So, after a quick IRC chat with timp, let me recap what happens in the gallery:
1) When the layout is switched to 1 column, Gallery sets header.flickable=templateFlickable so that the header hides and shows based on user interaction with the page 2) If the user scrolls down, that hides the header (exposed = false) 3) When the layout is switched to 2 columns, Gallery sets header.flickable=null so that the header is locked when in 2 panels mode, BUT if the user has not touched the surface after 2) then the header will still have expose=false (i.e it's scrolled out of the view). Since flickable is now null, the header will not show based on user interaction, thus causing the bug. So, we have 2 solutions here, as timp pointed out on IRC: 1) App developer sets exposed=true when he also sets flickable= null OR 2) Header components automatically sets exposed=true when its "flickable" property is set to null, to prevent cases like the one described by this bug from happening The latter is a behaviour change, and it is definitely useful and likely the most common usecase, but maybe there are usecases where the developer may want to have more control over what happens to the Header after the hide-and-show-based-on-interaction mechanism is disabled (by setting flickable=null) -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to ubuntu-ui-toolkit in Ubuntu. https://bugs.launchpad.net/bugs/1556860 Title: Blank left panel header in gallery after resizing AdaptivePageLayout from two panels to one and back Status in ubuntu-ui-toolkit package in Ubuntu: In Progress Bug description: UITK r1888 Environment: Windowed mode, Vivid+OverlayPPA Steps to reproduce: 1) Launch UI Toolkit Gallery 2) Scroll left panel until the header animates out of screen 3) Resize window so that only the left panel is shown 4) Resize window until it shows both left and right panels Expected Outcome: The Header comes back into view Actual Outcome: Header doesn't show, and its place is taken by a blank box. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-ui-toolkit/+bug/1556860/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
