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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#include "treeviewcombobox.h"
#include <QWheelEvent>
using namespace Utils;
TreeViewComboBoxView::TreeViewComboBoxView(QWidget *parent)
: QTreeView(parent)
{
// TODO: Disable the root for all items (with a custom delegate?)
setRootIsDecorated(false);
}
void TreeViewComboBoxView::adjustWidth(int width)
{
setMaximumWidth(width);
setMinimumWidth(qMin(qMax(sizeHintForColumn(0), minimumSizeHint().width()), width));
}
TreeViewComboBox::TreeViewComboBox(QWidget *parent)
: QComboBox(parent)
{
m_view = new TreeViewComboBoxView;
m_view->setHeaderHidden(true);
m_view->setItemsExpandable(true);
setView(m_view);
m_view->viewport()->installEventFilter(this);
}
QModelIndex TreeViewComboBox::indexAbove(QModelIndex index)
{
do
index = m_view->indexAbove(index);
while (index.isValid() && !(model()->flags(index) & Qt::ItemIsSelectable));
return index;
}
QModelIndex TreeViewComboBox::indexBelow(QModelIndex index)
{
do
index = m_view->indexBelow(index);
while (index.isValid() && !(model()->flags(index) & Qt::ItemIsSelectable));
return index;
}
QModelIndex TreeViewComboBox::lastIndex(const QModelIndex &index)
{
if (index.isValid() && !m_view->isExpanded(index))
return index;
int rows = m_view->model()->rowCount(index);
if (rows == 0)
return index;
return lastIndex(m_view->model()->index(rows - 1, 0, index));
}
void TreeViewComboBox::wheelEvent(QWheelEvent *e)
{
QModelIndex index = m_view->currentIndex();
if (e->angleDelta().y() > 0)
index = indexAbove(index);
else if (e->angleDelta().y() < 0)
index = indexBelow(index);
e->accept();
if (!index.isValid())
return;
setCurrentIndex(index);
// for compatibility we emit activated with a useless row parameter
emit activated(index.row());
}
void TreeViewComboBox::keyPressEvent(QKeyEvent *e)
{
if (e->key() == Qt::Key_Up || e->key() == Qt::Key_PageUp) {
setCurrentIndex(indexAbove(m_view->currentIndex()));
} else if (e->key() == Qt::Key_Down || e->key() == Qt::Key_PageDown) {
setCurrentIndex(indexBelow(m_view->currentIndex()));
} else if (e->key() == Qt::Key_Home) {
QModelIndex index = m_view->model()->index(0, 0);
if (index.isValid() && !(model()->flags(index) & Qt::ItemIsSelectable))
index = indexBelow(index);
setCurrentIndex(index);
} else if (e->key() == Qt::Key_End) {
QModelIndex index = lastIndex(m_view->rootIndex());
if (index.isValid() && !(model()->flags(index) & Qt::ItemIsSelectable))
index = indexAbove(index);
setCurrentIndex(index);
} else {
QComboBox::keyPressEvent(e);
return;
}
e->accept();
}
void TreeViewComboBox::setCurrentIndex(const QModelIndex &index)
{
if (!index.isValid())
return;
setRootModelIndex(model()->parent(index));
QComboBox::setCurrentIndex(index.row());
setRootModelIndex(QModelIndex());
m_view->setCurrentIndex(index);
}
bool TreeViewComboBox::eventFilter(QObject *object, QEvent *event)
{
if (event->type() == QEvent::MouseButtonPress && object == view()->viewport()) {
auto* mouseEvent = static_cast<QMouseEvent*>(event);
QModelIndex index = view()->indexAt(mouseEvent->pos());
if (!view()->visualRect(index).contains(mouseEvent->pos()))
m_skipNextHide = true;
}
return false;
}
void TreeViewComboBox::showPopup()
{
m_view->adjustWidth(topLevelWidget()->geometry().width());
QComboBox::showPopup();
}
void TreeViewComboBox::hidePopup()
{
if (m_skipNextHide)
m_skipNextHide = false;
else
QComboBox::hidePopup();
}
TreeViewComboBoxView *TreeViewComboBox::view() const
{
return m_view;
}
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