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
}
Related
I created a new WPF app in Visual Studio and I placed a button using the drag and drop editor but I can't access the button in my .cs file using
MainButton.Content = "Set output to red";
but I get an error
System.NullReferenceException: 'Object reference not set to an instance of an object.'
MainButton was null while running the application.
The drag and drop editor generated this xaml file
<Window x:Class="WpfApp1.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:local="clr-namespace:WpfApp1"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid>
<Border HorizontalAlignment="Center" VerticalAlignment="Center" BorderBrush="Black" BorderThickness="3">
<TextBlock x:Name="Output" Background="Transparent" TextAlignment="Center" TextWrapping="Wrap" Text="Output" Height="88" Width="264"/>
</Border>
<RadioButton x:Name="Option1" Content="Red Pill" HorizontalAlignment="Left" Margin="135,75,0,0" VerticalAlignment="Top" Checked="RadioButton_Checked" IsChecked="True"/>
<RadioButton x:Name="Option2" Content="Blue Pill" HorizontalAlignment="Left" Margin="536,72,0,0" VerticalAlignment="Top" Checked="RadioButton_Checked_1"/>
<Button x:Name="MainButton" Content="Set output to red" HorizontalAlignment="Left" Margin="279,100,0,0" VerticalAlignment="Top" Width="213" Height="41" Click="MainButton_Click"/>
</Grid>
</Window>
Here's the .cs file
using System.Windows;
using System.Windows.Media;
namespace WpfApp1
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void MainButton_Click(object sender, RoutedEventArgs e)
{
if ((bool)Option1.IsChecked)
{
Output.Background = Brushes.Crimson;
}
else
{
Option2.IsChecked = true;
Output.Background = Brushes.DodgerBlue;
}
}
private void RadioButton_Checked(object sender, RoutedEventArgs e)
{
MainButton.Content = "Set output to red";
}
private void RadioButton_Checked_1(object sender, RoutedEventArgs e)
{
MainButton.Content = "Set output to blue";
}
}
}
I can access other things in the UI just fine like radio buttons and text blocks but not the button. Why could this be happening?
During the initialization phase, some variables are going to be null since it hasn't been reached in the call order. RadioButton_Checked is called through event before the button is constructed since it contains the Checked property.
A quick and easy fix is as follows: Check for null in your event calls.
private void RadioButton_Checked (object sender, RoutedEventArgs e)
{
if(MainButton != null)
MainButton.Content = "Set output to red";
}
private void RadioButton_Checked_1 (object sender, RoutedEventArgs e)
{
if (MainButton != null)
MainButton.Content = "Set output to blue";
}
Of course, there are better ways to handle this. You could set checked on a separate event, Initialized, which will handle it much cleaner.
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.
How do I get a ListViewItem text by this item index? I tried this
txt = historico.Items[i].ToString();
but I got this
"Windows.UI.Xaml.Controls.ListViewItem"
In the MainPage.xaml:
<Page
x:Class="PushNotification_Sampl.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:PushNotification_Sampl"
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>
<ListView Name="list">
<ListViewItem>1</ListViewItem>
<ListViewItem>2</ListViewItem>
<ListViewItem>3</ListViewItem>
<ListViewItem>4</ListViewItem>
<Button x:Name="getBtn" Click="getBtn_Click">Get</Button>
<TextBlock x:Name="text" Width="137" Text="check"></TextBlock>
</ListView>
</Grid>
And in MainPage.xaml.cs, I have added the click event for the button:
private void getBtn_Click(object sender, RoutedEventArgs e)
{
string result = (list.Items[2] as ListViewItem).Content.ToString();
text.Text = result;
}
This works well in Windows Phone 8.1 app. Successfully tested. Hope this helps.
txt = (historico.Items[i] as ListViewItem).Content.ToString();
or
txt = (historico.Items[i] as ListViewItem).Text;
txt = historico.Items[i].Text;
how can move (change position) label from position to another using wpf **
animation
** in specify event such click using c# code not trigger ??
using System.windows.media.animation;
XAML
<Window x:Class="WpfApplication2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Canvas>
<Button Content="Button" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Click="Button_Click" Canvas.Left="201" Canvas.Top="116" x:Name="Button"/>
</Canvas>
</Window>
Code
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void Button_Click(object sender, RoutedEventArgs e)
{
var storyboard = new Storyboard();
var pointAnimation = new DoubleAnimation()
{
From = Canvas.GetLeft(Button),
To = Canvas.GetLeft(Button) + 200,
Duration = new Duration(TimeSpan.FromSeconds(10))
};
Storyboard.SetTarget(pointAnimation, Button);
Storyboard.SetTargetProperty(pointAnimation, new PropertyPath(Canvas.LeftProperty));
storyboard.Children.Add(pointAnimation);
storyboard.Begin();
}
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