gtkvscrollbar.c

gtk是linux一款强大的夸平台的图形化开发工具

  
  attributes.x = widget->style->klass->ythickness;
  attributes.y = 0;
  attributes.width = RANGE_CLASS (widget)->slider_width;
  attributes.height = RANGE_CLASS (widget)->min_slider_size;
  attributes.event_mask |= (GDK_BUTTON_MOTION_MASK |
                            GDK_POINTER_MOTION_HINT_MASK);
  
  range->slider = gdk_window_new (range->trough, &attributes, attributes_mask);
  
  gtk_vscrollbar_calc_slider_size (GTK_VSCROLLBAR (widget));
  gtk_range_slider_update (GTK_RANGE (widget));
  
  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);
  gdk_window_set_user_data (range->step_forw, widget);
  gdk_window_set_user_data (range->step_back, widget);
  
  gtk_style_set_background (widget->style, range->trough, GTK_STATE_ACTIVE);
  gtk_style_set_background (widget->style, range->slider, GTK_STATE_NORMAL);
  gtk_style_set_background (widget->style, range->step_forw, GTK_STATE_ACTIVE);
  gtk_style_set_background (widget->style, range->step_back, GTK_STATE_ACTIVE);
  
  gdk_window_show (range->slider);
  gdk_window_show (range->step_forw);
  gdk_window_show (range->step_back);
}

static void
gtk_vscrollbar_size_allocate (GtkWidget     *widget,
                              GtkAllocation *allocation)
{
  GtkRange *range;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_VSCROLLBAR (widget));
  g_return_if_fail (allocation != NULL);
  
  widget->allocation = *allocation;
  if (GTK_WIDGET_REALIZED (widget))
    {
      range = GTK_RANGE (widget);
      
      gdk_window_move_resize (range->trough,
                              allocation->x + (allocation->width - widget->requisition.width) / 2,
                              allocation->y,
                              widget->requisition.width, allocation->height);
      gdk_window_move_resize (range->step_back,
                              widget->style->klass->xthickness,
                              widget->style->klass->ythickness,
                              widget->requisition.width - widget->style->klass->xthickness * 2,
                              RANGE_CLASS (widget)->stepper_size);
      gdk_window_move_resize (range->step_forw,
                              widget->style->klass->xthickness,
                              allocation->height - widget->style->klass->ythickness -
                              RANGE_CLASS (widget)->stepper_size,
                              widget->requisition.width - widget->style->klass->xthickness * 2,
                              RANGE_CLASS (widget)->stepper_size);
      gdk_window_resize (range->slider,
                         widget->requisition.width - widget->style->klass->xthickness * 2,
                         RANGE_CLASS (range)->min_slider_size);
      
      gtk_range_slider_update (GTK_RANGE (widget));
    }
}

static void
gtk_vscrollbar_draw_step_forw (GtkRange *range)
{
  GtkStateType state_type;
  GtkShadowType shadow_type;
  
  g_return_if_fail (range != NULL);
  g_return_if_fail (GTK_IS_VSCROLLBAR (range));
  
  if (GTK_WIDGET_DRAWABLE (range))
    {
      if (range->in_child == RANGE_CLASS (range)->step_forw)
        {
          if (range->click_child == RANGE_CLASS (range)->step_forw)
            state_type = GTK_STATE_ACTIVE;
          else
            state_type = GTK_STATE_PRELIGHT;
        }
      else
        state_type = GTK_STATE_NORMAL;
      
      if (range->click_child == RANGE_CLASS (range)->step_forw)
        shadow_type = GTK_SHADOW_IN;
      else
        shadow_type = GTK_SHADOW_OUT;
      
      gtk_paint_arrow (GTK_WIDGET (range)->style, range->step_forw,
                       state_type, shadow_type, 
                       NULL, GTK_WIDGET (range), "vscrollbar",
                       GTK_ARROW_DOWN,
                       TRUE, 0, 0, -1, -1);
    }
}

static void
gtk_vscrollbar_draw_step_back (GtkRange *range)
{
  GtkStateType state_type;
  GtkShadowType shadow_type;
  
  g_return_if_fail (range != NULL);
  g_return_if_fail (GTK_IS_VSCROLLBAR (range));
  
  if (GTK_WIDGET_DRAWABLE (range))
    {
      if (range->in_child == RANGE_CLASS (range)->step_back)
        {
          if (range->click_child == RANGE_CLASS (range)->step_back)
            state_type = GTK_STATE_ACTIVE;
          else
            state_type = GTK_STATE_PRELIGHT;
        }
      else
        state_type = GTK_STATE_NORMAL;
      
      if (range->click_child == RANGE_CLASS (range)->step_back)
        shadow_type = GTK_SHADOW_IN;
      else
        shadow_type = GTK_SHADOW_OUT;
      
      gtk_paint_arrow (GTK_WIDGET (range)->style, range->step_back,
                       state_type, shadow_type, 
                       NULL, GTK_WIDGET (range), "vscrollbar",
                       GTK_ARROW_UP,
                       TRUE, 0, 0, -1, -1);
    }
}

static void
gtk_vscrollbar_slider_update (GtkRange *range)
{
  g_return_if_fail (range != NULL);
  g_return_if_fail (GTK_IS_VSCROLLBAR (range));
  
  gtk_vscrollbar_calc_slider_size (GTK_VSCROLLBAR (range));
  gtk_range_default_vslider_update (range);
}

static void
gtk_vscrollbar_calc_slider_size (GtkVScrollbar *vscrollbar)
{
  GtkRange *range;
  gint step_back_y;
  gint step_back_height;
  gint step_forw_y;
  gint slider_width;
  gint slider_height;
  gint top, bottom;
  gint height;
  
  g_return_if_fail (vscrollbar != NULL);
  g_return_if_fail (GTK_IS_VSCROLLBAR (vscrollbar));
  
  if (GTK_WIDGET_REALIZED (vscrollbar))
    {
      range = GTK_RANGE (vscrollbar);
      
      gdk_window_get_size (range->step_back, NULL, &step_back_height);
      gdk_window_get_position (range->step_back, NULL, &step_back_y);
      gdk_window_get_position (range->step_forw, NULL, &step_forw_y);
      
      top = (step_back_y +
             step_back_height +
             RANGE_CLASS (vscrollbar)->stepper_slider_spacing);
      bottom = step_forw_y - RANGE_CLASS (vscrollbar)->stepper_slider_spacing;
      height = bottom - top;
      
      if ((range->adjustment->page_size > 0) &&
          (range->adjustment->lower != range->adjustment->upper))
        {
          if (range->adjustment->page_size >
              (range->adjustment->upper - range->adjustment->lower))
            range->adjustment->page_size = range->adjustment->upper - range->adjustment->lower;
          
          height = (height * range->adjustment->page_size /
                    (range->adjustment->upper - range->adjustment->lower));
          
          if (height < RANGE_CLASS (vscrollbar)->min_slider_size)
            height = RANGE_CLASS (vscrollbar)->min_slider_size;
        }
      
      gdk_window_get_size (range->slider, &slider_width, &slider_height);
      
      if (slider_height != height)
        gdk_window_resize (range->slider, slider_width, height);
    }
}

static gint
gtk_vscrollbar_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;
      if (key->state & GDK_CONTROL_MASK)
        *pos = GTK_TROUGH_START;
      else
        *scroll = GTK_SCROLL_PAGE_BACKWARD;
      break;
    case GDK_Page_Down:
      return_val = TRUE;
      if (key->state & GDK_CONTROL_MASK)
        *pos = GTK_TROUGH_END;
      else
        *scroll = GTK_SCROLL_PAGE_FORWARD;
      break;
    }
  return return_val;
}