path: root/e-util/e-cell-popup.c

/*
 * 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.
 *
 * 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 General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this 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.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <gdk/gdkkeysyms.h>

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

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

#define E_CELL_POPUP_ARROW_SIZE     16
#define E_CELL_POPUP_ARROW_PAD      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,
                     cairo_t    *cr,
                     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,
          cairo_t *cr,
          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;
    gboolean show_popup_arrow;

    cairo_save (cr);

    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) {
        GtkStyleContext *style_context;
        GdkRGBA color;
        gint arrow_x;
        gint arrow_y;
        gint arrow_size;
        gint midpoint_y;

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

        midpoint_y = y1 + ((y2 - y1 + 1) / 2);

        arrow_x = x2 - E_CELL_POPUP_ARROW_SIZE;
        arrow_y = midpoint_y - E_CELL_POPUP_ARROW_SIZE / 2;
        arrow_size = E_CELL_POPUP_ARROW_SIZE;

        style_context = gtk_widget_get_style_context (canvas);

        gtk_style_context_save (style_context);

        gtk_style_context_add_class (
            style_context, GTK_STYLE_CLASS_CELL);

        gtk_style_context_get_background_color (
            style_context, GTK_STATE_FLAG_NORMAL, &color);

        cairo_save (cr);
        gdk_cairo_set_source_rgba (cr, &color);
        gtk_render_background (
            style_context, cr,
            (gdouble) arrow_x,
            (gdouble) arrow_y,
            (gdouble) arrow_size,
            (gdouble) arrow_size);
        cairo_restore (cr);

        arrow_x += E_CELL_POPUP_ARROW_PAD;
        arrow_y += E_CELL_POPUP_ARROW_PAD;
        arrow_size -= (E_CELL_POPUP_ARROW_PAD * 2);

        cairo_save (cr);
        gtk_render_arrow (
            style_context, cr, G_PI,
            (gdouble) arrow_x,
            (gdouble) arrow_y,
            (gdouble) arrow_size);
        cairo_restore (cr);

        gtk_style_context_restore (style_context);
    } else {
        e_cell_draw (
            ecp_view->child_view, cr, model_col,
            view_col, row, flags, x1, y1, x2, y2);
    }

    cairo_restore (cr);
}

/*
 * 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_SIZE) {
                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);
}