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C# wpf实现任意控件更多调整大小功能

作者：CodeOfCC

这篇文章主要为大家详细介绍了C# wpf实现任意控件更多调整大小功能的相关知识,文中的示例代码讲解详细,感兴趣的小伙伴可以跟随小编一起学习一下

前言

上一章我们已经实现了任意控件统一的拖动调整功能，能够方便的给任意控件设置拖动调整大小。开发过程中发现还是有些功能可以继续拓展的，比如cs代码触发拖动、自定义模板、交叉拖动、限制拖动范围等功能。有功能实现起来不算太容易，却很有实用价值。

一、添加的功能

在第四章基础上添加了如下功能。

1、任意控件DragResize

我们知道wpf的Window有DragMove功能，在鼠标左键按下事件中调用此方法就能实现拖动功能很方便。对于调整大小也可以实现类似的DragResize功能， 实际效果和点击画板拖出一个形状差不多。

代码示例如下：

 /// <summary>
 /// 手动触发拖动改变大小，与Window.DragMove类似,只能在鼠标左键按下时调用。
 /// 实际效果和点击画板拖出一个形状差不多。
 /// 此方法为拓展方法，FrameworkElement的子类控件（即有宽高属性的控件）都可以调用此方法。
 /// </summary>
 /// <param name="elememt"></param>
 /// <returns>返回Task，await等待拖动完成</returns>
 /// <exception cref="InvalidOperationException"></exception>
 public static async Task DragResize(this FrameworkElement elememt)
 {
     if (Mouse.LeftButton != MouseButtonState.Pressed)
     {
         throw new InvalidOperationException("Left button down to call this method");
     }
     if (elememt.Parent == null && elememt is not Window)
     {
         throw new InvalidOperationException("Element should be on the visual tree");
     }
     //生成Resizeable对象，第四章完整代码中。
     //获取右下角Thumb
     //手动触发Thumb拖动事件
     //等待拖动完成
 }

2、边界限制

添加一个IsResizeInBounds附加属性，表示拖动范围是否在父控件内。

代码示例如下：

public static bool GetIsResizeInBounds(DependencyObject obj)
{
    return (bool)obj.GetValue(IsResizeInBoundsProperty);
}

public static void SetIsResizeInBounds(DependencyObject obj, bool value)
{
    obj.SetValue(IsResizeInBoundsProperty, value);
}

/// <summary>
/// 是否在父控件范围内拖动
/// </summary>
public static readonly DependencyProperty IsResizeInBoundsProperty =
    DependencyProperty.RegisterAttached("IsResizeInBounds", typeof(bool), typeof(Resize), new PropertyMetadata(false));

第四章的拖动逻辑中添加相应的限制功能，本质上就是判断如果超出边界则控件刚好依附在边界上，代码如下:

 var dx = left - margin.Left;
 var dy = top - margin.Top;
 if (GetIsResizeInBounds(c))
 {
     var pos = c.GetPosition();
     var parent = _resizeTarget.Parent as FrameworkElement;
     Size size;
     if (parent == null)
     {
         size.Width = SystemParameters.PrimaryScreenWidth;
         size.Height = SystemParameters.PrimaryScreenHeight;
     }
     else
     {
         size.Width = parent.ActualWidth;
         size.Height = parent.ActualHeight;
     }

​​​​​​​     if (pos.X + dx < 0)
     {
         left = -pos.X + margin.Left;
         width = pos.X + c.ActualWidth;
     }
     else if (pos.X + dx + width > size.Width)
     {
         width = size.Width - pos.X;
         right = margin.Right + c.ActualWidth - width;
     }
     if (pos.Y + dy < 0)
     {
         top = -pos.Y + margin.Top;
         height = pos.Y + c.ActualHeight;
     }
     else if (pos.Y + dy + height > size.Height)
     {
         height = size.Height - pos.Y;
         bottom = margin.Bottom + c.ActualHeight - height;
     }
 }

3、交叉拖动

交叉拖动是曾经用gdi画图时会出现的一种情况，gdi绘制的宽高可以为负数，所以可以直接穿过起点反向拖动也能绘制出图形。在wpf中的控件是不支持宽高负数的，所以我们需要用其他方式实现。

下列步骤以横向为例：

（1）判断控件边界

 if (width < 0）

（2）固定到控件边界

SetTargetMargin为前3章的集合，根据不同控件类型比如Window是设置Left、Top、Grid则设置Margin等。minWidth是控件的MinWidth属性。margin参考第四张完整代码。

if (thumb.HorizontalAlignment == HorizontalAlignment.Left)
//左拖动点
{
    SetTargetMargin(new Thickness(margin.Left + c.Width - minWidth, margin.Top, margin.Right - c.Width + minWidth, margin.Bottom));
}
else
//右拖动点
{
    SetTargetMargin(new Thickness(margin.Left - c.Width + minWidth, margin.Top, margin.Right + c.Width - minWidth, margin.Bottom));
}

（3）事件转移

//当前拖动点触发鼠标弹起事件
MouseButtonEventArgs upEvent = new MouseButtonEventArgs(Mouse.PrimaryDevice, Environment.TickCount, MouseButton.Left)
{ RoutedEvent = UIElement.MouseLeftButtonUpEvent };
thumb.RaiseEvent(upEvent);
//反向拖动点触发鼠标按下事件
MouseButtonEventArgs downEvent = new MouseButtonEventArgs(Mouse.PrimaryDevice, Environment.TickCount, MouseButton.Left)
{ RoutedEvent = UIElement.MouseLeftButtonDownEvent };
t.RaiseEvent(downEvent);

4、拖动点模板

添加附加属性ThumbsTemplate

public static ControlTemplate GetThumbsTemplate(DependencyObject obj)
{
    return (ControlTemplate)obj.GetValue(ThumbsTemplateProperty);
}

public static void SetThumbsTemplate(DependencyObject obj, ControlTemplate value)
{
    obj.SetValue(ThumbsTemplateProperty, value);
}

/// <summary>
/// 拖动点的模板
/// </summary>
public static readonly DependencyProperty ThumbsTemplateProperty =
    DependencyProperty.RegisterAttached("ThumbsTemplate", typeof(ControlTemplate), typeof(Resize), new PropertyMetadata(null));

生成拖动点时会应用模板

var thumbsTemplate = GetThumbsTemplate(_resizeTarget);
thumb.Template = thumbsTemplate;

5、拖动点容器模板

拖动点的容器模板，主要用于设置margin调整拖动点的整体位置，添加附加属性ThumbsPanel。

 public static ItemsPanelTemplate GetThumbsPanel(DependencyObject obj)
 {
     return (ItemsPanelTemplate)obj.GetValue(ThumbsPanelProperty);
 }

 public static void SetThumbsPanel(DependencyObject obj, ItemsPanelTemplate value)
 {
     obj.SetValue(ThumbsPanelProperty, value);
 }

 /// <summary>
 /// 拖动点的容器，主要用于设置margin
 /// </summary>
 public static readonly DependencyProperty ThumbsPanelProperty =
     DependencyProperty.RegisterAttached("ThumbsPanel", typeof(ItemsPanelTemplate), typeof(Resize), new PropertyMetadata(null));

生成拖动点布局时会应用模板

var itemsPanel = GetThumbsPanel(_resizeTarget);
_defalutPanel.ItemsPanel = itemsPanel;

6、整体模板

拖动点模板和拖动点布局模板已经很大程度灵活了使用，如果需要更高的定制性，直接使用整体模板，整体模板赋值后拖动点模板和拖动点布局模板会失效。此功能与第四章的ResizeTemplate相同但名称改为Template。基本规则是第一级控件为容器、第二级控件为Thumb类型自动识别为拖动点，拖动方向由HorizontalAlignment和VerticalAlignment决定。

7、窗口平滑拖动

之所有要对窗口拖动平滑处理是因为，自定义的调整大小只能设置Window的Left、Top、Width、Height，当窗口进行左或上拖动时右或下会出现残影，这种情况通过SetWindowPos和MoveWindow也无法改善。在不使用窗口自带的拖动功能的情况下，目前笔者研究出的方法就是使用透明窗口全屏，控件模拟窗口进行拖动。当然这种实现的限制就是一定要透明窗口，

AllowTransparency为true或者WindowChrome的GlassFrameThickness为-1。

因为这种实现还不是很完美对装饰器不兼容，所以提供IsWindowDragSmooth属性，可以打开和关闭功能。

public static bool GetIsWindowDragSmooth(DependencyObject obj)
{
    return (bool)obj.GetValue(IsWindowDragSmoothProperty);
}

​​​​​​​public static void SetIsWindowDragSmooth(DependencyObject obj, bool value)
{
    obj.SetValue(IsWindowDragSmoothProperty, value);
}

/// <summary>
/// 拖拽窗口调整大小是否平滑处理，作用是避免拖拽窗口左上时右下闪烁。
/// 此属性只对窗口有效
/// 此属性为true时需要透明窗口才能生效，即AllowTransparency为true或者WindowChrome的GlassFrameThickness为-1。
/// 当前版本不兼容有装饰器的窗口，拖动中装饰器可能会显示在窗口外面。
/// </summary>
// Using a DependencyProperty as the backing store for IsWindowDragSmooth.  This enables animation, styling, binding, etc...
public static readonly DependencyProperty IsWindowDragSmoothProperty =
    DependencyProperty.RegisterAttached("IsWindowDragSmooth", typeof(bool), typeof(Resize), new PropertyMetadata(false));

8、拖动事件

提供3个拖动事件，拖动开始、拖动变化、拖动结束。

代码示例如下：

/// <summary>
///  拖动开始事件
/// </summary>
public static readonly RoutedEvent DragResizeStartedEvent = EventManager.RegisterRoutedEvent("DragResizeStarted", RoutingStrategy.Direct, typeof(EventHandler<DragResizeStartedEventArgs>), typeof(Resize));
/// <summary>
/// 拖动变化事件
/// </summary>
public static readonly RoutedEvent DragResizeDeltaEvent = EventManager.RegisterRoutedEvent("DragResizeDelta", RoutingStrategy.Direct, typeof(EventHandler<DragResizeDeltaEventArgs>), typeof(Resize));
/// <summary>
/// 拖动结束事件
/// </summary>
public static readonly RoutedEvent DragResizeCompletedEvent = EventManager.RegisterRoutedEvent("DragResizeCompleted", RoutingStrategy.Direct, typeof(EventHandler<DragResizeCompletedEventArgs>), typeof(Resize));

9、其他功能

（1）适应MinWidth、MinHeight

在第四章完整带的基础上将边界判断修改为控件的MinWidth、MinHeight即可。

横向

if (width >= minWidth/*原本是0*/)
{
    //略
}

纵向与横向逻辑一致，修改对应变量即可，略

（2）适应MaxWidth、MaxHeight

超过了最大值需要进行修正示例如下

横向：

if (width > c.MaxWidth)
{
    if (thumb.HorizontalAlignment == HorizontalAlignment.Left)
    {
        left += width - c.MaxWidth;
        right = margin.Right;
    }
    else
    {
        left = margin.Left;
        right += width - c.MaxWidth;
    }
    width = c.MaxWidth;
}

纵向与横向逻辑一致，修改对应变量即可，略。

（3）适配任意dpi

所有改变坐标以及大小的代码已经适配了任意dpi。

主要注意的就是PointToScreen得到的坐标需要dpi转换。

下列是获取dpi的方法。

static Point GetDpiFromVisual(Visual visual)
{
    var source = PresentationSource.FromVisual(visual);
    var dpiX = 96.0;
    var dpiY = 96.0;
    if (source?.CompositionTarget != null)
    {
        dpiX = 96.0 * source.CompositionTarget.TransformToDevice.M11;
        dpiY = 96.0 * source.CompositionTarget.TransformToDevice.M22;
    }
    return new Point(dpiX, dpiY);
}

三、使用示例

0、基础功能

这个是与第四章一致的基础功能。

（1）、引用命名空间

Window 的其他属性略

<Window xmlns:ac="clr-namespace:AC"/>

（2）、使用附加属性
需要某个控件可以拖动调整大小则

<Grid ac:Resize.IsResizeable="True" />

（3）、窗口注意事项

当Window需要使用此功能时

<Window ac:Resize.IsResizeable="True" />

Window的拖动点会放在子控件的装饰层，需要注意以几点：

①Window必须有子控件，子控件有装饰层（大部分控件都有装饰层比如Grid、Border、Button等）。

②子控件不可限定大小需要，跟随窗口大小变化。

③此功能与Window自带的调整大小区别是，此功能可以用于无边框窗口以及自定义拖动点。

1、DragResize

DragResize需要在鼠标左键按下事件中使用，对已存在的控件或者动态生成控件使用。此方法不需要

ac:Resize.IsResizeable="True"也可以使用。

xaml

<Window x:Class="WpfResize.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfResize"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"
        WindowStyle="None"
        ResizeMode="NoResize"
        >
    <Grid x:Name="grid" Background="SeaGreen"  MouseLeftButtonDown="Window_MouseLeftButtonDown"/>
</Window>

因为是拓展方法，所以获取到控件对象直接调用DragResize即可。

cs

using AC;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;

​​​​​​​namespace WpfResize
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        private async void Window_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            //生成控件
            var border = new Border();
            border.Background = Brushes.Azure;
            border.Width = 0;
            border.Height = 0;
            //加入到容器
            grid.Children.Add(border);
            //拖出控件
            await border.DragResize();
            //如果宽高为0则移除
            if (border.Width == 0|| border.Height == 0)
            {
                grid.Children.Remove(border);
            }
        }
    }
}

效果预览

注：qq录制鼠标出现了偏移

2、边界限制

设置ac:Resize.IsResizeInBounds="True"即可。边界限制的范围是父控件。

xaml

<Window x:Class="WpfResize.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfResize"
        xmlns:ac="clr-namespace:AC"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"
        WindowStyle="None"
        ResizeMode="NoResize"     
        >
    <Grid x:Name="grid" Background="SeaGreen">
        <Border BorderThickness="1" BorderBrush="White" Margin="40">
            <StackPanel>
                <Border ac:Resize.IsResizeable="True" ac:Resize.IsResizeInBounds="False" Background="White" Height="100" Width="200"  CornerRadius="10" >
                    <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Text="不限制边界"></TextBlock>
                </Border>
                <Border ac:Resize.IsResizeable="True" ac:Resize.IsResizeInBounds="True"  Margin="0,20,0,0" Background="White" Height="100" Width="200"  CornerRadius="10" >
                    <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Text="限制边界"></TextBlock>
                </Border>
            </StackPanel>
        </Border>
    </Grid>
</Window>

效果预览

注：qq录制鼠标出现了偏移

3、交叉拖动

通过附加属性ac:Resize.IsAllowsCrossover设置是否交叉拖动，默认为true。

xaml

<Window x:Class="WpfResize.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfResize"
        xmlns:ac="clr-namespace:AC"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"
        WindowStyle="None"
        ResizeMode="NoResize"     
        >
    <Grid x:Name="grid" Background="SeaGreen">
        <StackPanel>
            <Border  Margin="0,20,0,0"  ac:Resize.IsResizeable="True" ac:Resize.IsAllowsCrossover="False"  Background="White" Height="100" Width="200"  CornerRadius="10" >
                <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Text="不允许交叉拖动"></TextBlock>
            </Border>
            <Border ac:Resize.IsResizeable="True" ac:Resize.IsAllowsCrossover="True"   Margin="0,20,0,0" Background="White" Height="100" Width="200"  CornerRadius="10" >
                <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Text="允许交叉拖动"></TextBlock>
            </Border>
        </StackPanel>
    </Grid>
</Window>

效果预览

注：qq录制鼠标出现了偏移

4、拖动点布局模板

通过ac:Resize.ThumbsTemplate设置拖动点模板

（1）自定义圆点

xaml

<Window x:Class="WpfResize.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfResize"
        xmlns:ac="clr-namespace:AC"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"  
        >
    <Grid x:Name="grid" Background="White">
        <Grid  Margin="0,20,0,0"  ac:Resize.IsResizeable="True" ac:Resize.IsAllowsCrossover="False"  Background="SeaGreen " Height="100" Width="200" >
            <ac:Resize.ThumbsTemplate>
                <ControlTemplate  >
                    <Border BorderBrush="Gray" BorderThickness="2" CornerRadius="8"  Background="White" Width="16" Height="16"/>
                </ControlTemplate>
            </ac:Resize.ThumbsTemplate>
            <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Foreground="White" Text="自定义拖动点模板"></TextBlock>
        </Grid>
    </Grid>
</Window>

效果预览

（2）4个顶点

xaml

<Window x:Class="WpfResize.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfResize"
        xmlns:ac="clr-namespace:AC"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"  
        WindowStyle="None"
        ResizeMode="NoResize"
        >
    <Grid x:Name="grid" Background="White">
        <Grid  Margin="0,20,0,0"  ac:Resize.IsResizeable="True" ac:Resize.IsAllowsCrossover="False"  Background="SeaGreen " Height="100" Width="200" >
            <ac:Resize.ThumbsTemplate>
                <ControlTemplate >
                    <Border x:Name="brd" BorderBrush="Gray" BorderThickness="2" CornerRadius="8"  Background="White" Width="16" Height="16"/>
                    <!--通过触发器隐藏4条边上的点-->
                    <ControlTemplate.Triggers>
                        <!--左右两条边上的点-->
                        <Trigger Property="HorizontalAlignment" Value="Stretch">
                            <Setter TargetName="brd" Property="Visibility" Value="Collapsed" ></Setter>
                        </Trigger>
                        <!--上下两条边上的点-->
                        <Trigger Property="VerticalAlignment" Value="Stretch">
                            <Setter TargetName="brd" Property="Visibility" Value="Collapsed" ></Setter>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </ac:Resize.ThumbsTemplate>
            <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Foreground="White" Text="自定义拖动点模板"></TextBlock>
        </Grid>
    </Grid>
</Window>

效果预览

（3）单独定制每个点

通过MultiTrigger触发器来区分每个点。

xaml

<Window x:Class="WpfResize.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfResize"
        xmlns:ac="clr-namespace:AC"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"  
        WindowStyle="None"
        ResizeMode="NoResize"
        >
    <Grid x:Name="grid" Background="White">
        <Grid  Margin="0,20,0,0"  ac:Resize.IsResizeable="True" ac:Resize.IsAllowsCrossover="False"  Background="SeaGreen" Height="100" Width="200" >
            <ac:Resize.ThumbsTemplate>
                <ControlTemplate >
                    <Border x:Name="brd" BorderBrush="Gray" BorderThickness="2" CornerRadius="8"  Background="White" Width="16" Height="16"/>
                    <ControlTemplate.Triggers>
                         <!--左上-->
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="HorizontalAlignment" Value="Left" ></Condition>
                                <Condition Property="VerticalAlignment" Value="Top" ></Condition>
                            </MultiTrigger.Conditions>
                            <Setter TargetName="brd" Property="BorderBrush" Value="Aqua"></Setter>
                        </MultiTrigger>
                        <!--右上-->
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="HorizontalAlignment" Value="Right" ></Condition>
                                <Condition Property="VerticalAlignment" Value="Top" ></Condition>
                            </MultiTrigger.Conditions>
                            <Setter TargetName="brd" Property="BorderBrush" Value="DarkGoldenrod"></Setter>
                        </MultiTrigger>
                        <!--右下-->
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="HorizontalAlignment" Value="Right" ></Condition>
                                <Condition Property="VerticalAlignment" Value="Bottom" ></Condition>
                            </MultiTrigger.Conditions>
                            <Setter TargetName="brd" Property="BorderBrush" Value="DeepPink"></Setter>
                        </MultiTrigger>
                        <!--左下-->
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="HorizontalAlignment" Value="Left" ></Condition>
                                <Condition Property="VerticalAlignment" Value="Bottom" ></Condition>
                            </MultiTrigger.Conditions>
                            <Setter TargetName="brd" Property="BorderBrush" Value="Red"></Setter>
                        </MultiTrigger>
                        <!--上-->
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="HorizontalAlignment" Value="Stretch" ></Condition>
                                <Condition Property="VerticalAlignment" Value="Top" ></Condition>
                            </MultiTrigger.Conditions>
                            <Setter TargetName="brd" Property="BorderBrush" Value="Gold"></Setter>
                        </MultiTrigger>
                        <!--下-->
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="HorizontalAlignment" Value="Stretch" ></Condition>
                                <Condition Property="VerticalAlignment" Value="Bottom" ></Condition>
                            </MultiTrigger.Conditions>
                            <Setter TargetName="brd" Property="BorderBrush" Value="Indigo"></Setter>
                        </MultiTrigger>
                        <!--左-->
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="HorizontalAlignment" Value="Left" ></Condition>
                                <Condition Property="VerticalAlignment" Value="Stretch" ></Condition>
                            </MultiTrigger.Conditions>
                            <Setter TargetName="brd" Property="BorderBrush" Value="Blue"></Setter>
                        </MultiTrigger>
                        <!--右-->
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="HorizontalAlignment" Value="Right" ></Condition>
                                <Condition Property="VerticalAlignment" Value="Stretch" ></Condition>
                            </MultiTrigger.Conditions>
                            <Setter TargetName="brd" Property="BorderBrush" Value="Green"></Setter>
                        </MultiTrigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </ac:Resize.ThumbsTemplate>
            <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Foreground="White" Text="自定义拖动点模板"></TextBlock>
        </Grid>
    </Grid>
</Window>

效果预览

5、拖动点容器模板

通过ac:Resize.ThumbsPanel设置拖动点容器模板，主要作用是设置margin，方便调整拖动点的偏移。

默认的容器有Margin="-3"的偏移。

（1）无Margin

此示例是为了说明无Margin的情况。

xaml

<Window x:Class="WpfResize.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfResize"
        xmlns:ac="clr-namespace:AC"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"  
        WindowStyle="None"
        ResizeMode="NoResize"
        >
    <Grid x:Name="grid" Background="White">
        <Grid  Margin="0,20,0,0"  ac:Resize.IsResizeable="True" ac:Resize.IsAllowsCrossover="False"  Background="SeaGreen " Height="100" Width="200" >
            <ac:Resize.ThumbsTemplate>
                <ControlTemplate >
                    <Border x:Name="brd" BorderBrush="Gray" BorderThickness="2" CornerRadius="8"  Background="White" Width="16" Height="16"/>
                </ControlTemplate>
            </ac:Resize.ThumbsTemplate>
            <ac:Resize.ThumbsPanel>
                <ItemsPanelTemplate>
                    <Grid></Grid>
                </ItemsPanelTemplate>
            </ac:Resize.ThumbsPanel>
            <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Foreground="White" Text="自定义拖点容器模板"></TextBlock>
        </Grid>
    </Grid>
</Window>

效果预览

（2）设置Margin

Margin设置为拖动点的一半大小就刚好在边线中间。

xaml

<Window x:Class="WpfResize.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfResize"
        xmlns:ac="clr-namespace:AC"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"  
        WindowStyle="None"
        ResizeMode="NoResize"
        >
    <Grid x:Name="grid" Background="White">
        <Grid  Margin="0,20,0,0"  ac:Resize.IsResizeable="True" ac:Resize.IsAllowsCrossover="False"  Background="SeaGreen " Height="100" Width="200" >
            <ac:Resize.ThumbsTemplate>
                <ControlTemplate >
                    <Border x:Name="brd" BorderBrush="Gray" BorderThickness="2" CornerRadius="8"  Background="White" Width="16" Height="16"/>
                </ControlTemplate>
            </ac:Resize.ThumbsTemplate>
            <ac:Resize.ThumbsPanel>
                <ItemsPanelTemplate>
                    <Grid Margin="-8"></Grid>
                </ItemsPanelTemplate>
            </ac:Resize.ThumbsPanel>
            <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Foreground="White" Text="自定义拖点容器模板"></TextBlock>
        </Grid>
    </Grid>
</Window>

效果预览

6、整体模板

设置整体模板Template后会覆盖拖动点模板和拖动点布局模板。规则是第一级控件为容器、第二级控件为Thumb类型自动识别为拖动点，拖动方向由HorizontalAlignment和VerticalAlignment决定， 即可以有任意个拖动点Thumb，也可以放任意其他控件。

<Window x:Class="WpfResize.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfResize"
        xmlns:ac="clr-namespace:AC"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"  
        WindowStyle="None"
        ResizeMode="NoResize"
        >
    <Grid x:Name="grid" Background="White">
        <Grid  Margin="0,20,0,0"  ac:Resize.IsResizeable="True"   Background="SeaGreen " Height="100" Width="200" >
            <ac:Resize.Template>
                <ControlTemplate >
                    <Grid  Margin="-4">
                        <Grid.Resources>
                            <Style TargetType="Thumb">
                                <Setter Property="Width" Value="8"></Setter>
                                <Setter Property="Height" Value="8"></Setter>
                                <Setter Property="Template">
                                    <Setter.Value>
                                        <ControlTemplate>
                                            <Border  Background="Aqua"></Border>
                                        </ControlTemplate>
                                    </Setter.Value>
                                </Setter>
                            </Style>
                        </Grid.Resources>
                        <Border BorderBrush="Aqua"  BorderThickness="2" Margin="4"></Border>
                            <!--左-->
                        <Thumb   HorizontalAlignment="Left"  Cursor="SizeWE"/>
                        <!--上-->
                        <Thumb   VerticalAlignment="Top" Cursor="SizeNS"/>
                        <!--右-->
                        <Thumb   HorizontalAlignment="Right"  Cursor="SizeWE"/>
                        <!--下-->
                        <Thumb    VerticalAlignment="Bottom" Cursor="SizeNS"/>
                        <!--左上-->
                        <Thumb    HorizontalAlignment="Left" VerticalAlignment="Top" Cursor="SizeNWSE"/>
                        <!--右上-->
                        <Thumb    HorizontalAlignment="Right" VerticalAlignment="Top"  Cursor="SizeNESW"/>
                        <!--右下-->
                        <Thumb    HorizontalAlignment="Right" VerticalAlignment="Bottom"  Cursor="SizeNWSE"/>
                        <!--左下-->
                        <Thumb    HorizontalAlignment="Left" VerticalAlignment="Bottom" Cursor="SizeNESW"/>
                    </Grid>
                </ControlTemplate>
            </ac:Resize.Template>
            <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Foreground="White" Text="自定义整体模板"></TextBlock>
        </Grid>
    </Grid>
</Window>

效果预览

7、窗口平滑拖动

窗口为透明窗口（AllowTransparency为true或者WindowChrome的GlassFrameThickness为-1），附加属性 ac:Resize.IsWindowDragSmooth设置为true即可以实现平滑拖动。

注：当前版本和装饰器不兼容，拖动时装饰器可能显示在窗口外面，谨慎使用此属性

<Window x:Class="WpfResize.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfResize"
        xmlns:ac="clr-namespace:AC"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"  
        WindowStyle="None"
        ResizeMode="NoResize"
        AllowsTransparency="True"
        ac:Resize.IsResizeable="True"
        ac:Resize.IsWindowDragSmooth="True"
        >
    <Grid Background="SeaGreen "/>
</Window>

作为对比先展示非平滑拖动

注：qq录制鼠标出现了偏移

设置平滑拖动效果预览

注：qq录制鼠标出现了偏移

8、拖动事件

3个事件，拖动开始ac:Resize.DragResizeStarted、拖动变化ac:Resize.DragResizeDelta、拖动结束ac:Resize.DragResizeCompleted

xaml

<Window x:Class="WpfResize.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfResize"
        xmlns:ac="clr-namespace:AC"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"  
        >
    <Grid Background="SeaGreen ">
        <Border Background="Aqua" Width="200" Height="200"   ac:Resize.IsResizeable="True"  ac:Resize.DragResizeStarted="Border_DragResizeStarted"  ac:Resize.DragResizeCompleted="Border_DragResizeCompleted" ac:Resize.DragResizeDelta="Border_DragResizeDelta"></Border>
    </Grid>
</Window>

cs

using AC;
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;

namespace WpfResize
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Border_DragResizeStarted(object sender, DragResizeStartedEventArgs e)
        {
            Console.WriteLine("开始拖动");
        }

        private void Border_DragResizeCompleted(object sender, DragResizeCompletedEventArgs e)
        {
            Console.WriteLine("结束拖动");
        }

​​​​​​​        private void Border_DragResizeDelta(object sender, DragResizeDeltaEventArgs e)
        {
            Console.WriteLine("横向变化:"+e.HorizontalChange+ " 纵向变化:"+e.VerticalChange+ " 宽变化:" + e.WidthChange + " 高变化:" + e.HeightChange);
        }
    }
}

效果预览

注：qq录制鼠标出现了偏移

9、其他功能

（1）适应MinWidth、MinHeight

xaml

<Window x:Class="WpfResize.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfResize"
        xmlns:ac="clr-namespace:AC"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"  
        >
    <Grid Background="SeaGreen ">
        <Border Background="Aqua" MinWidth="100" MinHeight="100" Width="200" Height="200"   ac:Resize.IsResizeable="True"  ></Border>
    </Grid>
</Window>

效果预览

注：qq录制鼠标出现了偏移

（2）适应MaxWidth、MaxHeight

xaml

<Window x:Class="WpfResize.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfResize"
        xmlns:ac="clr-namespace:AC"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"  
        >
    <Grid Background="SeaGreen ">
        <Border Background="Aqua" MaxWidth="200" MaxHeight="200" Width="100" Height="100"   ac:Resize.IsResizeable="True"  ></Border>
    </Grid>
</Window>

效果预览

总结

拓展后的功能更加全面以及兼容性更强了，比如DragRezie就可以用于画板，边界限制也是比较实用的功能，拖动点模板简化了自定义的难度，拖动事件可以用于实现撤销重做功能，窗口平滑拖动优化了使用体验。但是还是有些功能不够完，需要后期继续优化。总的来说，本文实现的拖动调整大小模块已经变得更加方便实用，后期还会继续完善优化。

以上就是C# wpf实现任意控件更多调整大小功能的详细内容，更多关于C# wpf控件调整的资料请关注脚本之家其它相关文章！

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