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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CB-6231) Better approach for preventing rubberband in Windows Phone 8
Date Mon, 29 Sep 2014 23:32:35 GMT

    [ https://issues.apache.org/jira/browse/CB-6231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14152509#comment-14152509
] 

ASF GitHub Bot commented on CB-6231:
------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/cordova-wp8/pull/60


> Better approach for preventing rubberband in Windows Phone 8
> ------------------------------------------------------------
>
>                 Key: CB-6231
>                 URL: https://issues.apache.org/jira/browse/CB-6231
>             Project: Apache Cordova
>          Issue Type: Improvement
>          Components: WP8
>    Affects Versions: 3.4.0
>            Reporter: Dan Polivy
>            Assignee: Jesse MacFadyen
>            Priority: Minor
>              Labels: scrolling
>
> I've been looking for a good solution for the "DisallowOverscroll" setting that works
on Windows Phone 8; I've tried the {{this.CordovaView.DisableBouncyScrolling}} setting, but
it has the side effect of making "intended" scrolling feel really sluggish, because it only
responds to swipes and doesn't track real-time under one's finger.
> Using [this approach|http://stackoverflow.com/questions/21652548/bouncing-when-overflow-set-to-auto-or-scroll-in-wp8-webbrowser-control],
I came up with an alternate implementation that works in the same scenarios as {{DisableBouncyScrolling}},
but feels a lot nicer. Note that with _both_ implementations, if inertia causes the scrolling
to hit the top or bottom, you still get a small bounce -- I don't think there's any way to
avoid that on WP8 at the moment.
> I thought I'd share it here, in case you'd like to add it as another option in the WP8
Cordova implementation. I'm happy to attempt a pull request if you'd like (just not sure the
best place for the JS code to live if it's part of the 'system').
> {code:title=BrowserMouseHelper.cs|borderStyle=solid}
>             // This goes in the Border_ManipulationDelta event handler
>             var preventScroll = _browser.InvokeScript("eval", new string[] { "(function(delta)
{ return isScrollingPrevented(delta); })(" + e.DeltaManipulation.Translation.Y.ToString()
+ ")" }) as string;
>             if (preventScroll == "true")
>             {
>                 e.Handled = true;
>             }
> {code}
> {code:title=.js file|borderStyle=solid}
> // This goes in a JS file that's part of the app; I'm using jQuery, but it can be written
without that dependency
> isScrollingPrevented = function(delta) {
> 	var scrollTop = $(document).scrollTop(),
> 		top = scrollTop === 0,
> 		bottom = scrollTop + $(window).height() === $(document).height();
> 	return ((top && delta > 0) || (bottom && delta < 0)).toString();
> };
> {code}



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