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