Help: Make it possible to create multiple index views

This unfortunately means doing the filtering by hand,
because filtering on the QHelpIndexModel would be shared
between multiple views.

Change-Id: Iae38952a92dbb1b4a9685aea6f057d96f0d0784f
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

5 files changed, 292 insertions, 70 deletions

diff --git a/src/plugins/help/centralwidget.cpp b/src/plugins/help/centralwidget.cpp
index 23e4d98292..fa052a69d8 100644
--- a/src/plugins/help/centralwidget.cpp
+++ b/src/plugins/help/centralwidget.cpp
@@ -31,6 +31,7 @@
 
 #include "helpviewer.h"
 #include "localhelpmanager.h"
+#include "openpagesmanager.h"
 #include "topicchooser.h"
 
 #include <utils/qtcassert.h>
@@ -76,10 +77,18 @@ CentralWidget *CentralWidget::instance()
     return gStaticCentralWidget;
 }
 
+void CentralWidget::open(const QUrl &url, bool newPage)
+{
+    if (newPage)
+        OpenPagesManager::instance().createPage(url);
+    else
+        setSource(url);
+}
+
 void CentralWidget::showTopicChooser(const QMap<QString, QUrl> &links,
-    const QString &keyword)
+    const QString &keyword, bool newPage)
 {
     TopicChooser tc(this, keyword, links);
     if (tc.exec() == QDialog::Accepted)
-        setSource(tc.link());
+        open(tc.link(), newPage);
 }
diff --git a/src/plugins/help/centralwidget.h b/src/plugins/help/centralwidget.h
index 37d310459e..808175a0c9 100644
--- a/src/plugins/help/centralwidget.h
+++ b/src/plugins/help/centralwidget.h
@@ -50,8 +50,11 @@ public:
 
     static CentralWidget *instance();
 
+    void open(const QUrl &url, bool newPage = false);
+
 public slots:
-    void showTopicChooser(const QMap<QString, QUrl> &links, const QString &key);
+    void showTopicChooser(const QMap<QString, QUrl> &links, const QString &key,
+                          bool newPage = false);
 
 };
 
diff --git a/src/plugins/help/helpplugin.cpp b/src/plugins/help/helpplugin.cpp
index 1a1a3e0bb1..429541278b 100644
--- a/src/plugins/help/helpplugin.cpp
+++ b/src/plugins/help/helpplugin.cpp
@@ -299,10 +299,10 @@ void HelpPlugin::setupUi()
     indexWindow->setWindowTitle(tr(SB_INDEX));
     m_indexItem = new SideBarItem(indexWindow, QLatin1String(SB_INDEX));
 
-    connect(indexWindow, SIGNAL(linkActivated(QUrl)), m_centralWidget,
-        SLOT(setSource(QUrl)));
-    connect(indexWindow, SIGNAL(linksActivated(QMap<QString,QUrl>,QString)),
-        m_centralWidget, SLOT(showTopicChooser(QMap<QString,QUrl>,QString)));
+    connect(indexWindow, &IndexWindow::linkActivated,
+            m_centralWidget, &CentralWidget::open);
+    connect(indexWindow, &IndexWindow::linksActivated,
+        m_centralWidget, &CentralWidget::showTopicChooser);
 
     QMap<QString, Command*> shortcutMap;
     QAction *action = new QAction(tr("Activate Index in Help mode"), m_splitter);
diff --git a/src/shared/help/indexwindow.cpp b/src/shared/help/indexwindow.cpp
index 529bfb2e83..6f5029a927 100644
--- a/src/shared/help/indexwindow.cpp
+++ b/src/shared/help/indexwindow.cpp
@@ -38,18 +38,19 @@
 
 #include <utils/fancylineedit.h>
 #include <utils/hostosinfo.h>
+#include <utils/navigationtreeview.h>
 #include <utils/styledbar.h>
 
+#include <QAbstractItemModel>
 #include <QLayout>
 #include <QLabel>
 #include <QLineEdit>
 #include <QKeyEvent>
 #include <QMenu>
 #include <QContextMenuEvent>
-#include <QListWidgetItem>
 
 #include <QHelpEngine>
-#include <QHelpIndexWidget>
+#include <QHelpIndexModel>
 
 using namespace Help::Internal;
 
@@ -63,9 +64,10 @@ IndexWindow::IndexWindow()
     m_searchLineEdit->setPlaceholderText(QString());
     m_searchLineEdit->setFiltering(true);
     setFocusProxy(m_searchLineEdit);
-    connect(m_searchLineEdit, SIGNAL(textChanged(QString)), this,
-        SLOT(filterIndices(QString)));
+    connect(m_searchLineEdit, &QLineEdit::textChanged,
+            this, &IndexWindow::filterIndices);
     m_searchLineEdit->installEventFilter(this);
+    m_searchLineEdit->setAttribute(Qt::WA_MacShowFocusRect, false);
 
     QLabel *l = new QLabel(tr("&Look for:"));
     l->setBuddy(m_searchLineEdit);
@@ -83,20 +85,22 @@ IndexWindow::IndexWindow()
     toolbar->setLayout(tbLayout);
     layout->addWidget(toolbar);
 
-    QHelpEngine *engine = &LocalHelpManager::helpEngine();
-    m_indexWidget = engine->indexWidget();
+    QHelpIndexModel *indexModel = LocalHelpManager::helpEngine().indexModel();
+    m_filteredIndexModel = new IndexFilterModel(this);
+    m_filteredIndexModel->setSourceModel(indexModel);
+    m_indexWidget = new Utils::NavigationTreeView(this);
+    m_indexWidget->setModel(m_filteredIndexModel);
+    m_indexWidget->setRootIsDecorated(false);
+    m_indexWidget->setEditTriggers(QAbstractItemView::NoEditTriggers);
     m_indexWidget->installEventFilter(this);
-    connect(engine->indexModel(), SIGNAL(indexCreationStarted()), this,
-        SLOT(disableSearchLineEdit()));
-    connect(engine->indexModel(), SIGNAL(indexCreated()), this,
-        SLOT(enableSearchLineEdit()));
-    connect(m_indexWidget, SIGNAL(linkActivated(QUrl,QString)), this,
-        SIGNAL(linkActivated(QUrl)));
-    connect(m_indexWidget, SIGNAL(linksActivated(QMap<QString,QUrl>,QString)),
-        this, SIGNAL(linksActivated(QMap<QString,QUrl>,QString)));
-    connect(m_searchLineEdit, SIGNAL(returnPressed()), m_indexWidget,
-        SLOT(activateCurrentItem()));
-    m_indexWidget->setFrameStyle(QFrame::NoFrame);
+    connect(indexModel, &QHelpIndexModel::indexCreationStarted,
+            this, &IndexWindow::disableSearchLineEdit);
+    connect(indexModel, &QHelpIndexModel::indexCreated,
+            this, &IndexWindow::enableSearchLineEdit);
+    connect(m_indexWidget, &Utils::NavigationTreeView::activated,
+            this, [this](const QModelIndex &index) { open(index); });
+    connect(m_searchLineEdit, &QLineEdit::returnPressed,
+            m_indexWidget, [this]() { open(m_indexWidget->currentIndex()); });
     layout->addWidget(m_indexWidget);
 
     m_indexWidget->viewport()->installEventFilter(this);
@@ -108,10 +112,15 @@ IndexWindow::~IndexWindow()
 
 void IndexWindow::filterIndices(const QString &filter)
 {
+    QModelIndex bestMatch;
     if (filter.contains(QLatin1Char('*')))
-        m_indexWidget->filterIndices(filter, filter);
+        bestMatch = m_filteredIndexModel->filter(filter, filter);
     else
-        m_indexWidget->filterIndices(filter, QString());
+        bestMatch = m_filteredIndexModel->filter(filter, QString());
+    if (bestMatch.isValid()) {
+        m_indexWidget->setCurrentIndex(bestMatch);
+        m_indexWidget->scrollTo(bestMatch);
+    }
 }
 
 bool IndexWindow::eventFilter(QObject *obj, QEvent *e)
@@ -150,9 +159,9 @@ bool IndexWindow::eventFilter(QObject *obj, QEvent *e)
 
             QAction *action = menu.exec();
             if (curTab == action)
-                m_indexWidget->activateCurrentItem();
+                open(idx);
             else if (newTab == action)
-                open(m_indexWidget, idx);
+                open(idx, true/*newPage*/);
         }
     } else if (m_indexWidget && obj == m_indexWidget->viewport()
         && e->type() == QEvent::MouseButtonRelease) {
@@ -162,16 +171,10 @@ bool IndexWindow::eventFilter(QObject *obj, QEvent *e)
             Qt::MouseButtons button = mouseEvent->button();
             if (((button == Qt::LeftButton) && (mouseEvent->modifiers() & Qt::ControlModifier))
                 || (button == Qt::MidButton)) {
-                open(m_indexWidget, idx);
+                open(idx);
             }
         }
     }
-    else if (Utils::HostOsInfo::isMacHost() && obj == m_indexWidget
-             && e->type() == QEvent::KeyPress) {
-        QKeyEvent *ke = static_cast<QKeyEvent*>(e);
-        if (ke->key() == Qt::Key_Return || ke->key() == Qt::Key_Enter)
-           m_indexWidget->activateCurrentItem();
-    }
 
     return QWidget::eventFilter(obj, e);
 }
@@ -187,37 +190,203 @@ void IndexWindow::disableSearchLineEdit()
     m_searchLineEdit->setDisabled(true);
 }
 
-void IndexWindow::setSearchLineEditText(const QString &text)
+void IndexWindow::open(const QModelIndex &index, bool newPage)
 {
-    m_searchLineEdit->setText(text);
+    QString keyword = m_filteredIndexModel->data(index, Qt::DisplayRole).toString();
+    QMap<QString, QUrl> links = LocalHelpManager::helpEngine().indexModel()->linksForKeyword(keyword);
+
+    if (links.size() == 1) {
+        emit linkActivated(links.first(), newPage);
+    } else if (links.size() > 1) {
+        emit linksActivated(links, keyword, newPage);
+    }
 }
 
-QString IndexWindow::searchLineEditText() const
+Qt::DropActions IndexFilterModel::supportedDragActions() const
 {
-    return m_searchLineEdit->text();
+    return sourceModel()->supportedDragActions();
 }
 
-void IndexWindow::open(QHelpIndexWidget* indexWidget, const QModelIndex &index)
+QModelIndex IndexFilterModel::index(int row, int column, const QModelIndex &parent) const
 {
-    QHelpIndexModel *model = qobject_cast<QHelpIndexModel*>(indexWidget->model());
-    if (model) {
-        QString keyword = model->data(index, Qt::DisplayRole).toString();
-        QMap<QString, QUrl> links = model->linksForKeyword(keyword);
+    Q_UNUSED(parent)
+    return createIndex(row, column);
+}
 
-        QUrl url;
-        if (links.count() > 1) {
-            TopicChooser tc(this, keyword, links);
-            if (tc.exec() == QDialog::Accepted)
-                url = tc.link();
-        } else if (links.count() == 1) {
-            url = links.constBegin().value();
-        } else {
-            return;
-        }
+QModelIndex IndexFilterModel::parent(const QModelIndex &child) const
+{
+    Q_UNUSED(child)
+    return QModelIndex();
+}
+
+int IndexFilterModel::rowCount(const QModelIndex &parent) const
+{
+    if (parent.isValid())
+        return 0;
+    return m_toSource.size();
+}
+
+int IndexFilterModel::columnCount(const QModelIndex &parent) const
+{
+    return sourceModel()->columnCount(mapToSource(parent));
+}
 
-        if (!HelpViewer::canOpenPage(url.path()))
-            CentralWidget::instance()->setSource(url);
-        else
-            OpenPagesManager::instance().createPage(url);
+void IndexFilterModel::setSourceModel(QAbstractItemModel *sm)
+{
+    QAbstractItemModel *previousModel = sourceModel();
+    if (previousModel) {
+        disconnect(previousModel, SIGNAL(dataChanged(QModelIndex,QModelIndex)),
+                   this, SLOT(sourceDataChanged(QModelIndex,QModelIndex)));
+        disconnect(previousModel, SIGNAL(rowsInserted(QModelIndex,int,int)),
+                   this, SLOT(sourceRowsInserted(QModelIndex,int,int)));
+        disconnect(previousModel, SIGNAL(rowsRemoved(QModelIndex,int,int)),
+                   this, SLOT(sourceRowsRemoved(QModelIndex,int,int)));
+        disconnect(previousModel, SIGNAL(modelReset()),
+                   this, SLOT(sourceModelReset()));
+    }
+    QAbstractProxyModel::setSourceModel(sm);
+    if (sm) {
+        connect(sm, SIGNAL(dataChanged(QModelIndex,QModelIndex)),
+                this, SLOT(sourceDataChanged(QModelIndex,QModelIndex)));
+        connect(sm, SIGNAL(rowsInserted(QModelIndex,int,int)),
+                this, SLOT(sourceRowsInserted(QModelIndex,int,int)));
+        connect(sm, SIGNAL(rowsRemoved(QModelIndex,int,int)),
+                this, SLOT(sourceRowsRemoved(QModelIndex,int,int)));
+        connect(sm, SIGNAL(modelReset()),
+                this, SLOT(sourceModelReset()));
     }
+    filter(m_filter, m_wildcard);
+}
+
+QModelIndex IndexFilterModel::sibling(int row, int column, const QModelIndex &idx) const
+{
+    return QAbstractItemModel::sibling(row, column, idx);
+}
+
+Qt::ItemFlags IndexFilterModel::flags(const QModelIndex &index) const
+{
+    Q_UNUSED(index)
+    return Qt::ItemIsEnabled | Qt::ItemIsSelectable;
+}
+
+IndexFilterModel::IndexFilterModel(QObject *parent)
+    : QAbstractProxyModel(parent)
+{
+}
+
+QModelIndex IndexFilterModel::filter(const QString &filter, const QString &wildcard)
+{
+    beginResetModel();
+
+    m_filter = filter;
+    m_wildcard = wildcard;
+    m_toSource.clear();
+
+    // adapted copy from QHelpIndexModel
+
+    if (filter.isEmpty() && wildcard.isEmpty()) {
+        int count = sourceModel()->rowCount();
+        m_toSource.reserve(count);
+        for (int i = 0; i < count; ++i)
+            m_toSource.append(i);
+        endResetModel();
+        return index(0, 0);
+    }
+
+    QHelpIndexModel *indexModel = qobject_cast<QHelpIndexModel *>(sourceModel());
+    const QStringList indices = indexModel->stringList();
+    int goodMatch = -1;
+    int perfectMatch = -1;
+
+    if (!wildcard.isEmpty()) {
+        QRegExp regExp(wildcard, Qt::CaseInsensitive);
+        regExp.setPatternSyntax(QRegExp::Wildcard);
+        int i = 0;
+        foreach (const QString &index, indices) {
+            if (index.contains(regExp)) {
+                m_toSource.append(i);
+                if (perfectMatch == -1 && index.startsWith(filter, Qt::CaseInsensitive)) {
+                    if (goodMatch == -1)
+                        goodMatch = m_toSource.size() - 1;
+                    if (filter.length() == index.length()){
+                        perfectMatch = m_toSource.size() - 1;
+                    }
+                } else if (perfectMatch > -1 && index == filter) {
+                    perfectMatch = m_toSource.size() - 1;
+                }
+            }
+            ++i;
+        }
+    } else {
+        int i = 0;
+        foreach (const QString &index, indices) {
+            if (index.contains(filter, Qt::CaseInsensitive)) {
+                m_toSource.append(i);
+                if (perfectMatch == -1 && index.startsWith(filter, Qt::CaseInsensitive)) {
+                    if (goodMatch == -1)
+                        goodMatch = m_toSource.size() - 1;
+                    if (filter.length() == index.length()){
+                        perfectMatch = m_toSource.size() - 1;
+                    }
+                } else if (perfectMatch > -1 && index == filter) {
+                    perfectMatch = m_toSource.size() - 1;
+                }
+            }
+            ++i;
+        }
+    }
+
+    if (perfectMatch == -1)
+        perfectMatch = qMax(0, goodMatch);
+
+    endResetModel();
+    return index(perfectMatch, 0, QModelIndex());
+}
+
+QModelIndex IndexFilterModel::mapToSource(const QModelIndex &proxyIndex) const
+{
+    if (!proxyIndex.isValid() || proxyIndex.parent().isValid() || proxyIndex.row() >= m_toSource.size())
+        return QModelIndex();
+    return index(m_toSource.at(proxyIndex.row()), proxyIndex.column());
+}
+
+QModelIndex IndexFilterModel::mapFromSource(const QModelIndex &sourceIndex) const
+{
+    if (!sourceIndex.isValid() || sourceIndex.parent().isValid())
+        return QModelIndex();
+    int i = m_toSource.indexOf(sourceIndex.row());
+    if (i < 0)
+        return QModelIndex();
+    return index(i, sourceIndex.column());
+}
+
+void IndexFilterModel::sourceDataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight)
+{
+    QModelIndex topLeftIndex = mapFromSource(topLeft);
+    if (!topLeftIndex.isValid())
+        topLeftIndex = index(0, topLeft.column());
+    QModelIndex bottomRightIndex = mapFromSource(bottomRight);
+    if (!bottomRightIndex.isValid())
+        bottomRightIndex = index(0, bottomRight.column());
+    emit dataChanged(topLeftIndex, bottomRightIndex);
+}
+
+void IndexFilterModel::sourceRowsRemoved(const QModelIndex &parent, int start, int end)
+{
+    Q_UNUSED(parent)
+    Q_UNUSED(start)
+    Q_UNUSED(end)
+    filter(m_filter, m_wildcard);
+}
+
+void IndexFilterModel::sourceRowsInserted(const QModelIndex &parent, int start, int end)
+{
+    Q_UNUSED(parent)
+    Q_UNUSED(start)
+    Q_UNUSED(end)
+    filter(m_filter, m_wildcard);
+}
+void IndexFilterModel::sourceModelReset()
+{
+    filter(m_filter, m_wildcard);
 }
diff --git a/src/shared/help/indexwindow.h b/src/shared/help/indexwindow.h
index 1e5f17d53b..0be2a52d88 100644
--- a/src/shared/help/indexwindow.h
+++ b/src/shared/help/indexwindow.h
@@ -30,15 +30,57 @@
 #ifndef INDEXWINDOW_H
 #define INDEXWINDOW_H
 
+#include <QAbstractProxyModel>
+#include <QList>
 #include <QUrl>
 #include <QWidget>
 
 QT_BEGIN_NAMESPACE
-class QHelpIndexWidget;
+class QHelpIndexModel;
 class QModelIndex;
 QT_END_NAMESPACE
 
-namespace Utils { class FancyLineEdit; }
+namespace Utils {
+class FancyLineEdit;
+class NavigationTreeView;
+}
+
+namespace Help {
+namespace Internal {
+
+class IndexFilterModel : public QAbstractProxyModel
+{
+    Q_OBJECT
+
+public:
+    IndexFilterModel(QObject *parent);
+
+    QModelIndex filter(const QString &filter, const QString &wildcard);
+    QModelIndex mapToSource(const QModelIndex &proxyIndex) const;
+    QModelIndex mapFromSource(const QModelIndex &sourceIndex) const;
+    Qt::DropActions supportedDragActions() const;
+    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const;
+    QModelIndex parent(const QModelIndex &child) const;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const;
+
+    void setSourceModel(QAbstractItemModel *sm);
+
+    // QAbstractProxyModel::sibling is broken in Qt 5
+    QModelIndex sibling(int row, int column, const QModelIndex &idx) const;
+
+    Qt::ItemFlags flags(const QModelIndex &index) const;
+private slots:
+    void sourceDataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight);
+    void sourceRowsRemoved(const QModelIndex &parent, int start, int end);
+    void sourceRowsInserted(const QModelIndex &parent, int start, int end);
+    void sourceModelReset();
+
+private:
+    QString m_filter;
+    QString m_wildcard;
+    QList<int> m_toSource;
+};
 
 class IndexWindow : public QWidget
 {
@@ -48,25 +90,24 @@ public:
     IndexWindow();
     ~IndexWindow();
 
-    void setSearchLineEditText(const QString &text);
-    QString searchLineEditText() const;
-
 signals:
-    void linkActivated(const QUrl &link);
+    void linkActivated(const QUrl &link, bool newPage);
     void linksActivated(const QMap<QString, QUrl> &links,
-        const QString &keyword);
+        const QString &keyword, bool newPage);
 
-private slots:
+private:
     void filterIndices(const QString &filter);
     void enableSearchLineEdit();
     void disableSearchLineEdit();
-
-private:
     bool eventFilter(QObject *obj, QEvent *e);
-    void open(QHelpIndexWidget* indexWidget, const QModelIndex &index);
+    void open(const QModelIndex &index, bool newPage = false);
 
     Utils::FancyLineEdit *m_searchLineEdit;
-    QHelpIndexWidget *m_indexWidget;
+    Utils::NavigationTreeView *m_indexWidget;
+    IndexFilterModel *m_filteredIndexModel;
 };
 
+} // Internal
+} // Help
+
 #endif // INDEXWINDOW_H