examples: minor code revamping in recipesv5.10.0-beta3v5.10.0-beta2v5.10.0-beta1

Task-number: QTBUG-60660
Change-Id: I396f64c770f4ccbf5b2bbd6240ccb4618df70b23
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

3 files changed, 11 insertions, 10 deletions

diff --git a/examples/xmlpatterns/recipes/querymainwindow.cpp b/examples/xmlpatterns/recipes/querymainwindow.cpp
index 9a543d5..f24185b 100644
--- a/examples/xmlpatterns/recipes/querymainwindow.cpp
+++ b/examples/xmlpatterns/recipes/querymainwindow.cpp
@@ -38,15 +38,15 @@
 **
 ****************************************************************************/
 
-#include <QMessageBox>
-#include <QFileDialog>
+#include <QtWidgets/QMessageBox>
+#include <QtWidgets/QFileDialog>
 #include <QtXmlPatterns>
 
 #include "querymainwindow.h"
 #include "xmlsyntaxhighlighter.h"
 
 //! [0]
-QueryMainWindow::QueryMainWindow() : ui_defaultQueries(0)
+QueryMainWindow::QueryMainWindow()
 {
     setupUi(this);
 
@@ -55,14 +55,15 @@ QueryMainWindow::QueryMainWindow() : ui_defaultQueries(0)
 
     ui_defaultQueries = findChild<QComboBox*>("defaultQueries");
     QMetaObject::connectSlotsByName(this);
-    connect(ui_defaultQueries, SIGNAL(currentIndexChanged(int)), SLOT(displayQuery(int)));
+
+    connect(ui_defaultQueries, QOverload<int>::of(&QComboBox::currentIndexChanged),
+            this, &QueryMainWindow::displayQuery);
 
     loadInputFile();
     const QStringList queries(QDir(":/files/", "*.xq").entryList());
-    int len = queries.count();
-    for(int i = 0; i < len; ++i)
-        ui_defaultQueries->addItem(queries.at(i));
-    if (len > 0)
+    for (const auto &query : queries)
+        ui_defaultQueries->addItem(query);
+    if (queries.count() > 0)
         displayQuery(0);
 }
 //! [0]
diff --git a/examples/xmlpatterns/recipes/querymainwindow.h b/examples/xmlpatterns/recipes/querymainwindow.h
index 25ffaab..7961d88 100644
--- a/examples/xmlpatterns/recipes/querymainwindow.h
+++ b/examples/xmlpatterns/recipes/querymainwindow.h
@@ -62,7 +62,7 @@ public slots:
     void displayQuery(int index);
 
 private:
-    QComboBox* ui_defaultQueries;
+    QComboBox *ui_defaultQueries = nullptr;
 
     void evaluate(const QString &str);
     void loadInputFile();
diff --git a/examples/xmlpatterns/shared/xmlsyntaxhighlighter.h b/examples/xmlpatterns/shared/xmlsyntaxhighlighter.h
index 7a104d5..bdd379c 100644
--- a/examples/xmlpatterns/shared/xmlsyntaxhighlighter.h
+++ b/examples/xmlpatterns/shared/xmlsyntaxhighlighter.h
@@ -47,7 +47,7 @@
 class XmlSyntaxHighlighter : public QSyntaxHighlighter
 {
     public:
-        XmlSyntaxHighlighter(QTextDocument *parent = 0);
+        explicit XmlSyntaxHighlighter(QTextDocument *parent = nullptr);
 
     protected:
         virtual void highlightBlock(const QString &text);