(C++) QtLeftRightRectItem

January 25, 2018 · View on GitHub

(C++) QtLeftRightRectItem

Qt
Creator Lubuntu

QtLeftRightRectItem is a Qt QGraphicsItem class that has a left and right focus.

Technical facts

./CppQtLeftRightRectItem/CppQtLeftRightRectItem.pri

`INCLUDEPATH += \ ../../Classes/CppQtLeftRightRectItem SOURCES += \ ../../Classes/CppQtLeftRightRectItem/qtleftrightrectitem.cpp HEADERS += \ ../../Classes/CppQtLeftRightRectItem/qtleftrightrectitem.h OTHER_FILES += \ ../../Classes/CppQtLeftRightRectItem/Licence.txt`

./CppQtLeftRightRectItem/qtleftrightrectitem.h

./CppQtLeftRightRectItem/qtleftrightrectitem.cpp

//--------------------------------------------------------------------------- /* QtLeftRightRectItem, QGraphicsRectItem with a left and right rectangle Copyright 2012-2015 Richel Bilderbeek This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program.If not, see <http://www.gnu.org/licenses/>. / //--------------------------------------------------------------------------- //From http://www.richelbilderbeek.nl/CppQtLeftRightRectItem.htm //--------------------------------------------------------------------------- #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Weffc++" #pragma GCC diagnostic ignored "-Wunused-local-typedefs" #pragma GCC diagnostic ignored "-Wunused-but-set-parameter" #include "qtleftrightrectitem.h" #include <cassert> #include <sstream> //#include <QGraphicsScene> #include <QPainter> #include <QKeyEvent> #pragma GCC diagnostic pop ribi::QtLeftRightRectItem::QtLeftRightRectItem(QGraphicsItem parent) : QGraphicsRectItem(parent), m_signal_request_scene_update{}, m_focus(Focus::left) { this->setFlags( QGraphicsItem::ItemIsFocusable | QGraphicsItem::ItemIsMovable | QGraphicsItem::ItemIsSelectable); this->setRect(-16.0,-16.0,32.0,32.0); } std::string ribi::QtLeftRightRectItem::GetVersion() noexcept { return "1.1"; } std::vector<std::string> ribi::QtLeftRightRectItem::GetVersionHistory() noexcept { std::vector<std::string> v; v.push_back("2012-12-19: version 1.0: initial version"); v.push_back("2013-07-25: version 1.1: transition to Qt5"); return v; } void ribi::QtLeftRightRectItem::keyPressEvent(QKeyEvent* event) { switch (event->key()) { case Qt::Key_F1: { m_focus = Focus::left; this->update(); //m_signal_request_scene_update(); //return; } break; case Qt::Key_F2: { { m_focus = Focus::right; this->update(); //m_signal_request_scene_update(); //return; } } break; } QGraphicsRectItem::keyPressEvent(event); } #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wunused-but-set-parameter" void ribi::QtLeftRightRectItem::mouseMoveEvent(QGraphicsSceneMouseEvent* event) { m_signal_request_scene_update(); QGraphicsRectItem::mouseMoveEvent(event); } #pragma GCC diagnostic pop void ribi::QtLeftRightRectItem::paint(QPainter* painter, const QStyleOptionGraphicsItem* , QWidget* ) { //Always draw the outer rect if (this->hasFocus() || this->isSelected()) { painter->setPen(QPen(Qt::DashLine)); } painter->drawRect(rect()); painter->setPen(QPen(Qt::SolidLine)); const double hw = 0.5 * rect().width(); //Half-width QRectF rect_left = rect().adjusted( 2.0,2.0,-hw-2.0,-2.0); QRectF rect_right = rect().adjusted(hw+2.0,2.0, -2.0,-2.0); //The item can be selected by clicking on it //The item can have focus by moving towards it switch (m_focus) { case Focus::left: { painter->drawRect(rect_right); painter->setPen(QPen(QColor(255,0,0))); painter->drawRect(rect_left); } break; case Focus::right: { painter->drawRect(rect_left); painter->setPen(QPen(QColor(255,0,0))); painter->drawRect(rect_right); } break; default: assert(!"Should not get here"); } }