From 803140774eda264fbf7c872cd480558b4caa1275 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Mon, 5 Oct 2015 01:24:15 +0000
Subject: Highlight connected edges on port hover

git-svn-id: http://svn.drobilla.net/lad/trunk/ganv@5745 a436a847-0d15-0410-975c-d299462d15a1
---
 NEWS           |  3 ++-
 ganv/edge.h    |  6 ++++++
 src/Canvas.cpp | 23 ++++++++++++++++++-----
 src/edge.c     | 12 ++++++++++++
 4 files changed, 38 insertions(+), 6 deletions(-)

diff --git a/NEWS b/NEWS
index 246b75c..ef05d94 100644
--- a/NEWS
+++ b/NEWS
@@ -5,6 +5,7 @@ ganv (1.4.3) unstable;
   * Preserve selection for quickly making several connections.
   * Dampen sprung layout energy over time to prevent oscillation.
   * Distinguish edge color from port color slighly.
+  * Highlight connected edges on port hover.
   * Add support for PDF and PS export.
   * Improve text rendering at high zoom.
   * Improve appearance of graphs with circle nodes.
@@ -17,7 +18,7 @@ ganv (1.4.3) unstable;
   * Fix crash when destroying canvas.
   * Upgrade to waf 1.8.14
 
- -- David Robillard <d@drobilla.net>  Fri, 02 Oct 2015 21:08:24 -0400
+ -- David Robillard <d@drobilla.net>  Sun, 04 Oct 2015 21:23:59 -0400
 
 ganv (1.4.2) stable;
 
diff --git a/ganv/edge.h b/ganv/edge.h
index 46816f6..72b4105 100644
--- a/ganv/edge.h
+++ b/ganv/edge.h
@@ -77,6 +77,12 @@ ganv_edge_select(GanvEdge* edge);
 void
 ganv_edge_unselect(GanvEdge* edge);
 
+void
+ganv_edge_highlight(GanvEdge* edge);
+
+void
+ganv_edge_unhighlight(GanvEdge* edge);
+
 /**
  * ganv_edge_disconnect:
  *
diff --git a/src/Canvas.cpp b/src/Canvas.cpp
index a30657b..3c59351 100644
--- a/src/Canvas.cpp
+++ b/src/Canvas.cpp
@@ -333,6 +333,7 @@ struct GanvCanvasImpl {
 
 	void ports_joined(GanvPort* port1, GanvPort* port2);
 	void port_clicked(GdkEvent* event, GanvPort* port);
+	void highlight_port(GanvPort* port, bool highlight);
 
 	void move_contents_to_internal(double x, double y, double min_x, double min_y);
 
@@ -1418,7 +1419,7 @@ void
 GanvCanvasImpl::end_connect_drag()
 {
 	if (_connect_port) {
-		g_object_set(G_OBJECT(_connect_port), "highlighted", FALSE, NULL);
+		highlight_port(_connect_port, false);
 	}
 	gtk_object_destroy(GTK_OBJECT(_drag_edge));
 	gtk_object_destroy(GTK_OBJECT(_drag_node));
@@ -1557,7 +1558,7 @@ GanvCanvasImpl::port_event(GdkEvent* event, GanvPort* port)
 		gboolean selected;
 		g_object_get(G_OBJECT(port), "selected", &selected, NULL);
 		if (!control_dragging && !selected) {
-			g_object_set(G_OBJECT(port), "highlighted", TRUE, NULL);
+			highlight_port(port, true);
 			return true;
 		}
 		break;
@@ -1574,7 +1575,7 @@ GanvCanvasImpl::port_event(GdkEvent* event, GanvPort* port)
 				NULL, event->crossing.time);
 			return true;
 		} else if (!control_dragging) {
-			g_object_set(G_OBJECT(port), "highlighted", FALSE, NULL);
+			highlight_port(port, false);
 			return true;
 		}
 		break;
@@ -1594,8 +1595,8 @@ GanvCanvasImpl::ports_joined(GanvPort* port1, GanvPort* port2)
 		return;
 	}
 
-	g_object_set(G_OBJECT(port1), "highlighted", FALSE, NULL);
-	g_object_set(G_OBJECT(port2), "highlighted", FALSE, NULL);
+	highlight_port(port1, false);
+	highlight_port(port2, false);
 
 	GanvNode* src_node;
 	GanvNode* dst_node;
@@ -1631,6 +1632,18 @@ GanvCanvasImpl::port_clicked(GdkEvent* event, GanvPort* port)
 	}
 }
 
+void
+GanvCanvasImpl::highlight_port(GanvPort* port, bool highlight)
+{
+	g_object_set(G_OBJECT(port), "highlighted", highlight, NULL);
+	ganv_canvas_for_each_edge_on(_gcanvas,
+	                             GANV_NODE(port),
+	                             (highlight
+	                              ? (GanvEdgeFunc)ganv_edge_highlight
+	                              : (GanvEdgeFunc)ganv_edge_unhighlight),
+	                             NULL);
+}
+
 /* Update animated "rubber band" selection effect. */
 gboolean
 GanvCanvasImpl::on_animate_timeout(gpointer data)
diff --git a/src/edge.c b/src/edge.c
index 89da897..d3c96cc 100644
--- a/src/edge.c
+++ b/src/edge.c
@@ -688,6 +688,18 @@ ganv_edge_unselect(GanvEdge* edge)
 	ganv_edge_set_selected(edge, FALSE);
 }
 
+void
+ganv_edge_highlight(GanvEdge* edge)
+{
+	ganv_edge_set_highlighted(edge, TRUE);
+}
+
+void
+ganv_edge_unhighlight(GanvEdge* edge)
+{
+	ganv_edge_set_highlighted(edge, FALSE);
+}
+
 void
 ganv_edge_set_highlighted(GanvEdge* edge, gboolean highlighted)
 {
-- 
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