ToolBar buttons to add and remove objects.

src/app/qtkmainwindow.cpp

@@ -48,6 +48,16 @@ MainWindow::MainWindow(QWidget * parent) : QMainWindow(parent)
             &Qtk::ToolBox::updateFocus);
   }
 
+  connect(ui_->actionDelete_Object,
+          &QAction::triggered,
+          this,
+          &MainWindow::deleteObject);
+
+  connect(ui_->actionLoad_Model,
+          &QAction::triggered,
+          this,
+          &MainWindow::loadObject);
+
   // TODO: Fix / use MainWindow in Qt Designer to add these dock widgets.
   // For now we will add them manually, but we should be able to do this in the
   // designer. At the moment if you edit the UI in designer the dock widget
@@ -104,6 +114,26 @@ void MainWindow::refreshScene(const QString & sceneName)
   ui_->qtk__TreeView->updateView(getQtkWidget()->getScene());
 }
 
+void MainWindow::deleteObject()
+{
+  if (auto object = ui_->qtk__ToolBox->getObjectFocus(); object != Q_NULLPTR) {
+    auto scene = getQtkWidget()->getScene();
+    switch (object->getType()) {
+      case Qtk::Object::Type::QTK_MESH:
+        scene->removeObject(dynamic_cast<Qtk::MeshRenderer *>(object));
+        ui_->qtk__ToolBox->clearFocus();
+        break;
+      case Qtk::Object::Type::QTK_MODEL:
+        scene->removeObject(dynamic_cast<Qtk::Model *>(object));
+        ui_->qtk__ToolBox->clearFocus();
+        break;
+      default:
+        qDebug() << "Failed to delete model with invalid type";
+        break;
+    }
+  }
+}
+
 void MainWindow::setScene(Qtk::Scene * scene)
 {
   connect(scene,

src/app/qtkmainwindow.h

@@ -11,8 +11,8 @@
 
 #include <unordered_map>
 
+#include <QFileDialog>
 #include <QMainWindow>
-#include <QPlainTextEdit>
 
 #include "designer-plugins/debugconsole.h"
 
@@ -144,6 +144,22 @@ class MainWindow : public QMainWindow
      */
     void refreshScene(const QString & sceneName);
 
+
+    /**
+     * Opens a QFileDialog for selecting an object file to load into the scene.
+     */
+    void loadObject()
+    {
+      const QUrl file = QFileDialog::getOpenFileName(
+          this, tr("Load Model"), QDir::homePath(), tr("Object Files (*.obj)"));
+      getQtkWidget()->getScene()->loadModel(file.fileName(), file.toString());
+    }
+
+    /**
+     * Deletes the currently selected object from the scene.
+     */
+    void deleteObject();
+
   private:
     /***************************************************************************
      * Private Members

src/app/qtkmainwindow.ui

@@ -223,7 +223,7 @@
   </action>
   <action name="actionLoad_Model">
    <property name="enabled">
-    <bool>false</bool>
+    <bool>true</bool>
    </property>
    <property name="icon">
     <iconset>
@@ -238,7 +238,7 @@
   </action>
   <action name="actionDelete_Object">
    <property name="enabled">
-    <bool>false</bool>
+    <bool>true</bool>
    </property>
    <property name="icon">
     <iconset>

src/designer-plugins/toolbox.cpp

@@ -20,7 +20,7 @@ ToolBox::ToolBox(QWidget * parent) :
     QDockWidget(parent), objectDetails_(this), transformPanel_(this),
     scalePanel_(this), vertex_(this, "Vertex Shader:"),
     fragment_(this, "Fragment Shader:"), properiesForm_(new QFormLayout),
-    shaderForm_(new QFormLayout), ui(new Ui::ToolBox)
+    shaderForm_(new QFormLayout), ui(new Ui::ToolBox), objectFocus_(Q_NULLPTR)
 {
   ui->setupUi(this);
   setMinimumWidth(350);
@@ -44,10 +44,24 @@ void ToolBox::updateFocus(const QString & name)
 {
   auto object =
       QtkWidget::mWidgetManager.get_widget()->getScene()->getObject(name);
-  if (object != Q_NULLPTR) {
-    refreshProperties(object);
-    refreshShaders(object);
+  // If we can't find the object show a warning.
+  if (object == Q_NULLPTR) {
+    qDebug() << "Failed to find selected object: " << name
+             << ";  Clearing object panels.";
   }
+
+  // We should still pass the nullptr here if we failed to find the object
+  // above.
+  objectFocus_ = object;
+  refreshProperties(object);
+  refreshShaders(object);
+}
+
+void ToolBox::clearFocus()
+{
+  objectFocus_ = Q_NULLPTR;
+  refreshProperties(objectFocus_);
+  refreshShaders(objectFocus_);
 }
 
 ToolBox::SpinBox3D::SpinBox3D(QWidget * parent, const char * l) :
@@ -70,6 +84,13 @@ void ToolBox::SpinBox::disconnect() const
 
 void ToolBox::TransformPanel::setObject(const Qtk::Object * object)
 {
+  // Zero the panel contents if there is no object selected.
+  if (object == Q_NULLPTR) {
+    spinBox3D.clear();
+    return;
+  }
+
+
   // Reconnect translation panel controls to the new object.
   const std::vector binds = {&Object::setTranslationX,
                              &Object::setTranslationY,
@@ -90,6 +111,12 @@ void ToolBox::TransformPanel::setObject(const Qtk::Object * object)
 
 void ToolBox::ScalePanel::setObject(const Qtk::Object * object)
 {
+  // Zero the panel contents if there is no object selected.
+  if (object == Q_NULLPTR) {
+    spinBox3D.clear();
+    return;
+  }
+
   // Reconnect scale panel controls to the new object.
   const std::vector binds = {
       &Object::setScaleX, &Object::setScaleY, &Object::setScaleZ};
@@ -123,8 +150,21 @@ void ToolBox::refreshProperties(const Object * object)
 
 void ToolBox::refreshShaders(const Object * object)
 {
+  // Zero the panel contents if there is no object selected.
+  if (object == Q_NULLPTR) {
+    vertex_.clear();
+    fragment_.clear();
+    return;
+  }
+
   vertex_.path.setValue(object->getVertexShader().c_str());
   vertex_.editor->setText(object->getVertexShaderSourceCode().c_str());
   fragment_.path.setValue(object->getFragmentShader().c_str());
   fragment_.editor->setText(object->getFragmentShaderSourceCode().c_str());
 }
+
+void ToolBox::refresh(const Object * object)
+{
+  refreshProperties(object);
+  refreshShaders(object);
+}

src/designer-plugins/toolbox.h

@@ -18,8 +18,8 @@
 #include <QLabel>
 #include <QTextEdit>
 
+#include "qtk/object.h"
 
-#include "qtk/scene.h"
 
 namespace Ui
 {
@@ -45,8 +45,13 @@ namespace Qtk
 
       void refreshShaders(const Object * object);
 
+      void refresh(const Object * object);
+
       void updateFocus(const QString & name);
 
+      [[nodiscard]] Object * getObjectFocus() const { return objectFocus_; }
+
+      void clearFocus();
 
     private:
       /*************************************************************************
@@ -65,9 +70,9 @@ namespace Qtk
               {
               }
 
-              void setValue(const char * v) { value->setText(tr(v)); }
+              void setValue(const char * v) const { value->setText(tr(v)); }
 
-              void setItem(const char * l, const char * v)
+              void setItem(const char * l, const char * v) const
               {
                 label->setText(tr(l));
                 value->setText(tr(v));
@@ -84,8 +89,14 @@ namespace Qtk
           }
 
           /// Refresh to display the new object's details
-          void setObject(const Qtk::Object * object)
+          void setObject(const Qtk::Object * object) const
           {
+            // Zero contents if there is no object selected.
+            if (object == Q_NULLPTR) {
+              name.setValue("");
+              objectType.setValue("No object selected");
+              return;
+            }
             name.setItem("Name:", object->getName().toStdString().c_str());
             objectType.setItem(
                 "Type:",
@@ -119,6 +130,15 @@ namespace Qtk
           /// Assigning a QWidget to a QLayout also ensures Qt will clean up.
           explicit SpinBox3D(QWidget * parent, const char * l = "SpinBox3D:");
 
+          /// Zero the SpinBox3D display.
+          void clear()
+          {
+            for (auto & field : fields) {
+              field->disconnect();
+              field->spinBox->setValue(0.0);
+            }
+          }
+
           /// The main layout for the SpinBox3D widget.
           QHBoxLayout * layout;
 
@@ -176,6 +196,13 @@ namespace Qtk
             layout->addWidget(editor);
           }
 
+          /// Zero the ShaderView display.
+          void clear() const
+          {
+            path.setValue("");
+            editor->setText("");
+          }
+
           /// The main layout for the ShaderView widget.
           QVBoxLayout * layout;
 
@@ -190,6 +217,8 @@ namespace Qtk
       QFormLayout * properiesForm_;
       QFormLayout * shaderForm_;
 
+      Object * objectFocus_ {};
+
       Ui::ToolBox * ui;
   };
 }  // namespace Qtk

src/qtk/scene.cpp

@@ -55,6 +55,34 @@ template <> Model * Scene::addObject(Model * object)
   return object;
 }
 
+template <> void Scene::removeObject(MeshRenderer * object)
+{
+  auto it = std::find(mMeshes.begin(), mMeshes.end(), object);
+  if (it == mMeshes.end()) {
+    qDebug() << "[Scene::removeObject]: Failed to remove object: "
+             << object->getName() << " (" << object << ")";
+    return;
+  }
+
+  --mObjectCount[object->getName()];
+  mMeshes.erase(it);
+  emit sceneUpdated(mSceneName);
+}
+
+template <> void Scene::removeObject(Model * object)
+{
+  auto it = std::find(mModels.begin(), mModels.end(), object);
+  if (it == mModels.end()) {
+    qDebug() << "[Scene::removeObject]: Failed to remove object: "
+             << object->getName() << " (" << object << ")";
+    return;
+  }
+
+  --mObjectCount[object->getName()];
+  mModels.erase(it);
+  emit sceneUpdated(mSceneName);
+}
+
 void Scene::draw()
 {
   if (!mInit) {

src/qtk/scene.h

@@ -85,16 +85,16 @@ namespace Qtk
 
       void loadModel(const QUrl & url)
       {
-        auto fileName = url.fileName().replace(".obj", "").toStdString();
-        auto filePath = url.toLocalFile().toStdString();
+        auto fileName = url.fileName().replace(".obj", "");
+        auto filePath = url.toLocalFile();
         loadModel(fileName, filePath);
       }
 
-      void loadModel(const std::string & name, const std::string & path)
+      void loadModel(const QString & name, const QString & path)
       {
         // Add the dropped model to the load queue.
         // This is consumed during rendering of the scene if not empty.
-        mModelLoadQueue.emplace(name, path);
+        mModelLoadQueue.emplace(name.toStdString(), path.toStdString());
       }
 
       /*************************************************************************
@@ -182,8 +182,9 @@ namespace Qtk
 
       /**
        * Adds objects to the scene.
-       * This template provides explicit specializations for valid types.
-       * Adding any object other than these types will cause errors.
+       * This template provides explicit specializations for the valid types:
+       * 		MeshRenderer, Model
+       * Any other object type will cause errors.
        * TODO: Refactor to use Object base class container for scene objects.
        *
        * If creating a new object type for a scene, it must inherit Qtk::Object
@@ -194,6 +195,17 @@ namespace Qtk
        */
       template <typename T> T * addObject(T * object);
 
+      /**
+       * Removes an object from the scene.
+       * This template provides explicit specializations for the valid types:
+       * 		MeshRenderer, Model
+       * Any other object type will cause errors.
+       * TODO: Refactor to use Object base class container for scene objects.
+       *
+       * @param object Pointer to the object to remove from the scene.
+       */
+      template <typename T> void removeObject(T * object);
+
       /**
        * @param name The name to use for this scene.
        */