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/* GTK - The GIMP Toolkit
* gtklinkbutton.c - an hyperlink-enabled button
*
* Copyright (C) 2006 Emmanuele Bassi <ebassi@gmail.com>
* All rights reserved.
*
* Based on gnome-href code by:
* James Henstridge <james@daa.com.au>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Cambridge, MA 02139, USA.
*/

/**
* SECTION:gtklinkbutton
* @Title: GtkLinkButton
* @Short_description: Create buttons bound to a URL
* @See_also: #GtkButton
*
* A GtkLinkButton is a #GtkButton with a hyperlink, similar to the one
* used by web browsers, which triggers an action when clicked. It is useful
* to show quick links to resources.
*
* A link button is created by calling either gtk_link_button_new() or
* gtk_link_button_new_with_label(). If using the former, the URI you pass
* to the constructor is used as a label for the widget.
*
* The URI bound to a GtkLinkButton can be set specifically using
* gtk_link_button_set_uri(), and retrieved using gtk_link_button_get_uri().
*
* By default, GtkLinkButton calls gtk_show_uri() when the button is
* clicked. This behaviour can be overridden by connecting to the
* #GtkLinkButton::activate-link signal and returning %TRUE from the
* signal handler.
*/

#include "config.h"

#include "gtklinkbutton.h"

#include <string.h>

#include "gtkclipboard.h"
#include "gtkdnd.h"
#include "gtkimagemenuitem.h"
#include "gtklabel.h"
#include "gtkmainprivate.h"
#include "gtkmarshalers.h"
#include "gtkmenu.h"
#include "gtkmenuitem.h"
#include "gtksizerequest.h"
#include "gtkstock.h"
#include "gtkshow.h"
#include "gtktooltip.h"
#include "gtkintl.h"

#include "a11y/gtklinkbuttonaccessible.h"

struct _GtkLinkButtonPrivate
{
  gchar *uri;

  gboolean visited;

  GtkWidget *popup_menu;
};

enum
{
  PROP_0,
  PROP_URI,
  PROP_VISITED
};

enum
{
  ACTIVATE_LINK,

  LAST_SIGNAL
};

static void gtk_link_button_finalize (GObject *object);
static void gtk_link_button_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void gtk_link_button_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_link_button_add (GtkContainer *container,
GtkWidget *widget);
static gboolean gtk_link_button_button_press (GtkWidget *widget,
GdkEventButton *event);
static void gtk_link_button_clicked (GtkButton *button);
static gboolean gtk_link_button_popup_menu (GtkWidget *widget);
static void gtk_link_button_style_updated (GtkWidget *widget);
static gboolean gtk_link_button_enter_cb (GtkWidget *widget,
GdkEventCrossing *event,
gpointer user_data);
static gboolean gtk_link_button_leave_cb (GtkWidget *widget,
GdkEventCrossing *event,
gpointer user_data);
static void gtk_link_button_drag_data_get_cb (GtkWidget *widget,
GdkDragContext *context,
GtkSelectionData *selection,
guint _info,
guint _time,
gpointer user_data);
static gboolean gtk_link_button_query_tooltip_cb (GtkWidget *widget,
                                                  gint x,
                                                  gint y,
                                                  gboolean keyboard_tip,
                                                  GtkTooltip *tooltip,
                                                  gpointer data);
static gboolean gtk_link_button_activate_link (GtkLinkButton *link_button);

static const GtkTargetEntry link_drop_types[] = {
  { "text/uri-list", 0, 0 },
  { "_NETSCAPE_URL", 0, 0 }
};

static const GdkColor default_link_color = { 0, 0, 0, 0xeeee };
static const GdkColor default_visited_link_color = { 0, 0x5555, 0x1a1a, 0x8b8b };

static guint link_signals[LAST_SIGNAL] = { 0, };

G_DEFINE_TYPE (GtkLinkButton, gtk_link_button, GTK_TYPE_BUTTON)

static void
gtk_link_button_class_init (GtkLinkButtonClass *klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
  GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
  GtkButtonClass *button_class = GTK_BUTTON_CLASS (klass);
  
  gobject_class->set_property = gtk_link_button_set_property;
  gobject_class->get_property = gtk_link_button_get_property;
  gobject_class->finalize = gtk_link_button_finalize;
  
  widget_class->button_press_event = gtk_link_button_button_press;
  widget_class->popup_menu = gtk_link_button_popup_menu;
  widget_class->style_updated = gtk_link_button_style_updated;
  
  container_class->add = gtk_link_button_add;

  button_class->clicked = gtk_link_button_clicked;

  klass->activate_link = gtk_link_button_activate_link;

  /**
* GtkLinkButton:uri
*
* The URI bound to this button.
*
* Since: 2.10
*/
  g_object_class_install_property (gobject_class,
   PROP_URI,
   g_param_spec_string ("uri",
   P_("URI"),
   P_("The URI bound to this button"),
   NULL,
   G_PARAM_READWRITE));
  /**
* GtkLinkButton:visited
*
* The 'visited' state of this button. A visited link is drawn in a
* different color.
*
* Since: 2.14
*/
  g_object_class_install_property (gobject_class,
   PROP_VISITED,
   g_param_spec_boolean ("visited",
                                                         P_("Visited"),
                                                         P_("Whether this link has been visited."),
                                                         FALSE,
                                                         G_PARAM_READWRITE));
  
  g_type_class_add_private (gobject_class, sizeof (GtkLinkButtonPrivate));

  /**
* GtkLinkButton::activate-link:
* @button: the #GtkLinkButton that emitted the signal
*
* The ::activate-link signal is emitted each time the #GtkLinkButton
* has been clicked.
*
* The default handler will call gtk_show_uri() with the URI stored inside
* the #GtkLinkButton:uri property.
*
* To override the default behavior, you can connect to the ::activate-link
* signal and stop the propagation of the signal by returning %TRUE from
* your handler.
*/
  link_signals[ACTIVATE_LINK] =
    g_signal_new (I_("activate-link"),
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (GtkLinkButtonClass, activate_link),
                  _gtk_boolean_handled_accumulator, NULL,
                  _gtk_marshal_BOOLEAN__VOID,
                  G_TYPE_BOOLEAN, 0);

  gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_LINK_BUTTON_ACCESSIBLE);
}

static void
gtk_link_button_init (GtkLinkButton *link_button)
{
  link_button->priv = G_TYPE_INSTANCE_GET_PRIVATE (link_button,
                                                   GTK_TYPE_LINK_BUTTON,
                                                   GtkLinkButtonPrivate);

  gtk_button_set_relief (GTK_BUTTON (link_button), GTK_RELIEF_NONE);
  
  g_signal_connect (link_button, "enter-notify-event",
   G_CALLBACK (gtk_link_button_enter_cb), NULL);
  g_signal_connect (link_button, "leave-notify-event",
   G_CALLBACK (gtk_link_button_leave_cb), NULL);
  g_signal_connect (link_button, "drag-data-get",
   G_CALLBACK (gtk_link_button_drag_data_get_cb), NULL);

  g_object_set (link_button, "has-tooltip", TRUE, NULL);
  g_signal_connect (link_button, "query-tooltip",
                    G_CALLBACK (gtk_link_button_query_tooltip_cb), NULL);
  
  /* enable drag source */
  gtk_drag_source_set (GTK_WIDGET (link_button),
   GDK_BUTTON1_MASK,
   link_drop_types, G_N_ELEMENTS (link_drop_types),
   GDK_ACTION_COPY);
}

static void
gtk_link_button_finalize (GObject *object)
{
  GtkLinkButton *link_button = GTK_LINK_BUTTON (object);
  
  g_free (link_button->priv->uri);
  
  G_OBJECT_CLASS (gtk_link_button_parent_class)->finalize (object);
}

static void
gtk_link_button_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
  GtkLinkButton *link_button = GTK_LINK_BUTTON (object);
  
  switch (prop_id)
    {
    case PROP_URI:
      g_value_set_string (value, link_button->priv->uri);
      break;
    case PROP_VISITED:
      g_value_set_boolean (value, link_button->priv->visited);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
gtk_link_button_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
  GtkLinkButton *link_button = GTK_LINK_BUTTON (object);
  
  switch (prop_id)
    {
    case PROP_URI:
      gtk_link_button_set_uri (link_button, g_value_get_string (value));
      break;
    case PROP_VISITED:
      gtk_link_button_set_visited (link_button, g_value_get_boolean (value));
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
set_link_color (GtkLinkButton *link_button)
{
  GdkColor *link_color = NULL;
  GtkWidget *label;

  label = gtk_bin_get_child (GTK_BIN (link_button));
  if (!GTK_IS_LABEL (label))
    return;

  if (link_button->priv->visited)
    {
      gtk_widget_style_get (GTK_WIDGET (link_button),
"visited-link-color", &link_color, NULL);
      if (!link_color)
link_color = (GdkColor *) &default_visited_link_color;
    }
  else
    {
      gtk_widget_style_get (GTK_WIDGET (link_button),
"link-color", &link_color, NULL);
      if (!link_color)
link_color = (GdkColor *) &default_link_color;
    }

  gtk_widget_modify_fg (label, GTK_STATE_NORMAL, link_color);
  gtk_widget_modify_fg (label, GTK_STATE_ACTIVE, link_color);
  gtk_widget_modify_fg (label, GTK_STATE_PRELIGHT, link_color);
  gtk_widget_modify_fg (label, GTK_STATE_SELECTED, link_color);

  if (link_color != &default_link_color &&
      link_color != &default_visited_link_color)
    gdk_color_free (link_color);
}

static void
set_link_underline (GtkLinkButton *link_button)
{
  GtkWidget *label;
  
  label = gtk_bin_get_child (GTK_BIN (link_button));
  if (GTK_IS_LABEL (label))
    {
      PangoAttrList *attributes;
      PangoAttribute *uline;

      uline = pango_attr_underline_new (PANGO_UNDERLINE_SINGLE);
      uline->start_index = 0;
      uline->end_index = G_MAXUINT;
      attributes = pango_attr_list_new ();
      pango_attr_list_insert (attributes, uline);
      gtk_label_set_attributes (GTK_LABEL (label), attributes);
      pango_attr_list_unref (attributes);
    }
}

static void
gtk_link_button_add (GtkContainer *container,
GtkWidget *widget)
{
  GTK_CONTAINER_CLASS (gtk_link_button_parent_class)->add (container, widget);

  set_link_color (GTK_LINK_BUTTON (container));
  set_link_underline (GTK_LINK_BUTTON (container));
}

static void
gtk_link_button_style_updated (GtkWidget *widget)
{
  GTK_WIDGET_CLASS (gtk_link_button_parent_class)->style_updated (widget);

  set_link_color (GTK_LINK_BUTTON (widget));
}

static void
set_hand_cursor (GtkWidget *widget,
gboolean show_hand)
{
  GdkDisplay *display;
  GdkCursor *cursor;

  display = gtk_widget_get_display (widget);

  cursor = NULL;
  if (show_hand)
    cursor = gdk_cursor_new_for_display (display, GDK_HAND2);

  gdk_window_set_cursor (gtk_widget_get_window (widget), cursor);
  gdk_display_flush (display);

  if (cursor)
    g_object_unref (cursor);
}

static void
popup_menu_detach (GtkWidget *attach_widget,
GtkMenu *menu)
{
  GtkLinkButton *link_button = GTK_LINK_BUTTON (attach_widget);

  link_button->priv->popup_menu = NULL;
}

static void
popup_position_func (GtkMenu *menu,
gint *x,
gint *y,
gboolean *push_in,
gpointer user_data)
{
  GtkLinkButton *link_button = GTK_LINK_BUTTON (user_data);
  GtkLinkButtonPrivate *priv = link_button->priv;
  GtkAllocation allocation;
  GtkWidget *widget = GTK_WIDGET (link_button);
  GdkScreen *screen = gtk_widget_get_screen (widget);
  GtkRequisition req;
  gint monitor_num;
  GdkRectangle monitor;
  
  g_return_if_fail (gtk_widget_get_realized (widget));

  gdk_window_get_origin (gtk_widget_get_window (widget), x, y);

  gtk_widget_get_preferred_size (priv->popup_menu, &req, NULL);

  gtk_widget_get_allocation (widget, &allocation);
  *x += allocation.width / 2;
  *y += allocation.height;

  monitor_num = gdk_screen_get_monitor_at_point (screen, *x, *y);
  gtk_menu_set_monitor (menu, monitor_num);
  gdk_screen_get_monitor_geometry (screen, monitor_num, &monitor);

  *x = CLAMP (*x, monitor.x, monitor.x + MAX (0, monitor.width - req.width));
  *y = CLAMP (*y, monitor.y, monitor.y + MAX (0, monitor.height - req.height));

  *push_in = FALSE;
}

static void
copy_activate_cb (GtkWidget *widget,
GtkLinkButton *link_button)
{
  GtkLinkButtonPrivate *priv = link_button->priv;
  
  gtk_clipboard_set_text (gtk_widget_get_clipboard (GTK_WIDGET (link_button),
GDK_SELECTION_CLIPBOARD),
priv->uri, -1);
}

static void
gtk_link_button_do_popup (GtkLinkButton *link_button,
GdkEventButton *event)
{
  GtkLinkButtonPrivate *priv = link_button->priv;
  gint button;
  guint time;
  
  if (event)
    {
      button = event->button;
      time = event->time;
    }
  else
    {
      button = 0;
      time = gtk_get_current_event_time ();
    }

  if (gtk_widget_get_realized (GTK_WIDGET (link_button)))
    {
      GtkWidget *menu_item;
      
      if (priv->popup_menu)
gtk_widget_destroy (priv->popup_menu);

      priv->popup_menu = gtk_menu_new ();
      
      gtk_menu_attach_to_widget (GTK_MENU (priv->popup_menu),
GTK_WIDGET (link_button),
popup_menu_detach);

      menu_item = gtk_image_menu_item_new_with_mnemonic (_("Copy URL"));
      gtk_image_menu_item_set_image (GTK_IMAGE_MENU_ITEM (menu_item),
gtk_image_new_from_stock (GTK_STOCK_COPY,
GTK_ICON_SIZE_MENU));
      g_signal_connect (menu_item, "activate",
G_CALLBACK (copy_activate_cb), link_button);
      gtk_widget_show (menu_item);
      gtk_menu_shell_append (GTK_MENU_SHELL (priv->popup_menu), menu_item);
      
      if (button)
        gtk_menu_popup (GTK_MENU (priv->popup_menu), NULL, NULL,
NULL, NULL,
button, time);
      else
        {
          gtk_menu_popup (GTK_MENU (priv->popup_menu), NULL, NULL,
popup_position_func, link_button,
button, time);
gtk_menu_shell_select_first (GTK_MENU_SHELL (priv->popup_menu), FALSE);
}
    }
}

static gboolean
gtk_link_button_button_press (GtkWidget *widget,
GdkEventButton *event)
{
  if (!gtk_widget_has_focus (widget))
    gtk_widget_grab_focus (widget);

  if ((event->button == 3) && (event->type == GDK_BUTTON_PRESS))
    {
      gtk_link_button_do_popup (GTK_LINK_BUTTON (widget), event);
      
      return TRUE;
    }

  if (GTK_WIDGET_CLASS (gtk_link_button_parent_class)->button_press_event)
    return GTK_WIDGET_CLASS (gtk_link_button_parent_class)->button_press_event (widget, event);
  
  return FALSE;
}

static gboolean
gtk_link_button_activate_link (GtkLinkButton *link_button)
{
  GdkScreen *screen;
  GError *error;

  if (gtk_widget_has_screen (GTK_WIDGET (link_button)))
    screen = gtk_widget_get_screen (GTK_WIDGET (link_button));
  else
    screen = NULL;

  error = NULL;
  gtk_show_uri (screen, link_button->priv->uri, GDK_CURRENT_TIME, &error);
  if (error)
    {
      g_warning ("Unable to show '%s': %s",
                 link_button->priv->uri,
                 error->message);
      g_error_free (error);

      return FALSE;
    }

  gtk_link_button_set_visited (link_button, TRUE);

  return TRUE;
}

static void
gtk_link_button_clicked (GtkButton *button)
{
  gboolean retval = FALSE;

  g_signal_emit (button, link_signals[ACTIVATE_LINK], 0, &retval);
}

static gboolean
gtk_link_button_popup_menu (GtkWidget *widget)
{
  gtk_link_button_do_popup (GTK_LINK_BUTTON (widget), NULL);

  return TRUE;
}

static gboolean
gtk_link_button_enter_cb (GtkWidget *widget,
GdkEventCrossing *crossing,
gpointer user_data)
{
  set_hand_cursor (widget, TRUE);
  
  return FALSE;
}

static gboolean
gtk_link_button_leave_cb (GtkWidget *widget,
GdkEventCrossing *crossing,
gpointer user_data)
{
  set_hand_cursor (widget, FALSE);
  
  return FALSE;
}

static void
gtk_link_button_drag_data_get_cb (GtkWidget *widget,
GdkDragContext *context,
GtkSelectionData *selection,
guint _info,
guint _time,
gpointer user_data)
{
  GtkLinkButton *link_button = GTK_LINK_BUTTON (widget);
  gchar *uri;
  
  uri = g_strdup_printf ("%s\r\n", link_button->priv->uri);
  gtk_selection_data_set (selection,
                          gtk_selection_data_get_target (selection),
   8,
   (guchar *) uri,
strlen (uri));
  
  g_free (uri);
}

/**
* gtk_link_button_new:
* @uri: a valid URI
*
* Creates a new #GtkLinkButton with the URI as its text.
*
* Return value: a new link button widget.
*
* Since: 2.10
*/
GtkWidget *
gtk_link_button_new (const gchar *uri)
{
  gchar *utf8_uri = NULL;
  GtkWidget *retval;
  
  g_return_val_if_fail (uri != NULL, NULL);
  
  if (g_utf8_validate (uri, -1, NULL))
    {
      utf8_uri = g_strdup (uri);
    }
  else
    {
      GError *conv_err = NULL;
    
      utf8_uri = g_locale_to_utf8 (uri, -1, NULL, NULL, &conv_err);
      if (conv_err)
        {
          g_warning ("Attempting to convert URI `%s' to UTF-8, but failed "
                     "with error: %s\n",
                     uri,
                     conv_err->message);
          g_error_free (conv_err);
        
          utf8_uri = g_strdup (_("Invalid URI"));
        }
    }
  
  retval = g_object_new (GTK_TYPE_LINK_BUTTON,
   "label", utf8_uri,
   "uri", uri,
   NULL);
  
  g_free (utf8_uri);
  
  return retval;
}

/**
* gtk_link_button_new_with_label:
* @uri: a valid URI
* @label: (allow-none): the text of the button
*
* Creates a new #GtkLinkButton containing a label.
*
* Return value: (transfer none): a new link button widget.
*
* Since: 2.10
*/
GtkWidget *
gtk_link_button_new_with_label (const gchar *uri,
const gchar *label)
{
  GtkWidget *retval;
  
  g_return_val_if_fail (uri != NULL, NULL);
  
  if (!label)
    return gtk_link_button_new (uri);

  retval = g_object_new (GTK_TYPE_LINK_BUTTON,
"label", label,
"uri", uri,
NULL);

  return retval;
}

static gboolean
gtk_link_button_query_tooltip_cb (GtkWidget *widget,
                                  gint x,
                                  gint y,
                                  gboolean keyboard_tip,
                                  GtkTooltip *tooltip,
                                  gpointer data)
{
  GtkLinkButton *link_button = GTK_LINK_BUTTON (widget);
  const gchar *label, *uri;

  label = gtk_button_get_label (GTK_BUTTON (link_button));
  uri = link_button->priv->uri;

  if (!gtk_widget_get_tooltip_text (widget)
    && !gtk_widget_get_tooltip_markup (widget)
    && label && *label != '\0' && uri && strcmp (label, uri) != 0)
    {
      gtk_tooltip_set_text (tooltip, uri);
      return TRUE;
    }

  return FALSE;
}


/**
* gtk_link_button_set_uri:
* @link_button: a #GtkLinkButton
* @uri: a valid URI
*
* Sets @uri as the URI where the #GtkLinkButton points. As a side-effect
* this unsets the 'visited' state of the button.
*
* Since: 2.10
*/
void
gtk_link_button_set_uri (GtkLinkButton *link_button,
const gchar *uri)
{
  GtkLinkButtonPrivate *priv;

  g_return_if_fail (GTK_IS_LINK_BUTTON (link_button));
  g_return_if_fail (uri != NULL);

  priv = link_button->priv;

  g_free (priv->uri);
  priv->uri = g_strdup (uri);

  g_object_notify (G_OBJECT (link_button), "uri");

  gtk_link_button_set_visited (link_button, FALSE);
}

/**
* gtk_link_button_get_uri:
* @link_button: a #GtkLinkButton
*
* Retrieves the URI set using gtk_link_button_set_uri().
*
* Return value: a valid URI. The returned string is owned by the link button
* and should not be modified or freed.
*
* Since: 2.10
*/
const gchar *
gtk_link_button_get_uri (GtkLinkButton *link_button)
{
  g_return_val_if_fail (GTK_IS_LINK_BUTTON (link_button), NULL);
  
  return link_button->priv->uri;
}

/**
* gtk_link_button_set_visited:
* @link_button: a #GtkLinkButton
* @visited: the new 'visited' state
*
* Sets the 'visited' state of the URI where the #GtkLinkButton
* points. See gtk_link_button_get_visited() for more details.
*
* Since: 2.14
*/
void
gtk_link_button_set_visited (GtkLinkButton *link_button,
                             gboolean visited)
{
  g_return_if_fail (GTK_IS_LINK_BUTTON (link_button));

  visited = visited != FALSE;

  if (link_button->priv->visited != visited)
    {
      link_button->priv->visited = visited;

      set_link_color (link_button);

      g_object_notify (G_OBJECT (link_button), "visited");
    }
}

/**
* gtk_link_button_get_visited:
* @link_button: a #GtkLinkButton
*
* Retrieves the 'visited' state of the URI where the #GtkLinkButton
* points. The button becomes visited when it is clicked. If the URI
* is changed on the button, the 'visited' state is unset again.
*
* The state may also be changed using gtk_link_button_set_visited().
*
* Return value: %TRUE if the link has been visited, %FALSE otherwise
*
* Since: 2.14
*/
gboolean
gtk_link_button_get_visited (GtkLinkButton *link_button)
{
  g_return_val_if_fail (GTK_IS_LINK_BUTTON (link_button), FALSE);
  
  return link_button->priv->visited;
}
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