gtkrange.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/. 
 */

#include <stdio.h>
#include "gtkmain.h"
#include "gtkrange.h"
#include "gtksignal.h"


#define SCROLL_TIMER_LENGTH  20
#define SCROLL_INITIAL_DELAY 100
#define SCROLL_DELAY_LENGTH  300

#define RANGE_CLASS(w)  GTK_RANGE_CLASS (GTK_OBJECT (w)->klass)

enum {
  ARG_0,
  ARG_UPDATE_POLICY
};

static void gtk_range_class_init               (GtkRangeClass    *klass);
static void gtk_range_init                     (GtkRange         *range);
static void gtk_range_set_arg		       (GtkObject        *object,
						GtkArg           *arg,
						guint             arg_id);
static void gtk_range_get_arg		       (GtkObject        *object,
						GtkArg           *arg,
						guint             arg_id);
static void gtk_range_destroy                  (GtkObject        *object);
static void gtk_range_finalize                 (GtkObject        *object);
static void gtk_range_draw                     (GtkWidget        *widget,
						GdkRectangle     *area);
static void gtk_range_draw_focus               (GtkWidget        *widget);
static void gtk_range_unrealize                (GtkWidget        *widget);
static gint gtk_range_expose                   (GtkWidget        *widget,
						GdkEventExpose   *event);
static gint gtk_range_button_press             (GtkWidget        *widget,
						GdkEventButton   *event);
static gint gtk_range_button_release           (GtkWidget        *widget,
						GdkEventButton   *event);
static gint gtk_range_motion_notify            (GtkWidget        *widget,
						GdkEventMotion   *event);
static gint gtk_range_key_press                (GtkWidget         *widget,
						GdkEventKey       *event);
static gint gtk_range_enter_notify             (GtkWidget        *widget,
						GdkEventCrossing *event);
static gint gtk_range_leave_notify             (GtkWidget        *widget,
						GdkEventCrossing *event);
static gint gtk_range_focus_in                 (GtkWidget        *widget,
						GdkEventFocus    *event);
static gint gtk_range_focus_out                (GtkWidget        *widget,
						GdkEventFocus    *event);
static void gtk_range_style_set                 (GtkWidget       *widget,
						 GtkStyle        *previous_style);

static void gtk_real_range_draw_trough         (GtkRange         *range);
static void gtk_real_range_draw_slider         (GtkRange         *range);
static gint gtk_real_range_timer               (GtkRange         *range);
static gint gtk_range_scroll                   (GtkRange         *range,
						gfloat            jump_perc);

static void gtk_range_add_timer                (GtkRange         *range);
static void gtk_range_remove_timer             (GtkRange         *range);

static void gtk_range_adjustment_changed       (GtkAdjustment    *adjustment,
						gpointer          data);
static void gtk_range_adjustment_value_changed (GtkAdjustment    *adjustment,
						gpointer          data);

static void gtk_range_trough_hdims             (GtkRange         *range,
						gint             *left,
						gint             *right);
static void gtk_range_trough_vdims             (GtkRange         *range,
						gint             *top,
						gint             *bottom);

static GtkWidgetClass *parent_class = NULL;


GtkType
gtk_range_get_type (void)
{
  static GtkType range_type = 0;

  if (!range_type)
    {
      static const GtkTypeInfo range_info =
      {
	"GtkRange",
	sizeof (GtkRange),
	sizeof (GtkRangeClass),
	(GtkClassInitFunc) gtk_range_class_init,
	(GtkObjectInitFunc) gtk_range_init,
	/* reserved_1 */ NULL,
        /* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL,
      };

      range_type = gtk_type_unique (GTK_TYPE_WIDGET, &range_info);
    }

  return range_type;
}

static void
gtk_range_class_init (GtkRangeClass *class)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;

  object_class = (GtkObjectClass*) class;
  widget_class = (GtkWidgetClass*) class;

  parent_class = gtk_type_class (GTK_TYPE_WIDGET);

  gtk_object_add_arg_type ("GtkRange::update_policy",
			   GTK_TYPE_UPDATE_TYPE,
			   GTK_ARG_READWRITE,
			   ARG_UPDATE_POLICY);

  object_class->set_arg = gtk_range_set_arg;
  object_class->get_arg = gtk_range_get_arg;
  object_class->destroy = gtk_range_destroy;
  object_class->finalize = gtk_range_finalize;

  widget_class->draw = gtk_range_draw;
  widget_class->draw_focus = gtk_range_draw_focus;
  widget_class->unrealize = gtk_range_unrealize;
  widget_class->expose_event = gtk_range_expose;
  widget_class->button_press_event = gtk_range_button_press;
  widget_class->button_release_event = gtk_range_button_release;
  widget_class->motion_notify_event = gtk_range_motion_notify;
  widget_class->key_press_event = gtk_range_key_press;
  widget_class->enter_notify_event = gtk_range_enter_notify;
  widget_class->leave_notify_event = gtk_range_leave_notify;
  widget_class->focus_in_event = gtk_range_focus_in;
  widget_class->focus_out_event = gtk_range_focus_out;
  widget_class->style_set = gtk_range_style_set;

  class->slider_width = 11;
  class->stepper_size = 11;
  class->stepper_slider_spacing = 1;
  class->min_slider_size = 7;
  class->trough = 1;
  class->slider = 2;
  class->step_forw = 3;
  class->step_back = 4;
  class->draw_background = NULL;
  class->clear_background = NULL;
  class->draw_trough = gtk_real_range_draw_trough;
  class->draw_slider = gtk_real_range_draw_slider;
  class->draw_step_forw = NULL;
  class->draw_step_back = NULL;
  class->trough_click = NULL;
  class->trough_keys = NULL;
  class->motion = NULL;
  class->timer = gtk_real_range_timer;
}

static void
gtk_range_set_arg (GtkObject      *object,
		   GtkArg         *arg,
		   guint           arg_id)
{
  GtkRange *range;

  range = GTK_RANGE (object);

  switch (arg_id)
    {
    case ARG_UPDATE_POLICY:
      gtk_range_set_update_policy (range, GTK_VALUE_ENUM (*arg));
      break;
    default:
      break;
    }
}

static void
gtk_range_get_arg (GtkObject      *object,
		   GtkArg         *arg,
		   guint           arg_id)
{
  GtkRange *range;

  range = GTK_RANGE (object);

  switch (arg_id)
    {
    case ARG_UPDATE_POLICY:
      GTK_VALUE_ENUM (*arg) = range->policy;
      break;
    default:
      arg->type = GTK_TYPE_INVALID;
      break;
    }
}

static void
gtk_range_init (GtkRange *range)
{
  range->trough = NULL;
  range->slider = NULL;
  range->step_forw = NULL;
  range->step_back = NULL;

  range->x_click_point = 0;
  range->y_click_point = 0;
  range->button = 0;
  range->digits = -1;
  range->policy = GTK_UPDATE_CONTINUOUS;
  range->scroll_type = GTK_SCROLL_NONE;
  range->in_child = 0;
  range->click_child = 0;
  range->need_timer = FALSE;
  range->timer = 0;
  range->old_value = 0.0;
  range->old_lower = 0.0;
  range->old_upper = 0.0;
  range->old_page_size = 0.0;
  range->adjustment = NULL;
}

GtkAdjustment*
gtk_range_get_adjustment (GtkRange *range)
{
  g_return_val_if_fail (range != NULL, NULL);
  g_return_val_if_fail (GTK_IS_RANGE (range), NULL);

  return range->adjustment;
}

void
gtk_range_set_update_policy (GtkRange      *range,
			     GtkUpdateType  policy)
{
  g_return_if_fail (range != NULL);
  g_return_if_fail (GTK_IS_RANGE (range));

  range->policy = policy;
}

void
gtk_range_set_adjustment (GtkRange      *range,
			  GtkAdjustment *adjustment)
{
  g_return_if_fail (range != NULL);
  g_return_if_fail (GTK_IS_RANGE (range));
  
  if (!adjustment)
    adjustment = (GtkAdjustment*) gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
  else
    g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));

  if (range->adjustment != adjustment)
    {
      if (range->adjustment)
	{
	  gtk_signal_disconnect_by_data (GTK_OBJECT (range->adjustment),
					 (gpointer) range);
	  gtk_object_unref (GTK_OBJECT (range->adjustment));
	}

      range->adjustment = adjustment;
      gtk_object_ref (GTK_OBJECT (adjustment));
      gtk_object_sink (GTK_OBJECT (adjustment));
      
      gtk_signal_connect (GTK_OBJECT (adjustment), "changed",
			  (GtkSignalFunc) gtk_range_adjustment_changed,
			  (gpointer) range);
      gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
			  (GtkSignalFunc) gtk_range_adjustment_value_changed,
			  (gpointer) range);
      
      range->old_value = adjustment->value;
      range->old_lower = adjustment->lower;
      range->old_upper = adjustment->upper;
      range->old_page_size = adjustment->page_size;
      
      gtk_range_adjustment_changed (adjustment, (gpointer) range);
    }
}

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

  if (range->trough && RANGE_CLASS (range)->draw_background)
    (* RANGE_CLASS (range)->draw_background) (range);
}

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

  if (range->trough && RANGE_CLASS (range)->clear_background)
    (* RANGE_CLASS (range)->clear_background) (range);
}

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

  if (range->trough && RANGE_CLASS (range)->draw_trough)
    (* RANGE_CLASS (range)->draw_trough) (range);
}

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

  if (range->slider && RANGE_CLASS (range)->draw_slider)
    (* RANGE_CLASS (range)->draw_slider) (range);
}

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

  if (range->step_forw && RANGE_CLASS (range)->draw_step_forw)
    (* RANGE_CLASS (range)->draw_step_forw) (range);
}

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

  if (range->step_back && RANGE_CLASS (range)->draw_step_back)
    (* RANGE_CLASS (range)->draw_step_back) (range);
}

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

  if (RANGE_CLASS (range)->slider_update)
    (* RANGE_CLASS (range)->slider_update) (range);
}

gint
gtk_range_trough_click (GtkRange *range,
			gint      x,
			gint      y,
			gfloat   *jump_perc)
{
  g_return_val_if_fail (range != NULL, GTK_TROUGH_NONE);
  g_return_val_if_fail (GTK_IS_RANGE (range), GTK_TROUGH_NONE);

  if (RANGE_CLASS (range)->trough_click)
    return (* RANGE_CLASS (range)->trough_click) (range, x, y, jump_perc);

  return GTK_TROUGH_NONE;
}

void
gtk_range_default_hslider_update (GtkRange *range)
{
  gint left;
  gint right;
  gint x;

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

  if (GTK_WIDGET_REALIZED (range))
    {
      gtk_range_trough_hdims (range, &left, &right);
      x = left;

      if (range->adjustment->value < range->adjustment->lower)
	{
	  range->adjustment->value = range->adjustment->lower;
	  gtk_signal_emit_by_name (GTK_OBJECT (range->adjustment), "value_changed");
	}
      else if (range->adjustment->value > range->adjustment->upper)
	{
	  range->adjustment->value = range->adjustment->upper;
	  gtk_signal_emit_by_name (GTK_OBJECT (range->adjustment), "value_changed");
	}

      if (range->adjustment->lower != (range->adjustment->upper - range->adjustment->page_size))
	x += ((right - left) * (range->adjustment->value - range->adjustment->lower) /
	      (range->adjustment->upper - range->adjustment->lower - range->adjustment->page_size));

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

      gdk_window_move (range->slider, x, GTK_WIDGET (range)->style->klass->ythickness);
    }
}

void
gtk_range_default_vslider_update (GtkRange *range)
{
  gint top;
  gint bottom;
  gint y;

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

  if (GTK_WIDGET_REALIZED (range))
    {
      gtk_range_trough_vdims (range, &top, &bottom);
      y = top;

      if (range->adjustment->value < range->adjustment->lower)
	{
	  range->adjustment->value = range->adjustment->lower;
	  gtk_signal_emit_by_name (GTK_OBJECT (range->adjustment), "value_changed");
	}
      else if (range->adjustment->value > range->adjustment->upper)
	{
	  range->adjustment->value = range->adjustment->upper;
	  gtk_signal_emit_by_name (GTK_OBJECT (range->adjustment), "value_changed");
	}

      if (range->adjustment->lower != (range->adjustment->upper - range->adjustment->page_size))
	y += ((bottom - top) * (range->adjustment->value - range->adjustment->lower) /
	      (range->adjustment->upper - range->adjustment->lower - range->adjustment->page_size));

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

      gdk_window_move (range->slider, GTK_WIDGET (range)->style->klass->xthickness, y);
    }
}

gint
gtk_range_default_htrough_click (GtkRange *range,
				 gint      x,
				 gint      y,
				 gfloat	  *jump_perc)
{
  gint ythickness;
  gint trough_width;
  gint trough_height;
  gint slider_x;
  gint slider_length;
  gint left, right;

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

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

  gtk_range_trough_hdims (range, &left, &right);
  gdk_window_get_size (range->slider, &slider_length, NULL);
  right += slider_length;
	      
  if ((x > left) && (y > ythickness))
    {
      gdk_window_get_size (range->trough, &trough_width, &trough_height);

      if ((x < right) && (y < (trough_height - ythickness)))
	{
	  if (jump_perc)
	    {
	      *jump_perc = ((gdouble) (x - left)) / ((gdouble) (right - left));
	      return GTK_TROUGH_JUMP;
	    }
	  
	  gdk_window_get_position (range->slider, &slider_x, NULL);
	  
	  if (x < slider_x)
	    return GTK_TROUGH_START;
	  else
	    return GTK_TROUGH_END;
	}
    }

  return GTK_TROUGH_NONE;
}

gint
gtk_range_default_vtrough_click (GtkRange *range,
				 gint      x,
				 gint      y,
				 gfloat   *jump_perc)
{
  gint xthickness;
  gint trough_width;
  gint trough_height;
  gint slider_y;
  gint top, bottom;
  gint slider_length;

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