Could someone answer me the question about listview?
I have variable MyDatas which is collection of listview (and it works):
<ListView
x:Name="lstView"
HasUnevenRows="True"
ItemsSource="{Binding MyDatas}"> ...
Next I have (part of my code but is enough for explaining the problem):
<Label Grid.Row="0"
Grid.Column="1"
Text="{Binding E1}"
FontSize="{Binding FProp.Size1}"
FontAttributes="{Binding FProp.Atrib1}"/>
E1 is a field of MyDatas and this binding works correct. I have property of fonts in another variable FProp (FProp.Size1 and FProp.Atrib1) and this is problem! How can I use this another variable in this listview?
If FProp is used outside of listview all is ok, if I use it in listview it does not work.
Thank you for help
I believe you are not binding correctly the font size.
You are referencing a property named Size1 inside the object FProp which is not in your current binding context. The main problem is that you can only have one binding context per object. So, you should include the Size1 and Atrib1in your MyDatas object in order to make it available for the label. Another option is to change the binding context of the listview to point to FProp then you could access the values on the labels, but you will lose access to the E1 value. So you will need to choose how to fix this problem depending on the options provided.
You could add an x:Name to your ListView, let's say listView1 and use something like this
{Binding Path=BindingContext.FProp.Size1, Source={x:Reference listView1}}
Related
I am trying to get a RichEditBox to take over the entire width of the app window and to be responsive to window resizing, so far the code I have is the following:
<RichEditBox HorizontalAlignment="Stretch"
TextWrapping="WrapWholeWords"
Height="250"
Name="Intro"/>
What I am getting from the code above is this:
Any ideas on how can I get this to work? Why is it that I tell the text to wrap and it doesn't follow?
UPDATE
I also tried this:
<RichEditBox HorizontalAlignment="Stretch"
Height="250"
Name="Intro"/>
But the result is:
The problem that I am having is that it seems that HorizontalAlignment="Stretch" does not really do anything. The only way I am able to set a decent width is by hard-coding it, for example: Width="600". But if I do this my UI will not respond correctly to resizing. I also tried HorizontalContentAlingment="Stretch" but the result is exactly the same.
How can I get my RichEditBox take up all the available Width and Wrap at the same time?
If you look at the documentation of RichEditBox.TextWrapping, you'll notice that WrapWholeWords is invalid. You have to use
<RichEditBox TextWrapping="Wrap"/>
-or-
<RichEditBox TextWrapping="NoWrap"/>
Since Wrap is the default value, you can drop the property.
<RichEditBox HorizontalAlignment="Stretch"
Height="250"
Name="Intro"/>
Edit: in reply to the updated question:
A control only takes the width of it's parent control. Some container controls (e.g. Grid) automatically take the full width available, while others (e.g. StackPanel) only take the required size of it's children. Using HorizontalAlignment="Stretch" in combination with a StackPanel as a parent control, will only use the MinWidth property instead of the full available width on your screen. Sometimes you can't directly see this issue, e.g. when your control is inside an itemtemplate of a ListView. Use the Live Visual Tree in Visual Studio to find the parent containers and locate the issue.
So in short: make sure your RichEditBox is inside a Grid (or similar control) instead of a StackPanel.
I am creating a UWP application and I want a simple check box, no text, for each entry in my ListView. If I add a checkbox control to my template for the listview, I get a big gap after the checkbox for the Content - event when the content is empty.
If I turn on multiselect in the listview so I get a nice checkbox for each row, I can't seem to figure out how to databind the check box for each row in the listview to the Selected property of my ViewModel.
Below is a picture of what I want the area of the check box to look like. This was generated using the SelectionMode="Multiple" on the listview. Remember - the problem with this approach is I can't seem to find a way to bind the check box to the Selected property of my ViewModel class.
Below is what it looks like if I remove the SeletionMode property and add a check box to my ItemTemplate. As you can see there is a huge gap between the check box and the area where the image will be due to the Checkbox control's minimum width of 120.
Any suggestions would be greatly appreciated.
You could just set the MinWidth on the Checkbox itself
eg
<StackPanel Orientation="Horizontal">
<CheckBox x:Name="MyCheck" IsChecked="True" MinWidth="30"/>
<Rectangle Fill="Red" Width="100" Height="50"/>
</StackPanel>
The alternative is creating a copy of the Checkbox Styles and Template but that seems like overkill here.
I'm playing with the "Grid Application," which is a C++ Metro app template provided by VS11. The main display is a collection of items displayed in a VirtualizingStackPanel:
<ScrollViewer x:name="itemGridScrollViewer">
<GridView x:name="itemGridView">
<GridView.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel />
</ItemsPanelTemplate>
</GridView.ItemsPanel>
</GridView>
</ScrollViewer>
The actual items are displayed using the Standard250x250ItemTemplate data template defined in StandardStyles.xaml. One of the display elements of this is a graphic.
I'm trying to understand how to reference a specific item so that I can change the graphic at runtime. The ScrollViewer and the GridView have objects associated with them, so I can get to those, but I don't see how to get from there to the individual items.
All this stuff is completely new to me, so be gentle. :)
In general it's not a good idea to dig down into individual templated items in an ItemsControl because not only is it a pain, but that ItemTemplate can regenerate at different times (paging during virtualization, source collection updates, etc) and you'll be left holding an outdated UIElement that's no longer being displayed.
A better approach is to pull the data you need into the item data and in the ItemTemplate use Data Binding to make whatever changes you need to differentiate the UI. One option is to use an IValueConverter to get a different image depending on some state in the item data:
<GridView>
<GridView.ItemTemplate>
<DataTemplate>
<Image Source="{Binding Path=DataState, Converter={StaticResource MyStateToImageConverter}}"/>
</DataTemplate>
</GridView.ItemTemplate>
</GridView>
Here I'm assuming that the converter code has been written and an instance of the converter has already been declared as a resource (see here). You could alternatively do a direct Binding to a property on each item's data that specifies its image and skip the converter part.
I've created a simple UserControl in Blend which contains (amongst other things) a ContentPresenter.
I'd like to be able to drop this UserControl onto another UserControl and then add other controls into its ContentPresenter, but when I include it in the second UserControl I can't see a way to do this.
Using Blend, how do I expose the underlying ContentPresenter so that its contents can be set visually (ie: so they appear as child controls in the Objects and Timeline window)?
If it’s a content control, to add child controls you set them as the content of the control
<MyContentControl>
<Grid x:Name=”ImAChild”>
</Grid>
</MyContentControl>
Edit: now that I think about it you might need to do something to make the Content property the default property which is populated by the inner xaml of your control, I can't remember exactly what it was but if your xaml looks like this (below) it doesn't matter anyway
<MyContentControl>
<MyContentControl.Content>
<Grid x:Name=”ImAChild”>
</Grid>
</MyContentControl.Content>
</MyContentControl>
Edit2
Your MyUserControl would need a MyContent property of type object and it'd have to somehow display the value of that property. You might be able to create it in the setter of the MyContent property but it seems "hacky"
<MyUserControl>
<MyUserControl.MyContent>
<Grid x:Name=”ImAChild”>
</Grid>
</MyContentControl.MyContent>
</MyUserControl>
I have a silverlight application in which I display items in a list box.
I want to hide some items based on a condition, like some value of a string.
My xaml looks like this:
<ListBox
ItemsSource="{Binding DashboardTypes}"
SelectedItem="{Binding SelectedDashboardCategory,Mode=TwoWay}"
ScrollViewer.HorizontalScrollBarVisibility="Disabled"
Style="{StaticResource ListBoxStyleAttribute}"
Margin="2"
ItemContainerStyle="{StaticResource ListBoxItemStyle}" />
You'll need to set up an ItemTemplate to describe your items and then add a binding on that for the Visibility property that controls when items are visible or not. I suspect that you'll need a converter to actually implement the rule for when an item should be visible.
There is a Stack Overflow question that covers something similar but in WPF. It should give you some pointers that will help you in implementing this.