ui/widget/spinbutton.cpp

	spinbutton.cpp revision 8948c8b1e432a789e26a545f7f93128b34e7d310
/**
 * \brief SpinButton widget, that allows entry of both '.' and ',' for the decimal, even when in numeric mode.
 */
/*
 * Author:
 *   Johan B. C. Engelen
 *
 * Copyright (C) 2011 Author
 *
 * Released under GNU GPL.  Read the file 'COPYING' for more information.
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include "spinbutton.h"

#include "unit-menu.h"
#include "util/expression-evaluator.h"
#include "event-context.h"

namespace Inkscape {
namespace UI {
namespace Widget {


void
SpinButton::connect_signals() {
    signal_input().connect(sigc::mem_fun(*this, &SpinButton::on_input));
    signal_focus_in_event().connect(sigc::mem_fun(*this, &SpinButton::on_my_focus_in_event));
    signal_key_press_event().connect(sigc::mem_fun(*this, &SpinButton::on_my_key_press_event));
};

/**
 * This callback function should try to convert the entered text to a number and write it to newvalue.
 * It calls a method to evaluate the (potential) mathematical expression.
 *
 * @retval false No conversion done, continue with default handler.
 * @retval true  Conversion successful, don't call default handler.
 */
int
SpinButton::on_input(double* newvalue)
{
    try {
        Inkscape::Util::GimpEevlQuantity result;
        if (_unit_menu) {
            Unit unit = _unit_menu->getUnit();
            result = Inkscape::Util::gimp_eevl_evaluate (get_text().c_str(), &unit);
            // check if output dimension corresponds to input unit
            if (result.dimension != (unit.isAbsolute() ? 1 : 0) ) {
                throw Inkscape::Util::EvaluatorException("Input dimensions do not match with parameter dimensions.","");
            }
        } else {
            result = Inkscape::Util::gimp_eevl_evaluate (get_text().c_str(), NULL);
        }

        *newvalue = result.value;
    }
    catch(Inkscape::Util::EvaluatorException &e) {
        g_message ("%s", e.what());

        return false;
    }

    return true;
}

/** When focus is obtained, save the value to enable undo later.
 * @retval false continue with default handler.
 * @retval true  don't call default handler.
*/
bool
SpinButton::on_my_focus_in_event(GdkEventFocus* /*event*/)
{
    on_focus_in_value = get_value();
    return false; // do not consume the event
}

/** Handle specific keypress events, like Ctrl+Z
 * @retval false continue with default handler.
 * @retval true  don't call default handler.
*/
bool
SpinButton::on_my_key_press_event(GdkEventKey* event)
{
    switch (get_group0_keyval (event)) {
    case GDK_Escape:
        undo();
        return true; // I consumed the event
        break;
    case GDK_z:
    case GDK_Z:
        if (event->state & GDK_CONTROL_MASK) {
            undo();
            return true; // I consumed the event
        }
        break;
    default:
        break;
    }

    return false; // do not consume the event
}

/**
 * Undo the editing, by resetting the value upon when the spinbutton got focus.
 */
void
SpinButton::undo()
{
    set_value(on_focus_in_value);
}


} // namespace Widget
} // namespace UI
} // namespace Inkscape

/*
  Local Variables:
  mode:c++
  c-file-style:"stroustrup"
  c-file-offsets:((innamespace . 0)(inline-open . 0))
  indent-tabs-mode:nil
  fill-column:99
  End:
*/
// vim: filetype=c++:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :