gtkrange.c

gtk是linux一款强大的夸平台的图形化开发工具

  xthickness = GTK_WIDGET (range)->style->klass->xthickness;

  gtk_range_trough_vdims (range, &top, &bottom);
  gdk_window_get_size (range->slider, NULL, &slider_length);
  bottom += slider_length;
	      
  if ((x > xthickness) && (y > top))
    {
      gdk_window_get_size (range->trough, &trough_width, &trough_height);

      if ((x < (trough_width - xthickness) && (y < bottom)))
	{
	  if (jump_perc)
	    {
	      *jump_perc = ((gdouble) (y - top)) / ((gdouble) (bottom - top));

	      return GTK_TROUGH_JUMP;
	    }
	  
	  gdk_window_get_position (range->slider, NULL, &slider_y);
	  
	  if (y < slider_y)
	    return GTK_TROUGH_START;
	  else
	    return GTK_TROUGH_END;
	}
    }

  return GTK_TROUGH_NONE;
}

void
gtk_range_default_hmotion (GtkRange *range,
			   gint      xdelta,
			   gint      ydelta)
{
  gdouble old_value;
  gint left, right;
  gint slider_x, slider_y;
  gint new_pos;

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

  range = GTK_RANGE (range);

  gdk_window_get_position (range->slider, &slider_x, &slider_y);
  gtk_range_trough_hdims (range, &left, &right);

  if (left == right)
    return;

  new_pos = slider_x + xdelta;

  if (new_pos < left)
    new_pos = left;
  else if (new_pos > right)
    new_pos = right;

  old_value = range->adjustment->value;
  range->adjustment->value = ((range->adjustment->upper -
			       range->adjustment->lower -
			       range->adjustment->page_size) *
			      (new_pos - left) / (right - left) +
			      range->adjustment->lower);

  if (range->digits >= 0)
    {
      char buffer[64];

      sprintf (buffer, "%0.*f", range->digits, range->adjustment->value);
      sscanf (buffer, "%f", &range->adjustment->value);
    }

  if (old_value != range->adjustment->value)
    {
      if (range->policy == GTK_UPDATE_CONTINUOUS)
	{
	  gtk_signal_emit_by_name (GTK_OBJECT (range->adjustment), "value_changed");
	}
      else
	{
	  gtk_range_slider_update (range);
	  gtk_range_clear_background (range);

	  if (range->policy == GTK_UPDATE_DELAYED)
	    {
	      gtk_range_remove_timer (range);
	      range->timer = gtk_timeout_add (SCROLL_DELAY_LENGTH,
					      (GtkFunction) RANGE_CLASS (range)->timer,
					      (gpointer) range);
	    }
	}
    }
}

void
gtk_range_default_vmotion (GtkRange *range,
			   gint      xdelta,
			   gint      ydelta)
{
  gdouble old_value;
  gint top, bottom;
  gint slider_x, slider_y;
  gint new_pos;

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

  range = GTK_RANGE (range);

  gdk_window_get_position (range->slider, &slider_x, &slider_y);
  gtk_range_trough_vdims (range, &top, &bottom);

  if (bottom == top)
    return;

  new_pos = slider_y + ydelta;

  if (new_pos < top)
    new_pos = top;
  else if (new_pos > bottom)
    new_pos = bottom;

  old_value = range->adjustment->value;
  range->adjustment->value = ((range->adjustment->upper -
			       range->adjustment->lower -
			       range->adjustment->page_size) *
			      (new_pos - top) / (bottom - top) +
			      range->adjustment->lower);

  if (range->digits >= 0)
    {
      char buffer[64];

      sprintf (buffer, "%0.*f", range->digits, range->adjustment->value);
      sscanf (buffer, "%f", &range->adjustment->value);
    }

  if (old_value != range->adjustment->value)
    {
      if (range->policy == GTK_UPDATE_CONTINUOUS)
	{
	  gtk_signal_emit_by_name (GTK_OBJECT (range->adjustment), "value_changed");
	}
      else
	{
	  gtk_range_slider_update (range);
	  gtk_range_clear_background (range);

	  if (range->policy == GTK_UPDATE_DELAYED)
	    {
	      gtk_range_remove_timer (range);
	      range->timer = gtk_timeout_add (SCROLL_DELAY_LENGTH,
					      (GtkFunction) RANGE_CLASS (range)->timer,
					      (gpointer) range);
	    }
	}
    }
}


static void
gtk_range_destroy (GtkObject *object)
{
  GtkRange *range;

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

  range = GTK_RANGE (object);

  if (range->adjustment)
    gtk_signal_disconnect_by_data (GTK_OBJECT (range->adjustment),
				   (gpointer) range);

  (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}

static void
gtk_range_finalize (GtkObject *object)
{
  GtkRange *range;

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

  range = GTK_RANGE (object);

  if (range->adjustment)
    gtk_object_unref (GTK_OBJECT (range->adjustment));

  (* GTK_OBJECT_CLASS (parent_class)->finalize) (object);
}

static void
gtk_range_draw (GtkWidget    *widget,
		GdkRectangle *area)
{
  GtkRange *range;

  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_range_draw_background (range);
      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_range_draw_focus (GtkWidget *widget)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_RANGE (widget));

  if (GTK_WIDGET_DRAWABLE (widget))
    gtk_range_draw_trough (GTK_RANGE (widget));
}

static void
gtk_range_unrealize (GtkWidget *widget)
{
  GtkRange *range;

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

  range = GTK_RANGE (widget);

  if (range->slider)
    {
      gdk_window_set_user_data (range->slider, NULL);
      gdk_window_destroy (range->slider);
      range->slider = NULL;
    }
  if (range->trough)
    {
      gdk_window_set_user_data (range->trough, NULL);
      gdk_window_destroy (range->trough);
      range->trough = NULL;
    }
  if (range->step_forw)
    {
      gdk_window_set_user_data (range->step_forw, NULL);
      gdk_window_destroy (range->step_forw);
      range->step_forw = NULL;
    }
  if (range->step_back)
    {
      gdk_window_set_user_data (range->step_back, NULL);
      gdk_window_destroy (range->step_back);
      range->step_back = NULL;
    }

  if (GTK_WIDGET_CLASS (parent_class)->unrealize)
    (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
}

static gint
gtk_range_expose (GtkWidget      *widget,
		  GdkEventExpose *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)
    {
      /* Don't redraw if we are only exposing the literal trough region.
       * this may not work correctly if someone overrides the default
       * trough-drawing handler. (Probably should really pass another
       * argument - the redrawn area to all the drawing functions)
       */
      gint xt = widget->style->klass->xthickness;
      gint yt = widget->style->klass->ythickness;
      
      if (!((event->area.x >= xt) &&
	    (event->area.y >= yt) &&
	    (event->area.x + event->area.width <= 
	     widget->allocation.width - xt) &&
	    (event->area.y + event->area.height <= 
	     widget->allocation.height - yt)))
	gtk_range_draw_trough (range);
    }
  else if (event->window == widget->window)
    {
      gtk_range_draw_background (range); 
    }
  else if (event->window == range->slider)
    {
      gtk_range_draw_slider (range);
    }
  else if (event->window == range->step_forw)
    {
      gtk_range_draw_step_forw (range);
    }
  else if (event->window == range->step_back)
    {
      gtk_range_draw_step_back (range);
    }
  return FALSE;
}

static gint
gtk_range_button_press (GtkWidget      *widget,
			GdkEventButton *event)
{
  GtkRange *range;
  gint trough_part;
  gfloat jump_perc;

  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);

  if (!GTK_WIDGET_HAS_FOCUS (widget))
    gtk_widget_grab_focus (widget);

  jump_perc = -1;
  range = GTK_RANGE (widget);
  if (range->button == 0)
    {
      gtk_grab_add (widget);

      range->button = event->button;
      range->x_click_point = event->x;
      range->y_click_point = event->y;

      if (event->window == range->trough)
	{
	  range->click_child = RANGE_CLASS (range)->trough;
	  
	  if (range->button == 2)
	    trough_part = gtk_range_trough_click (range, event->x, event->y, &jump_perc);
	  else
	    trough_part = gtk_range_trough_click (range, event->x, event->y, NULL);
	  
	  range->scroll_type = GTK_SCROLL_NONE;
	  if (trough_part == GTK_TROUGH_START)
	    range->scroll_type = GTK_SCROLL_PAGE_BACKWARD;
	  else if (trough_part == GTK_TROUGH_END)
	    range->scroll_type = GTK_SCROLL_PAGE_FORWARD;
	  else if (trough_part == GTK_TROUGH_JUMP &&
		   jump_perc >= 0 && jump_perc <= 1)
	    range->scroll_type = GTK_SCROLL_JUMP;
	  
	  if (range->scroll_type != GTK_SCROLL_NONE)
	    {
	      gtk_range_scroll (range, jump_perc);
	      gtk_range_add_timer (range);
	    }
	}
      else if (event->window == range->slider)
	{
	  range->click_child = RANGE_CLASS (range)->slider;
	  range->scroll_type = GTK_SCROLL_NONE;
	}
      else if (event->window == range->step_forw)
	{
	  range->click_child = RANGE_CLASS (range)->step_forw;
	  range->scroll_type = GTK_SCROLL_STEP_FORWARD;

	  gtk_range_scroll (range, -1);
	  gtk_range_add_timer (range);
	  gtk_range_draw_step_forw (range);
	}
      else if (event->window == range->step_back)
	{
	  range->click_child = RANGE_CLASS (range)->step_back;
	  range->scroll_type = GTK_SCROLL_STEP_BACKWARD;

	  gtk_range_scroll (range, -1);
	  gtk_range_add_timer (range);
	  gtk_range_draw_step_back (range);
	}
    }

  return FALSE;
}

static gint
gtk_range_button_release (GtkWidget      *widget,
			  GdkEventButton *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 (range->button == event->button)
    {
      gtk_grab_remove (widget);

      range->button = 0;
      range->x_click_point = -1;
      range->y_click_point = -1;

      if (range->click_child == RANGE_CLASS (range)->slider)
	{
	  if (range->policy == GTK_UPDATE_DELAYED)
	    gtk_range_remove_timer (range);

	  if ((range->policy != GTK_UPDATE_CONTINUOUS) &&
	      (range->old_value != range->adjustment->value))
	    gtk_signal_emit_by_name (GTK_OBJECT (range->adjustment), "value_changed");
	}
      else if ((range->click_child == RANGE_CLASS (range)->trough) ||
	       (range->click_child == RANGE_CLASS (range)->step_forw) ||
	       (range->click_child == RANGE_CLASS (range)->step_back))
	{
	  gtk_range_remove_timer (range);

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

	  if (range->click_child == RANGE_CLASS (range)->step_forw)
	    {
	      range->click_child = 0;
	      gtk_range_draw_step_forw (range);
	    }
	  else if (range->click_child == RANGE_CLASS (range)->step_back)
	    {
	      range->click_child = 0;
	      gtk_range_draw_step_back (range);
	    }
	}

      range->click_child = 0;
    }

  return FALSE;
}

static gint
gtk_range_motion_notify (GtkWidget      *widget,
			 GdkEventMotion *event)
{
  GtkRange *range;
  GdkModifierType mods;
  gint x, y, mask;

  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 (range->click_child == RANGE_CLASS (range)->slider)
    {
      x = event->x;
      y = event->y;

      if (event->is_hint || (event->window != range->slider))
	gdk_window_get_pointer (range->slider, &x, &y, &mods);

      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;
	}

      if (mods & mask)
	{
	  if (RANGE_CLASS (range)->motion)
	    (* RANGE_CLASS (range)->motion) (range, x - range->x_click_point, y - range->y_click_point);
	}
    }

  return FALSE;
}

static gint
gtk_range_key_press (GtkWidget   *widget,
		     GdkEventKey *event)
{
  GtkRange *range;
  gint return_val;
  GtkScrollType scroll = GTK_SCROLL_NONE;
  GtkTroughType pos = GTK_TROUGH_NONE;

  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);
  return_val = FALSE;

  if (RANGE_CLASS (range)->trough_keys)
    return_val = (* RANGE_CLASS (range)->trough_keys) (range, event, &scroll, &pos);

  if (return_val)
    {
      if (scroll != GTK_SCROLL_NONE)
	{
	  range->scroll_type = scroll;
	  gtk_range_scroll (range, -1);
	  if (range->old_value != range->adjustment->value)
	    {
	      gtk_signal_emit_by_name (GTK_OBJECT (range->adjustment), "value_changed");
	      switch (range->scroll_type)
		{
		case GTK_SCROLL_STEP_BACKWARD:
		  gtk_range_draw_step_back (range);