LineEdit.cpp

/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2014 Robert Osfield
 *
 * This library is open source and may be redistributed and/or modified under
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 *
 * 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
 * OpenSceneGraph Public License for more details.
*/


#include <osgUI/LineEdit>
#include <osgText/String>
#include <osgText/Font>
#include <osgText/Text>
#include <osg/Notify>

using namespace osgUI;

LineEdit::LineEdit()
{
}

LineEdit::LineEdit(const osgUI::LineEdit& label, const osg::CopyOp& copyop):
    Widget(label, copyop),
    _text(label._text)
{
}

bool LineEdit::handleImplementation(osgGA::EventVisitor* ev, osgGA::Event* event)
{
    if (!getHasEventFocus()) return false;

    osgGA::GUIEventAdapter* ea = event->asGUIEventAdapter();
    if (!ea) return false;

    switch(ea->getEventType())
    {
        case(osgGA::GUIEventAdapter::KEYDOWN):
            if (ea->getKey()==osgGA::GUIEventAdapter::KEY_BackSpace ||
                ea->getKey()==osgGA::GUIEventAdapter::KEY_Delete)
            {
                if (!_text.empty())
                {
                    _text.erase(_text.size()-1, 1);
                    if (_textDrawable) _textDrawable->setText(_text);
                    return true;

                }
            }
            else if (ea->getKey()>=32 && ea->getKey()<=0xff00)
            {
                _text.push_back(ea->getKey());
                if (_textDrawable) _textDrawable->setText(_text);
                return true;
            }

            OSG_NOTICE<<"Key pressed : "<<ea->getKey()<<std::endl;

            break;
        default:
            break;
    }

    return false;
}

void LineEdit::setText(const std::string& text)
{
    _text = text;
    if (_textDrawable) _textDrawable->setText(_text);
}

void LineEdit::enterImplementation()
{
    OSG_NOTICE<<"LineEdit enter"<<std::endl;
    if (_backgroundSwitch.valid()) _backgroundSwitch->setSingleChildOn(1);
}


void LineEdit::leaveImplementation()
{
    OSG_NOTICE<<"LineEdit leave"<<std::endl;
    if (_backgroundSwitch.valid()) _backgroundSwitch->setSingleChildOn(0);
}


void LineEdit::createGraphicsImplementation()
{
    Style* style = (getStyle()!=0) ? getStyle() : Style::instance().get();

    osg::ref_ptr<osg::Group> group = new osg::Group;

    osg::BoundingBox extents(_extents);
    float unFocused = 0.92;
    float withFocus = 0.97;

    osg::Vec4 frameColor(unFocused,unFocused,unFocused,1.0f);

    bool requiresFrame = (getFrameSettings() && getFrameSettings()->getShape()!=osgUI::FrameSettings::NO_FRAME);
    if (requiresFrame)
    {
        group->addChild(style->createFrame(_extents, getFrameSettings(), frameColor));
        extents.xMin() += getFrameSettings()->getLineWidth();
        extents.xMax() -= getFrameSettings()->getLineWidth();
        extents.yMin() += getFrameSettings()->getLineWidth();
        extents.yMax() -= getFrameSettings()->getLineWidth();
    }

    // clear background of edit region
    _backgroundSwitch = new osg::Switch;
    _backgroundSwitch->addChild(style->createPanel(extents, osg::Vec4(unFocused, unFocused,unFocused, 1.0)));
    _backgroundSwitch->addChild(style->createPanel(extents, osg::Vec4(withFocus,withFocus,withFocus,1.0)));
    _backgroundSwitch->setSingleChildOn(0);
    group->addChild(_backgroundSwitch.get());

    osg::ref_ptr<Node> node = style->createText(extents, getAlignmentSettings(), getTextSettings(), _text);
    _textDrawable = dynamic_cast<osgText::Text*>(node.get());
    _textDrawable->setDataVariance(osg::Object::DYNAMIC);
    group->addChild(node.get());

    style->setupClipStateSet(_extents, getOrCreateStateSet());

    setGraphicsSubgraph(0, group.get());
}