UI: ignore events in empty region overlap areas

- Resizable areas use 2D view bounds.
- Header uses the button bounds.
- A margin is added to avoid clicking between buttons.
- Region resize edges clamp to the 2D view bounds.

Resovles T61554

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/editors/interface/interface_intern.h b/source/blender/editors/interface/interface_intern.h
index d6f18b4cd87..4af7fdd779f 100644
--- a/source/blender/editors/interface/interface_intern.h
+++ b/source/blender/editors/interface/interface_intern.h
@@ -903,6 +903,7 @@ void ui_but_pie_dir(RadialDirection dir, float vec[2]);
 bool ui_but_is_cursor_warp(const uiBut *but) ATTR_WARN_UNUSED_RESULT;
 
 bool ui_but_contains_pt(const uiBut *but, float mx, float my) ATTR_WARN_UNUSED_RESULT;
+bool ui_but_contains_rect(const uiBut *but, const rctf *rect);
 bool ui_but_contains_point_px_icon(const uiBut *but,
                                    struct ARegion *ar,
                                    const struct wmEvent *event) ATTR_WARN_UNUSED_RESULT;
@@ -918,6 +919,8 @@ uiBut *ui_but_find_mouse_over_ex(struct ARegion *ar,
                                  const bool labeledit) ATTR_WARN_UNUSED_RESULT;
 uiBut *ui_but_find_mouse_over(struct ARegion *ar,
                               const struct wmEvent *event) ATTR_WARN_UNUSED_RESULT;
+uiBut *ui_but_find_rect_over(const struct ARegion *ar,
+                             const rcti *rect_px) ATTR_WARN_UNUSED_RESULT;
 
 uiBut *ui_list_find_mouse_over_ex(struct ARegion *ar, int x, int y) ATTR_WARN_UNUSED_RESULT;
 
@@ -936,6 +939,7 @@ bool ui_block_is_popup_any(const uiBlock *block) ATTR_WARN_UNUSED_RESULT;
 uiBut *ui_region_find_first_but_test_flag(struct ARegion *ar, int flag_include, int flag_exclude);
 uiBut *ui_region_find_active_but(struct ARegion *ar) ATTR_WARN_UNUSED_RESULT;
 bool ui_region_contains_point_px(const struct ARegion *ar, int x, int y) ATTR_WARN_UNUSED_RESULT;
+bool ui_region_contains_rect_px(const struct ARegion *ar, const rcti *rect_px);
 
 /* interface_context_menu.c */
 bool ui_popup_context_menu_for_button(struct bContext *C, uiBut *but);