如何从XAML元素的资源中访问一个故事板？ [英] How to access a storyboard within an element resources from XAML?
本文介绍了如何从XAML元素的资源中访问一个故事板？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
考虑这个code：
＆LT;用户控件X：类=MyApp.MyControl
...
XMLNS：地方=CLR的命名空间：MyApp的
的DataContext ={绑定的RelativeSource = {的RelativeSource模式=自}}＆GT; ＆LT; UserControl.Template＆GT;
＆LT;＆控件模板GT;
＆LT; ControlTemplate.Resources＆GT;
＆LT;情节提要X：键=MyStory＆GT;
＆LT; ColorAnimationUsingKeyFrames Storyboard.TargetProperty =。（Border.BorderBrush）（SolidColorBrush.Color）Storyboard.TargetName =brdBase＆GT;
＆LT; SplineColorKeyFrame KeyTime =0：0：1VALUE =红/＆GT;
＆LT; / ColorAnimationUsingKeyFrames＆GT;
＆LT; /故事板＆GT;
＆LT; /ControlTemplate.Resources> ＆LT; BORDER X：NAME =brdBase了borderThickness =1BorderBrush =青色背景=黑＆GT;
...
＆LT; /边框＆GT; ＆LT; ControlTemplate.Triggers＆GT;
＆LT;触发SOURCENAME =brdBase属性=IsMouseOverVALUE =真＆GT;
＆LT; Trigger.EnterActions＆GT;
＆LT; BeginStoryboard故事板={StaticResource的MyStory}/＆GT;
＆LT; /Trigger.EnterActions>
＆LT; /触发＆GT;
＆LT; /ControlTemplate.Triggers>
＆LT; /控件模板＆GT;
＆LT; /UserControl.Template>
＆LT; /用户控件＆GT;
以上code工作没有问题。现在，我想 MyStory 的绑定关键帧的值给该用户控制等构成的DP（名为 SpecialColor ）所以：
＆LT;情节提要X：键=MyStory＆GT;
＆LT; ColorAnimationUsingKeyFrames Storyboard.TargetProperty =。（Border.BorderBrush）（SolidColorBrush.Color）Storyboard.TargetName =brdBase＆GT;
＆LT; SplineColorKeyFrame KeyTime =0：0：1VALUE ={绑定的RelativeSource = {的RelativeSource模式= FindAncestor，AncestorType = {X：类型本地：MyControl}}，路径= SpecialColor}/＆GT;
＆LT; / ColorAnimationUsingKeyFrames＆GT;
＆LT; /故事板＆GT;
这使得一个错误：
的无法冻结这个故事板时间表树用于跨线程。的
这是可能的背后做到这一点使用code。但是，我怎么能做到这一点XAML中的？
code-背后辅助解决方案：
►的步骤1：的把 MyStory 故事板到 brdBase 资源
＆LT; UserControl.Template＆GT;
＆LT;＆控件模板GT;
＆LT; BORDER X：NAME =brdBase了borderThickness =1BorderBrush =青色背景=黑＆GT;
＆LT; Border.Resources＆GT;
＆LT;情节提要X：键=MyStory＆GT;
＆LT; ColorAnimationUsingKeyFrames Storyboard.TargetProperty =。（Border.BorderBrush）（SolidColorBrush.Color）Storyboard.TargetName =brdBase＆GT;
＆LT; SplineColorKeyFrame KeyTime =0：0：1VALUE ={绑定的RelativeSource = {的RelativeSource模式= FindAncestor，AncestorType = {X：类型本地：MyControl}}，路径= SpecialColor}/＆GT;
＆LT; / ColorAnimationUsingKeyFrames＆GT;
＆LT; /故事板＆GT;
＆LT; /Border.Resources>
...
＆LT; /边框＆GT; ＆LT; ControlTemplate.Triggers＆GT;
＆LT;触发SOURCENAME =brdBase属性=IsMouseOverVALUE =真＆GT;
＆LT; Trigger.EnterActions＆GT;
＆LT; BeginStoryboard故事板={StaticResource的MyStory}/＆GT;
＆LT; /Trigger.EnterActions>
＆LT; /触发＆GT;
＆LT; /ControlTemplate.Triggers>
＆LT; /控件模板＆GT;
＆LT; /UserControl.Template>
错误： 找不到资源名为MyStory。资源名称是区分大小写的。的
►的第二步：的消除触发在 IsMouseOver 属性并开始 MyStory 从code的后面。
＆LT; UserControl.Template＆GT;
＆LT;＆控件模板GT;
＆LT; BORDER X：NAME =brdBase了borderThickness =1BorderBrush =青色背景=黑的MouseEnter =brdBase_MouseEnter＆GT;
＆LT; Border.Resources＆GT;
＆LT;情节提要X：键=MyStory＆GT;
＆LT; ColorAnimationUsingKeyFrames Storyboard.TargetProperty =。（Border.BorderBrush）（SolidColorBrush.Color）Storyboard.TargetName =brdBase＆GT;
＆LT; SplineColorKeyFrame KeyTime =0：0：1VALUE ={绑定的RelativeSource = {的RelativeSource模式= FindAncestor，AncestorType = {X：类型本地：MyControl}}，路径= SpecialColor}/＆GT;
＆LT; / ColorAnimationUsingKeyFrames＆GT;
＆LT; /故事板＆GT;
＆LT; /Border.Resources>
＆LT; /边框＆GT;
＆LT; /控件模板＆GT;
＆LT; /UserControl.Template>
C＃code-背后：
私人无效brdBase_MouseEnter（对象发件人，MouseEventArgs E）
{
边境grdRoot =（境）this.Template.FindName（brdBase，这一点）;
故事板故事= grdRoot.Resources [MyStory]作为故事板; story.Begin（这一点，this.Template）;
}
►<青霉>步骤3：的溶液已经完成，但它不会在第一次工作。幸运的是，这个问题的解决方法。这足以把控件模板在风格。
（我需要其他触发类型比的EventTrigger ，必须包裹用户控件与元素控件模板）
更新：
有关使用的想法的ObjectDataProvider 失败。
- 的的ObjectDataProvider 的资源不能被用于提供故事板！错误报告是：
XamlParseException：设置属性System.Windows.Media.Animation.BeginStoryboard.Storyboard引发了异常。
的InnerException：的'System.Windows.Data.ObjectDataProvider'不是财产故事板的有效值。
- 的 AssociatedControl 的DP总是空。
下面是code：
＆LT; UserControl.Template＆GT;
＆LT;＆控件模板GT;
＆LT; ControlTemplate.Resources＆GT;
＆lt;局部：StoryboardFinder X：键=StoryboardFinder1AssociatedControl ={绑定的ElementName = brdBase}/＆GT;
＆LT; ObjectDataProvider的X：键=dataProvider中对象实例={StaticResource的StoryboardFinder1}方法名=搜索＆GT;
＆LT; ObjectDataProvider.MethodParameters＆GT;
＆LT; SYS：字符串＆GT; MyStory＆LT; / SYS：字符串＆GT;
＆LT; /ObjectDataProvider.MethodParameters>
＆LT; / ObjectDataProvider的＆GT;
＆LT; /ControlTemplate.Resources> ＆LT; BORDER X：NAME =brdBase了borderThickness =1BorderBrush =青色背景=黑＆GT;
＆LT; Border.Resources＆GT;
＆LT;情节提要X：键=MyStory＆GT;
＆LT; ColorAnimationUsingKeyFrames Storyboard.TargetProperty =。（Border.BorderBrush）（SolidColorBrush.Color）Storyboard.TargetName =brdBase＆GT;
＆LT; SplineColorKeyFrame KeyTime =0：0：1VALUE ={绑定的RelativeSource = {的RelativeSource模式= FindAncestor，AncestorType = {X：类型本地：MyControl}}，路径= SpecialColor}/＆GT;
＆LT; / ColorAnimationUsingKeyFrames＆GT;
＆LT; /故事板＆GT;
＆LT; /Border.Resources>
...
＆LT; /边框＆GT; ＆LT; ControlTemplate.Triggers＆GT;
＆LT;触发SOURCENAME =brdBase属性=IsMouseOverVALUE =真＆GT;
＆LT; Trigger.EnterActions＆GT;
＆LT; BeginStoryboard故事板={StaticResource的dataProvider中}/＆GT;
＆LT; /Trigger.EnterActions>
＆LT; /触发＆GT;
＆LT; /ControlTemplate.Triggers>
＆LT; /控件模板＆GT;
＆LT; /UserControl.Template>
该StoryboardFinder类：
公共类StoryboardFinder：DependencyObject的
{
＃区域________________________________________ AssociatedControl 公共控制AssociatedControl
{
{返回（控制）的GetValue（AssociatedControlProperty）; }
集合{的SetValue（AssociatedControlProperty，值）; }
} 公共静态只读的DependencyProperty AssociatedControlProperty =
DependencyProperty.Register（AssociatedControl
typeof运算（控制），
typeof运算（StoryboardFinder）
新FrameworkPropertyMetadata（NULL，FrameworkPropertyMetadataOptions.None））; #endregion 公共故事板取景器（字符串资源名称）
{
//
//相关的控制总是空:(
//
返回新故事板（）;
}
}
解决方案
如果这是什么code是真的？
＆LT;用户控件X：类=MyApp.MyControl
...
的xmlns：I =CLR的命名空间：System.Windows.Interactivity;装配= System.Windows.Interactivity
的xmlns：L =CLR的命名空间：MyApp的
的DataContext ={绑定的RelativeSource = {的RelativeSource模式=自}}＆GT; ＆LT; UserControl.Resources＆GT;
＆LT;风格的TargetType ={X：I型：MyControl}＆GT;
＆LT; setter属性=模板＆GT;
＆LT; Setter.Value＆GT;
＆LT;的ControlTemplate的TargetType ={X：I型：MyControl}＆GT;
＆LT; BORDER X：NAME =brdBase了borderThickness =1BorderBrush =青色背景=黑＆GT;
＆LT; Border.Resources＆GT;
＆LT;情节提要X：键=MyStory＆GT;
＆LT; ColorAnimationUsingKeyFrames Storyboard.TargetProperty =。（Border.BorderBrush）（SolidColorBrush.Color）Storyboard.TargetName =brdBase＆GT;
＆LT; SplineColorKeyFrame KeyTime =0：0：1VALUE ={绑定的RelativeSource = {的RelativeSource模式= FindAncestor，AncestorType = {X：I型：MyControl}}，路径= SpecialColor}/＆GT;
＆LT; / ColorAnimationUsingKeyFrames＆GT;
＆LT; /故事板＆GT;
＆LT; /Border.Resources> ＆LT; I：Interaction.Triggers＆GT;
＆LT; L：InteractiveTrigger属性=IsMouseOverVALUE =真＆GT;
＆LT; L：InteractiveTrigger.CommonActions＆GT;
＆LT; BeginStoryboard故事板={StaticResource的MyStory}/＆GT;
＆LT; / L：InteractiveTrigger.CommonActions＆GT;
＆LT; / L：InteractiveTrigger＆GT;
＆LT; /我：Interaction.Triggers＆GT;
＆LT; /边框＆GT;
＆LT; /控件模板＆GT;
＆LT; /Setter.Value>
＆LT; /二传手＆GT;
＆LT; /样式和GT;
＆LT; /UserControl.Resources>
＆LT; /用户控件＆GT;
如果是这样，我可以让 IsMouseOver 属性触发器...
我很高兴地说这是一个工作code :)我只能在＆LT使用标记。这是限制。于是我开始思考这样的想法：如果我能有什么自定义触发可在的EventTrigger ; Border.Triggers＆GT; FrameworkElement.Triggers 范围工作？这里是code：
使用系统;
使用System.Collections.Generic;
使用System.ComponentModel;
使用System.Windows;
使用System.Windows.Interactivity;
用System.Windows.Media.Animation;命名空间TriggerTest
{
///＆LT;总结＆gt;
/// InteractiveTrigger是可以用作System.Windows.Trigger但在System.Windows.Interactivity触发。
///＆LT;＆款GT;
///注意：既不是`EnterActions`也不`ExitActions`在这个类。在`CommonActions`可以用来代替`EnterActions`。
///此外，可以使用的`Actions`属性是类型System.Windows.Interactivity.TriggerAction的。
///＆LT; /对＆GT;
///＆LT;＆款GT; ＆LT; /对＆GT;
///＆LT;＆款GT;
///只有一种在System.Windows.Interactivity触发器（即的EventTrigger）的。所以，你可以使用此命名空间中的以下触发器：
///＆LT;＆款GT 1- InteractiveTrigger：触发＆LT; /对＆GT;
///＆所述;对将2- InteractiveMultiTrigger：MultiTrigger＆下; /段＆GT;
///＆所述;段＆将3- InteractiveDataTrigger：DataTrigger＆下; /段＆GT;
///＆所述;对将4- InteractiveMultiDataTrigger：MultiDataTrigger＆下; /段＆GT;
///＆LT; /对＆GT;
///＆LT; /总结＆gt;
公共类InteractiveTrigger：TriggerBase＆LT;＆FrameworkElement的GT;
{
＃区域___________________________________________________________________________________属性 ＃区域________________________________________值 ///＆LT;总结＆gt;
/// [包装属性ValueProperty]
///＆LT;＆款GT;
///获取或设置为与元件的特性值进行比较的值。比较结果为基准相等性检查。
///＆LT; /对＆GT;
///＆LT; /总结＆gt;
公共对象值
{
{返回（对象）的GetValue（ValueProperty）; }
集合{的SetValue（ValueProperty，值）; }
} 公共静态只读的DependencyProperty ValueProperty =
DependencyProperty.Register（值，
typeof运算（对象），
typeof运算（InteractiveTrigger）
新FrameworkPropertyMetadata（NULL，FrameworkPropertyMetadataOptions.None，OnValuePropertyChanged））; 私有静态无效OnValuePropertyChanged（DependencyObject的发件人，DependencyPropertyChangedEventArgs E）
{
InteractiveTrigger例如=发件人为InteractiveTrigger; 如果（比如！= NULL）
{
如果（instance.CanFire）
instance.Fire（）;
}
} #endregion
///＆LT;总结＆gt;
///获取或设置与导致要施加的关联的制定者的属性的对象的名称。
///＆LT; /总结＆gt;
公共字符串SOURCENAME
{
得到;
组;
} ///＆LT;总结＆gt;
///获取或设置返回与此trigger.Value属性比较值的属性。比较结果为基准相等性检查。
///＆LT; /总结＆gt;
公共属性的DependencyProperty
{
得到;
组;
} ///＆LT;总结＆gt;
///获取或设置System.Windows.Setter对象，描述当在触发对象成为激活的属性值以应用的集合。
///＆LT; /总结＆gt;
公开名单＆LT;二传手＆GT;塞特斯
{
得到;
组;
} ///＆LT;总结＆gt;
///获取或设置System.Windows.TriggerAction的集合对象时，该触发器对象被激活申请。
///＆LT; /总结＆gt;
公开名单＆LT; System.Windows.TriggerAction＆GT; CommonActions
{
得到;
组;
} ///＆LT;总结＆gt;
///获取指示该触发器是否可以主动申请制定者和行动的价值。
///＆LT; /总结＆gt;
私人布尔CanFire
{
得到
{
如果（this.AssociatedObject == NULL）
{
返回false;
}
其他
{
反对associatedValue; 如果（string.IsNullOrEmpty（SOURCENAME））
associatedValue = this.AssociatedObject.GetValue（物业）;
其他
associatedValue =（this.AssociatedObject.FindName（SOURCENAME）为DependencyObject的）.GetValue（物业）; 类型转换器的TypeConverter = TypeDescriptor.GetConverter（Property.PropertyType）;
对象realValue = typeConverter.ConvertFromString（Value.ToString（））; 返回associatedValue.Equals（realValue）;
}
}
} #endregion
＃区域___________________________________________________________________________________方法 ///＆LT;总结＆gt;
///触发（激活）当前触发设置二传手值和调用的所有操作。
///＆LT; /总结＆gt;
私人无效火（）
{
//
//设置setter方法值及其相关属性..
//
的foreach（在二传手二传手二传手）
{
如果（string.IsNullOrEmpty（setter.TargetName））
this.AssociatedObject.SetValue（setter.Property，setter.Value）;
其他
（this.AssociatedObject.FindName（setter.TargetName）为DependencyObject的）.SetValue（setter.Property，setter.Value）;
} //
//射击动作..
//
的foreach（在CommonActions System.Windows.TriggerAction动作）
{
键入操作类型= action.GetType（）; 如果（操作类型== typeof运算（BeginStoryboard））
{
（动作如BeginStoryboard）.Storyboard.Begin（）;
}
其他
抛出新NotImplementedException（）;
} this.InvokeActions（NULL）;
} #endregion
＃区域___________________________________________________________________________________活动 公共InteractiveTrigger（）
{
塞特斯=新的List＆LT;二传手＆GT;（）;
CommonActions =新的List＆LT; System.Windows.TriggerAction＆GT;（）;
} 保护覆盖无效OnAttached（）
{
base.OnAttached（）; 如果（属性！= NULL）
{
反对propertyAssociatedObject; 如果（string.IsNullOrEmpty（SOURCENAME））
propertyAssociatedObject = this.AssociatedObject;
其他
propertyAssociatedObject = this.AssociatedObject.FindName（SOURCENAME）; //
//添加属性改变监听器属性相关联的对象..
//
DependencyPropertyDescriptor dpDescriptor = DependencyPropertyDescriptor.FromProperty（房产，propertyAssociatedObject.GetType（））;
dpDescriptor.AddValueChanged（propertyAssociatedObject，PropertyListener_ValueChanged）;
}
} 保护覆盖无效OnDetaching（）
{
base.OnDetaching（）; 如果（属性！= NULL）
{
反对propertyAssociatedObject; 如果（string.IsNullOrEmpty（SOURCENAME））
propertyAssociatedObject = this.AssociatedObject;
其他
propertyAssociatedObject = this.AssociatedObject.FindName（SOURCENAME）; //
//删除previously添加的属性从相关对象改变监听器..
//
DependencyPropertyDescriptor dpDescriptor = DependencyPropertyDescriptor.FromProperty（房产，propertyAssociatedObject.GetType（））;
dpDescriptor.RemoveValueChanged（propertyAssociatedObject，PropertyListener_ValueChanged）;
}
} 私人无效PropertyListener_ValueChanged（对象发件人，EventArgs的发送）
{
如果（CanFire）
火（）;
} #endregion
}
}
我还创建了其他触发类型（即 InteractiveMultiTrigger ， InteractiveDataTrigger ， InteractiveMultiDataTrigger ），以及一些更多的操作，这使得有可能有一个条件和多条件EventTriggers。我会公布所有这些，如果你专业的人证实了这一解决方案。
感谢您的关注！
Consider this code:
<UserControl x:Class="MyApp.MyControl"
...
xmlns:local="clr-namespace:MyApp"
DataContext="{Binding RelativeSource={RelativeSource Mode=Self}}">
<UserControl.Template>
<ControlTemplate>
<ControlTemplate.Resources>
<Storyboard x:Key="MyStory">
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" Storyboard.TargetName="brdBase">
<SplineColorKeyFrame KeyTime="0:0:1" Value="Red"/>
</ColorAnimationUsingKeyFrames>
</Storyboard>
</ControlTemplate.Resources>
<Border x:Name="brdBase" BorderThickness="1" BorderBrush="Cyan" Background="Black">
...
</Border>
<ControlTemplate.Triggers>
<Trigger SourceName="brdBase" Property="IsMouseOver" Value="True">
<Trigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource MyStory}"/>
</Trigger.EnterActions>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</UserControl.Template>
</UserControl>
The above code works with no problem. Now, I wanna bind key-frame value of MyStory to a DP (named SpecialColor) of this user-control like so:
<Storyboard x:Key="MyStory">
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" Storyboard.TargetName="brdBase">
<SplineColorKeyFrame KeyTime="0:0:1" Value="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:MyControl}}, Path=SpecialColor}"/>
</ColorAnimationUsingKeyFrames>
</Storyboard>
which makes an error:
Cannot freeze this Storyboard timeline tree for use across threads.
It's possible to do this using code behind. But how can I do it in XAML only?
Code-Behind Aided Solution:
►Step 1: Putting the MyStory storyboard into the brdBase resources.
<UserControl.Template>
<ControlTemplate>
<Border x:Name="brdBase" BorderThickness="1" BorderBrush="Cyan" Background="Black">
<Border.Resources>
<Storyboard x:Key="MyStory">
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" Storyboard.TargetName="brdBase">
<SplineColorKeyFrame KeyTime="0:0:1" Value="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:MyControl}}, Path=SpecialColor}"/>
</ColorAnimationUsingKeyFrames>
</Storyboard>
</Border.Resources>
...
</Border>
<ControlTemplate.Triggers>
<Trigger SourceName="brdBase" Property="IsMouseOver" Value="True">
<Trigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource MyStory}"/>
</Trigger.EnterActions>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</UserControl.Template>
Error: Cannot find resource named 'MyStory'. Resource names are case sensitive.
►Step 2: Eliminating Trigger on IsMouseOver property and begin the MyStory from code behind.
<UserControl.Template>
<ControlTemplate>
<Border x:Name="brdBase" BorderThickness="1" BorderBrush="Cyan" Background="Black" MouseEnter="brdBase_MouseEnter">
<Border.Resources>
<Storyboard x:Key="MyStory">
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" Storyboard.TargetName="brdBase">
<SplineColorKeyFrame KeyTime="0:0:1" Value="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:MyControl}}, Path=SpecialColor}"/>
</ColorAnimationUsingKeyFrames>
</Storyboard>
</Border.Resources>
</Border>
</ControlTemplate>
</UserControl.Template>
C# Code-Behind:
private void brdBase_MouseEnter(object sender, MouseEventArgs e)
{
Border grdRoot = (Border)this.Template.FindName("brdBase", this);
Storyboard story = grdRoot.Resources["MyStory"] as Storyboard;
story.Begin(this, this.Template);
}
►Step 3: The solution is already done, but it doesn't work at the first time. Fortunately, there is a workaround for this issue. It's enough to put the ControlTemplate in a Style.
(I need other Trigger types than EventTrigger and must wrap the UserControl elements with the ControlTemplate.)
Update:
The idea about using ObjectDataProvider failed.
- An ObjectDataProvider resource cannot be used to provide a storyboard!!! The error report is:
- XamlParseException: Set property 'System.Windows.Media.Animation.BeginStoryboard.Storyboard' threw an exception.
- InnerException: 'System.Windows.Data.ObjectDataProvider' is not a valid value for property 'Storyboard'.
- The AssociatedControl DP is always null.
Here is the code:
<UserControl.Template>
<ControlTemplate>
<ControlTemplate.Resources>
<local:StoryboardFinder x:Key="StoryboardFinder1" AssociatedControl="{Binding ElementName=brdBase}"/>
<ObjectDataProvider x:Key="dataProvider" ObjectInstance="{StaticResource StoryboardFinder1}" MethodName="Finder">
<ObjectDataProvider.MethodParameters>
<sys:String>MyStory</sys:String>
</ObjectDataProvider.MethodParameters>
</ObjectDataProvider>
</ControlTemplate.Resources>
<Border x:Name="brdBase" BorderThickness="1" BorderBrush="Cyan" Background="Black">
<Border.Resources>
<Storyboard x:Key="MyStory">
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" Storyboard.TargetName="brdBase">
<SplineColorKeyFrame KeyTime="0:0:1" Value="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:MyControl}}, Path=SpecialColor}"/>
</ColorAnimationUsingKeyFrames>
</Storyboard>
</Border.Resources>
...
</Border>
<ControlTemplate.Triggers>
<Trigger SourceName="brdBase" Property="IsMouseOver" Value="True">
<Trigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource dataProvider}"/>
</Trigger.EnterActions>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</UserControl.Template>
The StoryboardFinder class:
public class StoryboardFinder : DependencyObject
{
#region ________________________________________ AssociatedControl
public Control AssociatedControl
{
get { return (Control)GetValue(AssociatedControlProperty); }
set { SetValue(AssociatedControlProperty, value); }
}
public static readonly DependencyProperty AssociatedControlProperty =
DependencyProperty.Register("AssociatedControl",
typeof(Control),
typeof(StoryboardFinder),
new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.None));
#endregion
public Storyboard Finder(string resourceName)
{
//
// Associated control is always null :(
//
return new Storyboard();
}
}
解决方案
What if this code was true?
<UserControl x:Class="MyApp.MyControl"
...
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:l="clr-namespace:MyApp"
DataContext="{Binding RelativeSource={RelativeSource Mode=Self}}">
<UserControl.Resources>
<Style TargetType="{x:Type l:MyControl}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type l:MyControl}">
<Border x:Name="brdBase" BorderThickness="1" BorderBrush="Cyan" Background="Black">
<Border.Resources>
<Storyboard x:Key="MyStory">
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" Storyboard.TargetName="brdBase">
<SplineColorKeyFrame KeyTime="0:0:1" Value="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type l:MyControl}}, Path=SpecialColor}"/>
</ColorAnimationUsingKeyFrames>
</Storyboard>
</Border.Resources>
<i:Interaction.Triggers>
<l:InteractiveTrigger Property="IsMouseOver" Value="True">
<l:InteractiveTrigger.CommonActions>
<BeginStoryboard Storyboard="{StaticResource MyStory}"/>
</l:InteractiveTrigger.CommonActions>
</l:InteractiveTrigger>
</i:Interaction.Triggers>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</UserControl.Resources>
</UserControl>
If so, I could have a Trigger on IsMouseOver property...
I'm glad to say it's a working code :) I could only use EventTrigger in <Border.Triggers> tag. It was the limitation. So I started thinking about this idea: What if I could have a custom trigger which can work in FrameworkElement.Triggers scope? Here is the code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows;
using System.Windows.Interactivity;
using System.Windows.Media.Animation;
namespace TriggerTest
{
/// <summary>
/// InteractiveTrigger is a trigger that can be used as the System.Windows.Trigger but in the System.Windows.Interactivity.
/// <para>
/// Note: There is neither `EnterActions` nor `ExitActions` in this class. The `CommonActions` can be used instead of `EnterActions`.
/// Also, the `Actions` property which is of type System.Windows.Interactivity.TriggerAction can be used.
/// </para>
/// <para> </para>
/// <para>
/// There is only one kind of triggers (i.e. EventTrigger) in the System.Windows.Interactivity. So you can use the following triggers in this namespace:
/// <para>1- InteractiveTrigger : Trigger</para>
/// <para>2- InteractiveMultiTrigger : MultiTrigger</para>
/// <para>3- InteractiveDataTrigger : DataTrigger</para>
/// <para>4- InteractiveMultiDataTrigger : MultiDataTrigger</para>
/// </para>
/// </summary>
public class InteractiveTrigger : TriggerBase<FrameworkElement>
{
#region ___________________________________________________________________________________ Properties
#region ________________________________________ Value
/// <summary>
/// [Wrapper property for ValueProperty]
/// <para>
/// Gets or sets the value to be compared with the property value of the element. The comparison is a reference equality check.
/// </para>
/// </summary>
public object Value
{
get { return (object)GetValue(ValueProperty); }
set { SetValue(ValueProperty, value); }
}
public static readonly DependencyProperty ValueProperty =
DependencyProperty.Register("Value",
typeof(object),
typeof(InteractiveTrigger),
new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.None, OnValuePropertyChanged));
private static void OnValuePropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
InteractiveTrigger instance = sender as InteractiveTrigger;
if (instance != null)
{
if (instance.CanFire)
instance.Fire();
}
}
#endregion
/// <summary>
/// Gets or sets the name of the object with the property that causes the associated setters to be applied.
/// </summary>
public string SourceName
{
get;
set;
}
/// <summary>
/// Gets or sets the property that returns the value that is compared with this trigger.Value property. The comparison is a reference equality check.
/// </summary>
public DependencyProperty Property
{
get;
set;
}
/// <summary>
/// Gets or sets a collection of System.Windows.Setter objects, which describe the property values to apply when the trigger object becomes active.
/// </summary>
public List<Setter> Setters
{
get;
set;
}
/// <summary>
/// Gets or sets the collection of System.Windows.TriggerAction objects to apply when this trigger object becomes active.
/// </summary>
public List<System.Windows.TriggerAction> CommonActions
{
get;
set;
}
/// <summary>
/// Gets a value indicating whether this trigger can be active to apply setters and actions.
/// </summary>
private bool CanFire
{
get
{
if (this.AssociatedObject == null)
{
return false;
}
else
{
object associatedValue;
if (string.IsNullOrEmpty(SourceName))
associatedValue = this.AssociatedObject.GetValue(Property);
else
associatedValue = (this.AssociatedObject.FindName(SourceName) as DependencyObject).GetValue(Property);
TypeConverter typeConverter = TypeDescriptor.GetConverter(Property.PropertyType);
object realValue = typeConverter.ConvertFromString(Value.ToString());
return associatedValue.Equals(realValue);
}
}
}
#endregion
#region ___________________________________________________________________________________ Methods
/// <summary>
/// Fires (activates) current trigger by setting setter values and invoking all actions.
/// </summary>
private void Fire()
{
//
// Setting setters values to their associated properties..
//
foreach (Setter setter in Setters)
{
if (string.IsNullOrEmpty(setter.TargetName))
this.AssociatedObject.SetValue(setter.Property, setter.Value);
else
(this.AssociatedObject.FindName(setter.TargetName) as DependencyObject).SetValue(setter.Property, setter.Value);
}
//
// Firing actions..
//
foreach (System.Windows.TriggerAction action in CommonActions)
{
Type actionType = action.GetType();
if (actionType == typeof(BeginStoryboard))
{
(action as BeginStoryboard).Storyboard.Begin();
}
else
throw new NotImplementedException();
}
this.InvokeActions(null);
}
#endregion
#region ___________________________________________________________________________________ Events
public InteractiveTrigger()
{
Setters = new List<Setter>();
CommonActions = new List<System.Windows.TriggerAction>();
}
protected override void OnAttached()
{
base.OnAttached();
if (Property != null)
{
object propertyAssociatedObject;
if (string.IsNullOrEmpty(SourceName))
propertyAssociatedObject = this.AssociatedObject;
else
propertyAssociatedObject = this.AssociatedObject.FindName(SourceName);
//
// Adding a property changed listener to the property associated-object..
//
DependencyPropertyDescriptor dpDescriptor = DependencyPropertyDescriptor.FromProperty(Property, propertyAssociatedObject.GetType());
dpDescriptor.AddValueChanged(propertyAssociatedObject, PropertyListener_ValueChanged);
}
}
protected override void OnDetaching()
{
base.OnDetaching();
if (Property != null)
{
object propertyAssociatedObject;
if (string.IsNullOrEmpty(SourceName))
propertyAssociatedObject = this.AssociatedObject;
else
propertyAssociatedObject = this.AssociatedObject.FindName(SourceName);
//
// Removing previously added property changed listener from the associated-object..
//
DependencyPropertyDescriptor dpDescriptor = DependencyPropertyDescriptor.FromProperty(Property, propertyAssociatedObject.GetType());
dpDescriptor.RemoveValueChanged(propertyAssociatedObject, PropertyListener_ValueChanged);
}
}
private void PropertyListener_ValueChanged(object sender, EventArgs e)
{
if (CanFire)
Fire();
}
#endregion
}
}
I've also created other trigger types (i.e. InteractiveMultiTrigger, InteractiveDataTrigger, InteractiveMultiDataTrigger) as well as some more actions which makes it possible to have a conditional and multi-conditional EventTriggers. I'll publish them all if you professional guys confirm this solution.
Thanks for your attention!
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