In my program, I use ScrollViewer to display elements inside, but the problem is that when the ScrollViewer is filled with content, its height automatically changes and it becomes impossible to scroll since the height is equivalent to the content. I put a ScrollViewer inside a Grid and it automatically stretches to its full height VerticalAlignment="Stretch". I can't pre-limit its height because its height automatically adjusts to its parent to fill all the space. How can I solve this?
<Grid Grid.Column="0" RowSpacing="10">
<Grid.RowDefinitions>
<RowDefinition MaxHeight="35"/>
<RowDefinition MaxHeight="35"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid Grid.Row="2">
<ScrollViewer VerticalAlignment="Stretch" VerticalScrollMode="Enabled" VerticalScrollBarVisibility="Visible" HorizontalScrollMode="Disabled">
<ItemsControl x:Name="notesContent" Loaded="NotesContent_Loaded" Margin="0,0,15,0">
<ItemsControl.ItemContainerTransitions>
<TransitionCollection>
<AddDeleteThemeTransition>
</AddDeleteThemeTransition>
</TransitionCollection>
</ItemsControl.ItemContainerTransitions>
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ItemsControl>
</ScrollViewer>
</Grid>
</Grid>
The ScrollViewer automatically changes its height and does not scroll
The ScrollViewer parent is Grid, and you have set it's VerticalAlignment proeprty as Stretch, it will vertically fill into grid. And it is by design, you can refer to Grid document.
And if you want to make ScrollViewer scrollable, you need to make the content large than ScrollViewer actual height, and the better way is specific height value for ScrollViewer.
Related
In the XAML below:
<Grid>
<Grid.RowDefinitions>
<RowDefinition></RowDefinition>
<RowDefinition></RowDefinition>
<RowDefinition></RowDefinition>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition></ColumnDefinition>
<ColumnDefinition></ColumnDefinition>
</Grid.ColumnDefinitions>
<Button Grid.Row="0" Grid.Column="0" HorizontalAlignment="Center" Content="Button1"></Button>
<ListBox Grid.Row="1" Grid.Column="0" HorizontalAlignment="Center" VerticalAlignment="Center">
<ListBoxItem>Item1</ListBoxItem>
<ListBoxItem>Item2</ListBoxItem>
<ListBoxItem>Item3</ListBoxItem>
</ListBox>
</Grid>
Why does the ListBox occupy the entire width, even when the HorizontalAlignment is set to Center?
From the code provided by you, you haven’t set the Width property of ListBox. The default value of Width is Double.NaN. If the parent element’s Width is set, then the width of the ListBox will stretch to available width of its parent element. If the parent element’s Width is auto, then the Listbox will just take up required space.
In your scenario, you divided the height of the Grid into two equal parts by two ColumnDefinition tags. Therefore, your ListBox’s width will be equal to the cell’s width in the Row 1 and Column 0. You could try to set the value of Width property as auto of the first ColumnDefinition to view that the ListBox will only occupy the required width.
If you want center the ListBox in its parent element, you could set the Width of ListBox. Then the ListBox will be in the center of the cell.
For example:
<ListBox Grid.Row="1" Grid.Column="0" HorizontalAlignment="Center" VerticalAlignment="Center" Width="200">
If you want the items of ListBox in the center, you need to set the HorizontalAlignment property of ListBoxItem.
For example:
<ListBoxItem HorizontalAlignment="Center">Item1</ListBoxItem>
<ListBoxItem HorizontalAlignment="Center">Item2</ListBoxItem>
<ListBoxItem HorizontalAlignment="Center">Item3</ListBoxItem>
Hello I have this Page XAML. The problem its that the text inside each PivotItem doesn't scroll correctly, just scroll a bit but no to the end. Pivot works correctly, you can flip Items Horizontally. How can i achieve the correct behavior on the scrolls?
<StackPanel>
<Pivot>
<PivotItem>
<ScrollViewer VerticalScrollMode="Enabled">
<StackPanel Margin="0,0,12,0">
<TextBlock HorizontalAlignment="Left"
TextWrapping="WrapWholeWords"
Foreground="#5D5B5D"
FontWeight="Light"
TextAlignment="Justify"
Margin="0,0,12,0"
Padding="0,0,4,0"
Text="Change for this a very large text so it can scroll!!! "></TextBlock>
<Button Content="OK"
HorizontalAlignment="Center"
Margin="0,18"
Padding="42,4"></Button>
</StackPanel>
</ScrollViewer>
</PivotItem>
<PivotItem>
<ScrollViewer VerticalScrollMode="Enabled">
<StackPanel Margin="0,0,12,0">
<TextBlock HorizontalAlignment="Left"
TextWrapping="WrapWholeWords"
Foreground="#5D5B5D"
FontWeight="Light"
TextAlignment="Justify"
Margin="0,0,12,0"
Padding="0,0,4,0"
Text="Change for this a very large text so it can scroll!!! "></TextBlock>
<Button Content="OK"
HorizontalAlignment="Center"
Margin="0,18"
Padding="42,4"></Button>
</StackPanel>
</ScrollViewer>
</PivotItem>
</Pivot>
From your code I saw that you use a StackPanel outside of the Pivot control, and you didn't set the orientation property, so by default the StackPanel stacks items vertically from top to bottom in the order they are declared. This will influence the Vertical-scroll-mode ScrollViewer inside of it.
A ScrollViewer works when its content's size bigger than the ScrollViewer's size, when a ScrollViewer is inside of a StackPanel, it has no limit of size, the size will fit the child inside of it, so can't a ScrollViewer work correctly.
In this case, you can change the StackPanel outside of your Pivot to Grid, it will solve the problem, or you can give your ScrollViewers a limit height like <ScrollViewer VerticalScrollMode="Enabled" Height="300">, this can also solve the problem.
<DataTemplate>
<ScrollViewer>
<Grid>
... same rows and controls 20% of screen
</Grid>
<ListView>
</ListView>
</ScrollViewer>
</DataTemplate>
With this template there are
fixed Grid first
scrollable ListView second
How create template with
scrollable ListView at top
fixed Grid at bottom
?
P.S. There are online or compiled demo different xaml layout/templates?
Don't put a ListView inside a ScrollViewer because you will lose virtualization if you are using it, which will degrade performance significantly.
If you want the Grid to always be visible then use the following:
<DataTemplate>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<ListView Grid.Row="0"/>
<Grid Grid.Row="1" Height="100"/> <!-- Set any fixed height -->
</Grid>
</DataTemplate>
If you want the Grid to scroll with the list use a Footer:
<DataTemplate>
<ListView>
<ListView.Footer>
<!-- Set any fixed height -->
<Grid Height="100"/>
</ListView.Footer>
</ListView>
</DataTemplate>
I have an Image control bound to a source. Here is what I want:
If the source image is smaller than the Grid containing it, it should display at its original size. It should not stretch beyond 100%. This is behavior of setting Stretch="None".
If the source image is larger than parent Grid, it should be resized uniformly to fit the container. This behavior is available with Stretch="Uniform".
I have tried to bind MaxWidth and MaxHeight to parent's actual dimensions as follows:
<DataTemplate x:Key="ImageDataTemplate">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<TextBlock Text="{Binding Title}" Grid.Row="0"/>
<TextBlock Text="{Binding Type}" Grid.Row="1"/>
<Grid x:Name="ImageWrapper" Grid.Row="1" Tapped="ImageWrapper_Tapped" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Background="AliceBlue">
<Image Source="{Binding Link}" MaxWidth="{Binding ActualWidth, ElementName=ImageWrapper}" MaxHeight="{Binding ElementName=ImageWrapper, Path=ActualHeight}"/>
</Grid>
</Grid>
</DataTemplate>
However, I just end up with no image at all. Parent Grid occupies all available space as can be seen from background color. But there's no image.
Is there a way to achieve behavior I want?
Put the Image in a Viewbox control and set the Viewbox's StretchDirection to DownOnly. The Stretch property of the Viewbox has a default value of Uniform, so you don't need to set it.
<Viewbox StretchDirection="DownOnly">
<Image Source="{Binding Link}" Stretch="None"/>
</Viewbox>
Perhaps worth to note, in WPF you could directly set the StretchDirection of the Image control, and thus would not need a Viewbox.
<Image Source="{Binding Link}" StretchDirection="DownOnly"/>
I have a Pivot control in my Windows Phone Mango application and one the pivot items has a listbox. It works perfectly when I have only a ListBox as content of the PivotItem.
<controls:PivotItem Header="Item1">
<ListBox
x:Name="longListBox"
ItemsSource="{Binding AllItems}"
Margin="12, 0, 12, 0" Width="440"
ItemTemplate="{StaticResource ItemTemplate}" />
</controls:PivotItem>
Now I would like to add more controls above the list in the PivotItem, say an Image.
<controls:PivotItem Header="Item1">
<StackPanel>
<Image
Source="/Images/header.png"
Height="48"
Width="48"/>
<ListBox
x:Name="longListBox"
ItemsSource="{Binding AllItems}"
Margin="12, 0, 12, 0" Width="440"
ItemTemplate="{StaticResource ItemTemplate}" />
</StackPanel>
</controls:PivotItem>
However, with these changes PivotItem vertical scrolling works very strangely, moving listbox items downwards instead of upwards. Essentially, items on the bottom of the ListBox are not accessible.
I've tried setting StackPanel height to some huge number, tried adding ScrollViewer, but can't get it to work.
How can I fix the scrolling problem?
StackPanel gives its children whatever height/width they ask for, and that makes the inner ListBox miscalculates its actual height and then its ScrollViewer won't work properly.
Try changing the StackPanel to a Grid with two rows and it should work.
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition/>
</Grid.RowDefinitions>