modelmenu.cpp Example File
demos/browser/modelmenu.cpp
#include "modelmenu.h"
#include <QtCore/QAbstractItemModel>
#include <qdebug.h>
ModelMenu::ModelMenu(QAbstractItemModel *model, QWidget * parent): QMenu(parent),
m_maxRows(7),
m_maxWidth(-1),
m_model(model)
{
connect(this, SIGNAL(aboutToShow()), this, SLOT(aboutToShow()));
}
bool ModelMenu::prePopulated()
{
return false;
}
void ModelMenu::postPopulated()
{
}
QAbstractItemModel *ModelMenu::model() const
{
return m_model;
}
void ModelMenu::setMaxRows(int max)
{
m_maxRows = max;
}
int ModelMenu::maxRows() const
{
return m_maxRows;
}
Q_DECLARE_METATYPE(QModelIndex)
void ModelMenu::aboutToShow()
{
if (QMenu *menu = qobject_cast<QMenu*>(sender())) {
QVariant v = menu->menuAction()->data();
if (v.canConvert<int>()) {
int row = v.toInt();
QModelIndex idx = m_model->index(row, 0);
createMenu(idx, -1, menu);
disconnect(menu, SIGNAL(aboutToShow()), this, SLOT(aboutToShow()));
return;
}
}
clear();
if (prePopulated())
addSeparator();
createMenu(QModelIndex(), m_maxRows, this);
postPopulated();
}
void ModelMenu::createMenu(const QModelIndex &parent, int max, QMenu *menu)
{
for history, remove somehow
if (parent.row() == 0 && !menu && m_model->rowCount(parent) < 20)
return;
if (!menu) {
QString title = parent.data().toString();
menu = new QMenu(title, this);
addMenu(menu);
menu->menuAction()->setData(parent.row());
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*)));
for history, remove somehow
int start = 0;
if (parent.row() == 0 && menu != this)
start = 20;
for (int i = start; i < end; ++i) {
QModelIndex idx = m_model->index(i, 0, parent);
if (m_model->hasChildren(idx))
createMenu(idx, -1);
else
menu->addAction(makeAction(idx));
}
}
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("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);
}
}