/* -*- Mode: C; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2002
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *  Brian Ryner <bryner@brianryner.com>  (Original Author)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/*
 * This file contains painting functions for each of the gtk widgets.
 * Adapted from the gtk+ 1.2.10 source.
 */

#include <gtk/gtk.h>
#include <gdk/gdkprivate.h>
#include <string.h>
#include "gtkdrawing.h"

static GtkWidget* gButtonWidget;
static GtkWidget* gProtoWindow;
static GtkWidget* gCheckboxWidget;
static GtkWidget* gScrollbarWidget;
static GtkWidget* gEntryWidget;
static GtkWidget* gArrowWidget;
static GtkWidget* gDropdownButtonWidget;
static GtkWidget* gHandleBoxWidget;
static GtkWidget* gFrameWidget;
static GtkWidget* gProgressWidget;
static GtkWidget* gTabWidget;
static GtkTooltips* gTooltipWidget;

static style_prop_t style_prop_func;

typedef struct GtkThemeEnginePrivate {
  GtkThemeEngine engine;
  void* library;
  char* name;
} GtkThemeEnginePrivate;

static const char* sDisabledEngines[] = {
  "xeno",   /* xenophilia */
  NULL
};

gint
moz_gtk_enable_style_props(style_prop_t styleGetProp)
{
  style_prop_func = styleGetProp;
  return MOZ_GTK_SUCCESS;
}

static gint
setup_widget_prototype(GtkWidget* widget)
{
  static GtkWidget* protoLayout;

  if (!gProtoWindow) {
    gProtoWindow = gtk_window_new(GTK_WINDOW_POPUP);
    protoLayout = gtk_fixed_new();
    gtk_container_add(GTK_CONTAINER(gProtoWindow), protoLayout);
  }

  gtk_container_add(GTK_CONTAINER(protoLayout), widget);
  gtk_widget_set_rc_style(widget);
  gtk_widget_realize(widget);
  return MOZ_GTK_SUCCESS;
}

static gint
ensure_button_widget()
{
  if (!gButtonWidget) {
    gButtonWidget = gtk_button_new_with_label("M");
    setup_widget_prototype(gButtonWidget);
  }
  return MOZ_GTK_SUCCESS;
}

static gint
ensure_checkbox_widget()
{
  if (!gCheckboxWidget) {
    gCheckboxWidget = gtk_check_button_new_with_label("M");
    setup_widget_prototype(gCheckboxWidget);
  }
  return MOZ_GTK_SUCCESS;
}

static gint
ensure_scrollbar_widget()
{
  if (!gScrollbarWidget) {
    gScrollbarWidget = gtk_vscrollbar_new(NULL);
    setup_widget_prototype(gScrollbarWidget);
  }
  return MOZ_GTK_SUCCESS;
}

static gint
ensure_entry_widget()
{
  if (!gEntryWidget) {
    gEntryWidget = gtk_entry_new();
    setup_widget_prototype(gEntryWidget);
#ifdef _AIX
    /* On AIX, calling gdk_widget_realize on a gtk entry with an
     * input context style of type GDK_IM_STATUS_NOTHING causes a 
     * root status window to come up. It remains up until the widget 
     * is destroyed (which is never in this case). To work around 
     * this problem, we destroy its XIC here to prevent the root 
     * status window from remaining on the screen. */
    if (GTK_EDITABLE(gEntryWidget)->ic &&
        GTK_EDITABLE(gEntryWidget)->ic_attr->style & GDK_IM_STATUS_NOTHING) {
      gdk_ic_destroy(GTK_EDITABLE(gEntryWidget)->ic);
      GTK_EDITABLE(gEntryWidget)->ic = NULL;
    }
#endif
  }
  return MOZ_GTK_SUCCESS;
}

static gint
ensure_arrow_widget()
{
  if (!gArrowWidget) {
    gDropdownButtonWidget = gtk_button_new();
    setup_widget_prototype(gDropdownButtonWidget);
    gArrowWidget = gtk_arrow_new(GTK_ARROW_DOWN, GTK_SHADOW_OUT);
    gtk_container_add(GTK_CONTAINER(gDropdownButtonWidget), gArrowWidget);
    gtk_widget_set_rc_style(gArrowWidget);
    gtk_widget_realize(gArrowWidget);
  }
  return MOZ_GTK_SUCCESS;
}

static gint
ensure_handlebox_widget()
{
  if (!gHandleBoxWidget) {
    gHandleBoxWidget = gtk_handle_box_new();
    setup_widget_prototype(gHandleBoxWidget);
  }
  return MOZ_GTK_SUCCESS;
}

static gint
ensure_tooltip_widget()
{
  if (!gTooltipWidget) {
    gTooltipWidget = gtk_tooltips_new();
    gtk_tooltips_force_window(gTooltipWidget);
    gtk_widget_set_rc_style(gTooltipWidget->tip_window);
    gtk_widget_realize(gTooltipWidget->tip_window);
  }
  return MOZ_GTK_SUCCESS;
}

static gint
ensure_tab_widget()
{
  if (!gTabWidget) {
    gTabWidget = gtk_notebook_new();
    setup_widget_prototype(gTabWidget);
  }
  return MOZ_GTK_SUCCESS;
}

static gint
ensure_progress_widget()
{
  if (!gProgressWidget) {
    gProgressWidget = gtk_progress_bar_new();
    setup_widget_prototype(gProgressWidget);
  }
  return MOZ_GTK_SUCCESS;
}

static gint
ensure_frame_widget()
{
  if (!gFrameWidget) {
    gFrameWidget = gtk_frame_new(NULL);
    setup_widget_prototype(gFrameWidget);
  }
  return MOZ_GTK_SUCCESS;
}

static GtkStateType
ConvertGtkState(GtkWidgetState* state)
{
  if (state->disabled)
    return GTK_STATE_INSENSITIVE;
  else if (state->inHover)
    return (state->active ? GTK_STATE_ACTIVE : GTK_STATE_PRELIGHT);
  else
    return GTK_STATE_NORMAL;
}

static gint
TSOffsetStyleGCArray(GdkGC** gcs, gint xorigin, gint yorigin)
{
  int i;
  /* there are 5 gc's in each array, for each of the widget states */
  for (i = 0; i < 5; ++i)
    gdk_gc_set_ts_origin(gcs[i], xorigin, yorigin);
  return MOZ_GTK_SUCCESS;
}

static gint
TSOffsetStyleGCs(GtkStyle* style, gint xorigin, gint yorigin)
{
  TSOffsetStyleGCArray(style->fg_gc, xorigin, yorigin);
  TSOffsetStyleGCArray(style->bg_gc, xorigin, yorigin);
  TSOffsetStyleGCArray(style->light_gc, xorigin, yorigin);
  TSOffsetStyleGCArray(style->dark_gc, xorigin, yorigin);
  TSOffsetStyleGCArray(style->mid_gc, xorigin, yorigin);
  TSOffsetStyleGCArray(style->text_gc, xorigin, yorigin);
  TSOffsetStyleGCArray(style->base_gc, xorigin, yorigin);
  gdk_gc_set_ts_origin(style->black_gc, xorigin, yorigin);
  gdk_gc_set_ts_origin(style->white_gc, xorigin, yorigin);
  return MOZ_GTK_SUCCESS;
}

static gint
moz_gtk_button_paint(GdkDrawable* drawable, GdkRectangle* rect,
                     GdkRectangle* cliprect, GtkWidgetState* state,
                     GtkReliefStyle relief, GtkWidget* widget)
{
  GtkShadowType shadow_type;
  GtkStyle* style = widget->style;
  gint default_spacing = 7; /* xxx fix me */
  GtkStateType button_state = ConvertGtkState(state);
  gint x = rect->x, y=rect->y, width=rect->width, height=rect->height;

  if (((GdkWindowPrivate*)drawable)->mapped) {
    gdk_window_set_back_pixmap(drawable, NULL, TRUE);
    gdk_window_clear_area(drawable, cliprect->x, cliprect->y, cliprect->width,
                          cliprect->height);
  }

  gtk_widget_set_state(widget, button_state);
  if (state->isDefault) {
    TSOffsetStyleGCs(style, x, y);
    gtk_paint_box(style, drawable, GTK_STATE_NORMAL, GTK_SHADOW_IN, cliprect,
                  widget, "buttondefault", x, y, width, height);
  }

  if (state->canDefault) {
    x += style->klass->xthickness;
    y += style->klass->ythickness;
    width -= 2 * x + default_spacing;
    height -= 2 * y + default_spacing;
    x += (1 + default_spacing) / 2;
    y += (1 + default_spacing) / 2;
  }
       
  if (state->focused) {
    x += 1;
    y += 1;
    width -= 2;
    height -= 2;
  }

  shadow_type = (state->active && state->inHover && !state->disabled) ? GTK_SHADOW_IN : GTK_SHADOW_OUT;

  if (relief != GTK_RELIEF_NONE || (button_state != GTK_STATE_NORMAL &&
                                    button_state != GTK_STATE_INSENSITIVE)) {
    TSOffsetStyleGCs(style, x, y);
    gtk_paint_box(style, drawable, button_state, shadow_type, cliprect,
                  widget, "button", x, y, width, height);
  }

  if (state->focused) {
    x -= 1;
    y -= 1;
    width += 2;
    height += 2;
    
    TSOffsetStyleGCs(style, x, y);
    gtk_paint_focus(style, drawable, cliprect, widget, "button", x, y,
                    width - 1, height - 1);
  }

  return MOZ_GTK_SUCCESS;
}

gint
moz_gtk_init()
{
  /* Check for a blacklisted theme engine */
  GtkThemeEngine* gtkThemeEng;
  ensure_button_widget();
  gtkThemeEng = gButtonWidget->style->engine;
  if (gtkThemeEng) {
    const char* curEngine = ((GtkThemeEnginePrivate*) gtkThemeEng)->name;
    const char* eng;
    int i = 0;
    while ((eng = sDisabledEngines[i++])) {
      if (!strcmp(eng, curEngine)) {
        g_warning("gtkdrawing found unsafe theme engine: %s\n", eng);
        return MOZ_GTK_UNSAFE_THEME;
      }
    }
  }

  return MOZ_GTK_SUCCESS;
}

gint
moz_gtk_checkbox_get_metrics(gint* indicator_size, gint* indicator_spacing)
{
  GtkCheckButtonClass* klass;

  ensure_checkbox_widget();
  klass = GTK_CHECK_BUTTON_CLASS(GTK_OBJECT(gCheckboxWidget)->klass);

  if (style_prop_func) {
    /*
     * This API is supported only in GTK+ >= 1.2.9, and gives per-theme values.
     */

    GtkStyle* style = gCheckboxWidget->style;

    *indicator_size = style_prop_func(style,
                                      "GtkCheckButton::indicator_size",
                                      klass->indicator_size);
    *indicator_spacing = style_prop_func(style,
                                         "GtkCheckButton::indicator_spacing",
                                         klass->indicator_spacing);
  } else {
    *indicator_size = klass->indicator_size;
    *indicator_spacing = klass->indicator_spacing;
  }

  return MOZ_GTK_SUCCESS;
}

gint
moz_gtk_radio_get_metrics(gint* indicator_size, gint* indicator_spacing)
{
  return moz_gtk_checkbox_get_metrics(indicator_size, indicator_spacing);
}

gint
moz_gtk_checkbox_get_focus(gboolean* interior_focus,
                           gint* focus_width, gint* focus_pad)
{
  /* These values are hardcoded in gtk1. */
  *interior_focus = FALSE;
  *focus_width = 1;
  *focus_pad = 0;
  return MOZ_GTK_SUCCESS;
}

gint
moz_gtk_radio_get_focus(gboolean* interior_focus,
                        gint* focus_width, gint* focus_pad)
{
  return moz_gtk_checkbox_get_focus(interior_focus, focus_width, focus_pad);
}

static gint
moz_gtk_toggle_paint(GdkDrawable* drawable, GdkRectangle* rect,
                     GdkRectangle* cliprect, GtkWidgetState* state,
                     gboolean selected, gboolean isradio)
{
  GtkStateType state_type;
  GtkShadowType shadow_type;
  gint indicator_size, indicator_spacing;
  gint x, y, width, height;
  GtkStyle* style;

  moz_gtk_checkbox_get_metrics(&indicator_size, &indicator_spacing);
  style = gCheckboxWidget->style;

  /* offset by indicator_spacing, and centered vertically within the rect */
  x = rect->x + indicator_spacing;
  y = rect->y + (rect->height - indicator_size) / 2;
  width = indicator_size;
  height = indicator_size;
  
  if (selected) {
    state_type = GTK_STATE_ACTIVE;
    shadow_type = GTK_SHADOW_IN;
  }
  else {
    shadow_type = GTK_SHADOW_OUT;
    state_type = ConvertGtkState(state);
  }
  
  TSOffsetStyleGCs(style, x, y);

  /* Some themes check the widget state themselves. */
  gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(gCheckboxWidget), selected);

  if (isradio)
    gtk_paint_option(style, drawable, state_type, shadow_type, cliprect,
                     gCheckboxWidget, "radiobutton", x, y, width, height);
  else
    gtk_paint_check(style, drawable, state_type, shadow_type, cliprect, 
                     gCheckboxWidget, "checkbutton", x, y, width, height);

  return MOZ_GTK_SUCCESS;
}

static gint
calculate_arrow_dimensions(GdkRectangle* rect, GdkRectangle* arrow_rect)
{
  GtkMisc* misc = GTK_MISC(gArrowWidget);

  gint extent = MIN(rect->width - misc->xpad * 2, rect->height - misc->ypad * 2);
  arrow_rect->x = ((rect->x + misc->xpad) * (1.0 - misc->xalign) +
                   (rect->x + rect->width - extent - misc->xpad) * misc->xalign);
  arrow_rect->y = ((rect->y + misc->ypad) * (1.0 - misc->yalign) +
                   (rect->y + rect->height - extent - misc->ypad) * misc->yalign);

  arrow_rect->width = arrow_rect->height = extent;
  return MOZ_GTK_SUCCESS;
}

static gint
moz_gtk_scrollbar_button_paint(GdkDrawable* drawable, GdkRectangle* rect,
                               GdkRectangle* cliprect, GtkWidgetState* state,
                               GtkArrowType type)
{
  GtkStateType state_type = ConvertGtkState(state);
  GtkShadowType shadow_type = (state->active && !state->disabled) ? GTK_SHADOW_IN : GTK_SHADOW_OUT;
  GdkRectangle arrow_rect;
  GtkStyle* style;

  ensure_scrollbar_widget();
  style = gScrollbarWidget->style;

  ensure_arrow_widget();
  calculate_arrow_dimensions(rect, &arrow_rect);
  TSOffsetStyleGCs(style, arrow_rect.x, arrow_rect.y);
  gtk_paint_arrow(style, drawable, state_type, shadow_type, cliprect,
                  gScrollbarWidget, (type < 2) ? "vscrollbar" : "hscrollbar", 
                  type, TRUE, arrow_rect.x, arrow_rect.y, arrow_rect.width,
                  arrow_rect.height);
  return MOZ_GTK_SUCCESS;
}

static gint
moz_gtk_scrollbar_trough_paint(GdkDrawable* drawable, GdkRectangle* rect,
                               GdkRectangle* cliprect, GtkWidgetState* state)
{
  GtkStyle* style;

  ensure_scrollbar_widget();
  style = gScrollbarWidget->style;

  TSOffsetStyleGCs(style, rect->x, rect->y);
  gtk_style_apply_default_background(style, drawable, TRUE, GTK_STATE_ACTIVE,
                                     cliprect, rect->x, rect->y,
                                     rect->width, rect->height);

  gtk_paint_box(style, drawable, GTK_STATE_ACTIVE, GTK_SHADOW_IN, cliprect,
                gScrollbarWidget, "trough", rect->x, rect->y,  rect->width,
                rect->height);

  if (state->focused)
    gtk_paint_focus(style, drawable, cliprect, gScrollbarWidget, "trough",
                    rect->x, rect->y, rect->width, rect->height);

  return MOZ_GTK_SUCCESS;
}

static gint
moz_gtk_scrollbar_thumb_paint(GdkDrawable* drawable, GdkRectangle* rect,
                              GdkRectangle* cliprect, GtkWidgetState* state)
{
  GtkStateType state_type = (state->inHover || state->active) ? GTK_STATE_PRELIGHT : GTK_STATE_NORMAL;
  GtkStyle* style;

  ensure_scrollbar_widget();
  style = gScrollbarWidget->style;

  TSOffsetStyleGCs(style, rect->x, rect->y);
  gtk_paint_box(style, drawable, state_type, GTK_SHADOW_OUT, cliprect,
                gScrollbarWidget, "slider", rect->x, rect->y, rect->width, 
                rect->height);

  return MOZ_GTK_SUCCESS;
}

static gint
moz_gtk_gripper_paint(GdkDrawable* drawable, GdkRectangle* rect,
                      GdkRectangle* cliprect, GtkWidgetState* state)
{
  GtkStateType state_type = ConvertGtkState(state);
  GtkShadowType shadow_type;
  GtkStyle* style;

  ensure_handlebox_widget();
  style = gHandleBoxWidget->style;
  shadow_type = GTK_HANDLE_BOX(gHandleBoxWidget)->shadow_type;

  TSOffsetStyleGCs(style, rect->x, rect->y);
  gtk_paint_box(style, drawable, state_type, shadow_type, cliprect,
                gHandleBoxWidget, "handlebox_bin", rect->x, rect->y,
                rect->width, rect->height);

  return MOZ_GTK_SUCCESS;
}

static gint
moz_gtk_entry_paint(GdkDrawable* drawable, GdkRectangle* rect,
                    GdkRectangle* cliprect, GtkWidgetState* state)
{
  gint x = rect->x, y = rect->y, width = rect->width, height = rect->height;
  GtkStyle* style;

  ensure_entry_widget();
  style = gEntryWidget->style;

  /*
   * gtk+ is able to draw over top of the entry when it gains focus,
   * so the non-focused text border is implicitly already drawn when
   * the entry is drawn in a focused state.
   *
   * Gecko doesn't quite work this way, so always draw the non-focused
   * shadow, then draw the shadow again, inset, if we're focused.
   */

  TSOffsetStyleGCs(style, x, y);
  gtk_paint_shadow(style, drawable, GTK_STATE_NORMAL, GTK_SHADOW_IN, cliprect,
                   gEntryWidget, "entry", x, y, width, height);
  

  if (state->focused) {
      x += 1;
      y += 1;
      width -= 2;
      height -= 2;
      TSOffsetStyleGCs(style, x, y);
      gtk_paint_shadow(style, drawable, GTK_STATE_NORMAL, GTK_SHADOW_IN,
                       cliprect, gEntryWidget, "entry", x, y, width, height);

      TSOffsetStyleGCs(style, rect->x, rect->y);
      gtk_paint_focus(style, drawable,  cliprect, gEntryWidget, "entry",
                      rect->x, rect->y, rect->width - 1, rect->height - 1);
  }

  x = style->klass->xthickness;
  y = style->klass->ythickness;

  TSOffsetStyleGCs(style, rect->x + x, rect->y + y);
  gtk_paint_flat_box(style, drawable, GTK_STATE_NORMAL, GTK_SHADOW_NONE,
                     cliprect, gEntryWidget, "entry_bg",  rect->x + x,
                     rect->y + y, rect->width - 2*x, rect->height - 2*y);

  return MOZ_GTK_SUCCESS;
}

static gint
moz_gtk_dropdown_arrow_paint(GdkDrawable* drawable, GdkRectangle* rect,
                             GdkRectangle* cliprect, GtkWidgetState* state)
{
  GdkRectangle arrow_rect, real_arrow_rect;
  GtkStateType state_type = ConvertGtkState(state);
  GtkShadowType shadow_type = (state->active && !state->disabled) ? GTK_SHADOW_IN : GTK_SHADOW_OUT;
  GtkStyle* style;

  ensure_arrow_widget();
  moz_gtk_button_paint(drawable, rect, cliprect, state, GTK_RELIEF_NORMAL,
                       gDropdownButtonWidget);

  /* This mirrors gtkbutton's child positioning */
  style = gDropdownButtonWidget->style;
  arrow_rect.x = rect->x + 1 + gDropdownButtonWidget->style->klass->xthickness;
  arrow_rect.y = rect->y + 1 + gDropdownButtonWidget->style->klass->ythickness;
  arrow_rect.width = MAX(1, rect->width - (arrow_rect.x - rect->x) * 2);
  arrow_rect.height = MAX(1, rect->height - (arrow_rect.y - rect->y) * 2);

  calculate_arrow_dimensions(&arrow_rect, &real_arrow_rect);
  style = gArrowWidget->style;
  TSOffsetStyleGCs(style, real_arrow_rect.x, real_arrow_rect.y);
  gtk_paint_arrow(style, drawable, state_type, shadow_type, cliprect,
                  gScrollbarWidget, "arrow",  GTK_ARROW_DOWN, TRUE,
                  real_arrow_rect.x, real_arrow_rect.y,
                  real_arrow_rect.width, real_arrow_rect.height);

  return MOZ_GTK_SUCCESS;
}

static gint
moz_gtk_container_paint(GdkDrawable* drawable, GdkRectangle* rect,
                        GdkRectangle* cliprect, GtkWidgetState* state, 
                        gboolean isradio)
{
  GtkStateType state_type = ConvertGtkState(state);
  GtkStyle* style;

  ensure_checkbox_widget();
  style = gCheckboxWidget->style;

  if (state_type != GTK_STATE_NORMAL && state_type != GTK_STATE_PRELIGHT)
    state_type = GTK_STATE_NORMAL;
  
  TSOffsetStyleGCs(style, rect->x, rect->y);

  if (state_type != GTK_STATE_NORMAL) /* this is for drawing a prelight box */
    gtk_paint_flat_box(style, drawable, state_type, GTK_SHADOW_ETCHED_OUT,
                       cliprect, gCheckboxWidget,
                       isradio ? "radiobutton" : "checkbutton",
                       rect->x, rect->y, rect->width, rect->height);

  if (state->focused)
    gtk_paint_focus(style, drawable, cliprect, gCheckboxWidget, "checkbutton",
                    rect->x, rect->y, rect->width - 1, rect->height - 1);

  return MOZ_GTK_SUCCESS;
}

static gint
moz_gtk_toolbar_paint(GdkDrawable* drawable, GdkRectangle* rect,
                      GdkRectangle* cliprect)
{
  GtkStyle* style;

  ensure_handlebox_widget();
  style = gHandleBoxWidget->style;

  TSOffsetStyleGCs(style, rect->x, rect->y);
  if (style->bg_pixmap[GTK_STATE_NORMAL])
    gtk_style_apply_default_background(style, drawable, TRUE, GTK_STATE_NORMAL,
                                       cliprect, rect->x, rect->y,
                                       rect->width, rect->height);
  else
    gtk_paint_box(style, drawable, GTK_STATE_NORMAL, GTK_SHADOW_OUT, cliprect,
                  gHandleBoxWidget, "dockitem_bin",
                  rect->x, rect->y, rect->width, rect->height);

  return MOZ_GTK_SUCCESS;
}

static gint
moz_gtk_tooltip_paint(GdkDrawable* drawable, GdkRectangle* rect,
                      GdkRectangle* cliprect)
{
  GtkStyle* style;

  ensure_tooltip_widget();
  style = gTooltipWidget->tip_window->style;

  TSOffsetStyleGCs(style, rect->x, rect->y);
  gtk_paint_flat_box(style, drawable, GTK_STATE_NORMAL, GTK_SHADOW_OUT,
                     cliprect, gTooltipWidget->tip_window, "tooltip", rect->x,
                     rect->y, rect->width, rect->height);

  return MOZ_GTK_SUCCESS;
}

static gint
moz_gtk_frame_paint(GdkDrawable* drawable, GdkRectangle* rect,
                    GdkRectangle* cliprect)
{
  GtkStyle* style = gProtoWindow->style;

  TSOffsetStyleGCs(style, rect->x, rect->y);
  gtk_paint_flat_box(style, drawable, GTK_STATE_NORMAL, GTK_SHADOW_NONE, NULL,
                     gProtoWindow, "base", rect->x, rect->y, rect->width,
                     rect->height);

  ensure_frame_widget();
  style = gFrameWidget->style;

  TSOffsetStyleGCs(style, rect->x, rect->y);
  gtk_paint_shadow(style, drawable, GTK_STATE_NORMAL, GTK_SHADOW_IN, cliprect,
                   gFrameWidget, "frame", rect->x, rect->y, rect->width,
                   rect->height);

  return MOZ_GTK_SUCCESS;
}

static gint
moz_gtk_progressbar_paint(GdkDrawable* drawable, GdkRectangle* rect,
                          GdkRectangle* cliprect)
{
  GtkStyle* style;

  ensure_progress_widget();
  style = gProgressWidget->style;

  TSOffsetStyleGCs(style, rect->x, rect->y);
  gtk_paint_box(style, drawable, GTK_STATE_NORMAL, GTK_SHADOW_IN,
                cliprect, gProgressWidget, "trough", rect->x, rect->y,
                rect->width, rect->height);

  return MOZ_GTK_SUCCESS;
}

static gint
moz_gtk_progress_chunk_paint(GdkDrawable* drawable, GdkRectangle* rect,
                             GdkRectangle* cliprect)
{
  GtkStyle* style;

  ensure_progress_widget();
  style = gProgressWidget->style;

  TSOffsetStyleGCs(style, rect->x, rect->y);
  gtk_paint_box(style, drawable, GTK_STATE_PRELIGHT, GTK_SHADOW_OUT,
                cliprect, gProgressWidget, "bar", rect->x, rect->y,
                rect->width, rect->height);

  return MOZ_GTK_SUCCESS;
}

static gint
moz_gtk_tab_paint(GdkDrawable* drawable, GdkRectangle* rect,
                  GdkRectangle* cliprect, gint flags)
{
  /*
   * In order to get the correct shadows and highlights, GTK paints tabs
   * right-to-left (end-to-beginning, to be generic), leaving out the
   * active tab, and then paints the current tab once everything else is
   * painted.  In addition, GTK uses a 2-pixel overlap between adjacent tabs
   * (this value is hard-coded in gtknotebook.c).  For purposes of mapping to
   * gecko's frame positions, we put this overlap on the far edge of the frame
   * (i.e., for a horizontal/top tab strip, we shift the left side of each tab
   * 2px to the left, into the neighboring tab's frame rect.  The right 2px
   * of a tab's frame will be referred to as the "overlap area".
   *
   * Since we can't guarantee painting order with gecko, we need to manage
   * the overlap area manually. There are three types of tab boundaries we need
   * to handle:
   *
   * * two non-active tabs: In this case, we just have both tabs paint
   *                        normally.
   *
   * * non-active to active tab: Here, we need the tab on the left to paint
   *                             itself normally, then paint the edge of the
   *                             active tab in its overlap area.
   *
   * * active to non-active tab: In this case, we just have both tabs paint
   *                             normally.
   *
   * We need to make an exception for the first tab - since there is no tab to
   * the left to paint the overlap area, we do _not_ shift the tab left by 2px.
   */

  GtkStyle* style;
  ensure_tab_widget();

  if (!(flags & MOZ_GTK_TAB_FIRST)) {
    rect->x -= 2;
    rect->width += 2;
  }

  style = gTabWidget->style;
  TSOffsetStyleGCs(style, rect->x, rect->y);
  gtk_paint_extension(style, drawable,
                      ((flags & MOZ_GTK_TAB_SELECTED) ? GTK_STATE_NORMAL : GTK_STATE_ACTIVE),
                      GTK_SHADOW_OUT, cliprect, gTabWidget, "tab", rect->x,
                      rect->y, rect->width, rect->height, GTK_POS_BOTTOM);

  if (flags & MOZ_GTK_TAB_BEFORE_SELECTED) {
    gboolean before_selected = ((flags & MOZ_GTK_TAB_BEFORE_SELECTED) != 0);
    cliprect->y -= 2;
    cliprect->height += 2;
    TSOffsetStyleGCs(style, rect->x + rect->width - 2, rect->y - (2 * before_selected));
    gtk_paint_extension(style, drawable, GTK_STATE_NORMAL, GTK_SHADOW_OUT,
                        cliprect, gTabWidget, "tab", rect->x + rect->width - 2,
                        rect->y - (2 * before_selected), rect->width,
                        rect->height + (2 * before_selected), GTK_POS_BOTTOM);
  }

  return MOZ_GTK_SUCCESS;
}

static gint
moz_gtk_tabpanels_paint(GdkDrawable* drawable, GdkRectangle* rect,
                        GdkRectangle* cliprect)
{
  GtkStyle* style;

  ensure_tab_widget();
  style = gTabWidget->style;

  TSOffsetStyleGCs(style, rect->x, rect->y);
  gtk_paint_box(style, drawable, GTK_STATE_NORMAL, GTK_SHADOW_OUT,
                cliprect, gTabWidget, "notebook", rect->x, rect->y,
                rect->width, rect->height);

  return MOZ_GTK_SUCCESS;
}

gint
moz_gtk_get_widget_border(GtkThemeWidgetType widget, gint* xthickness,
                          gint* ythickness)
{
  GtkWidget* w;
  switch (widget) {
  case MOZ_GTK_BUTTON:
    ensure_button_widget();
    w = gButtonWidget;
    break;
  case MOZ_GTK_TOOLBAR:
    ensure_handlebox_widget();
    w = gHandleBoxWidget;
    break;
  case MOZ_GTK_ENTRY:
    ensure_entry_widget();
    w = gEntryWidget;
    break;
  case MOZ_GTK_DROPDOWN_ARROW:
    ensure_arrow_widget();
    w = gDropdownButtonWidget;
    break;
  case MOZ_GTK_TABPANELS:
    ensure_tab_widget();
    w = gTabWidget;
    break;
  case MOZ_GTK_PROGRESSBAR:
    ensure_progress_widget();
    w = gProgressWidget;
    break;
  case MOZ_GTK_FRAME:
    ensure_frame_widget();
    w = gFrameWidget;
    break;
  case MOZ_GTK_CHECKBUTTON_CONTAINER:
  case MOZ_GTK_RADIOBUTTON_CONTAINER:
    ensure_checkbox_widget();
    *xthickness = *ythickness =
      GTK_CONTAINER(gCheckboxWidget)->border_width + 1;

    return MOZ_GTK_SUCCESS;

  case MOZ_GTK_CHECKBUTTON_LABEL:
  case MOZ_GTK_RADIOBUTTON_LABEL:
    *xthickness = *ythickness = 0;
    return MOZ_GTK_SUCCESS;

  case MOZ_GTK_CHECKBUTTON:
  case MOZ_GTK_RADIOBUTTON:
  case MOZ_GTK_SCROLLBAR_BUTTON:
  case MOZ_GTK_SCROLLBAR_TRACK_HORIZONTAL:
  case MOZ_GTK_SCROLLBAR_TRACK_VERTICAL:
  case MOZ_GTK_SCROLLBAR_THUMB_HORIZONTAL:
  case MOZ_GTK_SCROLLBAR_THUMB_VERTICAL:
  case MOZ_GTK_GRIPPER:
  case MOZ_GTK_TOOLTIP:
  case MOZ_GTK_PROGRESS_CHUNK:
  case MOZ_GTK_TAB:
    /* These widgets have no borders, since they are not containers. */
    *xthickness = 0;
    *ythickness = 0;
    return MOZ_GTK_SUCCESS;
  default:
    g_warning("Unsupported widget type: %d", widget);
    return MOZ_GTK_UNKNOWN_WIDGET;
  }

  *xthickness = w->style->klass->xthickness;
  *ythickness = w->style->klass->ythickness;

  return MOZ_GTK_SUCCESS;
}

gint
moz_gtk_get_dropdown_arrow_size(gint* width, gint* height)
{
  ensure_arrow_widget();

  /*
   * First get the border of the dropdown arrow, then add in the requested
   * size of the arrow.  Note that the minimum arrow size is fixed at
   * 11 pixels.
   */

  *width = 2 * (1 + gDropdownButtonWidget->style->klass->xthickness);
  *width += 11 + GTK_MISC(gArrowWidget)->xpad * 2;

  *height = 2 * (1 + gDropdownButtonWidget->style->klass->ythickness);
  *height += 11 + GTK_MISC(gArrowWidget)->ypad * 2;

  return MOZ_GTK_SUCCESS;
}

gint
moz_gtk_get_scrollbar_metrics(MozGtkScrollbarMetrics *metrics)
{
  GtkRangeClass* klass;
  GtkStyle* style;

  ensure_scrollbar_widget();
  klass = GTK_RANGE_CLASS(GTK_OBJECT(gScrollbarWidget)->klass);
  style = gScrollbarWidget->style;

  if (style_prop_func) {
    /*
     * This API is supported only in GTK+ >= 1.2.9, and gives per-theme values.
     */

    metrics->slider_width = style_prop_func(style, "GtkRange::slider_width",
                                            klass->slider_width);

    metrics->trough_border = style_prop_func(style, "GtkRange::trough_border",
                                             style->klass->xthickness);

    metrics->stepper_size = style_prop_func(style, "GtkRange::stepper_size",
                                            klass->stepper_size);

    metrics->stepper_spacing = style_prop_func(style,
                                               "GtkRange::stepper_spacing",
                                               klass->stepper_slider_spacing);
  } else {
    /*
     * This is the older method, which gives per-engine values.
     */

    metrics->slider_width = klass->slider_width;
    metrics->trough_border = style->klass->xthickness;
    metrics->stepper_size = klass->stepper_size;
    metrics->stepper_spacing = klass->stepper_slider_spacing;
  }

  metrics->min_slider_size = klass->min_slider_size;

  return MOZ_GTK_SUCCESS;
}

gint
moz_gtk_widget_paint(GtkThemeWidgetType widget, GdkDrawable* drawable,
                     GdkRectangle* rect, GdkRectangle* cliprect,
                     GtkWidgetState* state, gint flags)
{
  switch (widget) {
  case MOZ_GTK_BUTTON:
    ensure_button_widget();
    return moz_gtk_button_paint(drawable, rect, cliprect, state,
                                (GtkReliefStyle) flags, gButtonWidget);
    break;
  case MOZ_GTK_CHECKBUTTON:
  case MOZ_GTK_RADIOBUTTON:
    return moz_gtk_toggle_paint(drawable, rect, cliprect, state,
                                (gboolean) flags,
                                (widget == MOZ_GTK_RADIOBUTTON));
    break;
  case MOZ_GTK_SCROLLBAR_BUTTON:
    return moz_gtk_scrollbar_button_paint(drawable, rect, cliprect,
                                          state, (GtkArrowType) flags);
    break;
  case MOZ_GTK_SCROLLBAR_TRACK_HORIZONTAL:
  case MOZ_GTK_SCROLLBAR_TRACK_VERTICAL:
    return moz_gtk_scrollbar_trough_paint(drawable, rect, cliprect, state);
    break;
  case MOZ_GTK_SCROLLBAR_THUMB_HORIZONTAL:
  case MOZ_GTK_SCROLLBAR_THUMB_VERTICAL:
    return moz_gtk_scrollbar_thumb_paint(drawable, rect, cliprect, state);
    break;
  case MOZ_GTK_GRIPPER:
    return moz_gtk_gripper_paint(drawable, rect, cliprect, state);
    break;
  case MOZ_GTK_ENTRY:
    return moz_gtk_entry_paint(drawable, rect, cliprect, state);
    break;
  case MOZ_GTK_DROPDOWN_ARROW:
    return moz_gtk_dropdown_arrow_paint(drawable, rect, cliprect, state);
    break;
  case MOZ_GTK_CHECKBUTTON_CONTAINER:
  case MOZ_GTK_RADIOBUTTON_CONTAINER:
    return moz_gtk_container_paint(drawable, rect, cliprect, state,
                                   (widget == MOZ_GTK_RADIOBUTTON_CONTAINER));
    break;
  case MOZ_GTK_TOOLBAR:
    return moz_gtk_toolbar_paint(drawable, rect, cliprect);
    break;
  case MOZ_GTK_TOOLTIP:
    return moz_gtk_tooltip_paint(drawable, rect, cliprect);
    break;
  case MOZ_GTK_FRAME:
    return moz_gtk_frame_paint(drawable, rect, cliprect);
    break;
  case MOZ_GTK_PROGRESSBAR:
    return moz_gtk_progressbar_paint(drawable, rect, cliprect);
    break;
  case MOZ_GTK_PROGRESS_CHUNK:
    return moz_gtk_progress_chunk_paint(drawable, rect, cliprect);
    break;
  case MOZ_GTK_TAB:
    return moz_gtk_tab_paint(drawable, rect, cliprect, flags);
    break;
  case MOZ_GTK_TABPANELS:
    return moz_gtk_tabpanels_paint(drawable, rect, cliprect);
    break;
  case MOZ_GTK_CHECKBUTTON_LABEL:
  case MOZ_GTK_RADIOBUTTON_LABEL:
    /* We only support these so that we can prevent the CSS border
       from being drawn. */
    return MOZ_GTK_SUCCESS;
  default:
    g_warning("Unknown widget type: %d", widget);
  }

  return MOZ_GTK_UNKNOWN_WIDGET;
}

gint
moz_gtk_shutdown()
{
  if (gTooltipWidget)
    gtk_object_unref(GTK_OBJECT(gTooltipWidget));
  /* This will destroy all of our widgets */
  if (gProtoWindow)
    gtk_widget_destroy(gProtoWindow);

  return MOZ_GTK_SUCCESS;
}