gtkprogressbar.c

gtk是linux一款强大的夸平台的图形化开发工具

/* 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/. 
 */

#if HAVE_CONFIG_H
#  include <config.h>
#  if STDC_HEADERS
#    include <string.h>
#    include <stdio.h>
#  endif
#else
#  include <stdio.h>
#endif

#include "gtkprogressbar.h"
#include "gtksignal.h"


#define MIN_HORIZONTAL_BAR_WIDTH   150
#define MIN_HORIZONTAL_BAR_HEIGHT  20
#define MIN_VERTICAL_BAR_WIDTH     22
#define MIN_VERTICAL_BAR_HEIGHT    80
#define MAX_TEXT_LENGTH            80
#define TEXT_SPACING               2

enum {
  ARG_0,
  ARG_ADJUSTMENT,
  ARG_ORIENTATION,
  ARG_BAR_STYLE,
  ARG_ACTIVITY_STEP,
  ARG_ACTIVITY_BLOCKS,
  ARG_DISCRETE_BLOCKS
};

static void gtk_progress_bar_class_init    (GtkProgressBarClass *klass);
static void gtk_progress_bar_init          (GtkProgressBar      *pbar);
static void gtk_progress_bar_set_arg       (GtkObject           *object,
					    GtkArg              *arg,
					    guint                arg_id);
static void gtk_progress_bar_get_arg       (GtkObject           *object,
					    GtkArg              *arg,
					    guint                arg_id);
static void gtk_progress_bar_size_request  (GtkWidget           *widget,
					    GtkRequisition      *requisition);
static void gtk_progress_bar_real_update   (GtkProgress         *progress);
static void gtk_progress_bar_paint         (GtkProgress         *progress);
static void gtk_progress_bar_act_mode_enter (GtkProgress        *progress);


GtkType
gtk_progress_bar_get_type (void)
{
  static GtkType progress_bar_type = 0;

  if (!progress_bar_type)
    {
      static const GtkTypeInfo progress_bar_info =
      {
	"GtkProgressBar",
	sizeof (GtkProgressBar),
	sizeof (GtkProgressBarClass),
	(GtkClassInitFunc) gtk_progress_bar_class_init,
	(GtkObjectInitFunc) gtk_progress_bar_init,
        /* reserved_1 */ NULL,
        /* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL
      };

      progress_bar_type = gtk_type_unique (GTK_TYPE_PROGRESS, &progress_bar_info);
    }

  return progress_bar_type;
}

static void
gtk_progress_bar_class_init (GtkProgressBarClass *class)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
  GtkProgressClass *progress_class;
  
  object_class = (GtkObjectClass *) class;
  widget_class = (GtkWidgetClass *) class;
  progress_class = (GtkProgressClass *) class;
  
  gtk_object_add_arg_type ("GtkProgressBar::adjustment",
			   GTK_TYPE_ADJUSTMENT,
			   GTK_ARG_READWRITE | GTK_ARG_CONSTRUCT,
			   ARG_ADJUSTMENT);
  gtk_object_add_arg_type ("GtkProgressBar::orientation",
			   GTK_TYPE_PROGRESS_BAR_ORIENTATION,
			   GTK_ARG_READWRITE,
			   ARG_ORIENTATION);
  gtk_object_add_arg_type ("GtkProgressBar::bar_style",
			   GTK_TYPE_PROGRESS_BAR_STYLE,
			   GTK_ARG_READWRITE,
			   ARG_BAR_STYLE);
  gtk_object_add_arg_type ("GtkProgressBar::activity_step",
			   GTK_TYPE_UINT,
			   GTK_ARG_READWRITE,
			   ARG_ACTIVITY_STEP);
  gtk_object_add_arg_type ("GtkProgressBar::activity_blocks",
			   GTK_TYPE_UINT,
			   GTK_ARG_READWRITE,
			   ARG_ACTIVITY_BLOCKS);
  gtk_object_add_arg_type ("GtkProgressBar::discrete_blocks",
			   GTK_TYPE_UINT,
			   GTK_ARG_READWRITE,
			   ARG_DISCRETE_BLOCKS);

  object_class->set_arg = gtk_progress_bar_set_arg;
  object_class->get_arg = gtk_progress_bar_get_arg;

  widget_class->size_request = gtk_progress_bar_size_request;

  progress_class->paint = gtk_progress_bar_paint;
  progress_class->update = gtk_progress_bar_real_update;
  progress_class->act_mode_enter = gtk_progress_bar_act_mode_enter;
}

static void
gtk_progress_bar_init (GtkProgressBar *pbar)
{
  pbar->bar_style = GTK_PROGRESS_CONTINUOUS;
  pbar->blocks = 10;
  pbar->in_block = -1;
  pbar->orientation = GTK_PROGRESS_LEFT_TO_RIGHT;
  pbar->activity_pos = 0;
  pbar->activity_dir = 1;
  pbar->activity_step = 3;
  pbar->activity_blocks = 5;
}

static void
gtk_progress_bar_set_arg (GtkObject           *object,
			  GtkArg              *arg,
			  guint                arg_id)
{
  GtkProgressBar *pbar;

  pbar = GTK_PROGRESS_BAR (object);

  switch (arg_id)
    {
    case ARG_ADJUSTMENT:
      gtk_progress_set_adjustment (GTK_PROGRESS (pbar), GTK_VALUE_POINTER (*arg));
      break;
    case ARG_ORIENTATION:
      gtk_progress_bar_set_orientation (pbar, GTK_VALUE_ENUM (*arg));
      break;
    case ARG_BAR_STYLE:
      gtk_progress_bar_set_bar_style (pbar, GTK_VALUE_ENUM (*arg));
      break;
    case ARG_ACTIVITY_STEP:
      gtk_progress_bar_set_activity_step (pbar, GTK_VALUE_UINT (*arg));
      break;
    case ARG_ACTIVITY_BLOCKS:
      gtk_progress_bar_set_activity_blocks (pbar, GTK_VALUE_UINT (*arg));
      break;
    case ARG_DISCRETE_BLOCKS:
      gtk_progress_bar_set_discrete_blocks (pbar, GTK_VALUE_UINT (*arg));
      break;
    default:
      break;
    }
}

static void
gtk_progress_bar_get_arg (GtkObject           *object,
			  GtkArg              *arg,
			  guint                arg_id)
{
  GtkProgressBar *pbar;

  pbar = GTK_PROGRESS_BAR (object);

  switch (arg_id)
    {
    case ARG_ADJUSTMENT:
      GTK_VALUE_POINTER (*arg) = GTK_PROGRESS (pbar)->adjustment;
      break;
    case ARG_ORIENTATION:
      GTK_VALUE_ENUM (*arg) = pbar->orientation;
      break;
    case ARG_BAR_STYLE:
      GTK_VALUE_ENUM (*arg) = pbar->bar_style;
      break;
    case ARG_ACTIVITY_STEP:
      GTK_VALUE_UINT (*arg) = pbar->activity_step;
      break;
    case ARG_ACTIVITY_BLOCKS:
      GTK_VALUE_UINT (*arg) = pbar->activity_blocks;
      break;
    case ARG_DISCRETE_BLOCKS:
      GTK_VALUE_UINT (*arg) = pbar->blocks;
      break;
    default:
      arg->type = GTK_TYPE_INVALID;
      break;
    }
}

GtkWidget*
gtk_progress_bar_new (void)
{
  GtkWidget *pbar;

  pbar = gtk_widget_new (GTK_TYPE_PROGRESS_BAR, NULL);

  return pbar;
}

GtkWidget*
gtk_progress_bar_new_with_adjustment (GtkAdjustment *adjustment)
{
  GtkWidget *pbar;

  g_return_val_if_fail (adjustment != NULL, NULL);
  g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), NULL);

  pbar = gtk_widget_new (GTK_TYPE_PROGRESS_BAR,
			 "adjustment", adjustment,
			 NULL);

  return pbar;
}

static void
gtk_progress_bar_real_update (GtkProgress *progress)
{
  GtkProgressBar *pbar;
  GtkWidget *widget;

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

  pbar = GTK_PROGRESS_BAR (progress);
  widget = GTK_WIDGET (progress);
 
  if (pbar->bar_style == GTK_PROGRESS_CONTINUOUS ||
      GTK_PROGRESS (pbar)->activity_mode)
    {
      if (GTK_PROGRESS (pbar)->activity_mode)
	{
	  guint size;

	  /* advance the block */

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

	      if (pbar->activity_dir == 0)
		{
		  pbar->activity_pos += pbar->activity_step;
		  if (pbar->activity_pos + size >=
		      widget->allocation.height -
		      widget->style->klass->ythickness)
		    {
		      pbar->activity_pos = widget->allocation.height -
			widget->style->klass->ythickness - size;
		      pbar->activity_dir = 1;
		    }
		}
	      else
		{
		  pbar->activity_pos -= pbar->activity_step;
		  if (pbar->activity_pos <= widget->style->klass->ythickness)
		    {
		      pbar->activity_pos = widget->style->klass->ythickness;
		      pbar->activity_dir = 0;
		    }
		}
	    }
	}
      gtk_progress_bar_paint (progress);
      gtk_widget_queue_draw (GTK_WIDGET (progress));
    }
  else
    {
      gint in_block;
      
      in_block = -1 + (gint)(gtk_progress_get_current_percentage (progress) *
			     (gfloat)pbar->blocks);
      
      if (pbar->in_block != in_block)
	{
	  pbar->in_block = in_block;
	  gtk_progress_bar_paint (progress);
	  gtk_widget_queue_draw (GTK_WIDGET (progress));
	}
    }
}

static void
gtk_progress_bar_size_request (GtkWidget      *widget,
			       GtkRequisition *requisition)
{
  GtkProgress *progress;
  GtkProgressBar *pbar;
  gchar *buf;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_PROGRESS_BAR (widget));
  g_return_if_fail (requisition != NULL);

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

  if (pbar->orientation == GTK_PROGRESS_LEFT_TO_RIGHT ||
      pbar->orientation == GTK_PROGRESS_RIGHT_TO_LEFT)
    {
      if (progress->show_text && pbar->bar_style != GTK_PROGRESS_DISCRETE)
	{
	  buf = gtk_progress_get_text_from_value (progress,
						  progress->adjustment->upper);

	  requisition->width = MAX (MIN_HORIZONTAL_BAR_WIDTH,
				    2 * widget->style->klass->xthickness + 3 +
				    gdk_text_width (widget->style->font, 
						    buf, strlen (buf)) +
				    2 * TEXT_SPACING);

	  requisition->height = MAX (MIN_HORIZONTAL_BAR_HEIGHT,
				     2 * widget->style->klass->ythickness + 3 +
				     gdk_text_height (widget->style->font, 
						      buf, strlen (buf)) +
				     2 * TEXT_SPACING);
	  g_free (buf);
	}
      else
	{
	  requisition->width = MIN_HORIZONTAL_BAR_WIDTH;
	  requisition->height = MIN_HORIZONTAL_BAR_HEIGHT;
	}
    }
  else
    {
      if (progress->show_text && pbar->bar_style != GTK_PROGRESS_DISCRETE)
	{	  
	  buf = gtk_progress_get_text_from_value (progress,
						  progress->adjustment->upper);

	  requisition->width = MAX (MIN_VERTICAL_BAR_WIDTH,
				    2 * widget->style->klass->xthickness + 3 +
				    gdk_text_width (widget->style->font, 
						    buf, strlen (buf)) +
				    2 * TEXT_SPACING);

	  requisition->height = MAX (MIN_VERTICAL_BAR_HEIGHT,
				     2 * widget->style->klass->ythickness + 3 +
				     gdk_text_height (widget->style->font, 
						      buf, strlen (buf)) +
				     2 * TEXT_SPACING);
	  g_free (buf);
	}
      else
	{
	  requisition->width = MIN_VERTICAL_BAR_WIDTH;
	  requisition->height = MIN_VERTICAL_BAR_HEIGHT;
	}
    }
}

static void
gtk_progress_bar_act_mode_enter (GtkProgress *progress)