/* GTK - The GIMP Toolkit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-1999.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include <stdio.h>
#include "gtkvscale.h"
#include "gtksignal.h"
#include "gdk/gdkkeysyms.h"


#define SCALE_CLASS(w)  GTK_SCALE_GET_CLASS (w)
#define RANGE_CLASS(w)  GTK_RANGE_GET_CLASS (w)

enum {
  ARG_0,
  ARG_ADJUSTMENT
};

static void gtk_vscale_class_init    (GtkVScaleClass *klass);
static void gtk_vscale_init          (GtkVScale      *vscale);
static void gtk_vscale_set_arg       (GtkObject      *object,
                                      GtkArg         *arg,
                                      guint           arg_id);
static void gtk_vscale_get_arg       (GtkObject      *object,
                                      GtkArg         *arg,
                                      guint           arg_id);
static void gtk_vscale_realize       (GtkWidget      *widget);
static void gtk_vscale_size_request  (GtkWidget      *widget,
                                      GtkRequisition *requisition);
static void gtk_vscale_size_allocate (GtkWidget      *widget,
                                      GtkAllocation  *allocation);
static void gtk_vscale_pos_trough    (GtkVScale      *vscale,
                                      gint           *x,
                                      gint           *y,
                                      gint           *w,
                                      gint           *h);
static void gtk_vscale_pos_background (GtkVScale     *vscale,
                                       gint          *x,
                                       gint          *y,
                                       gint          *w,
                                       gint          *h);
static void gtk_vscale_draw_slider   (GtkRange       *range);
static void gtk_vscale_draw_value    (GtkScale       *scale);
static void gtk_vscale_draw          (GtkWidget      *widget,
                                      GdkRectangle   *area);
static gint gtk_vscale_trough_keys   (GtkRange *range,
                                      GdkEventKey *key,
                                      GtkScrollType *scroll,
                                      GtkTroughType *pos);
static void gtk_vscale_clear_background (GtkRange    *range);

GtkType
gtk_vscale_get_type (void)
{
  static GtkType vscale_type = 0;
  
  if (!vscale_type)
    {
      static const GtkTypeInfo vscale_info =
      {
        "GtkVScale",
        sizeof (GtkVScale),
        sizeof (GtkVScaleClass),
        (GtkClassInitFunc) gtk_vscale_class_init,
        (GtkObjectInitFunc) gtk_vscale_init,
        /* reserved_1 */ NULL,
        /* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL,
      };
      
      vscale_type = gtk_type_unique (GTK_TYPE_SCALE, &vscale_info);
    }
  
  return vscale_type;
}

static void
gtk_vscale_class_init (GtkVScaleClass *class)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
  GtkRangeClass *range_class;
  GtkScaleClass *scale_class;
  
  object_class = (GtkObjectClass*) class;
  widget_class = (GtkWidgetClass*) class;
  range_class = (GtkRangeClass*) class;
  scale_class = (GtkScaleClass*) class;
  
  gtk_object_add_arg_type ("GtkVScale::adjustment",
                           GTK_TYPE_ADJUSTMENT,
                           GTK_ARG_READWRITE,
                           ARG_ADJUSTMENT);
  
  object_class->set_arg = gtk_vscale_set_arg;
  object_class->get_arg = gtk_vscale_get_arg;
  
  widget_class->realize = gtk_vscale_realize;
  widget_class->size_request = gtk_vscale_size_request;
  widget_class->size_allocate = gtk_vscale_size_allocate;
  widget_class->draw = gtk_vscale_draw;
  
  range_class->slider_update = gtk_range_default_vslider_update;
  range_class->trough_click = gtk_range_default_vtrough_click;
  range_class->motion = gtk_range_default_vmotion;
  range_class->draw_slider = gtk_vscale_draw_slider;
  range_class->trough_keys = gtk_vscale_trough_keys;
  range_class->clear_background = gtk_vscale_clear_background;
  
  scale_class->draw_value = gtk_vscale_draw_value;
}

static void
gtk_vscale_set_arg (GtkObject          *object,
                    GtkArg             *arg,
                    guint               arg_id)
{
  GtkVScale *vscale;
  
  vscale = GTK_VSCALE (object);
  
  switch (arg_id)
    {
    case ARG_ADJUSTMENT:
      gtk_range_set_adjustment (GTK_RANGE (vscale), GTK_VALUE_POINTER (*arg));
      break;
    default:
      break;
    }
}

static void
gtk_vscale_get_arg (GtkObject          *object,
                    GtkArg             *arg,
                    guint               arg_id)
{
  GtkVScale *vscale;
  
  vscale = GTK_VSCALE (object);
  
  switch (arg_id)
    {
    case ARG_ADJUSTMENT:
      GTK_VALUE_POINTER (*arg) = GTK_RANGE (vscale);
      break;
    default:
      arg->type = GTK_TYPE_INVALID;
      break;
    }
}

static void
gtk_vscale_init (GtkVScale *vscale)
{
  GTK_WIDGET_SET_FLAGS (vscale, GTK_NO_WINDOW);
}

GtkWidget*
gtk_vscale_new (GtkAdjustment *adjustment)
{
  GtkWidget *vscale;
  
  vscale = gtk_widget_new (GTK_TYPE_VSCALE,
			   "adjustment", adjustment,
			   NULL);
  
  return vscale;
}


static void
gtk_vscale_realize (GtkWidget *widget)
{
  GtkRange *range;
  GdkWindowAttr attributes;
  gint attributes_mask;
  gint x, y, w, h;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_VSCALE (widget));
  
  GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
  range = GTK_RANGE (widget);
  
  widget->window = gtk_widget_get_parent_window (widget);
  gdk_window_ref (widget->window);
  
  gtk_vscale_pos_trough (GTK_VSCALE (widget), &x, &y, &w, &h);
  
  attributes.x = x;
  attributes.y = y;
  attributes.width = w;
  attributes.height = h;
  attributes.wclass = GDK_INPUT_OUTPUT;
  attributes.window_type = GDK_WINDOW_CHILD;
         
  attributes.event_mask = gtk_widget_get_events (widget) | 
    (GDK_EXPOSURE_MASK |
     GDK_BUTTON_PRESS_MASK |
     GDK_BUTTON_RELEASE_MASK |
     GDK_ENTER_NOTIFY_MASK |
     GDK_LEAVE_NOTIFY_MASK);
  attributes.visual = gtk_widget_get_visual (widget);
  attributes.colormap = gtk_widget_get_colormap (widget);
  
  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
  
  range->trough = gdk_window_new (widget->window, &attributes, attributes_mask);
  
  attributes.width = RANGE_CLASS (range)->slider_width;
  attributes.height = SCALE_CLASS (range)->slider_length;
  attributes.event_mask |= (GDK_BUTTON_MOTION_MASK |
                            GDK_POINTER_MOTION_HINT_MASK);
  
  range->slider = gdk_window_new (range->trough, &attributes, attributes_mask);
  
  widget->style = gtk_style_attach (widget->style, widget->window);
  
  gdk_window_set_user_data (range->trough, widget);
  gdk_window_set_user_data (range->slider, widget);
  
  gtk_style_set_background (widget->style, range->trough, GTK_STATE_ACTIVE);
  gtk_style_set_background (widget->style, range->slider, GTK_STATE_NORMAL);
  
  gtk_range_slider_update (GTK_RANGE (widget));
  
  gdk_window_show (range->slider);
}

static void
gtk_vscale_draw (GtkWidget    *widget,
                 GdkRectangle *area)
{
  GtkRange *range;
  GdkRectangle tmp_area;
  GdkRectangle child_area;
  gint x, y, width, height;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_RANGE (widget));
  g_return_if_fail (area != NULL);
  
  if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_MAPPED (widget))
    {
      range = GTK_RANGE (widget);
      
      gtk_vscale_pos_background (GTK_VSCALE (widget), &x, &y, &width, &height);
      
      tmp_area.x = x;
      tmp_area.y = y;
      tmp_area.width = width;
      tmp_area.height = height;
      
      if (gdk_rectangle_intersect (area, &tmp_area, &child_area))
        gtk_range_draw_background (range);
      
      gtk_vscale_pos_trough (GTK_VSCALE (widget), &x, &y, &width, &height);
      
      tmp_area.x = x;
      tmp_area.y = y;
      tmp_area.width = width;
      tmp_area.height = height;
      
      if (gdk_rectangle_intersect (area, &tmp_area, &child_area))
        {
          gtk_range_draw_trough (range);
          gtk_range_draw_slider (range);
          gtk_range_draw_step_forw (range);
          gtk_range_draw_step_back (range);
        }
    }
}

static void
gtk_vscale_clear_background (GtkRange    *range)
{
  GtkWidget *widget;
  GtkScale *scale;
  gint x, y, width, height;
  
  g_return_if_fail (range != NULL);
  g_return_if_fail (GTK_IS_SCALE (range));
  
  widget = GTK_WIDGET (range);
  scale = GTK_SCALE (range);
  
  gtk_vscale_pos_background (GTK_VSCALE (widget), &x, &y, &width, &height);
  
  gtk_widget_queue_clear_area (GTK_WIDGET (range),
                               x, y, width, height);
}

static void
gtk_vscale_size_request (GtkWidget      *widget,
                         GtkRequisition *requisition)
{
  GtkScale *scale;
  gint value_width, value_height;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_VSCALE (widget));
  g_return_if_fail (requisition != NULL);
  
  scale = GTK_SCALE (widget);

  requisition->width = (RANGE_CLASS (scale)->slider_width +
                        widget->style->ythickness * 2);
  requisition->height = (SCALE_CLASS (scale)->slider_length +
                         widget->style->xthickness) * 2;
  
  if (scale->draw_value)
    {
      gtk_scale_get_value_size (scale, &value_width, &value_height);
      
      if ((scale->value_pos == GTK_POS_LEFT) ||
          (scale->value_pos == GTK_POS_RIGHT))
        {
          requisition->width += value_width + SCALE_CLASS (scale)->value_spacing;
          if (requisition->height < (value_height))
            requisition->height = value_height;
        }
      else if ((scale->value_pos == GTK_POS_TOP) ||
               (scale->value_pos == GTK_POS_BOTTOM))
        {
          if (requisition->width < value_width)
            requisition->width = value_width;
          requisition->height += value_height;
        }
    }
}

static void
gtk_vscale_size_allocate (GtkWidget     *widget,
                          GtkAllocation *allocation)
{
  GtkRange *range;
  GtkScale *scale;
  gint width, height;
  gint x, y;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_VSCALE (widget));
  g_return_if_fail (allocation != NULL);
  
  widget->allocation = *allocation;
  if (GTK_WIDGET_REALIZED (widget))
    {
      range = GTK_RANGE (widget);
      scale = GTK_SCALE (widget);
      
      gtk_vscale_pos_trough (GTK_VSCALE (widget), &x, &y, &width, &height);
      
      gdk_window_move_resize (range->trough, x, y, width, height);
      gtk_range_slider_update (GTK_RANGE (widget));
    }
}

static void
gtk_vscale_pos_trough (GtkVScale *vscale,
                       gint      *x,
                       gint      *y,
                       gint      *w,
                       gint      *h)
{
  GtkWidget *widget;
  GtkScale *scale;
  gint value_width, value_height;
  
  g_return_if_fail (vscale != NULL);
  g_return_if_fail (GTK_IS_VSCALE (vscale));
  g_return_if_fail ((x != NULL) && (y != NULL) && (w != NULL) && (h != NULL));
  
  widget = GTK_WIDGET (vscale);
  scale = GTK_SCALE (vscale);
  
  *w = (RANGE_CLASS (scale)->slider_width +
        widget->style->xthickness * 2);
  *h = widget->allocation.height;
  
  if (scale->draw_value)
    {
      *x = 0;
      *y = 0;
      
      gtk_scale_get_value_size (scale, &value_width, &value_height);

      switch (scale->value_pos)
        {
        case GTK_POS_LEFT:
          *x = (value_width + SCALE_CLASS (scale)->value_spacing +
                (widget->allocation.width - widget->requisition.width) / 2);
          break;
        case GTK_POS_RIGHT:
          *x = (widget->allocation.width - widget->requisition.width) / 2;
          break;
        case GTK_POS_TOP:
          *x = (widget->allocation.width - *w) / 2;
          *y = value_height;
          *h -= *y;
          break;
        case GTK_POS_BOTTOM:
          *x = (widget->allocation.width - *w) / 2;
          *h -= value_height;
          break;
        }
    }
  else
    {
      *x = (widget->allocation.width - *w) / 2;
      *y = 0;
    }
  *y += 1;
  *h -= 2;
  
  *x += widget->allocation.x;
  *y += widget->allocation.y;
}

static void
gtk_vscale_pos_background (GtkVScale *vscale,
                           gint      *x,
                           gint      *y,
                           gint      *w,
                           gint      *h)
{
  GtkWidget *widget;
  GtkScale *scale;
  
  gint tx, ty, twidth, theight;
  
  g_return_if_fail (vscale != NULL);
  g_return_if_fail (GTK_IS_VSCALE (vscale));
  g_return_if_fail ((x != NULL) && (y != NULL) && (w != NULL) && (h != NULL));
  
  gtk_vscale_pos_trough (vscale, &tx, &ty, &twidth, &theight);
  
  widget = GTK_WIDGET (vscale);
  scale = GTK_SCALE (vscale);
  
  *x = widget->allocation.x;
  *y = widget->allocation.y;
  *w = widget->allocation.width;
  *h = widget->allocation.height;
  
  switch (scale->value_pos)
    {
    case GTK_POS_LEFT:
      *w -= twidth;
      break;
    case GTK_POS_RIGHT:
      *x += twidth;
      *w -= twidth;
      break;
    case GTK_POS_TOP:
      *h -= theight;
      break;
    case GTK_POS_BOTTOM:
      *y += theight;
      *h -= theight;
      break;
    }
  *w = MAX (*w, 0);
  *h = MAX (*h, 0);
}

static void
gtk_vscale_draw_slider (GtkRange *range)
{
  GtkStateType state_type;
  
  g_return_if_fail (range != NULL);
  g_return_if_fail (GTK_IS_VSCALE (range));
  
  if (range->slider)
    {
      if ((range->in_child == RANGE_CLASS (range)->slider) ||
          (range->click_child == RANGE_CLASS (range)->slider))
        state_type = GTK_STATE_PRELIGHT;
      else
        state_type = GTK_STATE_NORMAL;
      
      gtk_paint_slider (GTK_WIDGET (range)->style, range->slider, state_type, 
			GTK_SHADOW_OUT, 
			NULL, GTK_WIDGET (range), "vscale",
			0, 0, -1, -1, 
			GTK_ORIENTATION_VERTICAL); 
    }
}

static void
gtk_vscale_draw_value (GtkScale *scale)
{
  GtkStateType state_type;
  GtkWidget *widget;
  gchar buffer[32];
  gint width, height;
  gint x, y;
  
  g_return_if_fail (scale != NULL);
  g_return_if_fail (GTK_IS_VSCALE (scale));
  
  widget = GTK_WIDGET (scale);
  
  if (scale->draw_value)
    {
      PangoLayout *layout;
      PangoRectangle logical_rect;
      
      sprintf (buffer, "%0.*f", GTK_RANGE (scale)->digits, GTK_RANGE (scale)->adjustment->value);

      layout = gtk_widget_create_pango_layout (widget, buffer);
      pango_layout_get_pixel_extents (layout, NULL, &logical_rect);

      switch (scale->value_pos)
        {
        case GTK_POS_LEFT:
          gdk_window_get_position (GTK_RANGE (scale)->trough, &x, NULL);
          gdk_window_get_position (GTK_RANGE (scale)->slider, NULL, &y);
          gdk_window_get_size (GTK_RANGE (scale)->trough, &width, NULL);
          gdk_window_get_size (GTK_RANGE (scale)->slider, NULL, &height);
          
          x -= SCALE_CLASS (scale)->value_spacing + logical_rect.width;
          y += widget->allocation.y + (height - logical_rect.height) / 2 +
                                       PANGO_ASCENT (logical_rect);
          break;
        case GTK_POS_RIGHT:
          gdk_window_get_position (GTK_RANGE (scale)->trough, &x, NULL);
          gdk_window_get_position (GTK_RANGE (scale)->slider, NULL, &y);
          gdk_window_get_size (GTK_RANGE (scale)->trough, &width, NULL);
          gdk_window_get_size (GTK_RANGE (scale)->slider, NULL, &height);
          
          x += width + SCALE_CLASS (scale)->value_spacing;
          y += widget->allocation.y + (height - logical_rect.height) / 2 +
                                       PANGO_ASCENT (logical_rect);
          break;
        case GTK_POS_TOP:
          gdk_window_get_position (GTK_RANGE (scale)->trough, &x, &y);
          gdk_window_get_size (GTK_RANGE (scale)->slider, &width, NULL);
          gdk_window_get_size (GTK_RANGE (scale)->trough, NULL, &height);
          
          x += (width - logical_rect.width) / 2;
          y -= PANGO_DESCENT (logical_rect);
          break;
        case GTK_POS_BOTTOM:
          gdk_window_get_position (GTK_RANGE (scale)->trough, &x, &y);
          gdk_window_get_size (GTK_RANGE (scale)->slider, &width, NULL);
          gdk_window_get_size (GTK_RANGE (scale)->trough, NULL, &height);
          
          x += (width - logical_rect.width) / 2;
          y += height + PANGO_ASCENT (logical_rect);
          break;
        }
      
      state_type = GTK_STATE_NORMAL;
      if (!GTK_WIDGET_IS_SENSITIVE (scale))
        state_type = GTK_STATE_INSENSITIVE;

#if 0      
      gtk_paint_string (GTK_WIDGET (scale)->style,
                        GTK_WIDGET (scale)->window,
                        state_type, 
                        NULL, GTK_WIDGET (scale), "vscale",
                        x, y, buffer);
#endif

      gdk_draw_layout (GTK_WIDGET (scale)->window,
		       GTK_WIDGET (scale)->style->fg_gc [state_type],
		       x, y, layout);

      g_object_unref (G_OBJECT (layout));
    }
}

static gint
gtk_vscale_trough_keys (GtkRange *range,
			GdkEventKey *key,
			GtkScrollType *scroll,
			GtkTroughType *pos)
{
  gint return_val = FALSE;
  switch (key->keyval)
    {
    case GDK_Up:
      return_val = TRUE;
      *scroll = GTK_SCROLL_STEP_BACKWARD;
      break;
    case GDK_Down:
      return_val = TRUE;
      *scroll = GTK_SCROLL_STEP_FORWARD;
      break;
    case GDK_Page_Up:
      return_val = TRUE;
      *scroll = GTK_SCROLL_PAGE_BACKWARD;
      break;
    case GDK_Page_Down:
      return_val = TRUE;
      *scroll = GTK_SCROLL_PAGE_FORWARD;
      break;
    case GDK_Home:
      return_val = TRUE;
      *pos = GTK_TROUGH_START;
      break;
    case GDK_End:
      return_val = TRUE;
      *pos = GTK_TROUGH_END;
      break;
    }
  return return_val;
}