source/blender/editors/interface/interface.cc

@@ -2304,7 +2304,7 @@ int ui_but_is_pushed(uiBut *but)
 
 static void ui_but_update_select_flag(uiBut *but, double *value)
 {
-  switch (ui_but_is_pushed_ex(but, value) && (!(but->drawflag & UI_BUT_INDETERMINATE)))
+  switch (ui_but_is_pushed_ex(but, value))
   {
     case true:
       but->flag |= UI_SELECT;
@@ -3786,10 +3786,6 @@ static void ui_but_build_drawstr_int(uiBut *but, int value)
  */
 static void ui_but_update_ex(uiBut *but, const bool validate)
 {
-  if (but->type != UI_BTYPE_LABEL) {
-    but->drawflag |= UI_BUT_INDETERMINATE;
-  }
-
   /* if something changed in the button */
   double value = UI_BUT_VALUE_UNSET;
 
@@ -3798,6 +3794,10 @@ static void ui_but_update_ex(uiBut *but, const bool validate)
 
   ui_but_update_select_flag(but, &value);
 
+  if ((but->drawflag & UI_BUT_INDETERMINATE) && (but->flag & UI_SELECT)) {
+    but->flag &= ~UI_SELECT;
+  }
+
   /* only update soft range while not editing */
   if (!ui_but_is_editing(but)) {
     if ((but->rnaprop != nullptr) || (but->poin && (but->pointype & UI_BUT_POIN_TYPES))) {

source/blender/editors/interface/interface_intern.hh

@@ -1111,6 +1111,7 @@ enum {
   ROUNDBOX_TRIA_MENU,
   ROUNDBOX_TRIA_CHECK,
   ROUNDBOX_TRIA_HOLD_ACTION_ARROW,
+  ROUNDBOX_TRIA_DASH,
 
   ROUNDBOX_TRIA_MAX, /* don't use */
 };

source/blender/editors/interface/interface_widgets.cc

@@ -1031,6 +1031,16 @@ static void shape_preset_trias_from_rect_checkmark(uiWidgetTrias *tria, const rc
   tria->index = g_shape_preset_checkmark_face;
 }
 
+static void shape_preset_trias_from_rect_dash(uiWidgetTrias *tria, const rcti *rect)
+{
+  tria->type = ROUNDBOX_TRIA_DASH;
+
+  /* Center position and size. */
+  tria->center[0] = rect->xmin + 0.5f * BLI_rcti_size_y(rect);
+  tria->center[1] = rect->ymin + 0.5f * BLI_rcti_size_y(rect);
+  tria->size = 0.5f * BLI_rcti_size_y(rect);
+}
+
 /** \} */
 
 /* -------------------------------------------------------------------- */
@@ -4157,44 +4167,22 @@ static void widget_optionbut(uiWidgetColors *wcol,
 
   if (state->but_drawflag & UI_BUT_INDETERMINATE) {
     /* The same muted background color regardless of state. */
-    wcol->inner[0] = wcol->inner_sel[0];
-    wcol->inner[1] = wcol->inner_sel[1];
-    wcol->inner[2] = wcol->inner_sel[2];
-    wcol->inner[3] = 60;
+    color_blend_v4_v4v4(wcol->inner, wcol->inner, wcol->inner_sel, 0.75f);
   }
 
   const float rad = widget_radius_from_rcti(&recttemp, wcol);
   round_box_edges(&wtb, UI_CNR_ALL, &recttemp, rad);
 
   /* decoration */
-  if (state->but_flag & UI_SELECT && !(state->but_drawflag & UI_BUT_INDETERMINATE)) {
+  if (state->but_drawflag & UI_BUT_INDETERMINATE) {
+    shape_preset_trias_from_rect_dash(&wtb.tria1, &recttemp);
+  }
+  else if (state->but_flag & UI_SELECT) {
     shape_preset_trias_from_rect_checkmark(&wtb.tria1, &recttemp);
   }
 
   widgetbase_draw(&wtb, wcol);
 
-  if (state->but_drawflag & UI_BUT_INDETERMINATE) {
-
-    /* Flush the widget cache so we can draw on top. */
-    GPU_blend(GPU_BLEND_ALPHA);
-    UI_widgetbase_draw_cache_flush();
-
-    /* Draw a horizontal line instead of checkmark. */
-    const uint pos = GPU_vertformat_attr_add(
-        immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
-    immUniformColor3ubvAlpha(wcol->text, 192);
-
-    const float extent = (recttemp.ymax - recttemp.ymin);
-    const float w = extent * 0.6f;
-    const float h = MAX2(w / 6.0f, U.pixelsize);
-    const float x = recttemp.xmin + (extent * 0.2f);
-    const float y = recttemp.ymin + (extent * 0.5f) - (h * 0.5f);
-    immRectf(pos, x, y, x + w, y + h);
-    immUnbindProgram();
-    GPU_blend(GPU_BLEND_NONE);
-  }
-
   /* Text space - factor is really just eyeballed. */
   const float offset = delta * 0.9;
   if (text_before_widget) {

source/blender/gpu/shaders/gpu_shader_2D_widget_base_vert.glsl

@@ -137,7 +137,7 @@ vec2 do_tria()
     outRectSize = vec2(0.74, 0.14);
     outRoundCorners = vec4(0.01);
   }
-  else {
+  else if (triaType == 5.0) {
     /* ROUNDBOX_TRIA_HOLD_ACTION_ARROW */
     /* We use a single triangle to cut the round rect in half. The edge will not be Antialiased. */
     pos = tria2 ? vec2(0.0) : arrow_pos[min(vidx, 2)];              /* Only keep 1 triangle. */
@@ -149,6 +149,14 @@ vec2 do_tria()
     outRectSize = vec2(0.75);
     outRoundCorners = vec4(0.01);
   }
+  else if (triaType == 6.0) {
+    /* ROUNDBOX_TRIA_DASH */
+    pos = point_pos[vidx];
+    uvInterp = point_uvs[vidx];
+    uvInterp -= vec2(0.2, 0.45); /* Translate */ 
+    outRectSize = vec2(0.6, 0.1);
+    outRoundCorners = vec4(0.01);
+  }
 
   uvInterp *= abs(size);
   outRectSize *= abs(size);