From 7ef044ec2e605670f694e32f3658751b5b8caab2 Mon Sep 17 00:00:00 2001
From: Jim Evins <evins@snaught.com>
Date: Wed, 9 Oct 2002 01:59:14 +0000
Subject: [PATCH] Added "pointer_exit" signal. Added gl_view_is_zoom_min () and
 gl_view_is_zoom_max () functions.

git-svn-id: https://glabels.svn.sourceforge.net/svnroot/glabels/trunk@152 f5e0f49d-192f-0410-a22d-a8d8700d0965
---
 glabels2/src/view.c | 57 ++++++++++++++++++++++++++++++++++++++-------
 glabels2/src/view.h |  5 ++++
 2 files changed, 54 insertions(+), 8 deletions(-)

diff --git a/glabels2/src/view.c b/glabels2/src/view.c
index ee571cdd..ea52ad48 100644
--- a/glabels2/src/view.c
+++ b/glabels2/src/view.c
@@ -58,6 +58,7 @@ enum {
 	SELECTION_CHANGED,
 	ZOOM_CHANGED,
 	POINTER_MOVED,
+	POINTER_EXIT,
 	MODE_CHANGED,
 	LAST_SIGNAL
 };
@@ -74,14 +75,13 @@ static guint signals[LAST_SIGNAL] = {0};
 /* "CLIPBOARD" selection */
 static GdkAtom clipboard_atom = GDK_NONE;
 
-#define HOME_SCALE 2.0
 static gdouble scales[] = {
 	8.0, 6.0, 4.0, 3.0,
 	2.0,
 	1.5, 1.0, 0.5, 0.25,
-	0.0
 };
-
+#define N_SCALES G_N_ELEMENTS(scales)
+#define HOME_SCALE 2.0
 
 /*==========================================================================*/
 /* Local function prototypes                                                */
@@ -232,6 +232,16 @@ gl_view_class_init (glViewClass *class)
 			      G_TYPE_NONE,
 			      2, G_TYPE_DOUBLE, G_TYPE_DOUBLE);
 
+	signals[POINTER_EXIT] =
+		g_signal_new ("pointer_exit",
+			      G_OBJECT_CLASS_TYPE (object_class),
+			      G_SIGNAL_RUN_LAST,
+			      G_STRUCT_OFFSET (glViewClass, pointer_exit),
+			      NULL, NULL,
+			      gl_marshal_VOID__VOID,
+			      G_TYPE_NONE,
+			      0);
+
 	signals[MODE_CHANGED] =
 		g_signal_new ("mode_changed",
 			      G_OBJECT_CLASS_TYPE (object_class),
@@ -458,7 +468,7 @@ get_apropriate_scale (gdouble w, gdouble h)
 	w_screen = (gdouble) gdk_screen_width ();
 	h_screen = (gdouble) gdk_screen_height ();
 
-	for (i = 0; scales[i] > 0.0; i++) {
+	for (i = 0; i < N_SCALES; i++) {
 		k = scales[i];
 		if (k <= HOME_SCALE) {
 			if ((k * w < (w_screen - 256))
@@ -1618,7 +1628,7 @@ gl_view_zoom_in (glView *view)
 	/* Find index of current scale (or best match) */
 	i_min = 1;		/* start with 2nd largest scale */
 	dist_min = fabs (scales[1] - view->scale);
-	for (i = 2; scales[i] != 0.0; i++) {
+	for (i = 2; i < N_SCALES; i++) {
 		dist = fabs (scales[i] - view->scale);
 		if (dist < dist_min) {
 			i_min = i;
@@ -1649,7 +1659,7 @@ gl_view_zoom_out (glView *view)
 	/* Find index of current scale (or best match) */
 	i_min = 0;		/* start with largest scale */
 	dist_min = fabs (scales[0] - view->scale);
-	for (i = 1; scales[i] != 0.0; i++) {
+	for (i = 1; i < N_SCALES; i++) {
 		dist = fabs (scales[i] - view->scale);
 		if (dist < dist_min) {
 			i_min = i;
@@ -1658,10 +1668,10 @@ gl_view_zoom_out (glView *view)
 	}
 
 	/* zoom out one "notch" */
-	if (scales[i_min] == 0.0)
+	if (i_min >= N_SCALES)
 		return;
 	i = i_min + 1;
-	if (scales[i] == 0.0)
+	if (i >= N_SCALES)
 		return;
 	gl_view_set_zoom (view, scales[i] / HOME_SCALE);
 
@@ -1702,6 +1712,32 @@ gl_view_get_zoom (glView *view)
 	return view->scale / HOME_SCALE;
 }
 
+/*****************************************************************************/
+/* Is this the maximum zoom level.                                           */
+/*****************************************************************************/
+gboolean
+gl_view_is_zoom_max (glView *view)
+{
+	gl_debug (DEBUG_VIEW, "");
+
+	g_return_val_if_fail (GL_IS_VIEW (view), FALSE);
+
+	return view->scale >= scales[0];
+}
+
+/*****************************************************************************/
+/* Is this the minimum zoom level.                                           */
+/*****************************************************************************/
+gboolean
+gl_view_is_zoom_min (glView *view)
+{
+	gl_debug (DEBUG_VIEW, "");
+
+	g_return_val_if_fail (GL_IS_VIEW (view), FALSE);
+
+	return view->scale <= scales[N_SCALES-1];
+}
+
 /*---------------------------------------------------------------------------*/
 /* PRIVATE.  Canvas event handler.                                           */
 /*---------------------------------------------------------------------------*/
@@ -1867,6 +1903,11 @@ canvas_event_arrow_mode (GnomeCanvas *canvas,
 			return FALSE;
 		}
 
+	case GDK_LEAVE_NOTIFY:
+		gl_debug (DEBUG_VIEW, "LEAVEW_NOTIFY");
+		g_signal_emit (G_OBJECT(view), signals[POINTER_EXIT], 0);
+		return FALSE;
+
 	case GDK_KEY_PRESS:
 		gl_debug (DEBUG_VIEW, "KEY_PRESS");
 		if (!dragging) {
diff --git a/glabels2/src/view.h b/glabels2/src/view.h
index 2d100254..8012245d 100644
--- a/glabels2/src/view.h
+++ b/glabels2/src/view.h
@@ -81,6 +81,7 @@ struct _glViewClass {
 				   gdouble zoom,  gpointer user_data);
 	void (*pointer_moved)     (glView *view,
 				   gdouble x, gdouble y, gpointer user_data);
+	void (*pointer_exit)      (glView *view, gpointer user_data);
 	void (*mode_changed)      (glView *view,
 				   gpointer user_data);
 };
@@ -145,6 +146,10 @@ void      gl_view_set_zoom           (glView            *view,
 
 gdouble   gl_view_get_zoom           (glView            *view);
 
+gboolean  gl_view_is_zoom_max        (glView            *view);
+
+gboolean  gl_view_is_zoom_min        (glView            *view);
+
 
 int       gl_view_item_event_handler (GnomeCanvasItem   *item,
 				      GdkEvent          *event,
-- 
2.39.5