Ok I have a contentpresenter inside a grid cell:
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition></RowDefinition>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition></ColumnDefinition>
</Grid.ColumnDefinitions>
<WrapPanel Grid.Row="0" Grid.Column="0">
<RadioButton GroupName="a" IsChecked="{Binding Path=SpecifyRatedValues, Mode=TwoWay}">Specify</RadioButton>
<RadioButton GroupName="b" IsChecked="{Binding Path=SpecifyRatedValues, Converter={StaticResource invertBoolean}}">Auto generate</RadioButton>
</WrapPanel>
<Border BorderBrush="Black" BorderThickness="3" Grid.Row="1" Grid.Column="0">
<ContentPresenter Content="{Binding Path=RatedValues}"></ContentPresenter>
</Border>
</Grid>
The contentpresenter finds which UI element to use by the datatemplate defined under resources:
<DataTemplate DataType="{x:Type ViewModels:RatedValuesViewModel}">
<Views:RatedValuesView />
</DataTemplate>
Now, everything works as expected, except for one thing: the View which is placed inside the contentpresenter at runtime does not expand to fill the entire cell. It leaves a big margin on the left and right side.
How can I make the view inside the contentpresenter fill the entire available area?
HorizontalAlign="Stretch" and VerticalAlign="Stretch" are important; however, you also have to remember how Grids work. Grid units are either in absolute pixels, "Auto", which means they size to fit their contents (i.e. minimum size to show everything), or "stars" which means fill up all available space.
Set your second RowDefinition's height to "*". You may also want to set easily-distinguishable border brushes and thicknesses on your grid. Sometimes, it's easy to think X isn't filling up all the available space, when it's really X's container, or X's container's container that isn't filling up the space. Use bright primary colors and large thicknesses (3 or so) and you can tell quickly who's not filling things up.
Chaiguy got it! The View had an explict Width and Height which constrained the view when placed in the cell. Thanks :-)
You must set HorizontalAlign=Stretch, VerticalAlign=Stretch to both Border and Content Presenter to fill the space in grid. and make width=auto.
Related
Im relatively new to WPF so I'm sorry in advance if there is a simple solution to this. However, I am trying to bind the height of a StackPanel to its containing Grid. I understand that a StackPanel automatically resizes to fit its elements but I would like to bind it to the Grid so that it does not do this. Right now the stack panel does not resize with the window since it remains the
size it needs to be in order to fit its elements.
Here is what I have so far:
<Grid x:Name="MainGrid" Grid.Row="2" Margin="1" Drop="Grid_Drop"
AllowDrop="True">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="175"/>
<ColumnDefinition Width="5"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<StackPanel x:Name="SidePanel" Grid.Column="0" Height="{Binding
ActualHeight, ElementName=MainGrid, Mode=OneWay}">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition/>
</Grid.RowDefinitions>
<local:DeviceTreeView x:Name="deviceTree" PyngInfo="{Binding
PyngSystemVm.PyngInfo}" Grid.Row="0"/>
</StackPanel>
<-- There is more code here but it is not important for answering this
question -->
</Grid>
I tried binding the height of "SidePanel" to the actual height of "MainGrid" but when I run this code and inspect the elements the Grid resizes with the window but the StackPanel does not. The StackPanel and the Grid even have different heights which doesn't make sense to me as their heights should be bound together.
I have also tried wrapping the entire StackPanel in a border and binding to that but that also did not work.
You don't need to bind the height of the StackPanel, simply setting its VerticalAlignment to Stretch will do it. However... You are still not going to get what I think you want. The StackPanel only stacks its child controls, it does not adjust them (at least not in the "stack" direction). Look into using a different control like Grid or UniformGrid or just expand your existing grid to have rows as well as columns.
I have learned that if the height of a grid row, where the ScrollViewer resides, is set as Auto, the vertical scroll bar will not take effect since the actual size of the ScrollViewer can be larger than the height in sight. So in order to make the scroll bar work, I should set the height to either a fixed number or star height
However, I now have this requirement, that I have two different views reside in two grid rows, and I have a toggle button to switch between these two views: when one view is shown, the other one is hidden/disappeared. So I have defined two rows, both heights are set as Auto. And I bind the visibility of the view in each row to a boolean property from my ViewModel (one is converted from True to Visible and the other from True to Collapsed. The idea is when one view's visibility is Collapsed, the height of the grid row/view will be changed to 0 automatically.
The view show/hidden is working fine. However, in one view I have a ScrollViewer, which as I mentioned doesn't work when the row height is set as Auto. Can anybody tell me how I can fulfill such requirement while still having the ScrollViewer working automatically`? I guess I can set the height in code-behind. But since I am using MVVM, it would require extra communication/notification. Is there a more straightforward way to do that?
In MVVM, the way that worked for me was to bind the height of the ScrollViewer to the ActualHeight of the parent control (which is always of type UIElement).
ActualHeight is a read-only property which is only set after the control has been drawn onto the screen. It may change if the window is resized.
<StackPanel>
<ScrollViewer Height="{Binding Path=ActualHeight,
RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UIElement}}">
<TextBlock Text=Hello"/>
</ScrollViewer>
</StackPanel>
But what if the parent control has an infinite height?
If the parent control has an infinite height, then we have a bigger problem. We have to keep setting the height of all parents, until we hit a control with a non-infinite height.
Snoop is absolutely invaluable for this:
If the "Height" for any XAML element is 0 or NaN, you can set it to something using one of:
Height="{Binding Path=ActualHeight, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UIElement}}"
VerticalAlignment="Stretch"
Height="Auto"
Hint: Use VerticalAlignment="Stretch" if you are a child of a Grid with a <RowDefinition Height="*">, and the Binding RelativeSource... elsewhere if that doesn't work.
If you're interested, here is all of my previous attempts to fix this issue:
Appendix A: Previous Attempt 1
Can also use this:
Height="{Binding Path=ActualHeight, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=StackPanel}}"
Appendix B: Previous Attempt 2
Useful info: see Auto Height in combination with MaxHeight.
If nothing seems to work, it's probably because the ActualHeight of the parent is either 0 (so nothing is visible) or huge (so the scrollviewer never needs to appear). This is more of a problem if there are deeply nested grids, with a scrollviewer right at the bottom.
Use Snoop to find the ActualHeight of the parent StackPanel. In properties, filter by the word "Actual", which brings back ActualHeight and ActualWidth.
If ActualHeight is zero, give it a minimum height using MinHeight, so we can at least see something.
If ActualHeight is so huge that it goes off the edge of the screen (i.e. 16,000), give it a reasonable maximum height using MaxHeight, so the scrollbars will appear.
Once the scrollbars are appearing, then we can clean it up further:
Bind the Height of the StackPanel or Grid to the ActualHeight of the parent.
Finally, put a ScrollViewer inside this StackPanel.
Appendix C: Previous Attempt 3
It turns out that this can sometimes fail:
Height="{Binding Path=ActualHeight, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=StackPanel}}"
The reason? It the binding fails, the height will be zero and nothing will be seen. The binding can fail if we are binding to an element which is not accessible. The binding will fail if we are going up the visual tree, then down to a leaf node (e.g. up to the parent grid, then down to the ActualHeight of a row attached to that grid). This is why binding to the ActualWidth of a RowDefinition simply won't work.
Appendix D: Previous Attempt 4
I ended up getting this working by making sure that Height=Auto for all of the parent elements from us to the first <Grid> element in the UserControl.
Change Height from Auto to *, if you can.
Example:
<Window x:Class="WpfApplication3.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="200" Width="525">
<StackPanel Orientation="Horizontal" Background="LightGray">
<Grid Width="100">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<ScrollViewer VerticalScrollBarVisibility="Auto" x:Name="_scroll1">
<Border Height="300" Background="Red" />
</ScrollViewer>
<TextBlock Text="{Binding ElementName=_scroll1, Path=ActualHeight}" Grid.Row="1"/>
</Grid>
<Grid Width="100">
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<ScrollViewer VerticalScrollBarVisibility="Auto" x:Name="_scroll2">
<Border Height="300" Background="Green" />
</ScrollViewer>
<TextBlock Text="{Binding ElementName=_scroll2, Path=ActualHeight}" Grid.Row="1"/>
</Grid>
</StackPanel>
</Window>
I've had similar problem, taking me hours to figure out the solution. What solved it was using a Dockpanel as parent container instead of a StackPanel. Just specify all children to dock to top if the functionality should be similar to vertical stackpanel. Consider using LastChildFill="False" in the Dock XAML which is'n default.
So instead of:
<StackPanel Orientation="Horizontal">
<Textbox>SomeTextBox</Textbox>
<Scrollviewer/>
</StackPanel>
Try:
<DockPanel LastChildFill="False">
<Textbox DockPanel.Dock="Top">SomeTextBox</Textbox>
<Scrollviewer DockPanel.Dock="Top"/>
</DockPanel>
You can either set a fix height on your ScrollViewer but then you have to consider that the second row of your grid will have that height too since row's first child will be the ScrollViewer and row's height is auto, or you bind the height of ScrollViewer to another control in your layout. We don't know how your layout looks alike.
At the end if you don't like neither of both just set the row's height to * as swiszcz suggested or hack wpf write your own custom panel that will be able to layout everything possible in every parallel universe or something like that. :)
What I discover is that you have to put your ScrollViewer within a container that has Height=Auto or you get his parent Heigh Actual Size and apply it to that container.
In my case I have UserControl like
<Grid Margin="0,0,0,0" Padding="0,2,0,0">
<ScrollViewer Height="Auto" ZoomMode="Disabled" IsVerticalScrollChainingEnabled="True" VerticalAlignment="Top"
HorizontalScrollMode="Enabled" HorizontalScrollBarVisibility="Disabled"
VerticalScrollMode="Enabled" VerticalScrollBarVisibility="Visible">
<ListView ItemsSource="{x:Bind PersonalDB.View, Mode=OneWay}" x:Name="DeviceList"
ScrollViewer.VerticalScrollBarVisibility="Hidden"
ItemTemplate="{StaticResource ContactListViewTemplate}"
SelectionMode="Single"
ShowsScrollingPlaceholders="False"
Grid.Row="1"
Grid.ColumnSpan="2"
VerticalAlignment="Stretch"
BorderThickness="0,0,0,0"
BorderBrush="DimGray">
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<ItemsStackPanel AreStickyGroupHeadersEnabled="False" />
</ItemsPanelTemplate>
</ListView.ItemsPanel>
<ListView.GroupStyle>
<GroupStyle>
<GroupStyle.HeaderTemplate>
<DataTemplate x:DataType="local1:GroupInfoList">
<TextBlock Text="{x:Bind Key}"
Style="{ThemeResource TitleTextBlockStyle}"/>
</DataTemplate>
</GroupStyle.HeaderTemplate>
</GroupStyle>
</ListView.GroupStyle>
</ListView>
</ScrollViewer>
</Grid>
And I add it dinamically to ContentControl which is within a Page.
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Margin="0,0,12,0">
<Grid.RowDefinitions>
<RowDefinition Height="70" />
<RowDefinition Height="*" MinHeight="200" />
</Grid.RowDefinitions>
<Grid Grid.Row="1" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" >
<ContentControl x:Name="UIControlContainer" />
</Grid>
</Grid>
Notice that Heigh of the Row is *
When I populate ContentControl I use this code in Loaded event
UIControlContainer.Content = new UIDeviceSelection() {
VerticalAlignment = VerticalAlignment.Stretch,
HorizontalAlignment = HorizontalAlignment.Stretch,
Height = UIControlContainer.ActualHeight,
Width = UIControlContainer.ActualWidth
};
And also when ContentControl changes its size you have to update size of the UserControl.
UIControlContainer.SizeChanged += UIControlContainer_SizeChanged;
private void UIControlContainer_SizeChanged(object sender, SizeChangedEventArgs e)
{
if (UIControlContainer.Content != null)
{
if (UIControlContainer.Content is UserControl)
{
(UIControlContainer.Content as UserControl).Height = UIControlContainer.ActualHeight;
(UIControlContainer.Content as UserControl).Width = UIControlContainer.ActualWidth;
}
}
}
Enjoy!
P.S. Acctually I did it for UWP.
I've tried almost every combination of alignments and margins, to no success. The ListBox is on a WPF page, which is bound to a frame on the main window.
The ListBox itself is fine. It aligns just as I expect it would. My ListBoxItem contains an Image and a TextBlock. The TextBlock gets cut off.
As you can see from the following image, things are mostly good.
The ListBox is appropriately offset from the left edge and the top of that blue box. The content Image and TextBlock are fairly centered and so is the ListBoxItem outline. This is on my development machine.
I thought the whole reason for using grids, grid lines, and alignment properties, was so we didn't have to set a hard coded size. That our controls would resize themselves. Which does actually work just fine for everything else.
But when I place this on a small screen, I get this:
The ListBox itself is still aligned correctly. But now the ListBoxItem is forced down. It's top alignment is still good, but the bottom is pushed down so we can't see the TextBlock or the bottom of the ListBoxItem.
Here's my XAML:
<Grid VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Margin="1">
<Grid.RowDefinitions>
<RowDefinition Height="292*" />
<RowDefinition Height="30*"/>
</Grid.RowDefinitions>
<ListBox Grid.Row="1" Name="lbButtons" Margin="2,0,0,1.5" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Visibility="Visible" >
<StackPanel Name="spListBoxItems" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Orientation="Horizontal">
<ListBoxItem Margin="0,0,0,0" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" >
<StackPanel Orientation="Vertical" HorizontalAlignment="Center" Margin="10,5,10,5">
<Image Source="/COBAN.CobanConsole.UI;component/Images/Buttons/Light/record48_light.png" />
<TextBlock Text="Record" Margin="5,5,0,0"></TextBlock>
</StackPanel>
</ListBoxItem>
</StackPanel>
</ListBox>
</Grid>
Not much to it. Any ideas on what's going on?
You're using * units on your grid row definitions. Those are relative measures: they just tell you what proportion of the space the rows can take up. If you need your listbox to have a specific height, you should change your second row to have an absolute size instead, like this:
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="30"/>
</Grid.RowDefinitions>
My application UI is divided in 2 parts. Left side is Navigation Menu and Right is View Area where the selected Menu content is displayed. Now, one of the menu is reports. I am using Tabcontrol with Header and Content Template. Template has a ViewModel as DataType and content as the respective View which is a UserControl. This TabControl is inside a scrollviewer which is set as horizontal and vertical alignment to stretch.
The user control hosts a ContentPresenter inside a Grid which is bound to a ReportHost which has a reportviewer as child. I am using this ReportViewer to generate reports.
When the user opens a report, it opens in a new tab. It works fine till the number of tabs is such that the tabheaders are contained inside the viewing area. But as soon as more tabs are added, it causes the tabcontrol width to stretch, causing the content area of the tab to stretch and the contentpresenter also stretches causing horizontal scroll to appear.
This finally result in the report to stretch and due to some reason, unknown to me, the report overlaps the Navigation Area of the UI, as if it is not a part of the UI but is overlapping it. The whole report keeps on floating on top of the View Area and Navigation menu on scrolling.
I can fix it by providing the MaxWidth to the ScrollViewer but I don't want to do that. I would like the width of the tabcontroll or the Scrolviewer to be decided purely based on available View Area. How do I do this through the code or XAML without using fixed width.
I am not sure if I was able to explain the situation. Please let me know if more information or clarification is needed. I would be more than happy to provide details.
Edit: Adding Code for information.
<DataTemplate x:Key="TabContent" DataType="{x:Type VM:ReportViewModel}">
<View:Report/>
</DataTemplate>
<DataTemplate x:Key="TabHeader" DataType="{x:Type VM:ReportViewModel}">
<ContentPresenter Content="{Binding Path=TabHeader}"
VerticalAlignment="Center"/>
</DataTemplate>
<ScrollViewer HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto">
<Grid HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<TextBlock HorizontalAlignment="Left" TextWrapping="Wrap"
Text="Reports" VerticalAlignment="Top" Margin="10,13,0,0"
FontSize="18.667" FontFamily="Segoe UI" Foreground="White"/>
<Border BorderThickness="0" Margin="0,50,0,0"
Background="{DynamicResource Brush_HeaderNew}" Height="50" Width="Auto"
VerticalAlignment="Top"/>
<TabControl ItemsSource="{Binding ReportItems}" Grid.Row="1" Margin="0,20,0,0"
SelectedItem="{Binding SelectedReportItem}"
ContentTemplate="{StaticResource TabContent}"
ItemTemplate="{StaticResource TabHeader}"
/>
</Grid>
</ScrollViewer>
ScrollViewer presents to its child an infinitely large area on which to set itself out, because it reasons that it can just offer scrolling if it's bigger than the space available to ScrollViewer itself. Because yours has scrolling enabled in both directions, that means the TabControl can expand as much as it likes in either direction, and it's not going to be smart enough to know that it's inside a ScrollViewer and that you want the tabs to not take advantage of this virtual space.
From the sound of things, you might want to consider moving the ScrollViewer within the TabControl so that only the contents of the tab is scrollable rather than the whole set. You should be able to do that by modifying the tab content template.
edit: I'm rewriting almost the entire question because I realized the question was incorrect and confusing. I apologize for this, but the question had incorrect assumptions that made it impossible to answer. I originally tried to simplify it to make it easier to understand, but this made it impossible to replicate my problem.
If I have an DataGrid with a MinHeight in a ScrollViewer, I would expect that as my ViewPort shrinks, the ActualHeight of the element would be decreased until it hits MinHeight before the scrollbars show up.
Instead, it seems that when the datagrid's rows cumulative heights add up to more than the MinHeight, this value overrides MinHeight
Is there a way to do this without manually sizing everything and having a ton of code?
Example:
<ScrollViewer VerticalScrollBarVisibility="Auto" Background="Red">
<Grid x:Name="LayoutRoot" Background="Black" HorizontalAlignment="Stretch">
<Grid.RowDefinitions>
<RowDefinition MinHeight="20"/>
<RowDefinition Height="80"/>
</Grid.RowDefinitions>
<sdk:DataGrid AutoGenerateColumns="True" Name="dataGrid1" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" MinHeight="20" />
<Rectangle Fill="Blue" Width="100" Height="80" Grid.Row="1" />
</Grid>
</ScrollViewer>
If you were to populate this grid with some rows, if you maximize the window, the grid takes up most of the space and has white space after the rows. If you shrink it down, the layout takes away from the white space until that space runs out, then the root level ScrollViewer kicks in, even though MinHeight has not been reached.
If you replace the DataGrid with another rectangle, the behavior is different (obviously). The new rectangle would shrink down to height 20.
How do I achieve this with the grid? My requirements are to have nested scrollbars on my SL page (which I find distasteful, but it's not in my control). The idea is that the top level scrollbars are a "last resort" of sorts.
What about this:
<ScrollViewer>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="250" />
</Grid.RowDefinitions>
<Rectangle MinHeight="150" Background="Red" Grid.Row="0" />
<Rectangle Height="250" Background="Blue" Grid.Row="1" />
</Grid>
You did not have the Grid.Row values set on either of the rectangles.
You've not provided sufficient information to solve your specific problem. However, it is easy to demonstrate that the ScrollViewer does work in exactly the fashion you desire by distilling down to something as simple as:
<UserControl ...>
<ScrollViewer VerticalScrollBarVisibility="Auto">
<Border MinHeight="200" BorderBrush="Blue" BorderThickness="1" Background="Red"/>
</ScrollViewer>
</UserControl>
Put this in a standalone Silverlight application in the main page and you'll see that the ScrollViewer only displays the vertical scroll bar when the window is small enough. You can download the solution here.
This is because ScrollViewer itself has a border and padding that occupies little space of its own. Try considering little extra height that should match space of scrollbar border.
Another option will be to change the control template of scrollviewer and remove the border and extra space occupied around content presenter. And set horizontal scroll visibility to collapsed so it will not occupy space.