Dan Polivy created CB-6231:
------------------------------
Summary: 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
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 allowScroll = _browser.InvokeScript("eval", new string[] {
"(function(delta) { return isScrollingAllowed(delta); })(" +
e.DeltaManipulation.Translation.Y.ToString() + ")" }) as string;
if (allowScroll == "false")
{
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
isScrollingAllowed = 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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