create AppBar example

examples/appbarexamples.cpp

@@ -1,8 +1,41 @@
+#include <QVBoxLayout>
 #include "appbarexamples.h"
+#include "components/appbar.h"
+#include "frame.h"
 
 AppBarExamples::AppBarExamples(QWidget *parent)
     : ExampleList(parent)
 {
+    QLayout *mainLayout = widget()->layout();
+
+    {
+        QWidget *widget = new QWidget;
+        QVBoxLayout *layout = new QVBoxLayout;
+
+        widget->setLayout(layout);
+
+        AppBar *appBar = new AppBar;
+        layout->addWidget(appBar);
+        layout->addStretch();
+        layout->setContentsMargins(0, 0, 0, 0);
+
+        QScrollArea *area = new QScrollArea;
+        area->setWidget(widget);
+        area->setWidgetResizable(true);
+        area->setBackgroundRole(QPalette::Base);
+
+        Frame *frame = new Frame;
+        frame->setCodeSnippet(
+            "QVBoxLayout *layout = new QVBoxLayout;\n"
+            "AppBar *appBar = new AppBar;\n"
+            "layout->addWidget(appBar);\n"
+            "layout->addStretch();\n"
+            "layout->setContentsMargins(0, 0, 0, 0);"
+        );
+        frame->setWidget(area);
+
+        mainLayout->addWidget(frame);
+    }
 }
 
 AppBarExamples::~AppBarExamples()