Geek asks and answers

Avoid Using UserControl to Scroll Mouse Scrolling

We have UserControl, showing all possible enumeration values, presented as RadioButtonin ListBox, to select one of them. When this control is inside ScrollViewerwith other controls, such as text fields or something else, and you scroll the mouse wheel, it will not scroll the form ScrollViewerwhen the mouse cursor is over the EnumBox.

Here's what it looks like in the user interface:

EnumBox in UI

For demonstration, it RadioButtonhas a yellow background, the background is WrapPanelgreen. When the mouse cursor is inside a colored area (for example, within WrapPanel), scrolling with the mouse wheel is not affected.

The template for EnumBox is as follows:

  <UserControl.Template>
    <ControlTemplate TargetType="{x:Type clientsWpf:EnumBox}">
      <StackPanel>
        <GroupBox Header="{Binding Header, RelativeSource={RelativeSource AncestorType={x:Type clientsWpf:EnumBox}}}" IsReadOnly="{Binding IsReadOnly, RelativeSource={RelativeSource AncestorType={x:Type clientsWpf:EnumBox}}}">
          <Border x:Name="InvalidBorder"  BorderBrush="Red" BorderThickness="0" >
            <ListBox x:Name="PART_ListBox" HorizontalAlignment="Left" KeyboardNavigation.DirectionalNavigation="Cycle" Background="Transparent" BorderThickness="0" SelectedValuePath="." SelectedValue="{Binding Path=SelectedValue, RelativeSource={RelativeSource AncestorType={x:Type clientsWpf:EnumBox}}}" ScrollViewer.HorizontalScrollBarVisibility="Disabled">
              <ListBox.ItemsPanel>
                <ItemsPanelTemplate>
                  <WrapPanel Orientation="Horizontal" Background="Green"/>
                </ItemsPanelTemplate>
              </ListBox.ItemsPanel>
              <ListBox.Resources>
                <Style x:Key="{x:Type ListBoxItem}" TargetType="{x:Type ListBoxItem}" >
                  <Setter Property="Template">
                    <Setter.Value>
                      <ControlTemplate>
                        <Border Background="Transparent" Background="Yellow">
                          <RadioButton Margin="3" Focusable="False" Content="{TemplateBinding ContentControl.Content,Converter={StaticResource enumValueDescriptionConverter}}" 
                                     IsChecked="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListBoxItem}},Path=IsSelected}" />
                        </Border>
                      </ControlTemplate>
                    </Setter.Value>
                  </Setter>
                </Style>
              </ListBox.Resources>
            </ListBox>
          </Border>
        </GroupBox>
      </StackPanel>
    </ControlTemplate>
  </UserControl.Template>

ScrollViewer.VerticalScrollBarVisibility="Disabled" ScrollViewer.CanContentScroll="False" ListBox, WrapPanel, RadioButton Border .

ScrollBar.Scroll="WrapPanel_Scroll" , .

SelectiveScrollingGrid.SelectiveScrollingOrientation="None" RadioButton .

- , ?

: EnumBox, .

+3
2

, ListBox ScrollViewer. ListBox ScrollViewer.

ScrollViewer:

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <SolidColorBrush x:Key="ListBorder" Color="#828790"/>
        <Style x:Key="ListBoxStyleNoScrollViewer" TargetType="{x:Type ListBox}">
            <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>
            <Setter Property="BorderBrush" Value="{StaticResource ListBorder}"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
            <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
            <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
            <Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
            <Setter Property="ScrollViewer.PanningMode" Value="Both"/>
            <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
            <Setter Property="VerticalContentAlignment" Value="Center"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type ListBox}">
                        <Border x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="1" SnapsToDevicePixels="true">
                            <!--<ScrollViewer Focusable="false" Padding="{TemplateBinding Padding}">-->
                                <ItemsPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                            <!--</ScrollViewer>-->
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsEnabled" Value="false">
                                <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
                            </Trigger>
                            <Trigger Property="IsGrouping" Value="true">
                                <Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Window.Resources>
    <ScrollViewer>
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="200"/>
                <RowDefinition Height="100"/>
                <RowDefinition Height="200"/>
            </Grid.RowDefinitions>

            <ListBox Grid.Row="1" Style="{StaticResource ListBoxStyleNoScrollViewer}" >
                <ListBox.Items>
                    <ListBoxItem>One</ListBoxItem>
                    <ListBoxItem>Two</ListBoxItem>
                    <ListBoxItem>Three</ListBoxItem>
                    <ListBoxItem>Four</ListBoxItem>
                </ListBox.Items>
            </ListBox>
        </Grid>
    </ScrollViewer>
</Window>

Style="{StaticResource ListBoxStyleNoScrollViewer}", , . , , .

+3

, , ListBox, Border .. , . ListBox, A RGBA . , : # 000A0A09 ( A = 0%, )

0

More articles:


All Articles