Review Request 120505: Adding a activation-toggle and preview to assistants.

[Wolthera van Hövell]

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https://git.reviewboard.kde.org/r/120505/
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Review request for Calligra, Dmitry Kazakov and Boudewijn Rempt.


Repository: calligra


Description
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This patch adds a little eye icon underneath the deletion icon which can be used to activate/deactivate snapping and in the case of the perspective assistant, add a preview for where the snapping will happen/head to.

This last bit of code may be refactored a little more, if I want to allow to option to see this preview without having the basic assistant visible. This would allow these previews to make sense on normal assistants as well.
(Right now, the 'hide assistants' button in view just makes the whole widget invisible).
Preview will be important if we're gonna have parallel rulers and the like.

I also fixed a minor bug where the canvas wasn't passed to the drawAssistant function in the painting assistant by the PaintingAssistantDecorations class, because whoever wrote the caching system had added a boolean for it in the arguments in a rather random place. Both caching and me accessing the canvas for cursor conversion work now.


Diffs
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  krita/plugins/assistants/RulerAssistant/EllipseAssistant.cc ec6ee06 
  krita/plugins/assistants/RulerAssistant/PerspectiveAssistant.h c4fd3b2 
  krita/plugins/assistants/RulerAssistant/PerspectiveAssistant.cc e3ec525 
  krita/plugins/assistants/RulerAssistant/RulerAssistant.cc dd173c0 
  krita/plugins/assistants/RulerAssistant/SplineAssistant.cc 8391f65 
  krita/plugins/assistants/RulerAssistant/kis_ruler_assistant_tool.h 11e92f3 
  krita/plugins/assistants/RulerAssistant/kis_ruler_assistant_tool.cc bbfe5cd 
  krita/ui/canvas/kis_canvas_decoration.cc 9179d3f 
  krita/ui/canvas/kis_canvas_widget_base.cpp 02f0ab5 
  krita/ui/kis_painting_assistant.h 6f315e8 
  krita/ui/kis_painting_assistant.cc 81c6069 
  krita/ui/kis_painting_assistants_decoration.cpp dd65ec0 

Diff: https://git.reviewboard.kde.org/r/120505/diff/


Testing
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Lots, I can't find any crashes or bugs here.


Thanks,

Wolthera van Hövell

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