modelmenu.cpp Example File

webenginewidgets/demobrowser/modelmenu.cpp
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#include "modelmenu.h" #include <QtCore/QAbstractItemModel> #include <qdebug.h> ModelMenu::ModelMenu(QWidget * parent) : QMenu(parent) , m_maxRows(7) , m_firstSeparator(-1) , m_maxWidth(-1) , m_hoverRole(0) , m_separatorRole(0) , m_model(0) { connect(this, SIGNAL(aboutToShow()), this, SLOT(aboutToShow())); } bool ModelMenu::prePopulated() { return false; } void ModelMenu::postPopulated() { } void ModelMenu::setModel(QAbstractItemModel *model) { m_model = model; } QAbstractItemModel *ModelMenu::model() const { return m_model; } void ModelMenu::setMaxRows(int max) { m_maxRows = max; } int ModelMenu::maxRows() const { return m_maxRows; } void ModelMenu::setFirstSeparator(int offset) { m_firstSeparator = offset; } int ModelMenu::firstSeparator() const { return m_firstSeparator; } void ModelMenu::setRootIndex(const QModelIndex &index) { m_root = index; } QModelIndex ModelMenu::rootIndex() const { return m_root; } void ModelMenu::setHoverRole(int role) { m_hoverRole = role; } int ModelMenu::hoverRole() const { return m_hoverRole; } void ModelMenu::setSeparatorRole(int role) { m_separatorRole = role; } int ModelMenu::separatorRole() const { return m_separatorRole; } Q_DECLARE_METATYPE(QModelIndex) void ModelMenu::aboutToShow() { if (QMenu *menu = qobject_cast<QMenu*>(sender())) { QVariant v = menu->menuAction()->data(); if (v.canConvert<QModelIndex>()) { QModelIndex idx = qvariant_cast<QModelIndex>(v); createMenu(idx, -1, menu, menu); disconnect(menu, SIGNAL(aboutToShow()), this, SLOT(aboutToShow())); return; } } clear(); if (prePopulated()) addSeparator(); int max = m_maxRows; if (max != -1) max += m_firstSeparator; createMenu(m_root, max, this, this); postPopulated(); } void ModelMenu::createMenu(const QModelIndex &parent, int max, QMenu *parentMenu, QMenu *menu) { if (!menu) { QString title = parent.data().toString(); menu = new QMenu(title, this); QIcon icon = qvariant_cast<QIcon>(parent.data(Qt::DecorationRole)); menu->setIcon(icon); parentMenu->addMenu(menu); QVariant v; v.setValue(parent); menu->menuAction()->setData(v); connect(menu, SIGNAL(aboutToShow()), this, SLOT(aboutToShow())); return; } int end = m_model->rowCount(parent); if (max != -1) end = qMin(max, end); connect(menu, SIGNAL(triggered(QAction*)), this, SLOT(triggered(QAction*))); connect(menu, SIGNAL(hovered(QAction*)), this, SLOT(hovered(QAction*))); for (int i = 0; i < end; ++i) { QModelIndex idx = m_model->index(i, 0, parent); if (m_model->hasChildren(idx)) { createMenu(idx, -1, menu); } else { if (m_separatorRole != 0 && idx.data(m_separatorRole).toBool()) addSeparator(); else menu->addAction(makeAction(idx)); } if (menu == this && i == m_firstSeparator - 1) addSeparator(); } } QAction *ModelMenu::makeAction(const QModelIndex &index) { QIcon icon = qvariant_cast<QIcon>(index.data(Qt::DecorationRole)); QAction *action = makeAction(icon, index.data().toString(), this); QVariant v; v.setValue(index); action->setData(v); return action; } QAction *ModelMenu::makeAction(const QIcon &icon, const QString &text, QObject *parent) { QFontMetrics fm(font()); if (-1 == m_maxWidth) m_maxWidth = fm.width(QLatin1Char('m')) * 30; QString smallText = fm.elidedText(text, Qt::ElideMiddle, m_maxWidth); return new QAction(icon, smallText, parent); } void ModelMenu::triggered(QAction *action) { QVariant v = action->data(); if (v.canConvert<QModelIndex>()) { QModelIndex idx = qvariant_cast<QModelIndex>(v); emit activated(idx); } } void ModelMenu::hovered(QAction *action) { QVariant v = action->data(); if (v.canConvert<QModelIndex>()) { QModelIndex idx = qvariant_cast<QModelIndex>(v); QString hoveredString = idx.data(m_hoverRole).toString(); if (!hoveredString.isEmpty()) emit hovered(hoveredString); } }

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