234 lines
6.5 KiB
C++
234 lines
6.5 KiB
C++
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/****************************************************************************
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**
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the demonstration applications of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtCore>
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#include <QtGui>
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#include "flickable.h"
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// Returns a list of two-word color names
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static QStringList colorPairs(int max)
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{
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// capitalize the first letter
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QStringList colors = QColor::colorNames();
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colors.removeAll("transparent");
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int num = colors.count();
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for (int c = 0; c < num; ++c)
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colors[c] = colors[c][0].toUpper() + colors[c].mid(1);
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// combine two colors, e.g. "lime skyblue"
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QStringList combinedColors;
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for (int i = 0; i < num; ++i)
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for (int j = 0; j < num; ++j)
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combinedColors << QString("%1 %2").arg(colors[i]).arg(colors[j]);
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// randomize it
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colors.clear();
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while (combinedColors.count()) {
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int i = qrand() % combinedColors.count();
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colors << combinedColors[i];
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combinedColors.removeAt(i);
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if (colors.count() == max)
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break;
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}
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return colors;
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}
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class ColorList : public QWidget, public Flickable
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{
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Q_OBJECT
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public:
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ColorList(QWidget *parent = 0)
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: QWidget(parent) {
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m_offset = 0;
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m_height = QFontMetrics(font()).height() + 5;
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m_highlight = -1;
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m_selected = -1;
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QStringList colors = colorPairs(999);
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for (int i = 0; i < colors.count(); ++i) {
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QString c = colors[i];
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QString str;
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str.sprintf("%4d", i + 1);
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m_colorNames << (str + " " + c);
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QStringList duet = c.split(' ');
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m_firstColor << duet[0];
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m_secondColor << duet[1];
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}
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setAttribute(Qt::WA_OpaquePaintEvent, true);
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setAttribute(Qt::WA_NoSystemBackground, true);
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setMouseTracking(true);
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Flickable::setAcceptMouseClick(this);
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}
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protected:
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// reimplement from Flickable
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virtual QPoint scrollOffset() const {
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return QPoint(0, m_offset);
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}
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// reimplement from Flickable
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virtual void setScrollOffset(const QPoint &offset) {
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int yy = offset.y();
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if (yy != m_offset) {
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m_offset = qBound(0, yy, m_height * m_colorNames.count() - height());
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update();
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}
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}
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protected:
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void paintEvent(QPaintEvent *event) {
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QPainter p(this);
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p.fillRect(event->rect(), Qt::white);
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int start = m_offset / m_height;
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int y = start * m_height - m_offset;
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if (m_offset <= 0) {
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start = 0;
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y = -m_offset;
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}
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int end = start + height() / m_height + 1;
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if (end > m_colorNames.count() - 1)
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end = m_colorNames.count() - 1;
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for (int i = start; i <= end; ++i, y += m_height) {
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p.setBrush(Qt::NoBrush);
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p.setPen(Qt::black);
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if (i == m_highlight) {
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p.fillRect(0, y, width(), m_height, QColor(0, 64, 128));
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p.setPen(Qt::white);
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}
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if (i == m_selected) {
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p.fillRect(0, y, width(), m_height, QColor(0, 128, 240));
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p.setPen(Qt::white);
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}
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p.drawText(m_height + 2, y, width(), m_height, Qt::AlignVCenter, m_colorNames[i]);
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p.setPen(Qt::NoPen);
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p.setBrush(m_firstColor[i]);
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p.drawRect(1, y + 1, m_height - 2, m_height - 2);
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p.setBrush(m_secondColor[i]);
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p.drawRect(5, y + 5, m_height - 11, m_height - 11);
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}
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p.end();
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}
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void keyReleaseEvent(QKeyEvent *event) {
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if (event->key() == Qt::Key_Down) {
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m_offset += 20;
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event->accept();
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update();
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return;
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}
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if (event->key() == Qt::Key_Up) {
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m_offset -= 20;
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event->accept();
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update();
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return;
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}
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}
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void mousePressEvent(QMouseEvent *event) {
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Flickable::handleMousePress(event);
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if (event->isAccepted())
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return;
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if (event->button() == Qt::LeftButton) {
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int y = event->pos().y() + m_offset;
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int i = y / m_height;
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if (i != m_highlight) {
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m_highlight = i;
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m_selected = -1;
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update();
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}
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event->accept();
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}
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}
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void mouseMoveEvent(QMouseEvent *event) {
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Flickable::handleMouseMove(event);
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}
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void mouseReleaseEvent(QMouseEvent *event) {
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Flickable::handleMouseRelease(event);
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if (event->isAccepted())
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return;
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if (event->button() == Qt::LeftButton) {
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m_selected = m_highlight;
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event->accept();
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update();
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}
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}
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private:
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int m_offset;
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int m_height;
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int m_highlight;
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int m_selected;
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QStringList m_colorNames;
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QList<QColor> m_firstColor;
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QList<QColor> m_secondColor;
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};
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#include "main.moc"
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int main(int argc, char *argv[])
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{
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QApplication app(argc, argv);
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ColorList list;
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list.setWindowTitle("Kinetic Scrolling");
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#if defined(Q_OS_SYMBIAN) || defined(Q_OS_WINCE_WM)
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list.showMaximized();
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#else
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list.resize(320, 320);
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list.show();
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#endif
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return app.exec();
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}
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