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[empathy] Add EmpathyLiveSearch widget

commit d4e8ed896d085e3ad76c07861a93c3366d34f340
Author: Felix Kaser <f kaser gmx net>
Date:   Tue Jun 8 17:13:44 2010 +0200

    Add EmpathyLiveSearch widget

 libempathy-gtk/Makefile.am           |    2 +
 libempathy-gtk/empathy-live-search.c |  559 ++++++++++++++++++++++++++++++++++
 libempathy-gtk/empathy-live-search.h |   71 +++++
 3 files changed, 632 insertions(+), 0 deletions(-)
---
diff --git a/libempathy-gtk/Makefile.am b/libempathy-gtk/Makefile.am
index 6ec319e..377929a 100644
--- a/libempathy-gtk/Makefile.am
+++ b/libempathy-gtk/Makefile.am
@@ -47,6 +47,7 @@ libempathy_gtk_handwritten_source =            	\
 	empathy-contact-list-store.c		\
 	empathy-contact-list-view.c		\
 	empathy-contact-menu.c			\
+	empathy-live-search.c			\
 	empathy-contact-selector.c		\
 	empathy-contact-selector-dialog.c \
 	empathy-contact-widget.c		\
@@ -93,6 +94,7 @@ libempathy_gtk_headers =			\
 	empathy-contact-list-store.h		\
 	empathy-contact-list-view.h		\
 	empathy-contact-menu.h			\
+	empathy-live-search.h			\
 	empathy-contact-selector.h		\
 	empathy-contact-selector-dialog.h \
 	empathy-contact-widget.h		\
diff --git a/libempathy-gtk/empathy-live-search.c b/libempathy-gtk/empathy-live-search.c
new file mode 100644
index 0000000..cf80f9a
--- /dev/null
+++ b/libempathy-gtk/empathy-live-search.c
@@ -0,0 +1,559 @@
+/*
+ * Copyright (C) 2010 Collabora Ltd.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Authors: Felix Kaser <felix kaser collabora co uk>
+ */
+
+#include <config.h>
+#include <string.h>
+
+#include <gtk/gtk.h>
+#include <gdk/gdkkeysyms.h>
+
+#include <libempathy/empathy-utils.h>
+
+#include "empathy-live-search.h"
+
+G_DEFINE_TYPE (EmpathyLiveSearch, empathy_live_search, GTK_TYPE_HBOX)
+
+#define GET_PRIV(obj) EMPATHY_GET_PRIV (obj, EmpathyLiveSearch)
+
+typedef struct
+{
+  GtkWidget *search_entry;
+  GtkWidget *hook_widget;
+
+  gunichar *text_stripped;
+} EmpathyLiveSearchPriv;
+
+enum
+{
+  PROP_0,
+  PROP_HOOK_WIDGET,
+  PROP_TEXT
+};
+
+static void live_search_hook_widget_destroy_cb (GtkObject *object,
+    gpointer user_data);
+
+/**
+ * stripped_char:
+ *
+ * Returns a stripped version of @ch, removing any case, accentuation
+ * mark, or any special mark on it.
+ **/
+static gunichar
+stripped_char (gunichar ch)
+{
+  gunichar retval = 0;
+  GUnicodeType utype;
+  gunichar *decomp;
+  gsize dlen;
+
+  utype = g_unichar_type (ch);
+
+  switch (utype)
+    {
+    case G_UNICODE_CONTROL:
+    case G_UNICODE_FORMAT:
+    case G_UNICODE_UNASSIGNED:
+    case G_UNICODE_COMBINING_MARK:
+      /* Ignore those */
+      break;
+    default:
+      ch = g_unichar_tolower (ch);
+      decomp = g_unicode_canonical_decomposition (ch, &dlen);
+      if (decomp != NULL)
+        {
+          retval = decomp[0];
+          g_free (decomp);
+        }
+    }
+
+  return retval;
+}
+
+static gunichar *
+strip_utf8_string (const gchar *string)
+{
+  gunichar *ret;
+  gint ret_len;
+  const gchar *p;
+
+  if (EMP_STR_EMPTY (string))
+    return NULL;
+
+  ret = g_malloc (sizeof (gunichar) * (strlen (string) + 1));
+  ret_len = 0;
+
+  for (p = string; *p != '\0'; p = g_utf8_next_char (p))
+    {
+      gunichar sc;
+
+      sc = stripped_char (g_utf8_get_char (p));
+      if (sc != 0)
+        ret[ret_len++] = sc;
+    }
+
+  ret[ret_len] = 0;
+
+  return ret;
+}
+
+static gboolean
+live_search_entry_key_pressed_cb (GtkEntry *entry,
+    GdkEventKey *event,
+    gpointer user_data)
+{
+  EmpathyLiveSearch *self = EMPATHY_LIVE_SEARCH (user_data);
+
+  /* if esc key pressed, hide the search */
+  if (event->keyval == GDK_Escape)
+    {
+      gtk_widget_hide (GTK_WIDGET (self));
+      return TRUE;
+    }
+
+  return FALSE;
+}
+
+static void
+live_search_text_changed (GtkEntry *entry,
+    gpointer user_data)
+{
+  EmpathyLiveSearch *self = EMPATHY_LIVE_SEARCH (user_data);
+  EmpathyLiveSearchPriv *priv = GET_PRIV (self);
+  const gchar *text;
+
+  text = gtk_entry_get_text (entry);
+
+  g_free (priv->text_stripped);
+  priv->text_stripped = strip_utf8_string (text);
+  g_object_notify (G_OBJECT (self), "text");
+
+  if (g_utf8_strlen (text, -1) < 1)
+    gtk_widget_hide (GTK_WIDGET (self));
+  else
+    gtk_widget_show (GTK_WIDGET (self));
+}
+
+static void
+live_search_close_pressed (GtkEntry *entry,
+    GtkEntryIconPosition icon_pos,
+    GdkEvent *event,
+    gpointer user_data)
+{
+  EmpathyLiveSearch *self = EMPATHY_LIVE_SEARCH (user_data);
+
+  gtk_widget_hide (GTK_WIDGET (self));
+}
+
+static gboolean
+live_search_key_press_event_cb (GtkWidget *widget,
+    GdkEventKey *event,
+    gpointer user_data)
+{
+  EmpathyLiveSearch *self = EMPATHY_LIVE_SEARCH (user_data);
+  EmpathyLiveSearchPriv *priv = GET_PRIV (self);
+  GdkEvent *new_event;
+  gboolean ret;
+
+  /* dont forward this event to the entry, else the event is consumed by the
+   * entry and does not close the window */
+  if (!gtk_widget_get_visible (GTK_WIDGET (self)) &&
+      event->keyval == GDK_Escape)
+    return FALSE;
+
+  /* do not show the search if CTRL and/or ALT are pressed with a key
+   * this is needed, because otherwise the CTRL + F accel would not work,
+   * because the entry consumes it */
+  if (event->state & (GDK_MOD1_MASK | GDK_CONTROL_MASK) ||
+      event->keyval == GDK_Control_L ||
+      event->keyval == GDK_Control_R)
+    return FALSE;
+
+  /* realize the widget if it is not realized yet */
+  gtk_widget_realize (priv->search_entry);
+  if (!gtk_widget_has_focus (priv->search_entry))
+    {
+      gtk_widget_grab_focus (priv->search_entry);
+      gtk_editable_set_position (GTK_EDITABLE (priv->search_entry), -1);
+    }
+
+  /* forward the event to the search entry */
+  new_event = gdk_event_copy ((GdkEvent *) event);
+  ret = gtk_widget_event (priv->search_entry, new_event);
+  gdk_event_free (new_event);
+
+  return ret;
+}
+
+static void
+live_search_release_hook_widget (EmpathyLiveSearch *self)
+{
+  EmpathyLiveSearchPriv *priv = GET_PRIV (self);
+
+  /* remove old handlers if old source was not null */
+  if (priv->hook_widget != NULL)
+    {
+      g_signal_handlers_disconnect_by_func (priv->hook_widget,
+          live_search_key_press_event_cb, self);
+      g_signal_handlers_disconnect_by_func (priv->hook_widget,
+          live_search_hook_widget_destroy_cb, self);
+      g_object_unref (priv->hook_widget);
+      priv->hook_widget = NULL;
+    }
+}
+
+static void
+live_search_hook_widget_destroy_cb (GtkObject *object,
+    gpointer user_data)
+{
+  EmpathyLiveSearch *self = EMPATHY_LIVE_SEARCH (user_data);
+
+  /* unref the hook widget and hide search */
+  live_search_release_hook_widget (self);
+  gtk_widget_hide (GTK_WIDGET (self));
+}
+
+static void
+live_search_dispose (GObject *obj)
+{
+  EmpathyLiveSearch *self = EMPATHY_LIVE_SEARCH (obj);
+
+  live_search_release_hook_widget (self);
+
+  if (G_OBJECT_CLASS (empathy_live_search_parent_class)->dispose != NULL)
+    G_OBJECT_CLASS (empathy_live_search_parent_class)->dispose (obj);
+}
+
+static void
+live_search_finalize (GObject *obj)
+{
+  EmpathyLiveSearch *self = EMPATHY_LIVE_SEARCH (obj);
+  EmpathyLiveSearchPriv *priv = GET_PRIV (self);
+
+  g_free (priv->text_stripped);
+
+  if (G_OBJECT_CLASS (empathy_live_search_parent_class)->finalize != NULL)
+    G_OBJECT_CLASS (empathy_live_search_parent_class)->finalize (obj);
+}
+
+static void
+live_search_get_property (GObject *object,
+    guint param_id,
+    GValue *value,
+    GParamSpec *pspec)
+{
+  EmpathyLiveSearch *self = EMPATHY_LIVE_SEARCH (object);
+
+  switch (param_id)
+    {
+    case PROP_HOOK_WIDGET:
+      g_value_set_object (value, empathy_live_search_get_hook_widget (self));
+      break;
+    case PROP_TEXT:
+      g_value_set_string (value, empathy_live_search_get_text (self));
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
+      break;
+    }
+}
+
+static void
+live_search_set_property (GObject *object,
+    guint param_id,
+    const GValue *value,
+    GParamSpec *pspec)
+{
+  EmpathyLiveSearch *self = EMPATHY_LIVE_SEARCH (object);
+
+  switch (param_id) {
+  case PROP_HOOK_WIDGET:
+    empathy_live_search_set_hook_widget (self, g_value_get_object (value));
+    break;
+  case PROP_TEXT:
+    empathy_live_search_set_text (self, g_value_get_string (value));
+    break;
+  default:
+    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
+    break;
+  };
+}
+
+static void
+live_search_hide (GtkWidget *widget)
+{
+  EmpathyLiveSearch *self = EMPATHY_LIVE_SEARCH (widget);
+  EmpathyLiveSearchPriv *priv = GET_PRIV (self);
+
+  GTK_WIDGET_CLASS (empathy_live_search_parent_class)->hide (widget);
+
+  gtk_entry_set_text (GTK_ENTRY (priv->search_entry), "");
+  gtk_widget_grab_focus (priv->hook_widget);
+}
+
+static void
+live_search_show (GtkWidget *widget)
+{
+  EmpathyLiveSearch *self = EMPATHY_LIVE_SEARCH (widget);
+  EmpathyLiveSearchPriv *priv = GET_PRIV (self);
+
+  if (!gtk_widget_has_focus (priv->search_entry))
+    gtk_widget_grab_focus (priv->search_entry);
+
+  GTK_WIDGET_CLASS (empathy_live_search_parent_class)->show (widget);
+}
+
+static void
+live_search_grab_focus (GtkWidget *widget)
+{
+  EmpathyLiveSearch *self = EMPATHY_LIVE_SEARCH (widget);
+  EmpathyLiveSearchPriv *priv = GET_PRIV (self);
+
+  if (!gtk_widget_has_focus (priv->search_entry))
+    gtk_widget_grab_focus (priv->search_entry);
+}
+
+static void
+empathy_live_search_class_init (EmpathyLiveSearchClass *klass)
+{
+  GObjectClass *object_class = (GObjectClass *) klass;
+  GtkWidgetClass *widget_class = (GtkWidgetClass *) klass;
+  GParamSpec *param_spec;
+
+  object_class->finalize = live_search_finalize;
+  object_class->dispose = live_search_dispose;
+  object_class->get_property = live_search_get_property;
+  object_class->set_property = live_search_set_property;
+
+  widget_class->hide = live_search_hide;
+  widget_class->show = live_search_show;
+  widget_class->grab_focus = live_search_grab_focus;
+
+  param_spec = g_param_spec_object ("hook-widget", "Live Searchs Hook Widget",
+      "The live search catches key-press-events on this widget",
+      GTK_TYPE_WIDGET, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
+  g_object_class_install_property (object_class, PROP_HOOK_WIDGET,
+      param_spec);
+
+  param_spec = g_param_spec_string ("text", "Live Search Text",
+      "The text of the live search entry",
+      "", G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
+  g_object_class_install_property (object_class, PROP_TEXT, param_spec);
+
+  g_type_class_add_private (klass, sizeof (EmpathyLiveSearchPriv));
+}
+
+static void
+empathy_live_search_init (EmpathyLiveSearch *self)
+{
+  EmpathyLiveSearchPriv *priv =
+    G_TYPE_INSTANCE_GET_PRIVATE ((self), EMPATHY_TYPE_LIVE_SEARCH,
+        EmpathyLiveSearchPriv);
+
+  gtk_widget_set_no_show_all (GTK_WIDGET (self), TRUE);
+
+  priv->search_entry = gtk_entry_new ();
+  gtk_entry_set_icon_from_stock (GTK_ENTRY (priv->search_entry),
+      GTK_ENTRY_ICON_SECONDARY, GTK_STOCK_CLOSE);
+  gtk_entry_set_icon_activatable (GTK_ENTRY (priv->search_entry),
+      GTK_ENTRY_ICON_SECONDARY, TRUE);
+  gtk_entry_set_icon_sensitive (GTK_ENTRY (priv->search_entry),
+      GTK_ENTRY_ICON_SECONDARY, TRUE);
+  gtk_widget_show (priv->search_entry);
+
+  gtk_box_pack_start (GTK_BOX (self), priv->search_entry, TRUE, TRUE, 0);
+
+  g_signal_connect (priv->search_entry, "icon_release",
+      G_CALLBACK (live_search_close_pressed), self);
+  g_signal_connect (priv->search_entry, "changed",
+      G_CALLBACK (live_search_text_changed), self);
+  g_signal_connect (priv->search_entry, "key-press-event",
+      G_CALLBACK (live_search_entry_key_pressed_cb), self);
+
+  priv->hook_widget = NULL;
+
+  self->priv = priv;
+}
+
+GtkWidget *
+empathy_live_search_new (GtkWidget *hook)
+{
+  g_return_val_if_fail (hook == NULL || GTK_IS_WIDGET (hook), NULL);
+
+  return g_object_new (EMPATHY_TYPE_LIVE_SEARCH,
+      "hook-widget", hook,
+      NULL);
+}
+
+/* public methods */
+
+GtkWidget *
+empathy_live_search_get_hook_widget (EmpathyLiveSearch *self)
+{
+  EmpathyLiveSearchPriv *priv = GET_PRIV (self);
+
+  g_return_val_if_fail (EMPATHY_IS_LIVE_SEARCH (self), NULL);
+
+  return priv->hook_widget;
+}
+
+void
+empathy_live_search_set_hook_widget (EmpathyLiveSearch *self,
+    GtkWidget *hook)
+{
+  EmpathyLiveSearchPriv *priv;
+
+  g_return_if_fail (EMPATHY_IS_LIVE_SEARCH (self));
+  g_return_if_fail (hook == NULL || GTK_IS_WIDGET (hook));
+
+  priv = GET_PRIV (self);
+
+  /* release the actual widget */
+  live_search_release_hook_widget (self);
+
+  /* connect handlers if new source is not null */
+  if (hook != NULL)
+    {
+      priv->hook_widget = g_object_ref (hook);
+      g_signal_connect (priv->hook_widget, "key-press-event",
+          G_CALLBACK (live_search_key_press_event_cb),
+          self);
+      g_signal_connect (priv->hook_widget, "destroy",
+          G_CALLBACK (live_search_hook_widget_destroy_cb),
+          self);
+    }
+}
+
+const gchar *
+empathy_live_search_get_text (EmpathyLiveSearch *self)
+{
+  EmpathyLiveSearchPriv *priv = GET_PRIV (self);
+
+  g_return_val_if_fail (EMPATHY_IS_LIVE_SEARCH (self), NULL);
+
+  return gtk_entry_get_text (GTK_ENTRY (priv->search_entry));
+}
+
+void
+empathy_live_search_set_text (EmpathyLiveSearch *self,
+    const gchar *text)
+{
+  EmpathyLiveSearchPriv *priv = GET_PRIV (self);
+
+  g_return_if_fail (EMPATHY_IS_LIVE_SEARCH (self));
+  g_return_if_fail (text != NULL);
+
+  gtk_entry_set_text (GTK_ENTRY (priv->search_entry), text);
+}
+
+static gboolean
+live_search_match_string (const gchar *string,
+    const gunichar *prefix)
+{
+  const gchar *p;
+
+  if (prefix == NULL || prefix[0] == 0)
+    return TRUE;
+
+  if (EMP_STR_EMPTY (string))
+    return FALSE;
+
+  for (p = string; *p != '\0'; p = g_utf8_next_char (p))
+    {
+      guint i = 0;
+
+      /* Search the start of the word (skip non alpha-num chars) */
+      while (*p != '\0' && !g_unichar_isalnum (g_utf8_get_char (p)))
+        p = g_utf8_next_char (p);
+
+      /* Check if this word match prefix */
+      while (*p != '\0')
+        {
+          gunichar sc;
+
+          sc = stripped_char (g_utf8_get_char (p));
+          if (sc != 0)
+            {
+              /* If the char does not match, stop */
+              if (sc != prefix[i])
+                break;
+
+              /* The char matched. If it was the last of prefix, stop */
+              if (prefix[++i] == 0)
+                return TRUE;
+            }
+
+          p = g_utf8_next_char (p);
+        }
+
+      /* This word didn't match, go to next one (skip alpha-num chars) */
+      while (*p != '\0' && g_unichar_isalnum (g_utf8_get_char (p)))
+        p = g_utf8_next_char (p);
+
+      if (*p == '\0')
+        break;
+    }
+
+  return FALSE;
+}
+
+/**
+ * empathy_live_search_match:
+ * @self: a #EmpathyLiveSearch
+ * @string: a string where to search, must be valid UTF-8.
+ *
+ * Search if one of the words in @string string starts with the current text
+ * of @self.
+ *
+ * Searching for "aba" in "Abasto" will match, searching in "Moraba" will not,
+ * and searching in "A tool (abacus)" will do.
+ *
+ * The match is not case-sensitive, and regardless of the accentuation marks.
+ *
+ * Returns: %TRUE if a match is found, %FALSE otherwise.
+ *
+ **/
+gboolean
+empathy_live_search_match (EmpathyLiveSearch *self,
+    const gchar *string)
+{
+  EmpathyLiveSearchPriv *priv;
+
+  g_return_val_if_fail (EMPATHY_IS_LIVE_SEARCH (self), FALSE);
+
+  priv = GET_PRIV (self);
+
+  return live_search_match_string (string, priv->text_stripped);
+}
+
+gboolean
+empathy_live_search_match_string (const gchar *string,
+    const gchar *prefix)
+{
+  gunichar *stripped;
+  gboolean match;
+
+  stripped = strip_utf8_string (prefix);
+  match = live_search_match_string (string, stripped);
+  g_free (stripped);
+
+  return match;
+}
+
diff --git a/libempathy-gtk/empathy-live-search.h b/libempathy-gtk/empathy-live-search.h
new file mode 100644
index 0000000..108b42c
--- /dev/null
+++ b/libempathy-gtk/empathy-live-search.h
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2010 Collabora Ltd.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Authors: Felix Kaser <felix kaser collabora co uk>
+ */
+
+#ifndef __EMPATHY_LIVE_SEARCH_H__
+#define __EMPATHY_LIVE_SEARCH_H__
+
+#include <gtk/gtk.h>
+
+#include "empathy-contact-list-store.h"
+
+G_BEGIN_DECLS
+
+#define EMPATHY_TYPE_LIVE_SEARCH         (empathy_live_search_get_type ())
+#define EMPATHY_LIVE_SEARCH(o)           (G_TYPE_CHECK_INSTANCE_CAST ((o), EMPATHY_TYPE_LIVE_SEARCH, EmpathyLiveSearch))
+#define EMPATHY_LIVE_SEARCH_CLASS(k)     (G_TYPE_CHECK_CLASS_CAST ((k), EMPATHY_TYPE_LIVE_SEARCH, EmpathyLiveSearchClass))
+#define EMPATHY_IS_LIVE_SEARCH(o)        (G_TYPE_CHECK_INSTANCE_TYPE ((o), EMPATHY_TYPE_LIVE_SEARCH))
+#define EMPATHY_IS_LIVE_SEARCH_CLASS(k)  (G_TYPE_CHECK_CLASS_TYPE ((k), EMPATHY_TYPE_LIVE_SEARCH))
+#define EMPATHY_LIVE_SEARCH_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), EMPATHY_TYPE_LIVE_SEARCH, EmpathyLiveSearchClass))
+
+typedef struct _EmpathyLiveSearch      EmpathyLiveSearch;
+typedef struct _EmpathyLiveSearchClass EmpathyLiveSearchClass;
+
+struct _EmpathyLiveSearch {
+  GtkHBox parent;
+
+  /*<private>*/
+  gpointer priv;
+};
+
+struct _EmpathyLiveSearchClass {
+  GtkHBoxClass parent_class;
+};
+
+GType empathy_live_search_get_type (void) G_GNUC_CONST;
+GtkWidget *empathy_live_search_new (GtkWidget *hook);
+
+GtkWidget *empathy_live_search_get_hook_widget (EmpathyLiveSearch *self);
+void empathy_live_search_set_hook_widget (EmpathyLiveSearch *self,
+    GtkWidget *hook);
+
+const gchar *empathy_live_search_get_text (EmpathyLiveSearch *self);
+void empathy_live_search_set_text (EmpathyLiveSearch *self,
+    const gchar *text);
+
+gboolean empathy_live_search_match (EmpathyLiveSearch *self,
+    const gchar *string);
+
+/* Made public for unit tests */
+gboolean empathy_live_search_match_string (const gchar *string,
+   const gchar *prefix);
+
+G_END_DECLS
+
+#endif /* __EMPATHY_LIVE_SEARCH_H__ */
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