163 lines
4.0 KiB
C++
163 lines
4.0 KiB
C++
/* Copyright 2013-2021 MultiMC Contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <QHeaderView>
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#include <QApplication>
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#include <QMouseEvent>
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#include <QDrag>
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#include <QPainter>
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#include "VersionListView.h"
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VersionListView::VersionListView(QWidget *parent)
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:QTreeView ( parent )
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{
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m_emptyString = tr("No versions are currently available.");
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}
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void VersionListView::rowsInserted(const QModelIndex &parent, int start, int end)
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{
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m_itemCount += end-start+1;
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updateEmptyViewPort();
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QTreeView::rowsInserted(parent, start, end);
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}
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void VersionListView::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end)
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{
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m_itemCount -= end-start+1;
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updateEmptyViewPort();
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QTreeView::rowsInserted(parent, start, end);
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}
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void VersionListView::setModel(QAbstractItemModel *model)
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{
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m_itemCount = model->rowCount();
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updateEmptyViewPort();
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QTreeView::setModel(model);
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}
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void VersionListView::reset()
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{
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if(model())
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{
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m_itemCount = model()->rowCount();
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}
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else {
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m_itemCount = 0;
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}
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updateEmptyViewPort();
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QTreeView::reset();
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}
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void VersionListView::setEmptyString(QString emptyString)
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{
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m_emptyString = emptyString;
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updateEmptyViewPort();
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}
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void VersionListView::setEmptyErrorString(QString emptyErrorString)
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{
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m_emptyErrorString = emptyErrorString;
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updateEmptyViewPort();
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}
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void VersionListView::setEmptyMode(VersionListView::EmptyMode mode)
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{
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m_emptyMode = mode;
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updateEmptyViewPort();
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}
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void VersionListView::updateEmptyViewPort()
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{
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#ifndef QT_NO_ACCESSIBILITY
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setAccessibleDescription(currentEmptyString());
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#endif /* !QT_NO_ACCESSIBILITY */
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if(!m_itemCount)
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{
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viewport()->update();
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}
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}
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void VersionListView::paintEvent(QPaintEvent *event)
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{
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if(m_itemCount)
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{
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QTreeView::paintEvent(event);
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}
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else
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{
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paintInfoLabel(event);
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}
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}
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QString VersionListView::currentEmptyString() const
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{
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if(m_itemCount) {
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return QString();
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}
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switch(m_emptyMode)
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{
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default:
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case VersionListView::Empty:
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return QString();
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case VersionListView::String:
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return m_emptyString;
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case VersionListView::ErrorString:
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return m_emptyErrorString;
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}
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}
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void VersionListView::paintInfoLabel(QPaintEvent *event) const
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{
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QString emptyString = currentEmptyString();
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//calculate the rect for the overlay
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QPainter painter(viewport());
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painter.setRenderHint(QPainter::Antialiasing, true);
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QFont font("sans", 20);
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font.setBold(true);
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QRect bounds = viewport()->geometry();
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bounds.moveTop(0);
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auto innerBounds = bounds;
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innerBounds.adjust(10, 10, -10, -10);
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QColor background = QApplication::palette().color(QPalette::WindowText);
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QColor foreground = QApplication::palette().color(QPalette::Base);
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foreground.setAlpha(190);
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painter.setFont(font);
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auto fontMetrics = painter.fontMetrics();
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auto textRect = fontMetrics.boundingRect(innerBounds, Qt::AlignHCenter | Qt::TextWordWrap, emptyString);
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textRect.moveCenter(bounds.center());
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auto wrapRect = textRect;
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wrapRect.adjust(-10, -10, 10, 10);
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//check if we are allowed to draw in our area
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if (!event->rect().intersects(wrapRect)) {
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return;
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}
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painter.setBrush(QBrush(background));
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painter.setPen(foreground);
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painter.drawRoundedRect(wrapRect, 5.0, 5.0);
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painter.setPen(foreground);
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painter.setFont(font);
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painter.drawText(textRect, Qt::AlignHCenter | Qt::TextWordWrap, emptyString);
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}
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