MAUI swipe recogniser not fier

Haviv Elbsz 1,886 Reputation points
2022-09-04T09:12:01.997+00:00

This is my page
the swipe recogniser not fier
Please what I miss

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="RazKmoShed.MainPage" Loaded="MainPage_Loaded" x:Name="myContentPage"
FlowDirection="LeftToRight" BackgroundColor="Azure" >

    <ScrollView>  
        <VerticalStackLayout x:Name="vLayout" Margin="10" Spacing="5" >  
  
            <Picker x:Name="ExamplesCombo" SelectedIndexChanged="ExamplesCombo_SelectedIndexChanged"  
                        HorizontalTextAlignment="Center" BackgroundColor="Chartreuse"  
                        Title="Select Help Example" TitleColor="Black" FontAttributes="Bold" >  
                <Picker.ItemsSource>  
                    <x:Array Type="{x:Type x:String}">  
                        <x:String>Mul    Example 1</x:String>  
                        <x:String>Mul    Example 2</x:String>  
                        <x:String>Mul    Example 3</x:String>  
                        <x:String>Mul    Example 4</x:String>  
                        <x:String>Mul    Example 5</x:String>  
                        <x:String>Mul    Example 6</x:String>  
                        <x:String>Mul    Example 7</x:String>  
                        <x:String>Mul    Example 8</x:String>  
                        <x:String>Mul    Example 9</x:String>  
                        <x:String>Mul    Example 10</x:String>  
                        <x:String>Mul    Example 11</x:String>  
                        <x:String>Div    Example 1</x:String>  
                        <x:String>Div    Example 2</x:String>  
                        <x:String>Div    Example 3</x:String>  
                        <x:String>Div    Example 4</x:String>  
                        <x:String>Div    Example 5</x:String>  
                        <x:String>Div    Example 6</x:String>  
                        <x:String>Div    Example 7</x:String>  
                        <x:String>Div    Example 8</x:String>  
                        <x:String>Div    Example 9</x:String>  
                        <x:String>Div    Example 10</x:String>  
                        <x:String>Div    Example 11</x:String>  
                        <x:String>Div    Example 12</x:String>  
                        <x:String>Div    Example 13</x:String>  
                        <x:String>Div    Example 14</x:String>  
                        <x:String>AddSub Example 1</x:String>  
                        <x:String>AddSub Example 2</x:String>  
                        <x:String>Add    Example 1</x:String>  
                        <x:String>Add    Example 2</x:String>  
                        <x:String>Add    Example 3</x:String>  
                        <x:String>Add    Example 4</x:String>  
                        <x:String>Sub    Example 1</x:String>  
                        <x:String>Sub    Example 2</x:String>  
                    </x:Array>  
                </Picker.ItemsSource>  
            </Picker>  
  
            <Picker x:Name="ShortOPCombo" SelectedIndexChanged="ShortOPCombo_SelectedIndexChanged"  
                        HorizontalTextAlignment="Center" BackgroundColor="Pink"  
                        Title="Select Puzzle Type" TitleColor="Black" FontAttributes="Bold" >  
                <Picker.ItemsSource>  
                    <x:Array Type="{x:Type x:String}">  
                        <x:String>Mul Puzzle</x:String>  
                        <x:String>Div Puzzle</x:String>  
                        <x:String>AddSub Puzzle</x:String>  
                        <x:String>Add Puzzle</x:String>  
                        <x:String>Sub Puzzle</x:String>  
                        <x:String>Sqr Puzzle</x:String>  
                    </x:Array>  
                </Picker.ItemsSource>  
            </Picker>  
  
            <Picker x:Name="nonParticipantcombo" SelectedIndexChanged="nonParticipantcombo_SelectedIndexChanged"  
                        HorizontalTextAlignment="Center" BackgroundColor="Orange"  
                        Title="Select Non Participants Digits" TitleColor="Black" FontAttributes="Bold" >  
                <Picker.ItemsSource>  
                    <x:Array Type="{x:Type x:String}">  
                        <x:String>Use Any Non Participants Digits</x:String>  
                        <x:String>Use 0 Non Participants Digits</x:String>  
                        <x:String>Use 1 Non Participants Digits</x:String>  
                        <x:String>Use 2 Non Participants Digits</x:String>  
                        <x:String>Use 3 Non Participants Digits</x:String>  
                        <x:String>Use 4 Non Participants Digits</x:String>  
                        <x:String>Use 5 Non Participants Digits</x:String>  
                        <x:String>Use 6 Non participants Digits</x:String>  
                        <x:String>Use 7 Non participants Digits</x:String>  
                        <x:String>Use 8 Non participants Digits</x:String>  
                        <x:String>Use 9 Non participants Digits</x:String>  
                    </x:Array>  
                </Picker.ItemsSource>  
            </Picker>  
  
            <HorizontalStackLayout >  
                <CheckBox x:Name="L2RAlfaBetCKB" IsChecked="False"  
                      CheckedChanged="L2RAlfaBetCKB_CheckedChanged"  
                      HorizontalOptions="Center" VerticalOptions="Center" />  
  
                <Label    Text="Checked = RightToLeft Writing" FontAttributes="Bold"  
                      HorizontalOptions="Start" VerticalOptions="Center" />  
            </HorizontalStackLayout>  
  
            <Editor x:Name="InputTB"   
                        BackgroundColor="LightSkyBlue" FontSize="16" FlowDirection="LeftToRight"  
                        TextChanged="InputTB_TextChanged" TextColor="Black"  
                        Placeholder="Enter alphametic puzzle here" FontAttributes="Bold"  
                        PlaceholderColor="Blue" FontFamily="NCourier"  
                        HorizontalOptions="Fill" VerticalOptions="Start"   
                        HeightRequest="500" WidthRequest="320" >  
<!--  
                <Editor.GestureRecognizers>  
                    <SwipeGestureRecognizer Direction="Left" Swiped="SwipeGestureRecognizer_Swiped"/>  
                    <SwipeGestureRecognizer Direction="Right" Swiped="SwipeGestureRecognizer_Swiped"/>  
                    <SwipeGestureRecognizer Direction="Up" Swiped="SwipeGestureRecognizer_Swiped"/>  
                    <SwipeGestureRecognizer Direction="Down" Swiped="SwipeGestureRecognizer_Swiped"/>  
                    <SwipeGestureRecognizer Threshold="50" />  
                </Editor.GestureRecognizers>  
-->  
            </Editor>  
  
            <HorizontalStackLayout >  
                <CheckBox x:Name="useDigitsItselfCKB" IsChecked="False"  
                      CheckedChanged="useDigitsItselfCKB_CheckedChanged"  
                      HorizontalOptions="Center" VerticalOptions="Center" />  
  
                <Label    Text="Use Digit Itself Value" FontAttributes="Bold"  
                      HorizontalOptions="Start" VerticalOptions="Center" />  
            </HorizontalStackLayout>  
  
            <HorizontalStackLayout >  
                <CheckBox x:Name="alphaCKB" IsChecked="False"  
                      CheckedChanged="alphaCKB_CheckedChanged"  
                      HorizontalOptions="Center" VerticalOptions="Center" />  
  
                <Label    Text="Alpha Free" FontAttributes="Bold"  
                      HorizontalOptions="Start" VerticalOptions="Center" />  
            </HorizontalStackLayout>  
  
            <HorizontalStackLayout >  
                <CheckBox x:Name="fromToCKB" IsChecked="False"  
                      CheckedChanged="fromToCKB_CheckedChanged"  
                      HorizontalOptions="Center" VerticalOptions="Center" />  
  
                <Label    Text="Asterisk Free" FontAttributes="Bold"  
                      HorizontalOptions="Start" VerticalOptions="Center" />  
            </HorizontalStackLayout>  
  
            <HorizontalStackLayout >  
                <CheckBox x:Name="UseOddsEvensCKB" IsChecked="False"  
                      CheckedChanged="UseOddsEvensCKB_CheckedChanged"  
                      HorizontalOptions="Center" VerticalOptions="Center" />  
  
                <Label    Text="EO Use Evens and Odds" FontAttributes="Bold"           
                      HorizontalOptions="Start" VerticalOptions="Center" />  
            </HorizontalStackLayout>  
  
            <HorizontalStackLayout >  
                <CheckBox x:Name="shiftingsCKB" IsChecked="False"  
                      CheckedChanged="shiftingsCKB_CheckedChanged"  
                      HorizontalOptions="Center" VerticalOptions="Center" />  
  
                <Label    Text="Use Terms Shiftings" FontAttributes="Bold"  
                      HorizontalOptions="Start" VerticalOptions="Center" />  
            </HorizontalStackLayout>  
  
            <HorizontalStackLayout >  
                <CheckBox x:Name="ZerosCKB" IsChecked="False"  
                      CheckedChanged="ZerosCKB_CheckedChanged"  
                      HorizontalOptions="Center" VerticalOptions="Center" />  
  
                <Label    Text="Remove Zero Terms" FontAttributes="Bold"           
                      HorizontalOptions="Start" VerticalOptions="Center" />  
            </HorizontalStackLayout>  
  
            <HorizontalStackLayout Spacing="10" >  
                <CheckBox x:Name="UseFromDigitsCKB" IsChecked="False"  
                      CheckedChanged="UseFromDigitsCKB_CheckedChanged"  
                      HorizontalOptions="Center" VerticalOptions="Center" />  
  
                <Label Text="Use These Digits ==>" FontAttributes="Bold"           
                      HorizontalOptions="Start" VerticalOptions="Center" />  
  
                <Entry   x:Name="UseFromDigitsTB" HorizontalOptions="FillAndExpand"  
                         BackgroundColor="Cyan" MinimumWidthRequest="300" FontAttributes="Bold"                   
                         Text="*4 1 2 3 4    " TextChanged="UseFromDigitsTB_TextChanged" />  
  
            </HorizontalStackLayout>  
  
            <HorizontalStackLayout Spacing="10" >  
                <CheckBox x:Name="UseRepetitionCKB" IsChecked="False"  
                      CheckedChanged="UseRepetitionCKB_CheckedChanged"  
                      HorizontalOptions="Center" VerticalOptions="Center" />  
  
                <Label Text="Use Digit Repeat ==>" FontAttributes="Bold"           
                      HorizontalOptions="Start" VerticalOptions="Center" />  
  
  
                <Entry   x:Name="UseRepetitionTB" HorizontalOptions="FillAndExpand"  
                         BackgroundColor="Cyan"  MinimumWidthRequest="300" FontAttributes="Bold"                   
                         Text="= 24    " TextChanged="UseRepetitionTB_TextChanged" />  
            </HorizontalStackLayout>  
  
            <HorizontalStackLayout Spacing="10" >  
                <CheckBox x:Name="TermsDiffDigitsCKB" IsChecked="False"  
                      CheckedChanged="TermsDiffDigitsCKB_CheckedChanged"  
                      HorizontalOptions="Center" VerticalOptions="Center" />  
  
                <Label Text="Use Terms Diff Digits ==>" FontAttributes="Bold"           
                      HorizontalOptions="Start" VerticalOptions="Center" />  
  
                <Entry   x:Name="TermsDiffDigitsTB" HorizontalOptions="FillAndExpand"  
                         BackgroundColor="Cyan"  MinimumWidthRequest="300" FontAttributes="Bold"                   
                         Text="= 2    " TextChanged="TermsDiffDigitsTB_TextChanged" />  
            </HorizontalStackLayout>  
  
            <HorizontalStackLayout Spacing="10" >  
                <Label HorizontalOptions="Start" VerticalOptions="Center"  
                       FontAttributes="Bold"  
                       Text="Use Base Number ==>" />  
  
                <Entry   x:Name="baseXTB"  HorizontalOptions="FillAndExpand" Text="10    "  
                         BackgroundColor="Cyan"  MinimumWidthRequest="300" FontAttributes="Bold"  
                         TextChanged="baseXTB_TextChanged" VerticalOptions="Center" />  
            </HorizontalStackLayout>  
  
            <Editor  x:Name="OutputTB"  
                         IsReadOnly="False" BackgroundColor="LightGreen" FontSize="16"  
                         TextChanged="OutputTB_TextChanged" TextColor="Black"  
                         Placeholder="Solutions go's here" FontAttributes="Bold"  
                         PlaceholderColor="Blue" FontFamily="NCourier"  
                         HorizontalOptions="Fill" VerticalOptions="Start"  
                         HeightRequest="500" WidthRequest="320" >  
<!--  
                <Editor.GestureRecognizers>  
                    <SwipeGestureRecognizer Direction="Left" Swiped="SwipeGestureRecognizer_Swiped"/>  
                    <SwipeGestureRecognizer Direction="Right" Swiped="SwipeGestureRecognizer_Swiped"/>  
                    <SwipeGestureRecognizer Direction="Up" Swiped="SwipeGestureRecognizer_Swiped"/>  
                    <SwipeGestureRecognizer Direction="Down" Swiped="SwipeGestureRecognizer_Swiped"/>  
                    <SwipeGestureRecognizer Threshold="50" />  
                </Editor.GestureRecognizers>  
-->  
  
            </Editor>  
  
            <ProgressBar x:Name="progressBar"  Progress="0" ProgressColor="Blue" />  
  
            <Button  x:Name="RunButton" Text="Start" BackgroundColor="#512BD4"  
                      HorizontalOptions="Center" VerticalOptions="Center"  
                      CornerRadius="20" BorderColor="Black" TextColor="White"  
                      BorderWidth="2" HeightRequest="40" WidthRequest="140"  
                      Clicked="RunButton_Clicked" FontAttributes="Bold" />  
  
        </VerticalStackLayout>  
    </ScrollView>  
  
</ContentPage>  
  
.NET MAUI
.NET MAUI
A Microsoft open-source framework for building native device applications spanning mobile, tablet, and desktop.
2,813 questions
C#
C#
An object-oriented and type-safe programming language that has its roots in the C family of languages and includes support for component-oriented programming.
10,164 questions
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Accepted answer
  1. Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 34,461 Reputation points Microsoft Vendor
    2022-09-05T08:37:10.77+00:00

    Hello,

    I've tested your code on my side, and it worked fine.

    You could try the following steps:

    Step1: Change

    Step1: Please uncomment your GestureRecognizers.

    Step2: On my side, I used DisplayAlert("Test","Swiped","OK") in SwipeGestureRecognizer_Swiped for testing.

    In addition, if you used the following code, you will find case SwipeDirection.Up & Down will never be called.

       switch (e.Direction)  
           {  
               case SwipeDirection.Left:  
                   // Handle the swipe  
                   break;  
               case SwipeDirection.Right:  
                   // Handle the swipe  
                   break;  
               case SwipeDirection.Up:  
                   // Handle the swipe  
                   break;  
               case SwipeDirection.Down:  
                   // Handle the swipe  
                   break;  
           }  
    

    It is caused by the ScrollView, you could change it to VerticalStackLayout.

    You need to use Custom Renderer to deal with up down scrolling.

    You could refer to this thread on StackOverflow: Xamarin.Forms. SwipeGesture and ScrollView don't work together on Android - Stack Overflow.

    In MAUI, we could use the custom renderer by the following way:

       builder   
           .UseMauiCompatibility()  
           .ConfigureMauiHandlers((handlers) => {  
       #if ANDROID  
           handlers.AddHandler(typeof(Shell), typeof(ShellTitle.Platforms.Android.MyRenderer));  
       #endif  
       #if IOS  
           handlers.AddHandler(typeof(Shell), typeof(ShellTitle.Platforms.iOS.MyRenderer));  
       #endif  
           })  
    

    You could refer to Using Custom Renderers in .NET MAUI to get more details.

    Best Regards,

    Alec Liu.


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