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/*
* Cantata
*
* Copyright (c) 2011-2022 Craig Drummond <craig.p.drummond@gmail.com>
*
* ----
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "combobox.h"
#include "lineedit.h"
#include "utils.h"
#include <QAbstractItemView>
#include <QApplication>
#include <QScreen>
#include <QStyleOptionComboBox>
// Max number of items before we try to force a scrollbar in popup menu...
Q_DECL_UNUSED static int maxPopupItemCount = -1;
ComboBox::ComboBox(QWidget* p)
: QComboBox(p), toggleState(false)
{
#if !defined Q_OS_WIN && !defined Q_OS_MAC
if (-1 == maxPopupItemCount) {
if (QApplication::primaryScreen()) {
maxPopupItemCount = ((QApplication::primaryScreen()->availableGeometry().height() / (QFontMetricsF(QApplication::font()).height() * 1.5)) * 0.75) + 0.5;
}
else {
maxPopupItemCount = 32;
}
}
#endif
connect(this, SIGNAL(editTextChanged(QString)), this, SIGNAL(textChanged(QString)));
}
void ComboBox::setEditable(bool editable)
{
QComboBox::setEditable(editable);
if (editable) {
LineEdit* edit = new LineEdit(this);
setLineEdit(edit);
}
}
#if !defined Q_OS_WIN && !defined Q_OS_MAC
void ComboBox::showPopup()
{
QStyleOptionComboBox opt;
initStyleOption(&opt);
toggleState = false;
bool hack = 0 != style()->styleHint(QStyle::SH_ComboBox_Popup, &opt, this, nullptr);
if (hack && count() > (maxPopupItemCount - 2)) {
toggleState = !isEditable();
// Hacky, but if we set the combobox as editable - the style gives the
// popup a scrollbar. This is more convenient if we have lots of items!
if (toggleState) {
setMaxVisibleItems(maxPopupItemCount);
QComboBox::setEditable(true);
lineEdit()->setReadOnly(true);
}
}
QComboBox::showPopup();
if (hack && view()->parentWidget() && count() > maxPopupItemCount) {
// Also, if the size of the popup is more than required for 32 items, then
// restrict its height...
int maxHeight = maxPopupItemCount * view()->sizeHintForRow(0);
QRect geo(view()->parentWidget()->geometry());
QRect r(view()->parentWidget()->rect());
if (geo.height() > maxHeight) {
geo = QRect(geo.x(), geo.y() + (geo.height() - maxHeight), geo.width(), maxHeight);
r = QRect(r.x(), r.y() + (r.height() - maxHeight), r.width(), maxHeight);
}
QPoint popupBot = view()->parentWidget()->mapToGlobal(r.bottomLeft());
QPoint bot = mapToGlobal(rect().bottomLeft());
if (popupBot.y() < bot.y()) {
geo = QRect(geo.x(), geo.y() + (bot.y() - popupBot.y()), geo.width(), geo.height());
}
else {
QPoint popupTop = view()->parentWidget()->mapToGlobal(r.topLeft());
QPoint top = mapToGlobal(rect().topLeft());
if (popupTop.y() > top.y()) {
geo = QRect(geo.x(), geo.y() - (popupTop.y() - top.y()), geo.width(), geo.height());
}
}
view()->parentWidget()->setGeometry(geo);
// Hide scrollers - these look ugly...
for (QObject* c : view()->parentWidget()->children()) {
if (0 == qstrcmp("QComboBoxPrivateScroller", c->metaObject()->className())) {
static_cast<QWidget*>(c)->setMaximumHeight(0);
}
}
}
}
void ComboBox::hidePopup()
{
if (toggleState) {
QComboBox::setEditable(false);
toggleState = false;
}
QComboBox::hidePopup();
}
#endif
#include "moc_combobox.cpp"
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