[grits] Add cursor support to GritsObject

[Andy Spencer <andys src gnome org>]

commit e8af1dabca07d2b7a26369d845a81efeae3e08a0
Author: Andy Spencer <andy753421 gmail com>
Date:   Sun Apr 29 03:40:20 2012 +0000

    Add cursor support to GritsObject

 src/grits-opengl.c         |   19 ++++++++++++++++---
 src/grits-viewer.c         |    9 ---------
 src/objects/grits-object.c |    6 ++++++
 src/objects/grits-object.h |   10 ++++++++++
 4 files changed, 32 insertions(+), 12 deletions(-)
---
diff --git a/src/grits-opengl.c b/src/grits-opengl.c
index 172b606..a02e868 100644
--- a/src/grits-opengl.c
+++ b/src/grits-opengl.c
@@ -200,7 +200,8 @@ static gboolean on_configure(GritsOpenGL *opengl, GdkEventConfigure *event, gpoi
 	return FALSE;
 }
 
-static gint run_picking(GritsOpenGL *opengl, GdkEvent *event, GPtrArray *objects)
+static gint run_picking(GritsOpenGL *opengl, GdkEvent *event,
+		GPtrArray *objects, GritsObject **top)
 {
 	/* Setup picking buffers */
 	guint buffer[100][4] = {};
@@ -230,6 +231,7 @@ static gint run_picking(GritsOpenGL *opengl, GdkEvent *event, GPtrArray *objects
 		guint        index  = buffer[i][3];
 		GritsObject *object = objects->pdata[index];
 		object->state.picked = TRUE;
+		*top = object;
 	}
 
 	/* Notify objects of pointer movements */
@@ -263,6 +265,7 @@ static gboolean on_motion_notify(GritsOpenGL *opengl, GdkEventMotion *event, gpo
 
 	g_mutex_lock(opengl->objects_lock);
 
+	GritsObject *top = NULL;
 	GPtrArray *ortho = _objects_to_array(opengl, TRUE);
 	GPtrArray *world = _objects_to_array(opengl, FALSE);
 
@@ -270,14 +273,24 @@ static gboolean on_motion_notify(GritsOpenGL *opengl, GdkEventMotion *event, gpo
 	glMatrixMode(GL_PROJECTION); glLoadIdentity();
 	gluPickMatrix(gl_x, gl_y, delta, delta, viewport);
 	glMultMatrixd(projection);
-	gint world_hits = run_picking(opengl, (GdkEvent*)event, world);
+	gint world_hits = run_picking(opengl, (GdkEvent*)event, world, &top);
 
 	/* Run ortho picking */
 	glMatrixMode(GL_PROJECTION); glLoadIdentity();
 	gluPickMatrix(gl_x, gl_y, delta, delta, viewport);
 	glMatrixMode(GL_MODELVIEW);  glLoadIdentity();
 	glOrtho(0, viewport[2], viewport[3], 0, 1000, -1000);
-	gint ortho_hits = run_picking(opengl, (GdkEvent*)event, ortho);
+	gint ortho_hits = run_picking(opengl, (GdkEvent*)event, ortho, &top);
+
+	/* Update cursor */
+	static GdkCursor *cursor = NULL;
+	static GdkWindow *window = NULL;
+	if (!window || !cursor) {
+		cursor = gdk_cursor_new(GDK_FLEUR);
+		window = gtk_widget_get_window(GTK_WIDGET(opengl));
+	}
+	GdkCursor *topcursor = top && top->cursor ? top->cursor : cursor;
+	gdk_window_set_cursor(window, topcursor);
 
 	g_debug("GritsOpenGL: on_motion_notify - hits=%d/%d,%d/%d ev=%.0lf,%.0lf",
 			world_hits, world->len, ortho_hits, ortho->len, gl_x, gl_y);
diff --git a/src/grits-viewer.c b/src/grits-viewer.c
index f7d70e9..92f6e86 100644
--- a/src/grits-viewer.c
+++ b/src/grits-viewer.c
@@ -180,13 +180,6 @@ static void on_view_changed(GritsViewer *viewer,
 	gtk_widget_queue_draw(GTK_WIDGET(viewer));
 }
 
-static void on_realize(GritsViewer *viewer)
-{
-	GdkCursor *cursor = gdk_cursor_new(GDK_FLEUR);
-	GdkWindow *window = gtk_widget_get_window(GTK_WIDGET(viewer));
-	gdk_window_set_cursor(window, cursor);
-}
-
 /***********
  * Methods *
  ***********/
@@ -608,8 +601,6 @@ static void grits_viewer_init(GritsViewer *viewer)
 
 	g_signal_connect(viewer, "location-changed",     G_CALLBACK(on_view_changed),   NULL);
 	g_signal_connect(viewer, "rotation-changed",     G_CALLBACK(on_view_changed),   NULL);
-
-	g_signal_connect(viewer, "realize",              G_CALLBACK(on_realize),        NULL);
 }
 static void grits_viewer_finalize(GObject *gobject)
 {
diff --git a/src/objects/grits-object.c b/src/objects/grits-object.c
index e9a7a0a..a1e80ec 100644
--- a/src/objects/grits-object.c
+++ b/src/objects/grits-object.c
@@ -166,6 +166,12 @@ void grits_object_queue_draw(GritsObject *object)
 		gtk_widget_queue_draw(GTK_WIDGET(object->viewer));
 }
 
+void grits_object_set_cursor(GritsObject *object, GdkCursorType cursor)
+{
+	// Used by grits OpenGL
+	object->cursor = gdk_cursor_new(cursor);
+}
+
 /* Event handling */
 void grits_object_pick(GritsObject *object, GritsOpenGL *opengl)
 {
diff --git a/src/objects/grits-object.h b/src/objects/grits-object.h
index 0b8cacb..9969278 100644
--- a/src/objects/grits-object.h
+++ b/src/objects/grits-object.h
@@ -57,6 +57,7 @@ struct _GritsObject {
 	guint32      skip;   // Bit mask of safe operations
 
 	GritsState   state;  // Internal, used for picking
+	GdkCursor   *cursor; // Internal, cached cursor
 };
 
 struct _GritsObjectClass {
@@ -89,6 +90,15 @@ gboolean grits_object_event(GritsObject *object, GdkEvent *event);
 void grits_object_queue_draw(GritsObject *object);
 
 /**
+ * grits_object_set_cursor:
+ * @object: The #GritsObject to set the cursor for
+ * @cursor: The cursor to use when the object is hovered over
+ *
+ * Causes the cursor to use a particular icon when located over a given object
+ */
+void grits_object_set_cursor(GritsObject *object, GdkCursorType cursor);
+
+/**
  * grits_object_center:
  * @object: The #GritsObject to get the center of
  *