GTK: show focus indicator for graph surface

4 files changed, 31 insertions, 2 deletions

diff --git a/tikzit/TODO b/tikzit/TODO
index 3ecc9b2..ca1a1b9 100644
--- a/tikzit/TODO
+++ b/tikzit/TODO
@@ -1,5 +1,4 @@
 GTK port:
- - possibly indicate when the graph surface has focus?
  - Use GooCanvas for the graph display
 
 
diff --git a/tikzit/src/gtk/GraphRenderer.m b/tikzit/src/gtk/GraphRenderer.m
index 76fe551..4278551 100644
--- a/tikzit/src/gtk/GraphRenderer.m
+++ b/tikzit/src/gtk/GraphRenderer.m
@@ -91,8 +91,11 @@ void graph_renderer_expose_event(GtkWidget *widget, GdkEventExpose *event);
     [self invalidateGraph];
 }
 
-- (void) renderWithContext:(id<RenderContext>)context onSurface:(id<Surface>)surface {
+- (void) renderWithContext:(id<RenderContext>)context onSurface:(id<Surface>)s {
     [self renderWithContext:context];
+    if ([s hasFocus]) {
+        [s renderFocus];
+    }
 }
 
 - (void) renderWithContext:(id<RenderContext>)context {
diff --git a/tikzit/src/gtk/Surface.h b/tikzit/src/gtk/Surface.h
index b6d8d2e..db4288e 100644
--- a/tikzit/src/gtk/Surface.h
+++ b/tikzit/src/gtk/Surface.h
@@ -99,6 +99,9 @@ typedef enum {
 - (void) zoomResetAboutPoint:(NSPoint)p;
 
 - (void) setCursor:(Cursor)c;
+
+- (BOOL) hasFocus;
+- (void) renderFocus;
 @end
 
 // vim:ft=objc:ts=8:et:sts=4:sw=4
diff --git a/tikzit/src/gtk/WidgetSurface.m b/tikzit/src/gtk/WidgetSurface.m
index 64adc25..680cf90 100644
--- a/tikzit/src/gtk/WidgetSurface.m
+++ b/tikzit/src/gtk/WidgetSurface.m
@@ -225,6 +225,30 @@ static gboolean scroll_event_cb (GtkWidget *widget, GdkEventScroll *event, Widge
     }
 }
 
+- (BOOL) hasFocus {
+    return gtk_widget_has_focus (widget);
+}
+
+- (void) renderFocus {
+    GdkWindow *window = gtk_widget_get_window (widget);
+    if (window) {
+        int width = 0;
+        int height = 0;
+        gdk_drawable_get_size (window, &width, &height);
+        gtk_paint_focus (gtk_widget_get_style (widget),
+                window,
+                GTK_STATE_NORMAL,
+                NULL,
+                widget,
+                NULL,
+                0,
+                0,
+                width,
+                height
+                );
+    }
+}
+
 - (CGFloat) defaultScale {
     return defaultScale;
 }