Add a FDialog example

test/dialog.cpp

@@ -0,0 +1,70 @@
+// dialog.cpp
+
+#include "fapp.h"
+#include "fbutton.h"
+#include "fdialog.h"
+#include "flabel.h"
+
+
+//----------------------------------------------------------------------
+// callback function
+//----------------------------------------------------------------------
+void cb_quit (FWidget*, void* data_ptr)
+{
+  FApplication* app = static_cast<FApplication*>(data_ptr);
+  app->quit();
+}
+
+//----------------------------------------------------------------------
+//                               main part
+//----------------------------------------------------------------------
+int main (int argc, char* argv[])
+{
+  // Create the application object
+  FApplication app(argc, argv);
+
+  // Create a simple dialog box
+  FDialog dgl(&app);
+  dgl.setText ("FDialog");
+  dgl.setGeometry (4, 3, 41, 11);
+  dgl.setShadow();
+
+  // Create text labels
+  FLabel label_1(&dgl),
+         label_2(&dgl),
+         label_3(&dgl),
+         label_4(&dgl),
+         label_5(&dgl);
+
+  label_1.setText (wchar_t(fc::BlackUpPointingTriangle));
+  label_2.setText (wchar_t(fc::BoxDrawingsUpAndRight)
+                  + FString(2, wchar_t(fc::BoxDrawingsHorizontal))
+                  + FString(" Double click the title bar button,") );
+  label_3.setText ("press Q on the keyboard,");
+  label_4.setText ("or push the button below to exit");
+  label_5.setText ("the program.");
+
+  label_1.setGeometry (1, 1, 1, 1);
+  label_2.setGeometry (1, 2, 38, 1);
+  label_3.setGeometry (5, 3, 24, 1);
+  label_4.setGeometry (5, 4, 32, 1);
+  label_5.setGeometry (5, 5, 12, 1);
+
+  // Create the quit button
+  FButton btn("&Quit", &dgl);
+  btn.setGeometry (16, 7, 9, 1);
+  btn.setShadow();
+  btn.setFocus();
+
+  // Connect the button signal "clicked" with the callback function
+  btn.addCallback
+  (
+    "clicked",
+    reinterpret_cast<FWidget::FCallback>(&cb_quit),
+    &app
+  );
+
+  app.setMainWidget(&dgl);
+  dgl.show();
+  return app.exec();
+}