Make it possible to hide/unhide a node during node transform operations.

During drag the H key can be used to toggle the hide flag of the selected nodes.
This makes it easier to 'attach' nodes to available links in narrow places.

3 files changed, 26 insertions, 0 deletions

diff --git a/source/blender/editors/transform/transform.c b/source/blender/editors/transform/transform.c
index 68fe1c42414..59cb050a335 100644
--- a/source/blender/editors/transform/transform.c
+++ b/source/blender/editors/transform/transform.c
@@ -1438,6 +1438,13 @@ int transformEvent(TransInfo *t, const wmEvent *event)
 					handled = true;
 				}
 				break;
+			case HKEY:
+				if (t->spacetype == SPACE_NODE) {
+					t->flag ^= T_TOGGLE_HIDDEN;
+					t->redraw |= TREDRAW_HARD;
+					handled = true;
+				}
+				break;
 			default:
 				break;
 		}
diff --git a/source/blender/editors/transform/transform.h b/source/blender/editors/transform/transform.h
index 1e7052926b3..5df69529b45 100644
--- a/source/blender/editors/transform/transform.h
+++ b/source/blender/editors/transform/transform.h
@@ -424,6 +424,7 @@ typedef struct TransInfo {
 
 	/* alternative transformation. used to add offset to tracking markers */
 #define T_ALT_TRANSFORM		(1 << 24)
+#define T_TOGGLE_HIDDEN		(1 << 25)	/* node editor: toggle state of the hidden flags */
 
 /* TransInfo->modifiers */
 #define	MOD_CONSTRAINT_SELECT	0x01
@@ -472,6 +473,7 @@ typedef struct TransInfo {
 #define TD_MOVEHANDLE2		(1 << 18)
 #define TD_PBONE_LOCAL_MTX_P (1 << 19)	/* exceptional case with pose bone rotating when a parent bone has 'Local Location' option enabled and rotating also transforms it. */
 #define TD_PBONE_LOCAL_MTX_C (1 << 20)	/* same as above but for a child bone */
+#define TD_HIDDEN		(1 << 21)	/* for hide toggling node editor */
 
 /* transsnap->status */
 #define SNAP_FORCED		1
diff --git a/source/blender/editors/transform/transform_conversions.c b/source/blender/editors/transform/transform_conversions.c
index 8c3fa775bca..0eddb68d8a4 100644
--- a/source/blender/editors/transform/transform_conversions.c
+++ b/source/blender/editors/transform/transform_conversions.c
@@ -2375,6 +2375,7 @@ cleanup:
 void flushTransNodes(TransInfo *t)
 {
 	const float dpi_fac = UI_DPI_FAC;
+	bool hidden_state;
 	int a;
 	TransData *td;
 	TransData2D *td2d;
@@ -2393,6 +2394,17 @@ void flushTransNodes(TransInfo *t)
 		node->locx = td2d->loc[0] / dpi_fac;
 		node->locy = td2d->loc[1] / dpi_fac;
 #endif
+		/* update node hidden state with transform data TD_HIDDEN + transformInfo T_TOGGLE_HIDDEN */
+ 		hidden_state = (td->flag & TD_HIDDEN) > 0;
+		if (t->state != TRANS_CANCEL) {
+			hidden_state ^= (t->flag & T_TOGGLE_HIDDEN) > 0;
+		}
+
+		if (hidden_state) {
+			node->flag |= NODE_HIDDEN;
+		} else {
+			node->flag &= ~NODE_HIDDEN;
+		}
 	}
 	
 	/* handle intersection with noodles */
@@ -5987,6 +5999,9 @@ static void NodeToTransData(TransData *td, TransData2D *td2d, bNode *node, const
 	td->ext = NULL; td->val = NULL;
 
 	td->flag |= TD_SELECTED;
+	if(node->flag & NODE_HIDDEN){
+		td->flag |= TD_HIDDEN;
+	}
 	td->dist = 0.0;
 
 	unit_m3(td->mtx);
@@ -6021,6 +6036,8 @@ static void createTransNodeData(bContext *UNUSED(C), TransInfo *t)
 
 	/* nodes dont support PET and probably never will */
 	t->flag &= ~T_PROP_EDIT_ALL;
+	/* initial: do not toggle hidden */
+	t->flag &= ~T_TOGGLE_HIDDEN;
 
 	/* set transform flags on nodes */
 	for (node = snode->edittree->nodes.first; node; node = node->next) {