Improve cmake and GUI (#13)

+ Packaging and CI for Windows, Mac, Linux
+ Debian package, NSIS Windows installer, OSX appbundle
+ Example application using libqtk
+ Component installation for `qtk`, `libqtk`, or `collection` with cmake

src/app/qtkmainwindow.cpp

@@ -0,0 +1,80 @@
+/*##############################################################################
+## Author: Shaun Reed                                                         ##
+## Legal: All Content (c) 2023 Shaun Reed, all rights reserved                ##
+## About: MainWindow for Qtk application                                      ##
+##                                                                            ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0   ##
+##############################################################################*/
+
+#include "qtkmainwindow.h"
+#include "qtkscene.h"
+#include "ui_qtkmainwindow.h"
+
+MainWindow * MainWindow::mainWindow_ = Q_NULLPTR;
+
+/*******************************************************************************
+ * Constructors / Destructors
+ ******************************************************************************/
+
+MainWindow::MainWindow(QWidget * parent) : QMainWindow(parent) {
+  ui_ = new Ui::MainWindow;
+  setObjectName("MainWindow");
+  // For use in design mode using Qt Creator
+  // + We can use the `ui` member to access nested widgets by name
+  ui_->setupUi(this);
+  ui_->menuView->addAction(ui_->toolBar->toggleViewAction());
+
+  // Initialize static container for all active QtkWidgets
+  auto qtkWidgets = findChildren<Qtk::QtkWidget *>();
+  for(auto & qtkWidget : qtkWidgets) {
+    qtkWidget->setScene(new Qtk::SceneEmpty);
+    views_.emplace(qtkWidget->getScene()->getSceneName(), qtkWidget);
+    ui_->menuView->addAction(qtkWidget->getActionToggleConsole());
+    connect(
+        qtkWidget->getScene(), &Qtk::Scene::sceneUpdated, this,
+        &MainWindow::refreshScene);
+  }
+
+  auto docks = findChildren<QDockWidget *>();
+  for(auto & dock : docks) {
+    addDockWidget(Qt::RightDockWidgetArea, dock);
+    ui_->menuView->addAction(dock->toggleViewAction());
+  }
+
+  // Set the window icon used for Qtk.
+  setWindowIcon(Qtk::getIcon());
+}
+
+MainWindow::~MainWindow() {
+  delete ui_;
+}
+
+/*******************************************************************************
+ * Public Methods
+ ******************************************************************************/
+
+MainWindow * MainWindow::getMainWindow() {
+  if(mainWindow_ == Q_NULLPTR) {
+    mainWindow_ = new MainWindow;
+  }
+  return mainWindow_;
+}
+
+Qtk::QtkWidget * MainWindow::getQtkWidget(int64_t index) {
+  if(views_.size() <= index) {
+    return Q_NULLPTR;
+  }
+  return views_.begin(index)->second;
+}
+
+Qtk::QtkWidget * MainWindow::getQtkWidget(const QString & name) {
+  if(!views_.count(name)) {
+    return Q_NULLPTR;
+  }
+  return views_[name];
+}
+
+void MainWindow::refreshScene(QString sceneName) {
+  // TODO: Select TreeView using sceneName>
+  ui_->qtk__TreeView->updateView(getQtkWidget()->getScene());
+}