1

y 我的滚动查看器直到结束才滚动。它被击中到一个有限的位置。我附加了我的 xaml 代码。我在代码中放置了一个画布。滚动查看器位于 2 个网格内。

<ScrollViewer>
    <Canvas Margin="0,0,0,0">
        <toolkit:ListPicker x:Name="listPicker"  ItemTemplate="{StaticResource PickerItemTemplate}" 
                    FullModeItemTemplate="{StaticResource PickerFullModeItemTemplate}"  CacheMode="BitmapCache"
                    Header="" Margin="12,246,210,298" FontFamily="Yu Gothic" FontSize="22" FontWeight="SemiBold" Width="240" />

        <toolkit:ListPicker x:Name="listPicker2"  ItemTemplate="{StaticResource PickerItemTemplate}" ItemCountThreshold="3"
                    FullModeItemTemplate="{StaticResource PickerFullModeItemTemplate}"  CacheMode="BitmapCache"
                    Header=""  Margin="9,343,210,206" Width="240" />
        <toolkit:ListPicker CacheMode="BitmapCache" FullModeItemTemplate="{StaticResource PickerFullModeItemTemplate}" Header="" ItemCountThreshold="3" ItemTemplate="{StaticResource PickerItemTemplate}" Margin="12,440,210,108" Name="listPicker1" Width="240" />
        <toolkit:ListPicker CacheMode="BitmapCache" FullModeItemTemplate="{StaticResource PickerFullModeItemTemplate}" Header="" ItemCountThreshold="3" ItemTemplate="{StaticResource PickerItemTemplate}" Margin="11,546,210,2" Name="listPicker3" Width="240" />

        <TextBlock Height="40" HorizontalAlignment="Left" Margin="30,212,0,0" Name="textBlock1" Text="MONTHLY DEBTS" VerticalAlignment="Top" Width="185" FontSize="24" />
        <TextBlock Height="40" HorizontalAlignment="Left" Margin="290,212,0,0" Name="textBlock2" Text="AMOUNTS" VerticalAlignment="Top" Width="147" FontSize="24" />

        <clrtb:ClearableTextBox Canvas.Left="246" Canvas.Top="242" Height="75" Name="qualifytb" Width="208" />
        <clrtb:ClearableTextBox Canvas.Left="242" Canvas.Top="338" Height="75" Name="clearableTextBox1" Width="208" />
        <clrtb:ClearableTextBox Canvas.Left="246" Canvas.Top="436" Height="75" Name="clearableTextBox2" Width="208" />
        <clrtb:ClearableTextBox Canvas.Left="244" Canvas.Top="542" Height="75" Name="clearableTextBox3" Width="208" />
        <TextBlock Text="DEBT RATIO" Canvas.Left="148" Canvas.Top="642" FontSize="26" FontWeight="Medium" />
        <TextBlock Text="Conv Debt Ratio:" Canvas.Left="30" Canvas.Top="700" FontSize="26" FontWeight="Medium" />
        <TextBlock Text="FHA Debt Ratio:" Canvas.Left="30" Canvas.Top="800" FontSize="26" FontWeight="Medium" />
        <TextBlock Text="VA Debt Ratio:" Canvas.Left="30" Canvas.Top="900" FontSize="26" FontWeight="Medium" />
        <clrtb:ClearableTextBox Canvas.Left="250" Canvas.Top="700" Height="75" Name="rt1" Width="208" />
        <clrtb:ClearableTextBox Canvas.Left="320" Canvas.Top="700" Height="75" Name="rt2" Width="208" />
        <clrtb:ClearableTextBox Canvas.Left="250" Canvas.Top="800" Height="75" Name="rt3" Width="208" />
        <clrtb:ClearableTextBox Canvas.Left="320" Canvas.Top="800" Height="75" Name="rt4" Width="208" />
        <clrtb:ClearableTextBox Canvas.Left="250" Canvas.Top="900" Height="75" Name="rt5" Width="208" />
    </Canvas>
</ScrollViewer>
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2 回答 2

1

我发现了这个 SO 问题：ScrollBars are not visible after changes of controls of controls inside a Canvas，这基本上是一个类似的问题。这个问题是特定于 WPF 的，但也可以应用于 WP/Silverlight。

问题是Canvas总是返回DesiredSize(0, 0)，所以 ScrollViewer 永远不会认为它需要滚动。

解决方案很简单：只需使用StackPanelorGrid代替Canvas. 如果您真的需要 Canvas，则必须覆盖MeasureOverride。

于 2012-06-21T15:30:29.987 回答
0

Canvas is not the right layout panel to be using, it's going to produce weird behavior the way you're using it. It's meant to be used when you need finite control over positioning and you are willing to write significant logic to support edge cases that pop up. Try using Grid, and configure it with columns and rows.

于 2012-06-21T20:25:16.677 回答