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tile.c

/*
 * This file is part of libtile.
 *
 * Copyright (c) 2006 Novell, Inc.
 *
 * Libtile 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 of the License, or (at your option)
 * any later version.
 *
 * Libtile 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 libslab; if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include "tile.h"

#include <gdk/gdkkeysyms.h>
#include <string.h>

#include "double-click-detector.h"

G_DEFINE_TYPE (Tile, tile, GTK_TYPE_BUTTON)

00030 typedef struct
{
      DoubleClickDetector *double_click_detector;
      
      gboolean is_dragging;
} TilePrivate;

static void tile_finalize (GObject *);
static void tile_get_property (GObject *, guint, GValue *, GParamSpec *);
static void tile_set_property (GObject *, guint, const GValue *, GParamSpec *);
static GObject *tile_constructor (GType, guint, GObjectConstructParam *);

static void tile_setup (Tile *);

static void tile_enter (GtkButton * widget);
static void tile_leave (GtkButton * widget);
static void tile_clicked (GtkButton *widget);

static gboolean tile_focus_in (GtkWidget *, GdkEventFocus *);
static gboolean tile_focus_out (GtkWidget *, GdkEventFocus *);
static gboolean tile_expose (GtkWidget *, GdkEventExpose *);
static gboolean tile_button_release (GtkWidget *, GdkEventButton *);
static gboolean tile_key_release (GtkWidget *, GdkEventKey *);
static gboolean tile_popup_menu (GtkWidget *);

static void tile_popup_menu_position (GtkMenu *, gint *, gint *, gboolean *, gpointer);

static void tile_drag_begin (GtkWidget *, GdkDragContext *);
static void tile_drag_data_get (GtkWidget *, GdkDragContext *, GtkSelectionData *, guint,
guint);

static void tile_emit_resource_event (Tile *, TileEventType, guint32);

static void tile_tile_action_triggered (Tile *, TileEvent *, TileAction *);
static void tile_action_triggered_event_marshal (GClosure *, GValue *, guint, const GValue *,
gpointer, gpointer);

typedef void (*marshal_func_VOID__POINTER_POINTER) (gpointer, gpointer, gpointer, gpointer);

#define TILE_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), TILE_TYPE, TilePrivate))

enum
{
      TILE_ACTIVATED_SIGNAL,
      TILE_IMPLICIT_ENABLE_SIGNAL,
      TILE_IMPLICIT_DISABLE_SIGNAL,
      TILE_ACTION_TRIGGERED_SIGNAL,
      LAST_SIGNAL
};

static guint tile_signals[LAST_SIGNAL] = { 0 };

enum
{
      PROP_0,
      PROP_TILE_URI,
      PROP_TILE_CONTEXT_MENU,
      PROP_TILE_ACTIONS
};

static void
tile_class_init (TileClass * this_class)
{
      GObjectClass *g_obj_class = G_OBJECT_CLASS (this_class);
      GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (this_class);
      GtkButtonClass *button_class = GTK_BUTTON_CLASS (this_class);

      g_obj_class->constructor = tile_constructor;
      g_obj_class->get_property = tile_get_property;
      g_obj_class->set_property = tile_set_property;
      g_obj_class->finalize = tile_finalize;

      widget_class->focus_in_event = tile_focus_in;
      widget_class->focus_out_event = tile_focus_out;
      widget_class->expose_event = tile_expose;
      widget_class->button_release_event = tile_button_release;
      widget_class->key_release_event = tile_key_release;
      widget_class->drag_begin = tile_drag_begin;
      widget_class->drag_data_get = tile_drag_data_get;
      widget_class->popup_menu = tile_popup_menu;

      button_class->enter = tile_enter;
      button_class->leave = tile_leave;
      button_class->clicked = tile_clicked;

      this_class->tile_explicit_enable = NULL;
      this_class->tile_explicit_disable = NULL;
      this_class->tile_activated = NULL;
      this_class->tile_implicit_enable = NULL;
      this_class->tile_implicit_disable = NULL;
      this_class->tile_action_triggered = tile_tile_action_triggered;

      g_type_class_add_private (this_class, sizeof (TilePrivate));

      g_object_class_install_property (g_obj_class, PROP_TILE_URI,
            g_param_spec_string ("tile-uri", "tile-uri", "the uri of the tile", NULL,
                  G_PARAM_READWRITE | G_PARAM_CONSTRUCT));

      g_object_class_install_property (g_obj_class, PROP_TILE_CONTEXT_MENU,
            g_param_spec_object ("context-menu", "context-menu",
                  "the context menu for the tile", GTK_TYPE_MENU, G_PARAM_READWRITE));

      tile_signals[TILE_ACTIVATED_SIGNAL] = g_signal_new ("tile-activated",
            G_TYPE_FROM_CLASS (this_class),
            G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
            G_STRUCT_OFFSET (TileClass, tile_activated),
            NULL, NULL, g_cclosure_marshal_VOID__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER);

      tile_signals[TILE_IMPLICIT_ENABLE_SIGNAL] = g_signal_new ("tile-implicit-enable",
            G_TYPE_FROM_CLASS (this_class),
            G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
            G_STRUCT_OFFSET (TileClass, tile_implicit_enable),
            NULL, NULL, g_cclosure_marshal_VOID__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER);

      tile_signals[TILE_IMPLICIT_DISABLE_SIGNAL] = g_signal_new ("tile-implicit-disable",
            G_TYPE_FROM_CLASS (this_class),
            G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
            G_STRUCT_OFFSET (TileClass, tile_implicit_disable),
            NULL, NULL, g_cclosure_marshal_VOID__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER);

      tile_signals[TILE_ACTION_TRIGGERED_SIGNAL] = g_signal_new ("tile-action-triggered",
            G_TYPE_FROM_CLASS (this_class),
            G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
            G_STRUCT_OFFSET (TileClass, tile_action_triggered),
            NULL, NULL, tile_action_triggered_event_marshal, G_TYPE_NONE, 2, G_TYPE_POINTER, G_TYPE_POINTER);
}

static GObject *
tile_constructor (GType type, guint n_param, GObjectConstructParam * param)
{
      GObject *g_obj;
      TilePrivate *priv;

      g_obj = (*G_OBJECT_CLASS (tile_parent_class)->constructor) (type, n_param, param);

      priv = TILE_GET_PRIVATE (g_obj);
      priv->double_click_detector = double_click_detector_new ();

      tile_setup (TILE (g_obj));

      return g_obj;
}

static void
tile_init (Tile * tile)
{
      TilePrivate *priv = TILE_GET_PRIVATE (tile);

      tile->uri = NULL;
      tile->context_menu = NULL;
      tile->entered = FALSE;
      tile->enabled = TRUE;

      tile->actions = NULL;
      tile->n_actions = 0;

      tile->default_action = NULL;

      priv->double_click_detector = NULL;
      priv->is_dragging = FALSE;
}

static void
tile_finalize (GObject * g_object)
{
      Tile *tile = TILE (g_object);
      TilePrivate *priv = TILE_GET_PRIVATE (g_object);

      if (tile->n_actions)    /* this will also free "default_action" entry */
      {
            gint x;
            for (x = 0; x < tile->n_actions; x++)
            {
                  if (tile->actions[x])
                        g_object_unref (tile->actions[x]);
            }
            g_free (tile->actions);
      }

      if (tile->uri)
            g_free (tile->uri);
      if (tile->context_menu)
            gtk_widget_destroy (GTK_WIDGET (tile->context_menu));

      g_object_unref (priv->double_click_detector);

      (*G_OBJECT_CLASS (tile_parent_class)->finalize) (g_object);
}

static void
tile_get_property (GObject * g_obj, guint prop_id, GValue * value, GParamSpec * param_spec)
{
      if (!IS_TILE (g_obj))
            return;

      switch (prop_id)
      {
      case PROP_TILE_URI:
            g_value_set_string (value, TILE (g_obj)->uri);
            break;

      case PROP_TILE_CONTEXT_MENU:
            g_value_set_object (value, TILE (g_obj)->context_menu);
            break;

      default:
            break;
      }
}

static void
tile_set_property (GObject * g_obj, guint prop_id, const GValue * value, GParamSpec * param_spec)
{
      Tile *tile;
      GtkMenu *menu;

      if (!IS_TILE (g_obj))
            return;

      tile = TILE (g_obj);

      switch (prop_id)
      {
      case PROP_TILE_URI:
            tile->uri = g_strdup (g_value_get_string (value));
            break;

      case PROP_TILE_CONTEXT_MENU:
            menu = g_value_get_object (value);

            if (menu == tile->context_menu)
                  break;

            if (tile->context_menu)
                  gtk_menu_detach (tile->context_menu);

            tile->context_menu = menu;

            if (tile->context_menu)
                  gtk_menu_attach_to_widget (tile->context_menu, GTK_WIDGET (tile), NULL);

            break;

      default:
            break;
      }
}

static void
tile_setup (Tile * tile)
{
      gtk_button_set_relief (GTK_BUTTON (tile), GTK_RELIEF_NONE);

      if (tile->uri)
      {
            gtk_drag_source_set (GTK_WIDGET (tile), GDK_BUTTON1_MASK, NULL, 0,
                  GDK_ACTION_COPY | GDK_ACTION_MOVE);

            gtk_drag_source_add_uri_targets (GTK_WIDGET (tile));
      }
}

static void
tile_enter (GtkButton * widget)
{
      gtk_widget_set_state (GTK_WIDGET (widget), TILE_STATE_ENTERED);

      TILE (widget)->entered = TRUE;
}

static void
tile_leave (GtkButton * widget)
{
      if (GTK_WIDGET_HAS_FOCUS (widget))
            gtk_widget_set_state (GTK_WIDGET (widget), TILE_STATE_FOCUSED);
      else
            gtk_widget_set_state (GTK_WIDGET (widget), GTK_STATE_NORMAL);

      TILE (widget)->entered = FALSE;
}

static void
tile_clicked (GtkButton * widget)
{
      TileEvent *tile_event;

      tile_event = g_new0 (TileEvent, 1);
      tile_event->type = TILE_EVENT_ACTIVATED_DOUBLE_CLICK;
      tile_event->time = gtk_get_current_event_time ();

      g_signal_emit (widget, tile_signals[TILE_ACTIVATED_SIGNAL], 0, tile_event);

      gtk_button_released (widget);
      g_free (tile_event);
}

static gboolean
tile_focus_in (GtkWidget * widget, GdkEventFocus * event)
{
      gtk_widget_set_state (widget, TILE_STATE_FOCUSED);

      return FALSE;
}

static gboolean
tile_focus_out (GtkWidget * widget, GdkEventFocus * event)
{
      if (TILE (widget)->entered)
            gtk_widget_set_state (widget, TILE_STATE_ENTERED);
      else
            gtk_widget_set_state (widget, GTK_STATE_NORMAL);

      return FALSE;
}

static gboolean
tile_expose (GtkWidget * widget, GdkEventExpose * event)
{
      /* FIXME: there ought to be a better way to prevent the focus from being rendered. */

      gboolean has_focus;
      gboolean retval;

      if ((has_focus = GTK_WIDGET_HAS_FOCUS (widget)))
            GTK_WIDGET_UNSET_FLAGS (widget, GTK_HAS_FOCUS);

      retval = (*GTK_WIDGET_CLASS (tile_parent_class)->expose_event) (widget, event);

      if (has_focus)
            GTK_WIDGET_SET_FLAGS (widget, GTK_HAS_FOCUS);

      return retval;
}

static gboolean
tile_button_release (GtkWidget * widget, GdkEventButton * event)
{
      Tile *tile = TILE (widget);
      TilePrivate *priv = TILE_GET_PRIVATE (tile);

      TileEvent *tile_event;

      if (priv->is_dragging)
      {
            priv->is_dragging = FALSE;

            return TRUE;
      }

      switch (event->button)
      {
      case 1:
            tile_event = g_new0 (TileEvent, 1);
            tile_event->time = event->time;

            if (double_click_detector_is_double_click (priv->double_click_detector, event->time,
                        TRUE))
                  tile_event->type = TILE_EVENT_ACTIVATED_DOUBLE_CLICK;
            else
                  tile_event->type = TILE_EVENT_ACTIVATED_SINGLE_CLICK;

            g_signal_emit (tile, tile_signals[TILE_ACTIVATED_SIGNAL], 0, tile_event);

            gtk_button_released (GTK_BUTTON (widget));
            g_free (tile_event);

            break;

      case 3:
            if (GTK_IS_MENU (tile->context_menu))
                  gtk_menu_popup (tile->context_menu, NULL, NULL, NULL, NULL, event->button,
                        event->time);

            break;

      default:
            break;
      }

      return TRUE;
}

static gboolean
tile_key_release (GtkWidget * widget, GdkEventKey * event)
{
      TileEvent *tile_event;

      if (event->keyval == GDK_Return)
      {
            tile_event = g_new0 (TileEvent, 1);
            tile_event->type = TILE_EVENT_ACTIVATED_KEYBOARD;
            tile_event->time = event->time;

            g_signal_emit (widget, tile_signals[TILE_ACTIVATED_SIGNAL], 0, tile_event);

            return TRUE;
      }

      return FALSE;
}

static void
tile_popup_menu_position (GtkMenu * menu, gint * x, gint * y, gboolean * push_in, gpointer data)
{
      Tile *tile = TILE (data);

      GtkRequisition req;
      GtkWidget *top;

      if (!GTK_WIDGET_REALIZED (tile))
            return;

      gtk_widget_size_request (GTK_WIDGET (menu), &req);

      top = gtk_widget_get_toplevel (GTK_WIDGET (tile));

      gdk_window_get_origin (top->window, x, y);

      *x += (top->allocation.width / 2) - (req.width / 2);
      *y += (top->allocation.height / 2) - (req.height / 2);

      *push_in = FALSE;
}

static gboolean
tile_popup_menu (GtkWidget * widget)
{
      Tile *tile = TILE (widget);

      if (GTK_IS_MENU (tile->context_menu))
      {
            gtk_menu_popup (tile->context_menu, NULL, NULL, tile_popup_menu_position, tile, 0,
                  gtk_get_current_event_time ());

            return TRUE;
      }

      else
            return FALSE;
}

static void
tile_drag_begin (GtkWidget * widget, GdkDragContext * context)
{
      TILE_GET_PRIVATE (widget)->is_dragging = TRUE;
}

static void
tile_drag_data_get (GtkWidget * widget, GdkDragContext * context, GtkSelectionData * data,
      guint info, guint time)
{
      gchar *uris[2];

      if (TILE (widget)->uri)
      {
            uris[0] = TILE (widget)->uri;
            uris[1] = NULL;

            gtk_selection_data_set_uris (data, uris);
      }
}

static void
tile_tile_action_triggered (Tile * tile, TileEvent * event, TileAction * action)
{
      if (action && action->func)
            (*action->func) (tile, event, action);
}

gint
tile_compare (gconstpointer a, gconstpointer b)
{
      if (IS_TILE (a) && IS_TILE (b))
            return strcmp (TILE (a)->uri, TILE (b)->uri);

      return a - b;
}

void
tile_explicit_enable (Tile * this)
{
      TileClass *this_class = TILE_GET_CLASS (this);

      if (this_class->tile_explicit_enable)
            (*this_class->tile_explicit_enable) (this);
}

void
tile_explicit_disable (Tile * this)
{
      TileClass *this_class = TILE_GET_CLASS (this);

      if (this_class->tile_explicit_disable)
            (*this_class->tile_explicit_disable) (this);
}

void
tile_implicit_enable (Tile * tile)
{
      tile_implicit_enable_with_time (tile, GDK_CURRENT_TIME);
}

void
tile_implicit_disable (Tile * tile)
{
      tile_implicit_disable_with_time (tile, GDK_CURRENT_TIME);
}

void
tile_implicit_enable_with_time (Tile * tile, guint32 time)
{
      tile_emit_resource_event (tile, TILE_EVENT_IMPLICIT_ENABLE, time);
}

void
tile_implicit_disable_with_time (Tile * tile, guint32 time)
{
      tile_emit_resource_event (tile, TILE_EVENT_IMPLICIT_DISABLE, time);
}

static void
tile_emit_resource_event (Tile * tile, TileEventType type, guint32 time)
{
      TileEvent *event;
      guint signal_id;

      event = g_new0 (TileEvent, 1);
      event->type = type;
      event->time = time;

      if (type == TILE_EVENT_IMPLICIT_ENABLE)
      {
            signal_id = tile_signals[TILE_IMPLICIT_ENABLE_SIGNAL];
            tile->enabled = TRUE;
      }
      else
      {
            signal_id = tile_signals[TILE_IMPLICIT_DISABLE_SIGNAL];
            tile->enabled = FALSE;
      }

      g_signal_emit (tile, signal_id, 0, event);
      g_free (event);
}

void
tile_trigger_action (Tile * tile, TileAction * action)
{
      tile_trigger_action_with_time (tile, action, GDK_CURRENT_TIME);
}

void
tile_trigger_action_with_time (Tile * tile, TileAction * action, guint32 time)
{
      TileEvent *event = g_new0 (TileEvent, 1);

      event->type = TILE_EVENT_ACTION_TRIGGERED;
      event->time = time;

      g_signal_emit (tile, tile_signals[TILE_ACTION_TRIGGERED_SIGNAL], 0, event, action);
      g_free (event);
}

static void
tile_action_triggered_event_marshal (GClosure * closure, GValue * retval, guint n_param,
      const GValue * param, gpointer invocation_hint, gpointer marshal_data)
{
      marshal_func_VOID__POINTER_POINTER callback;
      GCClosure *cc = (GCClosure *) closure;
      gpointer data_0, data_1;

      g_return_if_fail (n_param == 3);

      if (G_CCLOSURE_SWAP_DATA (closure))
      {
            data_0 = closure->data;
            data_1 = g_value_peek_pointer (param);
      }
      else
      {
            data_0 = g_value_peek_pointer (param);
            data_1 = closure->data;
      }

      if (marshal_data)
            callback = (marshal_func_VOID__POINTER_POINTER) marshal_data;
      else
            callback = (marshal_func_VOID__POINTER_POINTER) cc->callback;

      callback (data_0, g_value_peek_pointer (param + 1), g_value_peek_pointer (param + 2),
            data_1);
}

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