Polish the settingseditor example

The example is meant to show an item delegate with a line edit with
QRegularExpression-based validation depending on type.
Unfortunately, this does not work since QSettings mostly
return QString types.

Fix it to a partially working state by
- Making the expressions match from beginning to end which
  was overlooked in the QRegExp->QRegularExpression change.
- Use QCheckBox, QSpinBox for bool/int since it is silly
  to have a user edit a bool value by typing 'true'/'false'.
- Move the expressions out to a separate struct to be
  able to do some guessing of the type when reading
  the QSettings, implement for bool and int.
- Use a fancy Unicode checkmark for displaying bools.
- Fix the garbled display of QByteArray with binary data
  by displaying them with hex characters and setting them
  read-only.

Change-Id: Iba22dfafc3b813b3fd3d2915ef5210d661049382
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

1 files changed, 13 insertions, 2 deletions

diff --git a/examples/widgets/tools/settingseditor/settingstree.cpp b/examples/widgets/tools/settingseditor/settingstree.cpp
index 9132368e4a..04af8ce3b9 100644
--- a/examples/widgets/tools/settingseditor/settingstree.cpp
+++ b/examples/widgets/tools/settingseditor/settingstree.cpp
@@ -57,9 +57,10 @@
 #include <QSettings>
 
 SettingsTree::SettingsTree(QWidget *parent)
-    : QTreeWidget(parent)
+    : QTreeWidget(parent),
+      m_typeChecker(new TypeChecker)
 {
-    setItemDelegate(new VariantDelegate(this));
+    setItemDelegate(new VariantDelegate(m_typeChecker, this));
 
     setHeaderLabels({tr("Setting"), tr("Type"), tr("Value")});
     header()->setSectionResizeMode(0, QHeaderView::ResizeToContents);
@@ -77,6 +78,8 @@ SettingsTree::SettingsTree(QWidget *parent)
     connect(&refreshTimer, &QTimer::timeout, this, &SettingsTree::maybeRefresh);
 }
 
+SettingsTree::~SettingsTree() = default;
+
 void SettingsTree::setSettingsObject(const SettingsPtr &newSettings)
 {
     settings = newSettings;
@@ -211,6 +214,14 @@ void SettingsTree::updateChildItems(QTreeWidgetItem *parent)
         if (value.userType() == QMetaType::UnknownType) {
             child->setText(1, "Invalid");
         } else {
+            if (value.type() == QVariant::String) {
+                const QString stringValue = value.toString();
+                if (m_typeChecker->boolExp.match(stringValue).hasMatch()) {
+                    value.setValue(stringValue.compare("true", Qt::CaseInsensitive) == 0);
+                } else if (m_typeChecker->signedIntegerExp.match(stringValue).hasMatch())
+                    value.setValue(stringValue.toInt());
+            }
+
             child->setText(1, value.typeName());
         }
         child->setText(2, VariantDelegate::displayText(value));