I have a custom control CustomStackPanel which is a subclass of the StackPanel containing a CheckBox. The XAML is
<StackPanel x:Class="MyApp.CustomStackPanel"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400" Orientation="Horizontal">
<CheckBox IsChecked="True">check me</CheckBox>
</StackPanel>
and the code behind doesn't do much:
namespace MyApp
{
public partial class CustomStackPanel: StackPanel
{
public CustomStackPanel()
{
InitializeComponent(); // added by Visual Studio
}
}
}
I can add the CustomStackPanel to the MainPage via XAML like
<local:CustomStackPanel />
and a CheckBox appears when I run the program. If instead I try to create a panel dynamically and add it to a container the CheckBox does not appear on the screen.
Old code:
...
StackPanel sp = new StackPanel();
sp.Add(new CheckBox());
somewhere.Add(sp);
...
--> I see a checkbox
New code:
...
somewhere.Add(new CustomStackPanel());
...
--> No checkbox
Related
I have a UserControl that basically wraps a RichTextBox It looks something like this:
<UserControl x:Class="Installers.Ui.Views.Controls.RichTextBox"
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"
mc:Ignorable="d"
d:DesignHeight="450" d:DesignWidth="800">
<UserControl.Resources>
<ResourceDictionary Source="../../Theme/ElementsTheme.xaml"></ResourceDictionary>
</UserControl.Resources>
<RichTextBox x:Name="MyRichTextbox" Background="{StaticResource BackgroundColorBrush}" Foreground="{StaticResource GrayColorBrush}" BorderThickness="0" BorderBrush="Transparent">
</RichTextBox>
</UserControl>
I have some styling in the code behind, something that looks like:
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
var text = GetValue(RTFTextProperty).ToString();
var memoryStream = new MemoryStream(ASCIIEncoding.Default.GetBytes(text));
MyRichTextbox.Selection.Load(memoryStream, DataFormats.Rtf);
MyRichTextbox.IsReadOnly = IsReadOnly;
}
This is the outcome:
Now on to my question: As you can see there are "Boxes" around some of the text, How can I change the color of them to the background color or how can I remove them entirely?
I'm trying to apply a vertical scrollbar to the Dragablz TabControl. Minimum example:
MainWindow.cs
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
TabablzControl tb = new TabablzControl();
TabItem tabItem;
for (int i = 0; i < 15; i++)
{
tabItem = new TabItem
{
Header = $"Tab_{i}"
};
tb.Items.Add(tabItem);
}
tb.TabStripPlacement = Dock.Left;
MystackPanel.Children.Add(tb);
}
}
MainWindow.xaml:
<Window x:Class="WpfApp3.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
xmlns:local="clr-namespace:WpfApp3"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<ScrollViewer>
<StackPanel x:Name="MystackPanel">
</StackPanel>
</ScrollViewer>
</Window>
Currently the vertical scrollbar appears only when the stackpanel that holds the TabablzControl is wrapped with the scrollviewer. However, it's still not possible to scroll within the tabs.
I tried also this solution https://stackoverflow.com/a/36919193/9200834 to build a custom control template. This fails, because this Dragablz style is not applicable to the TabItem object.
Does anyone have an idea, how to put a vertical scrollbar to the Dragablz tabs?
When trying to rebuild a WPF Application to use Caliburn Micro I experienced that a TextBox does not loose focus when you click outside of it. Is there a fix for that behaviour?
I am using Caliburn Micro 3.2.0. I tried using older versions but this problem persits.
XAML:
<Window x:Class="WPFUI.Views.ShellView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WPFUI.Views"
xmlns:cal="http://www.caliburnproject.org"
mc:Ignorable="d"
Title="ShellView" Height="450" Width="800">
<Grid>
...
<WrapPanel>
<TextBox x:Name="Name" MinWidth="50"
cal:Message.Attach="[Event LostFocus] = [Action Name_LostFocus()];
[Event PreviewTextInput] = [Action Name_PreviewTextInput($source, $eventArgs)]">
</TextBox>
...
</WrapPanel>
...
</Grid>
</Window>
I assume this is a case where you do not have any other Element in the Window other than the Textbox, which is why it cannot lose focus. One way to achieve this is to make the Window Focusable and setting Focus to it using a behavior.
For Example, assuming your Xaml to be as follows
<Window x:Class="CM.WPFApp2019.Views.ShellView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:cal="http://www.caliburnproject.org"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:CM.WPFApp2019.Views"
xmlns:i = "http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:behaviors="clr-namespace:CM.WPFApp2019.ViewModels"
mc:Ignorable="d" Focusable="True"
Title="ShellView" Height="450" Width="800">
<i:Interaction.Behaviors>
<behaviors:ClearFocusOnClickBehavior ElementToClearFocus="{Binding ElementName=Name}"/>
</i:Interaction.Behaviors>
<Grid>
<WrapPanel>
<TextBox x:Name="Name" MinWidth="50" Focusable="True"
cal:Message.Attach="[Event LostFocus] = [Action Name_LostFocus()];
[Event PreviewTextInput] = [Action Name_PreviewTextInput($source, $eventArgs)]">
</TextBox>
</WrapPanel>
</Grid>
</Window>
Please note I have added a Behavior called ClearFocusOnClickBehavior to the Window. Also you have set the Focusable Property of Window to be true.
Now you can define the behavior as follows
public class ClearFocusOnClickBehavior : Behavior<FrameworkElement>
{
public static readonly DependencyProperty ElementToClearFocusProperty = DependencyProperty.RegisterAttached("ElementToClearFocus", typeof(FrameworkElement),
typeof(ClearFocusOnClickBehavior), new UIPropertyMetadata());
public FrameworkElement ElementToClearFocus
{
get { return (FrameworkElement)GetValue(ElementToClearFocusProperty); }
set { SetValue(ElementToClearFocusProperty, value); }
}
protected override void OnAttached()
{
AssociatedObject.MouseDown += (sender, args) =>
{
FrameworkElement ctrl = ElementToClearFocus;
FrameworkElement parent = (FrameworkElement)ElementToClearFocus.Parent;
while (parent != null && parent is IInputElement
&& !((IInputElement)parent).Focusable)
{
parent = (FrameworkElement)parent.Parent;
}
DependencyObject scope = FocusManager.GetFocusScope(ElementToClearFocus);
FocusManager.SetFocusedElement(scope, parent as IInputElement);
};
base.OnAttached();
}
}
The Behavior would add a MouseDown event for the associated object, where you could trace the Parent of the ElementToClearFocus Control which can be Focused. In this case, since you have set the Window as focusable, it would receive the Focus. The Textbox in turn loses the focus and raises the Name_LostFocus method
I try to change the color of a canvas by pressing a button using command binding insted of click event to avoid any code behind in the MyView.xaml.cs file. The command is fireing and the messageboxes show the correct color code values before and after changing it so the new color is set but the color of the canvas do not change. If a use a click event and the code behind in the MyView.xaml.cs insted than all work fine but I would like to get it work wiht command bindning and without code behind in the MyView.xaml.cs file. How can I do that and what is that I am not doing right?
MainWindow.xaml
<Window x:Class="WpfApp1.MainWindow"
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:View="clr-namespace:WpfApp1.View"
xmlns:ViewModel="clr-namespace:WpfApp1.ViewModel"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525" Background="YellowGreen"
WindowStartupLocation="CenterScreen">
<Window.DataContext>
<ViewModel:MyClass/>
</Window.DataContext>
<View:MyView/>
</Window>
MyView.xaml file
<UserControl x:Class="WpfApp1.View.MyView"
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:ViewModel="clr-namespace:WpfApp1.ViewModel"
xmlns:View="clr-namespace:WpfApp1.View">
<Canvas Name="MainCanvas" Height="300" Width="502" Background="#FF148B63">
<Button Name="ChangeColorButton" Command="{Binding CommandChangeColor}" Content="new color" Height="25" Width="55" Margin="225,268,225,10"/>
</Canvas>
</UserControl>
MyClass.cs
public class MyClass : MyView
{
List<Color> _listOfColors = new List<Color>();
public MyClass(){ MyInitColor(); }
public ICommand CommandChangeColor
{
get { return new MyCommand(ChangeColor); }
}
public void ChangeColor()
{
MessageBox.Show("Color before: " + MainCanvas.Background.ToString());
Random rnd = new Random();
int i = rnd.Next(_listOfColors.Count - 1);
MainCanvas.Background = new SolidColorBrush(_listOfColors[i]);
MessageBox.Show("Color after: " + MainCanvas.Background.ToString());
}
}
Since you can have many instances of a UserControl, how would MyClass know which instance of MainCanvas it should be updating?
So similar to your binding for CommandChangeColor you should also bind the Background to some property in MyClass. Something like:
Xaml:
<Canvas Name="MainCanvas" Height="300" Width="502" Background="{Binding BackGroundColor}">
<Button Name="ChangeColorButton" Command="{Binding CommandChangeColor}" Content="new color" Height="25" Width="55" Margin="225,268,225,10"/>
</Canvas>
MyClass.cs
public SolidColorBrush BackGroundColor {get;set;}
public void ChangeColor()
{
MessageBox.Show("Color before: " + MainCanvas.Background.ToString());
Random rnd = new Random();
int i = rnd.Next(_listOfColors.Count - 1);
BackGroundColor = new SolidColorBrush(_listOfColors[i]);
MessageBox.Show("Color after: " + MainCanvas.Background.ToString());
}
You will probably also want to implement INotifyPropertyChanged.
I am trying to load a RenderWindowControl from vtk libraries on my WPF proyect using ActiViz.NET and Visual Studio 2013. The library works fine since I did a new project just to practice on itbut when I tried to integrate it into my work, I got a null RenderWindowControl this time. This is my code:
MainWindow.xaml:
<Window x:Class="myProject.Views.MainWindow"
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:VtkTab="clr-namespace:myProject.Views.UITabs.VtkTab"
x:Name="Mainwindow"
MinHeight="600"
MinWidth="800"
Title="{Binding Title}"
Height="720"
Width="1280"
Icon="{StaticResource ApplicationIcon}"
Loaded="OnLoaded"
DataContext="{Binding Main, Source={StaticResource ViewModelLocator}}"
Style="{StaticResource WindowStyle}"
mc:Ignorable="d">
<DockPanel>
<TabControl>
....
....
<VtkTab:VtkTabView />
....
....
</TabControl>
</DockPanel>
</Window>
VtkTabView.xaml:
<UserControl x:Class="myProject.Views.UITabs.VtkTab.VtkTabView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:vtk="clr-namespace:Kitware.VTK;assembly=Kitware.VTK"
Loaded="WindowLoaded"
Height="480" Width="640">
<WindowsFormsHost Name="Wfh">
<vtk:RenderWindowControl x:Name="RenderControl" />
</WindowsFormsHost>
</UserControl>
VtkTabView.xaml.cs:
public partial class UITabView
{
protected static Random _random = new Random();
vtkActor actor = vtkActor.New();
public VtkTabView()
{
InitializeComponent();
var sphere = vtkSphereSource.New();
sphere.SetThetaResolution(8);
sphere.SetPhiResolution(16);
var shrink = vtkShrinkPolyData.New();
shrink.SetInputConnection(sphere.GetOutputPort());
shrink.SetShrinkFactor(0.9);
var move = vtkTransform.New();
move.Translate(_random.NextDouble(), _random.NextDouble(), _random.NextDouble());
var moveFilter = vtkTransformPolyDataFilter.New();
moveFilter.SetTransform(move);
moveFilter.SetInputConnection(shrink.GetOutputPort());
var mapper = vtkPolyDataMapper.New();
mapper.SetInputConnection(moveFilter.GetOutputPort());
// The actor links the data pipeline to the rendering subsystem
actor.SetMapper(mapper);
actor.GetProperty().SetColor(1, 0, 0);
}
private void WindowLoaded(object sender, RoutedEventArgs e)
{
var renderer = RenderControl.RenderWindow.GetRenderers().GetFirstRenderer();
renderer.AddActor(actor);
}
}
RenderControl.RenderWindow is null on WindowLoaded (VtkTabView.xaml.cs) and I do not know why. Might it be because I load UITabView from a second xamp and I lose the content of RenderControl?, it is the only difference I see compare to the example I did.
Access the RenderWindow on Load event of the RenderWindowControl.
e.g.
public VtkTabView()
{
InitializeComponent();
// initialize your sphrere and actor
RenderControl.Load += MyRenderWindowControlOnLoad;
}
private void MyRenderWindowControlOnLoad(object sender_in, EventArgs eventArgs_in){
//access the RenderWindow here
}