cursor = Cursors.SizeNESW;
                }
    
                if (x >= w - relativeClip & y >= h - relativeClip) //bottom right
                {
                    this.Cursor = Cursors.SizeNWSE;
                }
    
                if (x <= relativeClip & y >= h - relativeClip)  // bottom left
                {
                    this.Cursor = Cursors.SizeNESW;
                }
    
                if ((x >= relativeClip & x <= w - relativeClip) & y <= relativeClip) //top
                {
                    this.Cursor = Cursors.SizeNS;
                }
    
                if (x >= w - relativeClip & (y >= relativeClip & y <= h - relativeClip)) //right
                {
                    this.Cursor = Cursors.SizeWE;
                }
    
                if ((x >= relativeClip & x <= w - relativeClip) & y > h - relativeClip) //bottom
                {
                    this.Cursor = Cursors.SizeNS;
                }
    
                if (x <= relativeClip & (y <= h - relativeClip & y >= relativeClip)) //left
                {
                    this.Cursor = Cursors.SizeWE;
                }
            }
    
            private void button1_Click(object sender, RoutedEventArgs e)
            {
                this.WindowState = (this.WindowState == WindowState.Normal ? WindowState.Maximized : WindowState.Normal);
            }
            #region 这一部分用于最大化时不遮蔽任务栏
            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);
                    mmi.ptMaxSize.x = Math.Abs(rcWorkArea.right - rcWorkArea.left);
                    mmi.ptMaxSize.y = Math.Abs(rcWorkArea.bottom - rcWorkArea.top);
                }
    
                Marshal.StructureToPtr(mmi, lParam, true);
            }
    
            /// <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;
                }
            }
    
            /// <summary>
            /// 窗体大小信息
            /// </summary>
            [StructLayout(LayoutKind.Sequential)]
            public struct MINMAXINFO
            {
                public POINT ptReserved;
                public POINT ptMaxSize;
                public POINT ptMaxPosition;
                public POINT ptMinTrackSize;
                public POINT ptMaxTrackSize;
            };
            /// <summary> Win32 </summary>
            [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;
                }
    
                /// <summary> Win32 </summary>
                public bool IsEmpty
                {
                    get
                    {
                        // BUGBUG : On Bidi OS (hebrew arabic) left > right
                        return left >= right || top >= bottom;
                    }
                }
                /// <summary> Return a user friendly representation of this struct </summary>
                public override string ToString()
                {
                    if (this == RECT.Empty) { return "RECT {Empty}"; }
                    return "RECT { left : " + left + " / top : " + top + " / right : " + right + " / bottom : " + bottom + " }";
                }
    
                /// <summary> Determine if 2 RECT are equal (deep compare) </summary>
                public override bool Equals(object obj)
                {
                    if (!(obj is Rect)) { return false; }
                    return (this == (RECT)obj);
                }
    
                /// <summary>Return the HashCode for this struct (not garanteed to be unique)</summary>
                public override int GetHashCode()
                {
                    return left.GetHashCode() + top.GetHashCode() + right.GetHashCode() + bottom.GetHashCode();
                }
    
    
                /// <summary> Determine if 2 RECT are equal (deep compare)</summary>
                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);
                }
    
                /// <summary> Determine if 2 RECT are different(deep compare)</summary>
                public static bool operator !=(RECT rect1, RECT rect2)
                {
                    return !(rect1 == rect2);
                }
            }
    
            [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;
            }
    
            [DllImport("user32")]
            internal static extern bool GetMonitorInfo(IntPtr hMonitor, MONITORINFO lpmi);
    
            [DllImport("User32")]
            internal static extern IntPtr MonitorFromWindow(IntPtr handle, int flags);
            #endregion
    
            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;
            }
    
        }
    }

    如果按照上面的设计,那么每加入一个新的窗体,都要重复上面的两个步骤的话,加入一个工程中需要加入的新窗体特别多,估计这种操作足以让一个正常人疯掉了。并且假如以后border的颜色要修改,那得修改多少页面啊~~~

    改进的设计方式

    所以,为了便于设计和维护,实现所谓的UI和代码分析,让我们提出一个假设的方案来:

    首先,所有的公共样式放到一个样式文件中,所有新加的窗体都能共享这个公共的样式文件。

    其次,所有的公共事件(窗体最大化,最小化,关闭等),都放到一个公共的基类中,所有新加的窗体只要继承该基类,即可继承系统公用的事件操作。

    那么,本着这个假设,我们开始来进行。

    首先,对于公共样式,我们需要添加一个“资源词典”的页面,用来设计公共样式:

    添加完成后,会看到如下XAML:

    View Code
    <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    
    </ResourceDictionary>

    下面我们在这个文件中添加样式:

    View Code
    <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    
                        x:Class="MyOwnerDrawnWindow.Resource_Dictionaries.MyTheme"
    
                        >
    
     
    
        <!-- Border defining the frame of the Window -->
    
    
        <Style x:Key="MywindowBorder" TargetType="Border">
    
            <Setter Property="CornerRadius" Value="10, 10, 10, 10" />
    
            <Setter Property="BorderBrush" Value="DarkGreen"></Setter>
    
            <Setter Property="BorderThickness" Value="5" />
    
            <Setter Property="HorizontalAlignment" Value="Stretch"></Setter>
    
            <Setter Property="VerticalAlignment" Value="Stretch"></Setter>
    
            <Setter Property="Background" Value="#ababab"></Setter>
    
        </Style>
    
     
    
        <ControlTemplate x:Key="MyWindowTemplate" TargetType="{x:Type Window}">
    
            <Grid>
    
                <Border x:Name="MyBorder"  Style="{StaticResource MywindowBorder}" >
    
                    <Border.Background>
    
                        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
    
                            <GradientStop Color="#eee"/>
    
                        </LinearGradientBrush>
    
                    </Border.Background>
    
                    <!--这一句很重要,主要用于放置界面元素,和asp.net中的masterpage有点像-->
    
                     <AdornerDecorator>
    
                        <ContentPresenter />
    
                    </AdornerDecorator>
    
                </Border>
    
            </Grid>
    
        </ControlTemplate>
    
     
    
        <!-- My Window Style -->
    
        <Style x:Key="MyWindowStyle" TargetType="Window">
    
            <Setter Property="Background" Value="Transparent" />
    
            <Setter Property="WindowStyle" Value="None" />
    
            <Setter Property="AllowsTransparency" Value="True" />
    
            <Setter Property="Template" Value="{StaticResource MyWindowTemplate}" />
    
        </Style>
    
    </ResourceDictionary>

    好了,这就是我们的样式文件,接下来我们需要处理这个样式中的Border事件,让其支持鼠标左键拖拉功能。

    新建一个类,命名为MyThemeClass.cs,让其继承自Window基类。在MyThemeClass类中,我们主要处理两个内容,一个是支持鼠标左键拖拉以便改变窗体大小,另一个是使窗体不遮蔽任务栏。

    具体代码如下:

    View Code
    using System;
    
    using System.Collections.Generic;
    
    using System.Linq;
    
    using System.Text;
    
    using System.Windows;
    
    using System.Windows.Media;
    
    using System.Windows.Interop;
    
    using System.Runtime.InteropServices;
    
    using System.Windows.Controls;
    
    using System.Windows.Input;
    
     
    
    namespace MyOwnerDrawnWindow
    
    {
    
        public class MyThemeClass:Window
    
        {
    
             private const int WM_SYSCOMMAND = 0x112;
    
            public const int WM_LBUTTONUP = 0x0202;
    
            private HwndSource hs;
    
            IntPtr retInt = IntPtr.Zero;
    
            public double relativeClip = 10;
    
     
    
            public MyThemeClass()
    
            {
    
                this.Loaded += delegate
    
                {
    
                    InitializeEvent();
    
                };
    
                this.SourceInitialized +=new EventHandler(MyMacClass_SourceInitialized);
    
            }
    
     
    
            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;
    
            }
    
     
    
            #region 这一部分用于最大化时不遮蔽任务栏
    
            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);
    
                    mmi.ptMaxSize.x = Math.Abs(rcWorkArea.right - rcWorkArea.left);
    
                    mmi.ptMaxSize.y = Math.Abs(rcWorkArea.bottom - rcWorkArea.top);
    
                }
    
     
    
                Marshal.StructureToPtr(mmi, lParam, true);
    
            }
    
     
    
            /// <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;
    
            }
    
     
    
            [DllImport("user32")]
    
            internal static extern bool GetMonitorInfo(IntPtr hMonitor, MONITORINFO lpmi);
    
     
    
            [DllImport("User32")]
    
            internal static extern IntPtr MonitorFromWindow(IntPtr handle, int flags);
    
            #endregion
    
     
    
            #region 这一部分是四个边加上四个角
    
            public enum ResizeDirection
    
            {
    
                Left = 1,
    
                Right = 2,
    
                Top = 3,
    
                TopLeft = 4,
    
                TopRight = 5,
    
                Bottom = 6,
    
                BottomLeft = 7,
    
                BottomRight = 8,
    
            }
    
            #endregion
    
     
    
            #region 用于改变窗体大小
    
            [DllImport("user32.dll", CharSet = CharSet.Auto)]
    
            private static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
    
     
    
            private void ResizeWindow(ResizeDirection direction)
    
            {
    
                SendMessage(hs.Handle, WM_SYSCOMMAND, (IntPtr)(61440 + direction), IntPtr.Zero);
    
            }
    
            #endregion
    
     
    
            #region 为元素注册事件
    
            private void InitializeEvent()
    
            {
    
                ControlTemplate baseWindowTemplate = (ControlTemplate)App.Current.Resources["MyWindowTemplate"];
    
                Border borderClip = (Border)baseWindowTemplate.FindName("MyBorder", this);
    
     
    
                borderClip.MouseMove += delegate
    
                {
    
                    DisplayResizeCursor(null,null);
    
                };
    
     
    
                borderClip.PreviewMouseDown += delegate
    
                {
    
                    Resize(null,null);
    
                };
    
     
    
                borderClip.MouseLeftButtonDown += delegate
    
                {
    
                    DragMove();
    
                };
    
     
    
                this.PreviewMouseMove += delegate
    
                {
    
                    ResetCursor(null,null);
    
                };
    
            }
    
            #endregion
    
     
    
            #region 重写的DragMove,以便解决利用系统自带的DragMove出现Exception的情况
    
            public new void DragMove()
    
            {
    
                if (this.WindowState == WindowState.Normal)
    
                {
    
                    SendMessage(hs.Handle, WM_SYSCOMMAND, (IntPtr)0xf012, IntPtr.Zero);
    
                    SendMessage(hs.Handle, WM_LBUTTONUP, IntPtr.Zero, IntPtr.Zero);
    
                }
    
            }
    
            #endregion
    
     
    
            #region 显示拖拉鼠标形状
    
            private void DisplayResizeCursor(object sender, MouseEventArgs e)
    
            {
    
                Point pos = Mouse.GetPosition(this);
    
                double x = pos.X;
    
                double y = pos.Y;
    
                double w = this.ActualWidth;  //注意这个地方使用ActualWidth,才能够实时显示宽度变化
    
                double h = this.ActualHeight;
    
     
    
                if (x <= relativeClip & y <= relativeClip) // left top
    
                {
    
                    this.Cursor = Cursors.SizeNWSE;
    
                }
    
                if (x >= w - relativeClip & y <= relativeClip) //right top
    
                {
    
                    this.Cursor = Cursors.SizeNESW;
    
                }
    
     
    
                if (x >= w - relativeClip & y >= h - relativeClip) //bottom right
    
                {
    
                    this.Cursor = Cursors.SizeNWSE;
    
                }
    
     
    
                if (x <= relativeClip & y >= h - relativeClip)  // bottom left
    
                {
    
                    this.Cursor = Cursors.SizeNESW;
    
                }
    
     
    
                if ((x >= relativeClip & x <= w - relativeClip) & y <= relativeClip) //top
    
                {
    
                    this.Cursor = Cursors.SizeNS;
    
                }
    
     
    
                if (x >= w - relativeClip & (y >= relativeClip & y <= h - relativeClip)) //right
    
                {
    
                    this.Cursor = Cursors.SizeWE;
    
                }
    
     
    
                if ((x >= relativeClip & x <= w - relativeClip) & y > h - relativeClip) //bottom
    
                {
    
                    this.Cursor = Cursors.SizeNS;
    
                }
    
     
    
                if (x <= relativeClip & (y <= h - relativeClip & y >= relativeClip)) //left
    
                {
    
                    this.Cursor = Cursors.SizeWE;
    
                }
    
            }
    
            #endregion
    
     
    
            #region  还原鼠标形状
    
            private void ResetCursor(object sender, MouseEventArgs e)
    
            {
    
                if (Mouse.LeftButton != MouseButtonState.Pressed)
    
                {
    
                    this.Cursor = Cursors.Arrow;
    
                }
    
            }
    
            #endregion
    
     
    
            #region 判断区域,改变窗体大小
    
            private void Resize(object sender, MouseButtonEventArgs e)
    
            {
    
                Point pos = Mouse.GetPosition(this);
    
                double x = pos.X;
    
                double y = pos.Y;
    
                double w = this.ActualWidth;
    
                double h = this.ActualHeight;
    
     
    
                if (x <= relativeClip & y <= relativeClip) // left top
    
                {
    
                    this.Cursor = Cursors.SizeNWSE;
    
                    ResizeWindow(ResizeDirection.TopLeft);
    
                }
    
                if (x >= w - relativeClip & y <= relativeClip) //right top
    
                {
    
                    this.Cursor = Cursors.SizeNESW;
    
                    ResizeWindow(ResizeDirection.TopRight);
    
                }
    
     
    
                if (x >= w - relativeClip & y >= h - relativeClip) //bottom right
    
                {
    
                    this.Cursor = Cursors.SizeNWSE;
    
                    ResizeWindow(ResizeDirection.BottomRight);
    
                }
    
     
    
                if (x <= relativeClip & y >= h - relativeClip)  // bottom left
    
                {
    
                    this.Cursor = Cursors.SizeNESW;
    
                    ResizeWindow(ResizeDirection.BottomLeft);
    
                }
    
     
    
                if ((x >= relativeClip & x <= w - relativeClip) & y <= relativeClip) //top
    
                {
    
                    this.Cursor = Cursors.SizeNS;
    
                    ResizeWindow(ResizeDirection.Top);
    
                }
    
     
    
                if (x >= w - relativeClip & (y >= relativeClip & y <= h - relativeClip)) //right
    
                {
    
                    this.Cursor = Cursors.SizeWE;
    
                    ResizeWindow(ResizeDirection.Right);
    
                }
    
     
    
                if ((x >= relativeClip & x <= w - relativeClip) & y > h - relativeClip) //bottom
    
                {
    
                    this.Cursor = Cursors.SizeNS;
    
                    ResizeWindow(ResizeDirection.Bottom);
    
                }
    
     
    
                if (x <= relativeClip & (y <= h - relativeClip & y >= relativeClip)) //left
    
                {
    
                    this.Cursor = Cursors.SizeWE;
    
                    ResizeWindow(ResizeDirection.Left);
    
                }
    
            }
    
    
            #endregion
    
        }
    
    }

    这样,我们的Theme和类就创建好了,那么,在主窗体中,我们该如何应用上去呢?当然,这个不是难事,并且异常简单:

    首先,创建一个新的窗体Window1, 它需要继承自MyThemeClass类:

    public partial class Window1 : MyThemeClass

    然后再XAML中只需要修改两个地方,首先是添加入一个新的引用:

    xmlns:src="clr-namespace:MyOwnerDrawnWindow"

    添加完这个引用后,把<Window….></Window>修改成<src:MyThemeClass……></ MyThemeClass> 这样做的目的是防止由于继承基类的不同而造成XAML的识别错误。

    最后,只需要添加这句Style="{StaticResource MyWindowStyle}"  就行了。 这样就算是添加完成了新的窗体,每一个新添加的窗体都按照这种方式添加即可,是不是简洁了许多? 并且后期维护也简单多了。

    View Code
    <src:MyThemeClass x:Class="MyOwnerDrawnWindow.Window1"
    
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    
        xmlns:src="clr-namespace:MyOwnerDrawnWindow"
    
        Title="Window1" Height="335" Width="706"
    
        Style="{StaticResource MyWindowStyle}">
    
        <Grid>
    
           <!--这里放置你的UIElement-->
    
        </Grid>
    
    </src:MyThemeClass>

    好了,最后一步就是讲Theme文件关联起来,在APP.xaml文件中添加对资源文件的引用即可:

    View Code
    <Application x:Class="MyOwnerDrawnWindow.App"
    
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    
        StartupUri="Window1.xaml">
    
       <Application.Resources>
    
            <ResourceDictionary>
    
                <ResourceDictionary.MergedDictionaries>
    
                    <ResourceDictionary Source="MyTheme.xaml"></ResourceDictionary>
    
                </ResourceDictionary.MergedDictionaries>
    
            </ResourceDictionary>
    
        </Application.Resources>
    
    </Application>

    这样运行起来以后,达到的预期的效果。

    源码下载

    源码下载

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  • 原文地址:https://www.cnblogs.com/scy251147/p/2613632.html
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