C++/Qt/QWidget — различия между версиями
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Версия 17:21, 25 мая 2010
Содержание
Analog Clock
<source lang="cpp"> /****************************************************************************
- Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
- All rights reserved.
- Contact: Nokia Corporation (qt-info@nokia.com)
- This file is part of the examples of the Qt Toolkit.
- $QT_BEGIN_LICENSE:LGPL$
- Commercial Usage
- Licensees holding valid Qt Commercial licenses may use this file in
- accordance with the Qt Commercial License Agreement provided with the
- Software or, alternatively, in accordance with the terms contained in
- a written agreement between you and Nokia.
- GNU Lesser General Public License Usage
- Alternatively, this file may be used under the terms of the GNU Lesser
- General Public License version 2.1 as published by the Free Software
- Foundation and appearing in the file LICENSE.LGPL included in the
- packaging of this file. Please review the following information to
- ensure the GNU Lesser General Public License version 2.1 requirements
- will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
- In addition, as a special exception, Nokia gives you certain additional
- rights. These rights are described in the Nokia Qt LGPL Exception
- version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
- GNU General Public License Usage
- Alternatively, this file may be used under the terms of the GNU
- General Public License version 3.0 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 3.0 requirements will be
- met: http://www.gnu.org/copyleft/gpl.html.
- If you have questions regarding the use of this file, please contact
- Nokia at qt-info@nokia.com.
- $QT_END_LICENSE$
-
- /
- ifndef ANALOGCLOCK_H
- define ANALOGCLOCK_H
- include <QWidget>
class AnalogClock : public QWidget {
Q_OBJECT
public:
AnalogClock(QWidget *parent = 0);
protected:
void paintEvent(QPaintEvent *event);
};
- endif
- include <QtGui>
- include "analogclock.h"
AnalogClock::AnalogClock(QWidget *parent)
: QWidget(parent)
{
QTimer *timer = new QTimer(this); connect(timer, SIGNAL(timeout()), this, SLOT(update())); timer->start(1000);
setWindowTitle(tr("Analog Clock"));
resize(200, 200);
}
void AnalogClock::paintEvent(QPaintEvent *)
{
static const QPoint hourHand[3] = {
QPoint(7, 8),
QPoint(-7, 8),
QPoint(0, -40)
};
static const QPoint minuteHand[3] = {
QPoint(7, 8),
QPoint(-7, 8),
QPoint(0, -70)
};
QColor hourColor(127, 0, 127);
QColor minuteColor(0, 127, 127, 191);
int side = qMin(width(), height());
QTime time = QTime::currentTime();
QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing); painter.translate(width() / 2, height() / 2); painter.scale(side / 200.0, side / 200.0);
painter.setPen(Qt::NoPen); painter.setBrush(hourColor);
painter.save(); painter.rotate(30.0 * ((time.hour() + time.minute() / 60.0))); painter.drawConvexPolygon(hourHand, 3); painter.restore();
painter.setPen(hourColor);
for (int i = 0; i < 12; ++i) {
painter.drawLine(88, 0, 96, 0);
painter.rotate(30.0);
}
painter.setPen(Qt::NoPen); painter.setBrush(minuteColor);
painter.save(); painter.rotate(6.0 * (time.minute() + time.second() / 60.0)); painter.drawConvexPolygon(minuteHand, 3); painter.restore();
painter.setPen(minuteColor);
for (int j = 0; j < 60; ++j) {
if ((j % 5) != 0)
painter.drawLine(92, 0, 96, 0);
painter.rotate(6.0);
}
}
- include <QApplication>
- include "analogclock.h"
int main(int argc, char *argv[]) {
QApplication app(argc, argv); AnalogClock clock; clock.show(); return app.exec();
}
</source>
Calendar widget
<source lang="cpp"> /****************************************************************************
- Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
- All rights reserved.
- Contact: Nokia Corporation (qt-info@nokia.com)
- This file is part of the examples of the Qt Toolkit.
- $QT_BEGIN_LICENSE:LGPL$
- Commercial Usage
- Licensees holding valid Qt Commercial licenses may use this file in
- accordance with the Qt Commercial License Agreement provided with the
- Software or, alternatively, in accordance with the terms contained in
- a written agreement between you and Nokia.
- GNU Lesser General Public License Usage
- Alternatively, this file may be used under the terms of the GNU Lesser
- General Public License version 2.1 as published by the Free Software
- Foundation and appearing in the file LICENSE.LGPL included in the
- packaging of this file. Please review the following information to
- ensure the GNU Lesser General Public License version 2.1 requirements
- will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
- In addition, as a special exception, Nokia gives you certain additional
- rights. These rights are described in the Nokia Qt LGPL Exception
- version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
- GNU General Public License Usage
- Alternatively, this file may be used under the terms of the GNU
- General Public License version 3.0 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 3.0 requirements will be
- met: http://www.gnu.org/copyleft/gpl.html.
- If you have questions regarding the use of this file, please contact
- Nokia at qt-info@nokia.com.
- $QT_END_LICENSE$
-
- /
- ifndef WINDOW_H
- define WINDOW_H
- include <QWidget>
QT_BEGIN_NAMESPACE class QCalendarWidget; class QCheckBox; class QComboBox; class QDate; class QDateEdit; class QGridLayout; class QGroupBox; class QLabel; QT_END_NAMESPACE
class Window : public QWidget {
Q_OBJECT
public:
Window();
private slots:
void localeChanged(int index); void firstDayChanged(int index); void selectionModeChanged(int index); void horizontalHeaderChanged(int index); void verticalHeaderChanged(int index); void selectedDateChanged(); void minimumDateChanged(const QDate &date); void maximumDateChanged(const QDate &date); void weekdayFormatChanged(); void weekendFormatChanged(); void reformatHeaders(); void reformatCalendarPage();
private:
void createPreviewGroupBox(); void createGeneralOptionsGroupBox(); void createDatesGroupBox(); void createTextFormatsGroupBox(); QComboBox *createColorComboBox(); QGroupBox *previewGroupBox; QGridLayout *previewLayout; QCalendarWidget *calendar; QGroupBox *generalOptionsGroupBox; QLabel *localeLabel; QLabel *firstDayLabel; QLabel *selectionModeLabel; QLabel *horizontalHeaderLabel; QLabel *verticalHeaderLabel; QComboBox *localeCombo; QComboBox *firstDayCombo; QComboBox *selectionModeCombo; QCheckBox *gridCheckBox; QCheckBox *navigationCheckBox; QComboBox *horizontalHeaderCombo; QComboBox *verticalHeaderCombo; QGroupBox *datesGroupBox; QLabel *currentDateLabel; QLabel *minimumDateLabel; QLabel *maximumDateLabel; QDateEdit *currentDateEdit; QDateEdit *minimumDateEdit; QDateEdit *maximumDateEdit; QGroupBox *textFormatsGroupBox; QLabel *weekdayColorLabel; QLabel *weekendColorLabel; QLabel *headerTextFormatLabel; QComboBox *weekdayColorCombo; QComboBox *weekendColorCombo; QComboBox *headerTextFormatCombo; QCheckBox *firstFridayCheckBox; QCheckBox *mayFirstCheckBox;
};
- endif
- include <QtGui>
- include "window.h"
Window::Window() {
createPreviewGroupBox();
createGeneralOptionsGroupBox();
createDatesGroupBox();
createTextFormatsGroupBox();
QGridLayout *layout = new QGridLayout;
layout->addWidget(previewGroupBox, 0, 0);
layout->addWidget(generalOptionsGroupBox, 0, 1);
layout->addWidget(datesGroupBox, 1, 0);
layout->addWidget(textFormatsGroupBox, 1, 1);
layout->setSizeConstraint(QLayout::SetFixedSize);
setLayout(layout);
previewLayout->setRowMinimumHeight(0, calendar->sizeHint().height());
previewLayout->setColumnMinimumWidth(0, calendar->sizeHint().width());
setWindowTitle(tr("Calendar Widget"));
}
void Window::localeChanged(int index) {
calendar->setLocale(localeCombo->itemData(index).toLocale());
}
void Window::firstDayChanged(int index) {
calendar->setFirstDayOfWeek(Qt::DayOfWeek(
firstDayCombo->itemData(index).toInt()));
}
void Window::selectionModeChanged(int index) {
calendar->setSelectionMode(QCalendarWidget::SelectionMode(
selectionModeCombo->itemData(index).toInt()));
} void Window::horizontalHeaderChanged(int index) {
calendar->setHorizontalHeaderFormat(QCalendarWidget::HorizontalHeaderFormat(
horizontalHeaderCombo->itemData(index).toInt()));
} void Window::verticalHeaderChanged(int index) {
calendar->setVerticalHeaderFormat(QCalendarWidget::VerticalHeaderFormat(
verticalHeaderCombo->itemData(index).toInt()));
}
void Window::selectedDateChanged() {
currentDateEdit->setDate(calendar->selectedDate());
}
void Window::minimumDateChanged(const QDate &date) {
calendar->setMinimumDate(date); maximumDateEdit->setDate(calendar->maximumDate());
}
void Window::maximumDateChanged(const QDate &date) {
calendar->setMaximumDate(date); minimumDateEdit->setDate(calendar->minimumDate());
}
void Window::weekdayFormatChanged() {
QTextCharFormat format;
format.setForeground(qvariant_cast<QColor>(
weekdayColorCombo->itemData(weekdayColorCombo->currentIndex())));
calendar->setWeekdayTextFormat(Qt::Monday, format);
calendar->setWeekdayTextFormat(Qt::Tuesday, format);
calendar->setWeekdayTextFormat(Qt::Wednesday, format);
calendar->setWeekdayTextFormat(Qt::Thursday, format);
calendar->setWeekdayTextFormat(Qt::Friday, format);
}
void Window::weekendFormatChanged() {
QTextCharFormat format;
format.setForeground(qvariant_cast<QColor>(
weekendColorCombo->itemData(weekendColorCombo->currentIndex())));
calendar->setWeekdayTextFormat(Qt::Saturday, format);
calendar->setWeekdayTextFormat(Qt::Sunday, format);
}
void Window::reformatHeaders() {
QString text = headerTextFormatCombo->currentText();
QTextCharFormat format;
if (text == tr("Bold")) {
format.setFontWeight(QFont::Bold);
} else if (text == tr("Italic")) {
format.setFontItalic(true);
} else if (text == tr("Green")) {
format.setForeground(Qt::green);
}
calendar->setHeaderTextFormat(format);
}
void Window::reformatCalendarPage() {
QTextCharFormat mayFirstFormat;
if (mayFirstCheckBox->isChecked())
mayFirstFormat.setForeground(Qt::red);
QTextCharFormat firstFridayFormat;
if (firstFridayCheckBox->isChecked())
firstFridayFormat.setForeground(Qt::blue);
QDate date(calendar->yearShown(), calendar->monthShown(), 1);
calendar->setDateTextFormat(QDate(date.year(), 5, 1), mayFirstFormat);
date.setDate(date.year(), date.month(), 1);
while (date.dayOfWeek() != Qt::Friday)
date = date.addDays(1);
calendar->setDateTextFormat(date, firstFridayFormat);
}
void Window::createPreviewGroupBox() {
previewGroupBox = new QGroupBox(tr("Preview"));
calendar = new QCalendarWidget;
calendar->setMinimumDate(QDate(1900, 1, 1));
calendar->setMaximumDate(QDate(3000, 1, 1));
calendar->setGridVisible(true);
connect(calendar, SIGNAL(currentPageChanged(int, int)),
this, SLOT(reformatCalendarPage()));
previewLayout = new QGridLayout;
previewLayout->addWidget(calendar, 0, 0, Qt::AlignCenter);
previewGroupBox->setLayout(previewLayout);
}
void Window::createGeneralOptionsGroupBox() {
generalOptionsGroupBox = new QGroupBox(tr("General Options"));
localeCombo = new QComboBox;
int curLocaleIndex = -1;
int index = 0;
for (int _lang = QLocale::C; _lang <= QLocale::LastLanguage; ++_lang) {
QLocale::Language lang = static_cast<QLocale::Language>(_lang);
QList<QLocale::Country> countries = QLocale::countriesForLanguage(lang);
for (int i = 0; i < countries.count(); ++i) {
QLocale::Country country = countries.at(i);
QString label = QLocale::languageToString(lang);
label += QLatin1Char("/");
label += QLocale::countryToString(country);
QLocale locale(lang, country);
if (this->locale().language() == lang && this->locale().country() == country)
curLocaleIndex = index;
localeCombo->addItem(label, locale);
++index;
}
}
if (curLocaleIndex != -1)
localeCombo->setCurrentIndex(curLocaleIndex);
localeLabel = new QLabel(tr("&Locale"));
localeLabel->setBuddy(localeCombo);
firstDayCombo = new QComboBox;
firstDayCombo->addItem(tr("Sunday"), Qt::Sunday);
firstDayCombo->addItem(tr("Monday"), Qt::Monday);
firstDayCombo->addItem(tr("Tuesday"), Qt::Tuesday);
firstDayCombo->addItem(tr("Wednesday"), Qt::Wednesday);
firstDayCombo->addItem(tr("Thursday"), Qt::Thursday);
firstDayCombo->addItem(tr("Friday"), Qt::Friday);
firstDayCombo->addItem(tr("Saturday"), Qt::Saturday);
firstDayLabel = new QLabel(tr("Wee&k starts on:"));
firstDayLabel->setBuddy(firstDayCombo);
selectionModeCombo = new QComboBox;
selectionModeCombo->addItem(tr("Single selection"),
QCalendarWidget::SingleSelection);
selectionModeCombo->addItem(tr("None"), QCalendarWidget::NoSelection);
selectionModeLabel = new QLabel(tr("&Selection mode:"));
selectionModeLabel->setBuddy(selectionModeCombo);
gridCheckBox = new QCheckBox(tr("&Grid"));
gridCheckBox->setChecked(calendar->isGridVisible());
navigationCheckBox = new QCheckBox(tr("&Navigation bar"));
navigationCheckBox->setChecked(true);
horizontalHeaderCombo = new QComboBox;
horizontalHeaderCombo->addItem(tr("Single letter day names"),
QCalendarWidget::SingleLetterDayNames);
horizontalHeaderCombo->addItem(tr("Short day names"),
QCalendarWidget::ShortDayNames);
horizontalHeaderCombo->addItem(tr("None"),
QCalendarWidget::NoHorizontalHeader);
horizontalHeaderCombo->setCurrentIndex(1);
horizontalHeaderLabel = new QLabel(tr("&Horizontal header:"));
horizontalHeaderLabel->setBuddy(horizontalHeaderCombo);
verticalHeaderCombo = new QComboBox;
verticalHeaderCombo->addItem(tr("ISO week numbers"),
QCalendarWidget::ISOWeekNumbers);
verticalHeaderCombo->addItem(tr("None"), QCalendarWidget::NoVerticalHeader);
verticalHeaderLabel = new QLabel(tr("&Vertical header:"));
verticalHeaderLabel->setBuddy(verticalHeaderCombo);
connect(localeCombo, SIGNAL(currentIndexChanged(int)),
this, SLOT(localeChanged(int)));
connect(firstDayCombo, SIGNAL(currentIndexChanged(int)),
this, SLOT(firstDayChanged(int)));
connect(selectionModeCombo, SIGNAL(currentIndexChanged(int)),
this, SLOT(selectionModeChanged(int)));
connect(gridCheckBox, SIGNAL(toggled(bool)),
calendar, SLOT(setGridVisible(bool)));
connect(navigationCheckBox, SIGNAL(toggled(bool)),
calendar, SLOT(setNavigationBarVisible(bool)));
connect(horizontalHeaderCombo, SIGNAL(currentIndexChanged(int)),
this, SLOT(horizontalHeaderChanged(int)));
connect(verticalHeaderCombo, SIGNAL(currentIndexChanged(int)),
this, SLOT(verticalHeaderChanged(int)));
QHBoxLayout *checkBoxLayout = new QHBoxLayout; checkBoxLayout->addWidget(gridCheckBox); checkBoxLayout->addStretch(); checkBoxLayout->addWidget(navigationCheckBox); QGridLayout *outerLayout = new QGridLayout; outerLayout->addWidget(localeLabel, 0, 0); outerLayout->addWidget(localeCombo, 0, 1); outerLayout->addWidget(firstDayLabel, 1, 0); outerLayout->addWidget(firstDayCombo, 1, 1); outerLayout->addWidget(selectionModeLabel, 2, 0); outerLayout->addWidget(selectionModeCombo, 2, 1); outerLayout->addLayout(checkBoxLayout, 3, 0, 1, 2); outerLayout->addWidget(horizontalHeaderLabel, 4, 0); outerLayout->addWidget(horizontalHeaderCombo, 4, 1); outerLayout->addWidget(verticalHeaderLabel, 5, 0); outerLayout->addWidget(verticalHeaderCombo, 5, 1); generalOptionsGroupBox->setLayout(outerLayout);
firstDayChanged(firstDayCombo->currentIndex()); selectionModeChanged(selectionModeCombo->currentIndex()); horizontalHeaderChanged(horizontalHeaderCombo->currentIndex()); verticalHeaderChanged(verticalHeaderCombo->currentIndex());
}
void Window::createDatesGroupBox() {
datesGroupBox = new QGroupBox(tr("Dates"));
minimumDateEdit = new QDateEdit;
minimumDateEdit->setDisplayFormat("MMM d yyyy");
minimumDateEdit->setDateRange(calendar->minimumDate(),
calendar->maximumDate());
minimumDateEdit->setDate(calendar->minimumDate());
minimumDateLabel = new QLabel(tr("&Minimum Date:"));
minimumDateLabel->setBuddy(minimumDateEdit);
currentDateEdit = new QDateEdit;
currentDateEdit->setDisplayFormat("MMM d yyyy");
currentDateEdit->setDate(calendar->selectedDate());
currentDateEdit->setDateRange(calendar->minimumDate(),
calendar->maximumDate());
currentDateLabel = new QLabel(tr("&Current Date:"));
currentDateLabel->setBuddy(currentDateEdit);
maximumDateEdit = new QDateEdit;
maximumDateEdit->setDisplayFormat("MMM d yyyy");
maximumDateEdit->setDateRange(calendar->minimumDate(),
calendar->maximumDate());
maximumDateEdit->setDate(calendar->maximumDate());
maximumDateLabel = new QLabel(tr("Ma&ximum Date:"));
maximumDateLabel->setBuddy(maximumDateEdit);
connect(currentDateEdit, SIGNAL(dateChanged(const QDate &)),
calendar, SLOT(setSelectedDate(const QDate &)));
connect(calendar, SIGNAL(selectionChanged()),
this, SLOT(selectedDateChanged()));
connect(minimumDateEdit, SIGNAL(dateChanged(const QDate &)),
this, SLOT(minimumDateChanged(const QDate &)));
connect(maximumDateEdit, SIGNAL(dateChanged(const QDate &)),
this, SLOT(maximumDateChanged(const QDate &)));
QGridLayout *dateBoxLayout = new QGridLayout; dateBoxLayout->addWidget(currentDateLabel, 1, 0); dateBoxLayout->addWidget(currentDateEdit, 1, 1); dateBoxLayout->addWidget(minimumDateLabel, 0, 0); dateBoxLayout->addWidget(minimumDateEdit, 0, 1); dateBoxLayout->addWidget(maximumDateLabel, 2, 0); dateBoxLayout->addWidget(maximumDateEdit, 2, 1); dateBoxLayout->setRowStretch(3, 1); datesGroupBox->setLayout(dateBoxLayout);
}
void Window::createTextFormatsGroupBox() {
textFormatsGroupBox = new QGroupBox(tr("Text Formats"));
weekdayColorCombo = createColorComboBox();
weekdayColorCombo->setCurrentIndex(
weekdayColorCombo->findText(tr("Black")));
weekdayColorLabel = new QLabel(tr("&Weekday color:"));
weekdayColorLabel->setBuddy(weekdayColorCombo);
weekendColorCombo = createColorComboBox();
weekendColorCombo->setCurrentIndex(
weekendColorCombo->findText(tr("Red")));
weekendColorLabel = new QLabel(tr("Week&end color:"));
weekendColorLabel->setBuddy(weekendColorCombo);
headerTextFormatCombo = new QComboBox;
headerTextFormatCombo->addItem(tr("Bold"));
headerTextFormatCombo->addItem(tr("Italic"));
headerTextFormatCombo->addItem(tr("Plain"));
headerTextFormatLabel = new QLabel(tr("&Header text:"));
headerTextFormatLabel->setBuddy(headerTextFormatCombo);
firstFridayCheckBox = new QCheckBox(tr("&First Friday in blue"));
mayFirstCheckBox = new QCheckBox(tr("May &1 in red"));
connect(weekdayColorCombo, SIGNAL(currentIndexChanged(int)),
this, SLOT(weekdayFormatChanged()));
connect(weekendColorCombo, SIGNAL(currentIndexChanged(int)),
this, SLOT(weekendFormatChanged()));
connect(headerTextFormatCombo, SIGNAL(currentIndexChanged(const QString &)),
this, SLOT(reformatHeaders()));
connect(firstFridayCheckBox, SIGNAL(toggled(bool)),
this, SLOT(reformatCalendarPage()));
connect(mayFirstCheckBox, SIGNAL(toggled(bool)),
this, SLOT(reformatCalendarPage()));
QHBoxLayout *checkBoxLayout = new QHBoxLayout; checkBoxLayout->addWidget(firstFridayCheckBox); checkBoxLayout->addStretch(); checkBoxLayout->addWidget(mayFirstCheckBox); QGridLayout *outerLayout = new QGridLayout; outerLayout->addWidget(weekdayColorLabel, 0, 0); outerLayout->addWidget(weekdayColorCombo, 0, 1); outerLayout->addWidget(weekendColorLabel, 1, 0); outerLayout->addWidget(weekendColorCombo, 1, 1); outerLayout->addWidget(headerTextFormatLabel, 2, 0); outerLayout->addWidget(headerTextFormatCombo, 2, 1); outerLayout->addLayout(checkBoxLayout, 3, 0, 1, 2); textFormatsGroupBox->setLayout(outerLayout); weekdayFormatChanged(); weekendFormatChanged(); reformatHeaders(); reformatCalendarPage();
}
QComboBox *Window::createColorComboBox() {
QComboBox *comboBox = new QComboBox;
comboBox->addItem(tr("Red"), Qt::red);
comboBox->addItem(tr("Blue"), Qt::blue);
comboBox->addItem(tr("Black"), Qt::black);
comboBox->addItem(tr("Magenta"), Qt::magenta);
return comboBox;
}
- include <QtGui>
- include "window.h"
int main(int argv, char *args[]) {
QApplication app(argv, args); Window window; window.show(); return app.exec();
}
</source>
Child widget
<source lang="cpp"> /****************************************************************************
- Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
- All rights reserved.
- Contact: Nokia Corporation (qt-info@nokia.com)
- This file is part of the documentation of the Qt Toolkit.
- $QT_BEGIN_LICENSE:LGPL$
- Commercial Usage
- Licensees holding valid Qt Commercial licenses may use this file in
- accordance with the Qt Commercial License Agreement provided with the
- Software or, alternatively, in accordance with the terms contained in
- a written agreement between you and Nokia.
- GNU Lesser General Public License Usage
- Alternatively, this file may be used under the terms of the GNU Lesser
- General Public License version 2.1 as published by the Free Software
- Foundation and appearing in the file LICENSE.LGPL included in the
- packaging of this file. Please review the following information to
- ensure the GNU Lesser General Public License version 2.1 requirements
- will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
- In addition, as a special exception, Nokia gives you certain additional
- rights. These rights are described in the Nokia Qt LGPL Exception
- version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
- GNU General Public License Usage
- Alternatively, this file may be used under the terms of the GNU
- General Public License version 3.0 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 3.0 requirements will be
- met: http://www.gnu.org/copyleft/gpl.html.
- If you have questions regarding the use of this file, please contact
- Nokia at qt-info@nokia.com.
- $QT_END_LICENSE$
-
- /
- include <QtGui>
int main(int argc, char *argv[]) {
QApplication app(argc, argv);
QWidget *window = new QWidget();
window->resize(320, 240);
window->setWindowTitle(tr("Child widget"));
window->show();
//! [create, position and show]
QPushButton *button = new QPushButton(tr("Press me"), window);
button->move(100, 100);
button->show();
//! [create, position and show]
return app.exec();
}
</source>
Circle Widget
<source lang="cpp"> /****************************************************************************
- Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
- All rights reserved.
- Contact: Nokia Corporation (qt-info@nokia.com)
- This file is part of the examples of the Qt Toolkit.
- $QT_BEGIN_LICENSE:LGPL$
- Commercial Usage
- Licensees holding valid Qt Commercial licenses may use this file in
- accordance with the Qt Commercial License Agreement provided with the
- Software or, alternatively, in accordance with the terms contained in
- a written agreement between you and Nokia.
- GNU Lesser General Public License Usage
- Alternatively, this file may be used under the terms of the GNU Lesser
- General Public License version 2.1 as published by the Free Software
- Foundation and appearing in the file LICENSE.LGPL included in the
- packaging of this file. Please review the following information to
- ensure the GNU Lesser General Public License version 2.1 requirements
- will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
- In addition, as a special exception, Nokia gives you certain additional
- rights. These rights are described in the Nokia Qt LGPL Exception
- version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
- GNU General Public License Usage
- Alternatively, this file may be used under the terms of the GNU
- General Public License version 3.0 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 3.0 requirements will be
- met: http://www.gnu.org/copyleft/gpl.html.
- If you have questions regarding the use of this file, please contact
- Nokia at qt-info@nokia.com.
- $QT_END_LICENSE$
-
- /
- ifndef CIRCLEWIDGET_H
- define CIRCLEWIDGET_H
- include <QWidget>
class CircleWidget : public QWidget {
Q_OBJECT
public:
CircleWidget(QWidget *parent = 0); void setFloatBased(bool floatBased); void setAntialiased(bool antialiased); QSize minimumSizeHint() const; QSize sizeHint() const;
public slots:
void nextAnimationFrame();
protected:
void paintEvent(QPaintEvent *event);
private:
bool floatBased; bool antialiased; int frameNo;
};
- endif
- include <QtGui>
- include "circlewidget.h"
- include <stdlib.h>
CircleWidget::CircleWidget(QWidget *parent)
: QWidget(parent)
{
floatBased = false; antialiased = false; frameNo = 0; setBackgroundRole(QPalette::Base); setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
}
void CircleWidget::setFloatBased(bool floatBased) {
this->floatBased = floatBased; update();
}
void CircleWidget::setAntialiased(bool antialiased) {
this->antialiased = antialiased; update();
}
QSize CircleWidget::minimumSizeHint() const {
return QSize(50, 50);
}
QSize CircleWidget::sizeHint() const {
return QSize(180, 180);
}
void CircleWidget::nextAnimationFrame() {
++frameNo; update();
}
void CircleWidget::paintEvent(QPaintEvent *) {
QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing, antialiased); painter.translate(width() / 2, height() / 2);
for (int diameter = 0; diameter < 256; diameter += 9) {
int delta = abs((frameNo % 128) - diameter / 2);
int alpha = 255 - (delta * delta) / 4 - diameter;
if (alpha > 0) {
painter.setPen(QPen(QColor(0, diameter / 2, 127, alpha), 3));
if (floatBased) {
painter.drawEllipse(QRectF(-diameter / 2.0, -diameter / 2.0,
diameter, diameter));
} else {
painter.drawEllipse(QRect(-diameter / 2, -diameter / 2,
diameter, diameter));
}
}
}
}
- ifndef WINDOW_H
- define WINDOW_H
- include <QWidget>
QT_BEGIN_NAMESPACE class QLabel; QT_END_NAMESPACE class CircleWidget;
class Window : public QWidget {
Q_OBJECT
public:
Window();
private:
QLabel *createLabel(const QString &text); QLabel *aliasedLabel; QLabel *antialiasedLabel; QLabel *intLabel; QLabel *floatLabel; CircleWidget *circleWidgets[2][2];
};
- endif
- include <QtGui>
- include "circlewidget.h"
- include "window.h"
Window::Window() {
aliasedLabel = createLabel(tr("Aliased"));
antialiasedLabel = createLabel(tr("Antialiased"));
intLabel = createLabel(tr("Int"));
floatLabel = createLabel(tr("Float"));
QGridLayout *layout = new QGridLayout;
layout->addWidget(aliasedLabel, 0, 1);
layout->addWidget(antialiasedLabel, 0, 2);
layout->addWidget(intLabel, 1, 0);
layout->addWidget(floatLabel, 2, 0);
QTimer *timer = new QTimer(this);
for (int i = 0; i < 2; ++i) {
for (int j = 0; j < 2; ++j) {
circleWidgets[i][j] = new CircleWidget;
circleWidgets[i][j]->setAntialiased(j != 0);
circleWidgets[i][j]->setFloatBased(i != 0);
connect(timer, SIGNAL(timeout()),
circleWidgets[i][j], SLOT(nextAnimationFrame()));
layout->addWidget(circleWidgets[i][j], i + 1, j + 1);
}
}
timer->start(100);
setLayout(layout);
setWindowTitle(tr("Concentric Circles"));
}
QLabel *Window::createLabel(const QString &text) {
QLabel *label = new QLabel(text); label->setAlignment(Qt::AlignCenter); label->setMargin(2); label->setFrameStyle(QFrame::Box | QFrame::Sunken); return label;
}
- include <QApplication>
- include "window.h"
int main(int argc, char *argv[]) {
QApplication app(argc, argv); Window window; window.show(); return app.exec();
}
</source>
Combo widget mapper
<source lang="cpp"> /****************************************************************************
- Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
- All rights reserved.
- Contact: Nokia Corporation (qt-info@nokia.com)
- This file is part of the examples of the Qt Toolkit.
- $QT_BEGIN_LICENSE:LGPL$
- Commercial Usage
- Licensees holding valid Qt Commercial licenses may use this file in
- accordance with the Qt Commercial License Agreement provided with the
- Software or, alternatively, in accordance with the terms contained in
- a written agreement between you and Nokia.
- GNU Lesser General Public License Usage
- Alternatively, this file may be used under the terms of the GNU Lesser
- General Public License version 2.1 as published by the Free Software
- Foundation and appearing in the file LICENSE.LGPL included in the
- packaging of this file. Please review the following information to
- ensure the GNU Lesser General Public License version 2.1 requirements
- will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
- In addition, as a special exception, Nokia gives you certain additional
- rights. These rights are described in the Nokia Qt LGPL Exception
- version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
- GNU General Public License Usage
- Alternatively, this file may be used under the terms of the GNU
- General Public License version 3.0 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 3.0 requirements will be
- met: http://www.gnu.org/copyleft/gpl.html.
- If you have questions regarding the use of this file, please contact
- Nokia at qt-info@nokia.com.
- $QT_END_LICENSE$
-
- /
- ifndef WINDOW_H
- define WINDOW_H
- include <QWidget>
QT_BEGIN_NAMESPACE class QComboBox; class QDataWidgetMapper; class QLabel; class QLineEdit; class QPushButton; class QStandardItemModel; class QStringListModel; class QTextEdit; QT_END_NAMESPACE //! [Window definition] class Window : public QWidget {
Q_OBJECT
public:
Window(QWidget *parent = 0);
private slots:
void updateButtons(int row);
private:
void setupModel(); QLabel *nameLabel; QLabel *addressLabel; QLabel *typeLabel; QLineEdit *nameEdit; QTextEdit *addressEdit; QComboBox *typeComboBox; QPushButton *nextButton; QPushButton *previousButton; QStandardItemModel *model; QStringListModel *typeModel; QDataWidgetMapper *mapper;
}; //! [Window definition]
- endif
- include <QtGui>
- include "window.h"
//! [Set up widgets] Window::Window(QWidget *parent)
: QWidget(parent)
{
setupModel();
nameLabel = new QLabel(tr("Na&me:"));
nameEdit = new QLineEdit();
addressLabel = new QLabel(tr("&Address:"));
addressEdit = new QTextEdit();
typeLabel = new QLabel(tr("&Type:"));
typeComboBox = new QComboBox();
nextButton = new QPushButton(tr("&Next"));
previousButton = new QPushButton(tr("&Previous"));
nameLabel->setBuddy(nameEdit);
addressLabel->setBuddy(addressEdit);
typeLabel->setBuddy(typeComboBox);
typeComboBox->setModel(typeModel);
//! [Set up widgets] //! [Set up the mapper]
mapper = new QDataWidgetMapper(this); mapper->setModel(model); mapper->addMapping(nameEdit, 0); mapper->addMapping(addressEdit, 1); mapper->addMapping(typeComboBox, 2, "currentIndex");
//! [Set up the mapper] //! [Set up connections and layouts]
connect(previousButton, SIGNAL(clicked()),
mapper, SLOT(toPrevious()));
connect(nextButton, SIGNAL(clicked()),
mapper, SLOT(toNext()));
connect(mapper, SIGNAL(currentIndexChanged(int)),
this, SLOT(updateButtons(int)));
QGridLayout *layout = new QGridLayout();
layout->addWidget(nameLabel, 0, 0, 1, 1);
layout->addWidget(nameEdit, 0, 1, 1, 1);
layout->addWidget(previousButton, 0, 2, 1, 1);
layout->addWidget(addressLabel, 1, 0, 1, 1);
layout->addWidget(addressEdit, 1, 1, 2, 1);
layout->addWidget(nextButton, 1, 2, 1, 1);
layout->addWidget(typeLabel, 3, 0, 1, 1);
layout->addWidget(typeComboBox, 3, 1, 1, 1);
setLayout(layout);
setWindowTitle(tr("Delegate Widget Mapper"));
mapper->toFirst();
} //! [Set up connections and layouts] //! [Set up the model] void Window::setupModel() {
QStringList items;
items << tr("Home") << tr("Work") << tr("Other");
typeModel = new QStringListModel(items, this);
model = new QStandardItemModel(5, 3, this);
QStringList names;
names << "Alice" << "Bob" << "Carol" << "Donald" << "Emma";
QStringList addresses;
addresses << "<qt>123 Main Street
Market Town</qt>"
<< "<qt>PO Box 32
Mail Handling Service"
"
Service City</qt>"
<< "<qt>The Lighthouse
Remote Island</qt>"
<< "<qt>47338 Park Avenue
Big City</qt>"
<< "<qt>Research Station
Base Camp
Big Mountain</qt>";
QStringList types;
types << "0" << "1" << "2" << "0" << "2";
for (int row = 0; row < 5; ++row) {
QStandardItem *item = new QStandardItem(names[row]);
model->setItem(row, 0, item);
item = new QStandardItem(addresses[row]);
model->setItem(row, 1, item);
item = new QStandardItem(types[row]);
model->setItem(row, 2, item);
}
} //! [Set up the model] //! [Slot for updating the buttons] void Window::updateButtons(int row) {
previousButton->setEnabled(row > 0); nextButton->setEnabled(row < model->rowCount() - 1);
} //! [Slot for updating the buttons]
- include <QApplication>
- include "window.h"
int main(int argc, char **argv) {
QApplication app(argc, argv); Window window; window.show(); return app.exec();
}
</source>
extends QWidget
<source lang="cpp"> Foundations of Qt Development\Chapter06\circlebar\circlebar.cpp /*
* Copyright (c) 2006-2007, Johan Thelin * * All rights reserved. * * 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 APress 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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */
- include <QPaintEvent>
- include <QWheelEvent>
- include <QPainter>
- include "circlebar.h"
CircleBar::CircleBar( int value, QWidget *parent ) : QWidget( parent ) {
m_value = value; QSizePolicy policy( QSizePolicy::Preferred, QSizePolicy::Preferred ); policy.setHeightForWidth( true ); setSizePolicy( policy );
} int CircleBar::heightForWidth( int width ) const {
return width;
} QSize CircleBar::sizeHint() const {
return QSize( 100, 100 );
} int CircleBar::value() const {
return m_value;
} void CircleBar::setValue( int value ) {
if( value < 0 ) value = 0; if( value > 100 ) value = 100; if( m_value == value ) return; m_value = value; update(); emit valueChanged( m_value );
} void CircleBar::paintEvent( QPaintEvent *event ) {
int radius = width()/2; double factor = m_value/100.0; QPainter p( this ); p.setPen( Qt::black ); p.drawEllipse( 0, 0, width()-1, width()-1 ); p.setBrush( Qt::black ); p.drawEllipse( int(radius*(1.0-factor)), int(radius*(1.0-factor)), int((width()-1)*factor)+1, int((width()-1)*factor)+1 );
} void CircleBar::wheelEvent( QWheelEvent *event ) {
event->accept(); setValue( value() + event->delta()/20 );
}
Foundations of Qt Development\Chapter06\circlebar\circlebar.h /*
* Copyright (c) 2006-2007, Johan Thelin * * All rights reserved. * * 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 APress 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. * */
- ifndef CIRCLEBAR_H
- define CIRCLEBAR_H
- include <QWidget>
class CircleBar : public QWidget {
Q_OBJECT
public:
CircleBar( int value = 0, QWidget *parent = 0 ); int value() const; int heightForWidth( int ) const; QSize sizeHint() const;
public slots:
void setValue( int );
signals:
void valueChanged( int );
protected:
void paintEvent( QPaintEvent* ); void wheelEvent( QWheelEvent* );
private:
int m_value;
};
- endif // CIRCLEBAR_H
Foundations of Qt Development\Chapter06\circlebar\main.cpp /*
* Copyright (c) 2006-2007, Johan Thelin * * All rights reserved. * * 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 * * Neither the name of APress 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. * */
- include <QApplication>
- include <QSlider>
- include <QVBoxLayout>
- include "circlebar.h"
int main( int argc, char **argv ) {
QApplication app( argc, argv ); QWidget base; QVBoxLayout layout( &base ); CircleBar bar; QSlider slider( Qt::Horizontal ); layout.addWidget( &bar ); layout.addWidget( &slider ); QObject::connect( &slider, SIGNAL(valueChanged(int)), &bar, SLOT(setValue(int)) ); QObject::connect( &bar, SIGNAL(valueChanged(int)), &slider, SLOT(setValue(int)) ); base.show(); return app.exec();
}
</source>
How to compile and run Qt from command line
<source lang="cpp"> qmake layouts.pro C:\Qt\2009.04\qt\doc\src\snippets\layouts\debug>C:\Qt\2009.04\mingw\bin\mingw32-make go to debug folder and run the exe file
</source>
Render Area
<source lang="cpp">
/****************************************************************************
- Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
- All rights reserved.
- Contact: Nokia Corporation (qt-info@nokia.com)
- This file is part of the examples of the Qt Toolkit.
- $QT_BEGIN_LICENSE:LGPL$
- Commercial Usage
- Licensees holding valid Qt Commercial licenses may use this file in
- accordance with the Qt Commercial License Agreement provided with the
- Software or, alternatively, in accordance with the terms contained in
- a written agreement between you and Nokia.
- GNU Lesser General Public License Usage
- Alternatively, this file may be used under the terms of the GNU Lesser
- General Public License version 2.1 as published by the Free Software
- Foundation and appearing in the file LICENSE.LGPL included in the
- packaging of this file. Please review the following information to
- ensure the GNU Lesser General Public License version 2.1 requirements
- will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
- In addition, as a special exception, Nokia gives you certain additional
- rights. These rights are described in the Nokia Qt LGPL Exception
- version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
- GNU General Public License Usage
- Alternatively, this file may be used under the terms of the GNU
- General Public License version 3.0 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 3.0 requirements will be
- met: http://www.gnu.org/copyleft/gpl.html.
- If you have questions regarding the use of this file, please contact
- Nokia at qt-info@nokia.com.
- $QT_END_LICENSE$
-
- /
- ifndef RENDERAREA_H
- define RENDERAREA_H
- include <QPainterPath>
- include <QWidget>
class RenderArea : public QWidget {
Q_OBJECT
public:
RenderArea(const QPainterPath &path, QWidget *parent = 0); QSize minimumSizeHint() const; QSize sizeHint() const;
public slots:
void setFillRule(Qt::FillRule rule); void setFillGradient(const QColor &color1, const QColor &color2); void setPenWidth(int width); void setPenColor(const QColor &color); void setRotationAngle(int degrees);
protected:
void paintEvent(QPaintEvent *event);
private:
QPainterPath path; QColor fillColor1; QColor fillColor2; int penWidth; QColor penColor; int rotationAngle;
};
- endif
- include <QtGui>
- include "renderarea.h"
RenderArea::RenderArea(const QPainterPath &path, QWidget *parent)
: QWidget(parent), path(path)
{
penWidth = 1; rotationAngle = 0; setBackgroundRole(QPalette::Base);
}
QSize RenderArea::minimumSizeHint() const {
return QSize(50, 50);
}
QSize RenderArea::sizeHint() const {
return QSize(100, 100);
}
void RenderArea::setFillRule(Qt::FillRule rule) {
path.setFillRule(rule); update();
}
void RenderArea::setFillGradient(const QColor &color1, const QColor &color2) {
fillColor1 = color1; fillColor2 = color2; update();
}
void RenderArea::setPenWidth(int width) {
penWidth = width; update();
}
void RenderArea::setPenColor(const QColor &color) {
penColor = color; update();
}
void RenderArea::setRotationAngle(int degrees) {
rotationAngle = degrees; update();
}
void RenderArea::paintEvent(QPaintEvent *) {
QPainter painter(this);
painter.setRenderHint(QPainter::Antialiasing);
painter.scale(width() / 100.0, height() / 100.0);
painter.translate(50.0, 50.0);
painter.rotate(-rotationAngle);
painter.translate(-50.0, -50.0);
painter.setPen(QPen(penColor, penWidth, Qt::SolidLine, Qt::RoundCap,
Qt::RoundJoin));
QLinearGradient gradient(0, 0, 0, 100);
gradient.setColorAt(0.0, fillColor1);
gradient.setColorAt(1.0, fillColor2);
painter.setBrush(gradient);
painter.drawPath(path);
}
- ifndef WINDOW_H
- define WINDOW_H
- include <QWidget>
QT_BEGIN_NAMESPACE class QComboBox; class QLabel; class QSpinBox; QT_END_NAMESPACE class RenderArea;
class Window : public QWidget {
Q_OBJECT
public:
Window();
private slots:
void fillRuleChanged(); void fillGradientChanged(); void penColorChanged();
private:
void populateWithColors(QComboBox *comboBox); QVariant currentItemData(QComboBox *comboBox);
enum { NumRenderAreas = 9 };
RenderArea *renderAreas[NumRenderAreas];
QLabel *fillRuleLabel;
QLabel *fillGradientLabel;
QLabel *fillToLabel;
QLabel *penWidthLabel;
QLabel *penColorLabel;
QLabel *rotationAngleLabel;
QComboBox *fillRuleComboBox;
QComboBox *fillColor1ComboBox;
QComboBox *fillColor2ComboBox;
QSpinBox *penWidthSpinBox;
QComboBox *penColorComboBox;
QSpinBox *rotationAngleSpinBox;
};
- endif
- include <QtGui>
- include <math.h>
- include "renderarea.h"
- include "window.h"
const float Pi = 3.14159f;
Window::Window() {
QPainterPath rectPath; rectPath.moveTo(20.0, 30.0); rectPath.lineTo(80.0, 30.0); rectPath.lineTo(80.0, 70.0); rectPath.lineTo(20.0, 70.0); rectPath.closeSubpath();
QPainterPath roundRectPath; roundRectPath.moveTo(80.0, 35.0); roundRectPath.arcTo(70.0, 30.0, 10.0, 10.0, 0.0, 90.0); roundRectPath.lineTo(25.0, 30.0); roundRectPath.arcTo(20.0, 30.0, 10.0, 10.0, 90.0, 90.0); roundRectPath.lineTo(20.0, 65.0); roundRectPath.arcTo(20.0, 60.0, 10.0, 10.0, 180.0, 90.0); roundRectPath.lineTo(75.0, 70.0); roundRectPath.arcTo(70.0, 60.0, 10.0, 10.0, 270.0, 90.0); roundRectPath.closeSubpath();
QPainterPath ellipsePath; ellipsePath.moveTo(80.0, 50.0); ellipsePath.arcTo(20.0, 30.0, 60.0, 40.0, 0.0, 360.0);
QPainterPath piePath; piePath.moveTo(50.0, 50.0); piePath.arcTo(20.0, 30.0, 60.0, 40.0, 60.0, 240.0); piePath.closeSubpath();
QPainterPath polygonPath; polygonPath.moveTo(10.0, 80.0); polygonPath.lineTo(20.0, 10.0); polygonPath.lineTo(80.0, 30.0); polygonPath.lineTo(90.0, 70.0); polygonPath.closeSubpath();
QPainterPath groupPath; groupPath.moveTo(60.0, 40.0); groupPath.arcTo(20.0, 20.0, 40.0, 40.0, 0.0, 360.0); groupPath.moveTo(40.0, 40.0); groupPath.lineTo(40.0, 80.0); groupPath.lineTo(80.0, 80.0); groupPath.lineTo(80.0, 40.0); groupPath.closeSubpath();
QPainterPath textPath;
QFont timesFont("Times", 50);
timesFont.setStyleStrategy(QFont::ForceOutline);
textPath.addText(10, 70, timesFont, tr("Qt"));
QPainterPath bezierPath; bezierPath.moveTo(20, 30); bezierPath.cubicTo(80, 0, 50, 50, 80, 80);
QPainterPath starPath;
starPath.moveTo(90, 50);
for (int i = 1; i < 5; ++i) {
starPath.lineTo(50 + 40 * cos(0.8 * i * Pi),
50 + 40 * sin(0.8 * i * Pi));
}
starPath.closeSubpath();
renderAreas[0] = new RenderArea(rectPath); renderAreas[1] = new RenderArea(roundRectPath); renderAreas[2] = new RenderArea(ellipsePath); renderAreas[3] = new RenderArea(piePath); renderAreas[4] = new RenderArea(polygonPath); renderAreas[5] = new RenderArea(groupPath); renderAreas[6] = new RenderArea(textPath); renderAreas[7] = new RenderArea(bezierPath); renderAreas[8] = new RenderArea(starPath); Q_ASSERT(NumRenderAreas == 9);
fillRuleComboBox = new QComboBox;
fillRuleComboBox->addItem(tr("Odd Even"), Qt::OddEvenFill);
fillRuleComboBox->addItem(tr("Winding"), Qt::WindingFill);
fillRuleLabel = new QLabel(tr("Fill &Rule:"));
fillRuleLabel->setBuddy(fillRuleComboBox);
fillColor1ComboBox = new QComboBox;
populateWithColors(fillColor1ComboBox);
fillColor1ComboBox->setCurrentIndex(
fillColor1ComboBox->findText("mediumslateblue"));
fillColor2ComboBox = new QComboBox;
populateWithColors(fillColor2ComboBox);
fillColor2ComboBox->setCurrentIndex(
fillColor2ComboBox->findText("cornsilk"));
fillGradientLabel = new QLabel(tr("&Fill Gradient:"));
fillGradientLabel->setBuddy(fillColor1ComboBox);
fillToLabel = new QLabel(tr("to"));
fillToLabel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
penWidthSpinBox = new QSpinBox;
penWidthSpinBox->setRange(0, 20);
penWidthLabel = new QLabel(tr("&Pen Width:"));
penWidthLabel->setBuddy(penWidthSpinBox);
penColorComboBox = new QComboBox;
populateWithColors(penColorComboBox);
penColorComboBox->setCurrentIndex(
penColorComboBox->findText("darkslateblue"));
penColorLabel = new QLabel(tr("Pen &Color:"));
penColorLabel->setBuddy(penColorComboBox);
rotationAngleSpinBox = new QSpinBox;
rotationAngleSpinBox->setRange(0, 359);
rotationAngleSpinBox->setWrapping(true);
rotationAngleSpinBox->setSuffix("\xB0");
rotationAngleLabel = new QLabel(tr("&Rotation Angle:"));
rotationAngleLabel->setBuddy(rotationAngleSpinBox);
connect(fillRuleComboBox, SIGNAL(activated(int)),
this, SLOT(fillRuleChanged()));
connect(fillColor1ComboBox, SIGNAL(activated(int)),
this, SLOT(fillGradientChanged()));
connect(fillColor2ComboBox, SIGNAL(activated(int)),
this, SLOT(fillGradientChanged()));
connect(penColorComboBox, SIGNAL(activated(int)),
this, SLOT(penColorChanged()));
for (int i = 0; i < NumRenderAreas; ++i) {
connect(penWidthSpinBox, SIGNAL(valueChanged(int)),
renderAreas[i], SLOT(setPenWidth(int)));
connect(rotationAngleSpinBox, SIGNAL(valueChanged(int)),
renderAreas[i], SLOT(setRotationAngle(int)));
}
QGridLayout *topLayout = new QGridLayout;
for (int i = 0; i < NumRenderAreas; ++i)
topLayout->addWidget(renderAreas[i], i / 3, i % 3);
QGridLayout *mainLayout = new QGridLayout;
mainLayout->addLayout(topLayout, 0, 0, 1, 4);
mainLayout->addWidget(fillRuleLabel, 1, 0);
mainLayout->addWidget(fillRuleComboBox, 1, 1, 1, 3);
mainLayout->addWidget(fillGradientLabel, 2, 0);
mainLayout->addWidget(fillColor1ComboBox, 2, 1);
mainLayout->addWidget(fillToLabel, 2, 2);
mainLayout->addWidget(fillColor2ComboBox, 2, 3);
mainLayout->addWidget(penWidthLabel, 3, 0);
mainLayout->addWidget(penWidthSpinBox, 3, 1, 1, 3);
mainLayout->addWidget(penColorLabel, 4, 0);
mainLayout->addWidget(penColorComboBox, 4, 1, 1, 3);
mainLayout->addWidget(rotationAngleLabel, 5, 0);
mainLayout->addWidget(rotationAngleSpinBox, 5, 1, 1, 3);
setLayout(mainLayout);
fillRuleChanged();
fillGradientChanged();
penColorChanged();
penWidthSpinBox->setValue(2);
setWindowTitle(tr("Painter Paths"));
}
void Window::fillRuleChanged() {
Qt::FillRule rule = (Qt::FillRule)currentItemData(fillRuleComboBox).toInt();
for (int i = 0; i < NumRenderAreas; ++i)
renderAreas[i]->setFillRule(rule);
}
void Window::fillGradientChanged() {
QColor color1 = qvariant_cast<QColor>(currentItemData(fillColor1ComboBox));
QColor color2 = qvariant_cast<QColor>(currentItemData(fillColor2ComboBox));
for (int i = 0; i < NumRenderAreas; ++i)
renderAreas[i]->setFillGradient(color1, color2);
}
void Window::penColorChanged() {
QColor color = qvariant_cast<QColor>(currentItemData(penColorComboBox));
for (int i = 0; i < NumRenderAreas; ++i)
renderAreas[i]->setPenColor(color);
}
void Window::populateWithColors(QComboBox *comboBox) {
QStringList colorNames = QColor::colorNames();
foreach (QString name, colorNames)
comboBox->addItem(name, QColor(name));
}
QVariant Window::currentItemData(QComboBox *comboBox) {
return comboBox->itemData(comboBox->currentIndex());
}
- include <QApplication>
- include "window.h"
int main(int argc, char *argv[]) {
QApplication app(argc, argv); Window window; window.show(); return app.exec();
}
</source>
Subclass QWidget
<source lang="cpp"> /****************************************************************************
- Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
- All rights reserved.
- Contact: Nokia Corporation (qt-info@nokia.com)
- This file is part of the documentation of the Qt Toolkit.
- $QT_BEGIN_LICENSE:LGPL$
- Commercial Usage
- Licensees holding valid Qt Commercial licenses may use this file in
- accordance with the Qt Commercial License Agreement provided with the
- Software or, alternatively, in accordance with the terms contained in
- a written agreement between you and Nokia.
- GNU Lesser General Public License Usage
- Alternatively, this file may be used under the terms of the GNU Lesser
- General Public License version 2.1 as published by the Free Software
- Foundation and appearing in the file LICENSE.LGPL included in the
- packaging of this file. Please review the following information to
- ensure the GNU Lesser General Public License version 2.1 requirements
- will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
- In addition, as a special exception, Nokia gives you certain additional
- rights. These rights are described in the Nokia Qt LGPL Exception
- version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
- GNU General Public License Usage
- Alternatively, this file may be used under the terms of the GNU
- General Public License version 3.0 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 3.0 requirements will be
- met: http://www.gnu.org/copyleft/gpl.html.
- If you have questions regarding the use of this file, please contact
- Nokia at qt-info@nokia.com.
- $QT_END_LICENSE$
-
- /
- include <QCheckBox>
- include <QMouseEvent>
class MyCheckBox : public QCheckBox { public:
void mousePressEvent(QMouseEvent *event);
}; void MyCheckBox::mousePressEvent(QMouseEvent *event) {
if (event->button() == Qt::LeftButton) {
// handle left mouse button here
} else {
// pass on other buttons to base class
QCheckBox::mousePressEvent(event);
}
} class MyWidget : public QWidget { public:
bool event(QEvent *event);
}; static const int MyCustomEventType = 1099; class MyCustomEvent : public QEvent { public:
MyCustomEvent() : QEvent((QEvent::Type)MyCustomEventType) {}
}; bool MyWidget::event(QEvent *event) {
if (event->type() == QEvent::KeyPress) {
QKeyEvent *ke = static_cast<QKeyEvent *>(event);
if (ke->key() == Qt::Key_Tab) {
return true;
}
} else if (event->type() == MyCustomEventType) {
MyCustomEvent *myEvent = static_cast<MyCustomEvent *>(event);
return true;
}
return QWidget::event(event);
} int main() { }
</source>
Subclass QWidget to do paint
<source lang="cpp"> /****************************************************************************
- Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
- All rights reserved.
- Contact: Nokia Corporation (qt-info@nokia.com)
- This file is part of the documentation of the Qt Toolkit.
- $QT_BEGIN_LICENSE:LGPL$
- Commercial Usage
- Licensees holding valid Qt Commercial licenses may use this file in
- accordance with the Qt Commercial License Agreement provided with the
- Software or, alternatively, in accordance with the terms contained in
- a written agreement between you and Nokia.
- GNU Lesser General Public License Usage
- Alternatively, this file may be used under the terms of the GNU Lesser
- General Public License version 2.1 as published by the Free Software
- Foundation and appearing in the file LICENSE.LGPL included in the
- packaging of this file. Please review the following information to
- ensure the GNU Lesser General Public License version 2.1 requirements
- will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
- In addition, as a special exception, Nokia gives you certain additional
- rights. These rights are described in the Nokia Qt LGPL Exception
- version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
- GNU General Public License Usage
- Alternatively, this file may be used under the terms of the GNU
- General Public License version 3.0 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 3.0 requirements will be
- met: http://www.gnu.org/copyleft/gpl.html.
- If you have questions regarding the use of this file, please contact
- Nokia at qt-info@nokia.com.
- $QT_END_LICENSE$
-
- /
- include <QtGui>
class MyWidget : public QWidget { public:
MyWidget();
protected:
void paintEvent(QPaintEvent *);
}; MyWidget::MyWidget() {
QPalette palette(MyWidget::palette()); palette.setColor(backgroundRole(), Qt::white); setPalette(palette);
} void MyWidget::paintEvent(QPaintEvent *) {
QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing); painter.setPen(Qt::darkGreen); painter.drawRect(1, 2, 6, 4); painter.setPen(Qt::darkGray); painter.drawLine(2, 8, 6, 2);
} int main(int argc, char *argv[]) {
QApplication app(argc, argv); MyWidget widget; widget.show(); return app.exec();
}
</source>
Using QStatus tip event
<source lang="cpp"> /****************************************************************************
- Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
- All rights reserved.
- Contact: Nokia Corporation (qt-info@nokia.com)
- This file is part of the documentation of the Qt Toolkit.
- $QT_BEGIN_LICENSE:LGPL$
- Commercial Usage
- Licensees holding valid Qt Commercial licenses may use this file in
- accordance with the Qt Commercial License Agreement provided with the
- Software or, alternatively, in accordance with the terms contained in
- a written agreement between you and Nokia.
- GNU Lesser General Public License Usage
- Alternatively, this file may be used under the terms of the GNU Lesser
- General Public License version 2.1 as published by the Free Software
- Foundation and appearing in the file LICENSE.LGPL included in the
- packaging of this file. Please review the following information to
- ensure the GNU Lesser General Public License version 2.1 requirements
- will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
- In addition, as a special exception, Nokia gives you certain additional
- rights. These rights are described in the Nokia Qt LGPL Exception
- version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
- GNU General Public License Usage
- Alternatively, this file may be used under the terms of the GNU
- General Public License version 3.0 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 3.0 requirements will be
- met: http://www.gnu.org/copyleft/gpl.html.
- If you have questions regarding the use of this file, please contact
- Nokia at qt-info@nokia.com.
- $QT_END_LICENSE$
-
- /
- include <QtGui>
- include <QApplication>
class MainWindow : public QMainWindow { public:
MainWindow(QWidget *parent = 0);
};
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
QWidget *myWidget = new QWidget;
myWidget->setStatusTip(tr("This is my widget."));
setCentralWidget(myWidget);
QMenu *fileMenu = menuBar()->addMenu(tr("File"));
QAction *newAct = new QAction(tr("&New"), this);
newAct->setStatusTip(tr("Create a new file."));
fileMenu->addAction(newAct);
statusBar()->showMessage(tr("Ready"));
setWindowTitle(tr("QStatusTipEvent"));
}
int main(int argc, char *argv[]) {
QApplication app(argc, argv); MainWindow window; window.show(); return app.exec();
}
</source>
Wiggly Widget
<source lang="cpp"> /****************************************************************************
- Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
- All rights reserved.
- Contact: Nokia Corporation (qt-info@nokia.com)
- This file is part of the examples of the Qt Toolkit.
- $QT_BEGIN_LICENSE:LGPL$
- Commercial Usage
- Licensees holding valid Qt Commercial licenses may use this file in
- accordance with the Qt Commercial License Agreement provided with the
- Software or, alternatively, in accordance with the terms contained in
- a written agreement between you and Nokia.
- GNU Lesser General Public License Usage
- Alternatively, this file may be used under the terms of the GNU Lesser
- General Public License version 2.1 as published by the Free Software
- Foundation and appearing in the file LICENSE.LGPL included in the
- packaging of this file. Please review the following information to
- ensure the GNU Lesser General Public License version 2.1 requirements
- will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
- In addition, as a special exception, Nokia gives you certain additional
- rights. These rights are described in the Nokia Qt LGPL Exception
- version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
- GNU General Public License Usage
- Alternatively, this file may be used under the terms of the GNU
- General Public License version 3.0 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 3.0 requirements will be
- met: http://www.gnu.org/copyleft/gpl.html.
- If you have questions regarding the use of this file, please contact
- Nokia at qt-info@nokia.com.
- $QT_END_LICENSE$
-
- /
- ifndef WIGGLYWIDGET_H
- define WIGGLYWIDGET_H
- include <QBasicTimer>
- include <QWidget>
class WigglyWidget : public QWidget {
Q_OBJECT
public:
WigglyWidget(QWidget *parent = 0);
public slots:
void setText(const QString &newText) { text = newText; }
protected:
void paintEvent(QPaintEvent *event); void timerEvent(QTimerEvent *event);
private:
QBasicTimer timer; QString text; int step;
};
- endif
- include <QtGui>
- include "wigglywidget.h"
WigglyWidget::WigglyWidget(QWidget *parent)
: QWidget(parent)
{
setBackgroundRole(QPalette::Midlight); setAutoFillBackground(true); QFont newFont = font(); newFont.setPointSize(newFont.pointSize() + 20); setFont(newFont); step = 0; timer.start(60, this);
}
void WigglyWidget::paintEvent(QPaintEvent * /* event */)
{
static const int sineTable[16] = {
0, 38, 71, 92, 100, 92, 71, 38, 0, -38, -71, -92, -100, -92, -71, -38
};
QFontMetrics metrics(font());
int x = (width() - metrics.width(text)) / 2;
int y = (height() + metrics.ascent() - metrics.descent()) / 2;
QColor color;
QPainter painter(this);
for (int i = 0; i < text.size(); ++i) {
int index = (step + i) % 16;
color.setHsv((15 - index) * 16, 255, 191);
painter.setPen(color);
painter.drawText(x, y - ((sineTable[index] * metrics.height()) / 400),
QString(text[i]));
x += metrics.width(text[i]);
}
}
void WigglyWidget::timerEvent(QTimerEvent *event)
{
if (event->timerId() == timer.timerId()) {
++step;
update();
} else {
QWidget::timerEvent(event);
}
}
- ifndef DIALOG_H
- define DIALOG_H
- include <QDialog>
class Dialog : public QDialog {
Q_OBJECT
public:
Dialog(QWidget *parent = 0);
};
- endif
- include <QtGui>
- include "dialog.h"
- include "wigglywidget.h"
Dialog::Dialog(QWidget *parent)
: QDialog(parent)
{
WigglyWidget *wigglyWidget = new WigglyWidget;
QLineEdit *lineEdit = new QLineEdit;
QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(wigglyWidget);
layout->addWidget(lineEdit);
setLayout(layout);
connect(lineEdit, SIGNAL(textChanged(QString)),
wigglyWidget, SLOT(setText(QString)));
lineEdit->setText(tr("Hello world!"));
setWindowTitle(tr("Wiggly"));
resize(360, 145);
}
- include <QApplication>
- include "dialog.h"
int main(int argc, char *argv[]) {
QApplication app(argc, argv); Dialog dialog; dialog.show(); return app.exec();
}
</source>
