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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QWidget>
#include <QMimeDatabase>
#include <QMimeType>
#include <QApplication>
#include <QPluginLoader>
#include <QDir>
#include "abstractviewer.h"
#include "viewerfactory.h"
#include "viewerinterfaces.h"
#include <concepts>
ViewerFactory::ViewerFactory(QWidget *displayWidget, QMainWindow *mainWindow, DefaultPolicy policy)
: m_defaultPolicy(policy),
m_displayWidget(displayWidget),
m_mainWindow(mainWindow)
{
Q_ASSERT(m_displayWidget);
Q_ASSERT(m_mainWindow);
loadViewerPlugins();
}
ViewerFactory::~ViewerFactory()
{
unload();
}
AbstractViewer *ViewerFactory::viewer(QFile *file) const
{
Q_ASSERT(file);
const QFileInfo info(*file);
QMimeDatabase db;
const auto mimeType = db.mimeTypeForFile(info);
AbstractViewer *viewer = ViewerFactory::viewer(mimeType);
if (!viewer) {
qWarning() << "Mime type" << mimeType.name() << "not supported.";
return nullptr;
}
viewer->init(file, m_displayWidget, m_mainWindow);
return viewer;
}
void ViewerFactory::loadViewerPlugins()
{
if (!m_viewers.isEmpty())
return;
// Load static plugins
const QObjectList &staticPlugins = QPluginLoader::staticInstances();
for (auto *plugin : staticPlugins)
addViewer(plugin);
// Load shared plugins
QDir pluginsDir = QDir(QApplication::applicationDirPath());
#if defined(Q_OS_WIN)
if (pluginsDir.dirName().toLower() == "debug" || pluginsDir.dirName().toLower() == "release")
pluginsDir.cdUp();
#elif defined(Q_OS_DARWIN)
if (pluginsDir.dirName() == "macOS") {
pluginsDir.cdUp();
pluginsDir.cdUp();
pluginsDir.cdUp();
}
#endif
const auto entryList = pluginsDir.entryList(QDir::Files);
for (const QString &fileName : entryList) {
QPluginLoader loader(pluginsDir.absoluteFilePath(fileName));
QObject *plugin = loader.instance();
if (plugin)
addViewer(plugin);
#if 0
else
qDebug() << loader.errorString();
#endif
}
}
void ViewerFactory::unload()
{
qDeleteAll(viewers());
m_viewers.clear();
}
void ViewerFactory::addViewer(QObject *viewerObject)
{
auto *interface = qobject_cast<ViewerInterface *>(viewerObject);
if (!interface)
return;
// Set custom default viewer
if (interface->viewer()->isDefaultViewer())
m_defaultViewer = interface->viewer();
m_viewers.insert(interface->viewerName(), interface->viewer());
}
QStringList ViewerFactory::viewerNames(bool showDefault) const
{
if (!showDefault)
return m_viewers.keys();
QStringList list;
for (auto it = m_viewers.constBegin(); it != m_viewers.constEnd(); ++it) {
QString name = it.key();
if ((m_defaultViewer && it.value()->isDefaultViewer())
|| (!m_defaultViewer && it.key() == "TxtViewer")) {
name += "(default)";
}
list.append(name);
}
return list;
}
ViewerFactory::ViewerList ViewerFactory::viewers() const
{
return m_viewers.values();
}
AbstractViewer *ViewerFactory::findViewer(const QString &viewerName) const
{
const ViewerList &viewerList = viewers();
for (auto *viewer : viewerList) {
if (viewer->viewerName() == viewerName)
return viewer;
}
qWarning() << "Plugin" << viewerName << "not loaded.";
return nullptr;
}
AbstractViewer *ViewerFactory::viewer(const QMimeType &mimeType) const
{
const ViewerList &viewerList = viewers();
for (AbstractViewer *viewer : viewerList) {
for (const QString &type : viewer->supportedMimeTypes()) {
if (mimeType.inherits(type))
return viewer;
}
}
return defaultViewer();
}
AbstractViewer *ViewerFactory::defaultViewer() const
{
switch (m_defaultPolicy) {
case DefaultPolicy::NeverDefault:
return nullptr;
case DefaultPolicy::DefaultToCustomViewer:
return m_defaultViewer ? m_defaultViewer : findViewer("TxtViewer");
case DefaultPolicy::DefaultToTxtViewer:
return findViewer("TxtViewer");
}
Q_UNREACHABLE();
}
QStringList ViewerFactory::supportedMimeTypes() const
{
static QStringList mimeTypes;
if (!mimeTypes.isEmpty())
return mimeTypes;
const ViewerList &viewerList = viewers();
for (auto viewer : viewerList)
mimeTypes.append(viewer->supportedMimeTypes());
return mimeTypes;
}
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