Reapply "ToolBar buttons to add and remove objects. (#18)"

This reverts commit 0c16b7d879.

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 +144,23 @@ 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().replace(".obj", ""),
+                                            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>