clean up initialization code

mainwindow.cpp

@@ -3,29 +3,32 @@
 #include <QMenu>
 #include <QMenuBar>
 #include <QLabel>
+#include <QStackedLayout>
+#include <QDebug>
 #include "mainwindow.h"
 #include "components/flatbutton.h"
 #include "components/iconbutton.h"
 #include "components/appbar.h"
+#include "examples/about.h"
+#include "examples/flatbuttonexamples.h"
+#include "examples/iconbuttonexamples.h"
+#include "examples/appbarexamples.h"
 
 MainWindow::MainWindow(QWidget *parent)
-    : QMainWindow(parent)
+    : QMainWindow(parent),
+      _layout(new QStackedLayout),
+      _flatButtonExamples(new FlatButtonExamples),
+      _iconButtonExamples(new IconButtonExamples),
+      _appBarExamples(new AppBarExamples),
+      _about(new About)
 {
-    QMenu *components = new QMenu("Components");
+    _initWidget();
-    components->addAction("AppBar");
+    _initMenu();
-
-    QMenu *buttons = new QMenu("Buttons");
-    components->addMenu(buttons);
-
-    buttons->addAction("FlatButton");
-    buttons->addAction("IconButton");
-
-    components->addAction("Tabs");
-
-    menuBar()->addMenu(components);
 
     // -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
 
+
+    /*
     QVBoxLayout *layout = new QVBoxLayout;
     QWidget *widget = new QWidget;
     widget->setLayout(layout);
@@ -69,8 +72,52 @@ MainWindow::MainWindow(QWidget *parent)
     button2->setIcon(icon);
 
     // -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
+    */
 }
 
 MainWindow::~MainWindow()
 {
 }
+
+void MainWindow::showWidget(QAction *action)
+{
+    QString text(action->text());
+    if ("AppBar" == text) {
+        _layout->setCurrentWidget(_about);
+    } else if ("FlatButton" == text) {
+        _layout->setCurrentWidget(_flatButtonExamples);
+    } else if ("IconButton" == text) {
+        _layout->setCurrentWidget(_about);
+    } else {
+        _layout->setCurrentWidget(_about);
+    }
+}
+
+void MainWindow::_initWidget()
+{
+    QWidget *widget = new QWidget;
+    widget->setLayout(_layout);
+
+    _layout->addWidget(_about);
+    _layout->addWidget(_flatButtonExamples);
+
+    setCentralWidget(widget);
+}
+
+void MainWindow::_initMenu() const
+{
+    QMenu *components = new QMenu("Components");
+    components->addAction("AppBar");
+
+    QMenu *buttons = new QMenu("Buttons");
+    components->addMenu(buttons);
+
+    buttons->addAction("FlatButton");
+    buttons->addAction("IconButton");
+
+    components->addAction("Tabs");
+
+    menuBar()->addMenu(components);
+
+    connect(components, SIGNAL(triggered(QAction *)), this, SLOT(showWidget(QAction *)));
+}

mainwindow.h

@@ -3,6 +3,12 @@
 
 #include <QMainWindow>
 
+class About;
+class FlatButtonExamples;
+class IconButtonExamples;
+class AppBarExamples;
+class QStackedLayout;
+
 class MainWindow : public QMainWindow
 {
     Q_OBJECT
@@ -10,6 +16,19 @@ class MainWindow : public QMainWindow
 public:
     explicit MainWindow(QWidget *parent = 0);
     ~MainWindow();
+
+protected slots:
+    void showWidget(QAction *action);
+
+private:
+    void _initWidget();
+    void _initMenu() const;
+
+    QStackedLayout     *const _layout;
+    FlatButtonExamples *const _flatButtonExamples;
+    IconButtonExamples *const _iconButtonExamples;
+    AppBarExamples     *const _appBarExamples;
+    About              *const _about;
 };
 
 #endif // MAINWINDOW_H