window.c

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/*
 * Copyright 2006 Daniel Silverstone <dsilvers@digital-scurf.org>
 * Copyright 2006 Rob Kendrick <rjek@rjek.com>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf 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; version 2 of the License.
 *
 * NetSurf 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, see <http://www.gnu.org/licenses/>.
 */
 
/**
 * \file
 * Implementation of gtk windowing.
 */
 
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <assert.h>
#include <math.h>
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include <gdk-pixbuf/gdk-pixdata.h>
 
#include "utils/utils.h"
#include "utils/log.h"
#include "utils/utf8.h"
#include "utils/nsoption.h"
#include "utils/messages.h"
#include "utils/nsurl.h"
#include "netsurf/inttypes.h"
#include "netsurf/content.h"
#include "netsurf/browser_window.h"
#include "netsurf/mouse.h"
#include "netsurf/window.h"
#include "netsurf/plotters.h"
#include "netsurf/form.h"
#include "netsurf/keypress.h"
#include "desktop/searchweb.h"
#include "desktop/textinput.h"
 
#include "gtk/selection.h"
#include "gtk/warn.h"
#include "gtk/compat.h"
#include "gtk/gui.h"
#include "gtk/scaffolding.h"
#include "gtk/toolbar_items.h"
#include "gtk/toolbar.h"
#include "gtk/local_history.h"
#include "gtk/plotters.h"
#include "gtk/schedule.h"
#include "gtk/tabs.h"
#include "gtk/bitmap.h"
#include "gtk/gdk.h"
#include "gtk/resources.h"
#include "gtk/search.h"
#include "gtk/throbber.h"
#include "gtk/window.h"
 
/**
 * time (in ms) between throbber animation frame updates
 */
#define THROBBER_FRAME_TIME (100)
 
static GtkWidget *select_menu;
static struct form_control *select_menu_control;
 
struct gui_window {
        /**
         * The gtk scaffold object containing menu, buttons, url bar, [tabs],
         * drawing area, etc that may contain one or more gui_windows.
         */
        struct nsgtk_scaffolding *scaffold;
 
        /** The 'content' window that is rendered in the gui_window */
        struct browser_window   *bw;
 
        /** mouse state and events. */
        struct {
                struct gui_window *gui;
 
                gdouble pressed_x;
                gdouble pressed_y;
                gboolean waiting;
                browser_mouse_state state;
        } mouse;
 
        /** caret dimension and location for rendering */
        int caretx, carety, careth;
 
        /** caret shape for rendering */
        gui_pointer_shape current_pointer;
 
        /** previous event location */
        int last_x, last_y;
 
        /** controls toolbar context */
        struct nsgtk_toolbar *toolbar;
 
        /** search toolbar context */
        struct gtk_search *search;
 
        /** The top level container (tabBox) */
        GtkWidget *container;
 
        /** display widget for this page or frame */
        GtkLayout *layout;
 
        /** The container for the layout etc */
        GtkWidget *grid;
 
        /** handle to the the visible tab */
        GtkWidget *tab;
 
        /** statusbar */
        GtkLabel *status_bar;
 
        /** status pane */
        GtkPaned *paned;
 
        /** has the status pane had its first size operation yet? */
        bool paned_sized;
 
        /** The icon this window should have */
        GdkPixbuf *icon;
 
        /** The input method to use with this window */
        GtkIMContext *input_method;
 
        /** current frame of throbber */
        int throb_frame;
 
        /** list for cleanup */
        struct gui_window *next, *prev;
};
 
/**< first entry in window list */
struct gui_window *window_list = NULL;
 
static void
nsgtk_select_menu_clicked(GtkCheckMenuItem *checkmenuitem,
                          gpointer user_data)
{
        form_select_process_selection(select_menu_control,
                                      (intptr_t)user_data);
}
 
#if GTK_CHECK_VERSION(3,0,0)
 
static gboolean
nsgtk_window_draw_event(GtkWidget *widget, cairo_t *cr, gpointer data)
{
        struct gui_window *gw = data;
        struct gui_window *z;
        struct rect clip;
        struct redraw_context ctx = {
                .interactive = true,
                .background_images = true,
                .plot = &nsgtk_plotters
        };
 
        double x1;
        double y1;
        double x2;
        double y2;
 
        assert(gw);
        assert(gw->bw);
 
        for (z = window_list; z && z != gw; z = z->next)
                continue;
        assert(z);
        assert(GTK_WIDGET(gw->layout) == widget);
 
        current_cr = cr;
 
        GtkAdjustment *vscroll = nsgtk_layout_get_vadjustment(gw->layout);
        GtkAdjustment *hscroll = nsgtk_layout_get_hadjustment(gw->layout);
 
        cairo_clip_extents(cr, &x1, &y1, &x2, &y2);
 
        clip.x0 = x1;
        clip.y0 = y1;
        clip.x1 = x2;
        clip.y1 = y2;
 
        browser_window_redraw(gw->bw,
                              -gtk_adjustment_get_value(hscroll),
                              -gtk_adjustment_get_value(vscroll),
                              &clip,
                              &ctx);
 
        if (gw->careth != 0) {
                nsgtk_plot_caret(gw->caretx, gw->carety, gw->careth);
        }
 
        return FALSE;
}
 
#else
 
static gboolean
nsgtk_window_draw_event(GtkWidget *widget, GdkEventExpose *event, gpointer data)
{
        struct gui_window *gw = data;
        struct gui_window *z;
        struct rect clip;
        struct redraw_context ctx = {
                .interactive = true,
                .background_images = true,
                .plot = &nsgtk_plotters
        };
 
        assert(gw);
        assert(gw->bw);
 
        for (z = window_list; z && z != gw; z = z->next)
                continue;
        assert(z);
        assert(GTK_WIDGET(gw->layout) == widget);
 
        current_cr = gdk_cairo_create(nsgtk_layout_get_bin_window(gw->layout));
 
        clip.x0 = event->area.x;
        clip.y0 = event->area.y;
        clip.x1 = event->area.x + event->area.width;
        clip.y1 = event->area.y + event->area.height;
 
        browser_window_redraw(gw->bw, 0, 0, &clip, &ctx);
 
        if (gw->careth != 0) {
                nsgtk_plot_caret(gw->caretx, gw->carety, gw->careth);
        }
 
        cairo_destroy(current_cr);
 
        return FALSE;
}
 
#endif
 
static gboolean
nsgtk_window_motion_notify_event(GtkWidget *widget,
                                 GdkEventMotion *event,
                                 gpointer data)
{
        struct gui_window *g = data;
        bool shift = event->state & GDK_SHIFT_MASK;
        bool ctrl = event->state & GDK_CONTROL_MASK;
 
        if ((fabs(event->x - g->last_x) < 5.0) &&
            (fabs(event->y - g->last_y) < 5.0)) {
                /* Mouse hasn't moved far enough from press coordinate
                 * for this to be considered a drag.
                 */
                return FALSE;
        } else {
                /* This is a drag, ensure it's always treated as such,
                 * even if we drag back over the press location.
                 */
                g->last_x = INT_MIN;
                g->last_y = INT_MIN;
        }
 
        if (g->mouse.state & BROWSER_MOUSE_PRESS_1) {
                /* Start button 1 drag */
                browser_window_mouse_click(g->bw, BROWSER_MOUSE_DRAG_1,
                                g->mouse.pressed_x, g->mouse.pressed_y);
 
                /* Replace PRESS with HOLDING and declare drag in progress */
                g->mouse.state ^= (BROWSER_MOUSE_PRESS_1 |
                                BROWSER_MOUSE_HOLDING_1);
                g->mouse.state |= BROWSER_MOUSE_DRAG_ON;
        } else if (g->mouse.state & BROWSER_MOUSE_PRESS_2) {
                /* Start button 2 drag */
                browser_window_mouse_click(g->bw, BROWSER_MOUSE_DRAG_2,
                                g->mouse.pressed_x, g->mouse.pressed_y);
 
                /* Replace PRESS with HOLDING and declare drag in progress */
                g->mouse.state ^= (BROWSER_MOUSE_PRESS_2 |
                                BROWSER_MOUSE_HOLDING_2);
                g->mouse.state |= BROWSER_MOUSE_DRAG_ON;
        }
 
        /* Handle modifiers being removed */
        if (g->mouse.state & BROWSER_MOUSE_MOD_1 && !shift)
                g->mouse.state ^= BROWSER_MOUSE_MOD_1;
        if (g->mouse.state & BROWSER_MOUSE_MOD_2 && !ctrl)
                g->mouse.state ^= BROWSER_MOUSE_MOD_2;
 
        browser_window_mouse_track(g->bw, g->mouse.state, event->x, event->y);
 
        return TRUE;
}
 
/**
 * GTK signal handler for focus-out-event on layout
 *
 * when focus leaves the layout widget ensure the caret is cleared
 */
static gboolean
nsgtk_window_focus_out_event(GtkWidget *widget,
                             GdkEvent *event,
                             gpointer data)
{
        struct gui_window *g = data;
 
        browser_window_remove_caret(g->bw, true);
        return FALSE;
}
 
/**
 * GTK signal handler for button-press-event on layout
 */
static gboolean
nsgtk_window_button_press_event(GtkWidget *widget,
                                GdkEventButton *event,
                                gpointer data)
{
        struct gui_window *g = data;
 
        gtk_im_context_reset(g->input_method);
        gtk_widget_grab_focus(GTK_WIDGET(g->layout));
        nsgtk_local_history_hide();
 
        g->mouse.pressed_x = event->x;
        g->mouse.pressed_y = event->y;
 
        switch (event->button) {
        case 1: /* Left button, usually. Pass to core as BUTTON 1. */
                g->mouse.state = BROWSER_MOUSE_PRESS_1;
                break;
 
        case 2: /* Middle button, usually. Pass to core as BUTTON 2 */
                g->mouse.state = BROWSER_MOUSE_PRESS_2;
                break;
 
        case 3: /* Right button, usually. Action button, context menu. */
                /** \todo determine if hiding the caret here is necessary */
                browser_window_remove_caret(g->bw, true);
                nsgtk_scaffolding_context_menu(g->scaffold,
                                               g->mouse.pressed_x,
                                               g->mouse.pressed_y);
                return TRUE;
 
        case 8: /* Back button */
                g->mouse.state = BROWSER_MOUSE_PRESS_4;
                break;
 
        case 9: /* Forward button */
                g->mouse.state = BROWSER_MOUSE_PRESS_5;
                break;
 
        default:
                return FALSE;
        }
 
        /* Modify for double & triple clicks */
        if (event->type == GDK_3BUTTON_PRESS)
                g->mouse.state |= BROWSER_MOUSE_TRIPLE_CLICK;
        else if (event->type == GDK_2BUTTON_PRESS)
                g->mouse.state |= BROWSER_MOUSE_DOUBLE_CLICK;
 
        /* Handle the modifiers too */
        if (event->state & GDK_SHIFT_MASK)
                g->mouse.state |= BROWSER_MOUSE_MOD_1;
        if (event->state & GDK_CONTROL_MASK)
                g->mouse.state |= BROWSER_MOUSE_MOD_2;
        if (event->state & GDK_MOD1_MASK)
                g->mouse.state |= BROWSER_MOUSE_MOD_3;
 
        /* Record where we pressed, for use when determining whether to start
         * a drag in motion notify events. */
        g->last_x = event->x;
        g->last_y = event->y;
 
        browser_window_mouse_click(g->bw,
                                   g->mouse.state,
                                   g->mouse.pressed_x,
                                   g->mouse.pressed_y);
 
        return TRUE;
}
 
 
static gboolean
nsgtk_window_button_release_event(GtkWidget *widget,
                                  GdkEventButton *event,
                                  gpointer data)
{
        struct gui_window *g = data;
 
        /* If the mouse state is PRESS then we are waiting for a release to emit
         * a click event, otherwise just reset the state to nothing */
        if (g->mouse.state & BROWSER_MOUSE_PRESS_1) {
                g->mouse.state ^= (BROWSER_MOUSE_PRESS_1 | BROWSER_MOUSE_CLICK_1);
        } else if (g->mouse.state & BROWSER_MOUSE_PRESS_2) {
                g->mouse.state ^= (BROWSER_MOUSE_PRESS_2 | BROWSER_MOUSE_CLICK_2);
        } else if (g->mouse.state & BROWSER_MOUSE_PRESS_3) {
                g->mouse.state ^= (BROWSER_MOUSE_PRESS_3 | BROWSER_MOUSE_CLICK_3);
        } else if (g->mouse.state & BROWSER_MOUSE_PRESS_4) {
                g->mouse.state ^= (BROWSER_MOUSE_PRESS_4 | BROWSER_MOUSE_CLICK_4);
        } else if (g->mouse.state & BROWSER_MOUSE_PRESS_5) {
                g->mouse.state ^= (BROWSER_MOUSE_PRESS_5 | BROWSER_MOUSE_CLICK_5);
        }
 
        /* Handle modifiers being removed */
        if (g->mouse.state & BROWSER_MOUSE_MOD_1 &&
            !(event->state & GDK_SHIFT_MASK)) {
                g->mouse.state ^= BROWSER_MOUSE_MOD_1;
        }
        if (g->mouse.state & BROWSER_MOUSE_MOD_2 &&
            !(event->state & GDK_CONTROL_MASK)) {
                g->mouse.state ^= BROWSER_MOUSE_MOD_2;
        }
        if (g->mouse.state & BROWSER_MOUSE_MOD_3 &&
            !(event->state & GDK_MOD1_MASK)) {
                g->mouse.state ^= BROWSER_MOUSE_MOD_2;
        }
 
        if (g->mouse.state & (BROWSER_MOUSE_CLICK_1 |
                              BROWSER_MOUSE_CLICK_2 |
                              BROWSER_MOUSE_CLICK_3 |
                              BROWSER_MOUSE_CLICK_4 |
                              BROWSER_MOUSE_CLICK_5)) {
                browser_window_mouse_click(g->bw, g->mouse.state, event->x, event->y);
        } else {
                browser_window_mouse_track(g->bw, 0, event->x, event->y);
        }
 
        g->mouse.state = 0;
        return TRUE;
}
 
 
static gboolean
nsgtk_window_scroll_event(GtkWidget *widget,
                          GdkEventScroll *event,
                          gpointer data)
{
        struct gui_window *g = data;
        double value;
        double deltax = 0;
        double deltay = 0;
        GtkAdjustment *vscroll = nsgtk_layout_get_vadjustment(g->layout);
        GtkAdjustment *hscroll = nsgtk_layout_get_hadjustment(g->layout);
        GtkAllocation alloc;
 
        switch (event->direction) {
        case GDK_SCROLL_LEFT:
                deltax = -1.0;
                break;
 
        case GDK_SCROLL_UP:
                deltay = -1.0;
                break;
 
        case GDK_SCROLL_RIGHT:
                deltax = 1.0;
                break;
 
        case GDK_SCROLL_DOWN:
                deltay = 1.0;
                break;
 
#if GTK_CHECK_VERSION(3,4,0)
        case GDK_SCROLL_SMOOTH:
                gdk_event_get_scroll_deltas((GdkEvent *)event, &deltax, &deltay);
                break;
#endif
        default:
                NSLOG(netsurf, INFO, "Unhandled mouse scroll direction");
                return TRUE;
        }
 
        deltax *= nsgtk_adjustment_get_step_increment(hscroll);
        deltay *= nsgtk_adjustment_get_step_increment(vscroll);
 
        if (browser_window_scroll_at_point(g->bw,
                                           event->x, event->y,
                                           deltax, deltay) != true) {
 
                /* core did not handle event so change adjustments */
 
                /* Horizontal */
                if (deltax != 0) {
                        value = gtk_adjustment_get_value(hscroll) + deltax;
 
                        /* @todo consider gtk_widget_get_allocated_width() */
                        nsgtk_widget_get_allocation(GTK_WIDGET(g->layout), &alloc);
 
                        if (value > nsgtk_adjustment_get_upper(hscroll) - alloc.width) {
                                value = nsgtk_adjustment_get_upper(hscroll) - alloc.width;
                        }
                        if (value < nsgtk_adjustment_get_lower(hscroll)) {
                                value = nsgtk_adjustment_get_lower(hscroll);
                        }
 
                        gtk_adjustment_set_value(hscroll, value);
                }
 
                /* Vertical */
                if (deltay != 0) {
                        value = gtk_adjustment_get_value(vscroll) + deltay;
 
                        /* @todo consider gtk_widget_get_allocated_height */
                        nsgtk_widget_get_allocation(GTK_WIDGET(g->layout), &alloc);
 
                        if (value > (nsgtk_adjustment_get_upper(vscroll) - alloc.height)) {
                                value = nsgtk_adjustment_get_upper(vscroll) - alloc.height;
                        }
                        if (value < nsgtk_adjustment_get_lower(vscroll)) {
                                value = nsgtk_adjustment_get_lower(vscroll);
                        }
 
                        gtk_adjustment_set_value(vscroll, value);
                }
        }
 
        return TRUE;
}
 
 
static gboolean
nsgtk_window_keypress_event(GtkWidget *widget,
                            GdkEventKey *event,
                            gpointer data)
{
        struct gui_window *g = data;
        uint32_t nskey;
 
        if (gtk_im_context_filter_keypress(g->input_method, event))
                return TRUE;
 
        nskey = gtk_gui_gdkkey_to_nskey(event);
 
        if (browser_window_key_press(g->bw, nskey))
                return TRUE;
 
        if ((event->state & 0x7) != 0)
                return TRUE;
 
        double value;
        GtkAdjustment *vscroll = nsgtk_layout_get_vadjustment(g->layout);
        GtkAdjustment *hscroll = nsgtk_layout_get_hadjustment(g->layout);
        GtkAllocation alloc;
 
        /* @todo consider gtk_widget_get_allocated_width() */
        nsgtk_widget_get_allocation(GTK_WIDGET(g->layout), &alloc);
 
        switch (event->keyval) {
 
        case GDK_KEY(Home):
        case GDK_KEY(KP_Home):
                value = nsgtk_adjustment_get_lower(vscroll);
                gtk_adjustment_set_value(vscroll, value);
                break;
 
        case GDK_KEY(End):
        case GDK_KEY(KP_End):
                value = nsgtk_adjustment_get_upper(vscroll) - alloc.height;
 
                if (value < nsgtk_adjustment_get_lower(vscroll))
                        value = nsgtk_adjustment_get_lower(vscroll);
 
                gtk_adjustment_set_value(vscroll, value);
                break;
 
        case GDK_KEY(Left):
        case GDK_KEY(KP_Left):
                value = gtk_adjustment_get_value(hscroll) -
                        nsgtk_adjustment_get_step_increment(hscroll);
 
                if (value < nsgtk_adjustment_get_lower(hscroll))
                        value = nsgtk_adjustment_get_lower(hscroll);
 
                gtk_adjustment_set_value(hscroll, value);
                break;
 
        case GDK_KEY(Up):
        case GDK_KEY(KP_Up):
                value = gtk_adjustment_get_value(vscroll) -
                        nsgtk_adjustment_get_step_increment(vscroll);
 
                if (value < nsgtk_adjustment_get_lower(vscroll))
                        value = nsgtk_adjustment_get_lower(vscroll);
 
                gtk_adjustment_set_value(vscroll, value);
                break;
 
        case GDK_KEY(Right):
        case GDK_KEY(KP_Right):
                value = gtk_adjustment_get_value(hscroll) +
                        nsgtk_adjustment_get_step_increment(hscroll);
 
                if (value > nsgtk_adjustment_get_upper(hscroll) - alloc.width)
                        value = nsgtk_adjustment_get_upper(hscroll) - alloc.width;
 
                gtk_adjustment_set_value(hscroll, value);
                break;
 
        case GDK_KEY(Down):
        case GDK_KEY(KP_Down):
                value = gtk_adjustment_get_value(vscroll) +
                        nsgtk_adjustment_get_step_increment(vscroll);
 
                if (value > nsgtk_adjustment_get_upper(vscroll) - alloc.height)
                        value = nsgtk_adjustment_get_upper(vscroll) - alloc.height;
 
                gtk_adjustment_set_value(vscroll, value);
                break;
 
        case GDK_KEY(Page_Up):
        case GDK_KEY(KP_Page_Up):
                value = gtk_adjustment_get_value(vscroll) -
                        nsgtk_adjustment_get_page_increment(vscroll);
 
                if (value < nsgtk_adjustment_get_lower(vscroll))
                        value = nsgtk_adjustment_get_lower(vscroll);
 
                gtk_adjustment_set_value(vscroll, value);
                break;
 
        case GDK_KEY(Page_Down):
        case GDK_KEY(KP_Page_Down):
                value = gtk_adjustment_get_value(vscroll) +
                        nsgtk_adjustment_get_page_increment(vscroll);
 
                if (value > nsgtk_adjustment_get_upper(vscroll) - alloc.height)
                        value = nsgtk_adjustment_get_upper(vscroll) - alloc.height;
 
                gtk_adjustment_set_value(vscroll, value);
                break;
 
        default:
                break;
 
        }
 
        return TRUE;
}
 
 
static gboolean
nsgtk_window_keyrelease_event(GtkWidget *widget,
                              GdkEventKey *event,
                              gpointer data)
{
        struct gui_window *g = data;
 
        return gtk_im_context_filter_keypress(g->input_method, event);
}
 
 
static void
nsgtk_window_input_method_commit(GtkIMContext *ctx,
                                 const gchar *str,
                                 gpointer data)
{
        struct gui_window *g = data;
        size_t len = strlen(str), offset = 0;
 
        while (offset < len) {
                uint32_t nskey = utf8_to_ucs4(str + offset, len - offset);
 
                browser_window_key_press(g->bw, nskey);
 
                offset = utf8_next(str, len, offset);
        }
}
 
 
static gboolean
nsgtk_window_size_allocate_event(GtkWidget *widget,
                                 GtkAllocation *allocation,
                                 gpointer data)
{
        struct gui_window *g = data;
 
        browser_window_schedule_reformat(g->bw);
 
        return TRUE;
}
 
 
/**
 * when the pane position is changed update the user option
 *
 * The slightly awkward implementation with the first allocation flag
 * is necessary because the initial window creation does not cause an
 * allocate-event signal so the position value in the pane is incorrect
 * and we cannot know what it should be until after the allocation
 * (which did not generate a signal) is done as the user position is a
 * percentage of pane total width not an absolute value.
 */
static void
nsgtk_paned_notify__position(GObject *gobject, GParamSpec *pspec, gpointer data)
{
        struct gui_window *g = data;
        GtkAllocation pane_alloc;
 
        gtk_widget_get_allocation(GTK_WIDGET(g->paned), &pane_alloc);
 
        if (g->paned_sized == false)
        {
                g->paned_sized = true;
                gtk_paned_set_position(g->paned,
                (nsoption_int(toolbar_status_size) * pane_alloc.width) / 10000);
                return;
        }
 
        nsoption_set_int(toolbar_status_size,
         ((gtk_paned_get_position(g->paned) * 10000) / (pane_alloc.width - 1)));
}
 
 
/**
 * Set status bar / scroll bar proportion according to user option
 *   when pane is resized.
 */
static gboolean
nsgtk_paned_size_allocate_event(GtkWidget *widget,
                                GtkAllocation *allocation,
                                gpointer data)
{
        gtk_paned_set_position(GTK_PANED(widget),
               (nsoption_int(toolbar_status_size) * allocation->width) / 10000);
 
        return TRUE;
}
 
 
/**
 * handler for gtk destroy signal on window container
 *
 * destroy the browsing context as there is will be nothing to display it now
 */
static void window_destroy(GtkWidget *widget, gpointer data)
{
        struct gui_window *gw = data;
 
        browser_window_destroy(gw->bw);
 
        g_object_unref(gw->input_method);
 
        /* free any existing icon */
        if (gw->icon != NULL) {
                g_object_unref(gw->icon);
                gw->icon = NULL;
        }
 
        free(gw);
}
 
 
static struct browser_window *bw_from_gw(void *data)
{
        struct gui_window *gw = data;
        return gw->bw;
}
 
 
static bool get_tool_bar_show(void)
{
        const char *cur_bar_show;
 
        cur_bar_show = nsoption_charp(bar_show);
        if (cur_bar_show != NULL) {
                if (strcmp(cur_bar_show, "menu/tool") == 0) {
                        return true;
                } else if (strcmp(cur_bar_show, "tool") == 0) {
                        return true;
                }
        }
        return false;
}
 
 
/**
 * Make the throbber advance to next frame.
 *
 * scheduled callback to update the throbber
 *
 * \param p The context passed when scheduled.
 */
static void next_throbber_frame(void *p)
{
        struct gui_window *gw = p;
        nserror res;
        GdkPixbuf *pixbuf;
 
        gw->throb_frame++; /* advance to next frame */
 
        res = nsgtk_throbber_get_frame(gw->throb_frame, &pixbuf);
        if (res == NSERROR_BAD_SIZE) {
                gw->throb_frame = 1;
                res = nsgtk_throbber_get_frame(gw->throb_frame, &pixbuf);
        }
 
        if (res == NSERROR_OK) {
                nsgtk_tab_set_icon(gw->container, pixbuf);
                /* only schedule next frame if there are no errors */
                nsgtk_schedule(THROBBER_FRAME_TIME, next_throbber_frame, p);
        }
}
 
 
/**
 * Create and open a gtk container (window or tab) for a browsing context.
 *
 * \param bw The browsing context to create gui_window for.
 * \param existing An existing gui_window, may be NULL
 * \param flags flags to control the container creation
 * \return gui window, or NULL on error
 *
 * If GW_CREATE_CLONE flag is set existing is non-NULL.
 *
 * Front end's gui_window must include a reference to the
 * browser window passed in the bw param.
 */
static struct gui_window *
gui_window_create(struct browser_window *bw,
                  struct gui_window *existing,
                  gui_window_create_flags flags)
{
        struct gui_window *g; /* what is being created to return */
        bool open_in_background = !(flags & GW_CREATE_FOREGROUND);
        GtkBuilder* tab_builder;
        nserror res;
 
        res = nsgtk_builder_new_from_resname("tabcontents", &tab_builder);
        if (res != NSERROR_OK) {
                NSLOG(netsurf, INFO, "Tab contents UI builder init failed");
                return NULL;
        }
 
        gtk_builder_connect_signals(tab_builder, NULL);
 
        g = calloc(1, sizeof(*g));
        if (!g) {
                nsgtk_warning("NoMemory", 0);
                g_object_unref(tab_builder);
                return NULL;
        }
 
        NSLOG(netsurf, INFO, "Creating gui window %p for browser window %p",
              g, bw);
 
        g->bw = bw;
        g->mouse.state = 0;
        g->current_pointer = GUI_POINTER_DEFAULT;
 
        /* attach scaffold */
        if (flags & GW_CREATE_TAB) {
                /* open in new tab, attach to existing scaffold */
                if (existing != NULL) {
                        g->scaffold = existing->scaffold;
                } else {
                        g->scaffold = nsgtk_current_scaffolding();
                }
        } else {
                /* open in new window, create and attach to scaffold */
                g->scaffold = nsgtk_new_scaffolding(g);
        }
        if (g->scaffold == NULL) {
                nsgtk_warning("NoMemory", 0);
                free(g);
                g_object_unref(tab_builder);
                return NULL;
        }
 
        /* Construct our primary elements */
        g->container = GTK_WIDGET(gtk_builder_get_object(tab_builder, "tabBox"));
        g->layout = GTK_LAYOUT(gtk_builder_get_object(tab_builder, "layout"));
        g->grid = GTK_WIDGET(gtk_builder_get_object(tab_builder, "tabContents"));
        g->status_bar = GTK_LABEL(gtk_builder_get_object(tab_builder, "status_bar"));
        g->paned = GTK_PANED(gtk_builder_get_object(tab_builder, "hpaned1"));
        g->input_method = gtk_im_multicontext_new();
 
 
        /* create toolbar */
        res = nsgtk_toolbar_create(tab_builder, bw_from_gw, g,
                                   !!(flags & GW_CREATE_FOCUS_LOCATION),
                                   &g->toolbar);
        if (res != NSERROR_OK) {
                free(g);
                g_object_unref(tab_builder);
                return NULL;
        }
 
        /* local page text search toolbar */
        res = nsgtk_search_create(tab_builder, g->bw, &g->search);
        if (res != NSERROR_OK) {
                free(g);
                g_object_unref(tab_builder);
                return NULL;
        }
 
        /* set a default favicon */
        g_object_ref(favicon_pixbuf);
        g->icon = favicon_pixbuf;
 
        /* add new gui window to global list (push_top) */
        if (window_list) {
                window_list->prev = g;
        }
        g->next = window_list;
        g->prev = NULL;
        window_list = g;
 
        /* set the events we're interested in receiving from the browser's
         * drawing area.
         */
        gtk_widget_add_events(GTK_WIDGET(g->layout),
                                GDK_EXPOSURE_MASK |
                                GDK_LEAVE_NOTIFY_MASK |
                                GDK_BUTTON_PRESS_MASK |
                                GDK_BUTTON_RELEASE_MASK |
                                GDK_POINTER_MOTION_MASK |
                                GDK_POINTER_MOTION_HINT_MASK |
                                GDK_KEY_PRESS_MASK |
                                GDK_KEY_RELEASE_MASK |
                                GDK_SCROLL_MASK);
        nsgtk_widget_set_can_focus(GTK_WIDGET(g->layout), TRUE);
 
        /* set the default background colour of the drawing area to white. */
        nsgtk_widget_override_background_color(GTK_WIDGET(g->layout),
                                               GTK_STATE_FLAG_NORMAL,
                                               0, 0xffff, 0xffff, 0xffff);
 
        nsgtk_connect_draw_event(GTK_WIDGET(g->layout),
                                G_CALLBACK(nsgtk_window_draw_event), g);
 
        /* helper macro to conect signals to callbacks */
#define CONNECT(obj, sig, callback, ptr)                                \
        g_signal_connect(G_OBJECT(obj), (sig), G_CALLBACK(callback), (ptr))
 
        /* layout signals */
        CONNECT(g->layout, "motion-notify-event",
                        nsgtk_window_motion_notify_event, g);
        CONNECT(g->layout, "button-press-event",
                        nsgtk_window_button_press_event, g);
        CONNECT(g->layout, "button-release-event",
                        nsgtk_window_button_release_event, g);
        CONNECT(g->layout, "key-press-event",
                        nsgtk_window_keypress_event, g);
        CONNECT(g->layout, "key-release-event",
                        nsgtk_window_keyrelease_event, g);
        CONNECT(g->layout, "size-allocate",
                        nsgtk_window_size_allocate_event, g);
        CONNECT(g->layout, "scroll-event",
                        nsgtk_window_scroll_event, g);
        CONNECT(g->layout, "focus-out-event",
                        nsgtk_window_focus_out_event, g);
 
        /* status pane signals */
        CONNECT(g->paned, "size-allocate",
                nsgtk_paned_size_allocate_event, g);
 
        CONNECT(g->paned, "notify::position",
                nsgtk_paned_notify__position, g);
 
        /* gtk container destructor */
        CONNECT(g->container, "destroy", window_destroy, g);
 
        /* input method */
        gtk_im_context_set_client_window(g->input_method,
                        nsgtk_layout_get_bin_window(g->layout));
        gtk_im_context_set_use_preedit(g->input_method, FALSE);
 
        /* input method signals */
        CONNECT(g->input_method, "commit",
                nsgtk_window_input_method_commit, g);
 
        /* add the tab container to the scaffold notebook */
        nsgtk_tab_add(g, g->container,
                      open_in_background,
                      messages_get("NewTab"), g->icon);
 
        /* initialy should not be visible */
        nsgtk_search_toggle_visibility(g->search);
 
        /* set toolbar visibility from user option */
        nsgtk_toolbar_show(g->toolbar, get_tool_bar_show());
 
        /* safe to drop the reference to the tab_builder as the container is
         * referenced by the notebook now.
         */
        g_object_unref(tab_builder);
 
        /* Finally we need to focus the location bar if requested */
        if (flags & GW_CREATE_FOCUS_LOCATION) {
                if (nsgtk_window_item_activate(g, OPENLOCATION_BUTTON) != NSERROR_OK) {
                        NSLOG(netsurf, WARNING, "Unable to focus location input");
                }
        }
 
        return g;
}
 
 
static void gui_window_destroy(struct gui_window *gw)
{
        NSLOG(netsurf, INFO, "gui_window: %p", gw);
        assert(gw != NULL);
        assert(gw->bw != NULL);
        NSLOG(netsurf, INFO, "scaffolding: %p", gw->scaffold);
 
        /* kill off any throbber that might be running */
        nsgtk_schedule(-1, next_throbber_frame, gw);
 
        /* remove from window list */
        if (gw->prev) {
                gw->prev->next = gw->next;
        } else {
                window_list = gw->next;
        }
 
        if (gw->next) {
                gw->next->prev = gw->prev;
        }
 
        NSLOG(netsurf, INFO, "window list head: %p", window_list);
}
 
 
/**
 * favicon setting for gtk gui window.
 *
 * \param gw gtk gui window to set favicon on.
 * \param icon A handle to the new favicon content.
 */
static void
gui_window_set_icon(struct gui_window *gw, struct hlcache_handle *icon)
{
        struct bitmap *icon_bitmap = NULL;
 
        /* free any existing icon */
        if (gw->icon != NULL) {
                g_object_unref(gw->icon);
                gw->icon = NULL;
        }
 
        if (icon != NULL) {
                icon_bitmap = content_get_bitmap(icon);
                if (icon_bitmap != NULL) {
                        NSLOG(netsurf, INFO, "Using %p bitmap", icon_bitmap);
                        gw->icon = nsgdk_pixbuf_get_from_surface(icon_bitmap->surface, 16, 16);
                }
        }
 
        if (gw->icon == NULL) {
                NSLOG(netsurf, INFO, "Using default favicon");
                g_object_ref(favicon_pixbuf);
                gw->icon = favicon_pixbuf;
        }
 
        /* only set icon if throbber not running */
        if (gw->throb_frame == 0) {
                nsgtk_tab_set_icon(gw->container, gw->icon);
        }
}
 
 
static bool gui_window_get_scroll(struct gui_window *g, int *sx, int *sy)
{
        GtkAdjustment *vadj = nsgtk_layout_get_vadjustment(g->layout);
        GtkAdjustment *hadj = nsgtk_layout_get_hadjustment(g->layout);
 
        assert(vadj);
        assert(hadj);
 
        *sy = (int)(gtk_adjustment_get_value(vadj));
        *sx = (int)(gtk_adjustment_get_value(hadj));
 
        return true;
}
 
 
static void nsgtk_redraw_caret(struct gui_window *g)
{
        int sx, sy;
 
        if (g->careth == 0)
                return;
 
        gui_window_get_scroll(g, &sx, &sy);
 
        gtk_widget_queue_draw_area(GTK_WIDGET(g->layout),
                        g->caretx - sx, g->carety - sy, 1, g->careth + 1);
 
}
 
 
static void gui_window_remove_caret(struct gui_window *g)
{
        int sx, sy;
        int oh = g->careth;
 
        if (oh == 0)
                return;
 
        g->careth = 0;
 
        gui_window_get_scroll(g, &sx, &sy);
 
        gtk_widget_queue_draw_area(GTK_WIDGET(g->layout),
                        g->caretx - sx, g->carety - sy, 1, oh + 1);
 
}
 
 
/**
 * Invalidates an area of a GTK browser window
 *
 * \param g gui_window
 * \param rect area to redraw or NULL for the entire window area
 * \return NSERROR_OK on success or appropriate error code
 */
static nserror
nsgtk_window_invalidate_area(struct gui_window *g, const struct rect *rect)
{
        int sx, sy;
 
        if (rect == NULL) {
                gtk_widget_queue_draw(GTK_WIDGET(g->layout));
                return NSERROR_OK;
        }
 
        if (!browser_window_has_content(g->bw)) {
                return NSERROR_OK;
        }
 
        gui_window_get_scroll(g, &sx, &sy);
 
        gtk_widget_queue_draw_area(GTK_WIDGET(g->layout),
                                   rect->x0 - sx,
                                   rect->y0 - sy,
                                   rect->x1 - rect->x0,
                                   rect->y1 - rect->y0);
 
        return NSERROR_OK;
}
 
 
static void gui_window_set_status(struct gui_window *g, const char *text)
{
        assert(g);
        assert(g->status_bar);
        gtk_label_set_text(g->status_bar, text);
}
 
 
/**
 * Set the scroll position of a gtk browser window.
 *
 * Scrolls the viewport to ensure the specified rectangle of the
 *   content is shown. The GTK implementation scrolls the contents so
 *   the specified point in the content is at the top of the viewport.
 *
 * \param g gui window to scroll
 * \param rect The rectangle to ensure is shown.
 * \return NSERROR_OK on success or apropriate error code.
 */
static nserror
gui_window_set_scroll(struct gui_window *g, const struct rect *rect)
{
        GtkAdjustment *vadj = nsgtk_layout_get_vadjustment(g->layout);
        GtkAdjustment *hadj = nsgtk_layout_get_hadjustment(g->layout);
        gdouble vlower, vpage, vupper, hlower, hpage, hupper;
        gdouble x = (gdouble)rect->x0;
        gdouble y = (gdouble)rect->y0;
 
        assert(vadj);
        assert(hadj);
 
        g_object_get(vadj, "page-size", &vpage, "lower", &vlower, "upper", &vupper, NULL);
        g_object_get(hadj, "page-size", &hpage, "lower", &hlower, "upper", &hupper, NULL);
 
        if (x < hlower) {
                x = hlower;
        }
        if (x > (hupper - hpage)) {
                x = hupper - hpage;
        }
        if (y < vlower) {
                y = vlower;
        }
        if (y > (vupper - vpage)) {
                y = vupper - vpage;
        }
 
        gtk_adjustment_set_value(vadj, y);
        gtk_adjustment_set_value(hadj, x);
 
        return NSERROR_OK;
}
 
 
static void gui_window_update_extent(struct gui_window *g)
{
        int w, h;
 
        if (browser_window_get_extents(g->bw, true, &w, &h) == NSERROR_OK) {
                gtk_layout_set_size(g->layout, w, h);
                gtk_widget_queue_resize(g->grid);
        }
}
 
 
static void
gui_window_set_pointer(struct gui_window *g, gui_pointer_shape shape)
{
        GdkCursor *cursor = NULL;
        GdkCursorType cursortype;
        bool nullcursor = false;
 
        if (g->current_pointer == shape)
                return;
 
        g->current_pointer = shape;
 
        switch (shape) {
        case GUI_POINTER_POINT:
                cursortype = GDK_HAND2;
                break;
        case GUI_POINTER_CARET:
                cursortype = GDK_XTERM;
                break;
        case GUI_POINTER_UP:
                cursortype = GDK_TOP_SIDE;
                break;
        case GUI_POINTER_DOWN:
                cursortype = GDK_BOTTOM_SIDE;
                break;
        case GUI_POINTER_LEFT:
                cursortype = GDK_LEFT_SIDE;
                break;
        case GUI_POINTER_RIGHT:
                cursortype = GDK_RIGHT_SIDE;
                break;
        case GUI_POINTER_LD:
                cursortype = GDK_BOTTOM_LEFT_CORNER;
                break;
        case GUI_POINTER_RD:
                cursortype = GDK_BOTTOM_RIGHT_CORNER;
                break;
        case GUI_POINTER_LU:
                cursortype = GDK_TOP_LEFT_CORNER;
                break;
        case GUI_POINTER_RU:
                cursortype = GDK_TOP_RIGHT_CORNER;
                break;
        case GUI_POINTER_CROSS:
                cursortype = GDK_CROSS;
                break;
        case GUI_POINTER_MOVE:
                cursortype = GDK_FLEUR;
                break;
        case GUI_POINTER_WAIT:
                cursortype = GDK_WATCH;
                break;
        case GUI_POINTER_HELP:
                cursortype = GDK_QUESTION_ARROW;
                break;
        case GUI_POINTER_MENU:
                cursor = nsgtk_create_menu_cursor();
                nullcursor = true;
                break;
        case GUI_POINTER_PROGRESS:
                /* In reality, this needs to be the funky left_ptr_watch
                 * which we can't do easily yet.
                 */
                cursortype = GDK_WATCH;
                break;
        /* The following we're not sure about */
        case GUI_POINTER_NO_DROP:
        case GUI_POINTER_NOT_ALLOWED:
        case GUI_POINTER_DEFAULT:
        default:
              nullcursor = true;
        }
 
        if (!nullcursor)
                cursor = gdk_cursor_new_for_display(
                                gtk_widget_get_display(
                                        GTK_WIDGET(g->layout)),
                                        cursortype);
        gdk_window_set_cursor(nsgtk_widget_get_window(GTK_WIDGET(g->layout)),
                              cursor);
 
        if (!nullcursor)
                nsgdk_cursor_unref(cursor);
}
 
 
static void
gui_window_place_caret(struct gui_window *g,
                       int x, int y, int height,
                       const struct rect *clip)
{
        nsgtk_redraw_caret(g);
 
        y += 1;
        height -= 1;
 
        if (y < clip->y0) {
                height -= clip->y0 - y;
                y = clip->y0;
        }
 
        if (y + height > clip->y1) {
                height = clip->y1 - y + 1;
        }
 
        g->caretx = x;
        g->carety = y;
        g->careth = height;
 
        nsgtk_redraw_caret(g);
 
        gtk_widget_grab_focus(GTK_WIDGET(g->layout));
}
 
 
/**
 * Find the current dimensions of a GTK browser window content area.
 *
 * \param gw The gui window to measure content area of.
 * \param width receives width of window
 * \param height receives height of window
 * \return NSERROR_OK on sucess and width and height updated
 *          else error code.
 */
static nserror
gui_window_get_dimensions(struct gui_window *gw, int *width, int *height)
{
        GtkAllocation alloc;
 
        /** @todo consider gtk_widget_get_allocated_width() */
        nsgtk_widget_get_allocation(GTK_WIDGET(gw->layout), &alloc);
 
        *width = alloc.width;
        *height = alloc.height;
 
        return NSERROR_OK;
}
 
 
static void gui_window_start_selection(struct gui_window *g)
{
        gtk_widget_grab_focus(GTK_WIDGET(g->layout));
}
 
 
static void
gui_window_create_form_select_menu(struct gui_window *g,
                                   struct form_control *control)
{
        intptr_t item;
        struct form_option *option;
 
        GtkWidget *menu_item;
 
        /* control->data.select.multiple is true if multiple selections
         * are allowable.  We ignore this, as the core handles it for us.
         * Yay. \o/
         */
 
        if (select_menu != NULL) {
                gtk_widget_destroy(select_menu);
        }
 
        select_menu = gtk_menu_new();
        select_menu_control = control;
 
        item = 0;
        option = form_select_get_option(control, item);
        while (option != NULL) {
                NSLOG(netsurf, INFO, "Item %"PRIdPTR" option %p text %s",
                      item, option, option->text);
                menu_item = gtk_check_menu_item_new_with_label(option->text);
                if (option->selected) {
                        gtk_check_menu_item_set_active(
                                GTK_CHECK_MENU_ITEM(menu_item), TRUE);
                }
 
                /*
                 * This casts the item index integer into an integer
                 * the size of a pointer. This allows the callback
                 * parameter to be passed avoiding allocating memory
                 * for a context with a single integer in it.
                 */
                g_signal_connect(menu_item, "toggled",
                        G_CALLBACK(nsgtk_select_menu_clicked), (gpointer)item);
 
                gtk_menu_shell_append(GTK_MENU_SHELL(select_menu), menu_item);
 
                item++;
                option = form_select_get_option(control, item);
        }
 
        gtk_widget_show_all(select_menu);
 
        nsgtk_menu_popup_at_pointer(GTK_MENU(select_menu), NULL);
}
 
 
/**
 * GTK window UI callback when core needs a file selection gadget
 *
 * \param g The gui window on which the gadget has been requested
 */
static void
gui_window_file_gadget_open(struct gui_window *g,
                            struct hlcache_handle *hl,
                            struct form_control *gadget)
{
        GtkWidget *dialog;
 
        dialog = gtk_file_chooser_dialog_new("Select File",
                        nsgtk_scaffolding_window(g->scaffold),
                        GTK_FILE_CHOOSER_ACTION_OPEN,
                        NSGTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
                        NSGTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT,
                        NULL);
 
        NSLOG(netsurf, INFO, "*** open dialog: %p", dialog);
 
        int ret = gtk_dialog_run(GTK_DIALOG(dialog));
        NSLOG(netsurf, INFO, "*** return value: %d", ret);
        if (ret == GTK_RESPONSE_ACCEPT) {
                char *filename;
 
                filename = gtk_file_chooser_get_filename(
                        GTK_FILE_CHOOSER(dialog));
 
                browser_window_set_gadget_filename(g->bw, gadget, filename);
 
                g_free(filename);
        }
 
        gtk_widget_destroy(dialog);
}
 
 
/**
 * handle throbber changing state
 */
static nserror throbber(struct gui_window *gw, bool active)
{
        nsgtk_toolbar_throbber(gw->toolbar, active);
        nsgtk_scaffolding_throbber(gw, active);
        if (active) {
                nsgtk_schedule(THROBBER_FRAME_TIME, next_throbber_frame, gw);
        } else {
                nsgtk_schedule(-1, next_throbber_frame, gw);
                gw->throb_frame = 0;
                /* set tab back to favicon */
                nsgtk_tab_set_icon(gw->container, gw->icon);
        }
        return NSERROR_OK;
}
 
 
/**
 * handle page info changing
 */
static nserror page_info_change(struct gui_window *gw)
{
        nsgtk_toolbar_page_info_change(gw->toolbar);
        return NSERROR_OK;
}
 
/**
 * GTK window UI callback to process miscellaneous events
 *
 * \param gw The window receiving the event.
 * \param event The event code.
 * \return NSERROR_OK when processed ok
 */
static nserror
gui_window_event(struct gui_window *gw, enum gui_window_event event)
{
        switch (event) {
        case GW_EVENT_UPDATE_EXTENT:
                gui_window_update_extent(gw);
                break;
 
        case GW_EVENT_REMOVE_CARET:
                gui_window_remove_caret(gw);
                break;
 
        case GW_EVENT_START_SELECTION:
                gui_window_start_selection(gw);
                break;
 
        case GW_EVENT_START_THROBBER:
                throbber(gw, true);
                break;
 
        case GW_EVENT_STOP_THROBBER:
                throbber(gw, false);
                break;
 
        case GW_EVENT_PAGE_INFO_CHANGE:
                page_info_change(gw);
                break;
 
        default:
                break;
        }
        return NSERROR_OK;
}
 
 
/**
 * GTK window UI callback when core changes the current url
 *
 * \param gw The gui window on which the url has been set.
 * \param url The new url.
 */
static nserror gui_window_set_url(struct gui_window *gw, nsurl *url)
{
        return nsgtk_toolbar_set_url(gw->toolbar, url);
}
 
 
/**
 * GTK window UI callback when core changes the current title
 *
 * \param gw The gui window on which the url has been set.
 * \param url The new url.
 */
static void gui_window_set_title(struct gui_window *gw, const char *title)
{
 
        if ((title != NULL) && (title[0] != '\0')) {
                nsgtk_tab_set_title(gw->container, title);
        }
        nsgtk_scaffolding_set_title(gw, title);
}
 
 
/**
 * GTK UI callback when search provider details are updated.
 *
 * \param name The providers name.
 * \param bitmap The bitmap representing the provider.
 * \return NSERROR_OK on success else error code.
 */
static nserror
gui_search_web_provider_update(const char *name, struct bitmap *bitmap)
{
        struct gui_window *gw;
        GdkPixbuf *pixbuf = NULL;
 
        if (bitmap != NULL) {
                pixbuf = nsgdk_pixbuf_get_from_surface(bitmap->surface, 32, 32);
        }
 
        for (gw = window_list; gw != NULL; gw = gw->next) {
                nsgtk_toolbar_set_websearch_image(gw->toolbar, pixbuf);
        }
 
        if (pixbuf != NULL) {
                g_object_unref(pixbuf);
        }
 
        return NSERROR_OK;
}
 
 
/**
 * GTK frontend web search operation table
 */
static struct gui_search_web_table search_web_table = {
        .provider_update = gui_search_web_provider_update,
};
 
struct gui_search_web_table *nsgtk_search_web_table = &search_web_table;
 
 
/**
 * GTK frontend browser window operation table
 */
static struct gui_window_table window_table = {
        .create = gui_window_create,
        .destroy = gui_window_destroy,
        .invalidate = nsgtk_window_invalidate_area,
        .get_scroll = gui_window_get_scroll,
        .set_scroll = gui_window_set_scroll,
        .get_dimensions = gui_window_get_dimensions,
        .event = gui_window_event,
 
        .set_icon = gui_window_set_icon,
        .set_title = gui_window_set_title,
        .set_status = gui_window_set_status,
        .set_pointer = gui_window_set_pointer,
        .place_caret = gui_window_place_caret,
        .create_form_select_menu = gui_window_create_form_select_menu,
        .file_gadget_open = gui_window_file_gadget_open,
        .set_url = gui_window_set_url,
 
 
};
 
struct gui_window_table *nsgtk_window_table = &window_table;
 
 
/* exported interface documented in window.h */
struct nsgtk_scaffolding *nsgtk_get_scaffold(struct gui_window *g)
{
        return g->scaffold;
}
 
 
/* exported interface documented in window.h */
struct browser_window *nsgtk_get_browser_window(struct gui_window *g)
{
        return g->bw;
}
 
 
/* exported interface documented in window.h */
GtkLayout *nsgtk_window_get_layout(struct gui_window *g)
{
        return g->layout;
}
 
 
/* exported interface documented in window.h */
nserror
nsgtk_window_search_toggle(struct gui_window *gw)
{
        return nsgtk_search_toggle_visibility(gw->search);
}
 
 
/* exported interface documented in window.h */
nserror
nsgtk_window_item_activate(struct gui_window *gw, nsgtk_toolbar_button itemid)
{
        return nsgtk_toolbar_item_activate(gw->toolbar, itemid);
}
 
 
/* exported interface documented in window.h */
void nsgtk_window_destroy_browser(struct gui_window *gw)
{
        /* remove tab */
        gtk_widget_destroy(gw->container);
}
 
 
/* exported interface documented in window.h */
nserror nsgtk_window_update_all(void)
{
        struct gui_window *gw;
        for (gw = window_list; gw != NULL; gw = gw->next) {
                nsgtk_tab_options_changed(nsgtk_scaffolding_notebook(gw->scaffold));
                nsgtk_toolbar_restyle(gw->toolbar);
                nsgtk_search_restyle(gw->search);
                browser_window_schedule_reformat(gw->bw);
        }
        return NSERROR_OK;
}
 
 
/* exported interface documented in window.h */
nserror nsgtk_window_toolbar_show(struct nsgtk_scaffolding *gs, bool show)
{
        struct gui_window *gw;
        for (gw = window_list; gw != NULL; gw = gw->next) {
                if (gw->scaffold == gs) {
                        nsgtk_toolbar_show(gw->toolbar, show);
                }
        }
        return NSERROR_OK;
}
 
 
/* exported interface documented in window.h */
nserror nsgtk_window_toolbar_update(void)
{
        struct gui_window *gw;
        for (gw = window_list; gw != NULL; gw = gw->next) {
                nsgtk_toolbar_update(gw->toolbar);
 
        }
        return NSERROR_OK;
}
 
/* exported interface documented in window.h */
nserror nsgtk_window_position_page_info(struct gui_window *gw,
                                        struct nsgtk_pi_window *win)
{
        return nsgtk_toolbar_position_page_info(gw->toolbar, win);
}
 
/* exported interface documented in window.h */
nserror nsgtk_window_position_local_history(struct gui_window *gw)
{
        return nsgtk_toolbar_position_local_history(gw->toolbar);
}