From e66756e2c457d3966c75dbcb87ac2803aedeb5e3 Mon Sep 17 00:00:00 2001
From: Jason Francis <cycl0ps@tuta.io>
Date: Sat, 14 Mar 2020 21:49:46 -0400
Subject: [PATCH] Show headerbar when window is fullscreen

Fixes #14
---
 resources/wdisplays.ui |  2 +-
 src/main.c             | 22 ++++++++++++++++++++++
 src/wdisplays.h        |  1 +
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/resources/wdisplays.ui b/resources/wdisplays.ui
index 35a85c8..bae6442 100644
--- a/resources/wdisplays.ui
+++ b/resources/wdisplays.ui
@@ -76,7 +76,7 @@
         <property name="visible">True</property>
         <property name="can_focus">False</property>
         <child>
-          <object class="GtkBox">
+          <object class="GtkBox" id="main_box">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
             <property name="orientation">vertical</property>
diff --git a/src/main.c b/src/main.c
index 9b90550..f2cd912 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1231,6 +1231,25 @@ static void overlay_selected(GSimpleAction *action, GVariant *param, gpointer da
   }
 }
 
+static void window_state_changed(GtkWidget *window, GdkEventWindowState *event,
+    gpointer data) {
+  struct wd_state *state = data;
+  if (event->changed_mask & GDK_WINDOW_STATE_FULLSCREEN) {
+    g_object_ref(state->header_stack);
+    GtkWidget *container = gtk_widget_get_parent(state->header_stack);
+    gtk_container_remove(GTK_CONTAINER(container), state->header_stack);
+    if (event->new_window_state & GDK_WINDOW_STATE_FULLSCREEN) {
+      gtk_container_add(GTK_CONTAINER(state->main_box), state->header_stack);
+      gtk_box_reorder_child(GTK_BOX(state->main_box), state->header_stack, 0);
+    } else {
+      gtk_widget_unrealize(window);
+      gtk_window_set_titlebar(GTK_WINDOW(window), state->header_stack);
+      gtk_widget_map(window);
+    }
+    g_object_unref(state->header_stack);
+  }
+}
+
 static void activate(GtkApplication* app, gpointer user_data) {
   GdkDisplay *gdk_display = gdk_display_get_default();
   if (!GDK_IS_WAYLAND_DISPLAY(gdk_display)) {
@@ -1254,6 +1273,7 @@ static void activate(GtkApplication* app, gpointer user_data) {
 
   GtkBuilder *builder = gtk_builder_new_from_resource("/wdisplays.ui");
   GtkWidget *window = GTK_WIDGET(gtk_builder_get_object(builder, "heads_window"));
+  state->main_box = GTK_WIDGET(gtk_builder_get_object(builder, "main_box"));
   state->header_stack = GTK_WIDGET(gtk_builder_get_object(builder, "header_stack"));
   state->stack_switcher = GTK_WIDGET(gtk_builder_get_object(builder, "heads_stack_switcher"));
   state->stack = GTK_WIDGET(gtk_builder_get_object(builder, "heads_stack"));
@@ -1277,6 +1297,8 @@ static void activate(GtkApplication* app, gpointer user_data) {
   gtk_builder_connect_signals(builder, state);
   gtk_box_set_homogeneous(GTK_BOX(gtk_builder_get_object(builder, "zoom_box")), FALSE);
 
+  g_signal_connect(window, "window-state-event", G_CALLBACK(window_state_changed), state);
+
   state->canvas = wd_gl_viewport_new();
   gtk_container_add(GTK_CONTAINER(state->scroller), state->canvas);
   gtk_widget_add_events(state->canvas, GDK_POINTER_MOTION_MASK
diff --git a/src/wdisplays.h b/src/wdisplays.h
index e408957..c78128b 100644
--- a/src/wdisplays.h
+++ b/src/wdisplays.h
@@ -209,6 +209,7 @@ struct wd_state {
   bool panning;
   struct wd_point pan_last;
 
+  GtkWidget *main_box;
   GtkWidget *header_stack;
   GtkWidget *stack_switcher;
   GtkWidget *stack;