自定义鼠标修改窗口大小

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在windows的开发中，常常有自定义窗口外观的需要。通常都是设置WindowStyle="None"，然后在客户区模拟一个标题栏。然而在模拟标题栏的时候会发现一个问题：你已经把自定义的标题栏放在界面的最上方了，可是上边总还会有有一部分空白（如果给标题栏设置个深色背景，会很容易发现）。这是什么原因呢？因为窗口的ResizeMode并不为None，它在客户区的周围仍保留有一部分空间，使得可以通过鼠标拖拽修改窗口大小。这对于我来说是无法接受的，于是设置ResizeMode="None"，那这个时候就需要自己来完成鼠标拖拽修改窗口大小的功能。

下面是XAML文件及其界面效果：

<Window x:Class="WindowStyleNone.MainWindow"        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        Title="MainWindow" Height="350" Width="525" AllowsTransparency="True"                WindowStyle="None" Background="Transparent">    <Border Width="Auto" Height="Auto" Name="windowFrame" BorderBrush="#395984"            BorderThickness="1" CornerRadius="0,20,30,40"             MouseMove="windowFrame_MouseMove"            MouseLeftButtonUp="windowFrame_MouseLeftButtonUp"            MouseLeftButtonDown="windowFrame_MouseLeftButtonDown"            >        <Border.Background>            <SolidColorBrush Color="AliceBlue"></SolidColorBrush>        </Border.Background>        <Grid>            <Grid.RowDefinitions>                <RowDefinition Height="Auto"></RowDefinition>                <RowDefinition></RowDefinition>                <RowDefinition Height="Auto"></RowDefinition>            </Grid.RowDefinitions>            <TextBlock Text="Title Bar" Name="TitleBar" Margin="2" Padding="5"></TextBlock>            <Grid Grid.Row="1" Background="#B5CBEF">                <TextBlock VerticalAlignment="Center" HorizontalAlignment="Center"                           Foreground="White" FontSize="20" Text="Content Goes Here"></TextBlock>            </Grid>            <TextBlock Name="foot" Grid.Row="2" Text="Footer" Margin="1,10,1,1" Padding="5" HorizontalAlignment="Center"></TextBlock>        </Grid>    </Border></Window>

后台程序：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;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.Navigation;using System.Windows.Shapes;namespace WindowStyleNone{    /// <summary>    /// MainWindow.xaml 的交互逻辑    /// </summary>    public partial class MainWindow : Window    {        private Point CursorOriginPoint;                           private int Gap=4;        private bool IsMouseDown = false;        public MainWindow()        {            InitializeComponent();                   }        private void windowFrame_MouseMove(object sender, MouseEventArgs e)        {            Point pt = e.GetPosition(this);            Point spt = this.PointToScreen(pt);            if (!IsMouseDown)            {                this.Cursor = Cursors.Arrow;                if (pt.X > this.Width - this.Gap) this.Cursor = Cursors.SizeWE;                if (pt.Y > this.Height - this.Gap) this.Cursor = Cursors.SizeNS;            }            else            {                if (this.Cursor.Equals(Cursors.SizeWE))  this.Width += Point.Subtract(spt, CursorOriginPoint).X;                            if (this.Cursor.Equals(Cursors.SizeNS))  this.Height += Point.Subtract(spt, CursorOriginPoint).Y;            }                        CursorOriginPoint = spt;        }             private void windowFrame_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)        {            if (e.Source.Equals(this.TitleBar))            {                this.DragMove();            }            else            {                Border border = sender as Border;                border.CaptureMouse();                this.IsMouseDown = true;                this.CursorOriginPoint = this.PointToScreen(e.GetPosition(this));                this.foot.Text = "Down";                            }                 }        private void windowFrame_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)        {            Border border = sender as Border;            if(border.IsMouseCaptured) border.ReleaseMouseCapture();            this.IsMouseDown = false;            this.Cursor = Cursors.Arrow;            this.foot.Text = "Up";                   }    }}

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