diff options
Diffstat (limited to 'source/blender/windowmanager/intern/wm_operator_props.c')
| -rw-r--r-- | source/blender/windowmanager/intern/wm_operator_props.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/source/blender/windowmanager/intern/wm_operator_props.c b/source/blender/windowmanager/intern/wm_operator_props.c index 21636153904..72646718e41 100644 --- a/source/blender/windowmanager/intern/wm_operator_props.c +++ b/source/blender/windowmanager/intern/wm_operator_props.c @@ -396,8 +396,38 @@ void WM_operator_properties_select_operation_simple(wmOperatorType *ot) RNA_def_property_flag(prop, PROP_SKIP_SAVE); } +/** + * Selecting and tweaking items are overlapping operations. Getting both to work without conflicts + * requires special care. See + * https://wiki.blender.org/wiki/Human_Interface_Guidelines/Selection#Select-tweaking for the + * desired behavior. + * + * For default click selection (with no modifier keys held), the select operators can do the + * following: + * - On a mouse press on an unselected item, change selection and finish immidiately after. + * This sends an undo push and allows transform to take over should a tweak event be caught now. + * - On a mouse press on a selected item, don't change selection state, but start modal execution + * of the operator. Idea is that we wait with deselecting other items until we know that the + * intention wasn't to tweak (mouse press+drag) all selected items. + * - If a tweak is recognized before the release event happens, cancel the operator, so that + * transform can take over and no undo-push is sent. + * - If the release event occurs rather than a tweak one, deselect all items but the one under the + * cursor, and finish the modal operator. + * + * This utility, together with #WM_generic_select_invoke() and #WM_generic_select_modal() should + * help getting the wanted behavior to work. Most generic logic should be handled in these, so that + * the select operators only have to care for the case dependent handling. + * + * Every select operator has slightly diferent requirements, e.g. VSE strip selection also needs to + * account for handle selection. This should be the baseline behavior though. + */ void WM_operator_properties_generic_select(wmOperatorType *ot) { + /* On the initial mouse press, this is set by #WM_generic_select_modal() to let the select + * operator exec callback know that it should not __yet__ deselect other items when clicking on + * an already selected one. Instead should make sure the operator executes modal then (see + * #WM_generic_select_modal()), so that the exec callback can be called a second time on the + * mouse release event to do this part. */ PropertyRNA *prop = RNA_def_boolean( ot->srna, "wait_to_deselect_others", false, "Wait to Deselect Others", ""); RNA_def_property_flag(prop, PROP_HIDDEN | PROP_SKIP_SAVE); |