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Diffstat (limited to 'examples/pdfwidgets/pdfviewer/sequentialpagewidget.cpp')
| -rw-r--r-- | examples/pdfwidgets/pdfviewer/sequentialpagewidget.cpp | 192 |
1 files changed, 0 insertions, 192 deletions
diff --git a/examples/pdfwidgets/pdfviewer/sequentialpagewidget.cpp b/examples/pdfwidgets/pdfviewer/sequentialpagewidget.cpp deleted file mode 100644 index 904bc17d2..000000000 --- a/examples/pdfwidgets/pdfviewer/sequentialpagewidget.cpp +++ /dev/null @@ -1,192 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2016 The Qt Company Ltd. -** Contact: http://www.qt.io/licensing/ -** -** This file is part of the QtPDF module of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:LGPL3$ -** Commercial License Usage -** Licensees holding valid commercial Qt licenses may use this file in -** accordance with the commercial license agreement provided with the -** Software or, alternatively, in accordance with the terms contained in -** a written agreement between you and The Qt Company. For licensing terms -** and conditions see http://www.qt.io/terms-conditions. For further -** information use the contact form at http://www.qt.io/contact-us. -** -** GNU Lesser General Public License Usage -** Alternatively, this file may be used under the terms of the GNU Lesser -** General Public License version 3 as published by the Free Software -** Foundation and appearing in the file LICENSE.LGPLv3 included in the -** packaging of this file. Please review the following information to -** ensure the GNU Lesser General Public License version 3 requirements -** will be met: https://www.gnu.org/licenses/lgpl.html. -** -** GNU General Public License Usage -** Alternatively, this file may be used under the terms of the GNU -** General Public License version 2.0 or later as published by the Free -** Software Foundation and appearing in the file LICENSE.GPL included in -** the packaging of this file. Please review the following information to -** ensure the GNU General Public License version 2.0 requirements will be -** met: http://www.gnu.org/licenses/gpl-2.0.html. -** -** $QT_END_LICENSE$ -** -****************************************************************************/ - -#include "sequentialpagewidget.h" -#include "pagerenderer.h" -#include <QPaintEvent> -#include <QPainter> -#include <QPdfDocument> -#include <QGuiApplication> -#include <QScreen> -#include <QLoggingCategory> -#include <QElapsedTimer> - -Q_DECLARE_LOGGING_CATEGORY(lcExample) - -SequentialPageWidget::SequentialPageWidget(QWidget *parent) - : QWidget(parent) - , m_pageCacheLimit(20) - , m_pageRenderer(new PageRenderer()) - , m_background(Qt::darkGray) - , m_placeholderIcon(":icons/images/busy.png") - , m_placeholderBackground(Qt::white) - , m_pageSpacing(3) - , m_topPageShowing(0) - , m_zoom(1.) - , m_screenResolution(QGuiApplication::primaryScreen()->logicalDotsPerInch() / 72.0) - , m_document(nullptr) -{ - connect(m_pageRenderer, SIGNAL(pageReady(int, qreal, QImage)), this, SLOT(pageLoaded(int, qreal, QImage)), Qt::QueuedConnection); - grabGesture(Qt::SwipeGesture); -} - -SequentialPageWidget::~SequentialPageWidget() -{ - delete m_pageRenderer; -} - -void SequentialPageWidget::setDocument(QPdfDocument *document) -{ - m_pageRenderer->setDocument(document); - - m_document = document; - connect(m_document, &QPdfDocument::statusChanged, this, &SequentialPageWidget::documentStatusChanged); - - documentStatusChanged(); -} - -void SequentialPageWidget::setZoom(qreal factor) -{ - m_zoom = factor; - emit zoomChanged(factor); - invalidate(); -} - -QSizeF SequentialPageWidget::pageSize(int page) -{ -// if (!m_pageSizes.length() <= page) -// return QSizeF(); - return m_pageSizes[page] * m_screenResolution * m_zoom; -} - -void SequentialPageWidget::invalidate() -{ - QSizeF totalSize(0, m_pageSpacing); - for (int page = 0; page < pageCount(); ++page) { - QSizeF size = pageSize(page); - totalSize.setHeight(totalSize.height() + size.height()); - if (size.width() > totalSize.width()) - totalSize.setWidth(size.width()); - } - m_totalSize = totalSize.toSize(); - setMinimumSize(m_totalSize); - emit zoomChanged(m_zoom); - qCDebug(lcExample) << "total size" << m_totalSize; - m_pageCache.clear(); - update(); -} - -void SequentialPageWidget::documentStatusChanged() -{ - m_pageSizes.clear(); - m_topPageShowing = 0; - - if (m_document->status() == QPdfDocument::Ready) { - for (int page = 0; page < m_document->pageCount(); ++page) - m_pageSizes.append(m_document->pageSize(page)); - } - - invalidate(); -} - -void SequentialPageWidget::pageLoaded(int page, qreal zoom, QImage image) -{ - Q_UNUSED(zoom) - if (m_cachedPagesLRU.length() > m_pageCacheLimit) - m_pageCache.remove(m_cachedPagesLRU.takeFirst()); - m_pageCache.insert(page, image); - m_cachedPagesLRU.append(page); - update(); -} - -int SequentialPageWidget::pageCount() -{ - return m_pageSizes.count(); -} - -void SequentialPageWidget::paintEvent(QPaintEvent * event) -{ - QPainter painter(this); - painter.fillRect(event->rect(), m_background); - - if (m_pageSizes.isEmpty()) - return; - - // Find the first page that needs to be rendered - int page = 0; - int y = 0; - while (page < pageCount()) { - QSizeF size = pageSize(page); - int height = size.toSize().height(); - if (y + height >= event->rect().top()) - break; - y += height + m_pageSpacing; - ++page; - } - y += m_pageSpacing; - m_topPageShowing = page; - - // Actually render pages - while (y < event->rect().bottom() && page < pageCount()) { - QSizeF size = pageSize(page); - if (m_pageCache.contains(page)) { - const QImage &img = m_pageCache[page]; - painter.fillRect((width() - img.width()) / 2, y, size.width(), size.height(), Qt::white); - painter.drawImage((width() - img.width()) / 2, y, img); - } else { - painter.fillRect((width() - size.width()) / 2, y, size.width(), size.height(), m_placeholderBackground); - painter.drawPixmap((size.width() - m_placeholderIcon.width()) / 2, - (size.height() - m_placeholderIcon.height()) / 2, m_placeholderIcon); - m_pageRenderer->requestPage(page, m_screenResolution * m_zoom); - } - y += size.height() + m_pageSpacing; - ++page; - } - m_bottomPageShowing = page - 1; - emit showingPageRange(m_topPageShowing, m_bottomPageShowing); -} - -qreal SequentialPageWidget::yForPage(int endPage) -{ - // TODO maybe put this loop into a page iterator class - int y = m_pageSpacing; - for (int page = 0; page < pageCount() && page < endPage; ++page) { - QSizeF size = pageSize(page); - int height = size.toSize().height(); - y += height + m_pageSpacing; - } - return y; -} |