Help: Get rid of special CentralWidget class for help mode viewer

Change-Id: Id733eb0449cdaed5901e4144089c8adaaf07d7a9
Reviewed-by: hjk <hjk@qt.io>

18 files changed, 74 insertions, 158 deletions

diff --git a/src/plugins/help/CMakeLists.txt b/src/plugins/help/CMakeLists.txt
index 73122b15dc..ac70c823e2 100644
--- a/src/plugins/help/CMakeLists.txt
+++ b/src/plugins/help/CMakeLists.txt
@@ -4,7 +4,6 @@ add_qtc_plugin(Help
   PLUGIN_DEPENDS Core ProjectExplorer
   PLUGIN_RECOMMENDS TextEditor
   SOURCES
-    centralwidget.cpp centralwidget.h
     docsettingspage.cpp docsettingspage.h docsettingspage.ui
     filtersettingspage.cpp filtersettingspage.h filtersettingspage.ui
     generalsettingspage.cpp generalsettingspage.h generalsettingspage.ui
diff --git a/src/plugins/help/centralwidget.cpp b/src/plugins/help/centralwidget.cpp
deleted file mode 100644
index 26e65d16e5..0000000000
--- a/src/plugins/help/centralwidget.cpp
+++ /dev/null
@@ -1,69 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of Qt Creator.
-**
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 3 as published by the Free Software
-** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-3.0.html.
-**
-****************************************************************************/
-
-#include "centralwidget.h"
-
-#include "helpviewer.h"
-#include "localhelpmanager.h"
-
-#include <utils/qtcassert.h>
-
-using namespace Help::Internal;
-
-static CentralWidget *gStaticCentralWidget = nullptr;
-
-// -- CentralWidget
-
-CentralWidget::CentralWidget(const Core::Context &context, QWidget *parent)
-    : HelpWidget(context, HelpWidget::ModeWidget, parent)
-{
-    QTC_CHECK(!gStaticCentralWidget);
-    gStaticCentralWidget = this;
-}
-
-CentralWidget::~CentralWidget()
-{
-    // TODO: this shouldn't be done here
-    QList<qreal> zoomFactors;
-    QStringList currentPages;
-    for (int i = 0; i < viewerCount(); ++i) {
-        const HelpViewer * const viewer = viewerAt(i);
-        const QUrl &source = viewer->source();
-        if (source.isValid()) {
-            currentPages.append(source.toString());
-            zoomFactors.append(viewer->scale());
-        }
-    }
-
-    LocalHelpManager::setLastShownPages(currentPages);
-    LocalHelpManager::setLastShownPagesZoom(zoomFactors);
-    LocalHelpManager::setLastSelectedTab(currentIndex());
-}
-
-CentralWidget *CentralWidget::instance()
-{
-    Q_ASSERT(gStaticCentralWidget);
-    return gStaticCentralWidget;
-}
diff --git a/src/plugins/help/centralwidget.h b/src/plugins/help/centralwidget.h
deleted file mode 100644
index b6fc9d4e89..0000000000
--- a/src/plugins/help/centralwidget.h
+++ /dev/null
@@ -1,47 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of Qt Creator.
-**
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 3 as published by the Free Software
-** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-3.0.html.
-**
-****************************************************************************/
-
-#pragma once
-
-#include "helpwidget.h"
-
-#include <coreplugin/find/ifindsupport.h>
-
-namespace Help {
-namespace Internal {
-
-class CentralWidget : public HelpWidget
-{
-    Q_OBJECT
-
-public:
-    CentralWidget(const Core::Context &context, QWidget *parent = nullptr);
-    ~CentralWidget() override;
-
-    static CentralWidget *instance();
-};
-
-} // namespace Internal
-} // namespace Help
diff --git a/src/plugins/help/generalsettingspage.cpp b/src/plugins/help/generalsettingspage.cpp
index 93538efc09..4bebdfc9a9 100644
--- a/src/plugins/help/generalsettingspage.cpp
+++ b/src/plugins/help/generalsettingspage.cpp
@@ -25,9 +25,10 @@
 
 #include "generalsettingspage.h"
 
-#include "centralwidget.h"
 #include "helpconstants.h"
+#include "helpplugin.h"
 #include "helpviewer.h"
+#include "helpwidget.h"
 #include "localhelpmanager.h"
 #include "xbelsupport.h"
 
@@ -105,10 +106,12 @@ QWidget *GeneralSettingsPage::widget()
                 this, &GeneralSettingsPage::setCurrentPage);
         connect(m_ui->blankPageButton, &QPushButton::clicked,
                 this, &GeneralSettingsPage::setBlankPage);
-        connect(m_ui->defaultPageButton, &QPushButton::clicked,
-                this, &GeneralSettingsPage::setDefaultPage);
+        connect(m_ui->defaultPageButton,
+                &QPushButton::clicked,
+                this,
+                &GeneralSettingsPage::setDefaultPage);
 
-        HelpViewer *viewer = CentralWidget::instance()->currentViewer();
+        HelpViewer *viewer = HelpPlugin::modeHelpWidget()->currentViewer();
         if (!viewer)
             m_ui->currentPageButton->setEnabled(false);
 
@@ -191,7 +194,7 @@ void GeneralSettingsPage::apply()
 
 void GeneralSettingsPage::setCurrentPage()
 {
-    HelpViewer *viewer = CentralWidget::instance()->currentViewer();
+    HelpViewer *viewer = HelpPlugin::modeHelpWidget()->currentViewer();
     if (viewer)
         m_ui->homePageLineEdit->setText(viewer->source().toString());
 }
diff --git a/src/plugins/help/help.pro b/src/plugins/help/help.pro
index 05f8da1552..f478611295 100644
--- a/src/plugins/help/help.pro
+++ b/src/plugins/help/help.pro
@@ -9,7 +9,6 @@ DEFINES += \
     HELP_LIBRARY
 
 HEADERS += \
-    centralwidget.h \
     docsettingspage.h \
     filtersettingspage.h \
     generalsettingspage.h \
@@ -32,7 +31,6 @@ HEADERS += \
     helpwidget.h
 
 SOURCES += \
-    centralwidget.cpp \
     docsettingspage.cpp \
     filtersettingspage.cpp \
     generalsettingspage.cpp \
diff --git a/src/plugins/help/help.qbs b/src/plugins/help/help.qbs
index 7503b442b4..d1458d8470 100644
--- a/src/plugins/help/help.qbs
+++ b/src/plugins/help/help.qbs
@@ -28,7 +28,6 @@ QtcPlugin {
     Group {
         name: "Sources"
         files: [
-            "centralwidget.cpp", "centralwidget.h",
             "docsettingspage.cpp", "docsettingspage.h", "docsettingspage.ui",
             "filtersettingspage.cpp", "filtersettingspage.h", "filtersettingspage.ui",
             "generalsettingspage.cpp", "generalsettingspage.h", "generalsettingspage.ui",
diff --git a/src/plugins/help/helpfindsupport.h b/src/plugins/help/helpfindsupport.h
index daf63fe2a5..d2ce974b33 100644
--- a/src/plugins/help/helpfindsupport.h
+++ b/src/plugins/help/helpfindsupport.h
@@ -25,8 +25,6 @@
 
 #pragma once
 
-#include "centralwidget.h"
-
 #include <coreplugin/find/ifindsupport.h>
 
 namespace Help {
diff --git a/src/plugins/help/helpindexfilter.cpp b/src/plugins/help/helpindexfilter.cpp
index 42467934b7..c58c654320 100644
--- a/src/plugins/help/helpindexfilter.cpp
+++ b/src/plugins/help/helpindexfilter.cpp
@@ -25,7 +25,6 @@
 
 #include "helpindexfilter.h"
 
-#include "centralwidget.h"
 #include "helpicons.h"
 #include "helpmanager.h"
 #include "topicchooser.h"
diff --git a/src/plugins/help/helpplugin.cpp b/src/plugins/help/helpplugin.cpp
index cc1357ca4b..fdbe8a154f 100644
--- a/src/plugins/help/helpplugin.cpp
+++ b/src/plugins/help/helpplugin.cpp
@@ -26,7 +26,6 @@
 #include "helpplugin.h"
 
 #include "bookmarkmanager.h"
-#include "centralwidget.h"
 #include "docsettingspage.h"
 #include "filtersettingspage.h"
 #include "generalsettingspage.h"
@@ -37,11 +36,12 @@
 #include "helpmanager.h"
 #include "helpmode.h"
 #include "helpviewer.h"
+#include "helpwidget.h"
 #include "localhelpmanager.h"
 #include "openpagesmanager.h"
 #include "remotehelpfilter.h"
-#include "searchwidget.h"
 #include "searchtaskhandler.h"
+#include "searchwidget.h"
 #include "topicchooser.h"
 
 #include <bookmarkmanager.h>
@@ -118,7 +118,6 @@ public:
 
     void saveExternalWindowSettings();
     void showLinksInCurrentViewer(const QMap<QString, QUrl> &links, const QString &key);
-    void slotHideRightPane();
 
     void updateSideBarSource(const QUrl &newUrl);
 
@@ -144,8 +143,10 @@ public:
     void doSetupIfNeeded();
 
     HelpMode m_mode;
-    CentralWidget *m_centralWidget = nullptr;
+    HelpWidget *m_centralWidget = nullptr;
     HelpWidget *m_rightPaneSideBarWidget = nullptr;
+    QPointer<HelpWidget> m_externalWindow;
+    QRect m_externalWindowState;
 
     DocSettingsPage m_docSettingsPage;
     FilterSettingsPage m_filterSettingsPage;
@@ -155,9 +156,6 @@ public:
     bool m_setupNeeded = true;
     LocalHelpManager m_localHelpManager;
 
-    QPointer<HelpWidget> m_externalWindow;
-    QRect m_externalWindowState;
-
     HelpIndexFilter helpIndexFilter;
     RemoteHelpFilter remoteHelpFilter;
 };
@@ -209,16 +207,9 @@ HelpPluginPrivate::HelpPluginPrivate()
             QCoreApplication::installTranslator(qhelptr);
     }
 
-    m_centralWidget = new CentralWidget(Context("Help.CentralHelpWidget"));
+    m_centralWidget = createHelpWidget(Context("Help.CentralHelpWidget"), HelpWidget::ModeWidget);
     connect(m_centralWidget, &HelpWidget::sourceChanged,
             this, &HelpPluginPrivate::updateSideBarSource);
-    connect(m_centralWidget,
-            &CentralWidget::closeButtonClicked,
-            m_centralWidget->openPagesManager(),
-            &OpenPagesManager::closeCurrentPage);
-
-    connect(LocalHelpManager::instance(), &LocalHelpManager::returnOnCloseChanged,
-            m_centralWidget, &CentralWidget::updateCloseButton);
     connect(HelpManager::instance(), &HelpManager::helpRequested,
             this, &HelpPluginPrivate::showHelpUrl);
     connect(&m_searchTaskHandler, &SearchTaskHandler::search,
@@ -406,14 +397,19 @@ HelpWidget *HelpPluginPrivate::createHelpWidget(const Context &context, HelpWidg
     connect(widget, &HelpWidget::openHelpMode, this, [this](const QUrl &url) {
         showHelpUrl(url, Core::HelpManager::HelpModeAlways);
     });
-    connect(widget, &HelpWidget::closeButtonClicked, this, &HelpPluginPrivate::slotHideRightPane);
+    connect(LocalHelpManager::instance(),
+            &LocalHelpManager::returnOnCloseChanged,
+            widget,
+            &HelpWidget::updateCloseButton);
+    connect(widget, &HelpWidget::closeButtonClicked, this, [this, widget] {
+        if (widget->viewerCount() == 1 && LocalHelpManager::returnOnClose())
+            ModeManager::activateMode(Core::Constants::MODE_EDIT);
+        if (widget->widgetStyle() == HelpWidget::SideBarWidget)
+            RightPaneWidget::instance()->setShown(false);
+    });
     connect(widget, &HelpWidget::aboutToClose,
             this, &HelpPluginPrivate::saveExternalWindowSettings);
 
-    // force setup, as we might have never switched to full help mode
-    // thus the help engine might still run without collection file setup
-    LocalHelpManager::setupGuiHelpEngine();
-
     return widget;
 }
 
@@ -470,6 +466,11 @@ HelpViewer *HelpPlugin::createHelpViewer(qreal zoom)
     return viewer;
 }
 
+HelpWidget *HelpPlugin::modeHelpWidget()
+{
+    return dd->m_centralWidget;
+}
+
 void HelpPluginPrivate::showLinksInCurrentViewer(const QMap<QString, QUrl> &links, const QString &key)
 {
     if (links.size() < 1)
@@ -478,11 +479,6 @@ void HelpPluginPrivate::showLinksInCurrentViewer(const QMap<QString, QUrl> &link
     widget->showLinks(links, key);
 }
 
-void HelpPluginPrivate::slotHideRightPane()
-{
-    RightPaneWidget::instance()->setShown(false);
-}
-
 void HelpPluginPrivate::modeChanged(Core::Id mode, Core::Id old)
 {
     Q_UNUSED(old)
@@ -556,6 +552,9 @@ HelpViewer *HelpPluginPrivate::viewerForHelpViewerLocation(
         actualLocation = canShowHelpSideBySide() ? Core::HelpManager::SideBySideAlways
                                                  : Core::HelpManager::HelpModeAlways;
 
+    // force setup, as we might have never switched to full help mode
+    // thus the help engine might still run without collection file setup
+    LocalHelpManager::setupGuiHelpEngine();
     if (actualLocation == Core::HelpManager::ExternalHelpAlways)
         return externalHelpViewer();
 
diff --git a/src/plugins/help/helpplugin.h b/src/plugins/help/helpplugin.h
index dfba86fcc7..3ce8f77fb1 100644
--- a/src/plugins/help/helpplugin.h
+++ b/src/plugins/help/helpplugin.h
@@ -35,6 +35,7 @@ QT_END_NAMESPACE
 namespace Help {
 namespace Internal {
 
+class HelpWidget;
 class HelpViewer;
 
 class HelpPlugin : public ExtensionSystem::IPlugin
@@ -48,6 +49,7 @@ public:
 
     static void showHelpUrl(const QUrl &url, Core::HelpManager::HelpViewerLocation location);
     static HelpViewer *createHelpViewer(qreal zoom);
+    static HelpWidget *modeHelpWidget();
 
 private:
     bool initialize(const QStringList &arguments, QString *errorMessage) final;
diff --git a/src/plugins/help/helpwidget.cpp b/src/plugins/help/helpwidget.cpp
index 973b0fe9ad..9766b2f3b4 100644
--- a/src/plugins/help/helpwidget.cpp
+++ b/src/plugins/help/helpwidget.cpp
@@ -332,6 +332,10 @@ HelpWidget::HelpWidget(const Core::Context &context, WidgetStyle style, QWidget
                                                       : Utils::Icons::CLOSE_SPLIT_RIGHT;
         m_closeAction = new QAction(icon.icon(), QString(), toolBar);
         connect(m_closeAction, &QAction::triggered, this, &HelpWidget::closeButtonClicked);
+        connect(m_closeAction, &QAction::triggered, this, [this] {
+            if (viewerCount() > 1)
+                closeCurrentPage();
+        });
         button = new QToolButton;
         button->setDefaultAction(m_closeAction);
         layout->addWidget(button);
@@ -354,6 +358,7 @@ HelpWidget::HelpWidget(const Core::Context &context, WidgetStyle style, QWidget
 
 HelpWidget::~HelpWidget()
 {
+    saveState();
     if (m_sideBar) {
         m_sideBar->saveSettings(Core::ICore::settings(), sideBarSettingsKey());
         Core::ActionManager::unregisterAction(m_contentsAction, Constants::HELP_CONTENTS);
@@ -388,6 +393,11 @@ QAbstractItemModel *HelpWidget::model()
     return &m_model;
 }
 
+HelpWidget::WidgetStyle HelpWidget::widgetStyle() const
+{
+    return m_style;
+}
+
 void HelpWidget::addSideBar()
 {
     QMap<QString, Core::Command *> shortcutMap;
@@ -705,6 +715,32 @@ void HelpWidget::helpModeButtonClicked()
         close();
 }
 
+void HelpWidget::closeCurrentPage()
+{
+    removeViewerAt(currentIndex());
+}
+
+void HelpWidget::saveState() const
+{
+    // TODO generalize
+    if (m_style == ModeWidget) {
+        QList<qreal> zoomFactors;
+        QStringList currentPages;
+        for (int i = 0; i < viewerCount(); ++i) {
+            const HelpViewer *const viewer = viewerAt(i);
+            const QUrl &source = viewer->source();
+            if (source.isValid()) {
+                currentPages.append(source.toString());
+                zoomFactors.append(viewer->scale());
+            }
+        }
+
+        LocalHelpManager::setLastShownPages(currentPages);
+        LocalHelpManager::setLastShownPagesZoom(zoomFactors);
+        LocalHelpManager::setLastSelectedTab(currentIndex());
+    }
+}
+
 void HelpWidget::updateCloseButton()
 {
     if (m_style == ModeWidget) {
diff --git a/src/plugins/help/helpwidget.h b/src/plugins/help/helpwidget.h
index afd0688e8a..603e333876 100644
--- a/src/plugins/help/helpwidget.h
+++ b/src/plugins/help/helpwidget.h
@@ -81,6 +81,7 @@ public:
     ~HelpWidget() override;
 
     QAbstractItemModel *model();
+    WidgetStyle widgetStyle() const;
 
     HelpViewer *currentViewer() const;
     int currentIndex() const;
@@ -122,6 +123,8 @@ private:
     void updateForwardMenu();
     void updateWindowTitle();
     void helpModeButtonClicked();
+    void closeCurrentPage();
+    void saveState() const;
 
     void goHome();
     void addBookmark();
diff --git a/src/plugins/help/litehtmlhelpviewer.cpp b/src/plugins/help/litehtmlhelpviewer.cpp
index de86df33a5..dcc2673895 100644
--- a/src/plugins/help/litehtmlhelpviewer.cpp
+++ b/src/plugins/help/litehtmlhelpviewer.cpp
@@ -36,6 +36,7 @@
 #include <QScrollBar>
 #include <QTimer>
 #include <QVBoxLayout>
+#include <QWheelEvent>
 
 #include <QDebug>
 
diff --git a/src/plugins/help/litehtmlhelpviewer.h b/src/plugins/help/litehtmlhelpviewer.h
index 7161abd7ce..0e35d79ddb 100644
--- a/src/plugins/help/litehtmlhelpviewer.h
+++ b/src/plugins/help/litehtmlhelpviewer.h
@@ -25,7 +25,6 @@
 
 #pragma once
 
-#include "centralwidget.h"
 #include "helpviewer.h"
 #include "openpagesmanager.h"
 
diff --git a/src/plugins/help/openpagesswitcher.cpp b/src/plugins/help/openpagesswitcher.cpp
index 50ffad3b30..20117828a7 100644
--- a/src/plugins/help/openpagesswitcher.cpp
+++ b/src/plugins/help/openpagesswitcher.cpp
@@ -25,7 +25,6 @@
 
 #include "openpagesswitcher.h"
 
-#include "centralwidget.h"
 #include "openpageswidget.h"
 
 #include <utils/hostosinfo.h>
diff --git a/src/plugins/help/textbrowserhelpviewer.h b/src/plugins/help/textbrowserhelpviewer.h
index 52d5b7ce2b..0864431787 100644
--- a/src/plugins/help/textbrowserhelpviewer.h
+++ b/src/plugins/help/textbrowserhelpviewer.h
@@ -25,7 +25,6 @@
 
 #pragma once
 
-#include "centralwidget.h"
 #include "helpviewer.h"
 #include "openpagesmanager.h"
 
diff --git a/src/shared/help/contentwindow.cpp b/src/shared/help/contentwindow.cpp
index 16f7aaccbd..067627c03b 100644
--- a/src/shared/help/contentwindow.cpp
+++ b/src/shared/help/contentwindow.cpp
@@ -25,7 +25,6 @@
 
 #include "contentwindow.h"
 
-#include <centralwidget.h>
 #include <helpviewer.h>
 #include <localhelpmanager.h>
 #include <openpagesmanager.h>
diff --git a/src/shared/help/indexwindow.cpp b/src/shared/help/indexwindow.cpp
index 324a071ab6..f55ce3091b 100644
--- a/src/shared/help/indexwindow.cpp
+++ b/src/shared/help/indexwindow.cpp
@@ -27,7 +27,6 @@
 
 #include "topicchooser.h"
 
-#include <centralwidget.h>
 #include <helpviewer.h>
 #include <localhelpmanager.h>
 #include <openpagesmanager.h>