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How to get webview2 control in list control

I want to pass the webview2 control on the page to the ViewModel after clicking the button.
The following is part of the code for xaml:
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="auto" />
<RowDefinition Height="auto"/>
<RowDefinition />
</Grid.RowDefinitions>
<StackPanel>
<!--Click the button "Button_single", and the value of parameter can be obtained from ViewModel as Microsoft.Web.WebView2.Wpf.WebView2 type-->
<Button Command="{Binding BtnCommand1}" CommandParameter="{Binding ElementName=webView_single}">Button_single</Button>
<!--Click the button "Button_list", and the value of parameter obtained from ViewModel is null. Why?-->
<Button Command="{Binding BtnCommand1}" CommandParameter="{Binding ElementName=webView_list}">Button_list</Button>
<webview2:WebView2 Name="webView_single" Source="https://www.google.com/" Grid.Row="1">
<behaviour:Interaction.Triggers>
<behaviour:EventTrigger EventName="NavigationCompleted">
<behaviour:CallMethodAction TargetObject="{Binding}" MethodName="webView2_NavigationCompleted" />
</behaviour:EventTrigger>
</behaviour:Interaction.Triggers>
</webview2:WebView2>
</StackPanel>
<ScrollViewer Grid.Row="2" >
<ItemsControl Grid.Row="1" ItemsSource="{Binding AccountDtos}" HorizontalAlignment="Center">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<md:TransitioningContent OpeningEffect="{md:TransitionEffect Kind=ExpandIn}" >
<Grid Width="600" MinHeight="800" MaxHeight="250" Margin="8" >
<Grid.RowDefinitions>
<RowDefinition Height="auto" />
<RowDefinition />
</Grid.RowDefinitions>
<Border CornerRadius="4" Grid.RowSpan="5" Background="#7F7F7F" />
<StackPanel Orientation="Horizontal">
<TextBlock Text="UserName：" />
<TextBlock Padding="5,0" Text="{Binding UserName}" />
<TextBlock Text="Password：" />
<TextBlock Padding="5,0" Text="{Binding Password}" />
</StackPanel>
<webview2:WebView2 Name="webView_list" Source="https://www.google.com/" Grid.Row="1">
<behaviour:Interaction.Triggers>
<behaviour:EventTrigger EventName="NavigationCompleted">
<behaviour:CallMethodAction TargetObject="{Binding}" MethodName="webView2_NavigationCompleted" />
</behaviour:EventTrigger>
</behaviour:Interaction.Triggers>
</webview2:WebView2>
</Grid>
</md:TransitioningContent>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</ScrollViewer>
</Grid>
I want to pass the webview2 control on the page to the ViewModel after clicking the button.
The following is part of the code for xaml:
public DelegateCommand<object> BtnCommand1 { get => new DelegateCommand<object>(Execute1); }
private void Execute1(object parameter)
{
//In the xaml page, if you click the button "Button_single", you can get the parameter value of Microsoft.Web.WebView2.Wpf.WebView2 type
//If you click the button "Button_list", the value of parameter is null. Why and how can it not be null?
Console.Write(parameter);
}
I want to get the webView control in the list control in the ViewModel. How should I write this code?
(This question Passing a Different button in Command Parameter Wpf Similar to my question, but different)

There are two reasons the webView_list commandparameter cannot work.
The first is conceptual. There are going to be a list of those WebView2s rather than just one. How's it supposed to know which one it is to reference?
You know if you have a list of anything in c# then you'd have to reference by index or something which one in the list you want.
The same would be true for xaml. You'd need to tell it to go look at row 0 or 1 or 2 or whatever.
There is another complication though. WPF has the concept of namescopes. All the controls directly in the grid of your window are in the same namescope.
When you have templates and in particular lists of things that becomes a bit more complicated.
Let's think about this from the bottom up though.
You've named a control webView_list. This is in an itemtemplate. So when you have 4 items you will have 4 WebView2s. But it will not error. Somehow those 4 named controls do not collide with one another.
This is because each of those items produced from that itemtemplate have their own namescope. The first item has a namescope of it's own, the second has it's own namescope etc.
You cannot just use elementname to reference something in a different namescope. So you can't get at a specific webview2 in that list using elementname from outside the item it's in.
In any case, you need some way to tell which item.
You could use selecteditem if this was a listbox.
An itemscontrol has no selection though. To get at your webview2 in an item the usual thing to do would be to put the button in the itemtemplate and the same namescope. That could then use relativesource to get to the command in the parent datacontext. Something like:
<ItemsControl.ItemTemplate>
<DataTemplate>
<md:TransitioningContent OpeningEffect="{md:TransitionEffect Kind=ExpandIn}" >
<Grid Width="600" MinHeight="800" MaxHeight="250" Margin="8" >
<Grid.RowDefinitions>
<RowDefinition Height="auto" />
<RowDefinition Height="auto" />
<RowDefinition />
</Grid.RowDefinitions>
<Border CornerRadius="4" Grid.RowSpan="5" Background="#7F7F7F" />
<StackPanel Orientation="Horizontal">
<TextBlock Text="UserName：" />
<TextBlock Padding="5,0" Text="{Binding UserName}" />
<TextBlock Text="Password：" />
<TextBlock Padding="5,0" Text="{Binding Password}" />
</StackPanel>
<Button Command="{Binding DataContext.BtnCommand1, RelativeSource={RelativeSource AncestorType ItemsControl}}"
CommandParameter="{Binding ElementName=webView_list}" Grid.Row="2">Button_list</Button>
<webview2:WebView2 Name="webView_list" Source="https://www.google.com/" Grid.Row="2">
<behaviour:Interaction.Triggers>
<behaviour:EventTrigger EventName="NavigationCompleted">
<behaviour:CallMethodAction TargetObject="{Binding}" MethodName="webView2_NavigationCompleted" />
</behaviour:EventTrigger>
</behaviour:Interaction.Triggers>
</webview2:WebView2>
</Grid>
</md:TransitioningContent>
</DataTemplate>
</ItemsControl.ItemTemplate>

WPF Listbox stretching issues

I have created a UserControl that is suppose to display some text and then present a listbox for the user to select some item.
It is supposed to strech to the height to the grid cell it is placed in. And if there are more items than can fit on screen then to display a vertical scrollbar. After much trial and error I have finally managed to get it working as expected. But only when the row height is a pixel value. If I use any partial (by partial I mean the star symbol), the grid cell's height is not contained. Since I need the app the match screen size I need the partials to work.
Putting 100 items in the listbox suddenly makes the height of the entire grid is around 11000 (which I think is everything with no contraint). Meaning there is no scrollbar. See [Screenshot] https://i.stack.imgur.com/faES9.png.
I have a similar issue with my TextBox only horizontally. It will only activate when clicking on a specific pixel since it is empty the width is only 1 pixel. I hope someone can help me point out where I am going wrong, cause since I'm having more than one issue I suspect the problem is on my end.
This is my XAML code.
<UserControl x:Class="PackingStation.UserControls.SearchItemListing"
x:Name="SearchItemListingRoot"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:PackingStation.UserControls"
mc:Ignorable="d"
d:DesignHeight="1000" d:DesignWidth="1000">
<Grid DataContext="{Binding ElementName=SearchItemListingRoot}"
x:Name="TheGrid"
VerticalAlignment="Stretch">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="1*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height=".1*" />
<RowDefinition Height=".1*" />
<!-- If this value isnt a pixel value it will not vertically strech to available space -->
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<StackPanel HorizontalAlignment="Center"
Margin="0,0,0,0"
x:Name="TheHeadLineField"
Grid.Row="0"
Grid.Column="1">
<Label Style="{StaticResource LabelStyleHeadline32}"
Content="{Binding Title}"
HorizontalAlignment="Left"/>
<Label Style="{StaticResource LabelStyleText}"
HorizontalAlignment="Left"
Content="{Binding SubTitle}"
FontSize="20"/>
</StackPanel>
<!-- Search Field -->
<Border Style="{StaticResource Border6}"
x:Name="TheSearchField"
Grid.Row="1"
Grid.Column="1"
Background="{StaticResource ColorSummaryPanelBackground}"
BorderBrush="{StaticResource ColorSummaryPanelBorder}"
BorderThickness="1"
Margin="0,40,0,0">
<StackPanel Orientation="Horizontal"
Height="78"
HorizontalAlignment="Stretch">
<Image Stretch="Uniform"
Height="24"
Source="pack://application:,,,/WpfUI;component/Icons/Search.png"
Margin="36,0,0,0"
VerticalAlignment="Center"/>
<!-- Search Textbox -->
<!-- Similar issue with this textbox, only horizontally. With no content you have to hit a specific pixel to activate it -->
<TextBox Style="{StaticResource TextBoxSearchInlay}"
Name="TbxSearchTerm"
TextChanged="TextBoxBase_OnTextChanged"
HorizontalContentAlignment="Stretch"
HorizontalAlignment="Stretch"
Margin="20,0,0,0"/>
</StackPanel>
</Border>
<!-- Search results listings -->
<ListBox ItemsSource="{Binding Items}"
x:Name="TheListBox"
Grid.Row="2"
Grid.Column="1"
SelectedItem="{Binding SelectedItem, Mode=TwoWay}"
ScrollViewer.VerticalScrollBarVisibility="Auto"
HorizontalContentAlignment="Stretch"
VerticalContentAlignment="Stretch">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel HorizontalAlignment="Stretch" Margin="0,-10,0,-10">
<Label Style="{StaticResource LabelSearchItem}"
Content="{Binding Name}"
HorizontalContentAlignment="Stretch"
HorizontalAlignment="Stretch"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
</UserControl>

I could repro your problem when I put your UserControl in a StackPanel. When it's in a Grid the ListBox shows its vertical scrollbar. So, try your UserControl in a Grid.
I think this answer will give a good explanation about Grid and StackPanel stretching behavior.

UWP: Control won't fit to the available view area of my Grid cell

I am working on a Phone Dialer UWP application for Windows Mobile devices. In searching for dialer examples, I came across the PhoneCall sample that is bundled with Windows Universal Samples at https://github.com/Microsoft/Windows-universal-samples. The PhoneCall sample contains an example implementation of Dialer and a DialerPanel, complete with a text box to display or edit the number being typed, as well as the Call button. So far so good.
However, the sample dialer panel is hosted as a PivotItem in a tabbed interface implemented by MainPage.xaml, and it occupies the entire space available to it.
What I am looking for is something like a DialerPanel in the sample, but one that could shrink to fit in my Grid cell. I will have the available space split into two Grid cells, with the upper half occupying a custom control or an image, while the lower half will host the Dial Pad.
In my attempt to accomplish what I need, I modified the sample DialerPanel.xaml as follows:
I created a new outer Grid with two rows, each taking up 50% of the available space.
In the upper row, I added a rectangle with a fill of "Light Yellow"
In the lower row, I added the original Dialer Panel layout contained in a Grid (basically, I moved the ORIGINAL Grid into a Grid cell at Row 1, Column 0.
Below is the image of my XAML outline (with certain blocks collapsed for clarity):
Here's the XAML:
<UserControl
x:Class="PhoneCall.Controls.DialerPanel"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:PhoneCall.Controls"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="1*"/>
<RowDefinition Height="1*"/>
</Grid.RowDefinitions>
<Rectangle Fill="LightYellow" Grid.Row="0"/>
<Grid Grid.Row="1">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<StackPanel Grid.Row="0">
<local:LinePicker Margin="0,20,0,0"/>
<Grid Style="{StaticResource DigitViewGridStyle}">
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<ScrollViewer x:Name="dialerNumberControlScrollviewer"
Grid.Column="0"
Style="{StaticResource DigitViewScrollerStyle}">
<TextBlock Style="{StaticResource DigitViewTextStyle}"
SizeChanged="OnDialerNumberControlSizeChanged"
Text="{Binding DialerPhoneNumber.NumberToDial, Mode=OneWay}">
</TextBlock>
</ScrollViewer>
<Button Grid.Column="1"
Command="{Binding ProcessBackspace}"
IsEnabled="{Binding DialerPhoneNumber.DialPadEnabled, Mode=OneWay}"
Holding="OnBackspaceHolding">
<FontIcon FontFamily="Segoe MDL2 Assets" Glyph="" FontSize="30"/>
</Button>
</Grid>
</StackPanel>
<StackPanel Grid.RowSpan="2" VerticalAlignment="Bottom">
<StackPanel Style="{StaticResource DialpadPanelStyle}">
<local:Dialpad x:Name="Dialpad"/>
<Button IsEnabled="{Binding DialerPhoneNumber.DialPadEnabled, Mode=OneWay}"
Style="{StaticResource AccentLongButtonStyle}"
Command="{Binding ProcessDialDialerNumberHeap}" >
<Button.ContentTemplate>
<DataTemplate>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<FontIcon FontFamily="Segoe MDL2 Assets" Glyph="" RenderTransformOrigin="0.5,0.5">
<FontIcon.RenderTransform>
<CompositeTransform ScaleX=".75" ScaleY=".75"/>
</FontIcon.RenderTransform>
</FontIcon>
<TextBlock Text="Call"
Grid.Row="1"
Style="{StaticResource CaptionTextBlockStyle}"
Margin="0,4,0,0"
LineHeight="14"
HorizontalAlignment="Center" />
</Grid>
</DataTemplate>
</Button.ContentTemplate>
</Button>
</StackPanel>
</StackPanel>
</Grid>
</Grid>
</UserControl>
When I build the app with the changes above and run the sample, this is how it appears on the phone with my rectangle covering the Dial Pad:
I tried a couple of things including reduced fixed width and height for the Dialer Panel, but I could not make it work.
A couple of questions:
1. What am I doing wrong here and how can I fix it?
2. Is there a third party DialPad control (free or paid) that I can reference in my project and just use it?
Thanks for all your help!

I think the problem is in this line:
<StackPanel Grid.RowSpan="2" VerticalAlignment="Bottom">
This stack panel starts in row 0 where you the put
<StackPanel Grid.Row="0">
Can you try this?
<StackPanel Grid.Row="2" VerticalAlignment="Bottom">

How to make controls fill the container in WPF?

Below is my xaml code :
<Window x:Class="ScoresBank.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow">
<DockPanel LastChildFill="True">
<WrapPanel DockPanel.Dock="Top">
<ToolBar Height="25"></ToolBar>
</WrapPanel>
<WrapPanel DockPanel.Dock="Bottom">
<StatusBar Name="stbBottom" Height="25"
BorderThickness="2"
BorderBrush="Black">Example</StatusBar>
</WrapPanel>
<StackPanel DockPanel.Dock="Left">
<DockPanel LastChildFill="True">
<WrapPanel DockPanel.Dock="Top">
<Button Name="btnBrowseTags">TAGS</Button>
<Button Name="btnBrowseTitles">TITLES</Button>
</WrapPanel>
<ComboBox DockPanel.Dock="Top" Name="cbxCategory">
Example
</ComboBox>
<WrapPanel DockPanel.Dock="Bottom">
<TextBox Name="txtKeyword"></TextBox>
<Button Name="btnFind">Find</Button>
</WrapPanel>
<ListBox Name="lbxBrowse">
</ListBox>
</DockPanel>
</StackPanel>
<StackPanel DockPanel.Dock="Right">
<Button>Example</Button>
</StackPanel>
<Canvas>
</Canvas>
</DockPanel>
And this is my current layout view :
So, what I mean with filling the container are :
Making lbxBrowse to fill the mid-space of the DockPanel inside the left StackPanel.
Making txtKeyword to fill the WrapPanel.
Making stbBottom to fill the WrapPanel.
What I've tried :
It seems i've put them in a DockPanel with LastChildFill="True". But it seems doesn't work.
I don't know about this, since it's not possible to put it into a DockPanel first.
I don't know anything about this.
I don't use fixed size, since I need them to keep neat even when resized in multiple screen resolution. The fixed size on ToolBar and StatusBar seems required, otherwise, the text will be unseen.
P.S. If possible, I prefer the solution to be XAML code, rather than the C# code. Otherwise, C# code is fine too.
Thank you.

You should use a Grid. It is more easier to configure. Here is an example (I don't know exactly how you want to setup your layout).
<Window x:Class="SampleWpf.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="400" Width="600">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Button Margin="5" Content="TAGS"
Grid.Column="0" Grid.Row="0" />
<Button Margin="5" Content="TITLES"
Grid.Column="1" Grid.Row="0" />
<Button Margin="5" Content="EXAMPLES"
Grid.Column="2" Grid.Row="0"
HorizontalAlignment="Right"/>
<ComboBox Margin="5"
Grid.Column="0" Grid.ColumnSpan="2" Grid.Row="1" />
<ListBox Margin="5"
Grid.Column="2" Grid.Row="1" Grid.RowSpan="2" />
<Button Margin="5" Content="EXAMPLE"
Grid.Column="2" Grid.Row="3" HorizontalAlignment="Left" />
</Grid>
</Window>
And the result:
With a grid you can set the height and the width of the columns and rows to a specific value (in points, pixels, cm, etc.), to column content (Auto) or proportional to the grid (with *).

Instead of using a StackPanel and DockPanel you can use Grid and set Grid.ColumnDefinitions and Grid.RowDefinitions. You can specify directly each row Height and each column Width. It's easier to use and it automaticly fit to content and container.

Using TextWraping within a TextBox, inside a Grid for use within a ListBox in WP7

I am trying to get my data to display properly within a GridLayout, which is to be used as a DataTemplate for an Item within ListBox. Here is the code associated with what I am doing:
<Grid Name="FeedItemTemplate">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Image Source="{Binding ProfileImage}" Grid.RowSpan="2" Height="75" Width="75" VerticalAlignment="Center" Margin="1" />
<TextBlock Text="{Binding UserName}" Grid.Column="1" Foreground="#FFC8AB14" FontSize="28" HorizontalAlignment="Left"/>
<TextBlock Text="{Binding TimeStamp}" Grid.Column="2" TextWrapping="Wrap" FontSize="18" HorizontalAlignment="Center"/>
<TextBlock Text="{Binding Message}" Grid.Column="1" Grid.Row="1" Grid.ColumnSpan="2" TextWrapping="Wrap" FontSize="24" />
</Grid>
The issue is that using this layout, when TextWrapping is set to Wrap, the Item is displayed correctly, but when scrolling through the ListBox everything is really jittery, you cannot scroll in small increments, and it just jumps all over the place.
Any reason why it does this? As I said, only when TextWrapping is set to Wrap it does this. When its not used, it scrolls fine, but the text is all along one line and off the screen.

Does it keep jumping if you explicitly set the top-level Grid element's width to a fixed size?

For some reason that I do not fully understand, settings the ListBox's ItemsPanel property to a StackPanel might solve your problem:
<UserControl.Resources>
<ItemsPanelTemplate x:Key="MyItemsPanelTemplate">
<StackPanel/>
</ItemsPanelTemplate>
</UserControl.Resources>
...
<ListBox ... ItemsPanel="{StaticResource MyItemsPanelTemplate}"/>

This is a known issue with listbox scrolling in the current ctp when you have variable height items. The workaround for now is to set a fixed height on your listbox item content. You'll probably also notice the scroll bar doesnt properly go to the bottom all the time. The workaround fixes that too.
Reference.