| /**************************************************************************** |
| ** |
| ** Copyright (C) 2017 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the test suite of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:GPL-EXCEPT$ |
| ** 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 |
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| ** information use the contact form at https://www.qt.io/contact-us. |
| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 3 as published by the Free Software |
| ** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT |
| ** included in the packaging of this file. Please review the following |
| ** information to ensure the GNU General Public License requirements will |
| ** be met: https://www.gnu.org/licenses/gpl-3.0.html. |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #include "rasterwindow.h" |
| |
| RasterWindow::RasterWindow(QWindow *parent) |
| : QWindow(parent) |
| , m_update_pending(false) |
| { |
| m_backingStore = new QBackingStore(this); |
| create(); |
| |
| setGeometry(100, 100, 300, 200); |
| } |
| |
| |
| bool RasterWindow::event(QEvent *event) |
| { |
| if (event->type() == QEvent::UpdateRequest) { |
| m_update_pending = false; |
| renderNow(); |
| return true; |
| } |
| return QWindow::event(event); |
| } |
| |
| void RasterWindow::renderLater() |
| { |
| if (!m_update_pending) { |
| m_update_pending = true; |
| QCoreApplication::postEvent(this, new QEvent(QEvent::UpdateRequest)); |
| } |
| } |
| |
| void RasterWindow::resizeEvent(QResizeEvent *resizeEvent) |
| { |
| m_backingStore->resize(resizeEvent->size()); |
| if (isExposed()) |
| renderNow(); |
| } |
| |
| void RasterWindow::exposeEvent(QExposeEvent *) |
| { |
| if (isExposed()) { |
| renderNow(); |
| } |
| } |
| |
| void RasterWindow::renderNow() |
| { |
| if (!isExposed()) |
| return; |
| |
| QRect rect(0, 0, width(), height()); |
| m_backingStore->beginPaint(rect); |
| |
| QPaintDevice *device = m_backingStore->paintDevice(); |
| QPainter painter(device); |
| |
| painter.fillRect(0, 0, width(), height(), Qt::white); |
| render(&painter); |
| |
| m_backingStore->endPaint(); |
| m_backingStore->flush(rect); |
| } |
| |
| void RasterWindow::render(QPainter *painter) |
| { |
| painter->drawText(QRectF(0, 0, width(), height()), Qt::AlignCenter, QStringLiteral("QWindow")); |
| } |