| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the examples of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:BSD$ |
| ** 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 https://www.qt.io/terms-conditions. For further |
| ** information use the contact form at https://www.qt.io/contact-us. |
| ** |
| ** BSD License Usage |
| ** Alternatively, you may use this file under the terms of the BSD license |
| ** as follows: |
| ** |
| ** "Redistribution and use in source and binary forms, with or without |
| ** modification, are permitted provided that the following conditions are |
| ** met: |
| ** * Redistributions of source code must retain the above copyright |
| ** notice, this list of conditions and the following disclaimer. |
| ** * Redistributions in binary form must reproduce the above copyright |
| ** notice, this list of conditions and the following disclaimer in |
| ** the documentation and/or other materials provided with the |
| ** distribution. |
| ** * Neither the name of The Qt Company Ltd nor the names of its |
| ** contributors may be used to endorse or promote products derived |
| ** from this software without specific prior written permission. |
| ** |
| ** |
| ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #include "window.h" |
| |
| #include <private/qguiapplication_p.h> |
| |
| #include <QBackingStore> |
| #include <QPainter> |
| |
| static int colorIndexId = 0; |
| |
| QColor colorTable[] = |
| { |
| QColor("#f09f8f"), |
| QColor("#a2bff2"), |
| QColor("#c0ef8f") |
| }; |
| |
| Window::Window(QScreen *screen) |
| : QWindow(screen) |
| , m_backgroundColorIndex(colorIndexId++) |
| { |
| initialize(); |
| } |
| |
| Window::Window(QWindow *parent) |
| : QWindow(parent) |
| , m_backgroundColorIndex(colorIndexId++) |
| { |
| initialize(); |
| } |
| |
| void Window::initialize() |
| { |
| if (parent()) |
| setGeometry(QRect(160, 120, 320, 240)); |
| else { |
| setFlags(flags() | Qt::WindowTitleHint | Qt::WindowSystemMenuHint |
| | Qt::WindowMinMaxButtonsHint | Qt::WindowCloseButtonHint); |
| const QSize baseSize = QSize(640, 480); |
| setGeometry(QRect(geometry().topLeft(), baseSize)); |
| |
| setSizeIncrement(QSize(10, 10)); |
| setBaseSize(baseSize); |
| setMinimumSize(QSize(240, 160)); |
| setMaximumSize(QSize(800, 600)); |
| } |
| |
| create(); |
| m_backingStore = new QBackingStore(this); |
| |
| m_image = QImage(geometry().size(), QImage::Format_RGB32); |
| m_image.fill(colorTable[m_backgroundColorIndex % (sizeof(colorTable) / sizeof(colorTable[0]))].rgba()); |
| |
| m_lastPos = QPoint(-1, -1); |
| m_renderTimer = 0; |
| } |
| |
| void Window::mousePressEvent(QMouseEvent *event) |
| { |
| m_lastPos = event->pos(); |
| } |
| |
| void Window::mouseMoveEvent(QMouseEvent *event) |
| { |
| if (m_lastPos != QPoint(-1, -1)) { |
| QPainter p(&m_image); |
| p.setRenderHint(QPainter::Antialiasing); |
| p.drawLine(m_lastPos, event->pos()); |
| m_lastPos = event->pos(); |
| |
| scheduleRender(); |
| } |
| } |
| |
| void Window::mouseReleaseEvent(QMouseEvent *event) |
| { |
| if (m_lastPos != QPoint(-1, -1)) { |
| QPainter p(&m_image); |
| p.setRenderHint(QPainter::Antialiasing); |
| p.drawLine(m_lastPos, event->pos()); |
| m_lastPos = QPoint(-1, -1); |
| |
| scheduleRender(); |
| } |
| } |
| |
| void Window::exposeEvent(QExposeEvent *) |
| { |
| scheduleRender(); |
| } |
| |
| void Window::resizeEvent(QResizeEvent *) |
| { |
| QImage old = m_image; |
| |
| int width = qMax(geometry().width(), old.width()); |
| int height = qMax(geometry().height(), old.height()); |
| |
| if (width > old.width() || height > old.height()) { |
| m_image = QImage(width, height, QImage::Format_RGB32); |
| m_image.fill(colorTable[(m_backgroundColorIndex) % (sizeof(colorTable) / sizeof(colorTable[0]))].rgba()); |
| |
| QPainter p(&m_image); |
| p.drawImage(0, 0, old); |
| } |
| scheduleRender(); |
| } |
| |
| void Window::keyPressEvent(QKeyEvent *event) |
| { |
| switch (event->key()) { |
| case Qt::Key_Backspace: |
| m_text.chop(1); |
| break; |
| case Qt::Key_Enter: |
| case Qt::Key_Return: |
| m_text.append('\n'); |
| break; |
| default: |
| m_text.append(event->text()); |
| break; |
| } |
| scheduleRender(); |
| } |
| |
| void Window::scheduleRender() |
| { |
| if (!m_renderTimer) |
| m_renderTimer = startTimer(1); |
| } |
| |
| void Window::timerEvent(QTimerEvent *) |
| { |
| if (isExposed()) |
| render(); |
| killTimer(m_renderTimer); |
| m_renderTimer = 0; |
| } |
| |
| void Window::render() |
| { |
| QRect rect(QPoint(), geometry().size()); |
| m_backingStore->resize(rect.size()); |
| |
| m_backingStore->beginPaint(rect); |
| |
| QPaintDevice *device = m_backingStore->paintDevice(); |
| |
| QPainter p(device); |
| p.drawImage(0, 0, m_image); |
| |
| QFont font; |
| font.setPixelSize(32); |
| |
| p.setFont(font); |
| p.drawText(rect, 0, m_text); |
| |
| m_backingStore->endPaint(); |
| m_backingStore->flush(rect); |
| } |
| |
| |