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| author | rjkroege@chromium.org <rjkroege@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2012-12-08 04:17:50 +0000 |
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| committer | rjkroege@chromium.org <rjkroege@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2012-12-08 04:17:50 +0000 |
| commit | 0a5b7e27fc80da622864c98ee42a722c3160bcfa (patch) | |
| tree | 65dbaef8cc56e2dbe71fbfe023ffd1c085162e28 /sync/api | |
| parent | 3220d1bc79f230a576ef77de5c626796d8a92b89 (diff) | |
| download | chromium_src-0a5b7e27fc80da622864c98ee42a722c3160bcfa.zip chromium_src-0a5b7e27fc80da622864c98ee42a722c3160bcfa.tar.gz chromium_src-0a5b7e27fc80da622864c98ee42a722c3160bcfa.tar.bz2 | |
Use consistent velocity trend to start a touch scroll gesture.
In the GestureRecognizer, we previously inititated scrolling when the finger leaves a L1-norm box surrounding the position of the touch down point. As a result, the page would seem to leap by the size of the L1-norm on the first paint after entering a scrolling gesture.
This CL replaces the L1-norm box mechanism with a new mechanism for determining the start of a scroll: watch for the establishment of a consistent velocity trend across multiple touch moves. This permits determining that a scroll should start with a much smaller displacement than is needed with the L1-norm technique and eliminates the "leap" effect.
BUG=141653
Review URL: https://chromiumcodereview.appspot.com/11469005
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@171934 0039d316-1c4b-4281-b951-d872f2087c98
Diffstat (limited to 'sync/api')
0 files changed, 0 insertions, 0 deletions