A new widget which handles parameter values for child algorithms
within a model. Instead of the previous approach of requiring
individual widget wrappers to handle creation of a suitable
model widget, we do all this automatically for them.
This widget uses a stacked widget with a toolbutton to select
the parameter's source, instead of the previous combo box approach
(which didn't scale well for large models). I.e. users select
first whether the value is taken from a static value, a
model input, or an output from a different child algorithm. The
widget then changes appearance and behavior based on this
choice.
Additionally, a new option is present for all parameters
of using a "precalculated expression". This expression is
evaluated once before the child algorithm is executed
and used during the execution of that algorithm.
- baseName is just passed on to the parent constructor to be the display
name, use a literal string in the example to avoid misunderstanding.
- Remove stray bullet.
The min/max values were stored in the color ramp shader, but to my surprise
these values were never persisted or copied: pseudo-color raster renderer
has a separate storage for the min/max values, so we need that for mesh renderer
as well.
The QgsRasterShaderFunction is not really useful, and QgsColorRamp should not
be derived from it, making things just more confusing.
blocking operation via task manager
Allows use of the task manager progress reporting system from
operations which are blocking (and cannot be made background
tasks!), e.g. layout exporting, project loading.
Because:
- Exactly follows curves and doesn't require segmentizing input geometry
- Also interpolates z/m values if they are present in input geometry
- Is faster
Returns a new curve representing a substring of a curve, from
a start distance and end distance.
If z or m values are present, the output z and m will be interpolated using
the existing vertices' z or m values.
Handles curved geometries without loss.
