JsonWizard: Allow for custom widgets in the Field page

... instead of having a hard-coded list of widgets you can use.

Change-Id: Iedf7016412ce9d619fea5cdffe6dbf86beda92b0
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Benjamin Zeller <benjamin.zeller@canonical.com>

src/plugins/projectexplorer/jsonwizard/jsonfieldpage.cpp

@@ -73,25 +73,6 @@ namespace ProjectExplorer {
 // Helper:
 // --------------------------------------------------------------------
 
-static JsonFieldPage::Field *createFieldData(const QString &type)
-{
-    if (type == QLatin1String("Label"))
-        return new LabelField;
-    else if (type == QLatin1String("Spacer"))
-        return new SpacerField;
-    else if (type == QLatin1String("LineEdit"))
-        return new LineEditField;
-    else if (type == QLatin1String("TextEdit"))
-        return new TextEditField;
-    else if (type == QLatin1String("PathChooser"))
-        return new PathChooserField;
-    else if (type == QLatin1String("CheckBox"))
-        return new CheckBoxField;
-    else if (type == QLatin1String("ComboBox"))
-        return new ComboBoxField;
-    return 0;
-}
-
 class LineEditValidator : public QRegularExpressionValidator
 {
 public:
@@ -909,6 +890,8 @@ void ComboBoxField::initializeData(MacroExpander *expander)
 // JsonFieldPage:
 // --------------------------------------------------------------------
 
+QHash<QString, JsonFieldPage::FieldFactory> JsonFieldPage::m_factories;
+
 JsonFieldPage::JsonFieldPage(MacroExpander *expander, QWidget *parent) :
     WizardPage(parent),
     m_formLayout(new QFormLayout),
@@ -935,6 +918,12 @@ JsonFieldPage::~JsonFieldPage()
     qDeleteAll(m_fields);
 }
 
+void JsonFieldPage::registerFieldFactory(const QString &id, const JsonFieldPage::FieldFactory &ff)
+{
+    QTC_ASSERT(!m_factories.contains(id), return);
+    m_factories.insert(id, ff);
+}
+
 bool JsonFieldPage::setup(const QVariant &data)
 {
     QString errorMessage;
@@ -1002,4 +991,11 @@ MacroExpander *JsonFieldPage::expander()
     return m_expander;
 }
 
+JsonFieldPage::Field *JsonFieldPage::createFieldData(const QString &type)
+{
+    if (!m_factories.contains(type))
+        return 0;
+    return m_factories.value(type)();
+}
+
 } // namespace ProjectExplorer

src/plugins/projectexplorer/jsonwizard/jsonfieldpage.h

@@ -115,6 +115,9 @@ public:
     JsonFieldPage(Utils::MacroExpander *expander, QWidget *parent = 0);
     ~JsonFieldPage();
 
+    typedef std::function<Field *()> FieldFactory;
+    static void registerFieldFactory(const QString &id, const FieldFactory &ff);
+
     bool setup(const QVariant &data);
 
     bool isComplete() const;
@@ -129,6 +132,10 @@ public:
     Utils::MacroExpander *expander();
 
 private:
+    static QHash<QString, FieldFactory> m_factories;
+
+    static Field *createFieldData(const QString &type);
+
     QFormLayout *m_formLayout;
     QLabel *m_errorLabel;
 

src/plugins/projectexplorer/jsonwizard/jsonwizardpagefactory_p.cpp

@@ -31,6 +31,7 @@
 #include "jsonwizardpagefactory_p.h"
 
 #include "jsonfieldpage.h"
+#include "jsonfieldpage_p.h"
 #include "jsonfilepage.h"
 #include "jsonkitspage.h"
 #include "jsonprojectpage.h"
@@ -53,6 +54,14 @@ namespace Internal {
 FieldPageFactory::FieldPageFactory()
 {
     setTypeIdsSuffix(QLatin1String("Fields"));
+
+    JsonFieldPage::registerFieldFactory(QLatin1String("Label"), []() { return new LabelField; });
+    JsonFieldPage::registerFieldFactory(QLatin1String("Spacer"), []() { return new SpacerField; });
+    JsonFieldPage::registerFieldFactory(QLatin1String("LineEdit"), []() { return new LineEditField; });
+    JsonFieldPage::registerFieldFactory(QLatin1String("TextEdit"), []() { return new TextEditField; });
+    JsonFieldPage::registerFieldFactory(QLatin1String("PathChooser"), []() { return new PathChooserField; });
+    JsonFieldPage::registerFieldFactory(QLatin1String("CheckBox"), []() { return new CheckBoxField; });
+    JsonFieldPage::registerFieldFactory(QLatin1String("ComboBox"), []() { return new ComboBoxField; });
 }
 
 Utils::WizardPage *FieldPageFactory::create(JsonWizard *wizard, Core::Id typeId, const QVariant &data)