gtkrange.c

gtk是linux一款强大的夸平台的图形化开发工具

		  break;
		case GTK_SCROLL_STEP_FORWARD:
		  gtk_range_draw_step_forw (range);
		  break;
		}
	    }
	}
      if (pos != GTK_TROUGH_NONE)
	{
	  if (pos == GTK_TROUGH_START)
	    range->adjustment->value = range->adjustment->lower;
	  else if (pos == GTK_TROUGH_END)
	    range->adjustment->value =
	      range->adjustment->upper - range->adjustment->page_size;

	  if (range->old_value != range->adjustment->value)
	    {
	      gtk_signal_emit_by_name (GTK_OBJECT (range->adjustment),
				       "value_changed");

	      gtk_range_slider_update (range);
	      gtk_range_clear_background (range);
	    }
	}
    }
  return return_val;
}

static gint
gtk_range_enter_notify (GtkWidget        *widget,
			GdkEventCrossing *event)
{
  GtkRange *range;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_RANGE (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  range = GTK_RANGE (widget);

  if (event->window == range->trough)
    {
      range->in_child = RANGE_CLASS (range)->trough;
    }
  else if (event->window == range->slider)
    {
      range->in_child = RANGE_CLASS (range)->slider;

      if ((range->click_child == 0) ||
	  (range->click_child == RANGE_CLASS (range)->trough))
	gtk_range_draw_slider (range);
    }
  else if (event->window == range->step_forw)
    {
      range->in_child = RANGE_CLASS (range)->step_forw;

      if ((range->click_child == 0) ||
	  (range->click_child == RANGE_CLASS (range)->trough))
	gtk_range_draw_step_forw (range);
    }
  else if (event->window == range->step_back)
    {
      range->in_child = RANGE_CLASS (range)->step_back;

      if ((range->click_child == 0) ||
	  (range->click_child == RANGE_CLASS (range)->trough))
	gtk_range_draw_step_back (range);
    }

  return FALSE;
}

static gint
gtk_range_leave_notify (GtkWidget        *widget,
			GdkEventCrossing *event)
{
  GtkRange *range;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_RANGE (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  range = GTK_RANGE (widget);

  range->in_child = 0;

  if (event->window == range->trough)
    {
    }
  else if (event->window == range->slider)
    {
      if ((range->click_child == 0) ||
	  (range->click_child == RANGE_CLASS (range)->trough))
	gtk_range_draw_slider (range);
    }
  else if (event->window == range->step_forw)
    {
      if ((range->click_child == 0) ||
	  (range->click_child == RANGE_CLASS (range)->trough))
	gtk_range_draw_step_forw (range);
    }
  else if (event->window == range->step_back)
    {
      if ((range->click_child == 0) ||
	  (range->click_child == RANGE_CLASS (range)->trough))
	gtk_range_draw_step_back (range);
    }

  return FALSE;
}

static gint
gtk_range_focus_in (GtkWidget     *widget,
		    GdkEventFocus *event)
{
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_RANGE (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  GTK_WIDGET_SET_FLAGS (widget, GTK_HAS_FOCUS);
  gtk_widget_draw_focus (widget);

  return FALSE;
}

static gint
gtk_range_focus_out (GtkWidget     *widget,
		     GdkEventFocus *event)
{
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_RANGE (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  GTK_WIDGET_UNSET_FLAGS (widget, GTK_HAS_FOCUS);
  gtk_widget_draw_focus (widget);

  return FALSE;
}

static void
gtk_real_range_draw_trough (GtkRange *range)
{
  g_return_if_fail (range != NULL);
  g_return_if_fail (GTK_IS_RANGE (range));

  if (range->trough)
     {
	gtk_paint_box (GTK_WIDGET (range)->style, range->trough,
		       GTK_STATE_ACTIVE, GTK_SHADOW_IN,
		       NULL, GTK_WIDGET(range), "trough",
		       0, 0, -1, -1);
	if (GTK_WIDGET_HAS_FOCUS (range))
	  gtk_paint_focus (GTK_WIDGET (range)->style,
			  range->trough,
			   NULL, GTK_WIDGET(range), "trough",
			  0, 0, -1, -1);
    }
}

static void
gtk_real_range_draw_slider (GtkRange *range)
{
  GtkStateType state_type;
   
  g_return_if_fail (range != NULL);
  g_return_if_fail (GTK_IS_RANGE (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_box (GTK_WIDGET (range)->style, range->slider,
		     state_type, GTK_SHADOW_OUT,
		     NULL, GTK_WIDGET (range), "slider",
		     0, 0, -1, -1);
    }
}

static gint
gtk_real_range_timer (GtkRange *range)
{
  gint return_val;

  GDK_THREADS_ENTER ();

  return_val = TRUE;
  if (range->click_child == RANGE_CLASS (range)->slider)
    {
      if (range->policy == GTK_UPDATE_DELAYED)
	gtk_signal_emit_by_name (GTK_OBJECT (range->adjustment), "value_changed");
      return_val = FALSE;
    }
  else
    {
      GdkModifierType mods, mask;

      if (!range->timer)
	{
	  return_val = FALSE;
	  if (range->need_timer)
	    range->timer = gtk_timeout_add (SCROLL_TIMER_LENGTH,
					    (GtkFunction) RANGE_CLASS (range)->timer,
					    (gpointer) range);
	  else
	    {
	      GDK_THREADS_LEAVE ();
	      return FALSE;
	    }
	  range->need_timer = FALSE;
	}

      switch (range->button)
	{
	case 1:
	  mask = GDK_BUTTON1_MASK;
	  break;
	case 2:
	  mask = GDK_BUTTON2_MASK;
	  break;
	case 3:
	  mask = GDK_BUTTON3_MASK;
	  break;
	default:
	  mask = 0;
	  break;
	}

      gdk_window_get_pointer (range->slider, NULL, NULL, &mods);

      if (mods & mask)
	return_val = gtk_range_scroll (range, -1);
    }

  GDK_THREADS_LEAVE ();

  return return_val;
}

static gint
gtk_range_scroll (GtkRange *range,
		  gfloat    jump_perc)
{
  gfloat new_value;
  gint return_val;

  g_return_val_if_fail (range != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_RANGE (range), FALSE);

  new_value = range->adjustment->value;
  return_val = TRUE;

  switch (range->scroll_type)
    {
    case GTK_SCROLL_NONE:
      break;
      
    case GTK_SCROLL_JUMP:
      if (jump_perc >= 0 && jump_perc <= 1)
	{
	  new_value = (range->adjustment->lower +
		       (range->adjustment->upper - range->adjustment->page_size -
			range->adjustment->lower) * jump_perc);
	}
      break;
      
    case GTK_SCROLL_STEP_BACKWARD:
      new_value -= range->adjustment->step_increment;
      if (new_value <= range->adjustment->lower)
	{
	  new_value = range->adjustment->lower;
	  return_val = FALSE;
	  range->timer = 0;
	}
      break;

    case GTK_SCROLL_STEP_FORWARD:
      new_value += range->adjustment->step_increment;
      if (new_value >= (range->adjustment->upper - range->adjustment->page_size))
	{
	  new_value = range->adjustment->upper - range->adjustment->page_size;
	  return_val = FALSE;
	  range->timer = 0;
	}
      break;

    case GTK_SCROLL_PAGE_BACKWARD:
      new_value -= range->adjustment->page_increment;
      if (new_value <= range->adjustment->lower)
	{
	  new_value = range->adjustment->lower;
	  return_val = FALSE;
	  range->timer = 0;
	}
      break;

    case GTK_SCROLL_PAGE_FORWARD:
      new_value += range->adjustment->page_increment;
      if (new_value >= (range->adjustment->upper - range->adjustment->page_size))
	{
	  new_value = range->adjustment->upper - range->adjustment->page_size;
	  return_val = FALSE;
	  range->timer = 0;
	}
      break;
    }

  if (new_value != range->adjustment->value)
    {
      range->adjustment->value = new_value;

      if ((range->policy == GTK_UPDATE_CONTINUOUS) ||
	  (!return_val && (range->policy == GTK_UPDATE_DELAYED)))
	{
	  gtk_signal_emit_by_name (GTK_OBJECT (range->adjustment), "value_changed");
	}
      else
	{
	  gtk_range_slider_update (range);
	  gtk_range_clear_background (range);
	}
    }

  return return_val;
}


static void
gtk_range_add_timer (GtkRange *range)
{
  g_return_if_fail (range != NULL);
  g_return_if_fail (GTK_IS_RANGE (range));

  if (!range->timer)
    {
      range->need_timer = TRUE;
      range->timer = gtk_timeout_add (SCROLL_INITIAL_DELAY,
				      (GtkFunction) RANGE_CLASS (range)->timer,
				      (gpointer) range);
    }
}

static void
gtk_range_remove_timer (GtkRange *range)
{
  g_return_if_fail (range != NULL);
  g_return_if_fail (GTK_IS_RANGE (range));

  if (range->timer)
    {
      gtk_timeout_remove (range->timer);
      range->timer = 0;
    }
  range->need_timer = FALSE;
}

static void
gtk_range_adjustment_changed (GtkAdjustment *adjustment,
			      gpointer       data)
{
  GtkRange *range;

  g_return_if_fail (adjustment != NULL);
  g_return_if_fail (data != NULL);

  range = GTK_RANGE (data);

  if (((range->old_lower != adjustment->lower) ||
       (range->old_upper != adjustment->upper) ||
       (range->old_page_size != adjustment->page_size)) &&
      (range->old_value == adjustment->value))
    {
      if ((adjustment->lower == adjustment->upper) ||
	  (range->old_lower == (range->old_upper - range->old_page_size)))
	{
	  adjustment->value = adjustment->lower;
	  gtk_signal_emit_by_name (GTK_OBJECT (adjustment), "value_changed");
	}
    }

  if ((range->old_value != adjustment->value) ||
      (range->old_lower != adjustment->lower) ||
      (range->old_upper != adjustment->upper) ||
      (range->old_page_size != adjustment->page_size))
    {
      gtk_range_slider_update (range);
      gtk_range_clear_background (range);

      range->old_value = adjustment->value;
      range->old_lower = adjustment->lower;
      range->old_upper = adjustment->upper;
      range->old_page_size = adjustment->page_size;
    }
}

static void
gtk_range_adjustment_value_changed (GtkAdjustment *adjustment,
				    gpointer       data)
{
  GtkRange *range;

  g_return_if_fail (adjustment != NULL);
  g_return_if_fail (data != NULL);

  range = GTK_RANGE (data);

  if (range->old_value != adjustment->value)
    {
      gtk_range_slider_update (range);
      gtk_range_clear_background (range);

      range->old_value = adjustment->value;
    }
}


static void
gtk_range_trough_hdims (GtkRange *range,
			gint     *left,
			gint     *right)
{
  gint trough_width;
  gint slider_length;
  gint tmp_width;
  gint tleft;
  gint tright;

  g_return_if_fail (range != NULL);

  gdk_window_get_size (range->trough, &trough_width, NULL);
  gdk_window_get_size (range->slider, &slider_length, NULL);

  tleft = GTK_WIDGET (range)->style->klass->xthickness;
  tright = trough_width - slider_length - GTK_WIDGET (range)->style->klass->xthickness;

  if (range->step_back)
    {
      gdk_window_get_size (range->step_back, &tmp_width, NULL);
      tleft += (tmp_width + RANGE_CLASS (range)->stepper_slider_spacing);
    }

  if (range->step_forw)
    {
      gdk_window_get_size (range->step_forw, &tmp_width, NULL);
      tright -= (tmp_width + RANGE_CLASS (range)->stepper_slider_spacing);
    }

  if (left)
    *left = tleft;
  if (right)
    *right = tright;
}

static void
gtk_range_trough_vdims (GtkRange *range,
			gint     *top,
			gint     *bottom)
{
  gint trough_height;
  gint slider_length;
  gint tmp_height;
  gint ttop;
  gint tbottom;

  g_return_if_fail (range != NULL);

  gdk_window_get_size (range->trough, NULL, &trough_height);
  gdk_window_get_size (range->slider, NULL, &slider_length);

  ttop = GTK_WIDGET (range)->style->klass->ythickness;
  tbottom = trough_height - slider_length - GTK_WIDGET (range)->style->klass->ythickness;

  if (range->step_back)
    {
      gdk_window_get_size (range->step_back, NULL, &tmp_height);
      ttop += (tmp_height + RANGE_CLASS (range)->stepper_slider_spacing);
    }

  if (range->step_forw)
    {
      gdk_window_get_size (range->step_forw, NULL, &tmp_height);
      tbottom -= (tmp_height + RANGE_CLASS (range)->stepper_slider_spacing);
    }

  if (top)
    *top = ttop;
  if (bottom)
    *bottom = tbottom;
}

static void
gtk_range_style_set (GtkWidget *widget,
		      GtkStyle  *previous_style)
{
  GtkRange *range;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_RANGE (widget));

  range = GTK_RANGE (widget);

  if (GTK_WIDGET_REALIZED (widget))
    {
      if (range->trough)
	gtk_style_set_background (widget->style, range->trough, GTK_STATE_ACTIVE);

      if (range->slider)
	gtk_style_set_background (widget->style, range->slider, GTK_STATE_NORMAL);
      
      /* The backgrounds of the step_forw and step_back never actually
       * get drawn in draw calls, so we call gdk_window_clear() here
       * so they get the correct colors. This is a hack. OWT.
       */

      if (range->step_forw)
	{
	  gtk_style_set_background (widget->style, range->step_forw, GTK_STATE_ACTIVE);
	  gdk_window_clear (range->step_forw);
	}

      if (range->step_back)
	{
	  gtk_style_set_background (widget->style, range->step_back, GTK_STATE_ACTIVE);
	  gdk_window_clear (range->step_back);
	}
    }
}