hedera/vn/field/vn-spin.c

/*
 * Copyright (C) 2012 - Juan Ferrer Toribio
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include "vn-spin.h"
#include <db/db.h>

/**
 * SECTION:vn-spin
 * @Short_description: an incrementable numeric field
 * @Title: VnSpin
 * @See_also: #VnField
 * @Image: spin.png
 *
 * An incrementable numeric field
 */
G_DEFINE_TYPE (VnSpin, vn_spin, VN_TYPE_FIELD);

/**
 * vn_spin_new:
 *
 * Creates a new #VnSpin
 *
 * Return value: a #VnSpin
 **/
VnField * vn_spin_new ()
{
	return g_object_new (VN_TYPE_SPIN, NULL);
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Private

static void vn_spin_on_value_changed (GtkSpinButton * spin, VnField * obj)
{
	GValue value = G_VALUE_INIT;

	if (g_strcmp0 (gtk_entry_get_text (GTK_ENTRY (spin)), ""))
	{
		g_value_init (&value, G_TYPE_DOUBLE);
		g_value_set_double (&value, gtk_spin_button_get_value (spin));
	}
	else
		g_value_init (&value, GVN_TYPE_NULL);

	VN_FIELD_GET_CLASS (obj)->value_changed (obj, &value);
	g_value_unset (&value);
}

static gboolean vn_spin_cb_focus_out (GtkSpinButton * spin, GdkEvent * event, VnField * obj)
{
	vn_spin_on_value_changed (spin, obj);
	return FALSE;
}

static gboolean vn_spin_on_output (GtkSpinButton * spin, VnField * obj)
{
	const gchar * text = gtk_entry_get_text (GTK_ENTRY (spin));

	return vn_field_get_null (obj)
		&& (!text || !g_strcmp0 (text, ""))
		&& gtk_spin_button_get_value (spin) == 0.0;
} 

static void vn_spin_set_value (VnSpin * obj, const GValue * value)
{
	g_signal_handlers_block_by_func (obj->spin,
		vn_spin_on_value_changed, obj);

	if (!gvn_value_is_null (value))
	{
		GValue new_value = G_VALUE_INIT;
		g_value_init (&new_value, G_TYPE_DOUBLE);
		g_value_transform (value, &new_value);
		gtk_spin_button_set_value (obj->spin,
			g_value_get_double (&new_value));
		g_value_unset (&new_value);
	}
	else
		gtk_entry_set_text (GTK_ENTRY (obj->spin), "");

	g_signal_handlers_unblock_by_func (obj->spin,
		vn_spin_on_value_changed, obj);
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Properties

enum
{
	 PROP_DIGITS = 1
};

static void vn_spin_set_property (VnSpin * obj, guint id,
	const GValue * value, GParamSpec * pspec)
{
	switch (id)
	{
		case PROP_DIGITS:
			gtk_spin_button_set_digits (obj->spin, g_value_get_uint (value));
			break;
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, id, pspec);
	}
}

static void vn_spin_get_property (VnSpin * obj, guint id,
	GValue * value, GParamSpec * pspec)
{	
	switch (id)
	{
		case PROP_DIGITS:
			g_value_set_uint (value, gtk_spin_button_get_digits (obj->spin));
			break;
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, id, pspec);
	}
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Class

static void vn_spin_init (VnSpin * obj)
{
	obj->spin = GTK_SPIN_BUTTON (gtk_spin_button_new (NULL, 1, 0));
	gtk_spin_button_set_range (obj->spin, G_MININT, G_MAXINT);
	gtk_spin_button_set_update_policy (obj->spin, GTK_UPDATE_ALWAYS);
	gtk_spin_button_set_numeric (obj->spin, TRUE);
	gtk_spin_button_set_increments (obj->spin, 1, 1);
	gtk_container_add (GTK_CONTAINER (obj), GTK_WIDGET (obj->spin));

	g_object_connect (obj->spin
//		,"signal::activate", vn_spin_on_value_changed, obj
		,"signal::value-changed", vn_spin_on_value_changed, obj
		,"signal::focus-out-event", vn_spin_cb_focus_out, obj
		,"signal::output", vn_spin_on_output, obj
		,NULL
	);
	g_signal_connect (obj->spin, "value-changed",
		G_CALLBACK (vn_spin_on_value_changed), obj);
	g_signal_connect (obj->spin, "output",
		G_CALLBACK (vn_spin_on_output), obj);

	VN_FIELD (obj)->field = GTK_WIDGET (obj->spin);
}

static void vn_spin_finalize (VnSpin * obj)
{
	G_OBJECT_CLASS (vn_spin_parent_class)->finalize (G_OBJECT (obj));
}

static void vn_spin_class_init (VnSpinClass * klass)
{
	GObjectClass * k = G_OBJECT_CLASS (klass);
	k->set_property = (GObjectSetPropertyFunc) vn_spin_set_property;
	k->get_property = (GObjectGetPropertyFunc) vn_spin_get_property;
	G_OBJECT_CLASS (klass)->finalize = (GObjectFinalizeFunc) vn_spin_finalize;
	VN_FIELD_CLASS (klass)->set_value = (VnFieldSetValueFunc) vn_spin_set_value;
	
	g_object_class_install_property (k, PROP_DIGITS,
		g_param_spec_uint ("digits"
			,_("Digits")
			,_("The number of decimal places to display.")
			,0 ,20 ,0
			,G_PARAM_CONSTRUCT | G_PARAM_READWRITE
	));
}