a11y: Add XAccessibleValue::getMinimumIncrement method

Add a method 'getMinimumIncrement' to the XAccessibleValue interface.
The method returns the minimal increment by which the value represented by
the object can be adjusted.

The main motivation is to expose this to AT-SPI, so it can be retrieved e.g.
by libatspi's 'atspi_value_get_minimum_increment' function [1],
s. the note in Change-Id: I8af326c2d24c1801147a56ea2e2a886ab42ac634
"a11y: Expose FormattedField as spinbox" for more details.

The implementation relevant for the 'FormattedField' class is in
'SVTXAccessibleNumericField::getMinimumIncrement', which returns
the spin size.

While at it, also move the comment in sw/source/core/access/acccell.hxx
mentioning what methods are overriden for the 'XAccessibleValue' interface
to the right place.

[1] https://developer.gnome.org/libatspi/stable/libatspi-atspi-value.html#atspi-value-get-minimum-increment

Change-Id: Ie148a4e1cedbdbb5964f8565c81611d3480465cb
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/119596
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/accessibility/inc/standard/vclxaccessiblecheckbox.hxx b/accessibility/inc/standard/vclxaccessiblecheckbox.hxx
index 766400bb3e7f..f64f5ab980ea 100644
--- a/accessibility/inc/standard/vclxaccessiblecheckbox.hxx
+++ b/accessibility/inc/standard/vclxaccessiblecheckbox.hxx
@@ -77,6 +77,7 @@ public:
     virtual sal_Bool SAL_CALL setCurrentValue( const css::uno::Any& aNumber ) override;
     virtual css::uno::Any SAL_CALL getMaximumValue(  ) override;
     virtual css::uno::Any SAL_CALL getMinimumValue(  ) override;
+    virtual css::uno::Any SAL_CALL getMinimumIncrement( ) override;
 };