iOS Question Problem swiping to left when using a webview on AS ViewPager

[Sandman]

I have a somewhat large project that I've mostly been testing in the Simulator. This project uses AS ViewPager, and the different pages in the pager contains webviews.

In the Simulator all works great, there are no problems swiping sideways in any direction. But when I now tried it on a real device I'm having problems swiping from the right to the left. There is a small strip on my screen that isn't covered by the webview, and when I swipe there, I have no problem going from right to left, so I know the pager actually works. For some unknown reason the pager works fine swiping from left to right, without using the small strip.

As best I can tell, there's not even an event generated for xclv_main_ScrollChanged when going from right to left (there is in the other direction). Which to me seems to indicate that the webview is consuming the event. Why it only does it in one direction I couldn't say.

Before I go down the rabbit hole to try to debug and solve this, I just want to check: Is there a known issue on iOS between webviews and AS ViewPager? (And why does it work fine in one direction, and not the other?)

 

[Alexander Stolte]

Before I go down the rabbit hole to try to debug and solve this, I just want to check: Is there a known issue on iOS between webviews and AS ViewPager? (And why does it work fine in one direction, and not the other?)

WebkitWebView in ASViewPager

I have added WebkitWebView to ASViewPager1 using the following code Private p As B4XView = xui.CreatePanel("") p.SetLayoutAnimated(0,0,0, 100%x, 100%y) p.LoadLayout("pg1") WebkitWebView1.JavaScriptEnabled=True WebkitWebView1.Settings.AlgorithmicDarkeningAllowed=True...

www.b4x.com

Alternative to AsVIewPager as B4X view

I am having troubles with ASViewPager when adding a MapFragment on one of its pages. The Map does not respond correctly to the drag and pinch gestures. Seems that some of the events are get by the ASViewPager. I have added panels, turned false scroll and anything makes difference. I would...

www.b4x.com

Thats why i created the AS_ViewPagerNative lib.

[B4X] [XUI] AS ViewPagerNative based on AHViewPager and iTabstrip

The goal was to create a cross-platform viewpager based on existing viewpagers. Since AHViewPager and iTabstrip are very different, the view helps to create a unified interface. I spend a lot of time in creating views, some views i need by my self, but some views not and to create a high...

www.b4x.com

 

[Sandman]

I had this working in another place in my app so before I started the work of incorporating AS ViewPagerNative I took another look to see if I could figure out why it worked in one place and not the other.

The code was identical. Checking the layouts in the Visual Designer, I could see that the properties were identical too. Well, if you ignore the margins. Actually, that was the only thing that differed between them. Long story short, if the left margin is set to zero it works fine. If the left margin is 10, the swipe doesn't work. Insane stuff. I tried some more values to see if I could figure out where the breaking point was, and I was getting some inconsistent results.

But then I saw it. The layout with the webview that worked with swipes did NOT use AutoScaleAll. And the layout where the swipe didn't work DID use AutoScaleAll.

So I reset all margin values to their original values and started doing tests with enabling/disabling AutoScaleAll. I can say with absolute certainty that having AutoScaleAll enabled did stop swipe work from right to left (but not the other direction) when using a webview. Clearly something strange is happening there. (It doesn't apply to my case, but I wonder if the people in the threads you linked to did use AutoScaleAll, and if it would have solved their problems.)

All of this was tested by cleaning the project between each run, it was run as debug on a real iPhone.

I've created a small Bug to log this:

AutoScaleAll seems to disable swipe right->left when using a webview

This post is to log an unexpected behaviour I found regarding swiping right to left, when a layout contains a webview and the layout uses AutoScaleAll. I can't really tell what level the bug is at, or if it even is a bug in B4i, but hopefully this thread will help somebody else in the future...

www.b4x.com

 

[Alexander Stolte]

AutoScaleAll

The AS_ViewPager is based on the xCustomListView and you shouldn't use AutoScale there either, so you shouldn't use it with the ViewPager either.

 

[Sandman]

I suppose I missed that in the documentation.

 

[Alexander Stolte]

It's not written anywhere, you have to know it. As there are already several threads on this. I have added it to the ViewPager thread.