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/*
* Copyright 2016 Igor Kushnir <igorkuo@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License or (at your option) version 3 or any later version
* accepted by the membership of KDE e.V. (or its successor approved
* by the membership of KDE e.V.), which shall act as a proxy
* defined in Section 14 of version 3 of the license.
*
* This program 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
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "zoomcontroller.h"
#include <KConfigGroup>
#include <QPoint>
#include <QKeyEvent>
#include <QWheelEvent>
#include <cmath>
namespace {
constexpr const char* factorConfigEntryKey() { return "Zoom Factor"; }
constexpr double defaultFactor{1};
constexpr double defaultMultiplier{1.1};
double multiplier(double scale)
{
// Allow finer-grained control over zoom factor compared to defaultMultiplier
constexpr double smallMultiplier{1.05};
return std::pow(smallMultiplier, scale);
}
} // namespace
using KDevelop::ZoomControllerPrivate;
using KDevelop::ZoomController;
class KDevelop::ZoomControllerPrivate
{
public:
explicit ZoomControllerPrivate(const KConfigGroup& configGroup);
void writeConfig();
KConfigGroup m_configGroup;
double m_factor{defaultFactor};
};
ZoomControllerPrivate::ZoomControllerPrivate(const KConfigGroup& configGroup)
: m_configGroup{configGroup}
{
m_factor = m_configGroup.readEntry(factorConfigEntryKey(), defaultFactor);
}
void ZoomControllerPrivate::writeConfig()
{
m_configGroup.writeEntry(factorConfigEntryKey(), m_factor);
m_configGroup.sync();
}
ZoomController::ZoomController(const KConfigGroup& configGroup, QObject* parent)
: QObject(parent)
, d_ptr{new ZoomControllerPrivate(configGroup)}
{
}
ZoomController::~ZoomController() = default;
double ZoomController::factor() const
{
Q_D(const ZoomController);
return d->m_factor;
}
void ZoomController::setFactor(double factor)
{
Q_D(ZoomController);
factor = qBound(0.1, factor, 10.0);
if (d->m_factor == factor) {
return;
}
d->m_factor = factor;
d->writeConfig();
emit factorChanged(d->m_factor);
}
void ZoomController::zoomBy(double scale)
{
Q_D(ZoomController);
setFactor(d->m_factor * multiplier(scale));
}
bool ZoomController::handleKeyPressEvent(QKeyEvent* event)
{
Q_ASSERT(event);
const auto requiredModifiers = Qt::ControlModifier;
if (!(event->modifiers() & requiredModifiers)) {
return false;
}
// Qt::ShiftModifier is required for the 0 key in some keyboard layouts
// (such as Programmer Dvorak). Allow Qt::KeypadModifier to support numpad keys.
// Don't allow other modifiers, such as Alt and Meta, to minimize shortcut conflicts.
const auto allowedModifiers = Qt::ControlModifier | Qt::ShiftModifier | Qt::KeypadModifier;
if (event->modifiers() & ~allowedModifiers) {
return false;
}
if (event->key() == Qt::Key_0) {
resetZoom();
event->accept();
return true;
}
return false;
}
bool ZoomController::handleWheelEvent(QWheelEvent* event)
{
Q_ASSERT(event);
if (!(event->modifiers() & Qt::ControlModifier)) {
return false;
}
constexpr double minStandardDelta{120};
const QPoint delta = event->angleDelta();
const double scale{(delta.x() + delta.y()) / minStandardDelta};
zoomBy(scale);
event->accept();
return true;
}
void ZoomController::zoomIn()
{
Q_D(ZoomController);
setFactor(d->m_factor * defaultMultiplier);
}
void ZoomController::zoomOut()
{
Q_D(ZoomController);
setFactor(d->m_factor / defaultMultiplier);
}
void ZoomController::resetZoom()
{
setFactor(defaultFactor);
}
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