Bug 45351 - TapGestureRecognizer blocks underlying PanGestureRecognizer
Summary: TapGestureRecognizer blocks underlying PanGestureRecognizer
Alias: None
Product: Forms
Classification: Xamarin
Component: Android ()
Version: 2.3.1
Hardware: PC Windows
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2016-10-13 10:40 UTC by Dominik Rupp
Modified: 2017-06-22 01:57 UTC (History)
3 users (show)

Tags: Android ac
Is this bug a regression?: ---
Last known good build:

Repro project (282.42 KB, application/x-zip-compressed)
2016-10-24 15:50 UTC, E.Z. Hart [MSFT]
Pan and Tap defined on a frame (333.77 KB, application/x-zip-compressed)
2017-04-03 19:12 UTC, Brian Erickson

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Description Dominik Rupp 2016-10-13 10:40:14 UTC
Consider the following Layout that works in iOS and UWP:

<StackLayout VerticalOptions="Center" HorizontalOptions="Center">

      <PanGestureRecognizer PanUpdated="PanGestureRecognizer_OnPanUpdated" />

    <Label Text="Test" x:Name="Label">
        <TapGestureRecognizer Command="{Binding TestCommand}" />


The Label is bound to a Command that only executes a Debug.WriteLine("Tapped").

While in iOS and UWP I can tap the label AND pan the underlying StackLayout, in Android the tap seems to absorb the event so it is not forwarded to the underlying container.
Comment 1 E.Z. Hart [MSFT] 2016-10-24 15:50:00 UTC
Created attachment 18193 [details]
Repro project
Comment 2 Brian Erickson 2017-04-03 19:11:52 UTC
Also consider the following case:
   <Frame x:Name="outerFrame" Padding="10, 50, 10, 0" OutlineColor="Red">
         <TapGestureRecognizer Tapped="onTap" />
         <PanGestureRecognizer PanUpdated="OnPanUpdated" />

      <StackLayout Margin="50,50,0,0" Spacing="20">
         <Label x:Name="myTapLabel"  Text="Tap Count: 0"></Label>
         <Label x:Name="myPanLabel"  Text="Pan Complete Count: 0"></Label>

On UWP tap works normally buy it's difficult(impossible) to get the pan gesture to complete.  Also can only tap on the labels.

On Android the tap works normally.  Pan fires both pan and tap.  I can pan or tap anywhere on the screen.

Another repro project attached...
Comment 3 Brian Erickson 2017-04-03 19:12:32 UTC
Created attachment 21160 [details]
Pan and Tap defined on a frame