Develop Reference

C# WPF - TransitioningContentControl with App.content

I Work with the theme of MahApps (Metro Dark) I looked the animations of this theme.
I came to a dead end: indeed I created a system to switch between different UserControl, that is to say that I have only one window and clicking on different buttons, I have this or such UserControl. But now I am with this system switch, I have no animation (only the start of the application).
How can I make an animation for each change in UserControl (Keeping Metro theme)?
Somebody ask me : use TransitioningContentControl
But i made my switcher like this :
class Switcher
{
public static UserControl WClient;
public static UserControl WHome;
public static UserControl WDataBase;
public Switcher()
{
WClient = new Windows.Client();
WHome = new Windows.Home();
WDataBase = new Windows.DataBase();
}
public static void currentWindow(UserControl window, string color)
{
Window curApp = Application.Current.MainWindow;
curApp.Content = window;
if (window == WClient)
{
curApp.Title = "CLIENT - INFO-TOOLS - BY NAOGRAFIX";
}
else if (window == WDataBase)
{
curApp.Title = "DATABASE - INFO-TOOLS - BY NAOGRAFIX";
}
else
{
curApp.Title = "HOME - INFO-TOOLS - BY NAOGRAFIX";
}
currentColor(color);
}
}
Now, when i clic on a button (to switch userControl) i use this :
private void BtnDataBase_Click(object sender, RoutedEventArgs e)
{
var color = "Red";
if (DataBase.isConnected) { color = "Green"; }
Switcher.currentWindow(Switcher.WDataBase, color);
}
I use CONTENT, i dont know if i can use TransitioningContentControl
Help :)
Nao*

You do need to use transitioning content control as you have said. You can add that as the direct content of the window then access it by name from the mainwindow and change its content instead.
Xaml
<metro:TransitioningContentControl x:Name="tContent"/>
C#
((ContentControl)curApp.FindName("tContent")).Content = window;
You will need the xml namespace definition
xmlns:metro="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
and you can change the transition using the Transition property on TransitioningContentControl

WPF XAML below shows use of MahApps.Metro TransitioningContentControl.
Click on the Content listbox to switch content.
Select the transition effect in the Transition listbox, then change selected Content to see the effect.
<Window x:Class="WpfMahApp.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:mah="http://metro.mahapps.com/winfx/xaml/controls"
mc:Ignorable="d"
Title="MainWindow" Height="600" Width="800">
<Window.Resources>
<TextBlock x:Key="Content1" Width="400" Height="200" Text="Content 1: TextBox" Background="Aqua" />
<Canvas x:Key="Content2" Width="200" Height="400" Background="DarkOrange">
<Ellipse Fill="YellowGreen" Stroke="Black" Width="100" Height="200" />
<Label Content="Content2: Canvas" />
</Canvas>
<Border x:Key="Content3" Width="100" Height="100" Background="Yellow" BorderBrush="Blue" BorderThickness="2" CornerRadius="4">
<TextBlock Text="Content3: Border" />
</Border>
</Window.Resources>
<StackPanel Orientation="Horizontal">
<StackPanel Orientation="Vertical" >
<CheckBox Margin="4" Content="Is Transitioning" IsChecked="{Binding ElementName=TransitioningContentControl,Path=IsTransitioning , Mode=OneWay}" />
<StackPanel Orientation="Vertical" Margin="8">
<TextBlock Text="Content" FontWeight="Bold"/>
<ListBox Name="ContentSelection" HorizontalAlignment="Left">
<ListBoxItem Content="Content 1" Tag="{StaticResource Content1}" />
<ListBoxItem Content="Content 2" Tag="{StaticResource Content2}" />
<ListBoxItem Content="Content 3" Tag="{StaticResource Content3}" />
</ListBox>
</StackPanel>
<StackPanel Orientation="Vertical" Margin="8">
<TextBlock Text="Transition" FontWeight="Bold" />
<ListBox Name="Transition" HorizontalAlignment="Left">
<ListBoxItem Content="Default" Tag="{x:Static mah:TransitionType.Default}"/>
<ListBoxItem Content="Normal" Tag="{x:Static mah:TransitionType.Normal}"/>
<ListBoxItem Content="Up" Tag="{x:Static mah:TransitionType.Up}"/>
<ListBoxItem Content="Down" Tag="{x:Static mah:TransitionType.Down}"/>
<ListBoxItem Content="Left" Tag="{x:Static mah:TransitionType.Left}" />
<ListBoxItem Content="Right" Tag="{x:Static mah:TransitionType.Right}"/>
<ListBoxItem Content="LeftReplace" Tag="{x:Static mah:TransitionType.LeftReplace}"/>
<ListBoxItem Content="RightReplace" Tag="{x:Static mah:TransitionType.RightReplace}"/>
</ListBox>
</StackPanel>
</StackPanel>
<mah:TransitioningContentControl Margin="8"
Name="TransitioningContentControl"
Background="Beige" BorderBrush="Black" BorderThickness="1"
Content="{Binding ElementName=ContentSelection, Path=SelectedValue.Tag}"
Transition="{Binding ElementName=Transition, Path=SelectedValue.Tag}" />
</StackPanel>
</Window>

how to get click event in itemTemplate

I have a gridView.
ıt has an Itemptemplate (textblock, image) and itemsource. textBlock and Image are binded to itemsource.
I want to add a button to ItempTemplate but I couldn't able to detect the eventHandler.
In my .cs file I dont see textblock, image or button.
how can I set the event,
here is the code of item template
<DataTemplate x:Key="IDViewStyle">
<Grid Width="350" Height="450" >
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition Height="40"/>
</Grid.RowDefinitions>
<Grid>
<Border Background="#B2060606" />
<Button HorizontalAlignment="Right" BorderThickness="0" x:Name="eraseButton" VerticalAlignment="Top">
<Image Source="/Assets/Images/erease.png" Width="90" Margin="0,-7,-15,15"/>
</Button>
<StackPanel Margin="0" Orientation="Vertical" HorizontalAlignment="Center" VerticalAlignment="Center">
<TextBlock HorizontalAlignment="Center" TextWrapping="Wrap" Text="+" VerticalAlignment="Center" Style="{StaticResource PageHeaderTextStyle}" FontSize="160" Margin="0"/>
<TextBlock TextWrapping="Wrap" Text="Ekle" TextAlignment="Center" Style="{StaticResource HeaderTextStyle}"/>
</StackPanel>
<Image Stretch="Fill" Source="{Binding Image}"/>
</Grid>
<TextBlock TextWrapping="Wrap" Text="{Binding Type}" VerticalAlignment="Top" Grid.Row="1" Style="{StaticResource SubheaderTextStyle}" TextAlignment="Center"/>
</Grid>
</DataTemplate>
and my .cs file
Data.IdentityTypeCollection collection;
gView.SelectionChanged += lvIdTypes_SelectionChanged;
collection = new Data.IdentityTypeCollection();
gView.ItemsSource = collection;
gView.ScrollIntoView(collection);
and my mainpage.xaml
<GridView x:Name="gView" Grid.Row="1" Grid.RowSpan="2" Margin="117,0,0,100" ItemTemplate="{StaticResource IDViewStyle}"/>
how can I use button event in the item template

On GridView you can assign a property ItemClick="YourClickEvent" like:
<GridView
x:Name="itemGridView"
IsItemClickEnabled="True"
ItemClick="ItemView_ItemClick"></GridView>
and in your .cs file the event handler:
void YourClickEvent(object sender, ItemClickEventArgs e)
{
//your codes here
}
Make sure GridView IsItemClickEnabled is set to True All set!

If I understand your question then this is what I did after using the debugger to look around. This is a UWP application. The Button is in a Grid in a DataTemplate in a "MedView" GridView. The following sets the ItemsSource:
List<ViewItemClass> lvil = new List<ViewItemClass>();
// create lvil
MedView.ItemsSource = lvil;
Then I added a Click event handler for the Button and the following is the code for that:
Button b = sender as Button;
if (b == null)
return;
Grid g = b.Parent as Grid;
if (g == null)
return;
ViewItemClass lvi = g.DataContext as ViewItemClass;
if (lvi == null)
return;
// use the item

NullPointerException after going back in a NavigationWindow

thats my navigation window
<NavigationWindow x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="800" Width="600" Source="Page1.xaml">
thats my page1
<Page x:Class="WpfApplication1.Page1"
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="600" d:DesignWidth="800"
Title="Page1" Name="IndexPage">
<ListView Name="myListView" ItemsSource="{Binding ElementName=IndexPage, Path=SeriesCollection}" ScrollViewer.HorizontalScrollBarVisibility="Disabled" IsSynchronizedWithCurrentItem="True" SelectionChanged="handleSelected">
<ListView.ItemsPanel >
<ItemsPanelTemplate>
<WrapPanel>
</WrapPanel>
</ItemsPanelTemplate>
</ListView.ItemsPanel>
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel >
<Image Width="214" Height="317" Source="{Binding Image}"/>
<Label Content="{Binding Name}" />
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
Page 2 is just en empty skeleton
code behind
namespace WpfApplication1
{
/// <summary>
/// Interaktionslogik für Page1.xaml
/// </summary>
public partial class Page1 : Page
{
private ObservableCollection<Series> _series =
new ObservableCollection<Series>();
public ObservableCollection<Series> SeriesCollection
{
get { return _series; }
}
public Page1()
{
InitializeComponent();
DirectoryInfo baseDir = new DirectoryInfo(#"C:\Serien");
DirectoryInfo[] dirs = baseDir.GetDirectories();
foreach (DirectoryInfo dir in dirs)
{
Series serie = new Series(dir);
Console.WriteLine("adding " + serie.Name);
_series.Add(serie);
}
Console.WriteLine(_series.Count);
}
public void handleSelected(object sender, RoutedEventArgs args)
{
Series currentSerie = (Series) myListView.Items.CurrentItem;
Page2 page = new Page2();
this.NavigationService.Navigate(page);
Console.WriteLine(currentSerie.Name);
Console.WriteLine(currentSerie.GetType());
Console.WriteLine(currentSerie.ToString());
}
}
}
so i click on an item to trigger the SelectionChanged Event to handle it in SelectionChanged where i navigate to page2 , so far so good.
then i use the back button from the navigation window and get stuck with an NullpointerException at
this.NavigationService.Navigate(page);
i dont even know why this method is triggered. So obviosly i am doing something stupid. Pls tell me what it is. Thanks for your time and affort.

The problem here is that you handle the wrong event. I assume that you want to open Page2 by clicking a ListViewItem. Therefore you should use mouse events instead of SelectionChanged.
For example, you can subscribe to StackPanel MouseDown event in your DataTemplate:
<DataTemplate>
<StackPanel Background="Transparent"
MouseDown="StackPanel_MouseDown">
<Image Width="214" Height="317" Source="{Binding Image}"/>
<Label Content="{Binding Name}"/>
</StackPanel>
</DataTemplate>
You can access clicked Series using the following:
private void StackPanel_MouseDown(object sender, MouseButtonEventArgs e)
{
var currentSerie = (Series)((StackPanel)sender).DataContext;
...
}
UPD If you need a real click, you may use a trick like this:
<DataTemplate>
<Button Click="Button_Click">
<Button.Template>
<ControlTemplate TargetType="Button">
<ContentPresenter/>
</ControlTemplate>
</Button.Template>
<StackPanel Background="Transparent">
<Image Width="214" Height="317" Source="{Binding Image}"/>
<Label Content="{Binding Name}"/>
</StackPanel>
</Button>
</DataTemplate>
We use a Button like a view-model which is able to handle clicks.

make data grid visible on click

I have this data grid where I am placing all my buttons
<Grid x:Name="ButtonGrid" HorizontalAlignment="Left" Margin="0,90,0,4" Width="186">
<Button x:Name="B1" Content="B1" Height="18" Margin="73,0,59,16" VerticalAlignment="Bottom" Click="B1"/>
<Button x:Name="B2" Content="B2" Height="18" Margin="0,0,-2,16" VerticalAlignment="Bottom" Click="B2_Click" HorizontalAlignment="Right" Width="57"/>
</Grid>
I have the grid collapased on start. But when a button {testGrid} is clicked, I want the grid to ne visible.
Here is my code
namespace project.Test
{
public partial class MainPage : UserControl
{
public MainPage()
{
InitializeComponent();
}
EDUTED
private void testGrid_Click(object sender, System.Windows.RoutedEventArgs e)
{
FrameworkElement ButtonGrid = (sender as FrameworkElement).FindName("ButtonGrid") as FrameworkElement;
if ( ButtonGrid.Visibility == System.Windows.Visibility.Collapsed)
ButtonGrid.Visibility = System.Windows.Visibility.Visible;
else
ButtonGrid.Visibility = System.Windows.Visibility.Collapsed;
}
}
}

I think if you move your Grid outside of your DataTemplate it will work. :)
However if you really need to put it in a DataTemplate, as long as your Button is at the same level as the Grid, you should still be able to find it.
Say your xaml code looks like this,
<UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="controlstoryboardactionrefissue.MainPage" Width="640" Height="480">
<UserControl.Resources>
<DataTemplate x:Key="DataTemplate1">
<Grid x:Name="myGrid" Height="128" Background="#FFE7C0C0" Width="333">
<Button x:Name="myButton" Content="Button" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="31,29,0,0" Click="myButton_Click" />
</Grid>
</DataTemplate>
</UserControl.Resources>
<Grid x:Name="LayoutRoot" Background="White">
<ContentControl HorizontalAlignment="Left" VerticalAlignment="Top" Margin="175,198,0,0" ContentTemplate="{StaticResource DataTemplate1}" />
</Grid>
</UserControl>
Then the code behind,
private void myButton_Click(object sender, System.Windows.RoutedEventArgs e)
{
var myButton = (Button)sender;
var grid = myButton.Parent as Grid;
if (grid != null)
{
// do stuff
}
}
Hope it helps. :)

How to remove a custom item from a listBox and ObservableCollection when click on a button

I have the listBox and a ObservableCollection. The listBox.ItemSource (listNotify.ItemSource) is set to that ObservableCollection (errosList).
The problem that i have is that i don`t know how to remove the correct element from errorsList when the user click on the button with content x from listBox. For the item of the listBox i use a ItemTemplate, inside a stackPanel and in stackPanel i have a button.
Bellow is the XAML code:
<ListBox x:Name="listNotify">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" Height="35">
<Image Height="16" Source="/Template;component/Resources/error.png" Stretch="Fill" VerticalAlignment="Top" Width="16"/>
<StackPanel Orientation="Vertical">
<HyperlinkButton Content="{Binding ErrorHeader}" HorizontalAlignment="Left" Height="16" Width="125"/>
<TextBlock Text="{Binding ErrorMessage}" HorizontalAlignment="Left" Width="405" d:LayoutOverrides="VerticalAlignment" />
</StackPanel>
<Button Content="x" Width="20" Height="20" Click="removeError_Click"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
The code is from a silverlight 4 project.
Thanks.

private void removeError_Click(object sender, RoutedEventArgs e) {
FrameworkElement fe = sender as FrameworkElement;
if (null != fe) {
_observableCollection.Remove((YourType)fe.DataContext);
}
}
Should do what your looking for. Replace YourType with the type you declared in the ObservableCollectiion.

Don't you have an ID-like property in your Items of the errorsList-Collection? Then you could use the Tag-Property of the Button to archieve this:
<Button Content="x" Width="20" Height="20" Tag="{Binding ID}" Click="Button_Click" />
and in the click-event of the button:
string id = ((Button) sender).Tag.ToString();
var itemToRemove = errorsList.Where(x => x.ID == id).First();
errorsList.Remove(itemToRemove);
Hope that helps