path: root/launcher/ui/instanceview/InstanceView.cpp

/* Copyright 2013-2021 MultiMC Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "InstanceView.h"

#include <QPainter>
#include <QApplication>
#include <QtMath>
#include <QMouseEvent>
#include <QListView>
#include <QPersistentModelIndex>
#include <QDrag>
#include <QMimeData>
#include <QCache>
#include <QScrollBar>
#include <QAccessible>

#include "VisualGroup.h"
#include <QDebug>

#include <Application.h>
#include <InstanceList.h>


template <typename T> bool listsIntersect(const QList<T> &l1, const QList<T> t2)
{
    for (auto &item : l1)
    {
        if (t2.contains(item))
        {
            return true;
        }
    }
    return false;
}

InstanceView::InstanceView(QWidget *parent)
    : QAbstractItemView(parent)
{
    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
    setAcceptDrops(true);
    setAutoScroll(true);
}

InstanceView::~InstanceView()
{
    qDeleteAll(m_groups);
    m_groups.clear();
}

void InstanceView::setModel(QAbstractItemModel *model)
{
    QAbstractItemView::setModel(model);
    connect(model, &QAbstractItemModel::modelReset, this, &InstanceView::modelReset);
    connect(model, &QAbstractItemModel::rowsRemoved, this, &InstanceView::rowsRemoved);
}

void InstanceView::dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles)
{
    scheduleDelayedItemsLayout();
}
void InstanceView::rowsInserted(const QModelIndex &parent, int start, int end)
{
    scheduleDelayedItemsLayout();
}

void InstanceView::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end)
{
    scheduleDelayedItemsLayout();
}

void InstanceView::modelReset()
{
    scheduleDelayedItemsLayout();
}

void InstanceView::rowsRemoved()
{
    scheduleDelayedItemsLayout();
}

void InstanceView::currentChanged(const QModelIndex& current, const QModelIndex& previous)
{
    QAbstractItemView::currentChanged(current, previous);
    // TODO: for accessibility support, implement+register a factory, steal QAccessibleTable from Qt and return an instance of it for InstanceView.
#ifndef QT_NO_ACCESSIBILITY
    if (QAccessible::isActive() && current.isValid()) {
        QAccessibleEvent event(this, QAccessible::Focus);
        event.setChild(current.row());
        QAccessible::updateAccessibility(&event);
    }
#endif /* !QT_NO_ACCESSIBILITY */
}


class LocaleString : public QString
{
public:
    LocaleString(const char *s) : QString(s)
    {
    }
    LocaleString(const QString &s) : QString(s)
    {
    }
};

inline bool operator<(const LocaleString &lhs, const LocaleString &rhs)
{
    return (QString::localeAwareCompare(lhs, rhs) < 0);
}

void InstanceView::updateScrollbar()
{
    int previousScroll = verticalScrollBar()->value();
    if (m_groups.isEmpty())
    {
        verticalScrollBar()->setRange(0, 0);
    }
    else
    {
        int totalHeight = 0;
        // top margin
        totalHeight += m_categoryMargin;
        int itemScroll = 0;
        for (auto category : m_groups)
        {
            category->m_verticalPosition = totalHeight;
            totalHeight += category->totalHeight() + m_categoryMargin;
            if(!itemScroll && category->totalHeight() != 0)
            {
                itemScroll = category->contentHeight() / category->numRows();
            }
        }
        // do not divide by zero
        if(itemScroll == 0)
            itemScroll = 64;

        totalHeight += m_bottomMargin;
        verticalScrollBar()->setSingleStep ( itemScroll );
        const int rowsPerPage = qMax ( viewport()->height() / itemScroll, 1 );
        verticalScrollBar()->setPageStep ( rowsPerPage * itemScroll );

        verticalScrollBar()->setRange(0, totalHeight -