[welcome] Add a filtered model for unsatisfied requirements

src/modules/welcome/Config.cpp

@@ -32,6 +32,7 @@
 Config::Config( QObject* parent )
     : QObject( parent )
     , m_languages( CalamaresUtils::Locale::availableTranslations() )
+    , m_filtermodel( std::make_unique< QSortFilterProxyModel >() )
 {
     initLanguages();
 
@@ -97,6 +98,18 @@ Config::requirementsModel() const
     return Calamares::ModuleManager::instance()->requirementsModel();
 }
 
+QAbstractItemModel*
+Config::unsatisfiedRequirements() const
+{
+    if ( !m_filtermodel->sourceModel() )
+    {
+        m_filtermodel->setFilterRole( Calamares::RequirementsModel::Roles::Satisfied );
+        m_filtermodel->setFilterFixedString( QStringLiteral( "false" ) );
+        m_filtermodel->setSourceModel( requirementsModel() );
+    }
+    return m_filtermodel.get();
+}
+
 
 QString
 Config::languageIcon() const

src/modules/welcome/Config.h

@@ -23,8 +23,11 @@
 #include "modulesystem/RequirementsModel.h"
 
 #include <QObject>
+#include <QSortFilterProxyModel>
 #include <QUrl>
 
+#include <memory>
+
 class Config : public QObject
 {
     Q_OBJECT
@@ -43,6 +46,14 @@ class Config : public QObject
      * satisfied. See the model documentation for details.
      */
     Q_PROPERTY( Calamares::RequirementsModel* requirementsModel READ requirementsModel CONSTANT FINAL )
+    /** @brief The requirements (from modules) that are **unsatisfied**
+     *
+     * This is the same as requirementsModel(), except filtered so
+     * that only those requirements that are not satisfied are exposed.
+     * Note that the type is different, so you should still use the
+     * requirementsModel() for overall status like *satisfiedMandatory*.
+     */
+    Q_PROPERTY( QAbstractItemModel* unsatisfiedRequirements READ unsatisfiedRequirements CONSTANT FINAL )
 
     Q_PROPERTY( QString languageIcon READ languageIcon CONSTANT FINAL )
 
@@ -96,6 +107,8 @@ public slots:
     ///@brief The **global** requirements model, from ModuleManager
     Calamares::RequirementsModel* requirementsModel() const;
 
+    QAbstractItemModel* unsatisfiedRequirements() const;
+
 signals:
     void countryCodeChanged( QString countryCode );
     void localeIndexChanged( int localeIndex );
@@ -112,7 +125,8 @@ signals:
 private:
     void initLanguages();
 
-    CalamaresUtils::Locale::LabelModel* m_languages;
+    CalamaresUtils::Locale::LabelModel* m_languages = nullptr;
+    std::unique_ptr< QSortFilterProxyModel > m_filtermodel;
 
     QString m_languageIcon;
     QString m_countryCode;