Fix for long-standing TODO item: Clicking on overlapping nodes would activate buttons below.

This patch adds a new CLIP_EVENTS flag for uiBlock, which will prevent the ui_but_find_mouse_over search function from looking into "lower" uiBlocks (i.e. those further back in the list). The order of block creation for nodes has also been updated to use the z-ordering (just the nodetree->nodes list).

In order for this to work, the bounding box values of the uiBlocks have to be set explicitely to fit the node size, those are usually either zero or calculated from the internal buttons.

1 files changed, 2 insertions, 0 deletions

diff --git a/source/blender/editors/include/UI_interface.h b/source/blender/editors/include/UI_interface.h
index 458fe175fbb..ec6958c8415 100644
--- a/source/blender/editors/include/UI_interface.h
+++ b/source/blender/editors/include/UI_interface.h
@@ -115,6 +115,7 @@ typedef struct uiLayout uiLayout;
 #define UI_BLOCK_OUT_1			1024
 #define UI_BLOCK_NO_FLIP		2048
 #define UI_BLOCK_POPUP_MEMORY	4096
+#define UI_BLOCK_CLIP_EVENTS	8192	/* stop handling mouse events */
 
 /* uiPopupBlockHandle->menuretval */
 #define UI_RETURN_CANCEL	1       /* cancel all menus cascading */
@@ -364,6 +365,7 @@ void uiTextBoundsBlock(uiBlock *block, int addval);
 void uiPopupBoundsBlock(uiBlock *block, int addval, int mx, int my);
 void uiMenuPopupBoundsBlock(uiBlock *block, int addvall, int mx, int my);
 void uiCenteredBoundsBlock(uiBlock *block, int addval);
+void uiExplicitBoundsBlock(uiBlock *block, int minx, int miny, int maxx, int maxy);
 
 int		uiBlocksGetYMin		(struct ListBase *lb);