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By subclassing QtPieMenu and reimplementing a few functions, a menu with a different shape can be provided, which better fits the needs of your application. The following example shows how to generate a hexagon shaped pie menu with a transparent center, by reimplementing only three functions: generateMask(), reposition() and paintEvent().
hexagonpie.h:
/****************************************************************************
**
** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation ([email protected])
**
** This file is part of a Qt Solutions component.
**
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Solutions 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.
**
** Please note Third Party Software included with Qt Solutions may impose
** additional restrictions and it is the user's responsibility to ensure
** that they have met the licensing requirements of the GPL, LGPL, or Qt
** Solutions Commercial license and the relevant license of the Third
** Party Software they are using.
**
** If you are unsure which license is appropriate for your use, please
** contact Nokia at [email protected].
**
****************************************************************************/
#ifndef HEXAGONPIE_H
#define HEXAGONPIE_H
#include <qtpiemenu.h>
#include <QtGui/QColor>
class HexagonPie : public QtPieMenu
{
Q_OBJECT
public:
HexagonPie(const QString &title = QString::null,
const QColor &color = QColor(),
QWidget *parent = 0, const char *name = 0);
protected:
void generateMask(QBitmap *mask);
void reposition();
void paintEvent(QPaintEvent *e);
private:
QColor col;
};
#endif
hexagonpie.cpp:
/**************************************************************************** ** ** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation ([email protected]) ** ** This file is part of a Qt Solutions component. ** ** Commercial Usage ** Licensees holding valid Qt Commercial licenses may use this file in ** accordance with the Qt Solutions 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. ** ** Please note Third Party Software included with Qt Solutions may impose ** additional restrictions and it is the user's responsibility to ensure ** that they have met the licensing requirements of the GPL, LGPL, or Qt ** Solutions Commercial license and the relevant license of the Third ** Party Software they are using. ** ** If you are unsure which license is appropriate for your use, please ** contact Nokia at [email protected]. ** ****************************************************************************/ /* This example demonstrates subclassing of QtPieMenu in order to provide a different shape. It reimplements the functions generateMask(), reposition() and paintEvent(). The basic shape is a hexagon. */ #include "hexagonpie.h" #include <QtCore/QObject> #include <QtGui/QPainter> #include <QtGui/QBitmap> #include <QtGui/QFontMetrics> #include <QtGui/QPolygon> #include <math.h> /*! Constructs a hexagon pie menu. The \a title, \a parent and \a name arguments are passed to QtPieMenu's constructor. \a color sets the color of the pie menu. This color will also be used to draw the pie item of any parent menu. */ HexagonPie::HexagonPie(const QString &title, const QColor &color, QWidget *parent, const char *name) : QtPieMenu(title, parent, name), col(color) { } /*! Draws a hexagon shape on \a mask. */ void HexagonPie::generateMask(QBitmap *mask) { QPainter p(mask); p.setPen(Qt::color1); p.setBrush(Qt::color1); int x = pix.rect().center().x(); int y = pix.rect().center().y(); for (int i = 0; i < 6; ++i) { double a = indexToAngle(i, 6, true); double b = indexToAngle(i + 1, 6, true); double ax = outerRadius() * cos(a); double ay = - outerRadius() * sin(a); double bx = outerRadius() * cos(b); double by = - outerRadius() * sin(b); double cx = innerRadius() * cos(a); double cy = - innerRadius() * sin(a); double dx = innerRadius() * cos(b); double dy = - innerRadius() * sin(b); QPolygon poly(4); poly.setPoint(0, x + (int) ax, y + (int) ay); poly.setPoint(1, x + (int) bx, y + (int) by); poly.setPoint(2, x + (int) dx, y + (int) dy); poly.setPoint(3, x + (int) cx, y + (int) cy); p.drawPolygon(poly); } } /*! The hexagon shaped pie menu has a special rule for placement; we want the sub menus to be positioned precisely next to the parent. Since this hexagon piemenu has a fixed default size, we can do a precise repositioning before the menu is shown. */ void HexagonPie::reposition() { if (!parent()->inherits("HexagonPie")) return; HexagonPie *parentPie = reinterpret_cast<HexagonPie *>(parent()); QPoint parentCenter = mapToGlobal(parentPie->pos()); if (parentPie->subMenuAt(0) == this) { move(mapFromGlobal(QPoint(parentCenter.x(), parentCenter.y() - 128))); } else if (parentPie->subMenuAt(1) == this) { move(mapFromGlobal(QPoint(parentCenter.x() - 112, parentCenter.y() - 64))); } else if (parentPie->subMenuAt(2) == this) { move(mapFromGlobal(QPoint(parentCenter.x() - 112, parentCenter.y() + 64))); } else if (parentPie->subMenuAt(3) == this) { move(mapFromGlobal(QPoint(parentCenter.x(), parentCenter.y() + 128))); } else if (parentPie->subMenuAt(4) == this) { move(mapFromGlobal(QPoint(parentCenter.x() + 112, parentCenter.y() + 64))); } else if (parentPie->subMenuAt(5) == this) { move(mapFromGlobal(QPoint(parentCenter.x() + 112, parentCenter.y() - 64))); } } /*! Draws the hexagon shape, taking shading and highlighting into consideration. */ void HexagonPie::paintEvent(QPaintEvent *) { QPainter p(&pix); pix.fill(); int x = pix.rect().center().x(); int y = pix.rect().center().y(); // Draw the segments QFontMetrics fm(font()); for (int i = 0; i < 6; ++i) { p.setPen(Qt::black); // Find the brush we should use for drawing the segments of // the menu. Each segment has its own color. QColor baseColor = col; if (itemType(i) == SubMenu) baseColor = ((HexagonPie *)subMenuAt(i))->col; if (i == highlightedItem()) { QColor tmp = Qt::white; if (baseColor.isValid()) { QColor merge((tmp.red()*3 + baseColor.red()*2)/5, (tmp.green()*3 + baseColor.green()*2)/5, (tmp.blue()*3 + baseColor.blue()*2)/5); p.setBrush(QBrush(merge)); } else { p.setBrush(QBrush(tmp)); } } else { QColor tmp = palette().background().color(); if (baseColor.isValid()) { QColor merge((tmp.red()*3 + baseColor.red()*2)/5, (tmp.green()*3 + baseColor.green()*2)/5, (tmp.blue()*3 + baseColor.blue()*2)/5); p.setBrush(QBrush(merge)); } else { p.setBrush(QBrush(tmp)); } } // Draw the polygon double a = indexToAngle(i, 6, true); double b = indexToAngle(i + 1, 6, true); double ax = outerRadius() * cos(a); double ay = - outerRadius() * sin(a); double bx = outerRadius() * cos(b); double by = - outerRadius() * sin(b); double cx = innerRadius() * cos(a); double cy = - innerRadius() * sin(a); double dx = innerRadius() * cos(b); double dy = - innerRadius() * sin(b); QPolygon pointArray(4); pointArray.putPoints(0, 4, x + (int) ax, y + (int) ay, x + (int) bx, y + (int) by, x + (int) dx, y + (int) dy, x + (int) cx, y + (int) cy); p.drawPolygon(pointArray); if (!itemText(i).isEmpty()) { QFont font = p.font(); if (i == highlightedItem()) { p.setPen(Qt::white); font.setBold(true); } else { p.setPen(palette().text().color()); font.setBold(false); } p.setFont(font); // Draw the title text QString t = itemText(i); p.drawText((int) (x + (ax + bx + cx + dx) / 4 - fm.width(t) / 2), (int) (y + (ay + by + cy + dy) / 4), t); font.setBold(false); p.setFont(font); } } QPainter p2(this); p2.drawPixmap(QPoint(0, 0), pix); }
main.cpp:
/**************************************************************************** ** ** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation ([email protected]) ** ** This file is part of a Qt Solutions component. ** ** Commercial Usage ** Licensees holding valid Qt Commercial licenses may use this file in ** accordance with the Qt Solutions 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. ** ** Please note Third Party Software included with Qt Solutions may impose ** additional restrictions and it is the user's responsibility to ensure ** that they have met the licensing requirements of the GPL, LGPL, or Qt ** Solutions Commercial license and the relevant license of the Third ** Party Software they are using. ** ** If you are unsure which license is appropriate for your use, please ** contact Nokia at [email protected]. ** ****************************************************************************/ #include "hexagonpie.h" #include <QtGui/QApplication> #include <QtGui/QTextEdit> #include <QtGui/QMouseEvent> class MyEditor : public QTextEdit { Q_OBJECT public: MyEditor() { // Create a pie menu with six submenus, and no action items. pie = new HexagonPie("Root", Qt::black, this, "Root"); pie->insertItem(new HexagonPie("N", Qt::red, pie, "N")); pie->insertItem(new HexagonPie("NW", Qt::green, pie, "NW")); pie->insertItem(new HexagonPie("SW", Qt::blue, pie, "SW")); pie->insertItem(new HexagonPie("S", Qt::yellow, pie, "S")); pie->insertItem(new HexagonPie("SE", Qt::gray, pie, "SE")); pie->insertItem(new HexagonPie("NE", Qt::cyan, pie, "NE")); for (int i = 0; i < 6; ++i) { HexagonPie *subPie = (HexagonPie *)pie->subMenuAt(i); subPie->insertItem("A", this, SLOT(noop())); subPie->insertItem("B", this, SLOT(noop())); subPie->insertItem("C", this, SLOT(noop())); subPie->insertItem("D", this, SLOT(noop())); subPie->insertItem("E", this, SLOT(noop())); subPie->insertItem("F", this, SLOT(noop())); } } public slots: void noop() { } protected: void mousePressEvent(QMouseEvent *e) { if ( e->button() & Qt::RightButton ) { pie->popup(e->globalPos()); return; } QTextEdit::mousePressEvent( e ); } private: HexagonPie *pie; }; int main(int argc, char *argv[]) { QApplication app(argc, argv); MyEditor editor; editor.show(); return app.exec(); } #include "main.moc"
hexagon.pro:
TEMPLATE = app INCLUDEPATH += . include(../../src/qtpiemenu.pri) # Input HEADERS += hexagonpie.h SOURCES += hexagonpie.cpp main.cpp
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