dec934cd96
The setGeometry call triggers a resizeEvent() so make sure the backing store is created before that. Change-Id: I26aa3ef6c0515311e3ca21f938a92ca1a20d0030 Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com>
125 lines
3.5 KiB
C++
125 lines
3.5 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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** the names of its contributors may be used to endorse or promote
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** products derived from this software without specific prior written
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** permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "rasterwindow.h"
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//! [1]
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RasterWindow::RasterWindow(QWindow *parent)
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: QWindow(parent)
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, m_update_pending(false)
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{
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m_backingStore = new QBackingStore(this);
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create();
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setGeometry(100, 100, 300, 200);
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}
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//! [1]
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//! [7]
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bool RasterWindow::event(QEvent *event)
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{
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if (event->type() == QEvent::UpdateRequest) {
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m_update_pending = false;
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renderNow();
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return true;
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}
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return QWindow::event(event);
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}
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//! [7]
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//! [6]
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void RasterWindow::renderLater()
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{
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if (!m_update_pending) {
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m_update_pending = true;
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QCoreApplication::postEvent(this, new QEvent(QEvent::UpdateRequest));
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}
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}
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//! [6]
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//! [5]
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void RasterWindow::resizeEvent(QResizeEvent *resizeEvent)
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{
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m_backingStore->resize(resizeEvent->size());
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if (isExposed())
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renderNow();
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}
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//! [5]
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//! [2]
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void RasterWindow::exposeEvent(QExposeEvent *)
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{
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if (isExposed()) {
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renderNow();
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}
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}
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//! [2]
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//! [3]
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void RasterWindow::renderNow()
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{
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if (!isExposed())
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return;
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QRect rect(0, 0, width(), height());
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m_backingStore->beginPaint(rect);
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QPaintDevice *device = m_backingStore->paintDevice();
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QPainter painter(device);
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painter.fillRect(0, 0, width(), height(), Qt::white);
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render(&painter);
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m_backingStore->endPaint();
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m_backingStore->flush(rect);
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}
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//! [3]
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//! [4]
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void RasterWindow::render(QPainter *painter)
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{
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painter->drawText(QRectF(0, 0, width(), height()), Qt::AlignCenter, QStringLiteral("QWindow"));
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}
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//! [4]
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