how to bind observable collection Count value in textblock Windows Phone - c#

How i can bind observable collection Count value in textblock in windows phone in listbox
<Grid Margin="440,26,10,0" Grid.Row="1" HorizontalAlignment="Right">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<StackPanel Grid.Column="0" Orientation="Horizontal" HorizontalAlignment="Right" Margin="0,0,0,0">
<Grid Height="25" MinWidth="25">
<Grid.Background>
<ImageBrush ImageSource="{Binding Image}" Stretch="Fill"/>
</Grid.Background>
<TextBlock Name="Message_Count" Text="{Binding CollectionCount}" Foreground="White" FontSize="20" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Grid>
</StackPanel>
</Grid>
List<CountMsg> retrieved = dbConnCount.Table<CountMsg>().ToList<CountMsg>();
dbCount = new ObservableCollection<CountMsg>(retrieved);
i want to bind dbCount.Count in textblock;

Here is an example:
MainWindow.cs:
ObservableCollection<CountMsg> dbCount;
public int CollectionCount
{
get
{
return dbCount.Count;
}
}
public MainWindow()
{
InitializeComponent();
DataContext = this;
List<CountMsg> retrieved = dbConnCount.Table<CountMsg>().ToList<CountMsg>();
dbCount = new ObservableCollection<CountMsg>(retrieved);
}
Xaml:
<Window x:Class="MainWindow">
....
<TextBlock Text="{Binding CollectionCount}" ... />
....
</Window>

Related

How to add multiple elements to the wrappanel?

I am trying to insert several StackPanel inside the WrapPanel as you can see the XAML below:
Only the TextBlock inside the StackPanel will be modified so as not to repeat the Title and Text.
<Window x:Class="ambient_test.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:ambient_test"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid>
<ScrollViewer CanContentScroll="True">
<WrapPanel x:Name="wrappanel">
<StackPanel x:Name="panel1" Width="120" Margin="5">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="120"/>
<RowDefinition Height="50"/>
</Grid.RowDefinitions>
<StackPanel Grid.Row="0" Background="#FF38C59F"></StackPanel>
<TextBlock Grid.Row="2" Text="Title 1" Foreground="LightGray" VerticalAlignment="Top" TextAlignment="Center"/>
<TextBlock Grid.Row="1" Text="Text 1" Foreground="#FF747474" TextAlignment="Center" Margin="0 15 0 0"/>
</Grid>
</StackPanel>
<StackPanel x:Name="panel2" Width="120" Margin="5">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="120"/>
<RowDefinition Height="50"/>
</Grid.RowDefinitions>
<StackPanel Grid.Row="0" Background="#FF38C59F"></StackPanel>
<TextBlock Grid.Row="2" Text="Title 2" Foreground="LightGray" VerticalAlignment="Top" TextAlignment="Center"/>
<TextBlock Grid.Row="1" Text="Text 2" Foreground="#FF747474" TextAlignment="Center" Margin="0 15 0 0"/>
</Grid>
</StackPanel>
</WrapPanel>
</ScrollViewer>
</Grid>
</Window>
I created a class called Info to change the Title and the Text. In the method constructor I have a for loop that will add 10 contents to the List.
public MainWindow()
{
InitializeComponent();
List<Info> infos = new List<Info>();
for (int i = 0; i < 10; i++)
{
infos.Add(new Info()
{
Title = $"title {i}",
Text = $"text {i}"
});
}
}
public class Info
{
public string Title { get; set; }
public string Text { get; set; }
}
For example, my List has 100 records, so I need to add 100 StackPanel inside my WrapPanel following the same Title and Text as the List.
Is there any way to do this? For example using Binding?
You would use an ItemsControl that uses a WrapPanel as its ItemsPanel, and defines the layout of the items by an appropriate DataTemplate:
<ItemsControl x:Name="itemsControl">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="120"/>
<RowDefinition Height="50"/>
</Grid.RowDefinitions>
<TextBlock Grid.Row="0" Text="{Binding Title}" .../>
<TextBlock Grid.Row="1" Text="{Binding Text}" .../>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
and assign the List<Info> to its ItemsSource property:
itemsControl.ItemsSource = infos;

WPF ListView - detect ListVewItem when selected item is not clicked

I'm trying to get an item in ListView in WPF when user doesn't select an item by clicking on it but the user taps on it.
Is there a way to achieve this in WPF ListView.
ListView dataSource is filled by a dynamic collection in code-behind.
I'm getting a null object when user taps on it.
Item selectedItem = (Item)lv_CartItems.SelectedItem;
this is how my data-template looks like for listview.
<ListView.ItemTemplate>
<DataTemplate>
<Viewbox>
<Grid Width="230" Height="110" >
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition Width=".1*" />
<ColumnDefinition />
<ColumnDefinition/>
<ColumnDefinition/>
<ColumnDefinition Width=".5*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="2*" />
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<Border BorderBrush="LightGray" BorderThickness="1"
Grid.Row="0" Grid.Column="0"
Grid.ColumnSpan="6" Grid.RowSpan="3" >
</Border>
<Viewbox Grid.Row="0" >
<Image Name="img_ItemImage"
Source="{Binding Image, Mode=TwoWay }"
Width="20" Height=" 25" />
</Viewbox>
<Viewbox Grid.Column="2" Grid.ColumnSpan="3" VerticalAlignment="Top" >
<TextBlock Name="lbl_ItemName" TextWrapping="Wrap" Width="180" Foreground="Gray"
Text="{Binding Name , Mode=TwoWay }" Tag="{Binding SKU_No,Mode=TwoWay}" >
</TextBlock>
</Viewbox>
<Viewbox Grid.Row="1" Margin="10,0" VerticalAlignment="Top" >
<TextBlock Foreground="Gray" >Qty:</TextBlock>
</Viewbox>
<Viewbox Grid.Row="2" Margin="0,0" VerticalAlignment="Top" >
<StackPanel Orientation="Horizontal" >
<Button Name="btn_Minus" FontWeight="ExtraBold" Padding="0" Width="12"
Resources="{StaticResource cartitembutton}" Click="btn_Minus_Click" >
<Image Source="/Resources\Icons\minus.png" ></Image>
</Button>
<Border BorderThickness="1" Margin="2,0" Width="13" CornerRadius="2" BorderBrush="LightGray" >
<TextBlock Name="lbl_Quantity" FontWeight="Bold" Foreground="Gray"
HorizontalAlignment="Center" VerticalAlignment="Center"
Text="{Binding Quantity , Mode=TwoWay }">
</TextBlock>
</Border>
<Button Name="btn_Increment" FontWeight="ExtraBold" Width="12"
Resources="{StaticResource cartitembutton}"
Padding="0"
Click="btn_Increment_Click">
<Image Source="/Resources\Icons\union_10.png" ></Image>
</Button>
</StackPanel>
</Viewbox>
<Viewbox Grid.Row="1" Grid.Column="2" Margin="5,0"
HorizontalAlignment="Left" Grid.ColumnSpan="3" >
<TextBlock Name="lbl_Price" FontWeight="DemiBold"
Text="{Binding Price , Mode=TwoWay}" ></TextBlock>
</Viewbox>
<Viewbox Grid.Row="2" Grid.Column="2" Grid.ColumnSpan="3"
VerticalAlignment="Top" Margin="0,0" >
<TextBlock Name="lbl_Appearence"
Text="{Binding Appearance , Mode=TwoWay }"
TextWrapping="Wrap" Foreground="Gray" Width="210" >
</TextBlock>
</Viewbox>
<Viewbox Grid.Column="5" HorizontalAlignment="Center" VerticalAlignment="Top" Margin="2,2"
>
<Button Name="btn_DeleteItem"
Click="btn_DeleteItem_Click"
Resources="{StaticResource cartitembutton}" >
<Image Source="/Resources/Icons/delete.png" ></Image>
</Button>
</Viewbox>
</Grid>
</Viewbox>
</DataTemplate>
</ListView.ItemTemplate>
You should use data binding to retrieve the selected item. The source property will be automatically updated when the ListView.SelectedItem changes.
Touch is handled the same way as click is handled. The framework converts touch events to mouse events.
I noticed that you wrapped every element into a ViewBox. That is not necessary and will only degrade performance. When the elements are hosted inside a Grid they will resize automatically by default. Exceptions are elements that need an initial size like Shape or Image. But since the item containers won't resize themselves, the content of the containers won't resize too.
To force all elements to occupy max horizontal space you can set a Style that targets the item container:
<ListView.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Setter Property="HorizontalContentAlignment"
Value="Stretch" />
</Style>
</ListView.ItemContainerStyle>
MainWindow.xaml.cs
public partial class MainWindow : Window
{
public static readonly DependencyProperty ItemsProperty = DependencyProperty.Register(
"Items",
typeof(ObservableCollection<Item>),
typeof(MainWindow),
new PropertyMetadata(default(ObservableCollection<Item>)));
public ObservableCollection<Item> Items
{
get => (ObservableCollection<Item>) GetValue(MainWindow.ItemsProperty);
set => SetValue(MainWindow.ItemsProperty, value);
}
public static readonly DependencyProperty SelectedItemProperty = DependencyProperty.Register(
"SelectedItem",
typeof(Item),
typeof(MainWindow),
new PropertyMetadata(default(Item), MainWindow.OnSelectedItemChanged));
public Item SelectedItem
{
get => (Item) GetValue(MainWindow.SelectedItemProperty);
set => SetValue(MainWindow.SelectedItemProperty, value);
}
public MainWindow()
{
InitializeComponent();
this.DataContext = this;
this.Items = new ObservableCollection<Item>();
// Initialize data source
CreateItems();
}
// Property changed callback of the SelectedItem property
private static void OnSelectedItemChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
// Reference to instance members in a class scope
var _this = d as MainWindow;
if (e.NewValue is ItemCollection selectedItem)
{
// Handle currently selected item
}
}
}
MainWindow.xaml
<Window>
<ListView ItemsSource="{Binding Items}"
SelectedItem="{Binding SelectedItem}" />
</Window>

How to access a specific item in itemscontrol and retrieve some data in UWP

I have an ItemsControl with DataTemplate in my Page.Xaml and the code is like below:
<ItemsControl x:Name="chatUI" VerticalAlignment="Bottom">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid x:Name="myGrid" Width="340" Background="{Binding Background}" HorizontalAlignment="{Binding GridHorizontalAlign}" Margin="10,0,10,10" MinHeight="45" BorderBrush="#FF003A4F" BorderThickness="0,0,0,2">
<Polygon Visibility="{Binding RightVisibility}" Fill="{Binding Background}" Points="0,0 5,6, 0,12" VerticalAlignment="Top" HorizontalAlignment="Right" Margin="0,0,-5,0" />
<Polygon Visibility="{Binding LeftVisibility}" Fill="{Binding Background}" Points="5,0 0,6, 5,12" VerticalAlignment="Top" HorizontalAlignment="Left" Margin="-5,0,0,0" />
<Grid>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<TextBlock Text="{Binding Text}" TextWrapping="Wrap" FontSize="15" FontFamily="Segoe UI" Foreground="White" Margin="10,10,10,0"/>
<TextBlock Grid.Row="1" Text="{Binding Time}" TextWrapping="Wrap" FontSize="11" FontFamily="Segoe UI" Foreground="LightGray" Margin="10,0,10,5" VerticalAlignment="Bottom" TextAlignment="Right"/>
</Grid>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
What I need right now is getting Text which is bound to the TextBlock when I right click on the grid named myGrid. How is that possible in C#?
We can add the RightTapped event of the Grid, it will be fired when you right click the Grid.
In the RightTapped event we can use Grid.Children to get the collection of child elements of the Grid. That we can get the Grid in the root Grid that named myGrid. That we can use the Grid.Children to get the TextBlock in the Grid.
For example:
private async void myGrid_RightTapped(object sender, RightTappedRoutedEventArgs e)
{
var RightTapGrid = sender as Grid;
var childernElements = RightTapGrid.Children;
foreach (var item in childernElements)
{
var grid = item as Grid;
if (grid != null)
{
var itemchildernElements = grid.Children;
foreach (var text in itemchildernElements)
{
var textBlock = text as TextBlock;
var dialog = new ContentDialog()
{
Title = textBlock.Text,
MaxWidth = this.ActualWidth
};
dialog.PrimaryButtonText = "OK";
dialog.SecondaryButtonText = "Cancel";
await dialog.ShowAsync();
break;
}
}
}
}
If you get your Binding Data from Class called ClassName
You can try this code
XAML:
<ListView x:Name="chatUI" VerticalAlignment="Bottom" SelectionChanged="chatUI_SelectionChanged">
<ListView.ItemTemplate>
<DataTemplate>
<Grid x:Name="myGrid" Width="340" Background="{Binding Background}" HorizontalAlignment="{Binding GridHorizontalAlign}" Margin="10,0,10,10" MinHeight="45" BorderBrush="#FF003A4F" BorderThickness="0,0,0,2">
<Polygon Visibility="{Binding RightVisibility}" Fill="{Binding Background}" Points="0,0 5,6, 0,12" VerticalAlignment="Top" HorizontalAlignment="Right" Margin="0,0,-5,0" />
<Polygon Visibility="{Binding LeftVisibility}" Fill="{Binding Background}" Points="5,0 0,6, 5,12" VerticalAlignment="Top" HorizontalAlignment="Left" Margin="-5,0,0,0" />
<Grid>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<TextBlock Text="{Binding Text}" TextWrapping="Wrap" FontSize="15" FontFamily="Segoe UI" Foreground="White" Margin="10,10,10,0"/>
<TextBlock Grid.Row="1" Text="{Binding Time}" TextWrapping="Wrap" FontSize="11" FontFamily="Segoe UI" Foreground="LightGray" Margin="10,0,10,5" VerticalAlignment="Bottom" TextAlignment="Right"/>
</Grid>
</Grid>
</DataTemplate>
</Listview.ItemTemplate>
And add SelectionChanged Event :
private void chatUI_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
ListView view = (ListView)sender;
//Get Selected Item
ClassName class = view.SelectedItem as ClassName;
string path = class.Text;
// Now we have Text of selected item in Listview
}

How to add ListView with datatemplate to Button Flyout in windows store app 8.1 c#

I have a requirement like when I click on Button Flyout should come with the list of dynamic data and specified template. Below is the code in Xaml. But the Flyout is not Loading with any data.
<Button Content="Folders" >
<FlyoutBase.AttachedFlyout>
<Flyout >
<ListView x:Name="lstEmailFolder" >
<ListView.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="40"/>
</Grid.ColumnDefinitions>
<Image Source="/Images/Favorite_icon.png" Height="30" Width="30" Grid.Column="1" />
<TextBlock Text="{StaticResource Foldername}" Width="30" Height="30" Foreground="White" FontSize="20"/>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Flyout>
</FlyoutBase.AttachedFlyout>
</Button>
You havent bind Itemsource property to Listview and instead of Text="{StaticResource Foldername}" use Text="{Binding Foldername}"
xaml
<Button Content="Display Flyout">
<Button.Flyout>
<Flyout>
<ListView x:Name="lstEmailFolder" >
<ListView.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="40"/>
</Grid.ColumnDefinitions>
<TextBlock Text="{Binding Foldername}" Width="30" Height="30" Foreground="White" FontSize="20"/>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Flyout>
</Button.Flyout>
</Button>
c#
this.InitializeComponent();
List<FlyoutData> data = new List<FlyoutData>();
data.Add(new FlyoutData("Folder1"));
data.Add(new FlyoutData("Folder2"));
lstEmailFolder.ItemsSource = data;
public class FlyoutData
{
public string Foldername { get; set; }
public FlyoutData(string Foldername)
{
this.Foldername = Foldername;
}
}

Binding ObservableCollection of List

In my Windows Phone application I have a listBox with ContentItems binding :
private ObservableCollection<ContentItemViewModel> _contentItems;
public ObservableCollection<ContentItemViewModel> ContentItems
{
get { return _contentItems; }
}
<ListBox x:Name="ContentListBox" Margin="0,117,12,0" VirtualizingStackPanel.VirtualizationMode="Standard" Logic1:TiltEffect.IsTiltEnabled="True" ItemsSource="{Binding ContentItems}" Tap="ContentListBox_Tap" MinHeight="656" >
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="vertical" >
<Grid Height="{Binding ItemHeight}" >
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Image Grid.Column="0" x:Name="itemIco1" Width="Auto" Height="Auto" HorizontalAlignment="Left" Source="{Binding IconURL}" Stretch="Fill" CacheMode="BitmapCache" VerticalAlignment="Top" Margin="5,5,5,5" Visibility="Visible"/>
<ListBox IsHitTestVisible="False" Grid.Column="1" VerticalAlignment="Center" >
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
</Style>
</ListBox.ItemContainerStyle>
<TextBlock x:Name="ContentCategoryTitle" Height="70" Text="{Binding ContentTitle}" Width="460" Margin="5,34,0,0" TextTrimming="WordEllipsis" TextWrapping="NoWrap" FontSize="28" FontFamily="Segoe WP Semibold" Foreground="#FFF7F7F7" VerticalAlignment="Bottom" />
</ListBox>
</Grid>
<Rectangle Fill="#FF585858" Height="1" Margin="0,0,0,0" Width="460" VerticalAlignment="Bottom" HorizontalAlignment="Left" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
Is it possible to binding not an ObservableCollection<ContentItemViewModel>, but - ObservableCollection<List<ContentItemViewModel>> ?
Yes that is possible, if you have a collection of collections. Or why not this?
ObservableCollection<ObservableCollection<ContentItemViewModel>>
If you want your UI to be notified of collection changes to your sub collections.
Update
For example:
View Model
public ObservableCollection<ObservableCollection<ContentItemViewModel>> ContentItems
{
get { return _contentItems; }
set { _contentItems = value; // Notify of property change here, this allows you to change the ContentItems reference after view model construction }
}
public MyViewModel()
{
// Populate content items
this.ContentItems = new ObservableCollection
{
new ObservableCollection { new ContentItemViewModel() },
new ObservableCollection { new ContentItemViewModel(), new ContentItemViewModel() }
};
}
View
<ListBox ItemsSource="{Binding ContentItems}" ...>
<ListBox.ItemTemplate>
<DataTemplate>
<Grid>
<ListBox ItemsSource="{Binding}">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid>
<TextBlock Text="{Binding MyContentItemViewModelProperty}" />
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
</DataTemplate>
<ListBox.ItemTemplate>
</ListBox>

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