ResourceDictionary中的交互触发器WPF

本文介绍了ResourceDictionary中的交互触发器WPF的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！问题描述

我有一个 ComboBox ，我需要在我的应用程序中的几个地方使用，所以我设置 ComboBox 在 ResourceDictionary ，并将其用作我需要它的样式。

ComboBox 是：

< Style TargetType ={x：Type ComboBox}x：Key =ComboBoxBranch> < Setter Property =ItemsSourceValue ={Binding Branches}>< / Setter> < Setter Property =DisplayMemberPathValue =BranchName>< / Setter> < Setter Property =SelectedItemValue ={Binding SelectedBranch}>< / Setter> < / Style>

我在我的XAML中使用它：

< ComboBox Style ={StaticResource ComboBoxBranch}> < i：Interaction.Triggers> < i：EventTrigger EventName =SelectionChanged> < i：InvokeCommandAction Command ={Binding SelectCustomerCommand}CommandParameter ={Binding SelectedBranch}>< / i：InvokeCommandAction> < / i：EventTrigger> < / i：Interaction.Triggers> < / ComboBox>

我想将交互触发器代码移动到 ResourceDictionary ，所以我不需要写在所有的xamls。可能以某种方式？

解决方案

据我所知， Interaction.Triggers 不能分别应用在Style中和ResourceDictionary中。但是你可以这样做，确定 ComboBox 作为一个资源与 x：Shared =False ContentControl 如下：

< Window.Resources> < ComboBox x：Key =MyComboBoxx：Shared =False ItemsSource ={Binding Branches} DisplayMemberPath =BranchName SelectedItem ={Binding SelectedBranch}> < i：Interaction.Triggers> < i：EventTrigger EventName =SelectionChanged> < i：InvokeCommandAction Command ={Binding SelectCustomerCommand}/> < / i：EventTrigger> < / i：Interaction.Triggers> < / ComboBox> < /Window.Resources> < Grid> &ContentControl Name =MyComboBox1 Width =100 Height =30 HorizontalAlignment =Left Content ={StaticResource MyComboBox} /> < ContentControl Name =MyComboBox2 Width =100 Height =30 HorizontalAlignment =Right Content = {StaticResource MyComboBox}/> < / Grid>

当 x：Shared =True默认情况下，一个样式是所有的共同 - 在这种情况下，系统发出重复的内容。当 x：Shared =False时创建每个元素的Style，当它请求时。引自 MSDN ：

设置为 false 时，修改WPF资源检索行为，对于每个请求，为属性资源创建一个新实例，而不是为所有请求共享相同的实例。

有关详情，请参阅：

MSDN：x：共享属性

编辑：替代解决方案

Here，Mr.Vspivak发布了一个解决方案，允许您轻松地在样式中设置 Interaction.Triggers 。

示例：

MainWindow.xaml p>

< Window x：Class =StylesInteractivity.MainWindow xmlns =schemas.microsoft / winfx / 2006 / xaml / presentation xmlns：x =schemas.microsoft/winfx/2006/xaml xmlns：ie =clr-namespace：System.Windows .Interactivity; assembly = System.Windows.Interactivity xmlns：Core =clr-namespace：Microsoft.Expression.Interactivity.Core; assembly = Microsoft.Expression.Interactions xmlns：int =clr -namespace：System.Windows.Interactivity xmlns：si =clr-namespace：StylesInteractivity Title =MainWindowHeight =350Width =525> < Window.Resources> < si：ViewModel x：Key =Model/> < /Window.Resources> < grid> < Grid.ColumnDefinitions> < ColumnDefinition /> < ColumnDefinition /> < /Grid.ColumnDefinitions> < TextBlock Grid.Column =1x：Name =_ tblock Text =Default HorizontalAlignment =Center VerticalAlignment = Center FontSize =24 FontWeight =Bold/> < ListBox ItemsSource ={Binding Source = {StaticResource Model}，Path = DataSource} Grid.Column =0 HorizontalAlignment =Center VerticalAlignment =Center> < ListBox.ItemContainerStyle> < Style TargetType =ListBoxItem> < Setter Property =FontSizeValue =24/> < Setter Property =FontWeightValue =Bold/> < Setter Property =int：InteractivityItems.Template> < Setter.Value> < int：InteractivityTemplate> < int：InteractivityItems> < int：InteractivityItems.Behaviors> < int：FlipOnHover /> < / int：InteractivityItems.Behaviors> < int：InteractivityItems.Triggers> < ie：EventTrigger EventName =MouseMove> < Core：ChangePropertyAction PropertyName =Text TargetObject ={Binding ElementName = _tblock} Value ={Binding}/> < / ie：EventTrigger> < / int：InteractivityItems.Triggers> < / int：InteractivityItems> < / int：InteractivityTemplate> < /Setter.Value> < / Setter> < / Style> < /ListBox.ItemContainerStyle> < / ListBox> < / Grid> < / Window>

InteractivityHelper.cs

///< summary> ///< see cref =FrameworkTemplate/>对于InteractivityElements实例 ///< remarks>子类为向前兼容性，也许有一天< see cref =FrameworkTemplate/> < / remarks> ///< remarks>不会部分内部< / remarks> ///< / summary> public class InteractivityTemplate：DataTemplate { } ///< summary> ///用于交互项的持有者 ///< / summary> public class InteractivityItems：FrameworkElement { private List< Behavior> _行为; private List< TriggerBase> _triggers; ///< summary> ///触发器的存储 ///< / summary> public List< TriggerBase>触发器 { get { if（_triggers == null） _triggers = new List< TriggerBase>（）; return _triggers; } } ///< summary> ///行为存储 ///< / summary> public List< Behavior>行为 { get { if（_behaviors == null） _behaviors = new List< Behavior>（）; return _behaviors; } } #region模板附加属性 public static InteractivityTemplate GetTemplate（DependencyObject obj） { return InteractivityTemplate）obj.GetValue（TemplateProperty）; } public static void SetTemplate（DependencyObject obj，InteractivityTemplate value） { obj.SetValue（TemplateProperty，value）; } public static readonly DependencyProperty TemplateProperty = DependencyProperty.RegisterAttached（Template， typeof（InteractivityTemplate）， typeof（InteractivityItems）， new PropertyMetadata（default（InteractivityTemplate），OnTemplateChanged））; private static void OnTemplateChanged（ DependencyObject d， DependencyPropertyChangedEventArgs e） { InteractivityTemplate dt =（InteractivityTemplate）e.NewValue; #if（！SILVERLIGHT） dt.Seal（）; #endif InteractivityItems ih =（InteractivityItems）dt.LoadContent（）; BehaviorCollection bc = Interaction.GetBehaviors（d）; TriggerCollection tc = Interaction.GetTriggers（d）; foreach（ih.Behaviors中的行为行为） bc.Add（behavior）; foreach（ih.Triggers中的TriggerBase触发器） tc.Add（trigger）; } #endregion }

code> FlipOnHover.cs

public class FlipOnHover：Behavior< FrameworkElement> { protected override void OnAttached（） { AssociatedObject.MouseEnter + = AssociatedObject_MouseEnter; AssociatedObject.MouseLeave + = AssociatedObject_MouseLeave; Transform t = AssociatedObject.RenderTransform; AssociatedObject.RenderTransform = new TransformGroup（）; （（TransformGroup）AssociatedObject.RenderTransform）.Children.Add（t）; （（TransformGroup）AssociatedObject.RenderTransform）.Children.Add（new ScaleTransform（））; base.OnAttached（）; } void AssociatedObject_MouseLeave（object sender，System.Windows.Input.MouseEventArgs e） {（（ScaleTransform）（（TransformGroup）AssociatedObject.RenderTransform）。儿童[1]）。 } void AssociatedObject_MouseEnter（object sender，System.Windows.Input.MouseEventArgs e） {（（ScaleTransform）（（TransformGroup）AssociatedObject.RenderTransform）。 Children [1]）。CenterX = AssociatedObject.ActualWidth / 2; （（ScaleTransform）（（TransformGroup）AssociatedObject.RenderTransform）.Children [1]。CenterY = AssociatedObject.ActualHeight / 2; （（ScaleTransform）（（TransformGroup）AssociatedObject.RenderTransform）.Children [1]）ScaleY = -1; } protected override void OnDetaching（） { base.OnDetaching（）; AssociatedObject.MouseEnter - = AssociatedObject_MouseEnter; AssociatedObject.MouseLeave - = AssociatedObject_MouseLeave; } }

ViewModel.cs

public class ViewModel { private ObservableCollection< String> _dataSource = new ObservableCollection< string>（）; public ViewModel（） { _dataSource.Add（Cat）; _dataSource.Add（Dog）; _dataSource.Add（Mouse）; _dataSource.Add（Owl）; _dataSource.Add（Rabbit）; } public IEnumerable< string> DataSource { get {return _dataSource; } } }

有关详细信息， p>

在WPF / Silverlight样式中使用交互行为和操作

I have a ComboBox which I need to use in several places in my application, so I set most of the properties of that ComboBox in ResourceDictionary and use that as a Style where ever I need it.

Style for the ComboBox is:

and I am using it like this in my XAML:

I want to move the interaction trigger code as well to ResourceDictionary, so I don't need to write it in all my xamls. Is it possible somehow?

解决方案

As far as I know, Interaction.Triggers can not be applied in Style, respectively and in a ResourceDictionary. But you can do so, to determine the ComboBox as a resource with x:Shared="False" and reference it for ContentControl like this:

<Window.Resources> <ComboBox x:Key="MyComboBox" x:Shared="False" ItemsSource="{Binding Branches}" DisplayMemberPath="BranchName" SelectedItem="{Binding SelectedBranch}"> <i:Interaction.Triggers> <i:EventTrigger EventName="SelectionChanged"> <i:InvokeCommandAction Command="{Binding SelectCustomerCommand}" /> </i:EventTrigger> </i:Interaction.Triggers> </ComboBox> </Window.Resources> <Grid> <ContentControl Name="MyComboBox1" Width="100" Height="30" HorizontalAlignment="Left" Content="{StaticResource MyComboBox}" /> <ContentControl Name="MyComboBox2" Width="100" Height="30" HorizontalAlignment="Right" Content="{StaticResource MyComboBox}" /> </Grid>

When x:Shared="True" by default then one Style is common to all - in this case, the system swears on the duplicate Content. When x:Shared="False" when is created Style for each element whenever it its request. Quote from MSDN:

When set to false, modifies WPF resource-retrieval behavior so that requests for the attributed resource create a new instance for each request instead of sharing the same instance for all requests.

For more information, please see:

MSDN: x:Shared Attribute

Edit: alternative solution

Here, Mr.Vspivak published a solution that allows you easily set the Interaction.Triggers in Style.

Example:

MainWindow.xaml

InteractivityHelper.cs

/// <summary> /// <see cref="FrameworkTemplate"/> for InteractivityElements instance /// <remarks>Subclassed for forward compatibility, perhaps one day <see cref="FrameworkTemplate"/> </remarks> /// <remarks>will not be partially internal</remarks> /// </summary> public class InteractivityTemplate : DataTemplate { } /// <summary> /// Holder for interactivity entries /// </summary> public class InteractivityItems : FrameworkElement { private List<Behavior> _behaviors; private List<TriggerBase> _triggers; /// <summary> /// Storage for triggers /// </summary> public List<TriggerBase> Triggers { get { if (_triggers == null) _triggers = new List<TriggerBase>(); return _triggers; } } /// <summary> /// Storage for Behaviors /// </summary> public List<Behavior> Behaviors { get { if (_behaviors == null) _behaviors = new List<Behavior>(); return _behaviors; } } #region Template attached property public static InteractivityTemplate GetTemplate(DependencyObject obj) { return (InteractivityTemplate)obj.GetValue(TemplateProperty); } public static void SetTemplate(DependencyObject obj, InteractivityTemplate value) { obj.SetValue(TemplateProperty, value); } public static readonly DependencyProperty TemplateProperty = DependencyProperty.RegisterAttached("Template", typeof(InteractivityTemplate), typeof(InteractivityItems), new PropertyMetadata(default(InteractivityTemplate), OnTemplateChanged)); private static void OnTemplateChanged( DependencyObject d, DependencyPropertyChangedEventArgs e) { InteractivityTemplate dt = (InteractivityTemplate)e.NewValue; #if(!SILVERLIGHT) dt.Seal(); #endif InteractivityItems ih = (InteractivityItems)dt.LoadContent(); BehaviorCollection bc = Interaction.GetBehaviors(d); TriggerCollection tc = Interaction.GetTriggers(d); foreach (Behavior behavior in ih.Behaviors) bc.Add(behavior); foreach (TriggerBase trigger in ih.Triggers) tc.Add(trigger); } #endregion }

FlipOnHover.cs

public class FlipOnHover : Behavior<FrameworkElement> { protected override void OnAttached() { AssociatedObject.MouseEnter += AssociatedObject_MouseEnter; AssociatedObject.MouseLeave += AssociatedObject_MouseLeave; Transform t = AssociatedObject.RenderTransform; AssociatedObject.RenderTransform = new TransformGroup(); ((TransformGroup)AssociatedObject.RenderTransform).Children.Add(t); ((TransformGroup)AssociatedObject.RenderTransform).Children.Add(new ScaleTransform()); base.OnAttached(); } void AssociatedObject_MouseLeave(object sender, System.Windows.Input.MouseEventArgs e) { ((ScaleTransform)((TransformGroup)AssociatedObject.RenderTransform).Children[1]).ScaleY = 1; } void AssociatedObject_MouseEnter(object sender, System.Windows.Input.MouseEventArgs e) { ((ScaleTransform)((TransformGroup)AssociatedObject.RenderTransform).Children[1]).CenterX = AssociatedObject.ActualWidth / 2; ((ScaleTransform)((TransformGroup)AssociatedObject.RenderTransform).Children[1]).CenterY = AssociatedObject.ActualHeight / 2; ((ScaleTransform)((TransformGroup)AssociatedObject.RenderTransform).Children[1]).ScaleY=-1; } protected override void OnDetaching() { base.OnDetaching(); AssociatedObject.MouseEnter -= AssociatedObject_MouseEnter; AssociatedObject.MouseLeave -= AssociatedObject_MouseLeave; } }

ViewModel.cs

public class ViewModel { private ObservableCollection<String> _dataSource = new ObservableCollection<string>(); public ViewModel() { _dataSource.Add("Cat"); _dataSource.Add("Dog"); _dataSource.Add("Mouse"); _dataSource.Add("Owl"); _dataSource.Add("Rabbit"); } public IEnumerable<string> DataSource { get { return _dataSource; } } }

For more info, see this link:

Using Interactivity Behaviors and Actions in WPF/Silverlight Styles

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ResourceDictionary中的交互触发器WPF