Implement Plugin Loading.

This commit adds plugin laoding which are then added as sub winows onto the main window.
This commit also adds 2 plugins however more will follow

CMakeLists.txt

@@ -11,6 +11,7 @@ qt_add_executable(SOM
     src/mainwindow.cpp
     src/mainwindow.h
     src/mainwindow.ui
+    src/interface.h
 )
 
 target_link_libraries(SOM
@@ -19,6 +20,8 @@ target_link_libraries(SOM
         Qt::Widgets
 )
 
+add_subdirectory(plugins)
+
 include(GNUInstallDirs)
 
 install(TARGETS SOM

plugins/CMakeLists.txt

@@ -0,0 +1,2 @@
+add_subdirectory(WebBrowserPlugin)
+add_subdirectory(TerminalPlugin)

plugins/TerminalPlugin/CMakeLists.txt

@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.16)
+project(TerminalPlugin VERSION 1.0 LANGUAGES C CXX)
+
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+
+include(GNUInstallDirs)
+
+find_package(QT NAMES Qt6 REQUIRED COMPONENTS Core)
+find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Gui Widgets)
+
+qt_add_plugin(TerminalPlugin)
+target_sources(TerminalPlugin PRIVATE
+    TerminalPlugin.cpp TerminalPlugin.h
+)
+
+target_link_libraries(TerminalPlugin PRIVATE
+    Qt::Core
+    Qt::Gui
+    Qt::Widgets
+    qtermwidget6
+)

plugins/TerminalPlugin/TerminalPlugin.cpp

@@ -0,0 +1,38 @@
+#include "TerminalPlugin.h"
+#include <QVBoxLayout>
+#include <QWidget>
+#include <QApplication>
+
+
+QString TerminalPlugin::pname()
+{
+    return "Terminal Plugin";
+}
+
+QString TerminalPlugin::pdesc()
+{
+    return "Simple Terminal Plugin.";
+}
+
+QWidget* TerminalPlugin::pcontent()
+{
+    QWidget *test = new QWidget();
+    QVBoxLayout *mainLayout = new QVBoxLayout;
+    console = new QTermWidget(test);
+
+    QFont font = QApplication::font();
+    font.setFamily("Monospace");
+    font.setPointSize(12);
+
+    console->setTerminalFont(font);
+    console->setScrollBarPosition(QTermWidget::ScrollBarRight);
+    console->setColorScheme("WhiteOnBlack");
+
+    test->setWindowTitle(tr("Terminal Plugin"));
+    test->resize(600, 400);
+    mainLayout->addWidget(console);
+    test->setLayout(mainLayout);
+    QIcon icon = QIcon(":/images/monkey.png");
+    test->setWindowIcon(icon);
+    return test;
+}

plugins/TerminalPlugin/TerminalPlugin.h

@@ -0,0 +1,29 @@
+#ifndef TESTPLUGIN_H
+#define TESTPLUGIN_H
+
+
+#include <../../src/interface.h>
+#include <qtermwidget6/qtermwidget.h>
+
+#include <QObject>
+#include <QtPlugin>
+#include <QString>
+#include <QWidget>
+#include <QImage>
+
+class TerminalPlugin : public QObject, public Interface
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID "org.SOM.Interface" FILE "TerminalPlugin.json")
+    Q_INTERFACES(Interface)
+
+public:
+    QString pname()  override;
+    QString pdesc()  override;
+    QWidget *pcontent()  override;
+
+private:
+    QTermWidget *console;
+
+};
+#endif

plugins/TerminalPlugin/TerminalPlugin.json

@@ -0,0 +1 @@
+{}

plugins/WebBrowserPlugin/CMakeLists.txt

@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.16)
+project(WebBrowserPlugin VERSION 1.0 LANGUAGES C CXX)
+
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+
+include(GNUInstallDirs)
+
+find_package(QT NAMES Qt6 REQUIRED COMPONENTS Core)
+find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Gui WebEngineWidgets Widgets)
+
+qt_add_plugin(WebBrowserPlugin)
+target_sources(WebBrowserPlugin PRIVATE
+    WebBrowserPlugin.cpp WebBrowserPlugin.h
+)
+
+target_link_libraries(WebBrowserPlugin PRIVATE
+    Qt::Core
+    Qt::Gui
+    Qt::WebEngineWidgets
+    Qt::Widgets
+)

plugins/WebBrowserPlugin/WebBrowserPlugin.cpp

@@ -0,0 +1,78 @@
+#include "WebBrowserPlugin.h"
+#include <QVBoxLayout>
+#include <QWidget>
+
+QString WebBrowserPlugin::pname()
+{
+    return "Web Browser Plugin";
+}
+
+QString WebBrowserPlugin::pdesc()
+{
+    return "Simple Web Browser Plugin.";
+}
+
+QWidget* WebBrowserPlugin::pcontent()
+{
+    QWidget *test = new QWidget();
+    test->setWindowTitle(tr("Web Browser Plugin"));
+    test->resize(1024, 750);
+    QVBoxLayout *mainLayout = new QVBoxLayout;
+
+    view = new QWebEngineView(test);
+    view->setUrl(QUrl("https://rubenwardy.com/minetest_modding_book/en/index.html"));
+    view->resize(1024, 750);
+
+    horizontalGroupBox = new QGroupBox();
+    QHBoxLayout *layout = new QHBoxLayout;
+    back = new QPushButton(tr("Back"));
+            layout->addWidget(back);
+    connect(back, &QPushButton::clicked, this, &WebBrowserPlugin::backpage);
+
+    forward = new QPushButton(tr("Forward"));
+            layout->addWidget(forward);
+    connect(forward, &QPushButton::clicked, this, &WebBrowserPlugin::forwardpage);
+
+    refresh = new QPushButton(tr("Refresh"));
+            layout->addWidget(refresh);
+    connect(refresh, &QPushButton::clicked, this, &WebBrowserPlugin::refreshpage);
+
+    smallEditor = new QLineEdit;
+    layout->addWidget(smallEditor);
+    smallEditor->setText("https://rubenwardy.com/minetest_modding_book/en/index.html");
+
+    go = new QPushButton(tr("Go"));
+            layout->addWidget(go);
+    connect(go, &QPushButton::clicked, this, &WebBrowserPlugin::gotourl);
+
+    horizontalGroupBox->setLayout(layout);
+
+
+    mainLayout->addWidget(horizontalGroupBox);
+    mainLayout->addWidget(view,1);
+    test->setLayout(mainLayout);
+
+    QIcon icon = QIcon(":/images/monkey.png");
+    test->setWindowIcon(icon);
+    return test;
+}
+
+void WebBrowserPlugin::gotourl()
+{
+    view->setUrl(QUrl(smallEditor->text()));
+}
+
+void WebBrowserPlugin::refreshpage()
+{
+    view->reload();
+}
+
+void WebBrowserPlugin::backpage()
+{
+    view->back();
+}
+
+void WebBrowserPlugin::forwardpage()
+{
+    view->forward();
+}

plugins/WebBrowserPlugin/WebBrowserPlugin.h

@@ -0,0 +1,35 @@
+#ifndef WEBBROWSERPLUGIN_H
+#define WEBBROWSERPLUGIN_H
+
+
+#include <../../src/interface.h>
+#include <QWebEngineView>
+#include <QtWidgets>
+
+class WebBrowserPlugin : public QObject, public Interface
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID "org.SOM.Interface" FILE "WebBrowserPlugin.json")
+    Q_INTERFACES(Interface)
+
+public:
+    QString pname()  override;
+    QString pdesc()  override;
+    QWidget *pcontent()  override;
+
+private:
+    QGroupBox *horizontalGroupBox;
+    QPushButton *back;
+    QPushButton *forward;
+    QPushButton *refresh;
+    QLineEdit *smallEditor;
+    QPushButton *go;
+    QWebEngineView *view;
+
+private slots:
+    void gotourl();
+    void refreshpage();
+    void backpage();
+    void forwardpage();
+};
+#endif

plugins/WebBrowserPlugin/WebBrowserPlugin.json

@@ -0,0 +1 @@
+{}

src/interface.h

@@ -0,0 +1,16 @@
+#include <QtPlugin>
+
+#include <QWidget>
+#include <QString>
+
+class Interface
+{
+public:
+    virtual ~Interface() = default;
+    virtual QString pname()  = 0;
+    virtual QString pdesc()  = 0;
+    virtual QWidget* pcontent() = 0;
+};
+
+#define Interface_iid "org.SOM.Interface/1.0"
+Q_DECLARE_INTERFACE(Interface, Interface_iid)

src/mainwindow.cpp

@@ -10,6 +10,9 @@ MainWindow::MainWindow(QWidget *parent)
     createMenus();
     this->setWindowIcon(QIcon::fromTheme(QIcon::ThemeIcon::Computer));
     initSettings();
+    mdi = new QMdiArea;
+    this->setCentralWidget(mdi);
+    loadPlugins();
 }
 
 MainWindow::~MainWindow()
@@ -90,3 +93,54 @@ void MainWindow::settings()
     settingsWin->resize(300, 200);
     settingsWin->show();
 }
+
+void MainWindow::loadPlugins()
+{
+    pluginsDir = QDir(QCoreApplication::applicationDirPath());
+    pluginsDir.cd("plugins");
+
+    const auto entryList = pluginsDir.entryList(QDir::Files);
+    for (const QString &fileName : entryList) {
+
+        QPluginLoader loader(pluginsDir.absoluteFilePath(fileName));
+        QObject *plugin = loader.instance();
+        if (plugin) {
+
+            populateMenu(plugin);
+            pluginFileNames += fileName;
+        }
+    }
+}
+
+void MainWindow::changePlugin()
+{
+    auto action = qobject_cast<QAction *>(sender());
+    if (!action)
+        return;
+
+    auto iPlugin = qobject_cast<Interface *>(action->parent());
+    if (!iPlugin)
+        return;
+
+    QWidget* pluginContent = iPlugin->pcontent();
+    auto *sub = mdi->addSubWindow(pluginContent);
+    sub->setAttribute(Qt::WA_DeleteOnClose);
+    sub->show();
+}
+
+void MainWindow::populateMenu(QObject *plugin)
+{
+
+    auto iPlugin = qobject_cast<Interface *>(plugin);
+    if (iPlugin)
+
+    addToMenu(plugin, iPlugin->pname(), toolsMenu, &MainWindow::changePlugin);
+}
+
+void MainWindow::addToMenu(QObject *plugin, const QString &text,
+                       QMenu *menu, Member member)
+{
+    auto action = new QAction(text, plugin);
+    connect(action, &QAction::triggered, this, member);
+    menu->addAction(action);
+}

src/mainwindow.h

@@ -4,6 +4,8 @@
 #include <QMainWindow>
 #include <QtWidgets>
 
+#include "interface.h"
+
 QT_BEGIN_NAMESPACE
 namespace Ui {
 class MainWindow;
@@ -22,11 +24,15 @@ public:
     ~MainWindow();
 
 private:
+    typedef void (MainWindow::*Member)();
     Ui::MainWindow *ui;
     void createActions();
     void createMenus();
     void initSettings();
     void saveSettings();
+    void loadPlugins();
+    void populateMenu(QObject *plugin);
+    void addToMenu(QObject *plugin, const QString &text, QMenu *menu,Member member);
     QMenu *fileMenu;
     QMenu *editMenu;
     QMenu *toolsMenu;
@@ -35,10 +41,14 @@ private:
     QAction *aboutAct;
     QAction *aboutQtAct;
     QAction *settingsAct;
+    QStringList pluginFileNames;
+    QDir pluginsDir;
+    QMdiArea *mdi;
 
 private slots:
     void about();
     void settings();
+    void changePlugin();
 
 protected:
     void closeEvent(QCloseEvent *event) override;