[gnome-photos/wip/rishi/zoom: 4/8] preview-nav-buttons, preview-view: Allow disabling navigation buttons

[Debarshi Ray <debarshir src gnome org>]

commit 8c936e61216f49b515b4a93a94cb0ad87e7b0986
Author: Debarshi Ray <debarshir gnome org>
Date:   Wed Jun 14 20:42:48 2017 +0200

    preview-nav-buttons, preview-view: Allow disabling navigation buttons
    
    A subsequent commit will use this to disable the next and previous
    buttons when an item is zoomed in.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=742662

 src/photos-preview-nav-buttons.c |   18 ++++++++++++++++--
 src/photos-preview-nav-buttons.h |    3 +++
 src/photos-preview-view.c        |    2 ++
 3 files changed, 21 insertions(+), 2 deletions(-)
---
diff --git a/src/photos-preview-nav-buttons.c b/src/photos-preview-nav-buttons.c
index 8ab43f2..ebcab6f 100644
--- a/src/photos-preview-nav-buttons.c
+++ b/src/photos-preview-nav-buttons.c
@@ -54,6 +54,7 @@ struct _PhotosPreviewNavButtons
   PhotosWindowMode old_mode;
   gboolean enable_next;
   gboolean enable_prev;
+  gboolean show_navigation;
   gboolean visible;
   gboolean visible_internal;
   guint auto_hide_id;
@@ -219,12 +220,12 @@ photos_preview_nav_buttons_update_visibility (PhotosPreviewNavButtons *self)
   if (item == NULL || !self->visible)
     enable_zoom = FALSE;
 
-  if (self->visible_internal && self->enable_next)
+  if (self->visible_internal && self->show_navigation && self->enable_next)
     photos_preview_nav_buttons_fade_in_button (self, self->next_widget);
   else
     photos_preview_nav_buttons_fade_out_button (self, self->next_widget);
 
-  if (self->visible_internal && self->enable_prev)
+  if (self->visible_internal && self->show_navigation && self->enable_prev)
     photos_preview_nav_buttons_fade_in_button (self, self->prev_widget);
   else
     photos_preview_nav_buttons_fade_out_button (self, self->prev_widget);
@@ -675,6 +676,19 @@ photos_preview_nav_buttons_set_mode (PhotosPreviewNavButtons *self, PhotosWindow
 
 
 void
+photos_preview_nav_buttons_set_show_navigation (PhotosPreviewNavButtons *self, gboolean show_navigation)
+{
+  g_return_if_fail (PHOTOS_IS_PREVIEW_NAV_BUTTONS (self));
+
+  if (self->show_navigation == show_navigation)
+    return;
+
+  self->show_navigation = show_navigation;
+  photos_preview_nav_buttons_update_visibility (self);
+}
+
+
+void
 photos_preview_nav_buttons_show (PhotosPreviewNavButtons *self)
 {
   g_return_if_fail (PHOTOS_IS_PREVIEW_NAV_BUTTONS (self));
diff --git a/src/photos-preview-nav-buttons.h b/src/photos-preview-nav-buttons.h
index 986c7e8..128c286 100644
--- a/src/photos-preview-nav-buttons.h
+++ b/src/photos-preview-nav-buttons.h
@@ -44,6 +44,9 @@ void                        photos_preview_nav_buttons_hide               (Photo
 void                        photos_preview_nav_buttons_set_mode           (PhotosPreviewNavButtons *self,
                                                                            PhotosWindowMode old_mode);
 
+void                        photos_preview_nav_buttons_set_show_navigation (PhotosPreviewNavButtons *self,
+                                                                            gboolean show_navigation);
+
 void                        photos_preview_nav_buttons_show               (PhotosPreviewNavButtons *self);
 
 G_END_DECLS
diff --git a/src/photos-preview-view.c b/src/photos-preview-view.c
index 99ca67b..180b6e7 100644
--- a/src/photos-preview-view.c
+++ b/src/photos-preview-view.c
@@ -825,6 +825,7 @@ photos_preview_view_window_mode_changed (PhotosPreviewView *self, PhotosWindowMo
     case PHOTOS_WINDOW_MODE_PREVIEW:
       gtk_revealer_set_reveal_child (GTK_REVEALER (self->revealer), FALSE);
       photos_edit_palette_hide_details (PHOTOS_EDIT_PALETTE (self->palette));
+      photos_preview_nav_buttons_set_show_navigation (self->nav_buttons, TRUE);
       photos_preview_nav_buttons_show (self->nav_buttons);
       break;
 
@@ -1150,6 +1151,7 @@ photos_preview_view_set_mode (PhotosPreviewView *self, PhotosWindowMode old_mode
   g_return_if_fail (old_mode != PHOTOS_WINDOW_MODE_PREVIEW);
 
   photos_preview_nav_buttons_set_mode (self->nav_buttons, old_mode);
+  photos_preview_nav_buttons_set_show_navigation (self->nav_buttons, TRUE);
   photos_preview_nav_buttons_show (self->nav_buttons);
 }