gtkspinbutton.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
 *
 * GtkSpinButton widget for GTK+
 * Copyright (C) 1998 Lars Hamann and Stefan Jeske
 *
 * 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 <stdlib.h>
#include <math.h>
#include <string.h>
#include <locale.h>
#include "gdk/gdkkeysyms.h"
#include "gtkspinbutton.h"
#include "gtkmain.h"
#include "gtksignal.h"


#define MIN_SPIN_BUTTON_WIDTH              30
#define ARROW_SIZE                         11
#define SPIN_BUTTON_INITIAL_TIMER_DELAY    200
#define SPIN_BUTTON_TIMER_DELAY            20
#define MAX_TEXT_LENGTH                    256
#define MAX_TIMER_CALLS                    5
#define EPSILON                            1e-5

enum {
  ARG_0,
  ARG_ADJUSTMENT,
  ARG_CLIMB_RATE,
  ARG_DIGITS,
  ARG_SNAP_TO_TICKS,
  ARG_NUMERIC,
  ARG_WRAP,
  ARG_UPDATE_POLICY,
  ARG_SHADOW_TYPE,
  ARG_VALUE
};


static void gtk_spin_button_class_init     (GtkSpinButtonClass *klass);
static void gtk_spin_button_init           (GtkSpinButton      *spin_button);
static void gtk_spin_button_finalize       (GtkObject          *object);
static void gtk_spin_button_set_arg        (GtkObject          *object,
					    GtkArg             *arg,
					    guint               arg_id);
static void gtk_spin_button_get_arg        (GtkObject          *object,
					    GtkArg             *arg,
					    guint               arg_id);
static void gtk_spin_button_map            (GtkWidget          *widget);
static void gtk_spin_button_unmap          (GtkWidget          *widget);
static void gtk_spin_button_realize        (GtkWidget          *widget);
static void gtk_spin_button_unrealize      (GtkWidget          *widget);
static void gtk_spin_button_size_request   (GtkWidget          *widget,
					    GtkRequisition     *requisition);
static void gtk_spin_button_size_allocate  (GtkWidget          *widget,
					    GtkAllocation      *allocation);
static void gtk_spin_button_paint          (GtkWidget          *widget,
					    GdkRectangle       *area);
static void gtk_spin_button_draw           (GtkWidget          *widget,
					    GdkRectangle       *area);
static gint gtk_spin_button_expose         (GtkWidget          *widget,
					    GdkEventExpose     *event);
static gint gtk_spin_button_button_press   (GtkWidget          *widget,
					    GdkEventButton     *event);
static gint gtk_spin_button_button_release (GtkWidget          *widget,
					    GdkEventButton     *event);
static gint gtk_spin_button_motion_notify  (GtkWidget          *widget,
					    GdkEventMotion     *event);
static gint gtk_spin_button_enter_notify   (GtkWidget          *widget,
					    GdkEventCrossing   *event);
static gint gtk_spin_button_leave_notify   (GtkWidget          *widget,
					    GdkEventCrossing   *event);
static gint gtk_spin_button_focus_out      (GtkWidget          *widget,
					    GdkEventFocus      *event);
static void gtk_spin_button_draw_arrow     (GtkSpinButton      *spin_button, 
					    guint               arrow);
static gint gtk_spin_button_timer          (GtkSpinButton      *spin_button);
static void gtk_spin_button_value_changed  (GtkAdjustment      *adjustment,
					    GtkSpinButton      *spin_button); 
static gint gtk_spin_button_key_press      (GtkWidget          *widget,
					    GdkEventKey        *event);
static gint gtk_spin_button_key_release    (GtkWidget          *widget,
					    GdkEventKey        *event);
static void gtk_spin_button_activate       (GtkEditable        *editable);
static void gtk_spin_button_snap           (GtkSpinButton      *spin_button,
					    gfloat              val);
static void gtk_spin_button_insert_text    (GtkEditable        *editable,
					    const gchar        *new_text,
					    gint                new_text_length,
					    gint               *position);
static void gtk_spin_button_real_spin      (GtkSpinButton      *spin_button,
					    gfloat              step);


static GtkEntryClass *parent_class = NULL;


GtkType
gtk_spin_button_get_type (void)
{
  static guint spin_button_type = 0;

  if (!spin_button_type)
    {
      static const GtkTypeInfo spin_button_info =
      {
	"GtkSpinButton",
	sizeof (GtkSpinButton),
	sizeof (GtkSpinButtonClass),
	(GtkClassInitFunc) gtk_spin_button_class_init,
	(GtkObjectInitFunc) gtk_spin_button_init,
	/* reserved_1 */ NULL,
        /* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL,
      };

      spin_button_type = gtk_type_unique (GTK_TYPE_ENTRY, &spin_button_info);
    }
  return spin_button_type;
}

static void
gtk_spin_button_class_init (GtkSpinButtonClass *class)
{
  GtkObjectClass   *object_class;
  GtkWidgetClass   *widget_class;
  GtkEditableClass *editable_class;

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

  parent_class = gtk_type_class (GTK_TYPE_ENTRY);

  gtk_object_add_arg_type ("GtkSpinButton::adjustment",
			   GTK_TYPE_ADJUSTMENT,
			   GTK_ARG_READWRITE,
			   ARG_ADJUSTMENT);
  gtk_object_add_arg_type ("GtkSpinButton::climb_rate",
			   GTK_TYPE_FLOAT,
			   GTK_ARG_READWRITE,
			   ARG_CLIMB_RATE);
  gtk_object_add_arg_type ("GtkSpinButton::digits",
			   GTK_TYPE_UINT,
			   GTK_ARG_READWRITE,
			   ARG_DIGITS);
  gtk_object_add_arg_type ("GtkSpinButton::snap_to_ticks",
			   GTK_TYPE_BOOL,
			   GTK_ARG_READWRITE,
			   ARG_SNAP_TO_TICKS);
  gtk_object_add_arg_type ("GtkSpinButton::numeric",
			   GTK_TYPE_BOOL,
			   GTK_ARG_READWRITE,
			   ARG_NUMERIC);
  gtk_object_add_arg_type ("GtkSpinButton::wrap",
			   GTK_TYPE_BOOL,
			   GTK_ARG_READWRITE,
			   ARG_WRAP);
  gtk_object_add_arg_type ("GtkSpinButton::update_policy",
			   GTK_TYPE_SPIN_BUTTON_UPDATE_POLICY,
			   GTK_ARG_READWRITE,
			   ARG_UPDATE_POLICY);
  gtk_object_add_arg_type ("GtkSpinButton::shadow_type",
			   GTK_TYPE_SHADOW_TYPE,
			   GTK_ARG_READWRITE,
			   ARG_SHADOW_TYPE);
  gtk_object_add_arg_type ("GtkSpinButton::value",
			   GTK_TYPE_FLOAT,
			   GTK_ARG_READWRITE,
			   ARG_VALUE);
  

  object_class->set_arg = gtk_spin_button_set_arg;
  object_class->get_arg = gtk_spin_button_get_arg;
  object_class->finalize = gtk_spin_button_finalize;

  widget_class->map = gtk_spin_button_map;
  widget_class->unmap = gtk_spin_button_unmap;
  widget_class->realize = gtk_spin_button_realize;
  widget_class->unrealize = gtk_spin_button_unrealize;
  widget_class->size_request = gtk_spin_button_size_request;
  widget_class->size_allocate = gtk_spin_button_size_allocate;
  widget_class->draw = gtk_spin_button_draw;
  widget_class->expose_event = gtk_spin_button_expose;
  widget_class->button_press_event = gtk_spin_button_button_press;
  widget_class->button_release_event = gtk_spin_button_button_release;
  widget_class->motion_notify_event = gtk_spin_button_motion_notify;
  widget_class->key_press_event = gtk_spin_button_key_press;
  widget_class->key_release_event = gtk_spin_button_key_release;
  widget_class->enter_notify_event = gtk_spin_button_enter_notify;
  widget_class->leave_notify_event = gtk_spin_button_leave_notify;
  widget_class->focus_out_event = gtk_spin_button_focus_out;

  editable_class->insert_text = gtk_spin_button_insert_text;
  editable_class->activate = gtk_spin_button_activate;
}

static void
gtk_spin_button_set_arg (GtkObject        *object,
			 GtkArg           *arg,
			 guint             arg_id)
{
  GtkSpinButton *spin_button;

  spin_button = GTK_SPIN_BUTTON (object);
  
  switch (arg_id)
    {
      GtkAdjustment *adjustment;

    case ARG_ADJUSTMENT:
      adjustment = GTK_VALUE_POINTER (*arg);
      if (!adjustment)
	adjustment = (GtkAdjustment*) gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
      gtk_spin_button_set_adjustment (spin_button, adjustment);
      break;
    case ARG_CLIMB_RATE:
      gtk_spin_button_configure (spin_button,
				 spin_button->adjustment,
				 GTK_VALUE_FLOAT (*arg),
				 spin_button->digits);
      break;
    case ARG_DIGITS:
      gtk_spin_button_configure (spin_button,
				 spin_button->adjustment,
				 spin_button->climb_rate,
				 GTK_VALUE_UINT (*arg));
      break;
    case ARG_SNAP_TO_TICKS:
      gtk_spin_button_set_snap_to_ticks (spin_button, GTK_VALUE_BOOL (*arg));
      break;
    case ARG_NUMERIC:
      gtk_spin_button_set_numeric (spin_button, GTK_VALUE_BOOL (*arg));
      break;
    case ARG_WRAP:
      gtk_spin_button_set_wrap (spin_button, GTK_VALUE_BOOL (*arg));
      break;
    case ARG_UPDATE_POLICY:
      gtk_spin_button_set_update_policy (spin_button, GTK_VALUE_ENUM (*arg));
      break;
    case ARG_SHADOW_TYPE:
      gtk_spin_button_set_shadow_type (spin_button, GTK_VALUE_ENUM (*arg));
      break;
    case ARG_VALUE:
      gtk_spin_button_set_value (spin_button, GTK_VALUE_FLOAT (*arg));
      break;
    default:
      break;
    }
}

static void
gtk_spin_button_get_arg (GtkObject        *object,
			 GtkArg           *arg,
			 guint             arg_id)
{
  GtkSpinButton *spin_button;

  spin_button = GTK_SPIN_BUTTON (object);
  
  switch (arg_id)
    {
    case ARG_ADJUSTMENT:
      GTK_VALUE_POINTER (*arg) = spin_button->adjustment;
      break;
    case ARG_CLIMB_RATE:
      GTK_VALUE_FLOAT (*arg) = spin_button->climb_rate;
      break;
    case ARG_DIGITS:
      GTK_VALUE_UINT (*arg) = spin_button->digits;
      break;
    case ARG_SNAP_TO_TICKS:
      GTK_VALUE_BOOL (*arg) = spin_button->snap_to_ticks;
      break;
    case ARG_NUMERIC:
      GTK_VALUE_BOOL (*arg) = spin_button->numeric;
      break;
    case ARG_WRAP:
      GTK_VALUE_BOOL (*arg) = spin_button->wrap;
      break;
    case ARG_UPDATE_POLICY:
      GTK_VALUE_ENUM (*arg) = spin_button->update_policy;
      break;
    case ARG_SHADOW_TYPE:
      GTK_VALUE_ENUM (*arg) = spin_button->shadow_type;
      break;
    case ARG_VALUE:
      GTK_VALUE_FLOAT (*arg) = spin_button->adjustment->value;
      break;
    default:
      arg->type = GTK_TYPE_INVALID;
      break;
    }
}

static void
gtk_spin_button_init (GtkSpinButton *spin_button)
{
  spin_button->adjustment = NULL;
  spin_button->panel = NULL;
  spin_button->shadow_type = GTK_SHADOW_NONE;
  spin_button->timer = 0;
  spin_button->ev_time = 0;
  spin_button->climb_rate = 0.0;
  spin_button->timer_step = 0.0;
  spin_button->update_policy = GTK_UPDATE_ALWAYS;
  spin_button->in_child = 2;
  spin_button->click_child = 2;
  spin_button->button = 0;
  spin_button->need_timer = FALSE;
  spin_button->timer_calls = 0;
  spin_button->digits = 0;
  spin_button->numeric = FALSE;
  spin_button->wrap = FALSE;
  spin_button->snap_to_ticks = FALSE;

  gtk_spin_button_set_adjustment (spin_button,
				  (GtkAdjustment*) gtk_adjustment_new (0, 0, 0, 0, 0, 0));
}

static void
gtk_spin_button_finalize (GtkObject *object)
{
  g_return_if_fail (object != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (object));

  gtk_object_unref (GTK_OBJECT (GTK_SPIN_BUTTON (object)->adjustment));
  
  GTK_OBJECT_CLASS (parent_class)->finalize (object);
}

static void
gtk_spin_button_map (GtkWidget *widget)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (widget));

  if (GTK_WIDGET_REALIZED (widget) && !GTK_WIDGET_MAPPED (widget))
    {
      GTK_WIDGET_CLASS (parent_class)->map (widget);
      gdk_window_show (GTK_SPIN_BUTTON (widget)->panel);
    }
}

static void
gtk_spin_button_unmap (GtkWidget *widget)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (widget));

  if (GTK_WIDGET_MAPPED (widget))
    {
      gdk_window_hide (GTK_SPIN_BUTTON (widget)->panel);
      GTK_WIDGET_CLASS (parent_class)->unmap (widget);
    }
}

static void
gtk_spin_button_realize (GtkWidget *widget)
{
  GtkSpinButton *spin;
  GdkWindowAttr attributes;
  gint attributes_mask;
  guint real_width;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (widget));
  
  spin = GTK_SPIN_BUTTON (widget);

  real_width = widget->allocation.width;
  widget->allocation.width -= ARROW_SIZE + 2 * widget->style->klass->xthickness;
  gtk_widget_set_events (widget, gtk_widget_get_events (widget) |
			 GDK_KEY_RELEASE_MASK);
  GTK_WIDGET_CLASS (parent_class)->realize (widget);

  widget->allocation.width = real_width;
  
  attributes.window_type = GDK_WINDOW_CHILD;
  attributes.wclass = GDK_INPUT_OUTPUT;
  attributes.visual = gtk_widget_get_visual (widget);
  attributes.colormap = gtk_widget_get_colormap (widget);
  attributes.event_mask = gtk_widget_get_events (widget);
  attributes.event_mask |= GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK 
    | GDK_BUTTON_RELEASE_MASK | GDK_LEAVE_NOTIFY_MASK | GDK_ENTER_NOTIFY_MASK 
    | GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK;

  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;

  attributes.x = (widget->allocation.x + widget->allocation.width - ARROW_SIZE -
		  2 * widget->style->klass->xthickness);
  attributes.y = widget->allocation.y + (widget->allocation.height -
					 widget->requisition.height) / 2;
  attributes.width = ARROW_SIZE + 2 * widget->style->klass->xthickness;
  attributes.height = widget->requisition.height;
  
  spin->panel = gdk_window_new (gtk_widget_get_parent_window (widget), 
				&attributes, attributes_mask);
  gdk_window_set_user_data (spin->panel, widget);

  gtk_style_set_background (widget->style, spin->panel, GTK_STATE_NORMAL);
}

static void
gtk_spin_button_unrealize (GtkWidget *widget)
{
  GtkSpinButton *spin;

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

  spin = GTK_SPIN_BUTTON (widget);

  GTK_WIDGET_CLASS (parent_class)->unrealize (widget);

  if (spin->panel)
    {
      gdk_window_set_user_data (spin->panel, NULL);
      gdk_window_destroy (spin->panel);
      spin->panel = NULL;
    }
}

static void
gtk_spin_button_size_request (GtkWidget      *widget,
			      GtkRequisition *requisition)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (requisition != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (widget));

  GTK_WIDGET_CLASS (parent_class)->size_request (widget, requisition);
  
  requisition->width = MIN_SPIN_BUTTON_WIDTH + ARROW_SIZE 
    + 2 * widget->style->klass->xthickness;
}

static void
gtk_spin_button_size_allocate (GtkWidget     *widget,
			       GtkAllocation *allocation)
{
  GtkAllocation child_allocation;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (widget));
  g_return_if_fail (allocation != NULL);

  child_allocation = *allocation;
  child_allocation.width -= ARROW_SIZE + 2 * widget->style->klass->xthickness;

  GTK_WIDGET_CLASS (parent_class)->size_allocate (widget, &child_allocation);

  widget->allocation = *allocation;

  if (GTK_WIDGET_REALIZED (widget))
    {
      child_allocation.width = ARROW_SIZE + 2 * widget->style->klass->xthickness;
      child_allocation.height = widget->requisition.height;  
      child_allocation.x = (allocation->x + allocation->width - ARROW_SIZE - 
			    2 * widget->style->klass->xthickness);
      child_allocation.y = allocation->y + (allocation->height - widget->requisition.height) / 2;

      gdk_window_move_resize (GTK_SPIN_BUTTON (widget)->panel, 
			      child_allocation.x,
			      child_allocation.y,
			      child_allocation.width,
			      child_allocation.height); 
    }
}

static void
gtk_spin_button_paint (GtkWidget    *widget,
		       GdkRectangle *area)
{
  GtkSpinButton *spin;

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

  spin = GTK_SPIN_BUTTON (widget);

  if (GTK_WIDGET_DRAWABLE (widget))
    {
      if (spin->shadow_type != GTK_SHADOW_NONE)
	gtk_paint_box (widget->style, spin->panel,
		       GTK_STATE_NORMAL, spin->shadow_type,
		       area, widget, "spinbutton",
		       0, 0, 
		       ARROW_SIZE + 2 * widget->style->klass->xthickness,
		       widget->requisition.height); 
      else
	 {
	    gdk_window_set_back_pixmap (spin->panel, NULL, TRUE);
	    gdk_window_clear_area (spin->panel, area->x, area->y, area->width, area->height);
	 }
       gtk_spin_button_draw_arrow (spin, GTK_ARROW_UP);
       gtk_spin_button_draw_arrow (spin, GTK_ARROW_DOWN);

       GTK_WIDGET_CLASS (parent_class)->draw (widget, area);
    }
}

static void
gtk_spin_button_draw (GtkWidget    *widget,
		      GdkRectangle *area)
{
  g_return_if_fail (widget != NULL);