/*
 * e-cell-popup.c: Popup cell renderer
 *
 * This program 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) version 3.
 *
 * This program 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 the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

/*
 * ECellPopup - an abstract ECell class used to support popup selections like
 * a GtkCombo widget. It contains a child ECell, e.g. an ECellText, but when
 * selected it displays an arrow on the right edge which the user can click to
 * show a popup. Subclasses implement the popup class function to show the
 * popup.
 */

#include <config.h>

#include <gdk/gdkkeysyms.h>

#include "gal-a11y-e-cell-popup.h"
#include "gal-a11y-e-cell-registry.h"
#include "e-util/e-util.h"

#include "e-cell-popup.h"
#include "e-table-item.h"
#include <gtk/gtk.h>

#define E_CELL_POPUP_ARROW_WIDTH	16
#define E_CELL_POPUP_ARROW_XPAD		3
#define E_CELL_POPUP_ARROW_YPAD		3

static void	e_cell_popup_dispose	(GObject	*object);

static ECellView* ecp_new_view		(ECell		*ecell,
					 ETableModel	*table_model,
					 void		*e_table_item_view);
static void	ecp_kill_view		(ECellView	*ecv);
static void	ecp_realize		(ECellView	*ecv);
static void	ecp_unrealize		(ECellView	*ecv);
static void	ecp_draw		(ECellView	*ecv,
					 GdkDrawable	*drawable,
					 gint		 model_col,
					 gint		 view_col,
					 gint		 row,
					 ECellFlags	 flags,
					 gint		 x1,
					 gint		 y1,
					 gint		 x2,
					 gint		 y2);
static gint	ecp_event		(ECellView	*ecv,
					 GdkEvent	*event,
					 gint		 model_col,
					 gint		 view_col,
					 gint		 row,
					 ECellFlags	 flags,
					 ECellActions	*actions);
static gint	ecp_height		(ECellView	*ecv,
					 gint		 model_col,
					 gint		 view_col,
					 gint		 row);
static gpointer	ecp_enter_edit		(ECellView	*ecv,
					 gint		 model_col,
					 gint		 view_col,
					 gint		 row);
static void	ecp_leave_edit		(ECellView	*ecv,
					 gint		 model_col,
					 gint		 view_col,
					 gint		 row,
					 void		*edit_context);
static void	ecp_print		(ECellView	*ecv,
					 GtkPrintContext *context,
					 gint		 model_col,
					 gint		 view_col,
					 gint		 row,
					 gdouble		 width,
					 gdouble		 height);
static gdouble	ecp_print_height	(ECellView	*ecv,
					 GtkPrintContext *context,
					 gint		 model_col,
					 gint		 view_col,
					 gint		 row,
					 gdouble		 width);
static gint	ecp_max_width		(ECellView	*ecv,
					 gint		 model_col,
					 gint		 view_col);
static gchar *ecp_get_bg_color (ECellView *ecell_view, gint row);

static gint e_cell_popup_do_popup	(ECellPopupView	*ecp_view,
					 GdkEvent	*event,
					 gint             row,
					 gint             model_col);

G_DEFINE_TYPE (ECellPopup, e_cell_popup, E_TYPE_CELL)

static void
e_cell_popup_class_init		(ECellPopupClass	*class)
{
	ECellClass *ecc = E_CELL_CLASS (class);

	G_OBJECT_CLASS (class)->dispose = e_cell_popup_dispose;

	ecc->new_view     = ecp_new_view;
	ecc->kill_view    = ecp_kill_view;
	ecc->realize      = ecp_realize;
	ecc->unrealize    = ecp_unrealize;
	ecc->draw         = ecp_draw;
	ecc->event        = ecp_event;
	ecc->height       = ecp_height;
	ecc->enter_edit   = ecp_enter_edit;
	ecc->leave_edit   = ecp_leave_edit;
	ecc->print        = ecp_print;
	ecc->print_height = ecp_print_height;
	ecc->max_width	  = ecp_max_width;
	ecc->get_bg_color = ecp_get_bg_color;

	gal_a11y_e_cell_registry_add_cell_type (NULL,
                                                E_TYPE_CELL_POPUP,
                                                gal_a11y_e_cell_popup_new);
}

static void
e_cell_popup_init		(ECellPopup	*ecp)
{
	ecp->popup_shown = FALSE;
	ecp->popup_model = NULL;
}

/**
 * e_cell_popup_new:
 *
 * Creates a new ECellPopup renderer.
 *
 * Returns: an ECellPopup object.
 */
ECell *
e_cell_popup_new (void)
{
	return g_object_new (E_TYPE_CELL_POPUP, NULL);
}

static void
e_cell_popup_dispose (GObject *object)
{
	ECellPopup *ecp = E_CELL_POPUP (object);

	if (ecp->child)
		g_object_unref (ecp->child);
	ecp->child = NULL;

	G_OBJECT_CLASS (e_cell_popup_parent_class)->dispose (object);
}

/*
 * ECell::new_view method
 */
static ECellView *
ecp_new_view (ECell *ecell, ETableModel *table_model, gpointer e_table_item_view)
{
	ECellPopup *ecp = E_CELL_POPUP (ecell);
	ECellPopupView *ecp_view;

	/* We must have a child ECell before we create any views. */
	g_return_val_if_fail (ecp->child != NULL, NULL);

	ecp_view = g_new0 (ECellPopupView, 1);

	ecp_view->cell_view.ecell = ecell;
	ecp_view->cell_view.e_table_model = table_model;
	ecp_view->cell_view.e_table_item_view = e_table_item_view;
        ecp_view->cell_view.kill_view_cb = NULL;
        ecp_view->cell_view.kill_view_cb_data = NULL;

	ecp_view->child_view = e_cell_new_view (ecp->child, table_model,
						e_table_item_view);

	return (ECellView*) ecp_view;
}

/*
 * ECell::kill_view method
 */
static void
ecp_kill_view (ECellView *ecv)
{
	ECellPopupView *ecp_view = (ECellPopupView *) ecv;

	if (ecp_view->cell_view.kill_view_cb)
		ecp_view->cell_view.kill_view_cb (
			ecv, ecp_view->cell_view.kill_view_cb_data);

	if (ecp_view->cell_view.kill_view_cb_data)
		g_list_free (ecp_view->cell_view.kill_view_cb_data);

	if (ecp_view->child_view)
		e_cell_kill_view (ecp_view->child_view);

	g_free (ecp_view);
}

/*
 * ECell::realize method
 */
static void
ecp_realize (ECellView *ecv)
{
	ECellPopupView *ecp_view = (ECellPopupView *) ecv;

	e_cell_realize (ecp_view->child_view);

	if (E_CELL_CLASS (e_cell_popup_parent_class)->realize)
		(* E_CELL_CLASS (e_cell_popup_parent_class)->realize) (ecv);
}

/*
 * ECell::unrealize method
 */
static void
ecp_unrealize (ECellView *ecv)
{
	ECellPopupView *ecp_view = (ECellPopupView *) ecv;

	e_cell_unrealize (ecp_view->child_view);

	if (E_CELL_CLASS (e_cell_popup_parent_class)->unrealize)
		(* E_CELL_CLASS (e_cell_popup_parent_class)->unrealize) (ecv);
}

/*
 * ECell::draw method
 */
static void
ecp_draw (ECellView *ecv, GdkDrawable *drawable,
	  gint model_col, gint view_col, gint row, ECellFlags flags,
	  gint x1, gint y1, gint x2, gint y2)
{
	ECellPopup *ecp = E_CELL_POPUP (ecv->ecell);
	ECellPopupView *ecp_view = (ECellPopupView *) ecv;
	GtkWidget *canvas;
	GtkShadowType shadow;
	GdkRectangle rect;
	gboolean show_popup_arrow;

	canvas = GTK_WIDGET (GNOME_CANVAS_ITEM (ecv->e_table_item_view)->canvas);

	/* Display the popup arrow if we are the cursor cell, or the popup
	   is shown for this cell. */
	show_popup_arrow =
		e_table_model_is_cell_editable (
			ecv->e_table_model, model_col, row) &&
		(flags & E_CELL_CURSOR ||
		 (ecp->popup_shown && ecp->popup_view_col == view_col
		  && ecp->popup_row == row
		  && ecp->popup_model == ((ECellView *) ecp_view)->e_table_model));

	if (flags & E_CELL_CURSOR)
		ecp->popup_arrow_shown = show_popup_arrow;

	if (show_popup_arrow) {
		GtkStyle *style;

		e_cell_draw (ecp_view->child_view, drawable, model_col,
			     view_col, row, flags,
			     x1, y1, x2 - E_CELL_POPUP_ARROW_WIDTH, y2);

		rect.x = x2 - E_CELL_POPUP_ARROW_WIDTH;
		rect.y = y1 + 1;
		rect.width = E_CELL_POPUP_ARROW_WIDTH;
		rect.height = y2 - y1 - 2;

		if (ecp->popup_shown)
			shadow = GTK_SHADOW_IN;
		else
			shadow = GTK_SHADOW_OUT;

		style = gtk_widget_get_style (canvas);

		gtk_paint_box (style, drawable,
			       GTK_STATE_NORMAL, shadow,
			       &rect, canvas, "ecellpopup",
			       rect.x, rect.y, rect.width, rect.height);
		gtk_paint_arrow (style, drawable,
				 GTK_STATE_NORMAL, GTK_SHADOW_NONE,
				 &rect, canvas, NULL,
				 GTK_ARROW_DOWN, TRUE,
				 rect.x + E_CELL_POPUP_ARROW_XPAD,
				 rect.y + E_CELL_POPUP_ARROW_YPAD,
				 rect.width - E_CELL_POPUP_ARROW_XPAD * 2,
				 rect.height - E_CELL_POPUP_ARROW_YPAD * 2);
	} else {
		e_cell_draw (ecp_view->child_view, drawable, model_col,
			     view_col, row, flags, x1, y1, x2, y2);
	}
}

/*
 * ECell::event method
 */
static gint
ecp_event (ECellView *ecv, GdkEvent *event, gint model_col, gint view_col,
	   gint row, ECellFlags flags, ECellActions *actions)
{
	ECellPopupView *ecp_view = (ECellPopupView *) ecv;
	ECellPopup *ecp = E_CELL_POPUP (ecp_view->cell_view.ecell);
	ETableItem *eti = E_TABLE_ITEM (ecv->e_table_item_view);
	gint width;

	switch (event->type) {
	case GDK_BUTTON_PRESS:
		if (e_table_model_is_cell_editable (ecv->e_table_model, model_col, row) &&
		    flags & E_CELL_CURSOR
		    && ecp->popup_arrow_shown) {
			width = e_table_header_col_diff (eti->header, view_col,
							 view_col + 1);

			/* FIXME: The event coords seem to be relative to the
			   text within the cell, so we have to add 4. */
			if (event->button.x + 4 >= width - E_CELL_POPUP_ARROW_WIDTH) {
				return e_cell_popup_do_popup (ecp_view, event, row, view_col);
			}
		}
		break;
	case GDK_KEY_PRESS:
		if (e_table_model_is_cell_editable (ecv->e_table_model, model_col, row) &&
		    event->key.state & GDK_MOD1_MASK
		    && event->key.keyval == GDK_KEY_Down) {
			return e_cell_popup_do_popup (ecp_view, event, row, view_col);
		}
		break;
	default:
		break;
	}

	return e_cell_event (ecp_view->child_view, event, model_col, view_col,
			     row, flags, actions);
}

/*
 * ECell::height method
 */
static gint
ecp_height (ECellView *ecv, gint model_col, gint view_col, gint row)
{
	ECellPopupView *ecp_view = (ECellPopupView *) ecv;

	return e_cell_height (ecp_view->child_view, model_col, view_col, row);
}

/*
 * ECellView::enter_edit method
 */
static gpointer
ecp_enter_edit (ECellView *ecv, gint model_col, gint view_col, gint row)
{
	ECellPopupView *ecp_view = (ECellPopupView *) ecv;

	return e_cell_enter_edit (ecp_view->child_view, model_col, view_col, row);
}

/*
 * ECellView::leave_edit method
 */
static void
ecp_leave_edit (ECellView *ecv, gint model_col, gint view_col, gint row,
		gpointer edit_context)
{
	ECellPopupView *ecp_view = (ECellPopupView *) ecv;

	e_cell_leave_edit (ecp_view->child_view, model_col, view_col, row,
			   edit_context);
}

static void
ecp_print (ECellView *ecv, GtkPrintContext *context,
	   gint model_col, gint view_col, gint row, gdouble width, gdouble height)
{
	ECellPopupView *ecp_view = (ECellPopupView *) ecv;

	e_cell_print (ecp_view->child_view, context, model_col, view_col, row,
		      width, height);
}

static gdouble
ecp_print_height (ECellView *ecv, GtkPrintContext *context,
		  gint model_col, gint view_col, gint row,
		  gdouble width)
{
	ECellPopupView *ecp_view = (ECellPopupView *) ecv;

	return e_cell_print_height (ecp_view->child_view, context, model_col,
				    view_col, row, width);
}

static gint
ecp_max_width (ECellView *ecv,
	       gint model_col,
	       gint view_col)
{
	ECellPopupView *ecp_view = (ECellPopupView *) ecv;

	return e_cell_max_width (ecp_view->child_view, model_col, view_col);
}

static gchar *
ecp_get_bg_color (ECellView *ecell_view, gint row)
{
	ECellPopupView *ecp_view = (ECellPopupView *) ecell_view;

	return e_cell_get_bg_color (ecp_view->child_view, row);
}

ECell*
e_cell_popup_get_child			(ECellPopup	*ecp)
{
	g_return_val_if_fail (E_IS_CELL_POPUP (ecp), NULL);

	return ecp->child;
}

void
e_cell_popup_set_child			(ECellPopup	*ecp,
					 ECell		*child)
{
	g_return_if_fail (E_IS_CELL_POPUP (ecp));

	if (ecp->child)
		g_object_unref (ecp->child);

	ecp->child = child;
	g_object_ref (child);
}

static gint
e_cell_popup_do_popup			(ECellPopupView	*ecp_view,
					 GdkEvent	*event,
					 gint             row,
					 gint             view_col)
{
	ECellPopup *ecp = E_CELL_POPUP (ecp_view->cell_view.ecell);
	gint (*popup_func) (ECellPopup *ecp, GdkEvent *event, gint row, gint view_col);

	ecp->popup_cell_view = ecp_view;

	popup_func = E_CELL_POPUP_CLASS (G_OBJECT_GET_CLASS (ecp))->popup;

	ecp->popup_view_col = view_col;
	ecp->popup_row = row;
	ecp->popup_model = ((ECellView *) ecp_view)->e_table_model;

	return popup_func ? popup_func (ecp, event, row, view_col) : FALSE;
}

/* This redraws the popup cell. Only use this if you know popup_view_col and
   popup_row are valid. */
void
e_cell_popup_queue_cell_redraw (ECellPopup *ecp)
{
	ETableItem *eti;

	eti = E_TABLE_ITEM (ecp->popup_cell_view->cell_view.e_table_item_view);

	e_table_item_redraw_range (
		eti, ecp->popup_view_col, ecp->popup_row,
		ecp->popup_view_col, ecp->popup_row);
}

void
e_cell_popup_set_shown  (ECellPopup *ecp,
			 gboolean    shown)
{
	ecp->popup_shown = shown;
	e_cell_popup_queue_cell_redraw (ecp);
}