问题
I'm trying to create a "hover" effect when the user touches their finger down on to a button. When that happens I would like to background color of the button to change - and then when they move it away it changes back to the original color.
My code for the whole button is below
<Button x:Name="btnService" HorizontalAlignment="Center" Tag="{Binding Tag}" Command="{Binding DataContext.ConnectServiceCommand, ElementName=LayoutRoot}" CommandParameter="{Binding Tag}">
<Button.Template>
<ControlTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="350" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="64" />
<RowDefinition Height="10" />
</Grid.RowDefinitions>
<Border IsTapEnabled="True" CornerRadius="0" BorderBrush="Transparent" BorderThickness="0" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Grid.Row="0" Grid.Column="1">
<TextBlock Style="{StaticResource BodyTextBlockStyle}" VerticalAlignment="Center" HorizontalAlignment="Center" Foreground="{StaticResource accentForeground}" Text="{Binding NameUpper}" />
<Border.Style>
<Style TargetType="Border">
<Setter Property="Background" Value="{StaticResource bodyAccent}" />
</Style>
</Border.Style>
</Border>
</Grid>
</ControlTemplate>
</Button.Template>
</Button>
What I can't get working is the trigger as it doesn't seem to exist - I know normal WPF XAML apps have something like <Trigger Property="Border.IsMouseOver" Value="True">
Is there something like this for Windows Phone 8.1 apps?
Edit - Code added with VSManager
<Button x:Name="btnService" HorizontalAlignment="Center" Tag="{Binding Tag}" Command="{Binding DataContext.ConnectServiceCommand, ElementName=LayoutRoot}" CommandParameter="{Binding Tag}">
<Button.Template>
<ControlTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="350" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="64" />
<RowDefinition Height="10" />
</Grid.RowDefinitions>
<Border IsTapEnabled="True" CornerRadius="0" BorderBrush="Transparent" BorderThickness="0" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Grid.Row="0" Grid.Column="1">
<TextBlock Style="{StaticResource BodyTextBlockStyle}" VerticalAlignment="Center" HorizontalAlignment="Center" Foreground="{StaticResource accentForeground}" Text="{Binding NameUpper}" />
<Border.Style>
<Style TargetType="Border">
<Setter Property="Background" Value="{StaticResource bodyAccent}" />
</Style>
</Border.Style>
</Border>
</Grid>
</ControlTemplate>
</Button.Template>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Pressed">
<Storyboard>
<PointerDownThemeAnimation Storyboard.TargetName="Grid"/>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="Border">
<DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource bodyAccentAlt}"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
</Button>
回答1:
In the default Button style, there are some predefined visual states. In those visual states, you can define what happens when the Button is pressed
<Style x:Key="ButtonStyle1" TargetType="Button">
<Setter Property="Background" Value="Transparent"/>
<Setter Property="BorderBrush" Value="{ThemeResource PhoneForegroundBrush}"/>
<Setter Property="Foreground" Value="{ThemeResource PhoneForegroundBrush}"/>
<Setter Property="BorderThickness" Value="{ThemeResource PhoneBorderThickness}"/>
<Setter Property="FontFamily" Value="{ThemeResource PhoneFontFamilyNormal}"/>
<Setter Property="FontWeight" Value="{ThemeResource PhoneButtonFontWeight}"/>
<Setter Property="FontSize" Value="{ThemeResource TextStyleLargeFontSize}"/>
<Setter Property="Padding" Value="9.5,0"/>
<Setter Property="MinHeight" Value="{ThemeResource PhoneButtonMinHeight}"/>
<Setter Property="MinWidth" Value="{ThemeResource PhoneButtonMinWidth}"/>
<Setter Property="HorizontalAlignment" Value="Left"/>
<Setter Property="VerticalAlignment" Value="Center"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid x:Name="Grid" Background="Transparent">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualStateGroup.Transitions>
<VisualTransition From="Pressed" To="PointerOver">
<Storyboard>
<PointerUpThemeAnimation Storyboard.TargetName="Grid"/>
</Storyboard>
</VisualTransition>
<VisualTransition From="PointerOver" To="Normal">
<Storyboard>
<PointerUpThemeAnimation Storyboard.TargetName="Grid"/>
</Storyboard>
</VisualTransition>
<VisualTransition From="Pressed" To="Normal">
<Storyboard>
<PointerUpThemeAnimation Storyboard.TargetName="Grid"/>
</Storyboard>
</VisualTransition>
</VisualStateGroup.Transitions>
<VisualState x:Name="Normal"/>
<VisualState x:Name="PointerOver">
</VisualState>
<VisualState x:Name="Pressed">
<Storyboard>
<PointerDownThemeAnimation Storyboard.TargetName="Grid"/>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonPressedForegroundThemeBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="Border">
<DiscreteObjectKeyFrame KeyTime="0" Value="Yellow"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Disabled">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonDisabledForegroundThemeBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="Border">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonDisabledBorderThemeBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="Border">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonDisabledBackgroundThemeBrush}"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Border x:Name="Border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Margin="{ThemeResource PhoneTouchTargetOverhang}">
<ContentPresenter x:Name="ContentPresenter" AutomationProperties.AccessibilityView="Raw" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" Foreground="{TemplateBinding Foreground}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
</Border>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
In
<VisualState x:Name="Pressed">
is what happens when the Button is pressed. You can easily define the background of the Border element
<VisualState x:Name="Pressed">
<Storyboard>
<PointerDownThemeAnimation Storyboard.TargetName="Grid"/>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonPressedForegroundThemeBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="Border">
<DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource bodyAccent}"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
The important part is the ObjectAnimationUsingKeyFrames targeting Background property of the element with the name "Border"
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="Border">
<DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource bodyAccent}"/>
</ObjectAnimationUsingKeyFrames>
And Button style is applied like this:
<Button Height="200" Style="{StaticResource ButtonStyle1}"/>
来源：https://stackoverflow.com/questions/23858332/custom-buttons-in-wp8-1-xaml-apps