[gtk+/wip/overlay-scrollbar: 5/5] Port the overlayscroll example

[Matthias Clasen <matthiasc src gnome org>]

commit 8c159e5d67839964e33b761b946392a0dd22e739
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Oct 9 17:03:52 2014 -0400

    Port the overlayscroll example
    
    Make the overlayscroll example use the overlay scrolling that is
    now built into GtkScrolledWindow, instead of the manual prototype.

 tests/overlayscroll.c |  304 ++----------------------------------------------
 1 files changed, 13 insertions(+), 291 deletions(-)
---
diff --git a/tests/overlayscroll.c b/tests/overlayscroll.c
index 478c229..e432331 100644
--- a/tests/overlayscroll.c
+++ b/tests/overlayscroll.c
@@ -18,233 +18,6 @@
 #include <gtk/gtk.h>
 #include <string.h>
 
-typedef struct {
-  GtkWidget *sw;
-  GtkWidget *rv;
-  gint64 last_scroll_time;
-  gboolean over;
-  gboolean dragging;
-  gboolean autodetect;
-  gboolean touch_mode;
-} IndicatorData;
-
-IndicatorData *
-get_indicator_data (GtkWidget *sb)
-{
-  IndicatorData *data;
-
-  data = (IndicatorData *) g_object_get_data (G_OBJECT (sb), "indicator-data");
-
-  if (!data)
-    {
-      data = g_new0 (IndicatorData, 1);
-      g_object_set_data_full (G_OBJECT (sb), "indicator-data", data, g_free);
-    }
-
-  return data;
-}
-
-static gboolean
-conceil_scrollbar (gpointer data)
-{
-  GtkWidget *sb = data;
-  IndicatorData *id = get_indicator_data (sb);
-
-  if (g_get_monotonic_time () - id->last_scroll_time >= 1000000 &&
-      id->touch_mode &&
-      !id->over &&
-      !id->dragging)
-    {
-      if (gtk_revealer_get_reveal_child (GTK_REVEALER (id->rv)))
-        gtk_revealer_set_reveal_child (GTK_REVEALER (id->rv), FALSE);
-    }
-
-  return G_SOURCE_CONTINUE;
-}
-
-static void
-value_changed (GtkAdjustment *adj, GtkWidget *sb)
-{
-  IndicatorData *id = get_indicator_data (sb);
-
-  if (id->touch_mode &&
-      !gtk_revealer_get_reveal_child (GTK_REVEALER (id->rv)))
-    gtk_revealer_set_reveal_child (GTK_REVEALER (id->rv), TRUE);
-
-  id->last_scroll_time = g_get_monotonic_time ();  
-}
-
-static gboolean
-enter_notify (GtkWidget *sb, GdkEventCrossing *event)
-{
-  GtkStyleContext *context = gtk_widget_get_style_context (sb);
-  IndicatorData *id = get_indicator_data (sb);
-
-  gtk_style_context_add_class (context, "locked");
-  gtk_widget_queue_resize (sb);
-  id->over = TRUE;
-
-  return G_SOURCE_CONTINUE;
-}
-
-static gboolean
-leave_notify (GtkWidget *sb, GdkEventCrossing *event)
-{
-  GtkStyleContext *context = gtk_widget_get_style_context (sb);
-  IndicatorData *id = get_indicator_data (sb);
-
-  gtk_style_context_remove_class (context, "locked");
-  gtk_widget_queue_resize (sb);
-  id->over = FALSE;
-
-  return G_SOURCE_CONTINUE;
-}
-
-static void
-style_changed (GtkStyleContext *context, GtkWidget *sb)
-{
-  IndicatorData *id = get_indicator_data (sb);
-
-  if (gtk_style_context_has_class (context, "dragging"))
-    id->dragging = TRUE;
-  else
-    id->dragging = FALSE;
-}
-
-static const gchar *
-input_source (GdkInputSource source)
-{
-  switch (source)
-    {
-    case GDK_SOURCE_MOUSE: return "mouse";
-    case GDK_SOURCE_PEN: return "pen";
-    case GDK_SOURCE_ERASER: return "eraser";
-    case GDK_SOURCE_CURSOR: return "cursor";
-    case GDK_SOURCE_KEYBOARD: return "keyboard";
-    case GDK_SOURCE_TOUCHSCREEN: return "touchscreen";
-    case GDK_SOURCE_TOUCHPAD: return "touchpad";
-    default: return "unknown";
-    }
-}
-
-static void
-list_devices (GdkDeviceManager *dm)
-{
-  GList *devices, *l;
-  GList *slaves, *s;
-  GdkDevice *device;
-
-  devices = gdk_device_manager_list_devices (dm, GDK_DEVICE_TYPE_MASTER);
-  for (l = devices; l; l = l->next)
-    {
-      device = l->data;
-      g_print ("%s%s\n",
-               gdk_device_get_name (device),
-               gdk_device_get_has_cursor (device) ? ", has cursor" : "");
-      slaves = gdk_device_list_slave_devices (device);
-      for (s = slaves; s; s = s->next)
-        {
-          device = s->data;
-          g_print ("  ↳ %s, %s\n",
-                   gdk_device_get_name (device),
-                   input_source (gdk_device_get_source (device)));
-        }
-      g_list_free (slaves);
-    }
-  g_list_free (devices);
-}
-
-static gboolean
-has_mouse (GdkDeviceManager *dm)
-{
-  GdkDevice *cp;
-  GList *slaves, *s;
-  GdkDevice *device;
-  gboolean found;
-
-  found = FALSE;
-
-  cp = gdk_device_manager_get_client_pointer (dm);
-  slaves = gdk_device_list_slave_devices (cp);
-  for (s = slaves; s; s = s->next)
-    {
-      device = s->data;
-
-      if (gdk_device_get_source (device) != GDK_SOURCE_MOUSE)
-        continue;
-
-      if (strstr (gdk_device_get_name (device), "XTEST"))
-        continue;
-
-      if (strstr (gdk_device_get_name (device), "TrackPoint"))
-        continue;
-
-      if (g_object_get_data (G_OBJECT (device), "removed"))
-        continue;
-
-      found = TRUE;
-      break;
-    }
-  g_list_free (slaves);
-
-  return found;
-}
-
-static void
-update_touch_mode (IndicatorData *id, gboolean touch_mode)
-{
-  id->touch_mode = touch_mode;
-  gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (id->sw),
-                                  GTK_POLICY_NEVER,
-                                  id->touch_mode ? GTK_POLICY_EXTERNAL : GTK_POLICY_AUTOMATIC);
-
-  g_print ("touch mode now %s\n", id->touch_mode ? "ON" : "OFF");
-}
-
-static void
-device_added (GdkDeviceManager *dm, GdkDevice *device, IndicatorData *id)
-{
-  if (id->autodetect)
-    update_touch_mode (id, !has_mouse (dm));
-}
-
-static void
-device_removed (GdkDeviceManager *dm, GdkDevice *device, IndicatorData *id)
-{
-  if (id->autodetect)
-    {
-      /* We need to work around the fact that ::device-removed is emitted
-       * before the device is removed from the list.
-       */
-      g_object_set_data (G_OBJECT (device), "removed", GINT_TO_POINTER (1));
-      update_touch_mode (id, !has_mouse (dm));
-    }
-}
-
-static void
-mode_changed (GtkComboBox *combo, IndicatorData *id)
-{
-  GdkDeviceManager *dm;
-  gint active = gtk_combo_box_get_active (combo);
-
-  dm = gdk_display_get_device_manager (gdk_display_get_default ());
-  if (active == 0)
-    {
-      id->autodetect = TRUE;
-      update_touch_mode (id, !has_mouse (dm));
-    }
-  else if (active == 1)
-    {
-      id->autodetect = FALSE;
-      update_touch_mode (id, FALSE);
-    }
-  else
-    {
-      id->autodetect = FALSE;
-      update_touch_mode (id, TRUE);
-    }
-}
-
 static gchar *
 get_content (void)
 {
@@ -258,21 +31,13 @@ get_content (void)
   return g_string_free (s, FALSE);
 }
 
-static const gchar data[] =
-  ".scrollbar.overlay-indicator.dragging,"
-  ".scrollbar.overlay-indicator.locked {"
-  "   -GtkRange-slider-width: 15;"
-  "}"
-  ".scrollbar.overlay-indicator.dragging.trough,"
-  ".scrollbar.overlay-indicator.locked.trough {"
-  "   background-color: alpha(black,0.1);"
-  "}"
-  ".scrollbar.overlay-indicator {"
-  "   -GtkRange-slider-width: 10;"
-  "}"
-  ".scrollbar.overlay-indicator.trough {"
-  "   background-color: transparent;"
-  "}";
+static void
+mode_changed (GtkComboBox *combo, GtkScrolledWindow *sw)
+{
+  gint active = gtk_combo_box_get_active (combo);
+
+  gtk_scrolled_window_set_overlay_scrolling (sw, active == 1);
+}
 
 int
 main (int argc, char *argv[])
@@ -282,24 +47,12 @@ main (int argc, char *argv[])
   GtkWidget *box;
   GtkWidget *sw;
   GtkWidget *tv;
-  GtkWidget *ov;
-  GtkWidget *rv;
-  GtkWidget *sb;
   GtkWidget *sb2;
   GtkWidget *combo;
   GtkAdjustment *adj;
-  GtkCssProvider *provider;
-  IndicatorData *id;
-  GdkDeviceManager *dm;
 
   gtk_init (&argc, &argv);
 
-  provider = gtk_css_provider_new ();
-  gtk_css_provider_load_from_data (provider, data, -1, NULL);
-  gtk_style_context_add_provider_for_screen (gdk_screen_get_default (),
-                                             GTK_STYLE_PROVIDER (provider),
-                                             GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
-
   window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
   gtk_window_set_default_size (GTK_WINDOW (window), 640, 480);
   g_signal_connect (window, "delete-event", G_CALLBACK (gtk_main_quit), NULL);
@@ -307,15 +60,12 @@ main (int argc, char *argv[])
   box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 20);
   gtk_container_add (GTK_CONTAINER (window), box);
 
-  ov = gtk_overlay_new ();
-  gtk_box_pack_start (GTK_BOX (box), ov, TRUE, TRUE, 0);
-
   sw = gtk_scrolled_window_new (NULL, NULL);
   gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
                                   GTK_POLICY_NEVER,
-                                  GTK_POLICY_EXTERNAL);
+                                  GTK_POLICY_AUTOMATIC);
 
-  gtk_container_add (GTK_CONTAINER (ov), sw);
+  gtk_box_pack_start (GTK_BOX (box), sw, TRUE, TRUE, 0);
 
   content = get_content ();
 
@@ -328,34 +78,12 @@ main (int argc, char *argv[])
 
   adj = gtk_scrollable_get_vadjustment (GTK_SCROLLABLE (tv));
 
-  sb = gtk_scrollbar_new (GTK_ORIENTATION_VERTICAL, adj);
-
-  rv = gtk_revealer_new ();
-  gtk_revealer_set_transition_type (GTK_REVEALER (rv), GTK_REVEALER_TRANSITION_TYPE_CROSSFADE);
-  gtk_revealer_set_transition_duration (GTK_REVEALER (rv), 750);
-  gtk_container_add (GTK_CONTAINER (rv), sb);
-  gtk_overlay_add_overlay (GTK_OVERLAY (ov), rv);
-  gtk_widget_set_halign (rv, GTK_ALIGN_END);
-  gtk_widget_set_valign (rv, GTK_ALIGN_FILL);
-
-  id = get_indicator_data (sb);
-  id->sw = sw;
-  id->rv = rv;
-
-  gtk_style_context_add_class (gtk_widget_get_style_context (sb), "overlay-indicator");
-  g_signal_connect (sb, "enter-notify-event", G_CALLBACK (enter_notify), NULL);
-  g_signal_connect (sb, "leave-notify-event", G_CALLBACK (leave_notify), NULL);
-  g_signal_connect (gtk_widget_get_style_context (sb), "changed", G_CALLBACK (style_changed), sb);
-  g_signal_connect (adj, "value-changed", G_CALLBACK (value_changed), sb);
-  g_timeout_add (500, conceil_scrollbar, sb);
-
   combo = gtk_combo_box_text_new ();
   gtk_widget_set_valign (combo, GTK_ALIGN_START);
-  gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo), "Autodetect");
-  gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo), "Mouse mode");
-  gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo), "Touch mode");
-  g_signal_connect (combo, "changed", G_CALLBACK (mode_changed), id);
-  gtk_combo_box_set_active (GTK_COMBO_BOX (combo), 0);
+  gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo), "Traditional");
+  gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo), "Overlay");
+  g_signal_connect (combo, "changed", G_CALLBACK (mode_changed), sw);
+  gtk_combo_box_set_active (GTK_COMBO_BOX (combo), 1);
 
   gtk_container_add (GTK_CONTAINER (box), combo);
 
@@ -364,12 +92,6 @@ main (int argc, char *argv[])
 
   gtk_widget_show_all (window);
 
-  dm = gdk_display_get_device_manager (gdk_display_get_default ());
-  list_devices (dm);
-
-  g_signal_connect (dm, "device-added", G_CALLBACK (device_added), id);
-  g_signal_connect (dm, "device-removed", G_CALLBACK (device_removed), id);
-
   gtk_main ();
 
   return 0;