WPF动画：绑定到＆QUOT;到＆QUOT;动画故事板属性 [英] WPF animation: binding to the "To" attribute of storyboard animation
问题描述
我想创建一个按钮，其功能类似于在iPhone上的幻灯片按钮。我有一个调节按钮的位置和宽度的动画，但我想这些值是基于在控制使用的文本。目前，他们很难codeD。
I'm trying to create a button that behaves similarly to the "slide" button on the iPhone. I have an animation that adjusts the position and width of the button, but I want these values to be based on the text used in the control. Currently, they're hardcoded.
这是我的工作XAML，到目前为止：
Here's my working XAML, so far:
<CheckBox x:Class="Smt.Controls.SlideCheckBox"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:Smt.Controls"
xmlns:System.Windows="clr-namespace:System.Windows;assembly=PresentationCore"
Name="SliderCheckBox"
mc:Ignorable="d">
<CheckBox.Resources>
<System.Windows:Duration x:Key="AnimationTime">0:0:0.2</System.Windows:Duration>
<Storyboard x:Key="OnChecking">
<DoubleAnimation Storyboard.TargetName="CheckButton"
Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(TranslateTransform.X)"
Duration="{StaticResource AnimationTime}"
To="40" />
<DoubleAnimation Storyboard.TargetName="CheckButton"
Storyboard.TargetProperty="(Button.Width)"
Duration="{StaticResource AnimationTime}"
To="41" />
</Storyboard>
<Storyboard x:Key="OnUnchecking">
<DoubleAnimation Storyboard.TargetName="CheckButton"
Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(TranslateTransform.X)"
Duration="{StaticResource AnimationTime}"
To="0" />
<DoubleAnimation Storyboard.TargetName="CheckButton"
Storyboard.TargetProperty="(Button.Width)"
Duration="{StaticResource AnimationTime}"
To="40" />
</Storyboard>
<Style x:Key="SlideCheckBoxStyle"
TargetType="{x:Type local:SlideCheckBox}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:SlideCheckBox}">
<Canvas>
<ContentPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
Content="{TemplateBinding Content}"
ContentTemplate="{TemplateBinding ContentTemplate}"
RecognizesAccessKey="True"
VerticalAlignment="Center"
HorizontalAlignment="Center" />
<Canvas>
<!--Background-->
<Rectangle Width="{Binding ElementName=ButtonText, Path=ActualWidth}"
Height="{Binding ElementName=ButtonText, Path=ActualHeight}"
Fill="LightBlue" />
</Canvas>
<Canvas>
<!--Button-->
<Button Width="{Binding ElementName=CheckedText, Path=ActualWidth}"
Height="{Binding ElementName=ButtonText, Path=ActualHeight}"
Name="CheckButton"
Command="{x:Static local:SlideCheckBox.SlideCheckBoxClicked}">
<Button.RenderTransform>
<TransformGroup>
<TranslateTransform />
</TransformGroup>
</Button.RenderTransform>
</Button>
</Canvas>
<Canvas>
<!--Text-->
<StackPanel Name="ButtonText"
Orientation="Horizontal"
IsHitTestVisible="False">
<Grid Name="CheckedText">
<Label Margin="7 0"
Content="{Binding RelativeSource={RelativeSource AncestorType={x:Type local:SlideCheckBox}}, Path=CheckedText}" />
</Grid>
<Grid Name="UncheckedText"
HorizontalAlignment="Right">
<Label Margin="7 0"
Content="{Binding RelativeSource={RelativeSource AncestorType={x:Type local:SlideCheckBox}}, Path=UncheckedText}" />
</Grid>
</StackPanel>
</Canvas>
</Canvas>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked"
Value="True">
<Trigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource OnChecking}" />
</Trigger.EnterActions>
<Trigger.ExitActions>
<BeginStoryboard Storyboard="{StaticResource OnUnchecking}" />
</Trigger.ExitActions>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</CheckBox.Resources>
<CheckBox.CommandBindings>
<CommandBinding Command="{x:Static local:SlideCheckBox.SlideCheckBoxClicked}"
Executed="OnSlideCheckBoxClicked" />
</CheckBox.CommandBindings>
</CheckBox>
和背后的code：
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
namespace Smt.Controls
{
public partial class SlideCheckBox : CheckBox
{
public SlideCheckBox()
{
InitializeComponent();
Loaded += OnLoaded;
}
public static readonly DependencyProperty CheckedTextProperty = DependencyProperty.Register("CheckedText", typeof(string), typeof(SlideCheckBox), new PropertyMetadata("Checked Text"));
public string CheckedText
{
get { return (string)GetValue(CheckedTextProperty); }
set { SetValue(CheckedTextProperty, value); }
}
public static readonly DependencyProperty UncheckedTextProperty = DependencyProperty.Register("UncheckedText", typeof(string), typeof(SlideCheckBox), new PropertyMetadata("Unchecked Text"));
public string UncheckedText
{
get { return (string)GetValue(UncheckedTextProperty); }
set { SetValue(UncheckedTextProperty, value); }
}
public static readonly RoutedCommand SlideCheckBoxClicked = new RoutedCommand();
void OnLoaded(object sender, RoutedEventArgs e)
{
Style style = TryFindResource("SlideCheckBoxStyle") as Style;
if (!ReferenceEquals(style, null))
{
Style = style;
}
}
void OnSlideCheckBoxClicked(object sender, ExecutedRoutedEventArgs e)
{
IsChecked = !IsChecked;
}
}
}
问题是当我尝试在DoubleAnimations到属性绑定到文本的实际宽度，同我在ControlTemplate中正在做。如果我值绑定到在所述的ControlTemplate的元素的ActualWidth的，控制出来作为一个空白复选框（我的基类）。然而，我结合在的ControlTemplate本身相同ActualWidths没有任何问题。只是似乎是有一个问题，它CheckBox.Resources。
The problem comes when I try to bind the "To" attribute in the DoubleAnimations to the actual width of the text, the same as I'm doing in the ControlTemplate. If I bind the values to an ActualWidth of an element in the ControlTemplate, the control comes up as a blank checkbox (my base class). However, I'm binding to the same ActualWidths in the ControlTemplate itself without any problems. Just seems to be the CheckBox.Resources that have a problem with it.
有关实例，以下将打破它
For instance, the following will break it:
<DoubleAnimation Storyboard.TargetName="CheckButton"
Storyboard.TargetProperty="(Button.Width)"
Duration="{StaticResource AnimationTime}"
To="{Binding ElementName=CheckedText, Path=ActualWidth}" />
我不知道这是否是因为它试图绑定到一个不存在，直到渲染过程完成后的值，或者如果它是别的东西。任何人有这种动画结合的经验吗？
I don't know whether this is because it's trying to bind to a value that doesn't exist until a render pass is done, or if it's something else. Anyone have any experience with this sort of animation binding?
推荐答案
我已经在类似的情况下控件模板地方我一直想绑定到属性值（而不是硬编码），我终于找到了解决办法。
I've had similar situations in ControlTemplates where I've wanted to bind the "To" attribute to a value (rather than hard-coding it), and I finally found a solution.
边注：如果你周围挖在网络上，你会发现<一个href=\"http://stackoverflow.com/questions/5154205/actualwidth-as-value-of-from-wpf-animation\">examples人们能够使用的数据为从或要的属性绑定。然而，在这些例子的故事板不是在一个样式或控件模板。如果你的故事板是一个样式或控件模板，你将不得不使用不同的方法，像这样的解决方案。
Quick side note: If you dig around on the web you'll find examples of people being able to use data binding for the "From" or "To" properties. However, in those examples the Storyboards are not in a Style or ControlTemplate. If your Storyboard is in a Style or ControlTemplate, you'll have to use a different approach, such as this solution.
该解决方案得到周围的可冻结问题，因为它只是动画从0到1的double值它与巧妙地利用Tag属性和乘法转换器。您可以使用multibinding绑定到两者所需的财产，你的秤（标签），其中获得相乘。基本想法是，你的标记值就是你什么动画，其价值的行为就像一个规模（从0到1）把你想要的属性值设置为满刻度一旦你的动画标记为1。
This solution gets around the freezable issue because it simply animates a double value from 0 to 1. It works with a clever use of the Tag property and a Multiply converter. You use a multibinding to bind to both a desired property and your "scale" (the Tag), which get multiplied together. Basically the idea is that your Tag value is what you animate, and its value acts like a "scale" (from 0 to 1) bringing your desired attribute value to "full scale" once you've animated the Tag to 1.
您可以在行动<一看到这href=\"http://www.$c$cproject.com/Articles/248112/Templating-WPF-Expander-Control\">here.它的关键是这样的：
You can see this in action here. The crux of it is this:
<local:MultiplyConverter x:Key="multiplyConverter" />
<ControlTemplate x:Key="RevealExpanderTemp" TargetType="{x:Type Expander}">
<!-- (other stuff here...) -->
<ScrollViewer x:Name="ExpanderContentScrollView">
<!-- ** BEGIN IMPORTANT PART #1 ... -->
<ScrollViewer.Tag>
<sys:Double>0.0</sys:Double>
</ScrollViewer.Tag>
<ScrollViewer.Height>
<MultiBinding Converter="{StaticResource multiplyConverter}">
<Binding Path="ActualHeight" ElementName="ExpanderContent"/>
<Binding Path="Tag" RelativeSource="{RelativeSource Self}" />
</MultiBinding>
</ScrollViewer.Height>
<!-- ...end important part #1. -->
<ContentPresenter x:Name="ExpanderContent" ContentSource="Content"/>
</ScrollViewer>
<ControlTemplate.Triggers>
<Trigger Property="IsExpanded" Value="True">
<Trigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<!-- ** BEGIN IMPORTANT PART #2 (make TargetProperty 'Tag') ... -->
<DoubleAnimation Storyboard.TargetName="ExpanderContentScrollView"
Storyboard.TargetProperty="Tag"
To="1"
Duration="0:0:0.4"/>
<!-- ...end important part #2 -->
</Storyboard>
</Trigger.EnterActions>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
使用这个值转换器：
public class MultiplyConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
double result = 1.0;
for (int i = 0; i < values.Length; i++)
{
if (values[i] is double)
result *= (double)values[i];
}
return result;
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
throw new Exception("Not implemented");
}
}
这篇关于WPF动画：绑定到＆QUOT;到＆QUOT;动画故事板属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
