Add find support to the help side panel.

Task:     248199

src/plugins/help/helpfindsupport.cpp

@@ -78,3 +78,67 @@ bool HelpFindSupport::findStep(const QString &txt, QTextDocument::FindFlags find
     QTC_ASSERT(m_centralWidget, return false);
     return m_centralWidget->find(txt, findFlags, false);
 }
+
+HelpViewerFindSupport::HelpViewerFindSupport(HelpViewer *viewer)
+        : m_viewer(viewer)
+{
+}
+
+QString HelpViewerFindSupport::currentFindString() const
+{
+    QTC_ASSERT(m_viewer, return QString());
+    return m_viewer->selectedText();
+}
+
+bool HelpViewerFindSupport::findIncremental(const QString &txt, QTextDocument::FindFlags findFlags)
+{
+    QTC_ASSERT(m_viewer, return false);
+    findFlags &= ~QTextDocument::FindBackward;
+    return find(txt, findFlags, true);
+}
+
+bool HelpViewerFindSupport::findStep(const QString &txt, QTextDocument::FindFlags findFlags)
+{
+    QTC_ASSERT(m_viewer, return false);
+    return find(txt, findFlags, false);
+}
+
+bool HelpViewerFindSupport::find(const QString &txt, QTextDocument::FindFlags findFlags, bool incremental)
+{
+    QTC_ASSERT(m_viewer, return false);
+#if !defined(QT_NO_WEBKIT)
+    Q_UNUSED(incremental);
+    QWebPage::FindFlags options = QWebPage::FindWrapsAroundDocument;
+    if (findFlags & QTextDocument::FindBackward)
+        options |= QWebPage::FindBackward;
+    if (findFlags & QTextDocument::FindCaseSensitively)
+        options |= QWebPage::FindCaseSensitively;
+
+    return m_viewer->findText(txt, options);
+#else
+    QTextCursor cursor = viewer->textCursor();
+    QTextDocument *doc = viewer->document();
+    QTextBrowser *browser = qobject_cast<QTextBrowser*>(viewer);
+
+    if (!browser || !doc || cursor.isNull())
+        return false;
+    if (incremental)
+        cursor.setPosition(cursor.selectionStart());
+
+    QTextCursor found = doc->find(txt, cursor, findFlags);
+    if (found.isNull()) {
+        if ((findFlags&QTextDocument::FindBackward) == 0)
+            cursor.movePosition(QTextCursor::Start);
+        else
+            cursor.movePosition(QTextCursor::End);
+        found = doc->find(txt, cursor, findFlags);
+        if (found.isNull()) {
+            return false;
+        }
+    }
+    if (!found.isNull()) {
+        viewer->setTextCursor(found);
+    }
+    return true;
+#endif
+}

src/plugins/help/helpfindsupport.h

@@ -34,6 +34,10 @@
 
 #include <find/ifindsupport.h>
 
+QT_BEGIN_NAMESPACE
+class HelpViewer;
+QT_END_NAMESPACE
+
 namespace Help {
 namespace Internal {
 
@@ -65,6 +69,31 @@ private:
     CentralWidget *m_centralWidget;
 };
 
+class HelpViewerFindSupport : public Find::IFindSupport
+{
+    Q_OBJECT
+public:
+    HelpViewerFindSupport(HelpViewer *viewer);
+
+    bool isEnabled() const { return true; }
+    bool supportsReplace() const { return false; }
+    void resetIncrementalSearch() {}
+    void clearResults() {}
+    QString currentFindString() const;
+    QString completedFindString() const { return QString(); }
+
+    bool findIncremental(const QString &txt, QTextDocument::FindFlags findFlags);
+    bool findStep(const QString &txt, QTextDocument::FindFlags findFlags);
+    bool replaceStep(const QString &, const QString &,
+        QTextDocument::FindFlags ) { return false; }
+    int replaceAll(const QString &, const QString &,
+        QTextDocument::FindFlags ) { return 0; }
+
+private:
+    bool find(const QString &ttf, QTextDocument::FindFlags findFlags, bool incremental);
+    HelpViewer *m_viewer;
+};
+
 } // namespace Internal
 } // namespace Help
 

src/plugins/help/helpplugin.cpp

@@ -373,6 +373,9 @@ void HelpPlugin::createRightPaneSideBar()
     rightPaneLayout->addWidget(rightPaneToolBar);
 
     m_helpViewerForSideBar = new HelpViewer(m_helpEngine, 0);
+    Aggregation::Aggregate *agg = new Aggregation::Aggregate();
+    agg->add(m_helpViewerForSideBar);
+    agg->add(new HelpViewerFindSupport(m_helpViewerForSideBar));
     rightPaneLayout->addWidget(m_helpViewerForSideBar);
     m_core->addContextObject(new Core::BaseContext(m_helpViewerForSideBar, QList<int>()
         << m_core->uniqueIDManager()->uniqueIdentifier(Constants::C_HELP_SIDEBAR),