src/extension/paramfloat.cpp

	paramfloat.cpp revision 282963165a505f1e709cf741fb2825b6a78cdd6c
/*
 * Copyright (C) 2005-2007 Authors:
 *   Ted Gould <ted@gould.cx>
 *   Johan Engelen <johan@shouraizou.nl> *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <gtkmm/adjustment.h>
#include <gtkmm/box.h>
#include <gtkmm/spinbutton.h>

#include <xml/node.h>

#include "extension.h"
#include "paramfloat.h"

namespace Inkscape {
namespace Extension {


/** \brief  Use the superclass' allocator and set the \c _value */
ParamFloat::ParamFloat (const gchar * name, const gchar * guitext, const gchar * desc, const Parameter::_scope_t scope, Inkscape::Extension::Extension * ext, Inkscape::XML::Node * xml) :
        Parameter(name, guitext, desc, scope, ext), _value(0.0), _min(0.0), _max(10.0)
{
    const char * defaultval = NULL;
    if (sp_repr_children(xml) != NULL)
        defaultval = sp_repr_children(xml)->content();
    if (defaultval != NULL) {
        _value = atof(defaultval);
    }

    const char * maxval = xml->attribute("max");
    if (maxval != NULL)
        _max = atof(maxval);

    const char * minval = xml->attribute("min");
    if (minval != NULL)
        _min = atof(minval);

    _precision = 1;
    const char * precision = xml->attribute("precision");
    if (precision != NULL)
        _precision = atoi(precision);

    /* We're handling this by just killing both values */
    if (_max < _min) {
        _max = 10.0;
        _min = 0.0;
    }

    gchar * pref_name = this->pref_name();
    _value = prefs_get_double_attribute(PREF_DIR, pref_name, _value);
    g_free(pref_name);

    // std::cout << "New Float::  value: " << _value << "  max: " << _max << "  min: " << _min << std::endl;

    if (_value > _max) _value = _max;
    if (_value < _min) _value = _min;

    return;
}

/** \brief  A function to set the \c _value
    \param  in   The value to set to
    \param  doc  A document that should be used to set the value.
    \param  node The node where the value may be placed

    This function sets the internal value, but it also sets the value
    in the preferences structure.  To put it in the right place, \c PREF_DIR
    and \c pref_name() are used.
*/
float
ParamFloat::set (float in, SPDocument * /*doc*/, Inkscape::XML::Node * /*node*/)
{
    _value = in;
    if (_value > _max) _value = _max;
    if (_value < _min) _value = _min;

    gchar * prefname = this->pref_name();
    prefs_set_double_attribute(PREF_DIR, prefname, _value);
    g_free(prefname);

    return _value;
}

/** \brief  Return the value as a string */
Glib::ustring *
ParamFloat::string (void)
{
    char startstring[G_ASCII_DTOSTR_BUF_SIZE];
    g_ascii_dtostr(startstring, G_ASCII_DTOSTR_BUF_SIZE, _value);
    Glib::ustring * mystring = new Glib::ustring(startstring);
    return mystring;
}

/** \brief  A class to make an adjustment that uses Extension params */
class ParamFloatAdjustment : public Gtk::Adjustment {
    /** The parameter to adjust */
    ParamFloat * _pref;
    SPDocument * _doc;
    Inkscape::XML::Node * _node;
    sigc::signal<void> * _changeSignal;
public:
    /** \brief  Make the adjustment using an extension and the string
                describing the parameter. */
    ParamFloatAdjustment (ParamFloat * param, SPDocument * doc, Inkscape::XML::Node * node, sigc::signal<void> * changeSignal) :
            Gtk::Adjustment(0.0, param->min(), param->max(), 0.1), _pref(param), _doc(doc), _node(node), _changeSignal(changeSignal) {
        this->set_value(_pref->get(NULL, NULL) /* \todo fix */);
        this->signal_value_changed().connect(sigc::mem_fun(this, &ParamFloatAdjustment::val_changed));
        return;
    };

    void val_changed (void);
}; /* class ParamFloatAdjustment */

/** \brief  A function to respond to the value_changed signal from the
            adjustment.

    This function just grabs the value from the adjustment and writes
    it to the parameter.  Very simple, but yet beautiful.
*/
void
ParamFloatAdjustment::val_changed (void)
{
    //std::cout << "Value Changed to: " << this->get_value() << std::endl;
    _pref->set(this->get_value(), _doc, _node);
    if (_changeSignal != NULL) {
        _changeSignal->emit();
    }
    return;
}

/**
    \brief  Creates a Float Adjustment for a float parameter

    Builds a hbox with a label and a float adjustment in it.
*/
Gtk::Widget *
ParamFloat::get_widget (SPDocument * doc, Inkscape::XML::Node * node, sigc::signal<void> * changeSignal)
{
    Gtk::HBox * hbox = Gtk::manage(new Gtk::HBox(false, 4));

    Gtk::Label * label = Gtk::manage(new Gtk::Label(_(_text), Gtk::ALIGN_LEFT));
    label->show();
    hbox->pack_start(*label, true, true);

    ParamFloatAdjustment * fadjust = Gtk::manage(new ParamFloatAdjustment(this, doc, node, changeSignal));
    Gtk::SpinButton * spin = Gtk::manage(new Gtk::SpinButton(*fadjust, 0.1, _precision));
    spin->show();
    hbox->pack_start(*spin, false, false);

    hbox->show();

    return dynamic_cast<Gtk::Widget *>(hbox);
}


}  /* namespace Extension */
}  /* namespace Inkscape */