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我正在为 WP7 学习 Silverlight 并且遇到了一个小问题：我想将高度转换为 1 并在中心周围转换回（所以它看起来像在旋转）（它会自动调整宽度）。代码：

<StackPanel x:Name="ContentPanel" Grid.Row="2" VerticalAlignment="Bottom">
    <StackPanel.Resources>
        <Storyboard x:Name="UpDownStoryBoard">
            <DoubleAnimation Storyboard.TargetName="FirstEllipse"
                Storyboard.TargetProperty="Height"
                To="1" AutoReverse="True"
                Duration="00:00:02" />
        </Storyboard>
        <Storyboard x:Name="LeftRightStoryBoard">
            <DoubleAnimation Storyboard.TargetName="FirstEllipse"
        Storyboard.TargetProperty="Width"
        To="1" AutoReverse="True"
        Duration="00:00:02" />
        </Storyboard>
    </StackPanel.Resources>
    <Border VerticalAlignment="Top">
        <Ellipse x:Name="FirstEllipse" Fill="Aqua"  Height="150" Width="300" HorizontalAlignment="Center" VerticalAlignment="Center"/>
    </Border>
    <Grid x:Name="ContentGrid" HorizontalAlignment="Center" VerticalAlignment="Center" Width="438">
                <Grid.RowDefinitions>
                    <RowDefinition Height="33*" />
                    <RowDefinition Height="33*" />
                    <RowDefinition Height="33*" />
                </Grid.RowDefinitions>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="33*" />
                    <ColumnDefinition Width="33*" />
                    <ColumnDefinition Width="33*" />
                </Grid.ColumnDefinitions>
                <Button Content="&lt;" Height="80" HorizontalAlignment="Center" Name="_lButton" VerticalAlignment="Center" Width="80" Grid.Row="1" Click="StartLeftRightStoryBoard" />
                <Button Content="&gt;" Height="80" HorizontalAlignment="Center" Name="_rButton" VerticalAlignment="Center" Width="80" Grid.Column="2" Grid.Row="1" Click="StartLeftRightStoryBoard" />
                <Button Content="^" Height="80" HorizontalAlignment="Center"  VerticalAlignment="Center" Name="_uButton" Width="80" Grid.Column="1" Click="StartUpDownStoryBoard" />
                <Button Content="v" Height="80" HorizontalAlignment="Center" VerticalAlignment="Center"  Name="_dButton" Width="80" Grid.Column="1" Grid.Row="2" Click="StartUpDownStoryBoard" />
            </Grid>
</StackPanel>
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2 回答 2

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这是因为容器---边框元素。Border 位于 StackPanel 中，其高度由子元素决定。所以当椭圆的高度下降时，边界的高度也会下降。

解决方法很简单，给边框一个固定的高度。

例如

<Border VerticalAlignment="Top" Height="400" Width="400">
      <Ellipse x:Name="FirstEllipse" Fill="Aqua"  Height="150" Width="300" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Border>

希望这可以帮助。

于 2011-09-21T11:43:15.640 回答
0

也许这就是你想要的。

<Grid x:Name="ContentPanel">
        <Grid.Resources>
            <Storyboard x:Name="UpDownStoryBoard">
                <DoubleAnimation Storyboard.TargetName="FirstEllipse"
                Storyboard.TargetProperty="Height"
                To="1" AutoReverse="True"
                Duration="00:00:02" />
            </Storyboard>
            <Storyboard x:Name="LeftRightStoryBoard">
                <DoubleAnimation Storyboard.TargetName="FirstEllipse"
        Storyboard.TargetProperty="Width"
        To="1" AutoReverse="True"
        Duration="00:00:02" />
            </Storyboard>
        </Grid.Resources>

        <Grid.RowDefinitions>
            <RowDefinition Height="0.5*" />
            <RowDefinition Height="0.5*" />
        </Grid.RowDefinitions>

        <Border>
            <Ellipse x:Name="FirstEllipse" Fill="Aqua"  Height="150" Width="300" HorizontalAlignment="Center" VerticalAlignment="Center"/>
        </Border>
        <Grid Grid.Row="1" x:Name="ContentGrid" HorizontalAlignment="Center" VerticalAlignment="Center" Width="438">
            <Grid.RowDefinitions>
                <RowDefinition Height="33*" />
                <RowDefinition Height="33*" />
                <RowDefinition Height="33*" />
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="33*" />
                <ColumnDefinition Width="33*" />
                <ColumnDefinition Width="33*" />
            </Grid.ColumnDefinitions>
            <Button Content="&lt;" Height="80" HorizontalAlignment="Center" Name="_lButton" VerticalAlignment="Center" Width="80" Grid.Row="1" Click="StartLeftRightStoryBoard" />
            <Button Content="&gt;" Height="80" HorizontalAlignment="Center" Name="_rButton" VerticalAlignment="Center" Width="80" Grid.Column="2" Grid.Row="1" Click="StartLeftRightStoryBoard" />
            <Button Content="^" Height="80" HorizontalAlignment="Center"  VerticalAlignment="Center" Name="_uButton" Width="80" Grid.Column="1" Click="StartUpDownStoryBoard" />
            <Button Content="v" Height="80" HorizontalAlignment="Center" VerticalAlignment="Center"  Name="_dButton" Width="80" Grid.Column="1" Grid.Row="2" Click="StartUpDownStoryBoard" />
        </Grid>
    </Grid>
于 2011-09-21T12:00:06.440 回答