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UI: Accessibility: Reduce Motion

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Add "Reduce Motion" option to a new `Accessibility` panel under
Preferences, User Interface.

"Reduce Motion" avoids non-essential animation effects, especially
useful for those experiencing motion sickness/vertigo.

It affects:
* Region open/close.
* Pie menus animation.
* Smooth views.

This panel in the future could host common accessibility settings such
as "Increase Contrast" or font size and weight controls that currently
are part of themes.

See PR for details and screenshots.

Co-authored-by: Harley Acheson <harley.acheson@gmail.com>
Pull Request: https://projects.blender.org/blender/blender/pulls/140873
This commit is contained in:
Pablo Vazquez
2025-09-05 21:12:52 +02:00
parent 1b49b94e0d
commit eae4585177
8 changed files with 29 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
scripts/startup/bl_ui/space_userpref.py
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@@ -270,6 +270,19 @@ class USERPREF_PT_interface_translation(InterfacePanel, CenterAlignMixIn, Panel)
col.prop(view, "use_translate_new_dataname", text="New Data")
class USERPREF_PT_interface_accessibility(InterfacePanel, CenterAlignMixIn, Panel):
bl_label = "Accessibility"
bl_options = {'DEFAULT_CLOSED'}
def draw_centered(self, context, layout):
prefs = context.preferences
view = prefs.view
flow = layout.grid_flow(row_major=False, columns=0, even_columns=True, even_rows=False, align=False)
flow.prop(view, "use_reduce_motion")
class USERPREF_PT_interface_editors(InterfacePanel, CenterAlignMixIn, Panel):
bl_label = "Editors"
@@ -2954,6 +2967,7 @@ classes = (
USERPREF_PT_interface_temporary_windows,
USERPREF_PT_interface_statusbar,
USERPREF_PT_interface_translation,
USERPREF_PT_interface_accessibility,
USERPREF_PT_interface_text,
USERPREF_PT_interface_menus,
USERPREF_PT_interface_menus_mouse_over,

2
source/blender/blenloader/intern/versioning_userdef.cc
View File

@@ -1146,7 +1146,7 @@ void blo_do_versions_userdef(UserDef *userdef)
}
if (!USER_VERSION_ATLEAST(280, 44)) {
userdef->uiflag &= ~(USER_NO_MULTITOUCH_GESTURES | USER_UIFLAG_UNUSED_1);
userdef->uiflag &= ~USER_NO_MULTITOUCH_GESTURES;
userdef->uiflag2 &= ~USER_UIFLAG2_UNUSED_0;
userdef->gp_settings &= ~GP_PAINT_UNUSED_0;
}

4
source/blender/editors/interface/interface_handlers.cc
View File

@@ -11558,7 +11558,9 @@ static int ui_pie_handler(bContext *C, const wmEvent *event, uiPopupBlockHandle
/* handle animation */
if (!(block->pie_data.flags & UI_PIE_ANIMATION_FINISHED)) {
const double final_time = 0.01 * U.pie_animation_timeout;
const double final_time = (U.uiflag & USER_REDUCE_MOTION) ?
0.0f :
0.01 * U.pie_animation_timeout;
float fac = duration / final_time;
const float pie_radius = U.pie_menu_radius * UI_SCALE_FAC;

2
source/blender/editors/screen/area.cc
View File

@@ -2360,7 +2360,7 @@ void region_toggle_hidden(bContext *C, ARegion *region, const bool do_fade)
region->flag ^= RGN_FLAG_HIDDEN;
if (do_fade && region->overlap) {
if (do_fade && region->overlap && !(U.uiflag & USER_REDUCE_MOTION)) {
/* starts a timer, and in end calls the stuff below itself (region_sblend_invoke()) */
ED_region_visibility_change_update_animated(C, area, region);
}

2
source/blender/makesdna/DNA_userdef_types.h
View File

@@ -763,7 +763,7 @@ typedef enum eWalkNavigation_Flag {
/** #UserDef.uiflag */
typedef enum eUserpref_UI_Flag {
USER_NO_MULTITOUCH_GESTURES = (1 << 0),
USER_UIFLAG_UNUSED_1 = (1 << 1), /* cleared */
USER_REDUCE_MOTION = (1 << 1),
USER_WHEELZOOMDIR = (1 << 2),
USER_FILTERFILEEXTS = (1 << 3),
USER_DRAWVIEWINFO = (1 << 4),

2
source/blender/makesrna/intern/rna_space.cc
View File

@@ -769,7 +769,7 @@ static void rna_Space_bool_from_region_flag_update_by_type(bContext *C,
if (region) {
if (region_flag == RGN_FLAG_HIDDEN) {
/* Only support animation when the area is in the current context. */
if (region->overlap && (area == CTX_wm_area(C))) {
if (region->overlap && (area == CTX_wm_area(C)) && !(U.uiflag & USER_REDUCE_MOTION)) {
ED_region_visibility_change_update_animated(C, area, region);
}
else {

7
source/blender/makesrna/intern/rna_userdef.cc
View File

@@ -5375,6 +5375,13 @@ static void rna_def_userdef_view(BlenderRNA *brna)
prop, nullptr, "statusbar_flag", STATUSBAR_SHOW_EXTENSIONS_UPDATES);
RNA_def_property_ui_text(prop, "Extensions Updates", "Show Extensions Update Count");
RNA_def_property_update(prop, NC_SPACE | ND_SPACE_INFO, "rna_userdef_update");
/* Accessibility. */
prop = RNA_def_property(srna, "use_reduce_motion", PROP_BOOLEAN, PROP_NONE);
RNA_def_property_boolean_sdna(prop, nullptr, "uiflag", USER_REDUCE_MOTION);
RNA_def_property_ui_text(
prop, "Reduce Motion", "Avoid animations and other motion effects in the interface");
RNA_def_property_update(prop, 0, "rna_userdef_update");
}
static void rna_def_userdef_edit(BlenderRNA *brna)

2
source/blender/windowmanager/intern/wm_operators.cc
View File

@@ -1080,7 +1080,7 @@ void WM_operator_view3d_unit_defaults(bContext *C, wmOperator *op)
int WM_operator_smooth_viewtx_get(const wmOperator *op)
{
return (op->flag & OP_IS_INVOKE) ? U.smooth_viewtx : 0;
return (op->flag & OP_IS_INVOKE && !(U.uiflag & USER_REDUCE_MOTION)) ? U.smooth_viewtx : 0;
}
wmOperatorStatus WM_menu_invoke_ex(bContext *C,