/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the Qt Designer of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include "grid_p.h"+
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+
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#include <QtCore/QString>+
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#include <QtCore/QVector>+
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#include <QtGui/QPainter>+
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#include <QtGui/QWidget>+
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#include <QtGui/qevent.h>+
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+
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QT_BEGIN_NAMESPACE+
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+
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static const bool defaultSnap = true;+
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static const bool defaultVisible = true;+
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static const int DEFAULT_GRID = 10;+
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static const char* KEY_VISIBLE = "gridVisible";+
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static const char* KEY_SNAPX =  "gridSnapX";+
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static const char* KEY_SNAPY =  "gridSnapY";+
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static const char* KEY_DELTAX =  "gridDeltaX";+
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static const char* KEY_DELTAY =  "gridDeltaY";+
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+
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// Insert a value into the serialization map unless default+
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template <class T>+
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    static inline void valueToVariantMap(T value, T defaultValue, const QString &key, QVariantMap &v, bool forceKey) {+
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        if (forceKey || value != defaultValue)+
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            v.insert(key, QVariant(value));+
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    }+
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+
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// Obtain a value form QVariantMap+
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template <class T>+
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    static inline bool valueFromVariantMap(const QVariantMap &v, const QString &key, T &value) {+
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        const QVariantMap::const_iterator it = v.constFind(key);+
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        const bool found = it != v.constEnd();+
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        if (found)+
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            value = qVariantValue<T>(it.value());+
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        return found;+
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    }+
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+
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namespace qdesigner_internal+
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{+
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+
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Grid::Grid() :+
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    m_visible(defaultVisible),+
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    m_snapX(defaultSnap),+
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    m_snapY(defaultSnap),+
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    m_deltaX(DEFAULT_GRID),+
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    m_deltaY(DEFAULT_GRID)+
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{+
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}+
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+
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bool Grid::fromVariantMap(const QVariantMap& vm)+
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{+
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    *this = Grid();+
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    valueFromVariantMap(vm, QLatin1String(KEY_VISIBLE), m_visible);+
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    valueFromVariantMap(vm, QLatin1String(KEY_SNAPX), m_snapX);+
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    valueFromVariantMap(vm, QLatin1String(KEY_SNAPY), m_snapY);+
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    valueFromVariantMap(vm, QLatin1String(KEY_DELTAX), m_deltaX);+
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    return valueFromVariantMap(vm, QLatin1String(KEY_DELTAY), m_deltaY);+
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}+
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+
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QVariantMap Grid::toVariantMap(bool forceKeys) const+
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{+
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    QVariantMap rc;+
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    addToVariantMap(rc, forceKeys);+
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    return rc;+
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}+
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+
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void  Grid::addToVariantMap(QVariantMap& vm, bool forceKeys) const+
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{+
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    valueToVariantMap(m_visible, defaultVisible, QLatin1String(KEY_VISIBLE), vm, forceKeys);+
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    valueToVariantMap(m_snapX, defaultSnap, QLatin1String(KEY_SNAPX), vm, forceKeys);+
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    valueToVariantMap(m_snapY, defaultSnap, QLatin1String(KEY_SNAPY), vm, forceKeys);+
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    valueToVariantMap(m_deltaX, DEFAULT_GRID, QLatin1String(KEY_DELTAX), vm, forceKeys);+
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    valueToVariantMap(m_deltaY, DEFAULT_GRID, QLatin1String(KEY_DELTAY), vm, forceKeys);+
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}+
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+
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void Grid::paint(QWidget *widget, QPaintEvent *e) const+
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{+
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    QPainter p(widget);+
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    paint(p, widget, e);+
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}+
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+
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void Grid::paint(QPainter &p, const QWidget *widget, QPaintEvent *e) const+
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{+
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    p.setPen(widget->palette().dark().color());+
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+
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    if (m_visible) {+
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        const int xstart = (e->rect().x() / m_deltaX) * m_deltaX;+
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        const int ystart = (e->rect().y() / m_deltaY) * m_deltaY;+
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+
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        const int xend = e->rect().right();+
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        const int yend = e->rect().bottom();+
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+
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        typedef QVector<QPointF> Points;+
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        static Points points;+
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        points.clear();+
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+
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        for (int x = xstart; x <= xend; x += m_deltaX) {+
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            points.reserve((yend - ystart) / m_deltaY + 1);+
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            for (int y = ystart; y <= yend; y += m_deltaY)+
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                points.push_back(QPointF(x, y));+
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            p.drawPoints( &(*points.begin()), points.count());+
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            points.clear();+
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        }+
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    }+
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}+
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+
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int Grid::snapValue(int value, int grid) const+
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{+
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    const int rest = value % grid;+
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    const int absRest = (rest < 0) ? -rest : rest;+
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    int offset = 0;+
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    if (2 * absRest > grid)+
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        offset = 1;+
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    if (rest < 0)+
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        offset *= -1;+
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    return (value / grid + offset) * grid;+
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}+
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+
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QPoint Grid::snapPoint(const QPoint &p) const+
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{+
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    const int sx = m_snapX ? snapValue(p.x(), m_deltaX) : p.x();+
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    const int sy = m_snapY ? snapValue(p.y(), m_deltaY) : p.y();+
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    return QPoint(sx, sy);+
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}+
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+
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int Grid::widgetHandleAdjustX(int x) const+
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{+
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    return m_snapX ? (x / m_deltaX) * m_deltaX + 1 : x;+
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}+
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+
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int Grid::widgetHandleAdjustY(int y) const+
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{+
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    return m_snapY ? (y / m_deltaY) * m_deltaY + 1 : y;+
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}+
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+
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bool Grid::equals(const Grid &rhs) const+
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{+
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    return m_visible == rhs.m_visible &&+
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           m_snapX   == rhs.m_snapX &&+
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           m_snapY   == rhs.m_snapY &&+
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           m_deltaX  == rhs.m_deltaX &&+
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           m_deltaY  == rhs.m_deltaY;+
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}+
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}+
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+
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QT_END_NAMESPACE+
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