Review Request 123833: Add basic modifier key support to selection tools.

[Michael Abrahams]

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https://git.reviewboard.kde.org/r/123833/
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(Updated May 17, 2015, 8:56 p.m.)


Review request for Calligra.


Repository: calligra


Description (updated)
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This refactors polygonal, elliptical, and rectangular selection tools to use a basic selection tool template which unifies previously duplicated code. The template overrides the ability to execute alternate actions, but none of those tools supported alternate actions previously and the ellipse and rectangle were already overriding the modifier keys to begin with. 

Shift: add to selection
Alt: subtract from selection
Shift+Alt: intersect current selection
Ctrl: replace selection

Certain key combinations allow users the ability to expose the modifier keys to the base tool, i.e. to make proportional / translated / scaled alterations using ctrl/alt/shift.
1) If the user *clicks first and then presses modifier keys*, those modifier keys will only alter the selection method.
2) If the user *presses modifier keys first and then clicks*, the selection method is locked in, and subsequent modifier keystrokes will change how the selection is drawn.
3) If the underlying tool *never takes modifier keys*, modifier keys will always alter the selection method. 

These rules can be defined systematically by modifying the template.

Things to do later: 
+ Basic functionality is implemented in KisToolSelectBase, which covers the outline, contiguous, similar color and path selection tools which inherit from KisToolSelectBase.  A more complete refactoring might define KisToolSelectBase via the selection tool template, but it is not simple for the path selection tool which uses a more complicated delegated design pattern.
+ The tools need new icons (e.g. little plus/minus symbols) to give users visual feedback when they activate the modifiers.
+ The Ctrl key should switch temporarily to the move tool, as in Photoshop.
+ Check idiomatic naming conventions, style, etc.


Diffs
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  CMakeFiles/2.8.12.1/CMakeDetermineCompilerABI_CXX.bin PRE-CREATION 
  krita/image/kis_selection.h 6376f874 
  krita/plugins/tools/selectiontools/kis_tool_select_elliptical.h 7b2cd2f 
  krita/plugins/tools/selectiontools/kis_tool_select_elliptical.cc 999f1a0 
  krita/plugins/tools/selectiontools/kis_tool_select_path.cc 9f1a65c 
  krita/plugins/tools/selectiontools/kis_tool_select_polygonal.h feee9cb 
  krita/plugins/tools/selectiontools/kis_tool_select_polygonal.cc 9acca50 
  krita/plugins/tools/selectiontools/kis_tool_select_rectangular.h 5e88766 
  krita/plugins/tools/selectiontools/kis_tool_select_rectangular.cc 331c6a4 
  krita/ui/input/kis_alternate_invocation_action.h b47c59e 
  krita/ui/input/kis_alternate_invocation_action.cpp 48723bf 
  krita/ui/tool/kis_selection_action_template.h PRE-CREATION 
  krita/ui/tool/kis_tool_paint.h 48c1f35 
  krita/ui/tool/kis_tool_polyline_base.h f681fd8 
  krita/ui/tool/kis_tool_polyline_base.cpp 6071f76 
  krita/ui/tool/kis_tool_rectangle_base.h a0b470c 
  krita/ui/tool/kis_tool_rectangle_base.cpp 8e091d0 
  krita/ui/tool/kis_tool_select_base.h 500d6dd 
  krita/ui/tool/kis_tool_select_base.cpp 40779ad 

Diff: https://git.reviewboard.kde.org/r/123833/diff/


Testing (updated)
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There are no tests targeting the individual selection tools, but the tests for other individual tools passed.

The ability to add, subtract and intersect complicated shapes quickly exposes some bugs in how the selection marquees are drawn: sometimes extra lines are drawn, sometimes lines fail to be drawn.


Thanks,

Michael Abrahams

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