/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */

/* eel-image-table.c - An image table.

   Copyright (C) 2000 Eazel, Inc.

   The Gnome 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.

   The Gnome 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 the Gnome Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.

   Authors: Ramiro Estrugo <ramiro@eazel.com>
*/

#include <config.h>
#include "eel-image-table.h"

#include "eel-art-extensions.h"
#include "eel-art-gtk-extensions.h"
#include "eel-debug-drawing.h"
#include "eel-gtk-extensions.h"
#include "eel-gtk-macros.h"
#include "eel-labeled-image.h"
#include "eel-marshal.h"
#include <gtk/gtk.h>

/* Arguments */
enum
{
	ARG_0,
	ARG_CHILD_UNDER_POINTER
};

/* Detail member struct */
struct EelImageTableDetails
{
	GtkWidget *child_under_pointer;
	GtkWidget *child_being_pressed;
	GdkGC     *clear_gc;
};

/* Signals */
typedef enum
{
	CHILD_ENTER,
	CHILD_LEAVE,
	CHILD_PRESSED,
	CHILD_RELEASED,
	CHILD_CLICKED,
	LAST_SIGNAL
} ImageTableSignals;

/* Signals */
static guint image_table_signals[LAST_SIGNAL] = { 0 };

static void    eel_image_table_class_init     (EelImageTableClass *image_table_class);
static void    eel_image_table_init           (EelImageTable      *image);

/* GObjectClass methods */
static void    eel_image_table_finalize             (GObject            *object);

/* GtkWidgetClass methods */
static void    eel_image_table_realize              (GtkWidget          *widget);
static void    eel_image_table_unrealize            (GtkWidget          *widget);

/* GtkContainerClass methods */
static void    eel_image_table_remove               (GtkContainer       *container,
						     GtkWidget          *widget);
static GType   eel_image_table_child_type           (GtkContainer       *container);

/* Private EelImageTable methods */
static void    image_table_emit_signal              (EelImageTable      *image_table,
						     GtkWidget          *child,
						     guint               signal_index,
						     int                 x,
						     int                 y,
						     int                 button,
						     guint               state,
						     GdkEvent           *event);

/* Ancestor callbacks */
static int     ancestor_enter_notify_event          (GtkWidget          *widget,
						     GdkEventCrossing   *event,
						     gpointer            event_data);
static int     ancestor_leave_notify_event          (GtkWidget          *widget,
						     GdkEventCrossing   *event,
						     gpointer            event_data);
static int     ancestor_motion_notify_event         (GtkWidget          *widget,
						     GdkEventMotion     *event,
						     gpointer            event_data);
static int     ancestor_button_press_event          (GtkWidget          *widget,
						     GdkEventButton     *event,
						     gpointer            event_data);
static int     ancestor_button_release_event        (GtkWidget          *widget,
						     GdkEventButton     *event,
						     gpointer            event_data);

EEL_CLASS_BOILERPLATE (EelImageTable, eel_image_table, EEL_TYPE_WRAP_TABLE)

static void
eel_image_table_class_init (EelImageTableClass *image_table_class)
{
	GObjectClass *object_class = G_OBJECT_CLASS (image_table_class);
	GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (image_table_class);
	GtkContainerClass *container_class = GTK_CONTAINER_CLASS (image_table_class);

	/* GObjectClass */
	object_class->finalize = eel_image_table_finalize;
	
 	/* GtkWidgetClass */
 	widget_class->realize = eel_image_table_realize;
 	widget_class->unrealize = eel_image_table_unrealize;

 	/* GtkContainerClass */
	container_class->remove = eel_image_table_remove;
	container_class->child_type = eel_image_table_child_type;

	/* Signals */
	image_table_signals[CHILD_ENTER] = g_signal_new ("child_enter",
							 G_TYPE_FROM_CLASS (object_class),
							 G_SIGNAL_RUN_LAST,
							 G_STRUCT_OFFSET (EelImageTableClass, child_enter),
							 NULL, NULL,
							 eel_marshal_VOID__OBJECT_POINTER,
							 G_TYPE_NONE,
							 2,
							 GTK_TYPE_WIDGET,
							 G_TYPE_POINTER);
	image_table_signals[CHILD_LEAVE] = g_signal_new ("child_leave",
							 G_TYPE_FROM_CLASS (object_class),
							 G_SIGNAL_RUN_LAST,
							 G_STRUCT_OFFSET (EelImageTableClass, child_leave),
							 NULL, NULL,
							 eel_marshal_VOID__OBJECT_POINTER,
							 G_TYPE_NONE,
							 2,
							 GTK_TYPE_WIDGET,
							 G_TYPE_POINTER);
	image_table_signals[CHILD_PRESSED] = g_signal_new ("child_pressed",
							   G_TYPE_FROM_CLASS (object_class),
							   G_SIGNAL_RUN_LAST,
							   G_STRUCT_OFFSET (EelImageTableClass, child_pressed),
							   NULL, NULL,
							   eel_marshal_VOID__OBJECT_POINTER,
							   G_TYPE_NONE,
							   2,
							   GTK_TYPE_WIDGET,
							   G_TYPE_POINTER);
	image_table_signals[CHILD_RELEASED] = g_signal_new ("child_released",
							    G_TYPE_FROM_CLASS (object_class),
							    G_SIGNAL_RUN_LAST,
							    G_STRUCT_OFFSET (EelImageTableClass, child_released),
							    NULL, NULL,
							    eel_marshal_VOID__OBJECT_POINTER,
							    G_TYPE_NONE,
							    2,
							    GTK_TYPE_WIDGET,
							    G_TYPE_POINTER);
	image_table_signals[CHILD_CLICKED] = g_signal_new ("child_clicked",
							   G_TYPE_FROM_CLASS (object_class),
							   G_SIGNAL_RUN_LAST,
							   G_STRUCT_OFFSET (EelImageTableClass, child_clicked),
							   NULL, NULL,
							   eel_marshal_VOID__OBJECT_POINTER,
							   G_TYPE_NONE,
							   2,
							   GTK_TYPE_WIDGET,
							   G_TYPE_POINTER);
}

static void
eel_image_table_init (EelImageTable *image_table)
{
	GTK_WIDGET_SET_FLAGS (image_table, GTK_NO_WINDOW);

	image_table->details = g_new0 (EelImageTableDetails, 1);
}

/* GObjectClass methods */
static void
eel_image_table_finalize (GObject *object)
{
 	EelImageTable *image_table;
	
	image_table = EEL_IMAGE_TABLE (object);

	g_free (image_table->details);

	EEL_CALL_PARENT (G_OBJECT_CLASS, finalize, (object));
}

static void
eel_image_table_realize (GtkWidget *widget)
{
	GtkWidget *windowed_ancestor;

	g_assert (EEL_IS_IMAGE_TABLE (widget));
	
	/* Chain realize */
	EEL_CALL_PARENT (GTK_WIDGET_CLASS, realize, (widget));

	windowed_ancestor = eel_gtk_widget_find_windowed_ancestor (widget);
	g_assert (GTK_IS_WIDGET (windowed_ancestor));
	
	gtk_widget_add_events (windowed_ancestor,
			       GDK_BUTTON_PRESS_MASK
			       | GDK_BUTTON_RELEASE_MASK
			       | GDK_BUTTON_MOTION_MASK
			       | GDK_ENTER_NOTIFY_MASK
			       | GDK_LEAVE_NOTIFY_MASK
			       | GDK_POINTER_MOTION_MASK);

	eel_gtk_signal_connect_while_realized (GTK_OBJECT (windowed_ancestor),
					       "enter_notify_event",
					       G_CALLBACK (ancestor_enter_notify_event),
					       widget,
					       widget);
	
	eel_gtk_signal_connect_while_realized (GTK_OBJECT (windowed_ancestor),
					       "leave_notify_event",
					       G_CALLBACK (ancestor_leave_notify_event),
					       widget,
					       widget);
	
	eel_gtk_signal_connect_while_realized (GTK_OBJECT (windowed_ancestor),
					       "motion_notify_event",
					       G_CALLBACK (ancestor_motion_notify_event),
					       widget,
					       widget);
	
	eel_gtk_signal_connect_while_realized (GTK_OBJECT (windowed_ancestor),
					       "button_press_event",
					       G_CALLBACK (ancestor_button_press_event),
					       widget,
					       widget);
	
	eel_gtk_signal_connect_while_realized (GTK_OBJECT (windowed_ancestor),
					       "button_release_event",
					       G_CALLBACK (ancestor_button_release_event),
					       widget,
					       widget);
}

static void
eel_image_table_unrealize (GtkWidget *widget)
{
	EelImageTable *image_table;

	g_assert (EEL_IS_IMAGE_TABLE (widget));

	image_table = EEL_IMAGE_TABLE (widget);

	if (image_table->details->clear_gc != NULL) {
		g_object_unref (image_table->details->clear_gc);
		image_table->details->clear_gc = NULL;
	}

	/* Chain unrealize */
	EEL_CALL_PARENT (GTK_WIDGET_CLASS, unrealize, (widget));
}

/* GtkContainerClass methods */
static void
eel_image_table_remove (GtkContainer *container,
			GtkWidget *child)
{
	EelImageTable *image_table;
	
	g_assert (EEL_IS_IMAGE_TABLE (container));
	g_assert (EEL_IS_LABELED_IMAGE (child));
	
	image_table = EEL_IMAGE_TABLE (container);

	if (child == image_table->details->child_under_pointer) {
		image_table->details->child_under_pointer = NULL;
	}

	if (child == image_table->details->child_being_pressed) {
		image_table->details->child_being_pressed = NULL;
	}

	EEL_CALL_PARENT (GTK_CONTAINER_CLASS, remove, (container, child));
}

static GType
eel_image_table_child_type (GtkContainer *container)
{
	return EEL_TYPE_LABELED_IMAGE;
}

/* Private EelImageTable methods */

static void
image_table_emit_signal (EelImageTable *image_table,
			 GtkWidget *child,
			 guint signal_index,
			 int x,
			 int y,
			 int button,
			 guint state,
			 GdkEvent *gdk_event)
{
	EelImageTableEvent event;

	g_assert (EEL_IS_IMAGE_TABLE (image_table));
	g_assert (GTK_IS_WIDGET (child));
	g_assert (signal_index < LAST_SIGNAL);

	event.x = x;
	event.y = y;
	event.button = button;
	event.state = state;
	event.event = gdk_event;
	
	g_signal_emit (image_table, 
		       image_table_signals[signal_index],
		       0,
		       child,
		       &event);
}

static void
image_table_handle_motion (EelImageTable *image_table,
			   int x,
			   int y,
			   GdkEvent *event)
{
	GtkWidget *child;
	GtkWidget *leave_emit_child = NULL;
	GtkWidget *enter_emit_child = NULL;

	g_assert (EEL_IS_IMAGE_TABLE (image_table));

	child = eel_wrap_table_find_child_at_event_point (EEL_WRAP_TABLE (image_table), x, y);

	if (child && !GTK_WIDGET_SENSITIVE (child)) {
		return;
	}

	if (child == image_table->details->child_under_pointer) {
		return;
	}

	if (child != NULL) {
		if (image_table->details->child_under_pointer != NULL) {
			leave_emit_child = image_table->details->child_under_pointer;
		}

		image_table->details->child_under_pointer = child;
		enter_emit_child = image_table->details->child_under_pointer;
	} else {
		if (image_table->details->child_under_pointer != NULL) {
			leave_emit_child = image_table->details->child_under_pointer;
		}

		image_table->details->child_under_pointer = NULL;
	}

	if (leave_emit_child != NULL) {
		image_table_emit_signal (image_table,
					 leave_emit_child,
					 CHILD_LEAVE,
					 x,
					 y,
					 0,
					 0,
					 (GdkEvent *)event);
	}

	if (enter_emit_child != NULL) {
		image_table_emit_signal (image_table,
					 enter_emit_child,
					 CHILD_ENTER,
					 x,
					 y,
					 0,
					 0,
					 (GdkEvent *)event);
	}
}

static int
ancestor_enter_notify_event (GtkWidget *widget,
			     GdkEventCrossing *event,
			     gpointer event_data)
{
	g_assert (GTK_IS_WIDGET (widget));
	g_assert (EEL_IS_IMAGE_TABLE (event_data));
	g_assert (event != NULL);

	image_table_handle_motion (EEL_IMAGE_TABLE (event_data), event->x, event->y, (GdkEvent *) event);

	return FALSE;
}

static int
ancestor_leave_notify_event (GtkWidget *widget,
			     GdkEventCrossing *event,
			     gpointer event_data)
{
	EelIRect bounds;
	int x = -1;
	int y = -1;
	
	g_assert (GTK_IS_WIDGET (widget));
	g_assert (EEL_IS_IMAGE_TABLE (event_data));
	g_assert (event != NULL);

	bounds = eel_gtk_widget_get_bounds (GTK_WIDGET (event_data));
	
	if (eel_irect_contains_point (bounds, event->x, event->y)) {
		x = event->x;
		y = event->y;
	}

	image_table_handle_motion (EEL_IMAGE_TABLE (event_data), x, y, (GdkEvent *) event);
	
	return FALSE;
}

static int
ancestor_motion_notify_event (GtkWidget *widget,
			      GdkEventMotion *event,
			      gpointer event_data)
{
	g_assert (GTK_IS_WIDGET (widget));
	g_assert (EEL_IS_IMAGE_TABLE (event_data));
	g_assert (event != NULL);

	image_table_handle_motion (EEL_IMAGE_TABLE (event_data), (int) event->x, (int) event->y, (GdkEvent *) event);

	return FALSE;
}

static int
ancestor_button_press_event (GtkWidget *widget,
			     GdkEventButton *event,
			     gpointer event_data)
{
  	EelImageTable *image_table;
	GtkWidget *child;

	g_assert (GTK_IS_WIDGET (widget));
	g_assert (EEL_IS_IMAGE_TABLE (event_data));
	g_assert (event != NULL);

 	image_table = EEL_IMAGE_TABLE (event_data);

	child = eel_wrap_table_find_child_at_event_point (EEL_WRAP_TABLE (image_table), event->x, event->y);

	if (child && !GTK_WIDGET_SENSITIVE (child)) {
		return FALSE;
	}

	if (child != NULL) {
		if (child == image_table->details->child_under_pointer) {
			image_table->details->child_being_pressed = child;
			image_table_emit_signal (image_table,
						 child,
						 CHILD_PRESSED,
						 event->x,
						 event->y,
						 event->button,
						 event->state,
						 (GdkEvent *)event);
		}
	}

	return FALSE;
}

static int
ancestor_button_release_event (GtkWidget *widget,
			       GdkEventButton *event,
			       gpointer event_data)
{
  	EelImageTable *image_table;
	GtkWidget *child;
	GtkWidget *released_emit_child = NULL;
	GtkWidget *clicked_emit_child = NULL;

	g_assert (GTK_IS_WIDGET (widget));
	g_assert (EEL_IS_IMAGE_TABLE (event_data));
	g_assert (event != NULL);

 	image_table = EEL_IMAGE_TABLE (event_data);

	child = eel_wrap_table_find_child_at_event_point (EEL_WRAP_TABLE (image_table), event->x, event->y);

	if (child && !GTK_WIDGET_SENSITIVE (child)) {
		return FALSE;
	}

	if (image_table->details->child_being_pressed != NULL) {
		released_emit_child = image_table->details->child_being_pressed;
	}

	if (child != NULL) {
		if (child == image_table->details->child_being_pressed) {
			clicked_emit_child = child;
		}
	}
	
	image_table->details->child_being_pressed = NULL;

	if (released_emit_child != NULL) {
		image_table_emit_signal (image_table,
					 released_emit_child,
					 CHILD_RELEASED,
					 event->x,
					 event->y,
					 event->button,
					 event->state,
					 (GdkEvent *)event);
	}
	
	if (clicked_emit_child != NULL) {

		image_table_emit_signal (image_table,
					 clicked_emit_child,
					 CHILD_CLICKED,
					 event->x,
					 event->y,
					 event->button,
					 event->state,
					 (GdkEvent *)event);
	}
	
	return FALSE;
}

/**
 * eel_image_table_new:
 */
GtkWidget*
eel_image_table_new (gboolean homogeneous)
{
	EelImageTable *image_table;

	image_table = EEL_IMAGE_TABLE (gtk_widget_new (eel_image_table_get_type (), NULL));

	eel_wrap_table_set_homogeneous (EEL_WRAP_TABLE (image_table), homogeneous);
	
	return GTK_WIDGET (image_table);
}

/**
 * eel_image_table_add_empty_child:
 * @image_table: A EelImageTable.
 *
 * Add a "empty" child to the table.  Useful when you want to have
 * empty space between 2 children.
 *
 * Returns: The empty child - A EelLabeledImage widget with no label
 *          or pixbuf.
 */
GtkWidget *
eel_image_table_add_empty_image (EelImageTable *image_table)
{
	GtkWidget *empty;

	g_return_val_if_fail (EEL_IS_IMAGE_TABLE (image_table), NULL);

	empty = eel_labeled_image_new (NULL, NULL);
	gtk_container_add (GTK_CONTAINER (image_table), empty);
	gtk_widget_set_sensitive (empty, FALSE);

	return empty;
}