button-widget: wide panels, more suitable resize limits on Widgets an…

…d arrows

Set better limits to the size taken by all BUTTON_WIDGETs when the panel is wide.
For a wide panel (example vertical panel 100px wide) a widget would, before, take a space of 100x100 (for max hardcoded icon size 48px)
Now if panel width exceeds 50px, the widgets' height stays at 50 and does not grow in height anymore.
Same behaviour applies on wide horizontal panels.
The GTK_ARROW also resizes properly for wide panel on BUTTON_WIDGETs with property "has_arrow"

mate-panel/button-widget.c

@@ -303,35 +303,40 @@ calc_arrow (PanelOrientation  orientation,
 	    gdouble          *size)
 {
 	GtkArrowType retval = GTK_ARROW_UP;
-	double scale;
 
-	scale = (orientation & PANEL_HORIZONTAL_MASK ? button_height : button_width) / 48.0;
-
-	*size = 12 * scale;
+	if (orientation & PANEL_HORIZONTAL_MASK) {
+		if (button_width > 50)
+			button_width = 50;
+	} else {
+		if (button_height > 50)
+			button_height = 50;
+	}
+
+	*size = (orientation & PANEL_HORIZONTAL_MASK ? button_width : button_height) / 2;
 	*angle = 0;
 
 	switch (orientation) {
 	case PANEL_ORIENTATION_TOP:
-		*x     = scale * 3;
-		*y     = scale * (48 - 13);
+		*x     = (button_width - (*size)) / 2;
+		*y     = button_height * .99 - (*size) / (3/2);	// 3/2 is the approximate ratio of GTK arrows
 		*angle = G_PI;
 		retval = GTK_ARROW_DOWN;
 		break;
 	case PANEL_ORIENTATION_BOTTOM:
-		*x     = scale * (48 - 13);
-		*y     = scale * 1;
+		*x     = (button_width - (*size)) / 2;
+		*y     = button_height * .01;
 		*angle = 0;
 		retval = GTK_ARROW_UP;
 		break;
 	case PANEL_ORIENTATION_LEFT:
-		*x     = scale * (48 - 13);
-		*y     = scale * 3;
+		*x     = button_width * .99 - (*size) / (3/2);	// 3/2 is the approximate ratio of GTK arrows
+		*y     = (button_height - (*size)) / 2;
 		*angle = G_PI / 2;
 		retval = GTK_ARROW_RIGHT;
 		break;
 	case PANEL_ORIENTATION_RIGHT:
-		*x     = scale * 1;
-		*y     = scale * 3;
+		*x     = button_width * .01;
+		*y     = (button_height - (*size)) / 2;
 		*angle = 3 * (G_PI / 2);
 		retval = GTK_ARROW_LEFT;
 		break;
@@ -446,9 +451,14 @@ button_widget_get_preferred_width (GtkWidget *widget,
 
 	parent = gtk_widget_get_parent (widget);
 
-	if (button_widget->priv->orientation & PANEL_HORIZONTAL_MASK)
+	if (button_widget->priv->orientation & PANEL_HORIZONTAL_MASK){
 		size = gtk_widget_get_allocated_height (parent);
-	else
+
+		/* should get this value (50) from gsettings, user defined value in properties of the panel (max_icon_size) OR use 48*/
+		if ( size > 50 )
+			size = 50;	
+
+	} else
 		size = gtk_widget_get_allocated_width (parent);
 
 	*minimal_width = *natural_width = size;
@@ -467,8 +477,14 @@ button_widget_get_preferred_height (GtkWidget *widget,
 
 	if (button_widget->priv->orientation & PANEL_HORIZONTAL_MASK)
 		size = gtk_widget_get_allocated_height (parent);
-	else
+	else {
 		size = gtk_widget_get_allocated_width (parent);
+
+		/* should get this value (50) from gsettings, user defined value in properties of the panel (max_icon_size) OR use 48*/
+		if ( size > 50 )
+			size = 50;	
+
+	}
 
 	*minimal_height = *natural_height = size;
 }
@@ -480,6 +496,17 @@ button_widget_size_allocate (GtkWidget     *widget,
 	ButtonWidget *button_widget = BUTTON_WIDGET (widget);
 	int           size;
 
+	/* should get this value (50) from gsettings, user defined value in properties of the panel (max_icon_size) OR use 48?*/
+	if (button_widget->priv->orientation & PANEL_HORIZONTAL_MASK) {
+		if ( allocation->height > 50 ) {
+			allocation->width = 50;	
+		}
+	} else {
+		if ( allocation->width > 50 ) {
+			allocation->height = 50;	
+		}
+	}
+
 	GTK_WIDGET_CLASS (button_widget_parent_class)->size_allocate (widget, allocation);
 
 	if (button_widget->priv->orientation & PANEL_HORIZONTAL_MASK)