Develop Reference

Xamarin - Frame.GestureRecognizers doesn't work when tapped

I have a Xamarin project with a view of a product's details. I have two buttons which can increase or decrease the quantity of the product. To show how it changes I have a label named lblQuantity which shows the quantity and it's updated if you tap on the remove or add button.
To have some context here's the view
The issue is that the lblQuantity isn't updating itself. I had previously another view with a stacklayout and the gesture recognizers worked fine. Now it doesn't even go inside the method.
Here's the xaml
<?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:controls="clr-namespace:AppCrijoya.Controls"
x:Class="AppCrijoya.Views.ProductDetailPage">
<ScrollView>
<StackLayout VerticalOptions="FillAndExpand" BackgroundColor="White" Spacing="0" Margin="0" Padding="0">
<Grid BackgroundColor="White" RowSpacing="0">
<Grid.RowDefinitions>
<RowDefinition Height="auto" />
<RowDefinition Height="auto" />
</Grid.RowDefinitions>
<!-- 1. Profile picture-->
<Frame HasShadow="True" Margin="10" CornerRadius="20">
<Image x:Name="ProductImage" Aspect="AspectFit" Grid.Row="0" Margin="0" VerticalOptions="Start" HeightRequest="230"/>
</Frame>
<!-- Here add the code that is being explained in the next block-->
<StackLayout HeightRequest="90" Grid.Row="1" BackgroundColor="Transparent" VerticalOptions="Start">
<StackLayout Padding="20" BackgroundColor="Transparent">
<!-- Here add the code that is being explained in the next block-->
<!-- Blocks: 3 and 4 -->
<Grid Padding="25,5,25,0" RowSpacing="0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="auto"/>
<ColumnDefinition Width="30"/>
<ColumnDefinition Width="auto"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="80"/>
</Grid.RowDefinitions>
<!-- Here add the code that is being explained in the next block-->
<!-- 4. Contact information-->
<Label x:Name="txtName" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="4" FontAttributes="Bold" FontSize="30" TextColor="Black"/>
<Label x:Name="txtDescription" Grid.Row="1" Grid.ColumnSpan="4" TextColor="Black" FontSize="16"/>
<Label Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="4" Padding="0,10,0,0" FontSize="16">
<Label.FormattedText>
<FormattedString>
<Span Text="Stock: " FontAttributes="Bold" TextColor="Black"/>
<Span x:Name="txtDetails" TextColor="black"/>
</FormattedString>
</Label.FormattedText>
</Label>
<!--4. Contact information: Board inforation-->
<Label Grid.Row="2" Grid.Column="2" Grid.ColumnSpan="3" Text="Quantity" FontAttributes="Bold" Style="{StaticResource stlBoardTitle}" />
<Frame Grid.Column="2" Grid.Row="3" Style="{StaticResource stkCart}">
<Frame.GestureRecognizers>
<TapGestureRecognizer x:Name="RemoveTap" Tapped="RemoveTap_Tapped"/>
</Frame.GestureRecognizers>
<Label Text="-" Style="{StaticResource lblCart}"/>
</Frame>
<StackLayout Grid.Column="3" Grid.Row="3" HeightRequest="40" VerticalOptions="Center" >
<Label
x:Name="lblQuantity"
Text="1"
FontSize="17"
TextColor="Black"
HorizontalTextAlignment="Center"
VerticalTextAlignment="Center"
HeightRequest="40"/>
</StackLayout>
<Frame Grid.Column="4" Grid.Row="3" Style="{StaticResource stkCart}">
<Frame.GestureRecognizers>
<TapGestureRecognizer x:Name="AddTap" Tapped="AddTap_Tapped"/>
</Frame.GestureRecognizers>
<Label Text="+" Style="{StaticResource lblCart}"/>
</Frame>
</Grid>
</StackLayout>
</StackLayout>
</Grid>
<controls:MyFrame HasShadow="true" HeightRequest="80" BackgroundColor="#e5d3c2" VerticalOptions="EndAndExpand">
<StackLayout WidthRequest="20" VerticalOptions="Center">
<Grid ColumnSpacing="0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="auto"/>
</Grid.ColumnDefinitions>
<Label
x:Name="txtPrice"
Grid.Column="0"
HorizontalTextAlignment="End"
TextColor="White"
HorizontalOptions="Center"
VerticalOptions="Center"
FontAttributes="Bold"
FontSize="25"
/>
<Button CornerRadius="30"
x:Name="btnAddToCart"
Clicked="BtnAddToCart_Clicked"
Grid.Column="2"
TextColor="Black"
Text="Añadir al carrito"
BackgroundColor="White"
Style="{StaticResource btn}"
FontAttributes="Bold"
/>
</Grid>
</StackLayout>
</controls:MyFrame>
</StackLayout>
</ScrollView>
</ContentPage>
Here's the Add and Remove method that I know work fine
private void RemoveTap_Tapped(object sender, EventArgs e)
{
int quantity = Convert.ToInt32(lblQuantity.Text);
if (quantity > 1)
{
quantity -= 1;
}
lblQuantity.Text = quantity.ToString();
}
private void AddTap_Tapped(object sender, EventArgs e)
{
int quantity = Convert.ToInt32(lblQuantity.Text);
quantity += 1;
lblQuantity.Text = quantity.ToString();
}
The text of the label is supossed to be changed but it isn't. And as I said it doesn't even enter on the method.
I don't know what's the issue. Please help and thanks.
EDIT
I have tried changing it for a Button but still doesn't work. I thought it might be a problem with the grid but I still don't know.

I fixed the issue by making sure the frames where inside the StackLayout as they weren't before
Here is an image to explain it
The frames to add or remove weren't inside the red StackLayout so the tap gesture recognizer wouldn't do anything. I just gave it more height and set the Aspect to FillAndExpand

How to display ListView on top of (over the) other items in Xamarin Forms?

I have a ListView that displays recent Search items. I have added it in the Stack Layout of my Main page. I want to show ListView over the other UI elements just like this: How can it be done.
I am currently using a new Page just for SearchBar and ListView. On the mainpage I have just a Search Button, when I click on that button, app navigates to the new Page that contains SearchBar and ListView. But I want it done on the same page. When Search button is clicked, SearchBar and ListView show become visible over the other UI elements.
Here is my code:
On MainPage.xaml
<Button Text="Search" Clicked="SearchButtonPressed" />
C# Code
void SearchButtonPressed(object sender, EventArgs e)
{
Navigation.PushAsync(new SearchPage());
}
SearchPage.xaml Code
<StackLayout>
<SearchBar x:Name="SearchBar"
TextChanged="Handle_SearchButtonPressed"
Placeholder="Search places..."
CancelButtonColor="Red" />
<ListView x:Name="ListView" ItemsSource="{Binding Source=list}" RowHeight="50" IsVisible="True">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell Tapped="ViewCell_Tapped">
<Label Text="{Binding}" TextColor="Black" VerticalOptions="Center" />
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>

you can do it with a grid:
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Entry Grid.Row="0"
Placeholder="SearchItem"
TextChanged="Entry_TextChanged"/>
<Image Grid.Row="1"
Aspect="Fill"
Source="testImage.png"/>
<ListView x:Name="ListView"
Grid.Row="1"
VerticalOptions="Start"
HorizontalOptions="Fill"
IsVisible="False"
HeightRequest="300"
BackgroundColor="White"
Opacity="0.8">
<ListView.ItemTemplate>
<DataTemplate>
<TextCell Text="{Binding}"/>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Grid>
if the text of the search entry changed, show the listview:
private void Entry_TextChanged(object sender, TextChangedEventArgs e)
{
ListView.IsVisible = e.NewTextValue.Length > 0;
}

If you put the list which you will use for suggestion to the bottom of xaml hierarchy, you will resolve it without navige to another page. In addition, if you use the searchbar and listview in the grid and give a same row, they will overlap. Ex:
<Grid RowSpacing="0">
<Grid.RowDefinitions>
<RowDefinition Height="50" />
<RowDefinition Height="1" />
<RowDefinition Height="*" />
<RowDefinition Height="90" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="350" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<SearchBar
Grid.ColumnSpan="3"
BackgroundColor="White"
CancelButtonColor="Red"
IsSpellCheckEnabled="False">
<SearchBar.Margin>
<OnPlatform Android="0,0,0,-5" />
</SearchBar.Margin>
</SearchBar>
<Label
Grid.Row="1"
Grid.ColumnSpan="3"
BackgroundColor="Gray" />
<Frame
Grid.Row="3"
Grid.Column="1"
Margin="0,21,0,21"
Padding="8"
BackgroundColor="White"
BorderColor="Red"
CornerRadius="20"
HasShadow="False"
VerticalOptions="End">
<Grid ColumnSpacing="0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="30" />
</Grid.ColumnDefinitions>
<Label
Margin="5,0,0,0"
Text="Test"
TextColor="Red" />
</Grid>
</Frame>
<StackLayout
Grid.Row="2"
Grid.ColumnSpan="3"
BackgroundColor="White"
Opacity="0.8"
VerticalOptions="End">
<Label
x:Name="LabelDescription"
Grid.Row="1"
Grid.ColumnSpan="3"
HorizontalOptions="Center"
HorizontalTextAlignment="Center"
Text="Test 2"
TextColor="Red" />
</StackLayout>
<BoxView
Grid.Row="2"
Grid.ColumnSpan="3" />
<ListView
Grid.RowSpan="3"
Grid.ColumnSpan="3"
Margin="0,50.5,0,0"
BackgroundColor="White"
HorizontalScrollBarVisibility="Never"
ItemsSource="{Binding SuggestionItems}"
RowHeight="42"
SeparatorVisibility="None"
VerticalOptions="Start"
VerticalScrollBarVisibility="Never">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Grid ColumnSpacing="0" RowSpacing="0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="58" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="20" />
<RowDefinition Height="20" />
<RowDefinition Height="1" />
</Grid.RowDefinitions>
<Label
Grid.Column="1"
Margin="0,0,10,0"
Text="{Binding item1}"
VerticalOptions="Center" />
<Label
Grid.Row="1"
Grid.Column="1"
Margin="0,0,10,0"
Text="{Binding item2}"
VerticalOptions="Center" />
<Label
Grid.Row="2"
Grid.ColumnSpan="2"
BackgroundColor="Gray" />
</Grid>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Grid>

Change programmatically the Rows and Columns in Xamarin Forms

I'm filling a grid with an observablecollection from my viewmodel but I want to get that grid formatted as follows:
(Note my model has no row/column information just calls the posts as shown in the code)
My code now looks like this:
<StackLayout BindableLayout.ItemsSource="{Binding Posts}">
<BindableLayout.ItemTemplate>
<DataTemplate>
<Grid Margin="5" RowSpacing="0" x:Name="postsTable">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="200"/>
</Grid.RowDefinitions>
<ImageButton Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="1" Source="{Binding postImage}" VerticalOptions="Fill" HorizontalOptions="Fill" Aspect="AspectFill" Clicked="News1_Clicked"/>
<StackLayout Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="1" VerticalOptions="End" HorizontalOptions="Start" Margin="10">
<Label Text="{Binding title}" FontFamily="{StaticResource BoldFont}" StyleClass="titlesqr"/>
<Label Text="{Binding subtitle}" FontFamily="{StaticResource NormalFont}" StyleClass="textsqr"/>
</StackLayout>
</Grid>
</DataTemplate>
</BindableLayout.ItemTemplate>
How can I put the rows / columns /columnspan information to achieve this view?

Xamarin.Forms: issues positioning labels and setting row height?

My xaml has 6 labels that display data. I'm trying to set them, but I'm having trouble doing so. This is how the form should be rendered:
Here's what I've tried so far. Here's the xaml:
<?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:maps="clr-namespace:Xamarin.Forms.Maps;assembly=Xamarin.Forms.Maps"
xmlns:local="clr-namespace:GasStations"
x:Class="GasStations.MainPage">
<Grid RowSpacing="0">
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="50" />
<RowDefinition Height="auto" />
</Grid.RowDefinitions>
<StackLayout Grid.Row="0" x:Name="MapGrid">
<maps:Map WidthRequest="960" HeightRequest="200"
x:Name="MyMap" IsShowingUser="true"/>
</StackLayout>
<StackLayout Grid.Row="1">
<Button Text="Show list" x:Name="Button_DisplayList"
VerticalOptions="CenterAndExpand"
HorizontalOptions="Center"
Clicked="OnButtonClicked" />
</StackLayout>
<StackLayout Grid.Row="2" x:Name="listSection" IsVisible="false" HeightRequest="200">
<ListView x:Name="ListView_Pets">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Grid Padding="10,10,10,10">
<Grid.RowDefinitions>
<RowDefinition Height="300"></RowDefinition>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="200"></ColumnDefinition>
</Grid.ColumnDefinitions>
<StackLayout BackgroundColor="#2FA4D9" Grid.Row="0" Grid.Column="0" HeightRequest="300" WidthRequest="200">
<Label Text="{Binding Name}" FontSize="15" TextColor="White" HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand"/>
<Label Text="{Binding Description}" FontSize="15" TextColor="White" HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand"/>
<Label Text="{Binding Lon}" FontSize="15" TextColor="White" HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand"/>
<Label Text="{Binding Lat}" FontSize="16" TextColor="White" HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand"/>
</StackLayout>
</Grid>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>
</Grid>
</ContentPage>
This is the result. It clearly doesn't look anything like the image above:
Besides all the issues with the labels, what doesn't seem to change is the row height: <RowDefinition Height="300"> doesn't change anything, and neither does HeightRequest="200".
Any help is appreciated.

The ViewCell definition you have defines a Grid with a single cell inside it (one row and one column. From the UI example you have, it looks more like what you want is 2 columns and 3 rows, something like this:
<ViewCell>
<Grid Padding="10,10,10,10">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition Height="Auto"></RowDefinition>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="*"></ColumnDefinition>
</Grid.ColumnDefinitions>
<Label Text="{Binding Name}" FontSize="15" TextColor="Black" Grid.Row="0" Grid.Column="0"/>
<Label Text="{Binding Description}" FontSize="15" TextColor="Black" Grid.Row="1" Grid.Column="0"/>
<Label Text="{Binding Lon}" FontSize="15" TextColor="White" BackgroundColor="#2FA4D9" Grid.Row="0" Grid.Column="1"/>
<Label Text="{Binding Lat}" FontSize="16" TextColor="White" BackgroundColor="#2FA4D9" Grid.Row="1" Grid.Column="1"/>
</Grid>
</ViewCell>
This is based on the code sample you have, so won't completely implement the UI design, but should get closer. The key is to have the Labels in their own cell in the Grid rather than having them all in a single StackLayout.
You will also likely need to set the RowHeight (as Jason noted) or set HasUnevenRows="true" on the ListView.

Uneven space after last row of the grid inside listview in xamarin.forms

I am working in xamarin.forms. I am facing the very silly issue and already wasted 5 hours on it. It's designing issue.
<Grid x:Name="MaingrdForms">
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<ListView Grid.Row="0" x:Name="lstLatestProducts" HasUnevenRows="True"
ItemAppearing="LstLoadmore"
IsPullToRefreshEnabled="true"
Refreshing="LstPulled"
CachingStrategy="RecycleElement">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<ViewCell.View>
<Grid Padding="10">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="2*"/>
<ColumnDefinition Width="4*"/>
<ColumnDefinition Width="0.5*"/>
</Grid.ColumnDefinitions>
<Image Grid.Row="0" Grid.Column="0" Grid.RowSpan="3" HeightRequest="100" WidthRequest="100"
Source="{Binding ProductImg}" Margin="5" VerticalOptions="Center" HorizontalOptions="Center" />
<Label Grid.Row="0" Grid.Column="1" Text="{Binding ProductName}" Style="{StaticResource LabelHeaderStyle}"/>
<Label Grid.Row="1" Grid.Column="1" Text="{Binding ProductDesc}" Style="{StaticResource LabelDescStyle}"/>
<StackLayout Grid.Row="2" Grid.Column="1" Orientation="Horizontal">
<Image Source="icon_password.png"/>
<Label Text="{Binding SubscriptionCategory}" VerticalOptions="Center" HorizontalOptions="Start"/>
<Image Source="icon_password.png"/>
<Label Text="{Binding CreatedDate}" VerticalOptions="Center" HorizontalOptions="Start"/>
</StackLayout>
<Image Grid.Row="0" Grid.Column="2" Grid.RowSpan="3" VerticalOptions="Start" Source="erecall.png"/>
</Grid>
</ViewCell.View>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<Label Grid.Row="0" x:Name="lblNoRecordFound" Text="No Record found" VerticalTextAlignment="Center" HorizontalTextAlignment="Center"/>
</Grid>
In List, I am taking HasUnevenRow=true to set row height but in every row, there is some space after the last row. the height of that space is also different. I can't figure out where is the actual issue.