show grid in expander.

https://stackoverflow.com/questions/18085532

23-06-2022
|

سؤال

I m trying to create the expander with the header on right side and than add a grid to that exapnder. when i run this grids textblock doesnt apper. And like to know what are best way to create expander header on right side.

<StackPanel >
            <Expander Header="Customer Detail" IsExpanded="False" Style="{StaticResource MainViewExpander}"  >
                <Expander.Content>
                    <StackPanel HorizontalAlignment="Stretch">
                    <Grid x:Name="ImageInformation"  Margin="0">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="1.8*"/>
                            <ColumnDefinition Width="1.4*"/>
                            <ColumnDefinition Width="2.8*"/>
                        </Grid.ColumnDefinitions>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="0.9*" />
                            <RowDefinition Height="0.7*" />
                            <RowDefinition Height="0.7*" />
                        </Grid.RowDefinitions>
                        <Image Source="{Binding XPath=x.null}" Grid.Column="0" Grid.RowSpan="3"/>
                        <TextBlock Name="Customername" 
                                   Grid.Column="1" 
                                   Grid.ColumnSpan="2" 
                                   Text="Customer Name" 
                                   HorizontalAlignment="Left" 
                                   VerticalAlignment="Bottom" 
                                   TextWrapping="NoWrap" Margin="0,0,0,13" Width="140" Height="22"/>
                        <TextBlock Name="Born" 
                                   Grid.Column="1" 
                                   Grid.Row="1" 
                                   Text="Born" 
                                   HorizontalAlignment="Left" 
                                   VerticalAlignment="Center" 
                                   TextWrapping="NoWrap" Margin="2" Width="60" />
                        <TextBlock Name="BornDetail" 
                                   Grid.Column="2" 
                                   Grid.Row="1" 
                                   Text="BornDetail" 
                                   HorizontalAlignment="Left" 
                                   VerticalAlignment="Center" 
                                   TextWrapping="NoWrap" Margin="2" Width="125" />
                        <TextBlock Name="Speak" 
                                   Grid.Column="1" 
                                   Grid.Row="2" 
                                   Text="Speak" 
                                   HorizontalAlignment="Left" 
                                   VerticalAlignment="Center" 
                                   TextWrapping="NoWrap" Margin="2" Width="60" />
                        <TextBlock Name="SpeakDetail" 
                                   Grid.Column="2" 
                                   Grid.Row="2" 
                                   Text="Speak" 
                                   HorizontalAlignment="Left" 
                                   VerticalAlignment="Center" 
                                   TextWrapping="NoWrap" Margin="2" Width="125" Height="16" MaxHeight="20" MaxWidth="135"/>

                    </Grid>
                    <Grid Height="150" Width="295">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="1*" ></ColumnDefinition>
                            <ColumnDefinition Width="2*"></ColumnDefinition>
                        </Grid.ColumnDefinitions>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="1.2*"></RowDefinition>
                            <RowDefinition Height="1.2*"></RowDefinition>
                            <RowDefinition Height="1.2*"></RowDefinition>
                            <RowDefinition Height="1.2*"></RowDefinition>
                            <RowDefinition Height="1.2*"></RowDefinition>
                            <RowDefinition Height="1.2*"></RowDefinition>
                            <RowDefinition Height="1.2*"></RowDefinition>
                            <RowDefinition Height="1.2*"></RowDefinition>
                            <RowDefinition Height="1.2*"></RowDefinition>
                        </Grid.RowDefinitions>

                        <TextBlock Text="" Grid.Column="0" Grid.Row="0" TextWrapping="NoWrap" HorizontalAlignment="Left"></TextBlock>
                        <TextBlock Text="" Grid.Column="1" Grid.Row="0" TextWrapping="NoWrap" HorizontalAlignment="Left"></TextBlock>
                        <TextBlock Text="" Grid.Column="0" Grid.Row="1" TextWrapping="NoWrap" HorizontalAlignment="Left"></TextBlock>
                        <TextBlock Text="" Grid.Column="1" Grid.Row="1" TextWrapping="NoWrap" HorizontalAlignment="Left"></TextBlock>
                        <TextBlock Text="" Grid.Column="0" Grid.Row="2" TextWrapping="NoWrap" HorizontalAlignment="Left"></TextBlock>
                        <TextBlock Text="" Grid.Column="1" Grid.Row="2" TextWrapping="NoWrap" HorizontalAlignment="Left"></TextBlock>
                        <TextBlock Text="" Grid.Column="0" Grid.Row="3" TextWrapping="Wrap" HorizontalAlignment="Left"></TextBlock>
                        <TextBlock Text="" Grid.Column="1" Grid.Row="3" TextWrapping="NoWrap" HorizontalAlignment="Left"></TextBlock>
                        <TextBlock Text="" Grid.Column="0" Grid.Row="4" TextWrapping="NoWrap" HorizontalAlignment="Left"></TextBlock>
                        <TextBlock Text="" Grid.Column="1" Grid.Row="4" TextWrapping="NoWrap" HorizontalAlignment="Left"></TextBlock>
                        <TextBlock Text="" Grid.Column="0" Grid.Row="5" TextWrapping="NoWrap" HorizontalAlignment="Left"></TextBlock>
                        <TextBlock Text="" Grid.Column="1" Grid.Row="5" TextWrapping="NoWrap" HorizontalAlignment="Left"></TextBlock>
                        <TextBlock Text="" Grid.Column="0" Grid.Row="6" TextWrapping="NoWrap" HorizontalAlignment="Left"></TextBlock>
                        <TextBlock Text="" Grid.Column="1" Grid.Row="6" TextWrapping="NoWrap" HorizontalAlignment="Left"></TextBlock>
                        <TextBlock Text="" Grid.Column="0" Grid.Row="7" TextWrapping="NoWrap" HorizontalAlignment="Left"></TextBlock>
                        <TextBlock Text="" Grid.Column="1" Grid.Row="7" TextWrapping="NoWrap" HorizontalAlignment="Left"></TextBlock>
                        <TextBlock Text="" Grid.Column="0" Grid.Row="8" TextWrapping="NoWrap" HorizontalAlignment="Left"></TextBlock>
                        <TextBlock Text="" Grid.Column="1" Grid.Row="8" TextWrapping="NoWrap" HorizontalAlignment="Left"></TextBlock>
                        <TextBlock Text="" Grid.Column="0" Grid.Row="9" TextWrapping="NoWrap" HorizontalAlignment="Left"></TextBlock>
                        <TextBlock Text="" Grid.Column="1" Grid.Row="9" TextWrapping="NoWrap" HorizontalAlignment="Left"></TextBlock>
                    </Grid>
                   </StackPanel>
                </Expander.Content>
            </Expander>
 </StackPanel>

My stylesheet is something like this:

<UserControl.Resources >
        <!-- Main Expander Header Brushes -->
        <SolidColorBrush x:Key="MainExpanderHeaderBackgroundBrush" Color="#FF3771C1"/>
        <SolidColorBrush x:Key="MainExpanderHeaderBorderBrush" Color="Black"/>

        <!-- Main Expander Content Brushes -->
        <SolidColorBrush x:Key="MainExpanderContentBorderBrush" Color="Black" />

        <!-- Main Expander Control Brushes (affect the whole control, not just header or content -->
        <SolidColorBrush x:Key="MainExpanderControlNormalForegroundBrush" Color="White" />
        <SolidColorBrush x:Key="MainExpanderControlDisabledForegroundBrush" Color="DarkGray" />
        <SolidColorBrush x:Key="MainExpanderControlDisabledBackgroundBrush" Color="LightGray" />
        <SolidColorBrush x:Key="MainExpanderControlDisabledBorderBrush" Color="LightGray" />

        <!-- Main Expander Toggle Button Brushes -->
        <SolidColorBrush x:Key="ExpanderToggleButtonBackgroundBrush" Color="White" />
        <SolidColorBrush x:Key="ExpanderToggleButtonMouseOverFillBrush" Color="Green" />
        <SolidColorBrush x:Key="ExpanderToggleButtonPressedFillBrush" Color="Yellow" />

        <!-- Expander Toggle Button Template -->
        <ControlTemplate x:Key="ExpanderToggleButton" TargetType="ToggleButton">

            <!-- Note, the chevron toggle button gets its forground color from the templated parent.
             The parent must set this to a valid color when it is disabled. -->

            <Path 
            Name="Chevron"
            HorizontalAlignment="Center"
            VerticalAlignment="Center"
            Data="M 0 0 L 10 10 L 20 0 Z"
            Fill="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Foreground}"
            />

            <ControlTemplate.Triggers>
                <Trigger Property="IsChecked" Value="true">
                    <Setter TargetName="Chevron" Property="Data" Value="M 0 10 L 10 0 L 20 10 Z" />
                </Trigger>
                <Trigger Property="ToggleButton.IsMouseOver" Value="true">
                    <Setter TargetName="Chevron" Property="Fill" Value="{StaticResource ExpanderToggleButtonMouseOverFillBrush}" />
                </Trigger>
                <Trigger Property="IsPressed" Value="true">
                    <Setter TargetName="Chevron" Property="Fill" Value="{StaticResource ExpanderToggleButtonPressedFillBrush}" />
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>

        <Style x:Key="MainViewExpander" TargetType="Expander">
            <Setter Property="Foreground" Value="{StaticResource MainExpanderControlNormalForegroundBrush}"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="Expander">
                        <Grid>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto"/>
                                <RowDefinition Name="ContentRow"/>
                            </Grid.RowDefinitions>
                            <Border 
                                Name="HeaderBorder" 
                                Grid.Row="0" 
                                BorderThickness="1" 
                                CornerRadius="0,0,0,0" 
                                BorderBrush="{StaticResource MainExpanderHeaderBorderBrush}"
                                Background="{StaticResource MainExpanderHeaderBackgroundBrush}"
                                >

                                <Grid >
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="*" />
                                        <ColumnDefinition Width="20" />
                                    </Grid.ColumnDefinitions>

                                    <ContentPresenter 
                                        Grid.Column="0"
                                        Margin="4" 
                                        ContentSource="Header" 
                                        RecognizesAccessKey="True" 
                                        />
                                    <ToggleButton 
                                        Grid.Column="1"
                                        IsChecked="{Binding Path=IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
                                        OverridesDefaultStyle="True" 
                                        Template="{StaticResource ExpanderToggleButton}" 
                                        Background="{StaticResource ExpanderToggleButtonBackgroundBrush}" 
                                        />
                                </Grid>
                            </Border>

                            <Border 
                                Name="ContentBorder" 
                                Grid.Row="1" 
                                BorderBrush="{StaticResource MainExpanderContentBorderBrush}" 
                                BorderThickness="1,0,1,1" 
                                CornerRadius="0,0,0,0" 
                                >
                                <ContentPresenter Margin="4" />

                            </Border>
                        </Grid>

                        <!-- Triggers for the entire Expander Control -->
                        <ControlTemplate.Triggers>

                            <Trigger Property="IsExpanded" Value="True">
                                <Setter TargetName="ContentRow" Property="Height" Value="{Binding ElementName=Content, Path=DesiredHeight}" />
                            </Trigger>

                            <Trigger Property="IsEnabled" Value="False">
                                <Setter Property="Foreground" Value="{StaticResource MainExpanderControlDisabledForegroundBrush}"/>
                                <Setter TargetName="HeaderBorder" Property="Background" Value="{StaticResource MainExpanderControlDisabledBackgroundBrush}" />
                                <Setter TargetName="HeaderBorder" Property="BorderBrush" Value="{StaticResource MainExpanderControlDisabledBorderBrush}" />
                                <Setter TargetName="ContentBorder" Property="BorderBrush" Value="{StaticResource MainExpanderControlDisabledBorderBrush}" />
                            </Trigger>

                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>

            <Setter Property="HeaderTemplate">
                <Setter.Value>
                    <DataTemplate>
                        <TextBlock Text="{Binding}" 
                            Foreground="{StaticResource MainExpanderControlNormalForegroundBrush}" 
                            FontSize="18" 
                            FontWeight="Bold"
                            />
                    </DataTemplate>
                </Setter.Value>
            </Setter>

        </Style>

        <Style x:Key="MainViewExpanderCommands" 
           BasedOn="{StaticResource MainViewExpander}"  
           TargetType="Expander"
           >
            <Setter Property="FontSize" Value="20" />
            <Setter Property="FontWeight" Value="Bold" />
        </Style>
    </UserControl.Resources >

so how to get the data of grid in expander?

المحلول

There are three problems

The MainExpanderControlNormalForegroundBrush was White, so nothing was visible in the expander content area. Change it to black as shown below.
```
<SolidColorBrush x:Key="MainExpanderControlNormalForegroundBrush" Color="Black" />
```

In one of the triggers you are binding to an element with nameContent which is not there. You should be binding to ContentBorder as shown below.

<Trigger Property="IsExpanded" Value="True">
    <Setter TargetName="ContentRow" Property="Height" Value="{Binding ElementName=ContentBorder, Path=DesiredHeight}" />
</Trigger>

Set your ContentRow Height to 0 to bring the expander functionality.
```
<RowDefinition Name="ContentRow" Height="0"/>
```

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