Wizards: introduce ObjectToFieldWidgetConverter

With it as a wrapper we can register any QObject
to use widget based field mechanism from QWizard.

It also helps to avoid the necessity for inheritance
to just adjust the text property of a widget.

Can not remove the TextCheckBox, because it is used
in some old C++ wizards.

Change-Id: I85a85a834714a4b38b501c13357fa8c8bb02b5bd
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/libs/utils/wizardpage.h

@@ -31,9 +31,44 @@
 #include <QString>
 #include <QWizardPage>
 
+#include <functional>
+
 namespace Utils {
 
 class Wizard;
+namespace Internal {
+
+class QTCREATOR_UTILS_EXPORT ObjectToFieldWidgetConverter : public QWidget
+{
+    Q_OBJECT
+    Q_PROPERTY(QString text READ text NOTIFY textChanged)
+
+public:
+    template <class T, typename... Arguments>
+    static ObjectToFieldWidgetConverter *create(T *sender, void (T::*member)(Arguments...), const std::function<QString()> &toTextFunction)
+    {
+        auto widget = new ObjectToFieldWidgetConverter();
+        widget->toTextFunction = toTextFunction;
+        connect(sender, &QObject::destroyed, widget, &QObject::deleteLater);
+        connect(sender, member, widget, [widget] () {
+            emit widget->textChanged(widget->text());
+        });
+        return widget;
+    }
+
+signals:
+    void textChanged(const QString&);
+
+private:
+    ObjectToFieldWidgetConverter () = default;
+
+    // is used by the property text
+    QString text() {return toTextFunction();}
+    std::function<QString()> toTextFunction;
+};
+
+} // Internal
+
 class QTCREATOR_UTILS_EXPORT WizardPage : public QWizardPage
 {
     Q_OBJECT
@@ -43,6 +78,13 @@ public:
 
     virtual void pageWasAdded(); // called when this page was added to a Utils::Wizard
 
+    template<class T, typename... Arguments>
+    void registerObjectAsFieldWithName(const QString &name, T *sender, void (T::*changeSignal)(Arguments...),
+        const std::function<QString()> &senderToString)
+    {
+        registerFieldWithName(name, Internal::ObjectToFieldWidgetConverter::create(sender, changeSignal, senderToString), "text", SIGNAL(textChanged(QString)));
+    }
+
     void registerFieldWithName(const QString &name, QWidget *widget,
                                const char *property = 0, const char *changedSignal = 0);
 

src/plugins/projectexplorer/jsonwizard/jsonfieldpage.cpp

@@ -33,7 +33,6 @@
 #include <utils/fancylineedit.h>
 #include <utils/qtcassert.h>
 #include <utils/stringutils.h>
-#include <utils/textfieldcheckbox.h>
 #include <utils/textfieldcombobox.h>
 #include <utils/theme/theme.h>
 
@@ -702,16 +701,23 @@ bool CheckBoxField::parseData(const QVariant &data, QString *errorMessage)
 QWidget *CheckBoxField::createWidget(const QString &displayName, JsonFieldPage *page)
 {
     Q_UNUSED(page);
-    return new TextFieldCheckBox(displayName);
+    return new QCheckBox(displayName);
 }
 
 void CheckBoxField::setup(JsonFieldPage *page, const QString &name)
 {
-    auto w = qobject_cast<TextFieldCheckBox *>(widget());
+    auto w = qobject_cast<QCheckBox *>(widget());
     QTC_ASSERT(w, return);
-    QObject::connect(w, &TextFieldCheckBox::clicked,
-                     page, [this, page]() { m_isModified = true; page->completeChanged();});
-    page->registerFieldWithName(name, w, "compareText", SIGNAL(textChanged(QString)));
+    page->registerObjectAsFieldWithName<QCheckBox>(name, w, &QCheckBox::stateChanged, [this, page, w] () -> QString {
+        if (w->checkState() == Qt::Checked)
+            return page->expander()->expand(m_checkedValue);
+        return page->expander()->expand(m_uncheckedValue);
+    });
+
+    QObject::connect(w, &QCheckBox::stateChanged, page, [this, page]() {
+        m_isModified = true;
+        emit page->completeChanged();
+    });
 }
 
 bool CheckBoxField::validate(MacroExpander *expander, QString *message)
@@ -720,7 +726,7 @@ bool CheckBoxField::validate(MacroExpander *expander, QString *message)
         return false;
 
     if (!m_isModified) {
-        auto w = qobject_cast<TextFieldCheckBox *>(widget());
+        auto w = qobject_cast<QCheckBox *>(widget());
         QTC_ASSERT(w, return false);
         w->setChecked(JsonWizard::boolFromVariant(m_checkedExpression, expander));
     }
@@ -729,10 +735,8 @@ bool CheckBoxField::validate(MacroExpander *expander, QString *message)
 
 void CheckBoxField::initializeData(MacroExpander *expander)
 {
-    auto w = qobject_cast<TextFieldCheckBox *>(widget());
+    auto w = qobject_cast<QCheckBox *>(widget());
     QTC_ASSERT(widget(), return);
-    w->setTrueText(expander->expand(m_checkedValue));
-    w->setFalseText(expander->expand(m_uncheckedValue));
 
     w->setChecked(JsonWizard::boolFromVariant(m_checkedExpression, expander));
 }

src/plugins/projectexplorer/jsonwizard/jsonfieldpage.h

@@ -42,7 +42,6 @@ QT_END_NAMESPACE
 
 namespace Utils {
 class MacroExpander;
-class TextFieldCheckBox;
 class TextFieldComboBox;
 } // namespace Utils