[gnome-flashback/wip/segeiger/gnome-3-18-inputmethods: 2/2] input-sources: implement candidate popup functionality

[Sebastian Geiger <segeiger src gnome org>]

commit cef2a7d6d35fe5be11f399e40b154a584314dc5a
Author: Sebastian Geiger <sbastig gmx net>
Date:   Mon Jan 18 16:20:29 2016 +0100

    input-sources: implement candidate popup functionality

 .../libinput-sources/gf-candidate-popup.c          |  127 +++++++++++++++++++-
 1 files changed, 122 insertions(+), 5 deletions(-)
---
diff --git a/gnome-flashback/libinput-sources/gf-candidate-popup.c 
b/gnome-flashback/libinput-sources/gf-candidate-popup.c
index 5fd7a39..18cf29d 100644
--- a/gnome-flashback/libinput-sources/gf-candidate-popup.c
+++ b/gnome-flashback/libinput-sources/gf-candidate-popup.c
@@ -17,6 +17,8 @@
 
 #include "config.h"
 
+#include <math.h>
+
 #include "gf-candidate-area.h"
 #include "gf-candidate-popup.h"
 
@@ -29,6 +31,11 @@ struct _GfCandidatePopup
   GtkWidget        *pre_edit_text;
   GtkWidget        *aux_text;
   GtkWidget        *candidate_area;
+
+  gint              cursor_x_pos;
+  gint              cursor_y_pos;
+  gint              cursor_height;
+  gint              cursor_width;
 };
 
 G_DEFINE_TYPE (GfCandidatePopup, gf_candidate_popup, GF_TYPE_POPUP_WINDOW)
@@ -39,8 +46,53 @@ set_cursor_location_cb (IBusPanelService *service,
                         gint              y,
                         gint              w,
                         gint              h,
-                        gpointer          user_data)
+                        GfCandidatePopup *popup)
 {
+  popup->cursor_x_pos = x;
+  popup->cursor_y_pos = y;
+  popup->cursor_height = h;
+  popup->cursor_width = w;
+}
+
+static void
+update_window_location (GfCandidatePopup *popup)
+{
+  gint popup_height, popup_width;
+  GdkScreen *screen;
+  GdkWindow *window;
+  GdkRectangle monitor_geometry;
+  GtkRequisition preferred_window_size;
+  gint monitor;
+  gint x, y;
+
+  gtk_window_get_size (GTK_WINDOW (popup), &popup_width, &popup_height);
+
+  window = gtk_widget_get_window (GTK_WIDGET (popup));
+
+  if (window == NULL)
+    return;
+
+  screen = gdk_window_get_screen (window);
+  monitor = gdk_screen_get_monitor_at_window (screen, window);
+  gdk_screen_get_monitor_geometry (screen, monitor, &monitor_geometry);
+
+  x = popup->cursor_x_pos;
+  y = popup->cursor_y_pos;
+
+  if (x + popup_width > monitor_geometry.width)
+    x = x - popup_width + popup->cursor_width;
+
+  if (y + popup_height > monitor_geometry.height)
+    y = y - popup_height;
+  else
+    y = y + popup->cursor_height;
+
+  gtk_window_move (GTK_WINDOW (popup), x, y);
+
+  gtk_widget_get_preferred_size (GTK_WIDGET (popup), NULL,
+                                 &preferred_window_size);
+  gtk_window_resize (GTK_WINDOW (popup),
+                     preferred_window_size.width, preferred_window_size.height);
 }
 
 static void
@@ -126,26 +178,89 @@ static void
 update_lookup_table_cb (IBusPanelService *service,
                         IBusLookupTable  *lookup_table,
                         gboolean          visible,
-                        gpointer          user_data)
+                        GfCandidatePopup *popup)
 {
+  guint n_candidates;
+  guint cursor_position;
+  guint page_size;
+  guint n_pages;
+  guint page;
+  guint start_index;
+  guint end_index;
+  guint i;
+
+  GSList *indexes, *candidates;
+  IBusText *index_label;
+  gint orientation;
+
+  indexes = NULL;
+  candidates = NULL;
+
+  gtk_widget_set_visible (GTK_WIDGET (popup), visible);
+  update_window_location (popup);
+  n_candidates = ibus_lookup_table_get_number_of_candidates (lookup_table);
+  cursor_position = ibus_lookup_table_get_cursor_pos (lookup_table);
+  page_size = ibus_lookup_table_get_page_size (lookup_table);
+  n_pages = (guint) ceil (n_candidates / ((gdouble) page_size));
+  page = ((cursor_position == 0) ? 0 :
+          (guint) floor (cursor_position / ((gdouble) page_size)));
+  start_index = page * page_size;
+  end_index = MIN ((page + 1) * page_size, n_candidates);
+
+  for (i = 0; (index_label = ibus_lookup_table_get_label (lookup_table, i)) != NULL; i++)
+    {
+      const gchar *text;
+
+      text = ibus_text_get_text (index_label);
+      indexes = g_slist_append (indexes, (gpointer) text);
+    }
+
+  for (i = start_index; i < end_index; i++)
+    {
+      IBusText *ibus_text;
+      const gchar* text;
+
+      ibus_text = ibus_lookup_table_get_candidate (lookup_table, i);
+      text = ibus_text_get_text (ibus_text);
+      candidates = g_slist_append (candidates, (gpointer) text);
+    }
+
+  gf_candidate_area_set_candidates (GF_CANDIDATE_AREA (popup->candidate_area),
+                                    indexes, candidates, cursor_position,
+                                    visible);
+
+  orientation = ibus_lookup_table_get_orientation (lookup_table);
+
+  gf_candidate_area_set_orientation (GF_CANDIDATE_AREA (popup->candidate_area),
+                                     orientation);
+
+  gf_candidate_area_update_buttons (GF_CANDIDATE_AREA (popup->candidate_area),
+                                    ibus_lookup_table_is_round (lookup_table),
+                                    page, n_pages);
+
+  g_slist_free (indexes);
+  g_slist_free (candidates);
 }
 
 static void
 show_lookup_table_cb (IBusPanelService *service,
-                      gpointer          user_data)
+                      GfCandidatePopup *popup)
 {
+  gtk_widget_show (GTK_WIDGET (popup));
+  update_window_location (popup);
 }
 
 static void
 hide_lookup_table_cb (IBusPanelService *service,
-                      gpointer          user_data)
+                      GfCandidatePopup *popup)
 {
+  gtk_widget_hide (GTK_WIDGET (popup));
 }
 
 static void
 focus_out_cb (IBusPanelService *service,
               const gchar      *input_context_path,
-              gpointer          user_data)
+              gpointer         *popup)
 {
 }
 
@@ -211,6 +326,8 @@ gf_candidate_popup_init (GfCandidatePopup *popup)
   gtk_window_set_focus_on_map (window, TRUE);
   gtk_window_set_type_hint (window, GDK_WINDOW_TYPE_HINT_NORMAL);
 
+  gtk_widget_set_size_request (GTK_WIDGET (popup), 1, 1);
+
   layout = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
   gtk_container_add (GTK_CONTAINER (popup), layout);
   gtk_widget_show (layout);