Трансформация на височината на Silverlight елипса

Уча Silverlight за WP7 и се натъкнах на лек проблем: искам да трансформирам височината в 1 и обратно (така че изглежда като въртене) около центъра (прави го автоматично за ширина). Код:

<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>

c# xaml transformation silverlight ellipse
person SBoss    schedule 21.09.2011    source източник

Отговори (2)


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Това е заради контейнера --- Border element. Границата е в StackPanel и нейната височина се определя от дъщерния елемент. Така че, когато височината на елипсата намалява, височината на границата също намалява.

Решението е просто, дайте на границата фиксирана височина.

e.g.

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

Надявам се това да помогне.

person Jason Li    schedule 21.09.2011
comment
Благодаря, че проработи! Но как можете да зададете височината да кажем 50%? Значи бутоните заемат 50% и рамката заема 50%? Изглежда не работи с 50* - person SBoss; 21.09.2011
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Ако искате да използвате процент, за да зададете височината, трябва да използвате Grid като контрола на оформлението. След това задайте височината на реда 0,5*. - person Jason Li; 21.09.2011

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Може би това е, което искате.

<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>
person Jason Li    schedule 21.09.2011