path: root/lib/ephy-gui.c

/*
 *  Copyright (C) 2002 Marco Pesenti Gritti
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  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 General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include "ephy-gui.h"
#include "eel-gconf-extensions.h"

#include <ctype.h>
#include <string.h>
#include <libgnome/gnome-i18n.h>
#include <gtk/gtktreemodel.h>

/* Styles for tab labels */
GtkStyle *loading_text_style = NULL;
GtkStyle *new_text_style = NULL;

/**
 * gul_gui_menu_position_under_widget:
 */
void
ephy_gui_menu_position_under_widget (GtkMenu   *menu,
                     gint      *x,
                     gint      *y,
                     gboolean  *push_in,
                     gpointer   user_data)
{
    GtkWidget *w = GTK_WIDGET (user_data);
    gint width, height;
    gint screen_width, screen_height;
    GtkRequisition requisition;

    gdk_drawable_get_size (w->window, &width, &height);
    gdk_window_get_origin (w->window, x, y);
    *y = *y + height;

    gtk_widget_size_request (GTK_WIDGET (menu), &requisition);

    screen_width = gdk_screen_width ();
    screen_height = gdk_screen_height ();

    *x = CLAMP (*x, 0, MAX (0, screen_width - requisition.width));
    *y = CLAMP (*y, 0, MAX (0, screen_height - requisition.height));
}

/**
 * gul_gui_gtk_radio_button_get: get the active member of a radiobutton
 * group from one of the buttons in the group. This should be in GTK+!
 */
gint
ephy_gui_gtk_radio_button_get (GtkRadioButton *radio_button)
{
    GtkToggleButton *toggle_button;
    gint i, length;
        GSList *list;

    /* get group list */
        list = gtk_radio_button_get_group (GTK_RADIO_BUTTON (radio_button));
        length = g_slist_length (list);

    /* iterate over list to find active button */
    for (i = 0; list != NULL; i++, list = g_slist_next (list))
    {
        /* get button and text */
        toggle_button = GTK_TOGGLE_BUTTON (list->data);
        if (gtk_toggle_button_get_active (toggle_button))
        {
            break;
        }
    }

    /* check we didn't run off end */
    g_assert (list != NULL);

    /* return index (reverse order!) */
    return (length - 1) - i;
}

/**
 * gul_gui_gtk_radio_button_set: set the active member of a radiobutton
 * group from one of the buttons in the group. This should be in GTK+!
 */
void
ephy_gui_gtk_radio_button_set (GtkRadioButton *radio_button, gint index)
{
    GtkToggleButton *button;
    GSList *list;
    gint length;

    /* get the list */
        list = gtk_radio_button_get_group (GTK_RADIO_BUTTON (radio_button));

    /* check out the length */
        length = g_slist_length (list);

        /* new buttons are *preppended* to the list, so button added as first
         * has last position in the list */
        index = (length - 1) - index;

    /* find the right button */
        button = GTK_TOGGLE_BUTTON (g_slist_nth_data (list, index));

    /* set it... this will de-activate the others in the group */
    if (gtk_toggle_button_get_active (button) == FALSE)
    {
        gtk_toggle_button_set_active (button, TRUE);
    }
}

GtkWidget *
ephy_gui_append_new_menuitem (GtkWidget  *menu,
                  const char *mnemonic,
                  GCallback   callback,
                  gpointer    data)
{
    GtkWidget *menu_item;

    menu_item = gtk_menu_item_new_with_mnemonic (mnemonic);
    gtk_widget_show (menu_item);
    gtk_menu_shell_append (GTK_MENU_SHELL (menu),
                   menu_item);

    if (callback)
    {
        g_signal_connect (G_OBJECT (menu_item),
                  "activate",
                  callback, data);
    }

    return menu_item;
}

GtkWidget *
ephy_gui_append_new_menuitem_stock (GtkWidget  *menu,
                    const char *stock_id,
                    GCallback   callback,
                    gpointer    data)
{
    GtkWidget *menu_item;

    menu_item = gtk_image_menu_item_new_from_stock (stock_id, NULL);
    gtk_widget_show (menu_item);
    gtk_menu_shell_append (GTK_MENU_SHELL (menu),
                   menu_item);

    if (callback)
    {
        g_signal_connect (G_OBJECT (menu_item),
                  "activate",
                  callback, data);
    }

    return menu_item;
}

GtkWidget *
ephy_gui_append_new_menuitem_stock_icon (GtkWidget *menu,
                     const char *stock_id,
                     const char *mnemonic,
                     GCallback callback,
                     gpointer data)
{
    GtkWidget *menu_item;
    GtkWidget *image;

    menu_item = gtk_image_menu_item_new_with_mnemonic (mnemonic);
    image = gtk_image_new_from_stock (stock_id, GTK_ICON_SIZE_MENU);
    gtk_widget_show (image);
    gtk_image_menu_item_set_image (GTK_IMAGE_MENU_ITEM (menu_item), image);

    gtk_widget_show (menu_item);
    gtk_menu_shell_append (GTK_MENU_SHELL (menu),
                   menu_item);

    if (callback)
    {
        g_signal_connect (G_OBJECT (menu_item),
                  "activate",
                  callback, data);
    }

    return menu_item;
}

GtkWidget *
ephy_gui_append_new_check_menuitem (GtkWidget  *menu,
                    const char *mnemonic,
                    gboolean value,
                    GCallback callback,
                    gpointer data)
{
    GtkWidget *menu_item;

    menu_item = gtk_check_menu_item_new_with_mnemonic (mnemonic);
    gtk_widget_show (menu_item);
    gtk_menu_shell_append (GTK_MENU_SHELL (menu),
                   menu_item);

    gtk_check_menu_item_set_active (GTK_CHECK_MENU_ITEM (menu_item), value);

    if (callback)
    {
        g_signal_connect (G_OBJECT (menu_item),
                  "activate",
                  callback, data);
    }

    return menu_item;
}

GtkWidget *
ephy_gui_append_separator (GtkWidget *menu)
{
    GtkWidget *menu_item;

    menu_item = gtk_menu_item_new ();
    gtk_widget_show (menu_item);
    gtk_menu_shell_append (GTK_MENU_SHELL (menu),
                   menu_item);

    return menu_item;
}

gboolean
ephy_gui_confirm_overwrite_file (GtkWidget *parent, const char *filename)
{
    char *question;
    GtkWidget *dialog;
    gboolean res;

    if (!g_file_test (filename, G_FILE_TEST_EXISTS))
    {
        return TRUE;
    }

    question = g_strdup_printf (_("File %s will be overwritten.\n"
                    "If you choose yes, the contents will be lost.\n\n"
                    "Do you want to continue?"), filename);
    dialog = gtk_message_dialog_new (parent ? GTK_WINDOW(parent) : NULL,
                             GTK_DIALOG_MODAL,
                         GTK_MESSAGE_QUESTION,
                         GTK_BUTTONS_YES_NO,
                         question);
    res = (gtk_dialog_run (GTK_DIALOG (dialog)) == GTK_RESPONSE_YES);
    gtk_widget_destroy (dialog);
    g_free (question);

    return res;
}

static guint32
shift_color_component (guchar component, float shift_by)
{
    guint32 result;
    if (shift_by > 1.0) {
        result = component * (2 - shift_by);
    } else {
        result = 0xff - shift_by * (0xff - component);
    }

    return result & 0xff;
}

/**
 * ephy_gui_rgb_shift_color
 * @color: A color.
 * @shift_by: darken or lighten factor.
 * Returns: An darkened or lightened rgb value.
 *
 * Darkens (@shift_by > 1) or lightens (@shift_by < 1)
 * @color.
 */
guint32
ephy_gui_rgb_shift_color (guint32 color, float shift_by)
{
    guint32 result;

    /* shift red by shift_by */
    result = shift_color_component((color & 0x00ff0000) >> 16, shift_by);
    result <<= 8;
    /* shift green by shift_by */
    result |=  shift_color_component((color & 0x0000ff00) >> 8, shift_by);
    result <<= 8;
    /* shift blue by shift_by */
    result |=  shift_color_component((color & 0x000000ff), shift_by);

    /* alpha doesn't change */
    result |= (0xff000000 & color);

    return result;
}

static guint32
rgb16_to_rgb (gushort r, gushort g, gushort b)
{
    guint32 result;

    result = (0xff0000 | (r & 0xff00));
    result <<= 8;
    result |= ((g & 0xff00) | (b >> 8));

    return result;
}

/**
 * ephy_gui_gdk_color_to_rgb
 * @color: A GdkColor style color.
 * Returns: An rgb value.
 *
 * Converts from a GdkColor stlye color to a gdk_rgb one.
 * Alpha gets set to fully opaque
 */
guint32
ephy_gui_gdk_color_to_rgb (const GdkColor *color)
{
    return rgb16_to_rgb (color->red, color->green, color->blue);
}

/**
 * ephy_gui_rgb_to_color
 * @color: a gdk_rgb style value.
 *
 * Converts from a gdk_rgb value style to a GdkColor one.
 * The gdk_rgb color alpha channel is ignored.
 *
 * Return value: A GdkColor structure version of the given RGB color.
 */
GdkColor
ephy_gui_gdk_rgb_to_color (guint32 color)
{
    GdkColor result;

    result.red = ((color >> 16) & 0xFF) * 0x101;
    result.green = ((color >> 8) & 0xFF) * 0x101;
    result.blue = (color & 0xff) * 0x101;
    result.pixel = 0;

    return result;
}