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ScrollViewer not working around a Grid RRS feed

  • Question

  • This has got to have a simple answer, but I'm stumped. I have a ScrollViewer with a Grid inside. The height of the Grid requires a vertical scrollbar. At runtime, the scrollbar is visible, but appears disabled and has no scroll indicator between the two arrows. If the window is short enough, the bottom arrow doesn't appear, telling me that it is not clipping the Grid according to the height of the window.

    I tried putting a height on the ScrollViewer, but that is obviously incorrect because it doesn't resize with the window. I've tried not setting the Grid height and setting it to Auto. But I don't want to set a numeric value for the Grid height - I'd rather WPF compute that for me.

    What am I missing?

    (In the code block below, I realize the Grid is disabled. It is enabled elsewhere when the user clicks a button. All the column widths are * and all the row heights are Auto.)

    <ScrollViewer VerticalScrollBarVisibility="Visible" HorizontalScrollBarVisibility="Auto">
     <Grid Name="theGrid" Margin="10" IsEnabled="False" Height="Auto">
      <Grid.ColumnDefinitions>
       <ColumnDefinition Width="*" />
       <ColumnDefinition Width="*" />
       ...
      </Grid.ColumnDefinitions>
      <Grid.RowDefinitions>
       <RowDefinition Height="Auto" />
       <RowDefinition Height="Auto" />
       ...
      </Grid.RowDefinitions>
     </Grid>
     ...
    </ScrollViewer>
    

    Thanks for any help,
    Ray 

    Tuesday, August 10, 2010 4:24 PM

Answers

  • Hi Ray,

    Just like I mentioned, the height of the ScrollViewer is not limited in your code. The second row of the outer Grid has a height of "Auto", which will allow it's children to render at their desired height, even if there are not enough space.  And also the StackPanel will not limit it's child's height. As a result, the ScrollViewer resize itself against the inner grid and the scrollbar will never become enable.

    A simple fix to your code is to change the Height of the second RowDefinition from "Auto" to "*" as the following.

        <TabControl Margin="5">
          <TabItem Header="Request for Bid/Budget" DataContext="{Binding Source={StaticResource budgetsView}}">
            <StackPanel Orientation="Horizontal">
              <ListBox Name="budgetListBox" Width="200" Margin="5" 
           ItemsSource="{Binding}" IsSynchronizedWithCurrentItem="True">
                ...
              </ListBox>
              <Grid Name="budgetGrid" Height="{Binding Path=ActualHeight, ElementName=budgetListBox}">
                <Grid.ColumnDefinitions>
                  <ColumnDefinition Width="*" />
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                  <RowDefinition Height="Auto" />
                  <RowDefinition Height="*" />
                </Grid.RowDefinitions>
                <DockPanel Grid.Column="0" Grid.Row="0" Margin="10,10">
                  ...
                </DockPanel>
                <ScrollViewer Grid.Column="0" Grid.Row="1" VerticalScrollBarVisibility="Visible" HorizontalScrollBarVisibility="Auto" Background="#FFFFFFC7">
                  <Grid Name="budgetDetailsGrid" Margin="10" IsEnabled="False" Height="{Binding Path=ActualHeight, ElementName=budgetListBox}">
                    ...
                  </Grid>
                </ScrollViewer>
              </Grid>
            </StackPanel>
          </TabItem>
        </TabControl>
    

    If you still have any doubts or concerns about this issue, please feel free to let me know.

    Best regards,

    Min


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    Friday, August 13, 2010 1:41 AM

All replies

  • You might want to explicitly set the Height of the Grid, otherwise, the scroll bar would be visible when the container containing the scrollViewer (e.g. Window) has lesser height then the items contained by the grid.

    Thanks,

    Muhammad

    shujaatsiddiqi.blogspot.com


    Shujaat Siddiqi
    Tuesday, August 10, 2010 4:38 PM
  • Muhammad, if I may summarize what you said:
    If I don't set the Height of the Grid, the scroll bar would be visible when the Window has lesser height than the items in the Grid.

    But don't I want the scrollbar to be visible then? I want to see the scroll bar when the Window is shorter than the natural Grid height.

    In any event, I changed the Grid Height as follows (seems a bit self-referential, but WTH). My ScrollViewer still behaves the same way.

    <Grid Name="theGrid" Margin="10" IsEnabled="False" Height="{Binding Path=ActualHeght, ElementName=theGrid}">
    
    Ray
    Tuesday, August 10, 2010 6:12 PM
  • Hi T.Ray,

    Are you using this ScrollViewer inside a StackPanel? It seems the height of the ScrollViewer is not restricted by anything in this case, and a StackPanel is very likely the cause.

    The ScrollViewer is disabled because it is as large as the grid so there is nothing to scroll to. The entire grid is already displayed in the ScrollViewer, and the ScorllViewer is clipped so you cannot see the rest of grid.

    To fix this, you can place the the ScollViewer in another panel that do limit the height of it's children, such as Grid.

    Please feel free to let me know if this doesn't solve your problem.

    Best regards,

    Min


    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
    Thursday, August 12, 2010 3:03 AM
  • Hi T.Ray,

    The example below should work for you.  Try to set the VerticalScrollBarVisibility="Auto" if you dont want to display the scrollbar when more than the minimum height.  Scrollbar will display only when the Grid MinHeight is reached.

    <Window x:Class="WpfApplicationXML.WindowScrollV"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      Title="WindowScrollV" Height="300" Width="300">
      <ScrollViewer VerticalScrollBarVisibility="Auto">
      <Grid MinHeight="30" Height="240">
          <TextBlock Margin="300, 500" />
        </Grid>
       </ScrollViewer>
    </Window>
    

     

    Regards,

    gioVhan


    Please remember to mark the replies as answers if they help and unmark them if they provide no help.
    Thursday, August 12, 2010 5:32 AM
  • Hi Min,

    You are correct that I did have the ScrollViewer inside a vertical StackPanel. What you say makes sense, and I made some changes but it still doesn't work. I've included the updated XAML with the controls wrapping the ScrollViewer as well.

    A TabControl is the whole window, and the first tab is the one in question. It has a StackPanel with a ListBox on the left and the new Grid you suggested on the right. Basically, the user selects an item in the ListBox and the details are shown on the right. The new Grid has two rows, the first being a DockPanel with buttons. The second row is the ScrollViewer.

    I should say that I'm expecting scrolling to be necessary for smaller resolutions because there are quite a few controls to display. The ListBox is correctly resizing itself to the height of the Window. But the SrollViewer still does not show a vertical scrollbar even though all its constituent controls are not visible. In this example, I've also tried setting the Height of both the outer and inner Grids to the ActualHeight of the ListBox, but that doesn't help.

      <TabControl Margin="5">
        <TabItem Header="Request for Bid/Budget" DataContext="{Binding Source={StaticResource budgetsView}}">
          <StackPanel Orientation="Horizontal">
            <ListBox Name="budgetListBox" Width="200" Margin="5" 
                 ItemsSource="{Binding}" IsSynchronizedWithCurrentItem="True">
              ...
            </ListBox>
            <Grid Name="budgetGrid" Height="{Binding Path=ActualHeight, ElementName=budgetListBox}">
              <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*" />
              </Grid.ColumnDefinitions>
              <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
              </Grid.RowDefinitions>
              <DockPanel Grid.Column="0" Grid.Row="0" Margin="10,10">
                ...
              </DockPanel>
              <ScrollViewer Grid.Column="0" Grid.Row="1" VerticalScrollBarVisibility="Visible" HorizontalScrollBarVisibility="Auto" Background="#FFFFFFC7">
                <Grid Name="budgetDetailsGrid" Margin="10" IsEnabled="False" Height="{Binding Path=ActualHeight, ElementName=budgetListBox}">
                  ... 
                </Grid>
              </ScrollViewer>
            </Grid>
          </StackPanel>
        </TabItem>
      </TabControl>
    
    

    Thanks for any advice,

    Ray 

    Thursday, August 12, 2010 11:34 AM
  • Hi,

    Use VerticalAlignement and HorizontalAlignement > Stretch on your grid, and delete your Height binding.

    Another thing : your stackPanel may not be the good layout to use in your case. Other panels that you use may not be the optimal choice anyway.
    I recommend you to use a Grid as child of your tabItem, with 2rows + 2columns. The ListBox is row0/cell0 with rowspan1, Dock is row0/cell1, Scrollviewer is row1/cell1

    It's a best practice to set the dimensions at the top most level as possible. The columns and rowsdefinition are good choices.

    Thursday, August 12, 2010 12:06 PM
  • Hi Echtelion,

    VerticalAlignment=Stretch is the default for Grid, so I think not setting it is the same as setting it.

    I tried your suggestion of replacing the outer horizontally aligned StackPanel with a Grid, but it seemed to make things worse. The ListBox then was the height of the adjacent Grid, and I really want it the other way around. I want to make the ListBox 200 wide, but height adjusting to the Window (it is doing this, BTW). I want to make the adjacent Grid height adjust the same way with a scrollbar if the Window isn't tall enough to show the whole thing.

    Rather like Windows Explorer, but with a ListBox rather than a tree on the left.

    So here's a simplified rewording of the question: How do I layout a Window in WPF that behaves much like Windows Explorer, with a ListBox in the left pane and a Grid of controls in the right? The ListBox will manage its own scrollbar, but I need to add a vertical scrollbar to the Grid on the right that is shown if the overall Window is too short.

    Maybe this isn't as simple as I thought. I just thought it was my limited experience with WPF.

    Ray

    Thursday, August 12, 2010 12:56 PM
  • Hi,

    Are you even trying my previous example?  That If I understood your problem correctly.

    Here is the next one and I enhanced a little bit.  You can tune it.

    This is the same explanation I have.  Set the MinHeight/Width.

    Can you copy and paste starting from <Grid>?

    <Window x:Class="WpfApplication2.Window1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Window1" Height="300" Width="300" >
      <Grid >
        <Grid.ColumnDefinitions>
          <ColumnDefinition Width="103" />
          <ColumnDefinition Width="400*" />
        </Grid.ColumnDefinitions>
        <ListBox Height="311" HorizontalAlignment="Left" Name="listBox1" VerticalAlignment="Top" Width="103" />
        <ScrollViewer Grid.Column="1" Name="scrollViewer1" >
          <Grid MinHeight="300" MinWidth="300">
            
          </Grid>
        </ScrollViewer>
      </Grid>
    </Window>
    
    

    Regards,

    gioVhan


    Please remember to mark the replies as answers if they help and unmark them if they provide no help.
    Thursday, August 12, 2010 3:14 PM
  • Hi Ray,

    Just like I mentioned, the height of the ScrollViewer is not limited in your code. The second row of the outer Grid has a height of "Auto", which will allow it's children to render at their desired height, even if there are not enough space.  And also the StackPanel will not limit it's child's height. As a result, the ScrollViewer resize itself against the inner grid and the scrollbar will never become enable.

    A simple fix to your code is to change the Height of the second RowDefinition from "Auto" to "*" as the following.

        <TabControl Margin="5">
          <TabItem Header="Request for Bid/Budget" DataContext="{Binding Source={StaticResource budgetsView}}">
            <StackPanel Orientation="Horizontal">
              <ListBox Name="budgetListBox" Width="200" Margin="5" 
           ItemsSource="{Binding}" IsSynchronizedWithCurrentItem="True">
                ...
              </ListBox>
              <Grid Name="budgetGrid" Height="{Binding Path=ActualHeight, ElementName=budgetListBox}">
                <Grid.ColumnDefinitions>
                  <ColumnDefinition Width="*" />
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                  <RowDefinition Height="Auto" />
                  <RowDefinition Height="*" />
                </Grid.RowDefinitions>
                <DockPanel Grid.Column="0" Grid.Row="0" Margin="10,10">
                  ...
                </DockPanel>
                <ScrollViewer Grid.Column="0" Grid.Row="1" VerticalScrollBarVisibility="Visible" HorizontalScrollBarVisibility="Auto" Background="#FFFFFFC7">
                  <Grid Name="budgetDetailsGrid" Margin="10" IsEnabled="False" Height="{Binding Path=ActualHeight, ElementName=budgetListBox}">
                    ...
                  </Grid>
                </ScrollViewer>
              </Grid>
            </StackPanel>
          </TabItem>
        </TabControl>
    

    If you still have any doubts or concerns about this issue, please feel free to let me know.

    Best regards,

    Min


    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
    Friday, August 13, 2010 1:41 AM
  • Hi Min,

    That worked great! I had not understood the subtlety of the difference in "Auto" and "*". It sounds like "Auto" lets its children determine the desired height, and "*" doesn't ask the children but perhaps defers to the parent?

    Incidently, I woke up early this morning thinking about a DockPanel. I searched and found this answer:
    http://stackoverflow.com/questions/1284600/scrollviewer-not-scrolling

    This post was about the same problem and a DockPanel in place of my outer Grid produces the same result. And from what you've said, it would be for more or less the same reason. My new outer DockPanel would have my current inner DockPanel docked to the top, and the Grid would not be docked and thus take up the rest of the available space. This produces the same result as RowHeight="*" above.

    Thanks for your excellent help.

    Ray

    Friday, August 13, 2010 8:21 AM
  • Hi ,

    I am also facing similar issue. As my window is resizable, i can not provide fixed height. I have tried all the suggestion in this thread, but nothing seems to work. Please let me know , what I am missing ? Immediate help will be of great help!! i have removed stack panel & doc panel, Put Height as * to make sure it works. But no luck :(

    <UserControl x:Class=".IncidentDetailNotebook.IncidentFilesView"
                 x:Name="FileListView"
                 Loaded="FileListView_Loaded"        
                 mc:Ignorable="d"         d:DesignHeight="600" d:DesignWidth="850" >
        <Grid HorizontalAlignment="Left" Width="850">
            <Grid.RowDefinitions>
                <RowDefinition Height="auto" />
                <RowDefinition Height="*" />
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="auto" />
                <ColumnDefinition Width="15" />
                <ColumnDefinition Width="*" MaxWidth="400" />
            </Grid.ColumnDefinitions>
            <!-- Header -->
            <Border Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="3" 
                    Background="{StaticResource BlueLBrush}"
                    Margin="5" Height="25" HorizontalAlignment="Stretch">
                <TextBlock Text="Files Notebook" Margin="5" />
            </Border>
            
            <!-- Input Screen -->
            <Grid Grid.Row="1" Grid.Column="0" VerticalAlignment="Top" Margin="5">
                <Grid.RowDefinitions>
                    <RowDefinition Height="*" />
                    <RowDefinition Height="*" />
                </Grid.RowDefinitions>
    
                <DataGrid Grid.Row="0" Style="{StaticResource IncidentNotebookGridStyle}"
                          ItemsSource="{Binding Path=ItemsList}" 
                          IsEnabled="{Binding Path=AddNew, Converter={StaticResource OppositeBoolConverter}}"
                          SelectedItem="{Binding Path=SelectedItem, Mode=TwoWay}">
                    <DataGrid.Columns>
                        <DataGridTemplateColumn Header="File Type">
                            <DataGridTemplateColumn.CellTemplate>
                                <DataTemplate>
                                    <dasCtrl:FileTypeImageDisplayer x:Name="FileTypeImageDisplayer"
                                        Width="25" Height="25" FileType="{Binding FileType}" />
                                </DataTemplate>
                            </DataGridTemplateColumn.CellTemplate>
                        </DataGridTemplateColumn>
                        
                        <DataGridTemplateColumn Header="File Name" Width="*">
                            <DataGridTemplateColumn.CellTemplate>
                                <DataTemplate>
                                    <TextBlock>     
                                        <Hyperlink 
                                            IsEnabled="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsEnabled}"
                                            Command="{Binding RelativeSource={RelativeSource AncestorType={x:Type local:IncidentFilesView}}, Path=DataContext.LoadFileCommand}"
                                            CommandParameter="{Binding Path=FileName}">  
                                            <TextBlock Text="{Binding Path=FileName}" />  
                                        </Hyperlink>    
                                    </TextBlock>
                                </DataTemplate>
                            </DataGridTemplateColumn.CellTemplate>
                        </DataGridTemplateColumn>
    
                        <DataGridTextColumn Binding="{Binding Path=DateAttached, StringFormat={}{0:MM/dd/yyyy HH:mm:ss}}"
                                            Header="Date Attached" IsReadOnly="True" />
                    </DataGrid.Columns>
                </DataGrid>
    
                <DockPanel Grid.Row="1" Grid.Column="2" HorizontalAlignment="Right" 
                            Margin="0,5,0,0" LastChildFill="False" Width="350"
                            IsEnabled="{Binding AddNew, Converter={StaticResource OppositeBoolConverter}}">
                    <StackPanel DockPanel.Dock="Right" Orientation="Horizontal">
                        <Button Content="Add" Height="25" Width="60" Tag="EnabledByDefault"
                                Command="{Binding Path=AddCommand}" />
                        <Button Content="Remove" Height="25" Margin="5,0"  Width="60"
                                Command="{Binding Path=RemoveCommand}" Tag="EnabledByDefault"
                                IsEnabled="{Binding Path=SelectedItem.ID, Converter={StaticResource IntToOppositeBoolConverter}}" />                    
                    </StackPanel>
                </DockPanel>
            </Grid>
            <ScrollViewer Grid.Row="1" Grid.Column="2" Margin="5" VerticalScrollBarVisibility="Visible">
                <Grid >
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*" />
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                    <RowDefinition Height="20*" />
                    <RowDefinition Height="20*" />
                    <RowDefinition Height="20*" />
                    <RowDefinition Height="20*" />
                    <RowDefinition Height="20*" />
                </Grid.RowDefinitions>
    
                <!-- File Name -->
                <TextBlock Grid.Row="0" Grid.Column="0" Margin="0,5" Text="File Name" />
                
                <Grid Grid.Row="1" Grid.Column="0" IsEnabled="{Binding Path=AddNew}">
                    <Grid.RowDefinitions>
                        <RowDefinition Height="auto" />
                    </Grid.RowDefinitions>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="*" />
                        <ColumnDefinition Width="auto" />
                    </Grid.ColumnDefinitions>
                    <TextBox Grid.Row="0" Grid.Column="0" HorizontalAlignment="Stretch"
                             Style="{StaticResource RequiredFieldTextBoxStyle}" 
                             Text="{Binding SelectedItem.FilePath, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged, ValidatesOnExceptions=True, NotifyOnValidationError=True}" />
                    <Button Grid.Row="0" Grid.Column="1" Content="Browse" 
                            Command="{Binding Path=BrowseCommand}" Height="25" 
                            HorizontalAlignment="Right" Margin="5,0" Width="60" />
                </Grid>
    
                <!-- Description -->
                <TextBlock Grid.Row="2" Grid.Column="0" Margin="0,5,0,0" Text="Description" />
                <TextBox TextWrapping="Wrap" MaxLength="1000"
                        Grid.Row="3" Grid.Column="0" Margin="0,5,0,0" Height="250"
                        ScrollViewer.CanContentScroll="True"
                        ScrollViewer.HorizontalScrollBarVisibility="Disabled"
                        ScrollViewer.VerticalScrollBarVisibility="Visible"
                        MinHeight="45" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
                        Style="{StaticResource RequiredFieldTextBoxWithBackgroundStyle}" AcceptsReturn="True"  
                        Text="{Binding Path=SelectedItem.Description, Mode=TwoWay, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged, ValidatesOnExceptions=True, NotifyOnValidationError=True}" 
                        IsReadOnly="{Binding Path=AddNew, Converter={StaticResource OppositeBoolConverter}}" />
    
                <!--Save + Cancel Command--> 
                <!--<StackPanel Grid.Row="4" Grid.Column="0" HorizontalAlignment="Right" Margin="0,5,0,0" Orientation="Horizontal">
                    <Button Content="Save" Width="60" Height="25"
                            Command="{Binding Path=SaveCommand}" HorizontalAlignment="Right" 
                            IsEnabled="{Binding Path=IsValid}" />
                    <Button Margin="5,0,0,0" Content="Cancel" Height="25" 
                            HorizontalAlignment="Right" Width="60" 
                            Command="{Binding Path=CancelCommand}"
                            IsEnabled="{Binding Path=AddNew}" />
                </StackPanel>-->
            </Grid>
            </ScrollViewer>
        </Grid>
    </UserControl>
    

    Friday, January 27, 2012 11:00 AM
  • <ScrollViewer 
                    VerticalAlignment="Top"
                    Grid.Column ="0"    
                    Height="75"
                    Grid.Row="0">
    </ScrollViewer>
    apply screen resolution then not adjust scrollviewer automatically
    Tuesday, December 4, 2018 6:54 AM