These are implementation details only, and should not be
part of the stable API.
We need the flexibility to change these at any stage without
being bound by any API contract.
And use wherever custom widgets were being created. Reduces
duplicate code and allows specialised handling for raster
band display/selection to be centralized.
This commit implements the improvements described at:
https://lists.osgeo.org/pipermail/qgis-developer/2016-September/044393.html
The QgsRasterMinMaxWidget now offers a seetting to specify that the statistics
should be computed each time the canvas extent changes.
Other changes:
- the content of the QgsRasterMinMaxWidget is now persistant.
- there is no longer any Load button. The global Apply / OK button of the raster
properties dialog has this effect.
- the default "limits" for single band raster is now MinMax and not CumulativeCut
- the default "limits" can be configured for single band, multi band single byte and
multi band multi byte
- "Strech using current extent" honours the "limits" instead of forcing min/max.
QgsNumericSortTreeWidgetItem had a giant TODO saying "make it work".
This makes it work, and adds some other useful features like
being able to specify custom sort value and force items to always
sort on top.
Clean up API. Remove QgsPanelWidgetPage - no longer needed
QgsPanelWidgetStack widget manages back button and breadcrumb.
QgsPanelWidget manages state of active widget.
Rationale:
- there was a lot of large objects passed by value, so potentially
there's a speed bump from this
- even for implicitly shared classes like QString/QList there's still
a (small) cost for copying the objects when there's no reason to
- it's the right thing to do!
- update methods of existing classes
- add comment to methods missing in the sip bindings
- split up collective sip files into single files and use
same directory structure in python/ as in src/
- add a lot of missing classes (some might not make sense because of
missing python methods in those classes)
- remove some non-existing methods from the header files
- add scripts/sipdiff
- replace some usages of std::vector and std::set with QVector/QSet
