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/* Copyright 2013-2019 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 <QHeaderView>
#include <QApplication>
#include <QMouseEvent>
#include <QDrag>
#include <QPainter>
#include "VersionListView.h"
#include "Common.h"
VersionListView::VersionListView(QWidget *parent)
:QTreeView ( parent )
{
m_emptyString = tr("No versions are currently available.");
}
void VersionListView::rowsInserted(const QModelIndex &parent, int start, int end)
{
m_itemCount += end-start+1;
updateEmptyViewPort();
QTreeView::rowsInserted(parent, start, end);
}
void VersionListView::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end)
{
m_itemCount -= end-start+1;
updateEmptyViewPort();
QTreeView::rowsInserted(parent, start, end);
}
void VersionListView::setModel(QAbstractItemModel *model)
{
m_itemCount = model->rowCount();
updateEmptyViewPort();
QTreeView::setModel(model);
}
void VersionListView::reset()
{
if(model())
{
m_itemCount = model()->rowCount();
}
else {
m_itemCount = 0;
}
updateEmptyViewPort();
QTreeView::reset();
}
void VersionListView::setEmptyString(QString emptyString)
{
m_emptyString = emptyString;
updateEmptyViewPort();
}
void VersionListView::setEmptyErrorString(QString emptyErrorString)
{
m_emptyErrorString = emptyErrorString;
updateEmptyViewPort();
}
void VersionListView::setEmptyMode(VersionListView::EmptyMode mode)
{
m_emptyMode = mode;
updateEmptyViewPort();
}
void VersionListView::updateEmptyViewPort()
{
setAccessibleDescription(currentEmptyString());
if(!m_itemCount)
{
viewport()->update();
}
}
void VersionListView::paintEvent(QPaintEvent *event)
{
if(m_itemCount)
{
QTreeView::paintEvent(event);
}
else
{
paintInfoLabel(event);
}
}
QString VersionListView::currentEmptyString() const
{
if(m_itemCount) {
return QString();
}
switch(m_emptyMode)
{
default:
case VersionListView::Empty:
return QString();
case VersionListView::String:
return m_emptyString;
case VersionListView::ErrorString:
return m_emptyErrorString;
}
}
void VersionListView::paintInfoLabel(QPaintEvent *event) const
{
QString emptyString = currentEmptyString();
//calculate the rect for the overlay
QPainter painter(viewport());
painter.setRenderHint(QPainter::Antialiasing, true);
QFont font("sans", 20);
font.setBold(true);
QRect bounds = viewport()->geometry();
bounds.moveTop(0);
auto innerBounds = bounds;
innerBounds.adjust(10, 10, -10, -10);
QColor background = QApplication::palette().color(QPalette::Foreground);
QColor foreground = QApplication::palette().color(QPalette::Base);
foreground.setAlpha(190);
painter.setFont(font);
auto fontMetrics = painter.fontMetrics();
auto textRect = fontMetrics.boundingRect(innerBounds, Qt::AlignHCenter | Qt::TextWordWrap, emptyString);
textRect.moveCenter(bounds.center());
auto wrapRect = textRect;
wrapRect.adjust(-10, -10, 10, 10);
//check if we are allowed to draw in our area
if (!event->rect().intersects(wrapRect)) {
return;
}
painter.setBrush(QBrush(background));
painter.setPen(foreground);
painter.drawRoundedRect(wrapRect, 5.0, 5.0);
painter.setPen(foreground);
painter.setFont(font);
painter.drawText(textRect, Qt::AlignHCenter | Qt::TextWordWrap, emptyString);
}
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