I have a Listbox that's inside a Grid that's inside a user control. That user control is placed in a tab panel that can resize.
The Listbox is defined as:
<ListBox HorizontalAlignment="Left" Margin="12,42,12,12" Name="listBox1" VerticalAlignment="Top" >
This works great as long as my listbox is populated. When it's not populated, it's a square about 4 pixels wide/tall. If it's not full, it shrinks down to fit whatever is in it.
This is not what I'd like. What I would like is for it to always maintain the margins I've defined. My question is in two parts:
1: Why does it behave the way it does?
2: How do I make it behave the way I want?
Thanks.
Since you're placing this on a Grid control, you should actually use it as intended and create the rows and columns and put your ListBox in the correct cell(s).
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="42" />
<RowDefinition />
<RowDefinition Height="12" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="12" />
<ColumnDefinition />
<ColumnDefinition Width="12" />
</Grid.ColumnDefinitions>
<ListBox x:Name="listBox1"
Grid.Row="1" Grid.Column="1">
</ListBox>
</Grid>
It is maintaining the margins but the margins are outside the listbox itself so only change the positioning of the listbox relative to its container.
I'm not sure how you would like it to appear but could set a minimum width/height.
<ListBox HorizontalAlignment="Left" Margin="12,42,12,12"
Name="listBox1" MinHeight="10" MinWidth="100" VerticalAlignment="Top" />
or just remove the alignment settings
<ListBox Margin="12,42,12,12" Name="listBox1" />
if you want the listbox to fill its container.
Related
In my wpf project I have one main window(Mainwindow.xaml) file and remaining all windows are user controls. If I click any menu of the mainwindow.xaml then the corresponding usercontrols will appear in the mainwindow.xaml form.
My requirement is, when the usercontrol window is resized, I need to resize all controls width (i.e textboxes,comoboxes,..etc). How can I achieve this.
First of all, the components you need to resize dynamically should not have fixed sizes. You should put everithing into Grid and set width/height to "Auto"/"x*"/ Alignment to stretch...
<UserControl ...>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*" />
<ColumnDefinition Width="2*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="2*"/><!--2/5 of total height-->
<RowDefinition Height="3*"/>
</Grid.RowDefinitions>
<TextBlock Grid.Column="1" Grid.Row="1">Text </TextBlock>
<TextBox Grid.Column="2" >Enter</TextBox>
<TextBox Grid.Row="2" Grid.ColumnSpan="2">Button 5 Button 5 Button 5 Button 5</TextBox>
</Grid>
</UserControl>
Main
<Grid Width="Auto" HorizontalAlignment="Stretch">
<ContentControl ..." />
</Grid>
I'm having trouble getting my UserControl to expand vertically when my window is expanded.
My UserControl currently sits inside a ItemsControl which is stretching correctly by setting the VerticalAlignment="Stretch" property on the ItemsControl.
I add the following UserControl to the ItemsControl:
<UserControl MinWidth="930">
<Grid VerticalAlignment="Stretch" Background="Red">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="200" />
<ColumnDefinition Width="730*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="400" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<DockPanel Grid.Column="1" Grid.ColumnSpan="1" Grid.RowSpan="2" Grid.Row="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Background="Pink" LastChildFill="True">
<ItemsControl Name="itemPanelOverview" Grid.Column="1" Background="Black" Margin="0"/>
</DockPanel>
</Grid>
</UserControl>
The UserControl is called in an ItemsControl inside of a TabControl like so:
<TabItem>
<TabItem.Header>
HEADER EG
</TabItem.Header>
<ItemsControl Name="contentItems" Grid.ColumnSpan="2" Grid.Column="1" Grid.Row="1" VerticalAlignment="Stretch" Background="Blue">
<Grid Height="35" Background="{DynamicResource GrayMenuGradient}" >
<Image Source="..." Stretch="None" />
<TextBlock Text="{Binding WelcomeMessage}" />
</Grid>
</ItemsControl>
</TabItem>
It appears that the ItemsControl (contentItems) is stretching as expected, as I can see the blue background stretching correctly.
I haven't set the height for this UserControl anywhere other than the Row Definitions. Is there something I'm missing?
There are at least two aspects at play here:
The first is that when you have items in an ItemsControl, each item is actually inside an ItemContainer, so it is the container that you want to stretch.
You can design the container by declaring an ItemContainerTemplate for your ItemsControl: http://msdn.microsoft.com/en-us/library/system.windows.controls.itemcontainertemplate.aspx
The second consideration is the ItemsPanelTemplate, which determines into what type of panel the items are placed. The ability of the items in the ItemsControl to fill up the available space is going to depend on the type of container as much as on the type of ItemContainer. For example, if you use a StackPanel for the ItemsPanelTemplate, it won't fill up available space because StackPanel grows and shrinks according to its contents. A DockPanel could potentially work, but only the last child would grow to fill available space. Perhaps a UniformGrid could do the trick.
I want to display text in a triangular area. But I cannot figure out how to change the shape of the TextBlock so that text is displayed in triangular region instead of the regular rectangular region.
Here is the simplified code of my UserControl:
<Grid >
<Image Height="100" Width="100" /> <!-- Some triangular image -->
<TextBlock Height="100" Width="100" Text="This text should fill up the triangualr image area"/>
</Grid>
Well kind of an overkill solution but the contents of the inner grid will be triangular in arrangement if something similar is followed:
<Grid>
<Image Height="200" Width="200" />
<Grid Width="200">
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
<ColumnDefinition />
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<TextBlock Grid.Row="0" Grid.Column="2" Grid.ColumnSpan="1" Text="Line 1" HorizontalAlignment="Center"/>
<TextBlock Grid.Row="1" Grid.Column="1" Grid.ColumnSpan="3" Text="This is Line 2." HorizontalAlignment="Center"/>
<TextBlock Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="5" Text="This is Line 3. Wud be longest." HorizontalAlignment="Center"/>
</Grid>
</Grid>
For your reference, The grid is constructed as follows :
Set the background triangular image & I suppose that suffices.
You need to overwrite the TextBox's Template
I would recommend getting a copy of Blend, extracting the TextBox's Template from there, and modifying it to suit your needs.
If you are unable to get Blend, I'd recommend Show Me The Template, which is a WPF tool that shows the default template for most WPF controls
Just overwrite the template of the textbox, like this
<ControlTemplate TargetType="Textbox">
<Path ... define your triangle here>
</ControlTemplate>
and then set the enter property on the textbox to true. also align cont. hor. and vert. alg. that way it is centered in the middle of the triangle. make sure you make the textbox background transparent so it doesn't overwrite the triangle bounds.
also if you don't want to go outside the bounds, put the content presenter inside a viewbox.
you can also look into the clip property.
When I expand the Expander in the code below, the application becomes very sluggish and takes 2-3 seconds to respond to resize/move events triggered by the user. If I set the second column to <ColumnDefinition Width="250"/> response time remains optimal. What am I missing here? (I'm need the UI as per below but without the sluggishness)
<UserControl>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Toolbar .. />
<DataGrid Grid.Row="1" ItemsSource="{Binding collection1}" .. />
<Expander Grid.Column="1" Grid.RowSpan="2">
<DataGrid ItemsSource="{Binding collection2}" .. />
</Expander>
</Grid>
</UserControl>
FYI: I suspect Row Virtualization is not being used when Width=Auto is set and DataGridRow objects are being created for the entire bound data source...
UPDATE
The following also does not remove the sluggishness;
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition Width={Binding ElementName=expander, Path=Width} />
</Grid.ColumnDefinitions>
..
<Expander Name="expander" Grid.Column="1" Grid.RowSpan="2">
<DataGrid ItemsSource="{Binding collection2}" Width="300" .. />
</Expander>
The problem is that if you set the ColumnWidth to Auto, the column width will be calculated depending on the content, here, the dataGrid. So you will have the second column very large (even though you might not see it depending on your layout) and the dataGrid's columns will all be drawn every time.
So basically, you loose the benefits of columnVirtualization (not rowVirtualization).
This is the same reason why you should never put a DataGrid into a ScrollViewer.
Solution
Set VirtualizingStackPanel.IsVirtualizing="True" on your grid
if this does not work, you might have to take care of the resizing yourself, no real option there.
I have a page in which I have a grid with 2 columns, one accommodating 80* width and the other accommodating 20*. Beneath the grid is a stack panel to which I load UI elements (child stack panels) at runtime.
My objective is to bind the widths of the stackpanels to the columns of the grid. This works perfectly and the stackpenels resize if the dynamic content is mocked to be static in the design view. But when the application is run, the bindings fail and the widths are not bound.
Is there any way to refresh the bindings so that I can notify the stackpanels to refer the widths of the grid and configure its's size?
Updated:
This is what my XAML looks like:
<Page x:Class="WPFTestApp.Page1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Page1">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid x:Name="resizeGrid"
Grid.Column="0" Grid.Row="0">
<Grid.ColumnDefinitions>
<ColumnDefinition x:Name="leftColumn"
Width="80*" />
<ColumnDefinition x:Name="rightColumn"
Width="20*" />
</Grid.ColumnDefinitions>
</Grid>
<StackPanel x:Name="contentPanel"
Grid.Column="0" Grid.Row="0" >
<!-- Dynamic StackPanels are added here -->
</StackPanel>
</Grid>
</Page>
In my code, I create StackPanel elements and add it to the contentPanel by saying:
contentPanel.Children.Add(...);
Unfortunately, I HAVE to use StackPanels here. :-(
The markup of a dynamically created StackPanel element is as follows (note that I use a Binding to the grid already in the XAML):
<StackPanel x:Name="element01"
Orientation="Horizontal"
Width="{Binding ElementName=resizeGrid, Path=ActualWidth}" >
<StackPanel x:Name="leftPanel"
Orientation="Vertical"
Width="{Binding ElementName=leftColumn, Path=ActualWidth}">
<!-- Content goes here -->
</StackPanel>
<StackPanel x:Name="rightPanel"
Orientation="Vertical"
Width="{Binding ElementName=rightColumn, Path=ActualWidth}">
<!-- Content goes here -->
</StackPanel>
</StackPanel>
The XAML code for my dynamic StackPanel elements are generated through an XSLT transformation
Note the xmlns:x namespace dynamic StackPanel. This also has to be done because of it being generated through XSLT
As far as I know setting the Width of a StackPanel with Orientation="Horizontal" will have no effect. The size of a StackPanel does not exceed the size of its content in its oriented direction.
Why do you "HAVE" to use StackPanels here? You almost certainly want DockPanels, given your objective. You won't have to bind or set anything, because the DockPanel will fill the cell automatically.
Try binding the ActualWidth instead of Width.
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid x:Name="resizeGrid"
Grid.Column="0" Grid.Row="0">
<Grid.ColumnDefinitions>
<ColumnDefinition x:Name="leftColumn"
Width="{Binding ElementName=contentPanel, Path=ActualWidth}" />
<ColumnDefinition x:Name="rightColumn"
Width="*" />
</Grid.ColumnDefinitions>
</Grid>
<StackPanel x:Name="contentPanel"
Grid.Column="0" Grid.Row="0" HorizontalAlignment="Left" >
<StackPanel Background="Yellow" Width="100" Height="25" />
<StackPanel Background="Green" Width="120" Height="25" />
<StackPanel Background="Red" Width="140" Height="25" />
<TextBlock Background="Gray" Text="{Binding ElementName=contentPanel, Path=ActualWidth}" />
</StackPanel>
</Grid>
The following changes I have done above:
1) Set the leftColumn to the ActualWidth of the contentPanel
2) Set the rightColumn to *
3) contentPanel HorizontalAlignment should be changed other then Stretch. Here I have changed it to Left
HTH
I found a solution for this issue. (Sorry for the late response)
What I did was, I cut and pasted the "resizeGrid" Grid control into the "contentPanel" Stackpanel.
As I mentioned above, the contents within the contentPanel are generated through an XSLT transformation and this surely creates a namespace reference issue. I noticed "element not found..." message in the Output window whenever this Window is loaded - this proved me right.
Inserting the "resizeGrid" into the "contentPanel" helped because then both the controls are within the same namespace and can be referenced for a PropertyBinding using "ElementName" attribute.
Thank you for your support! :-)