信息类网站,望野王绩拼音版,高明网站建设,wordpress 4.6在上篇 《C设计模式——Bridge模式#xff08;上#xff09;》中我们对于桥接模式做了一些介绍。介于桥接模式在实际项目开发中使用广泛#xff0c;而且也是面试中常问常新的话题。在本篇#xff0c;我们专注bridge模式在具体的项目开发中的应用#xff0c;举几个例子来说…在上篇 《C设计模式——Bridge模式上》中我们对于桥接模式做了一些介绍。介于桥接模式在实际项目开发中使用广泛而且也是面试中常问常新的话题。在本篇我们专注bridge模式在具体的项目开发中的应用举几个例子来说明。
#ifndef SHAPE_H
#define SHAPE_H#include QObject
#include QWidget
#include QColor
#include QPointF
#include QPaintEvent
#include QPainter
#include QPen
#include QBrush
#include QDebugclass ShapeImp;class Shape
{public:virtual void draw() 0;virtual void setLineColor(const QColor color) 0;virtual void setLineWidth(const int width) 0;virtual ~Shape() {}
protected:Shape(ShapeImp* imp) : imp_(imp) {}ShapeImp* imp_;
};class ShapeImp : public QWidget
{
public:virtual void draw() 0;virtual void setLineColor(const QColor color) 0;virtual void setLineWidth(const int width) 0;virtual ~ShapeImp() {}
protected:ShapeImp(QWidget* parent nullptr):QWidget(parent) {}friend class Shape;
};class ShapeImpWin : public Shape
{
public:ShapeImpWin(ShapeImp* pImpl) : Shape(pImpl) {}
public: // operationvoid draw() override{ imp_-draw(); }void setLineColor (const QColor color) override { imp_-setLineColor(color); }void setLineWidth(const int width) override { imp_-setLineWidth(width);}
};class Circle : public ShapeImp
{Q_OBJECT
public:Circle(const QPointF center,qreal raduis,QWidget* parent nullptr): m_center(center),m_raduis(raduis),ShapeImp(parent){}void draw(){ update(); }void setLineColor(const QColor color) override {m_color color;}void setLineWidth(const int width) override{ m_lineWidth width; }virtual void paintEvent(QPaintEvent* e) override{QPainter painter(this);QPen pen;pen.setColor( m_color /*QColor(Qt::red)*/);pen.setWidth(m_lineWidth);QBrush brush;brush.setColor(QColor(Qt::lightGray));painter.setPen(pen);painter.setBrush(brush);// draw circlepainter.drawEllipse(m_center,m_raduis,m_raduis);e-accept();}private:QPointF m_center;qreal m_raduis 50;QColor m_color QColor(Qt::black);int m_lineWidth 1;
};class Rectange : public ShapeImp
{Q_OBJECT
public:Rectange(const QPointF topleft,qreal width,qreal height,QWidget* parent nullptr): m_topleft(topleft),m_width(width),m_height(height),ShapeImp(parent){}void draw(){ update(); }void setLineColor(const QColor color) override {m_color color;}void setLineWidth(const int width) override{ m_lineWidth width; }virtual void paintEvent(QPaintEvent* e) override{QPainter painter(this);QPen pen;pen.setColor( m_color /*QColor(Qt::red)*/);pen.setWidth(m_lineWidth);QBrush brush;brush.setColor(QColor(Qt::lightGray));painter.setPen(pen);painter.setBrush(brush);// draw circleQRectF r(m_topleft.x(),m_topleft.y(),m_width,m_height);painter.drawRect(r);qDebug() r;e-accept();}private:QPointF m_topleft;qreal m_width 100;qreal m_height 100;QColor m_color QColor(Qt::black);int m_lineWidth 1;
};
#endif // SHAPE_H#include board.h#include QApplication
#include shape.h
#include QHBoxLayoutint main(int argc, char *argv[])
{QApplication a(argc, argv);ShapeImp* pImpl_circle new Circle(QPointF(100,100),80);pImpl_circle-setFixedSize(300,300);Shape* pShape new ShapeImpWin(pImpl_circle);pShape-setLineWidth(1);pShape-setLineColor(QColor(Qt::red));pShape-draw();pImpl_circle-show();ShapeImp* pImpl_rect new Rectange(QPointF(10,10),80,80);pImpl_rect-setFixedSize(300,300);Shape* pShap1 new ShapeImpWin(pImpl_rect);pShap1-setLineWidth(1);pShap1-setLineColor(QColor(Qt::red));pShap1-draw();pImpl_rect-show();return a.exec();
}
