[welcome] Restructure requirements checking

- Move widget behavior into its own container / widget class
 - Change the RequirementsChecker class to just check the
   requirements, returning a results list
 - Connect from the module manager to the results widget.

src/modules/welcome/CMakeLists.txt

@@ -6,8 +6,9 @@ find_package( Qt5 ${QT_VERSION} CONFIG REQUIRED DBus Network )
 include_directories( ${PROJECT_BINARY_DIR}/src/libcalamaresui )
 
 set( CHECKER_SOURCES
-    checker/CheckItemWidget.cpp
+    checker/CheckerContainer.cpp
     checker/CheckerWidget.cpp
+    checker/CheckItemWidget.cpp
     checker/RequirementsChecker.cpp
     checker/partman_devices.c
 )

src/modules/welcome/WelcomePage.cpp

@@ -22,10 +22,13 @@
 
 #include "ui_WelcomePage.h"
 #include "CalamaresVersion.h"
+#include "checker/CheckerContainer.h"
 #include "checker/RequirementsChecker.h"
 #include "utils/Logger.h"
 #include "utils/CalamaresUtilsGui.h"
 #include "utils/Retranslator.h"
+
+#include "modulesystem/ModuleManager.h"
 #include "ViewManager.h"
 
 #include <QApplication>
@@ -39,11 +42,13 @@
 #include "Branding.h"
 
 
-WelcomePage::WelcomePage( RequirementsChecker* requirementsChecker, QWidget* parent )
+WelcomePage::WelcomePage( QWidget* parent )
     : QWidget( parent )
     , ui( new Ui::WelcomePage )
-    , m_requirementsChecker( requirementsChecker )
+    , m_checkingWidget( new CheckerContainer( this ) )
 {
+    connect( Calamares::ModuleManager::instance(), &Calamares::ModuleManager::requirementsResult, m_checkingWidget, &CheckerContainer::requirementsChecked );
+    connect( Calamares::ModuleManager::instance(), &Calamares::ModuleManager::requirementsComplete, m_checkingWidget, &CheckerContainer::requirementsComplete );
     ui->setupUi( this );
 
     ui->verticalLayout->insertSpacing( 1, CalamaresUtils::defaultFontHeight() * 2 );
@@ -102,7 +107,7 @@ WelcomePage::WelcomePage( RequirementsChecker* requirementsChecker, QWidget* par
         mb.exec();
     } );
 
-    ui->verticalLayout->insertWidget( 3, m_requirementsChecker->widget() );
+    ui->verticalLayout->insertWidget( 3, m_checkingWidget);
 }
 
 
@@ -257,3 +262,7 @@ WelcomePage::focusInEvent( QFocusEvent* e )
     e->accept();
 }
 
+bool WelcomePage::verdict() const
+{
+    return m_checkingWidget->verdict();
+}

src/modules/welcome/WelcomePage.h

@@ -26,26 +26,27 @@ namespace Ui
 class WelcomePage;
 }
 
-class RequirementsChecker;
+class CheckerContainer;
 
 class WelcomePage : public QWidget
 {
     Q_OBJECT
 public:
-    explicit WelcomePage( RequirementsChecker* requirementsChecker,
+    explicit WelcomePage( QWidget* parent = nullptr );
-                          QWidget* parent = nullptr );
 
     void setUpLinks( bool showSupportUrl,
                      bool showKnownIssuesUrl,
                      bool showReleaseNotesUrl );
 
+    bool verdict() const;
+
 protected:
     void focusInEvent( QFocusEvent* e ) override; //choose the child widget to focus
 
 private:
     void initLanguages();
     Ui::WelcomePage* ui;
-    RequirementsChecker* m_requirementsChecker;
+    CheckerContainer* m_checkingWidget;
 };
 
 #endif // WELCOMEPAGE_H

src/modules/welcome/WelcomeViewStep.cpp

@@ -32,7 +32,7 @@ WelcomeViewStep::WelcomeViewStep( QObject* parent )
     , m_requirementsChecker( new RequirementsChecker( this ) )
 {
     emit nextStatusChanged( true );
-    m_widget = new WelcomePage( m_requirementsChecker );
+    m_widget = new WelcomePage();
 }
 
 
@@ -72,7 +72,7 @@ WelcomeViewStep::back()
 bool
 WelcomeViewStep::isNextEnabled() const
 {
-    return m_requirementsChecker->verdict();
+    return m_widget->verdict();
 }
 
 
@@ -131,4 +131,3 @@ WelcomeViewStep::setConfigurationMap( const QVariantMap& configurationMap )
         cDebug() << "WARNING: no valid requirements map found in welcome "
                     "module configuration.";
 }
-

src/modules/welcome/WelcomeViewStep.h

@@ -21,6 +21,7 @@
 
 #include <QObject>
 
+#include <modulesystem/Requirement.h>
 #include <utils/PluginFactory.h>
 #include <viewpages/ViewStep.h>
 
@@ -58,7 +59,6 @@ public:
 
 private:
     WelcomePage* m_widget;
-
     RequirementsChecker* m_requirementsChecker;
 };
 

src/modules/welcome/checker/CheckerContainer.cpp

@@ -0,0 +1,72 @@
+/* === This file is part of Calamares - <https://github.com/calamares> ===
+ *
+ *   Copyright 2014-2017, Teo Mrnjavac <teo@kde.org>
+ *   Copyright 2017, Adriaan de Groot <groot@kde.org>
+ *   Copyright 2017, Gabriel Craciunescu <crazy@frugalware.org>
+ *
+ *   Calamares is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Calamares is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with Calamares. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Based on code extracted from RequirementsChecker.cpp */
+
+#include "CheckerContainer.h"
+
+#include "CheckerWidget.h"
+
+#include "utils/CalamaresUtilsGui.h"
+#include "utils/Logger.h"
+#include "utils/Retranslator.h"
+#include "widgets/WaitingWidget.h"
+
+CheckerContainer::CheckerContainer(QWidget* parent)
+    : QWidget( parent )
+    , m_waitingWidget( new WaitingWidget( QString() ) )
+    , m_checkerWidget( new CheckerWidget() )
+    , m_verdict( false )
+{
+    QBoxLayout* mainLayout = new QHBoxLayout;
+    setLayout( mainLayout );
+    CalamaresUtils::unmarginLayout( mainLayout );
+
+    mainLayout->addWidget( m_waitingWidget );
+    CALAMARES_RETRANSLATE( m_waitingWidget->setText( tr( "Gathering system information..." ) ); )
+}
+
+CheckerContainer::~CheckerContainer()
+{
+    delete m_waitingWidget;
+    delete m_checkerWidget;
+}
+
+void CheckerContainer::requirementsComplete( bool ok )
+{
+    m_checkerWidget->init( m_requirements );
+    layout()->removeWidget( m_waitingWidget );
+    m_waitingWidget->deleteLater();
+    m_waitingWidget = nullptr;  // Don't delete in constructor
+    m_checkerWidget->setParent( this );
+    layout()->addWidget( m_checkerWidget );
+
+    m_verdict = ok;
+}
+
+void CheckerContainer::requirementsChecked(const Calamares::RequirementsList& l)
+{
+    m_requirements.append( l );
+}
+
+bool CheckerContainer::verdict() const
+{
+    return m_verdict;
+}

src/modules/welcome/checker/CheckerContainer.h

@@ -0,0 +1,62 @@
+/* === This file is part of Calamares - <https://github.com/calamares> ===
+ *
+ *   Copyright 2014-2017, Teo Mrnjavac <teo@kde.org>
+ *   Copyright 2017, Adriaan de Groot <groot@kde.org>
+ *   Copyright 2017, Gabriel Craciunescu <crazy@frugalware.org>
+ *
+ *   Calamares is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Calamares is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with Calamares. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Based on code extracted from RequirementsChecker.cpp */
+
+#ifndef CHECKERCONTAINER_H
+#define CHECKERCONTAINER_H
+
+#include <QWidget>
+
+#include "modulesystem/Requirement.h"
+
+class CheckerWidget;
+class WaitingWidget;
+
+/**
+ * A widget that collects requirements results; until the results are
+ * all in, displays a spinner / waiting widget. Then it switches to
+ * a (list) diplay of the results, plus some explanation of the
+ * overall state of the entire list of results.
+ */
+class CheckerContainer : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit CheckerContainer( QWidget* parent = nullptr );
+    virtual ~CheckerContainer();
+
+    bool verdict() const;
+
+public slots:
+    void requirementsChecked( const Calamares::RequirementsList& );
+
+    /** @brief All the requirements are complete, switch to list view */
+    void requirementsComplete( bool );
+
+protected:
+    WaitingWidget *m_waitingWidget;
+    CheckerWidget *m_checkerWidget;
+
+    Calamares::RequirementsList m_requirements;
+    bool m_verdict;
+} ;
+
+#endif

src/modules/welcome/checker/RequirementsChecker.cpp

@@ -20,7 +20,7 @@
 
 #include "RequirementsChecker.h"
 
-#include "CheckerWidget.h"
+#include "CheckerContainer.h"
 #include "partman_devices.h"
 
 #include "modulesystem/Requirement.h"
@@ -55,27 +55,15 @@
 
 RequirementsChecker::RequirementsChecker( QObject* parent )
     : QObject( parent )
-    , m_widget( new QWidget() )
     , m_requiredStorageGB( -1 )
     , m_requiredRamGB( -1 )
-    , m_actualWidget( new CheckerWidget() )
-    , m_verdict( false )
 {
-    QBoxLayout* mainLayout = new QHBoxLayout;
+}
-    m_widget->setLayout( mainLayout );
-    CalamaresUtils::unmarginLayout( mainLayout );
 
-    WaitingWidget* waitingWidget = new WaitingWidget( QString() );
+Calamares::RequirementsList RequirementsChecker::checkRequirements(QWidget* some_widget)
-    mainLayout->addWidget( waitingWidget );
-    CALAMARES_RETRANSLATE( waitingWidget->setText( tr( "Gathering system information..." ) ); )
-
-    QSize availableSize = qApp->desktop()->availableGeometry( m_widget ).size();
-
-    QTimer* timer = new QTimer;
-    timer->setSingleShot( true );
-    connect( timer, &QTimer::timeout,
-             [=]()
 {
+    QSize availableSize = qApp->desktop()->availableGeometry( some_widget ).size();
+
     bool enoughStorage = false;
     bool enoughRam = false;
     bool hasPower = false;
@@ -165,47 +153,7 @@ RequirementsChecker::RequirementsChecker( QObject* parent )
                 false
             } );
     }
-
+    return checkEntries;
-        m_actualWidget->init( checkEntries );
-        m_widget->layout()->removeWidget( waitingWidget );
-        waitingWidget->deleteLater();
-        m_actualWidget->setParent( m_widget );
-        m_widget->layout()->addWidget( m_actualWidget );
-
-        bool canGoNext = true;
-        foreach ( const auto& entry, checkEntries )
-        {
-            if ( !entry.checked && entry.required )
-            {
-                canGoNext = false;
-                break;
-            }
-        }
-        m_verdict = canGoNext;
-        emit verdictChanged( m_verdict );
-
-        if ( canGoNext )
-            detectFirmwareType();
-
-        timer->deleteLater();
-    } );
-    timer->start( 0 );
-
-    emit verdictChanged( true );
-}
-
-
-RequirementsChecker::~RequirementsChecker()
-{
-    if ( m_widget && m_widget->parent() == nullptr )
-        m_widget->deleteLater();
-}
-
-
-QWidget*
-RequirementsChecker::widget() const
-{
-    return m_widget;
 }
 
 
@@ -300,13 +248,6 @@ RequirementsChecker::setConfigurationMap( const QVariantMap& configurationMap )
 }
 
 
-bool
-RequirementsChecker::verdict() const
-{
-    return m_verdict;
-}
-
-
 bool
 RequirementsChecker::checkEnoughStorage( qint64 requiredSpace )
 {

src/modules/welcome/checker/RequirementsChecker.h

@@ -23,24 +23,17 @@
 #include <QObject>
 #include <QStringList>
 
-class CheckerWidget;
+#include "modulesystem/Requirement.h"
-class QWidget;
 
 class RequirementsChecker : public QObject
 {
     Q_OBJECT
 public:
     explicit RequirementsChecker( QObject* parent = nullptr );
-    virtual ~RequirementsChecker();
-
-    QWidget* widget() const;
 
     void setConfigurationMap( const QVariantMap& configurationMap );
 
-    bool verdict() const;
+    Calamares::RequirementsList checkRequirements( QWidget* some_widget );
-
-signals:
-    void verdictChanged( bool );
 
 private:
     QStringList m_entriesToCheck;
@@ -54,13 +47,9 @@ private:
     bool checkIsRoot();
     void detectFirmwareType();
 
-    QWidget* m_widget;
     qreal m_requiredStorageGB;
     qreal m_requiredRamGB;
     QString m_checkHasInternetUrl;
-
-    CheckerWidget* m_actualWidget;
-    bool m_verdict;
 };
 
 #endif // REQUIREMENTSCHECKER_H