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float.cpp

/*
 * 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/extension.h"
#include "preferences.h"
#include "float.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, bool gui_hidden, const gchar * gui_tip, Inkscape::Extension::Extension * ext, Inkscape::XML::Node * xml) :
        Parameter(name, guitext, desc, scope, gui_hidden, gui_tip, ext), _value(0.0), _min(0.0), _max(10.0)
{
    const gchar * defaultval = NULL;
    if (sp_repr_children(xml) != NULL)
        defaultval = sp_repr_children(xml)->content();
    if (defaultval != NULL) {
        _value = g_ascii_strtod (defaultval,NULL);
    }

    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();
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    _value = prefs->getDouble(extension_pref_root + 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();
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    prefs->setDouble(extension_pref_root + prefname, _value);
    g_free(prefname);

    return _value;
}

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

/** \brief  A class to make an adjustment that uses Extension params */
00103 class ParamFloatAdjustment : public Gtk::Adjustment {
    /** The parameter to adjust */
00105     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. */
00112     ParamFloatAdjustment (ParamFloat * param, SPDocument * doc, Inkscape::XML::Node * node, sigc::signal<void> * changeSignal) :
            Gtk::Adjustment(0.0, param->min(), param->max(), 0.1, 0), _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
00129 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)
{
      if (_gui_hidden) return NULL;

    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 */

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