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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "grid_p.h"
#include <QtCore/qlist.h>
#include <QtCore/qstring.h>
#include <QtCore/qvariant.h>
#include <QtCore/qmap.h>
#include <QtGui/qevent.h>
#include <QtGui/qpainter.h>
#include <QtWidgets/qwidget.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 auto it = v.constFind(key);
const bool found = it != v.constEnd();
if (found)
value = qvariant_cast<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)
{
Grid grid;
bool anyData = valueFromVariantMap(vm, QLatin1StringView(KEY_VISIBLE), grid.m_visible);
anyData |= valueFromVariantMap(vm, QLatin1StringView(KEY_SNAPX), grid.m_snapX);
anyData |= valueFromVariantMap(vm, QLatin1StringView(KEY_SNAPY), grid.m_snapY);
anyData |= valueFromVariantMap(vm, QLatin1StringView(KEY_DELTAX), grid.m_deltaX);
anyData |= valueFromVariantMap(vm, QLatin1StringView(KEY_DELTAY), grid.m_deltaY);
if (!anyData)
return false;
if (grid.m_deltaX == 0 || grid.m_deltaY == 0) {
qWarning("Attempt to set invalid grid with a spacing of 0.");
return false;
}
*this = grid;
return true;
}
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, QLatin1StringView(KEY_VISIBLE), vm, forceKeys);
valueToVariantMap(m_snapX, defaultSnap, QLatin1StringView(KEY_SNAPX), vm, forceKeys);
valueToVariantMap(m_snapY, defaultSnap, QLatin1StringView(KEY_SNAPY), vm, forceKeys);
valueToVariantMap(m_deltaX, DEFAULT_GRID, QLatin1StringView(KEY_DELTAX), vm, forceKeys);
valueToVariantMap(m_deltaY, DEFAULT_GRID, QLatin1StringView(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();
using Points = QList<QPointF>;
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.size());
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;
}
}
QT_END_NAMESPACE
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