WPF拖动改变大小系列
第一节 Grid内控件拖动调整大小
第二节 Canvas内控件拖动调整大小
第三节 窗口拖动调整大小
第四节 附加属性实现拖动调整大小
第五章 拓展更多调整大小功能(本章)
文章目录
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>publicstaticasyncTaskDragResize(thisFrameworkElement elememt){if(Mouse.LeftButton != MouseButtonState.Pressed){thrownewInvalidOperationException("Left button down to call this method");}if(elememt.Parent ==null&& elememt isnotWindow){thrownewInvalidOperationException("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:
publicstaticboolGetIsResizeInBounds(DependencyObject obj){return(bool)obj.GetValue(IsResizeInBoundsProperty);}publicstaticvoidSetIsResizeInBounds(DependencyObject obj,boolvalue){
obj.SetValue(IsResizeInBoundsProperty,value);}/// <summary>/// 是否在父控件范围内拖动/// </summary>publicstaticreadonlyDependencyProperty IsResizeInBoundsProperty =
DependencyProperty.RegisterAttached("IsResizeInBounds",typeof(bool),typeof(Resize),newPropertyMetadata(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 asFrameworkElement;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;}elseif(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;}elseif(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(newThickness(margin.Left + c.Width - minWidth, margin.Top, margin.Right - c.Width + minWidth, margin.Bottom));}else//右拖动点{SetTargetMargin(newThickness(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 =newMouseButtonEventArgs(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 =newMouseButtonEventArgs(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
publicstaticControlTemplateGetThumbsTemplate(DependencyObject obj){return(ControlTemplate)obj.GetValue(ThumbsTemplateProperty);}publicstaticvoidSetThumbsTemplate(DependencyObject obj,ControlTemplatevalue){
obj.SetValue(ThumbsTemplateProperty,value);}/// <summary>/// 拖动点的模板/// </summary>publicstaticreadonlyDependencyProperty ThumbsTemplateProperty =
DependencyProperty.RegisterAttached("ThumbsTemplate",typeof(ControlTemplate),typeof(Resize),newPropertyMetadata(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。
publicstaticItemsPanelTemplateGetThumbsPanel(DependencyObject obj){return(ItemsPanelTemplate)obj.GetValue(ThumbsPanelProperty);}publicstaticvoidSetThumbsPanel(DependencyObject obj,ItemsPanelTemplatevalue){
obj.SetValue(ThumbsPanelProperty,value);}/// <summary>/// 拖动点的容器,主要用于设置margin/// </summary>publicstaticreadonlyDependencyProperty ThumbsPanelProperty =
DependencyProperty.RegisterAttached("ThumbsPanel",typeof(ItemsPanelTemplate),typeof(Resize),newPropertyMetadata(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。
publicstaticboolGetIsWindowDragSmooth(DependencyObject obj){return(bool)obj.GetValue(IsWindowDragSmoothProperty);}publicstaticvoidSetIsWindowDragSmooth(DependencyObject obj,boolvalue){
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...publicstaticreadonlyDependencyProperty IsWindowDragSmoothProperty =
DependencyProperty.RegisterAttached("IsWindowDragSmooth",typeof(bool),typeof(Resize),newPropertyMetadata(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>publicstaticreadonlyRoutedEvent DragResizeStartedEvent = EventManager.RegisterRoutedEvent("DragResizeStarted", RoutingStrategy.Direct,typeof(EventHandler<DragResizeStartedEventArgs>),typeof(Resize));/// <summary>/// 拖动变化事件/// </summary>publicstaticreadonlyRoutedEvent DragResizeDeltaEvent = EventManager.RegisterRoutedEvent("DragResizeDelta", RoutingStrategy.Direct,typeof(EventHandler<DragResizeDeltaEventArgs>),typeof(Resize));/// <summary>/// 拖动结束事件/// </summary>publicstaticreadonlyRoutedEvent 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。
staticPointGetDpiFromVisual(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;}returnnewPoint(dpiX, dpiY);}
二、完整代码
vs2022 wpf .net 6.0 项目,包含了第四章的功能,不需要重复下载。如果需要单独使用Resize.cs文件需要添加依赖,参考附录。
https://download.csdn.net/download/u013113678/88749991
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
<Windowxmlns: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
<Gridac:Resize.IsDragResizeable="True"/>
(3)、窗口注意事项
当Window需要使用此功能时
<Windowac:Resize.IsDragResizeable="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.IsDragResizeable="True"也可以使用。
xaml
<Windowx: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"><Gridx: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
usingAC;usingSystem.Windows;usingSystem.Windows.Controls;usingSystem.Windows.Input;usingSystem.Windows.Media;namespaceWpfResize{/// <summary>/// Interaction logic for MainWindow.xaml/// </summary>publicpartialclassMainWindow:Window{publicMainWindow(){InitializeComponent();}privateasyncvoidWindow_MouseLeftButtonDown(object sender,MouseButtonEventArgs e){//生成控件var border =newBorder();
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
<Windowx: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"><Gridx:Name="grid"Background="SeaGreen"><BorderBorderThickness="1"BorderBrush="White"Margin="40"><StackPanel><Borderac:Resize.IsDragResizeable="True"ac:Resize.IsResizeInBounds="False"Background="White"Height="100"Width="200"CornerRadius="10"><TextBlockHorizontalAlignment="Center"VerticalAlignment="Center"Text="不限制边界"></TextBlock></Border><Borderac:Resize.IsDragResizeable="True"ac:Resize.IsResizeInBounds="True"Margin="0,20,0,0"Background="White"Height="100"Width="200"CornerRadius="10"><TextBlockHorizontalAlignment="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
<Windowx: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"><Gridx:Name="grid"Background="SeaGreen"><StackPanel><BorderMargin="0,20,0,0"ac:Resize.IsDragResizeable="True"ac:Resize.IsAllowsCrossover="False"Background="White"Height="100"Width="200"CornerRadius="10"><TextBlockHorizontalAlignment="Center"VerticalAlignment="Center"Text="不允许交叉拖动"></TextBlock></Border><Borderac:Resize.IsDragResizeable="True"ac:Resize.IsAllowsCrossover="True"Margin="0,20,0,0"Background="White"Height="100"Width="200"CornerRadius="10"><TextBlockHorizontalAlignment="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
<Windowx: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"><Gridx:Name="grid"Background="White"><GridMargin="0,20,0,0"ac:Resize.IsDragResizeable="True"ac:Resize.IsAllowsCrossover="False"Background="SeaGreen "Height="100"Width="200"><ac:Resize.ThumbsTemplate><ControlTemplate><BorderBorderBrush="Gray"BorderThickness="2"CornerRadius="8"Background="White"Width="16"Height="16"/></ControlTemplate></ac:Resize.ThumbsTemplate><TextBlockHorizontalAlignment="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
<Windowx: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"><Gridx:Name="grid"Background="White"><GridMargin="0,20,0,0"ac:Resize.IsDragResizeable="True"ac:Resize.IsAllowsCrossover="False"Background="SeaGreen "Height="100"Width="200"><ac:Resize.ThumbsTemplate><ControlTemplate><Borderx: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--><TriggerProperty="HorizontalAlignment"Value="Stretch"><SetterTargetName="brd"Property="Visibility"Value="Collapsed"></Setter></Trigger><!--上下两条边上的点--><TriggerProperty="VerticalAlignment"Value="Stretch"><SetterTargetName="brd"Property="Visibility"Value="Collapsed"></Setter></Trigger></ControlTemplate.Triggers></ControlTemplate></ac:Resize.ThumbsTemplate><TextBlockHorizontalAlignment="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
<Windowx: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"><Gridx:Name="grid"Background="White"><GridMargin="0,20,0,0"ac:Resize.IsDragResizeable="True"ac:Resize.IsAllowsCrossover="False"Background="SeaGreen"Height="100"Width="200"><ac:Resize.ThumbsTemplate><ControlTemplate><Borderx:Name="brd"BorderBrush="Gray"BorderThickness="2"CornerRadius="8"Background="White"Width="16"Height="16"/><ControlTemplate.Triggers><!--左上--><MultiTrigger><MultiTrigger.Conditions><ConditionProperty="HorizontalAlignment"Value="Left"></Condition><ConditionProperty="VerticalAlignment"Value="Top"></Condition></MultiTrigger.Conditions><SetterTargetName="brd"Property="BorderBrush"Value="Aqua"></Setter></MultiTrigger><!--右上--><MultiTrigger><MultiTrigger.Conditions><ConditionProperty="HorizontalAlignment"Value="Right"></Condition><ConditionProperty="VerticalAlignment"Value="Top"></Condition></MultiTrigger.Conditions><SetterTargetName="brd"Property="BorderBrush"Value="DarkGoldenrod"></Setter></MultiTrigger><!--右下--><MultiTrigger><MultiTrigger.Conditions><ConditionProperty="HorizontalAlignment"Value="Right"></Condition><ConditionProperty="VerticalAlignment"Value="Bottom"></Condition></MultiTrigger.Conditions><SetterTargetName="brd"Property="BorderBrush"Value="DeepPink"></Setter></MultiTrigger><!--左下--><MultiTrigger><MultiTrigger.Conditions><ConditionProperty="HorizontalAlignment"Value="Left"></Condition><ConditionProperty="VerticalAlignment"Value="Bottom"></Condition></MultiTrigger.Conditions><SetterTargetName="brd"Property="BorderBrush"Value="Red"></Setter></MultiTrigger><!--上--><MultiTrigger><MultiTrigger.Conditions><ConditionProperty="HorizontalAlignment"Value="Stretch"></Condition><ConditionProperty="VerticalAlignment"Value="Top"></Condition></MultiTrigger.Conditions><SetterTargetName="brd"Property="BorderBrush"Value="Gold"></Setter></MultiTrigger><!--下--><MultiTrigger><MultiTrigger.Conditions><ConditionProperty="HorizontalAlignment"Value="Stretch"></Condition><ConditionProperty="VerticalAlignment"Value="Bottom"></Condition></MultiTrigger.Conditions><SetterTargetName="brd"Property="BorderBrush"Value="Indigo"></Setter></MultiTrigger><!--左--><MultiTrigger><MultiTrigger.Conditions><ConditionProperty="HorizontalAlignment"Value="Left"></Condition><ConditionProperty="VerticalAlignment"Value="Stretch"></Condition></MultiTrigger.Conditions><SetterTargetName="brd"Property="BorderBrush"Value="Blue"></Setter></MultiTrigger><!--右--><MultiTrigger><MultiTrigger.Conditions><ConditionProperty="HorizontalAlignment"Value="Right"></Condition><ConditionProperty="VerticalAlignment"Value="Stretch"></Condition></MultiTrigger.Conditions><SetterTargetName="brd"Property="BorderBrush"Value="Green"></Setter></MultiTrigger></ControlTemplate.Triggers></ControlTemplate></ac:Resize.ThumbsTemplate><TextBlockHorizontalAlignment="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
<Windowx: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"><Gridx:Name="grid"Background="White"><GridMargin="0,20,0,0"ac:Resize.IsDragResizeable="True"ac:Resize.IsAllowsCrossover="False"Background="SeaGreen "Height="100"Width="200"><ac:Resize.ThumbsTemplate><ControlTemplate><Borderx: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><TextBlockHorizontalAlignment="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
<Windowx: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"><Gridx:Name="grid"Background="White"><GridMargin="0,20,0,0"ac:Resize.IsDragResizeable="True"ac:Resize.IsAllowsCrossover="False"Background="SeaGreen "Height="100"Width="200"><ac:Resize.ThumbsTemplate><ControlTemplate><Borderx:Name="brd"BorderBrush="Gray"BorderThickness="2"CornerRadius="8"Background="White"Width="16"Height="16"/></ControlTemplate></ac:Resize.ThumbsTemplate><ac:Resize.ThumbsPanel><ItemsPanelTemplate><GridMargin="-8"></Grid></ItemsPanelTemplate></ac:Resize.ThumbsPanel><TextBlockHorizontalAlignment="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。
<Windowx: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"><Gridx:Name="grid"Background="White"><GridMargin="0,20,0,0"ac:Resize.IsDragResizeable="True"Background="SeaGreen "Height="100"Width="200"><ac:Resize.Template><ControlTemplate><GridMargin="-4"><Grid.Resources><StyleTargetType="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><BorderBorderBrush="Aqua"BorderThickness="2"Margin="4"></Border><!--左--><ThumbHorizontalAlignment="Left"Cursor="SizeWE"/><!--上--><ThumbVerticalAlignment="Top"Cursor="SizeNS"/><!--右--><ThumbHorizontalAlignment="Right"Cursor="SizeWE"/><!--下--><ThumbVerticalAlignment="Bottom"Cursor="SizeNS"/><!--左上--><ThumbHorizontalAlignment="Left"VerticalAlignment="Top"Cursor="SizeNWSE"/><!--右上--><ThumbHorizontalAlignment="Right"VerticalAlignment="Top"Cursor="SizeNESW"/><!--右下--><ThumbHorizontalAlignment="Right"VerticalAlignment="Bottom"Cursor="SizeNWSE"/><!--左下--><ThumbHorizontalAlignment="Left"VerticalAlignment="Bottom"Cursor="SizeNESW"/></Grid></ControlTemplate></ac:Resize.Template><TextBlockHorizontalAlignment="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
<Windowx: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.IsDragResizeable="True"ac:Resize.IsWindowDragSmooth="True"><GridBackground="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
<Windowx: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"><GridBackground="SeaGreen "><BorderBackground="Aqua"Width="200"Height="200"ac:Resize.IsDragResizeable="True"ac:Resize.DragResizeStarted="Border_DragResizeStarted"ac:Resize.DragResizeCompleted="Border_DragResizeCompleted"ac:Resize.DragResizeDelta="Border_DragResizeDelta"></Border></Grid></Window>
cs
usingAC;usingSystem;usingSystem.Windows;usingSystem.Windows.Controls;usingSystem.Windows.Input;usingSystem.Windows.Media;namespaceWpfResize{/// <summary>/// Interaction logic for MainWindow.xaml/// </summary>publicpartialclassMainWindow:Window{publicMainWindow(){InitializeComponent();}privatevoidBorder_DragResizeStarted(object sender,DragResizeStartedEventArgs e){
Console.WriteLine("开始拖动");}privatevoidBorder_DragResizeCompleted(object sender,DragResizeCompletedEventArgs e){
Console.WriteLine("结束拖动");}privatevoidBorder_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
<Windowx: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"><GridBackground="SeaGreen "><BorderBackground="Aqua"MinWidth="100"MinHeight="100"Width="200"Height="200"ac:Resize.IsDragResizeable="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
<Windowx: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"><GridBackground="SeaGreen "><BorderBackground="Aqua"MaxWidth="200"MaxHeight="200"Width="100"Height="100"ac:Resize.IsDragResizeable="True"></Border></Grid></Window>
效果预览
总结
以上就是今天要讲的内容,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。
附录
1、依赖System.Drawing
完整代码依赖了System.Drawing,添加依赖的方法参考C# wpf 使用GDI+实现截屏的第一节。
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