Windows Phone 7. I have a ScrollViewer inside a StackPanel inside a PivotItem inside a Pivot. Above the ScrollViewer, there are some other controls. My intention is that the ScrollViewer takes the available lower part of the screen (~400px), and its content is scrolled vertically (content height ~800px).
Now, right now there's no vertical scrolling - when I try to drag, the view returns in the previous position, as if the viewport size exactly matches the content size. When I look at the ViewportHeight property, it's ~800px - same as content.
Height of the ScrollViewer is not set ("Auto"); I was assuming it would take exactly the available space. That's obviously not the case. Question - short of setting Height by hand, is there a way to implement the logic of "viewport height is exactly how much vertical space you've got left"?
EDIT: here's the XAML, irrelevant details removed:
<Pivot x:Name="Root">
<ctls:PivotItem>
<ctls:PivotItem.Header>Title</ctls:PivotItem.Header>
<StackPanel>
<!-- More stuff here-->
<ScrollViewer Name="MenuPanel" HorizontalScrollBarVisibility="Disabled">
<Canvas x:Name="Menu" HorizontalAlignment="Left" VerticalAlignment="Top">
</Canvas>
</ScrollViewer>
</StackPanel>
</ctls:PivotItem>
</Pivot>
Width and height of the canvas are set in code.
Two things:
A StackPanel doesn't allow it's children to automatically take up the rest of the space available. Use a Grid, instead, with defined Rows. This allows your ScrollViewer to be in a container which is the exact height remaining vertically.
Your Canvas (inside the ScrollViewer) is aligned to top and left, and without a size defined, is exactly 0 pixels high and 0 pixels wide.
Good luck.
<Pivot x:Name="Root">
<ctls:PivotItem>
<ctls:PivotItem.Header>Title</ctls:PivotItem.Header>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition/>
</Grid.RowDefinitions>
<Grid Grid.Row="0">
<!-- More stuff here-->
</Grid>
<ScrollViewer
Grid.Row="1"
Name="MenuPanel">
<Canvas x:Name="Menu"
Height="500"
Width="500"/>
</ScrollViewer>
</StackPanel>
</ctls:PivotItem>
</Pivot>
Without seeing your XAML this is assummed - but based on commonly seen issues
The ScrollViewer is actually being assigned all the space it needs to include all it's content items.
Either give it an absolute height or wrap it in a Grid, which will limit it to the available space within the StackPanel.
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.
How would one create this layout?:
The idea is to keep the blue text always just below the green element BUT when there is not enough space, the green element should be placed inside a scrollable container (with vertical scrollbar visible).
I have tried StackPanel and Grid and both failed. The StackPanel does not shrink rows at all. The Grid does the same if the top RowDefinition's height is set to "auto" (the ScrollViewer inside does not show its scrollbar). If it's set to a star, the blue text is moved down to at least half of the space (depends of the bottom row's height setting). The bottom row's height can be either an "auto" or a star with VerticalAlignment of the blue text set to Top BUT the row's height must be kept at least as big as the text's. Of course the whole area (black box) cannot be stretched by its content - it's determined by the size of the window.
How? Please keep the responses to be based on XAML if possible.
Inspired by Eirik's approach of constraining a greedy container by putting it inside other tight container, I've discovered a really simple way to achieve what I wanted. I only needed a container that shrinks its one child first, then (when the first one completely disappears) the second one. And there is such container: the DockPanel. Here goes:
<DockPanel LastChildFill="False">
<DockPanel DockPanel.Dock="Top">
<TextBlock DockPanel.Dock="Bottom" TextWrapping="Wrap" Grid.Row="1">Automatically wrapped text of unknown length.</TextBlock>
<ScrollViewer>
<TextBlock TextWrapping="Wrap">In this case the element is too big to fit inside whole space (the black box) with the blue text below. I want the scrollbar to be shown instead of moving the blue text outside of the black box (and clipped)</TextBlock>
</ScrollViewer>
</DockPanel>
</DockPanel>
As simple as that! :) I hope it helps someone.
<Grid Name="outerGrid">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
</Grid.RowDefinitions>
<Canvas>
<Grid MaxWidth="{Binding ElementName=outerGrid, Path=ActualWidth}" MaxHeight="{Binding ElementName=outerGrid, Path=ActualHeight}">
<Grid.RowDefinitions>
<RowDefinition Height="*"></RowDefinition>
<RowDefinition Height="Auto"></RowDefinition>
</Grid.RowDefinitions>
<ScrollViewer Width="{Binding ElementName=outerGrid, Path=ActualWidth}">
<TextBlock TextWrapping="Wrap">In this case the element is too big to fit inside whole space (the black box) with the blue text below. I want the scrollbar to be shown instead of moving the blue text outside of the black box (and clipped)</TextBlock>
</ScrollViewer>
<TextBlock TextWrapping="Wrap" Grid.Row="1">Automatically wrapped text of unknown length.</TextBlock>
</Grid>
</Canvas>
</Grid>
The auto height will grow to match the height of the content of that row.
The star height will let that row grow in height to fill the rest of the height of the grid, preventing the ScrollViewer to grow more than what's visible.
Edit: If you put the Grid inside another Grid like the XAML above you should get the behavior you want.
The second row of the outer row acts as a "filler" to fill the rest of the space the outer Grid.
Edit 2: Try the edited XAML above. I've put the inner Grid inside a Canvas (to prevent clipping) and bound the MaxWidth and MaxHeight of the inner Grid to the ActualWidth and ActualHeight of the outer Grid to keep the inner Grid the same size as the outer Grid.
Edit 3: Added binding to the Width of the ScrollViewer to keep it the same width as the rest.
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.
I am very new to WPF and am trying to understand the DockPanel control. I am building a Window, and am using a DockPanel in order to dock controls the way I want them. However, is it possible to dock the DockPanel itself, say to the top of the Window? I can't seem to find a way to do this. Ideally I would like to have the DockPanel dock itself to the top of my Window so that when the Window is resized, it grows or shrinks as the window is resized horizontally.
The problem is I cannot find a Doc property on the DockPanel itself. Is this not possible to do?
You would need to place it within another DockPanel if you wished to dock it.
That being said, my experience has been that when a layout gets to the level of complexity you are describing, it's often better to switch to using a Grid control. This gives you a huge amount of control over layout, and makes having dynamically growing rows/columns (with fixed size portions between) easy.
Edit in response to comments:
You can use a Grid that scales as needed. For example, by using star syntax, you can have a grid where the top row is always 1/3rd of the window size, and the bottom row is 2/3rds, like so:
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="2*" />
</Grid.RowDefinitions>
</Grid>
For details on options for sizing, see GridLength. You can use "Auto" (fit to contents), "*" to scale based on space, or a fixed height (put in a number).
I'm not sure if this what you want but I have a DockPanel with a Menu. When I resize the window the menu resizes with it.
Here is my code:
<Grid>
<DockPanel Height="50" Margin="0" Name="MenuDockPanel" VerticalAlignment="Top" Width="Auto">
<Menu Height="23" Name="MenuPanel" Width="Auto" VerticalAlignment="Top">
<MenuItem Header="_File">
</Menu>
</DockPanel>
<Grid>
Hope this helps
At moment my main layout consists of vertically oriented stack panel and it looks like this:
Root StackPanel
StackPanel - fixed Height 150
(horizontal orientation)
StackPanel - relative Height must be
behalf of free space left on screen
(but at least 150 px). Used by Telerik
GridView Control, if I don't specify Height or MaxHeight Telerik GridView Height becomes very large and does not fit my window.
StackPanel - fixed Height 100
(horizontal orientation)
StackPanel - relative Height must be
half of free space left on screen
(but at least 150 px). Used by Telerik
GridView Control, if I don't specify Height or MaxHeight Telerik GridView Height becomes very large and does not fit my window.
StackPanel - fixed Height 100
(horizontal orientation)
The view must totally fit available screen size.
The problem is that I don't understand how to make certain areas of my view resize depending on available screen size.
Is there is easy way to solve it, or should I be binding to Window height property and doing math?
Thank You very much!
I dont have the telerik controls to hand to test so this is off the top of my head - can you not use a grid as the basis of your control rather than a stackpanel like this? - if this is still a problem then post some code up and we can take a look at what you are trying to achieve.
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="150"/>
<RowDefinition Height="*"/>
<RowDefinition Height="100"/>
<RowDefinition Height="*" />
<RowDefinition Height="100"/>
</Grid.RowDefinitions>
<StackPanel Grid.Row="0" />
<StackPanel Grid.Row="1" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" />
<StackPanel Grid.Row="2" />
<StackPanel Grid.Row="3" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" />
<StackPanel Grid.Row="4" />
</Grid>