使用依赖对象为彩色动画WP8

Question

我使用一个按钮，我已经塑造了它，在它的控制模板。我还在controlTemplate中添加了一个故事板。storyboard改变了我的controlTemplate中元素的边界。我从后面的代码访问这个并激活它，问题是当我在手机上这样做时有延迟。我在MVVM结构之后构建了我的代码，我的视图是:

 <Button x:Name="Button1" BorderThickness="0" BorderBrush="Transparent">
        <Button.Template>
            <ControlTemplate x:Name="Control">
                <Path x:Name="Control2" Style="{StaticResource style_ColorButton}" Data="{Binding Data}" Fill="{StaticResource Background}">
                    <Path.Resources>
                        <Storyboard x:Name="StoryBoard1">
                            <ColorAnimation Storyboard.TargetName="Control2" Storyboard.TargetProperty="(Stroke).(SolidColorBrush.Color)" To="Blue" Duration="0"/>
                        </Storyboard>
                    </Path.Resources>
                </Path>
            </ControlTemplate> 
        </Button.Template>

以及ViewModel中我激活storyboard的部分:

   foreach (UIElement x in ElementsAtPoint)
        {
            f = x as FrameworkElement;
            if (f is Path)
            {
                try { 
                h = f as Path;
                Storyboard sb = h.Resources["StoryBoard1"] as Storyboard;
                sb.Begin();
                    }
                catch
                {
                }
                break;
            }
        }

我读到一个可以使用依赖对象的动画，但我不确定它是如何工作的，或者如果它将工作，但任何帮助尝试实现依赖对象的动画将是感激的。

Answer 1

我建议使用VisualStates来完成您正在寻找的功能。我修改了一个按钮的样式，为MouseOver VisualState添加了一个故事，然后为按钮添加了MouseEnter和MouseLeave的事件侦听器。当您触摸设备并将手指拖到一个元素上，然后再将其拖走时，就会触发这些事件。您可以修改下面的代码来检查是否正在拖动某些内容。你也可以看看拖放功能。

使用下列样式

<Style x:Key="ButtonStyle" TargetType="Button">
    <Setter Property="Background" Value="Transparent"/>
    <Setter Property="BorderBrush" Value="{StaticResource PhoneForegroundBrush}"/>
    <Setter Property="Foreground" Value="{StaticResource PhoneForegroundBrush}"/>
    <Setter Property="BorderThickness" Value="{StaticResource PhoneBorderThickness}"/>
    <Setter Property="FontFamily" Value="{StaticResource PhoneFontFamilySemiBold}"/>
    <Setter Property="FontSize" Value="{StaticResource PhoneFontSizeMedium}"/>
    <Setter Property="Padding" Value="10,5,10,6"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="Button">
                <Grid Background="Transparent">
                    <VisualStateManager.VisualStateGroups>
                        <VisualStateGroup x:Name="CommonStates">
                            <VisualState x:Name="Normal"/>
                            <VisualState x:Name="MouseOver">
                                <Storyboard>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentContainer">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="White"/>
                                    </ObjectAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="ButtonBackground">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="Orange"/>
                                    </ObjectAnimationUsingKeyFrames>
                                </Storyboard>
                            </VisualState>
                            <VisualState x:Name="Pressed">
                                <Storyboard>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentContainer">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneButtonBasePressedForegroundBrush}"/>
                                    </ObjectAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="ButtonBackground">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneAccentBrush}"/>
                                    </ObjectAnimationUsingKeyFrames>
                                </Storyboard>
                            </VisualState>
                            <VisualState x:Name="Disabled">
                                <Storyboard>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentContainer">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneDisabledBrush}"/>
                                    </ObjectAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="ButtonBackground">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneDisabledBrush}"/>
                                    </ObjectAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="ButtonBackground">
                                        <DiscreteObjectKeyFrame KeyTime="0" Value="Transparent"/>
                                    </ObjectAnimationUsingKeyFrames>
                                </Storyboard>
                            </VisualState>
                        </VisualStateGroup>
                    </VisualStateManager.VisualStateGroups>
                    <Border x:Name="ButtonBackground" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" CornerRadius="0" Margin="{StaticResource PhoneTouchTargetOverhang}">
                        <ContentControl x:Name="ContentContainer" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" Foreground="{TemplateBinding Foreground}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
                    </Border>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

注意它有一个MouseOver VisualState。然后分配样式并订阅事件处理程序

<Button Content="Drag over me" Style="{StaticResource ButtonStyle}"  MouseEnter="OnButtonMouseEnter" MouseLeave="OnButtonMouseLeave"/>

并在事件处理程序中更改可视状态。

private void OnButtonMouseEnter(object sender, MouseEventArgs e)
{
    VisualStateManager.GoToState((Control)sender, "MouseOver", true);
}
private void OnButtonMouseLeave(object sender, MouseEventArgs e)
{
    VisualStateManager.GoToState((Control)sender, "Normal", true);
}

有了这个，当你点击并拖动你的手指在按钮上，它会变成橙色和白色的文字。