(C++) Widget

 

 

A widget/control is a user interface element, like a button or checkbox.

 

Widget is a GUI independent widget class and servers as a base class for others (incomplete list):

• QtDialWidget
• QtLedWidget
• QtShapeWidget
• DialWidget
• LedWidget
• ShapeWidget
• WtDialWidget
• WtLedWidget
• WtShapeWidget

 

Similar widget classes are QWidget and Wt::WWidget.

Technical facts

 

 

 

 

 

 

./CppWidget/CppWidget.pri

 

---

INCLUDEPATH += \     ../../Classes/CppWidget SOURCES += \     ../../Classes/CppWidget/widget.cpp HEADERS  += \     ../../Classes/CppWidget/widget.h OTHER_FILES += \     ../../Classes/CppWidget/Licence.txt

 

 

 

 

 

./CppWidget/widget.h

 

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//--------------------------------------------------------------------------- /* Widget, GUI independent widget class Copyright 2011-2015 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/CppWidget.htm //--------------------------------------------------------------------------- #ifndef WIDGET_H #define WIDGET_H #include <string> #include <vector> #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 <boost/make_shared.hpp> #include <boost/checked_delete.hpp> #include <boost/scoped_ptr.hpp> #include <boost/signals2.hpp> #include <boost/geometry/geometries/box.hpp> #include <boost/geometry/geometries/point_xy.hpp> #pragma GCC diagnostic pop namespace ribi { ///GUI indepedent widget class, modeled after the Qt and Wt architure struct Widget {   typedef boost::geometry::model::d2::point_xy<double> Point;   typedef boost::geometry::model::box<Point> Rect;   static Rect CreateRect(const double left, const double top, const double width, const double height) noexcept;   double GetBottom() const noexcept;   const Rect& GetGeometry() const noexcept { return m_geometry; }   Rect& GetGeometry() noexcept { return m_geometry; }   double GetHeight() const noexcept;   double GetLeft() const noexcept;   double GetRight() const noexcept;   double GetTop() const noexcept;   static std::string GetVersion() noexcept;   static std::vector<std::string> GetVersionHistory() noexcept;   double GetWidth() const noexcept;   ///Is the coordinat within the widget its rectangle?   bool IsIn(const double x, const double y) const noexcept;   ///SetGeometry resizes the Widget and emits an OnResize signal   void SetGeometry(const Rect& geometry) noexcept;   void SetGeometry(const double left, const double top, const double width, const double height) noexcept;   ///Respond to a change in size   mutable boost::signals2::signal<void ()> m_signal_geometry_changed;   protected:   virtual ~Widget() noexcept {}   friend void boost::checked_delete<>(      Widget*);   friend void boost::checked_delete<>(const Widget*);   friend class boost::detail::sp_ms_deleter<      Widget>;   friend class boost::detail::sp_ms_deleter<const Widget>;   private:   Rect m_geometry; }; } //~namespace ribi #endif // WIDGET_H

 

 

 

 

 

./CppWidget/widget.cpp

 

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//--------------------------------------------------------------------------- /* Widget, GUI independent widget class Copyright 2011-2015 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/CppWidget.htm //--------------------------------------------------------------------------- #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Weffc++" #pragma GCC diagnostic ignored "-Wunused-but-set-parameter" #pragma GCC diagnostic ignored "-Wunused-local-typedefs" #include "widget.h" #include "geometry.h" #include <boost/geometry/algorithms/equals.hpp> #pragma GCC diagnostic pop ribi::Widget::Rect ribi::Widget::CreateRect(   const double left, const double top, const double width, const double height) noexcept {   return Geometry().CreateRect(left,top,width,height); } double ribi::Widget::GetBottom() const noexcept {   return Geometry().GetBottom(m_geometry); } double ribi::Widget::GetHeight() const noexcept {   return Geometry().GetHeight(m_geometry); } double ribi::Widget::GetLeft() const noexcept {   return Geometry().GetLeft(m_geometry); } double ribi::Widget::GetRight() const noexcept {   return Geometry().GetRight(m_geometry); } double ribi::Widget::GetTop() const noexcept {   return Geometry().GetTop(m_geometry); } std::string ribi::Widget::GetVersion() noexcept {   return "2.0"; } std::vector<std::string> ribi::Widget::GetVersionHistory() noexcept {   return {     "2011-07-03: version 1.0: initial version",     "2011-08-07: version 1.1: added signal that is emitted when geometry changes",     "2014-03-28: version 2.0: replace Rect by Boost.Geometry its box class"   }; } double ribi::Widget::GetWidth() const noexcept {   return Geometry().GetWidth(m_geometry); } bool ribi::Widget::IsIn(const double x, const double y) const noexcept {   return boost::geometry::within(Point(x,y),m_geometry); } void ribi::Widget::SetGeometry(const double left, const double top, const double width, const double height) noexcept {   SetGeometry(CreateRect(left,top,width,height)); } void ribi::Widget::SetGeometry(const Rect& geometry) noexcept {   if (!boost::geometry::equals(m_geometry,geometry))   {     m_geometry = geometry;     m_signal_geometry_changed();   } }