Currently, I've got a ListView implementation that looks something like this:
{Alert1}
{Alert2}
{Alert3}
{Alert4}
{Alert5}
{Alert6]
{Alert7}
xaml:
<ListView Grid.Row="4"
ItemsSource="{Binding Alerts}"
HasUnevenRows="True"
VerticalOptions="Start"
SeparatorVisibility="None" Margin="10,0"
x:Name="AlertsList">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Frame BackgroundColor="#333333" Margin="0,5" Padding="5">
<StackLayout Margin="0" Padding="0">
<Label
Text="{Binding Name, Mode=OneWay}"
FontAttributes="Bold"
FontSize="Large"
HorizontalOptions="Center"
Margin="0" />
<Label
Text="{Binding Value, Mode=OneWay}"
HorizontalOptions="Center"
FontSize="Medium"
Margin="0" />
</StackLayout>
</Frame>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
Any suggestion on how to modify this so that the output is displayed in a 2 column grid instead with equal width columns such as?
{Alert1}{Alert2}
{Alert3}{Alert4}
{Alert5}{Alert6]
{Alert7}
I'm using Xamarin Forms v2.3.3
As Jason said,you could upgrade your XF version and use CollectionView with its ItemsLayout property.
<CollectionView ItemsSource="{Binding Alerts}"
ItemsLayout="VerticalGrid, 2">
<CollectionView.ItemTemplate>
<DataTemplate>
<Frame BackgroundColor="#333333" Margin="0,5" Padding="5">
<StackLayout Margin="0" Padding="0">
<Label
Text="{Binding Name, Mode=OneWay}"
FontAttributes="Bold"
FontSize="Large"
HorizontalOptions="Center"
Margin="0" />
<Label
Text="{Binding Value, Mode=OneWay}"
HorizontalOptions="Center"
FontSize="Medium"
Margin="0" />
</StackLayout>
</Frame>
</DataTemplate>
</CollectionView.ItemTemplate>
</CollectionView>
The more you could refer to the doc.
Related
In my Xamarin Forms app, I have a CarouselView to swipe through messages. Some messages have attachments. I would like to hide the StackLayout attachmentsLayout when the Attachments list has no items.
I tried to play with DataTriggers but it did not work.
<?xml version="1.0" encoding="UTF-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:local="clr-namespace:MyApp.Helpers" x:Class="MyApp.MailboxConversationPage" Title="Messages">
<ContentPage.Content>
<AbsoluteLayout x:Name="absLayout" VerticalOptions="FillAndExpand">
<StackLayout HorizontalOptions="Fill" HeightRequest="{Binding Path=Height, Source={x:Reference absLayout}}" WidthRequest="{Binding Path=Width, Source={x:Reference absLayout}}">
<StackLayout VerticalOptions="Start" Padding="10,10,10,5">
<Label x:Name="Subject" Text="Subject" FontSize="Large" FontAttributes="Bold" />
</StackLayout>
<StackLayout x:Name="carouselViewLayout" VerticalOptions="FillAndExpand">
<ContentView HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand" HeightRequest="{Binding Path=Height, Source={x:Reference carouselViewLayout}}" WidthRequest="{Binding Path=Width, Source={x:Reference carouselViewLayout}}">
<CarouselView x:Name="CarouselMessages" PositionChanged="OnPositionChanged">
<CarouselView.ItemTemplate>
<DataTemplate>
<StackLayout HorizontalOptions="Fill" BackgroundColor="#f5f5f5">
<StackLayout VerticalOptions="Start" Padding="10,10,10,5">
<Label Text="{Binding Sender}" FontAttributes="Bold" />
</StackLayout>
<StackLayout VerticalOptions="FillAndExpand" Padding="10,10,10,10" BackgroundColor="White">
<ScrollView>
<Label Text="{Binding Body}" />
</ScrollView>
</StackLayout>
<StackLayout x:Name="attachmentsLayout" BindableLayout.ItemsSource="{Binding Attachments}" VerticalOptions="End" Padding="10,10,10,10" BackgroundColor="White">
<BindableLayout.ItemTemplate>
<DataTemplate>
<Label>
<Label.FormattedText>
<FormattedString>
<local:HyperlinkSpan Text="{Binding Filename}" Url="{Binding Url}" />
</FormattedString>
</Label.FormattedText>
</Label>
</DataTemplate>
</BindableLayout.ItemTemplate>
</StackLayout>
<StackLayout VerticalOptions="End" Padding="10,5,10,10">
<Label Text="{Binding Created_At}" BackgroundColor="#f5f5f5" />
</StackLayout>
</StackLayout>
</DataTemplate>
</CarouselView.ItemTemplate>
</CarouselView>
</ContentView>
</StackLayout>
<StackLayout x:Name="editorLayout" VerticalOptions="FillAndExpand" IsVisible="false" Padding="10,0,10,0">
<Frame x:Name="replyFrame" HeightRequest="{Binding Path=Height, Source={x:Reference editorLayout}}" HasShadow="false" OutlineColor="Gray" Padding="2,0,2,0">
<Editor x:Name="replyEditor">
<Editor.BackgroundColor>
<OnPlatform x:TypeArguments="Color"
iOS="White"
Android="Transparent"
WinPhone="#2c3e50" />
</Editor.BackgroundColor>
</Editor>
</Frame>
</StackLayout>
<StackLayout VerticalOptions="End" Padding="10,3,10,10">
<Button x:Name="replyButton" Text="Reply" Clicked="OnReplyActivated" BorderRadius="5" BackgroundColor="#337ab7" TextColor="White" FontAttributes="Bold" />
<Button x:Name="sendButton" Text="Send Message" Clicked="OnSendMessageActivated" BorderRadius="5" BackgroundColor="#337ab7" TextColor="White" FontAttributes="Bold" IsVisible="false"/>
</StackLayout>
</StackLayout>
<ContentView x:Name="overlay" AbsoluteLayout.LayoutBounds="0, 0, 1, 1" AbsoluteLayout.LayoutFlags="All" IsVisible="True" BackgroundColor="#C0808080" Padding="10, 0">
<ActivityIndicator WidthRequest="110" HeightRequest="70" IsRunning="True" IsVisible="True" Color="Black" HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand"/>
</ContentView>
</AbsoluteLayout>
</ContentPage.Content>
</ContentPage>
Why don't you simply add another property to your ViewModel that indicates whether there are any items in your Attachments collection. Then bind IsVisible of the layout to this property
View
<StackLayout x:Name="attachmentsLayout"
IsVisible="{Binding HasItems}"
BindableLayout.ItemsSource="{Binding Attachments}"
VerticalOptions="End" Padding="10,10,10,10" BackgroundColor="White">
<BindableLayout.ItemTemplate>
<DataTemplate>
<Label>
<Label.FormattedText>
<FormattedString>
<local:HyperlinkSpan Text="{Binding Filename}" Url="{Binding Url}" />
</FormattedString>
</Label.FormattedText>
</Label>
</DataTemplate>
</BindableLayout.ItemTemplate>
</StackLayout>
ViewModel
public bool HasItems => Attachments.Any();
This is my code
<ListView x:Name="listViewClient" ItemsSource="{Binding Client}" HasUnevenRows="True">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell >
<Grid Margin="10">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="5"/>
<ColumnDefinition />
</Grid.ColumnDefinitions>
<BoxView Grid.Column="0" Color="#84DCC6"/>
<StackLayout Grid.Column="1" Padding="20, 10">
<Frame BorderColor="WhiteSmoke">
<StackLayout>
<Label Text="Name:" FontSize="16" />
<Label FontSize="Medium" Text="{Binding Name}" FontAttributes="Bold" />
</StackLayout>
</Frame>
<Frame BorderColor="WhiteSmoke">
<StackLayout>
<Label Text="Adress:" FontSize="16"/>
<Label FontSize="Medium" Text="{Binding Adress}" FontAttributes="Bold"/>
</StackLayout>
</Frame>
<Frame BorderColor="WhiteSmoke">
<StackLayout>
<Label Text="Place:" FontSize="16"/>
<Label FontSize="Medium" Text="{Binding Place}" FontAttributes="Bold" />
</StackLayout>
</Frame>
<Frame BorderColor="WhiteSmoke" >
<Grid >
<StackLayout Grid.Column="0">
<Label Text="Mobile:" FontSize="16"/>
<Label FontSize="Medium" Text="{Binding Mobile}" FontAttributes="Bold" />
</StackLayout>
<Button Grid.Column="1" Text="Call" Clicked="PovikajPartnerClicked" BackgroundColor="#84DCC6"></Button>
</Grid>
</Frame>
<Frame BorderColor="WhiteSmoke">
<StackLayout>
<Label Text="Е-mail:" FontSize="16"/>
<Label FontSize="Medium" Text="{Binding EMAIL}" FontAttributes="Bold" />
</StackLayout>
</Frame>
<Frame BorderColor="WhiteSmoke">
<StackLayout>
<Label Text="LAW:" FontSize="16"/>
<Label FontSize="Medium" Text="{Binding LAW}" FontAttributes="Bold" />
</StackLayout>
</Frame>
<Frame BorderColor="WhiteSmoke
">
<StackLayout>
<Label Text="SECNUM:" FontSize="16"/>
<Label FontSize="Medium" Text="{Binding SECNUM}" FontAttributes="Bold" />
</StackLayout>
</Frame>
</StackLayout>
</Grid>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
I dont know from where get that orange background color when i tap on the listview. From the code you can see that i dont have choosed samo backgroud color . Is there a default tap event to make the color orange? I tried everything but cant find is there anyplace i forgot to add a color.
I know this may be a bit late, but I hope it will help someone, Just go your styles.xml file under AppName.Android/Resources/values and inside your Main Theme add the following:
<item name="android:colorActivatedHighlight">#android:color/transparent</item>
That is the default selection colour of your ListView that comes from the theme of your App that Xamarin by default has set in the template to solve it just add the following to your ListView
<ListView SelectionMode="None" ..../>
I am late to the party, but this solution I found on Grepper might be helpful. It is simple and is unique for each content page.
You can alter the background color of the current cell and the previous cell using the ViewCell Tapped event.
XAML:
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell Tapped="ViewCell_Tapped" >
<Label Text="{Binding Name}" TextColor="DarkGoldenrod" />
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
In your code add:
ViewCell lastCell;
private void ViewCell_Tapped(object sender, System.EventArgs e)
{
if (lastCell != null)
lastCell.View.BackgroundColor = Color.Transparent;
var viewCell = (ViewCell)sender;
if (viewCell.View != null)
{
viewCell.View.BackgroundColor = Color.LightGray;
lastCell = viewCell;
}
}
I have a listview with itemSource from viewModel but i need to bind a label text in this listview to outside the itemSource
<ListView
ItemsSource="{Binding reports, Mode=TwoWay}"
HasUnevenRows="True" ItemTapped="ListView_ItemTapped"
VerticalOptions="Center" SeparatorVisibility="Default"
SeparatorColor="Black" x:Name="listview">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Frame Padding="0.20" Margin="2">
<Grid x:Name="gridview">
<BoxView Grid.Column="0" Grid.Row="0" BackgroundColor="Black" WidthRequest="1" VerticalOptions="Center" HorizontalOptions="End"/>
<Label Text="{Binding Governerate}" Grid.Column="0"/>
<BoxView Grid.Column="1" Grid.Row="0" BackgroundColor="Black" WidthRequest="1" VerticalOptions="Center" HorizontalOptions="End"/>
<Label Text="{Binding VisitCount}" Grid.Column="2" x:Name="visitcounts" TextColor="Red"/>
<BoxView Grid.Column="2" Grid.Row="0" BackgroundColor="Black" WidthRequest="1" VerticalOptions="Center" HorizontalOptions="End"/>
<Label Text="{Binding item outside itemsource}" Grid.Column="3"/>
<Label Grid.Column="1"/>
</Grid>
</Frame>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
That easy you do it something like this:
First, give your ListView a name(Already there)
Then In the Binding use that name as a Reference for the Binding Context:
Text="{Binding Path=BindingContext.YourItem, Source={x:Reference listview}}"
Where YourItem is the Name of your string Property outside the ItemsSource
PFB the code for my list view,
<ListView HasUnevenRows="true" ItemsSource="{Binding UserEmailList}" IsGroupingEnabled="true">
<ListView.GroupHeaderTemplate>
<DataTemplate>
<ViewCell>
<ViewCell.View>
<StackLayout Orientation="Vertical" Spacing="0" Margin="0" Padding="0">
<BoxView Style="{StaticResource separator}"></BoxView>
<Label Text="{Binding Heading}" Style="{StaticResource labelHeaderTitle}" />
<BoxView Style="{StaticResource separator}"></BoxView>
</StackLayout>
</ViewCell.View>
</ViewCell>
</DataTemplate>
</ListView.GroupHeaderTemplate>
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<ViewCell.View>
<StackLayout Orientation="Horizontal" Spacing="0" >
<StackLayout IsVisible="{Binding UserEmailDetails.HasEmailAddress}" Orientation="Horizontal" HorizontalOptions="FillAndExpand">
<Label Text="{Binding UserEmailDetails.EmailAddress}" Style="{StaticResource labelListItem}" HorizontalOptions="FillAndExpand">
<Label.GestureRecognizers>
<TapGestureRecognizer Tapped="SelectEmailAddress_Tapped" CommandParameter="{Binding UserEmailDetails}" />
</Label.GestureRecognizers>
</Label>
<Image HeightRequest="16" HorizontalOptions="End" VerticalOptions="Center" Source="arrow.png" Margin="0,0,15,0">
</Image>
</StackLayout>
<StackLayout IsVisible="{Binding UserEmailDetails.HasEmailAddress, Converter={StaticResource NotConverter}}" Padding="15,0,0,0">
<Label Text="Add email" Style="{StaticResource labelLink}">
<Label.GestureRecognizers>
<TapGestureRecognizer Tapped="SelectEmailAddress_Tapped" CommandParameter="{Binding UserEmailDetails}" />
</Label.GestureRecognizers>
</Label>
</StackLayout>
</StackLayout>
</ViewCell.View>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
Even if there are only two rows, on IOS multiple empty rows are getting populated as in the below snapshot.
Please let me know how to avoid this and hav things working in both Android and IOS
I would hide the Separator by setting SeparatorVisibility="None" on ListView Property. If you still need the Separator I would define in the ViewCell.
<ListView HasUnevenRows="true" SeparatorVisibility="None">
The other way is to put Empty Footer on List View:
<ListView>
<ListView.Footer>
<Label />
</ListView.Footer>
</ListView>
I hope one of these helps you. Let me know if anything.
In my Xamarin.Forms app, I have a ListView:
<ListView ItemsSource="{Binding MyItems}"
Grid.Row="1"
Margin="0,20,0,0">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Label Text="ABC" FontSize="Large" TextColor="Black" BackgroundColor="Red" Margin="20" HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand"/>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
Where the "ABC" should appear, is only a thin red line for the background of the label. I don't see the actually letters. I've made many ListView before with no problem, I don't know what I'm doing wrong here?
ViewCell needs to contain a layout control, otherwise it will not render correctly.
For simplicity, you could implement a StackLayout:
<ListView
ItemsSource="{Binding MyItems}"
Grid.Row="1"
Margin="0,20,0,0>
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout
HorizontalOptions="FillAndExpand"
Margin="0"
Padding="0"
Spacing="0"
VerticalOptions="Fill">
<Label
BackgroundColor="Red"
FontSize="Large"
HorizontalOptions="FillAndExpand"
HorizontalTextAlignment="Center"
Margin="20"
Text="ABC"
TextColor="Black"
VerticalOptions="FillAndExpand"
VerticalTextAlignment="Center"/>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>