[Differential] [Request, 328 lines] D3539: [Notifications] Show interactive thumbnails on notifications

[broulik (Kai Uwe Broulik)]

broulik created this revision.
broulik added reviewers: Plasma, Plasma: Design.
broulik set the repository for this revision to R120 Plasma Workspace.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  When a notification contains URLs, they will be shown as a large preview (in case of one thumbnail) or multiple in a strip (similar to what Klipper does).
  
  The previews can be clicked to open the file and can be dragged anywhere (e.g. to a webbrowser or chat window).

TEST PLAN
  F555195: Screenshot_20161129_173221.png <https://phabricator.kde.org/F555195>
  Spectacle can take advantage of this (the cursor actually changes to the open hand cursor to indicate it's a draggable surface but this cannot be seen in the screenshot)
  F555196: Screenshot_20161129_173311.png <https://phabricator.kde.org/F555196>
  Regular image passed as argument
  F555197: Screenshot_20161129_173410.png <https://phabricator.kde.org/F555197>
  Multiple files that fit in the notification
  F555198: Screenshot_20161129_173431.png <https://phabricator.kde.org/F555198>
  Too many files, overflow
  F555199: Screenshot_20161129_173215.png <https://phabricator.kde.org/F555199>
  Single file without thumbnail - ideally it would then fall back to the small square representation but that is difficult to achieve
  
  Clicking the thumbnails currently doesn't work because the MEL eats the click away. Also, right-click does nothing - would be neat to have the regular KIO file context menu there.
  It also doesn't properly work with grouping, ie. when two notifications are grouped together, the thumbnail shown is the one from the last notification.
  
  Needs https://git.reviewboard.kde.org/r/129586/

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D3539

AFFECTED FILES
  applets/notifications/package/contents/ui/NotificationItem.qml
  applets/notifications/package/contents/ui/NotificationPopup.qml
  applets/notifications/plugin/CMakeLists.txt
  applets/notifications/plugin/notificationshelperplugin.cpp
  applets/notifications/plugin/thumbnailer.cpp
  applets/notifications/plugin/thumbnailer.h
  dataengines/notifications/notificationsengine.cpp

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: broulik, #plasma, #plasma:_design
Cc: plasma-devel, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas
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