This commit addresses 2 issues:
1) Before, a general GestureDetector was registered on the highest level in K9Activity
This resulted in EVERY inherited activity to have a useless, unused gesture detector.
But more than that, in MessageList, a second GestureDetector was assigned to the ListView.
On every fling gesture, both detectors called the onSwipe() methods,
which technically did the following:
- The one directly assigned to the ListView would work corectly by mapping the
(local) event coordinates to the right entry in the ListView
- The global one worked on screen coordinates, so the onSwipe() method would
likely select the wrong ListView entry (system menu bar offset).
- For some reason this "worked" fine, and only the correct entry was selected,
despite two detectors used.
2) The gesture detection for the MessageView caused problems when the message
itself was scrollable, i.e. wide HTML mails. A fling gesture inside the WebView
would scroll the message, but also switch the message.
This commit fixes all those by doing the following:
- Don't register the GestureDetector in K9Activity, instead make the member variable
accessible by subclasses.
- In the subclasses that need a detector register it
- In K9Activity.dispatchTouchEvent() check for mGestureDetector being null
- For MessageList:
* Remove the duplicate gesture detector assigned to the ListView
* in the handleSwipe() methods: calclulate pixel offset of the ListView to make
it work using the global screen coordinates
- For MessageView: Limit sensitive area to the message header, to prevent interference
with the WebView scrolling
- Respect current behavior:
* Force-enable gestures for the MessageList
* Respect user setting in MessageView
- Make sure that after a successful swipe gesture, any pending action is cancelled, to
prevent unwanted things to happen (such as expanding the header after changing
the message, or a context menu popping up in the MessageList).
See http://code.google.com/p/android/issues/detail?id=8497
The ScrollView around the WebView caused all sorts of problems. This
change removes the ScrollView and uses the undocumented method
WebView.setEmbeddedTitleBar() to set the MessageHeader view as "title
bar" of the WebView. This allows MessageHeader to scroll away making
more room for the WebView.
All of the "magic title bar" code was originally implemented by Jesse
for Kaiten.
Because WebView doesn't support a scrolling footer we can no longer
support scrolling buttons or attachments at the end of the message. Now
users can switch from message view to attachment view via a button just
below the message headers.
I also copied some code for which I was too lazy to create a separate
commit. It allows to display attachments we didn't use to show by
clicking on a "More..." button in the attachment view. Those
attachments are mostly images referenced by the HTML part (e.g.
background images).
Fixes issue 3291
Make the mTopView a ToggleScrollView. The only consumer is currently the MessageView, which uses a ToggleScrollView anyway. This should make it easier to reuse the anti-scrolling features in ToggleScrollView for ListView later on.
Remove memory leak from referencing MessageView context from the
Intent that is created to go back to MessageList. MessageView is no
longer hardcoded to go back to MessageList, it instead uses an Intent
given at creation to get back to the originating Activity.
Try our best to restore the MessageList in its previous state when
"Manage BACK button" option is enabled:
Since MessageList lives in its own task, we look for the previous
active task and check whether its top activity matches it. If it does,
we just finish MessageView and Android will automatically restore the
previous task. If it doesn't, we launch the originating Intent (and
MessageList state will be lost).
If option is off, we get the regular Android behavior: got back to the
previous screen, whenever it's the MessageList or another application
if the user long-pressed HOME.
The consequence of this is the need for a new permission in order to
check the previous active task: android.permission.GET_TASKS
Andrew Chen