Is there a possibility to use the Surface-keyboard to alter text in a normal textbox?
I'm creating a textbox and add the text in code behind. And now I want that the user can change the text if he touches the text.
<Grid x:Name="TextContainer" Margin="0,0,0,0" Background="Transparent" Height="66" Width="66">
<TextBlock x:Name="contentTextBlock" Margin="0" Text="NodeDesign_X" VerticalAlignment="Center" d:LayoutOverrides="Width" HorizontalAlignment="Center" Foreground="White" TextTrimming="CharacterEllipsis" TextWrapping="WrapWithOverflow" />
</Grid>
I didn't find possibilities to alter the SurfaceTextBox in the way my TextBlock locks now.
Thanks in advance!
Use a TextBox instead of TextBlock then the user can change the text. If you are in Surface Mode the Keyboard will be automatic popup if the TextBox gets the focus.
Related
For a xamarin forms project on my iPhone/iOS (12.4), I'm using ItemTemplate to showing ViewCells of a ListView.
This looks like this:
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Grid>
...
<Frame
BackgroundColor="{Binding Value, Mode=OneWay, Converter={StaticResource PositionToBackgroundColorConverter}}"
BorderColor="{Binding Value, Mode=OneWay, Converter={StaticResource PositionToTextColorConverter}, ConverterParameter={x:Static model:ItemComponent.Border}}">
...
This works pretty fine, sofar a selected item is not set. When I select an item, the selected row are drawing by the framework, and its background is set to gray. In this state the background of the frame is not drawn correctly. Or the background of the selection "overpainting" the background of the frame.
Do you know a (simple?) method to redraw the Frame, after the selected item is changed?
EDIT:
For example, to easier understanding the problem, I put here an image with two ViewCells. The first ListItem is not selected, the second ListItem is selected. This is a symbolic illustration of unwanted behavior!
When the ListItem is selected it should looks like this here:
I have a ListView with the default SeparatorVisibility. My Android project shows the Separator if there are elements in the ItemsSource and stops showing it below the last element. It's the result I want for my iOS project.
However, in my iOS project the screen is full of Separators no matter how many elements I have, even if I have no elements or only one, the Separators still being there.
Could someone give me a reason and how to fix it please? Thanks.
I think you can take a look to this post
these are some tips
First disable the default separator, this is done by adding following property to the ListView XAML
SeparatorColor="Transparent"
After this, wrap the complete ViewCell content inside a double StackLayout! I know this sounds like overkill but this way you’ll not run into any BoxView issues regarding margins inside the ViewCell… or other stuff.
The first StackLayout should have a BackgroundColor set to the colour you want your separator to be, the second StackLayout should have the same BackgroundColor as the rest of the container it is in… in our example the page and that is set to white. Be sure to also add a Margin to the bottom of this second StackLayout because that will represent the thickness of our separator!
I think you can play with this "Margin"... when your data is empty, remove the margin so you should not have the separator
<ListView x:Name="SeparatorListView"
SeparatorColor="Transparent"
ItemsSource="{Binding Persons}"
Margin="0,20,0,0"
RowHeight="60"
HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"
BackgroundColor="White"
Grid.Row="1">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell IsEnabled="false">
<StackLayout VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand"
BackgroundColor="Black">
<StackLayout VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand"
BackgroundColor="White"
Margin="0,0,0,0.4">
<StackLayout VerticalOptions="CenterAndExpand" HorizontalOptions="FillAndExpand" Spacing="0">
<Label Text="{Binding FullName}" TextColor="Maroon" VerticalOptions="CenterAndExpand" Margin="20,0,20,0" />
<Label Text="{Binding Profession}" TextColor="Maroon" VerticalOptions="CenterAndExpand" Margin="20,0,20,0" />
</StackLayout>
</StackLayout>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
With that in place, you’ll get the same visual result as the preview image at the top right of this blog post.
As a bonus, you could omit one of the StackLayouts IF your page has a background color other than white. Because if this is the case, you can use that color as the separator color by playing with transparency inside the ListView.
Example of this, note will only work if the page itself also has a BackgroundColor set to Olive!
<ListView x:Name="SeparatorListView"
SeparatorColor="Transparent"
ItemsSource="{Binding Persons}"
Margin="0,20,0,0"
RowHeight="60"
HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"
BackgroundColor="Olive"
Grid.Row="1">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell IsEnabled="false">
<StackLayout BackgroundColor="#f4eac3"
Padding="0,5,0,5"
HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
<StackLayout BackgroundColor="Transparent"
HorizontalOptions="FillAndExpand" VerticalOptions="CenterAndExpand"
Spacing="0"
Margin="20,0,20,0">
<Label Text="{Binding FullName}" TextColor="Maroon" VerticalOptions="CenterAndExpand" />
<Label Text="{Binding Profession}" TextColor="Maroon" VerticalOptions="CenterAndExpand" />
</StackLayout>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
using UIKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;
[assembly: ExportRenderer (typeof(ListView), typeof(CustomListViewRenderer))]
namespace yourNamespace
{
public class CustomListViewRenderer : ListViewRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.ListView> e)
{
base.OnElementChanged(e);
if (e.NewElement != null)
{
var listView = Control as UITableView;
listView.SeparatorInset = UIEdgeInsets.Zero;
}
}
}
}
That is due to the implementation of the ListView on the iOS side. It renders as a UITableView which (in the case of the ListView) always takes the entire height and shows empty items. To change this type of behavior you could set the ListView height dynamically in the code-behind for your page. Another option is taking a look at Xamarin's Evolve sample app which has a few pages where it uses a CardView combined with a ListView to make it appear as it does on Android.
I'm trying to create a scrollable area to display controls using the XAML code below. My problem is that I only see one item displayed when the items are rendered. I'm using an ObservableCollection for the data.
I've attached to the CollectionChanged event on the collection and definitely see multiple items being added but the view always displays only one item.
If I manually place HubTiles inside the WrapPanel (not databound) the tiles show up correctly. Also I tried replacing the hub tile with a button control and I do see multiple buttons, so I'm wondering if perhaps there is some issue with the HubTile control.
Here's my XAML:
<Grid x:Name="dataGrid" Grid.Row="1">
<ScrollViewer x:Name="myPanel" HorizontalAlignment="Stretch" Width="Auto" Margin="0" >
<toolkit:WrapPanel MaxWidth="{Binding ActualWidth, ElementName=myPanel, Mode=OneWay}" Margin="0" HorizontalAlignment="Center" ItemHeight="230" ItemWidth="230">
<ItemsControl x:Name="images">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<toolkit:WrapPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<toolkit:HubTile
Style="{Binding Source={StaticResource media}}"
Message="{Binding Data.Caption}"
Source="{Binding Data.Source}"
/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</toolkit:WrapPanel>
</ScrollViewer>
</Grid>
Difficult to say without more information,
but the first thing I noticed is that you have a WrapPanel in a ScrollViewer,
and that WrapPanel contains an ItemsControl, with a WrapPanel as ItemsPanel.
The "inner" WrapPanel doesn't have an ItemWidth or ItemHeight. Is there any reason you have two WrapPanel's?
Why isnt this selected value binding working? I am utterly confused here. When I load the page, the first text box properly shows the contents of 'SelectedComponentAnalysisViewModel.ReacEffectViewModel.Note.NoteID', in this case '20'.
What SHOULD happen is when the page is first loaded, the combobox should have the note with ID 20 preselected.
However, the combobox and the second text box are both empty (but the list of notes is populated). As soon as I selected an entry, the 2nd combobox is updated with the newly selected Note ID.
This only happens when the page is first loaded. As soon as I select a different SelectedComponentAnalysisViewModel it all works fine and the appropriate value is automatically selected in the combobox.
My only guess here is that somehow the combobox is trying to bind to the selected value before it is populated. Is there some way to force it to wait till its populated to bind? Or at least make it try to bind after it has been populated? Or maybe the reverese is happening and its trying to load before its datasource is loaded? But if that were the case, then I would expect the first text box to be empty.
(the text boxes are just there to help me debug this)
<ComboBox x:Name="ReactionEffectNoteSelector" ItemTemplate="{DynamicResource DataTemplate1}" ItemsSource="{Binding NoteViewModelList}" SelectedValuePath="NoteID" SelectedValue="{Binding SelectedComponentAnalysisViewModel.ReacEffectViewModel.Note.NoteID, Mode=OneWay}">
<ComboBox.Resources>
<DataTemplate x:Key="DataTemplate1">
<TextBlock TextWrapping="Wrap" Text="{Binding NoteID, Mode=OneWay}"/>
</DataTemplate>
</ComboBox.Resources>
</ComboBox>
<TextBlock HorizontalAlignment="Right" Text="{Binding SelectedComponentAnalysisViewModel.ReacEffectViewModel.Note.NoteID}"/>
<TextBlock HorizontalAlignment="Right" Text="{Binding SelectedValue, ElementName=ReactionEffectNoteSelector, Mode=OneWay}"/>
Why are you binding the SelectedValue to SelectedComponentAnalysisViewModel.ReacEffectViewModel.Note.NoteID and then setting SelectedValuePath to NoteID? That implies that there is a SelectedComponentAnalysisViewModel.ReacEffectViewModel.Note.NoteID.NoteID property.
I think you want to set SelectedValue set to SelectedComponentAnalysisViewModel.ReacEffectViewModel.Note.
I have a popup within a user control. The popup uses a TextBox to show a textual preview of data produced by the control.
How do I make the popup size itself to the user control it's inside of? With code as shown below, I find that the text box is sized according to its content, and the popup is sized according to the textbox.
It works fine if I use fixed sizes in my row and column definitions, but I would like to popup to resize itself to match the user control (which in turn matches the browser).
<UserControl
<!-- usual stuff here -->
>
<Grid>
<!-- layout for the user control here -->
<!-- and after that my popup: -->
<Popup Name="MyPopup">
<Border BorderBrush="Black" BorderThickness="2" >
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="22"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"></ColumnDefinition>
</Grid.ColumnDefinitions>
<TextBlock Grid.Row="0" Text="Preview:" Margin="5" ></TextBlock>
<TextBox
Grid.Row="1"
Name="MyTextBox"
IsReadOnly="True"
HorizontalScrollBarVisibility="Visible"
VerticalScrollBarVisibility="Visible"
TextWrapping="Wrap"
Margin="5"
>
</TextBox>
</Grid>
</Border>
</Popup>
</Grid></UserControl>
The C# code to do this would be something like:
textBox1.Width = UserControl.Width;
textBox1.Height = UserControl.Height;
textBox1.Margin = UserControl.Margin;
The key here is resetting the margin. I know this works in WPF to, say, fill a Window with a TextBox. Give it a try, see if it works.