Use physical distance for swipe tolerence

[whitman]

Currently, we use pixels for swipe tolerence. We should use physical distance instead.

[minggo]

Can reproduce it with iPhone4 retina simulator. Right?

[whitman]

@minggo Yes

[whitman]

As a note to reproduce, it can be shown by clicking the mouse on page except the first page. When a click is made on the page, it will turn the page back.

[whitman]

Error when running on Galaxy Tab 10.2:

[minggo]

I sent a commit to fix the crash.

[waseem]

This was deployed to staging.

[whitman]

Note: needs to be tested on follow devices

• iPad (non-retina)
• iPad (retina)
• iPhone
• Android phone
• Android tablets (high-res like new Nexus [eaven has] and lower-res like Galaxy Tab 10.2 [chris has])

The following are expected behaviors

• When tapping the screen (i.e., a hotspot), the page should not turn.
• It should not be difficult to trigger a page turn by swiping

@waseem, can you try on your iPad 2? @Eaven can test on his iPhone, him and I can both test on Android phones & tablets.

[waseem]

It works fine on my iPad 2.

[Eaven]

verified

[waseem]

Deployed with 2.1.1

[Eaven]

Verified.