gtkprogressbar.c

gtk是linux一款强大的夸平台的图形化开发工具

{
  GtkProgressBar *pbar;
  GtkWidget *widget;
  gint size;

  pbar = GTK_PROGRESS_BAR (progress);
  widget = GTK_WIDGET (progress);

  /* calculate start pos */

  if (pbar->orientation == GTK_PROGRESS_LEFT_TO_RIGHT ||
      pbar->orientation == GTK_PROGRESS_RIGHT_TO_LEFT)
    {
      size = MAX (2, widget->allocation.width / pbar->activity_blocks);

      if (pbar->orientation == GTK_PROGRESS_LEFT_TO_RIGHT)
	{
	  pbar->activity_pos = widget->style->klass->xthickness;
	  pbar->activity_dir = 0;
	}
      else
	{
	  pbar->activity_pos = widget->allocation.width - 
	    widget->style->klass->xthickness - (widget->allocation.height - 
		widget->style->klass->ythickness * 2);
	  pbar->activity_dir = 1;
	}
    }
  else
    {
      size = MAX (2, widget->allocation.height / pbar->activity_blocks);

      if (pbar->orientation == GTK_PROGRESS_TOP_TO_BOTTOM)
	{
	  pbar->activity_pos = widget->style->klass->ythickness;
	  pbar->activity_dir = 0;
	}
      else
	{
	  pbar->activity_pos = widget->allocation.height -
	    widget->style->klass->ythickness - (widget->allocation.width - 
		widget->style->klass->xthickness * 2);
	  pbar->activity_dir = 1;
	}
    }
}

static void
gtk_progress_bar_paint (GtkProgress *progress)
{
  GtkProgressBar *pbar;
  GtkWidget *widget;
  gint amount;
  gint block_delta = 0;
  gint space = 0;
  gint i;
  gint x;
  gint y;
  gfloat percentage;
  gint size;

  g_return_if_fail (progress != NULL);
  g_return_if_fail (GTK_IS_PROGRESS_BAR (progress));

  pbar = GTK_PROGRESS_BAR (progress);
  widget = GTK_WIDGET (progress);

  if (pbar->orientation == GTK_PROGRESS_LEFT_TO_RIGHT ||
      pbar->orientation == GTK_PROGRESS_RIGHT_TO_LEFT)
    space = widget->allocation.width -
      2 * widget->style->klass->xthickness;
  else
    space = widget->allocation.height -
      2 * widget->style->klass->ythickness;

  percentage = gtk_progress_get_current_percentage (progress);

  if (progress->offscreen_pixmap)
    {
      gtk_paint_box (widget->style,
		     progress->offscreen_pixmap,
		     GTK_STATE_NORMAL, GTK_SHADOW_IN, 
		     NULL, widget, "trough",
		     0, 0,
		     widget->allocation.width,
		     widget->allocation.height);
      
      if (progress->activity_mode)
	{
	  if (pbar->orientation == GTK_PROGRESS_LEFT_TO_RIGHT ||
	      pbar->orientation == GTK_PROGRESS_RIGHT_TO_LEFT)
	    {
	      size = MAX (2, widget->allocation.width / pbar->activity_blocks);
	      
	      gtk_paint_box (widget->style,
			     progress->offscreen_pixmap,
			     GTK_STATE_PRELIGHT, GTK_SHADOW_OUT,
			     NULL, widget, "bar",
			     pbar->activity_pos,
			     widget->style->klass->ythickness,
			     size,
			     widget->allocation.height - widget->style->klass->ythickness * 2);
	      return;
	    }
	  else
	    {
	      size = MAX (2, widget->allocation.height / pbar->activity_blocks);
	      
	      gtk_paint_box (widget->style,
			     progress->offscreen_pixmap,
			     GTK_STATE_PRELIGHT, GTK_SHADOW_OUT,
			     NULL, widget, "bar",
			     widget->style->klass->xthickness,
			     pbar->activity_pos,
			     widget->allocation.width - widget->style->klass->xthickness * 2,
			     size);
	      return;
	    }
	}
      
      amount = percentage * space;
      
      if (amount > 0)
	{
	  switch (pbar->orientation)
	    {
	      
	    case GTK_PROGRESS_LEFT_TO_RIGHT:
	      
	      if (pbar->bar_style == GTK_PROGRESS_CONTINUOUS)
		{
		  gtk_paint_box (widget->style,
				 progress->offscreen_pixmap,
				 GTK_STATE_PRELIGHT, GTK_SHADOW_OUT,
				 NULL, widget, "bar",
				 widget->style->klass->xthickness,
				 widget->style->klass->ythickness,
				 amount,
				 widget->allocation.height - widget->style->klass->ythickness * 2);
		}
	      else
		{
		  x = widget->style->klass->xthickness;
		  
		  for (i = 0; i <= pbar->in_block; i++)
		    {
		      block_delta = (((i + 1) * space) / pbar->blocks)
			- ((i * space) / pbar->blocks);
		      
		      gtk_paint_box (widget->style,
				     progress->offscreen_pixmap,
				     GTK_STATE_PRELIGHT, GTK_SHADOW_OUT,
				     NULL, widget, "bar",
				     x,
				     widget->style->klass->ythickness,
				     block_delta,
				     widget->allocation.height - widget->style->klass->ythickness * 2);
		      
		      x +=  block_delta;
		    }
		}
	      break;
	      
	    case GTK_PROGRESS_RIGHT_TO_LEFT:
	      
	      if (pbar->bar_style == GTK_PROGRESS_CONTINUOUS)
		{
		  gtk_paint_box (widget->style,
				 progress->offscreen_pixmap,
				 GTK_STATE_PRELIGHT, GTK_SHADOW_OUT,
				 NULL, widget, "bar",
				 widget->allocation.width - 
				 widget->style->klass->xthickness - amount,
				 widget->style->klass->ythickness,
				 amount,
				 widget->allocation.height -
				 widget->style->klass->ythickness * 2);
		}
	      else
		{
		  x = widget->allocation.width - 
		    widget->style->klass->xthickness;
		  
		  for (i = 0; i <= pbar->in_block; i++)
		    {
		      block_delta = (((i + 1) * space) / pbar->blocks) -
			((i * space) / pbar->blocks);
		      
		      x -=  block_delta;
		      
		      gtk_paint_box (widget->style,
				     progress->offscreen_pixmap,
				     GTK_STATE_PRELIGHT, GTK_SHADOW_OUT,
				     NULL, widget, "bar",
				     x,
				     widget->style->klass->ythickness,
				     block_delta,
				     widget->allocation.height -
				     widget->style->klass->ythickness * 2);
		    }
		}
	      break;

	    case GTK_PROGRESS_BOTTOM_TO_TOP:

	      if (pbar->bar_style == GTK_PROGRESS_CONTINUOUS)
		{
		  gtk_paint_box (widget->style,
				 progress->offscreen_pixmap,
				 GTK_STATE_PRELIGHT, GTK_SHADOW_OUT,
				 NULL, widget, "bar",
				 widget->style->klass->xthickness,
				 widget->allocation.height - 
				 widget->style->klass->ythickness - amount,
				 widget->allocation.width -
				 widget->style->klass->xthickness * 2,
				 amount);
		}
	      else
		{
		  y = widget->allocation.height - 
		    widget->style->klass->ythickness;
		  
		  for (i = 0; i <= pbar->in_block; i++)
		    {
		      block_delta = (((i + 1) * space) / pbar->blocks) -
			((i * space) / pbar->blocks);
		      
		      y -= block_delta;
		      
		      gtk_paint_box (widget->style,
				     progress->offscreen_pixmap,
				     GTK_STATE_PRELIGHT, GTK_SHADOW_OUT,
				     NULL, widget, "bar",
				     widget->style->klass->xthickness,
				     y,
				     widget->allocation.width - 
				     widget->style->klass->xthickness * 2,
				     block_delta);
		    }
		}
	      break;
	      
	    case GTK_PROGRESS_TOP_TO_BOTTOM:
	      
	      if (pbar->bar_style == GTK_PROGRESS_CONTINUOUS)
		{
		  gtk_paint_box (widget->style,
				 progress->offscreen_pixmap,
				 GTK_STATE_PRELIGHT, GTK_SHADOW_OUT,
				 NULL, widget, "bar",
				 widget->style->klass->xthickness,
				 widget->style->klass->ythickness,
				 widget->allocation.width -
				 widget->style->klass->xthickness * 2,
				 amount);
		}
	      else
		{
		  y = widget->style->klass->ythickness;
		  
		  for (i = 0; i <= pbar->in_block; i++)
		    {
		      
		      block_delta = (((i + 1) * space) / pbar->blocks)
			- ((i * space) / pbar->blocks);
		      
		      gtk_paint_box (widget->style,
				     progress->offscreen_pixmap,
				     GTK_STATE_PRELIGHT, GTK_SHADOW_OUT,
				     NULL, widget, "bar",
				     widget->style->klass->xthickness,
				     y,
				     widget->allocation.width -
				     widget->style->klass->xthickness * 2,
				     block_delta);
		      
		      y += block_delta;
		    }
		}
	      break;
	      
	    default:
	      break;
	    }
	}
      
      if (progress->show_text && pbar->bar_style != GTK_PROGRESS_DISCRETE)
	{
	  gint x;
	  gint y;
	  gchar *buf;
	  GdkRectangle rect;

	  buf = gtk_progress_get_current_text (progress);

	  x = widget->style->klass->xthickness + 1 + 
	    (widget->allocation.width - 2 * widget->style->klass->xthickness -
	     3 - gdk_text_width (widget->style->font, buf, strlen (buf)))
	    * progress->x_align; 

	  y = widget->style->font->ascent + 1 +
	    (widget->allocation.height - 2 * widget->style->klass->ythickness -
	     3 - gdk_text_height (widget->style->font, buf, strlen (buf)))
	    * progress->y_align;

	  rect.x = widget->style->klass->xthickness + 1;
	  rect.y = widget->style->klass->ythickness + 1;
	  rect.width = widget->allocation.width -
	    2 * widget->style->klass->xthickness - 3;
	  rect.height = widget->allocation.height -
	    2 * widget->style->klass->ythickness - 3;

	  gdk_gc_set_clip_rectangle (widget->style->fg_gc[widget->state],
				     &rect);

	  gdk_draw_text (progress->offscreen_pixmap, widget->style->font,
			 widget->style->fg_gc[widget->state],
			 x, y, buf, strlen (buf));

	  gdk_gc_set_clip_rectangle (widget->style->fg_gc[widget->state],
				     NULL);
	  g_free (buf);
 	}
    }
}

/*******************************************************************/

void
gtk_progress_bar_update (GtkProgressBar *pbar,
			 gfloat          percentage)
{
  g_return_if_fail (pbar != NULL);
  g_return_if_fail (GTK_IS_PROGRESS_BAR (pbar));

  /***********************************************************************
   *          Use of gtk_progress_bar_update() is deprecated !	         * 
   * Use gtk_progress_set_value or gtk_progress_set_percentage instead.  *
   ***********************************************************************/

  gtk_progress_set_percentage (GTK_PROGRESS (pbar), percentage);
}

void
gtk_progress_bar_set_orientation (GtkProgressBar           *pbar,
				  GtkProgressBarOrientation orientation)
{
  g_return_if_fail (pbar != NULL);
  g_return_if_fail (GTK_IS_PROGRESS_BAR (pbar));

  if (pbar->orientation != orientation)
    {
      pbar->orientation = orientation;

      if (GTK_WIDGET_DRAWABLE (GTK_WIDGET (pbar)))
	gtk_widget_queue_resize (GTK_WIDGET (pbar));
    }
}

void
gtk_progress_bar_set_bar_style (GtkProgressBar     *pbar,
				GtkProgressBarStyle bar_style)
{
  g_return_if_fail (pbar != NULL);
  g_return_if_fail (GTK_IS_PROGRESS_BAR (pbar));

  if (pbar->bar_style != bar_style)
    {
      pbar->bar_style = bar_style;

      if (GTK_WIDGET_DRAWABLE (GTK_WIDGET (pbar)))
	gtk_widget_queue_resize (GTK_WIDGET (pbar));
    }
}

void
gtk_progress_bar_set_discrete_blocks (GtkProgressBar *pbar,
				      guint           blocks)
{
  g_return_if_fail (pbar != NULL);
  g_return_if_fail (GTK_IS_PROGRESS_BAR (pbar));
  g_return_if_fail (blocks > 1);

  if (pbar->blocks != blocks)
    {
      pbar->blocks = blocks;

      if (GTK_WIDGET_DRAWABLE (GTK_WIDGET (pbar)))
	gtk_widget_queue_resize (GTK_WIDGET (pbar));
    }
}

void
gtk_progress_bar_set_activity_step (GtkProgressBar *pbar,
                                    guint           step)
{
  g_return_if_fail (pbar != NULL);
  g_return_if_fail (GTK_IS_PROGRESS_BAR (pbar));

  if (pbar->activity_step != step)
    pbar->activity_step = step;
}

void
gtk_progress_bar_set_activity_blocks (GtkProgressBar *pbar,
				      guint           blocks)
{
  g_return_if_fail (pbar != NULL);
  g_return_if_fail (GTK_IS_PROGRESS_BAR (pbar));
  g_return_if_fail (blocks > 1);

  if (pbar->activity_blocks != blocks)
    pbar->activity_blocks = blocks;
}