148 lines
4.6 KiB
C++
148 lines
4.6 KiB
C++
/*
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* Cantata
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*
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* Copyright (c) 2011-2013 Craig Drummond <craig.p.drummond@gmail.com>
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*
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* ----
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "genrecombo.h"
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#include "localize.h"
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#include <QLineEdit>
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#include <QAbstractItemView>
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#include <QStyle>
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#include <QStyleOption>
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// Max number of items before we try to force a scrollbar in popup menu...
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static const int constPopupItemCount=32;
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GenreCombo::GenreCombo(QWidget *p)
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: QComboBox(p)
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{
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setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Fixed);
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update(QSet<QString>());
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setEditable(false);
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}
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void GenreCombo::showPopup()
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{
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QStyleOptionComboBox opt;
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opt.init(this);
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bool usingPopup=style()->styleHint(QStyle::SH_ComboBox_Popup, &opt);
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// Hacky, but if we set the combobox as editable - the style gives the
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// popup a scrollbar. This is more convenient if we have lots of items!
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if (usingPopup && count()>constPopupItemCount) {
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setMaxVisibleItems(constPopupItemCount);
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setEditable(true);
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lineEdit()->setReadOnly(true);
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}
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QComboBox::showPopup();
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// Also, if the size of the popup is more than required for 32 items, then
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// restrict its height...
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if (usingPopup && parentWidget() && view()->parentWidget() && count()>constPopupItemCount) {
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int maxHeight=constPopupItemCount*view()->sizeHintForRow(0);
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QRect geo(view()->parentWidget()->geometry());
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QRect r(view()->parentWidget()->rect());
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if (geo.height()>maxHeight) {
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geo=QRect(geo.x(), geo.y()+(geo.height()-maxHeight), geo.width(), maxHeight);
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r=QRect(r.x(), r.y()+(r.height()-maxHeight), r.width(), maxHeight);
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}
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QPoint popupBot=view()->parentWidget()->mapToGlobal(r.bottomLeft());
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QPoint bot=mapToGlobal(rect().bottomLeft());
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if (popupBot.y()<bot.y()) {
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geo=QRect(geo.x(), geo.y()+(bot.y()-popupBot.y()), geo.width(), geo.height());
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} else {
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QPoint popupTop=view()->parentWidget()->mapToGlobal(r.topLeft());
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QPoint top=mapToGlobal(rect().topLeft());
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if (popupTop.y()>top.y()) {
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geo=QRect(geo.x(), geo.y()-(popupTop.y()-top.y()), geo.width(), geo.height());
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}
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}
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view()->parentWidget()->setGeometry(geo);
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// Hide scrollers - these look ugly...
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foreach (QObject *c, view()->parentWidget()->children()) {
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if (0==qstrcmp("QComboBoxPrivateScroller", c->metaObject()->className())) {
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((QWidget *)c)->setMaximumHeight(0);
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}
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}
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}
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}
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void GenreCombo::hidePopup()
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{
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// Unset editable...
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if (count()>constPopupItemCount) {
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QStyleOptionComboBox opt;
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opt.init(this);
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if (style()->styleHint(QStyle::SH_ComboBox_Popup, &opt)) {
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setEditable(false);
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}
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}
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QComboBox::hidePopup();
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}
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void GenreCombo::update(const QSet<QString> &g)
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{
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if (count() && g==genres) {
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return;
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}
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genres=g;
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QStringList entries=g.toList();
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qSort(entries);
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entries.prepend(i18n("All Genres"));
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if (count()==entries.count()) {
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bool noChange=true;
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for (int i=0; i<count(); ++i) {
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if (itemText(i)!=entries.at(i)) {
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noChange=false;
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break;
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}
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}
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if (noChange) {
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return;
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}
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}
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QString currentFilter = currentIndex() ? currentText() : QString();
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clear();
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addItems(entries);
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if (0==genres.count()) {
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setCurrentIndex(0);
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} else {
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if (!currentFilter.isEmpty()) {
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bool found=false;
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for (int i=1; i<count() && !found; ++i) {
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if (itemText(i) == currentFilter) {
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setCurrentIndex(i);
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found=true;
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}
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}
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if (!found) {
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setCurrentIndex(0);
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}
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}
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}
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}
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