c/c++语言开发共享Qt实现可拖动按钮

  #ifndef selfcontained_h  #define selfcontained_h    #include <qwidget>  #include <qpainter>  #include <qtimer>  #include <qimage>  #include <qmouseevent>  #include <qvector>    #endif // selfcontained_h

  #ifndef dragbutton_h  #define dragbutton_h    #include "self-contained.h"    class dragbutton : public qwidget  {    q_object  public:    dragbutton(qwidget *parent = 0);      void setinitialscaling(double scaling);    void setpixmap(qstring pixmap);    void settext(qstring str);    void setishold(bool flag);  protected:    int ispress;    int ishold;      qtimer *m_anitimer;    qtimer *m_holdtimer;      double m_scaling;    double m_initialscaling;//当前缩放比例    qpoint m_mousesrcpos;//最小缩放比例      qpixmap m_pixmap;    qstring m_text;      void paintevent(qpaintevent *);    void enterevent(qevent *);    void leaveevent(qevent *);    void mousepressevent(qmouseevent *);    void mousereleaseevent(qmouseevent *);    void mousemoveevent(qmouseevent *);    signals:    void release_signal();    void drag_signal();//拖动时发出信号    void clicked();  public slots:    void zoomin();//放大    void zoomout();//缩小    void hold_slot();  };    #endif // dragbutton_h

  #include "dragbutton.h"    dragbutton::dragbutton(qwidget *parent) :    qwidget(parent),ispress(0),ishold(0),m_scaling(0.5),m_initialscaling(0.5),m_mousesrcpos(0,0)  {    m_anitimer = new qtimer(this);    m_anitimer->setinterval(7);      m_holdtimer = new qtimer(this);    m_holdtimer->setinterval(1000);    m_holdtimer->setsingleshot(true);    connect(m_holdtimer,signal(timeout()),this,slot(hold_slot()));  }    void dragbutton::setinitialscaling(double scaling)  {    if(scaling <= 1 && scaling > 0)    {      m_initialscaling = scaling;      m_scaling = scaling;    }  }    void dragbutton::setpixmap(qstring pixmap)  {    m_pixmap.load(pixmap);    update();  }    void dragbutton::settext(qstring str)  {    m_text = str;    update();  }    void dragbutton::setishold(bool flag)  {    ishold = flag;    update();  }    void dragbutton::paintevent(qpaintevent *)  {    if(m_pixmap.isnull())      return;      qpainter painter(this);    painter.setrenderhint(qpainter::antialiasing);      if(ispress)    {      painter.setpen(qt::nopen);      painter.setbrush(qcolor(0,0,0,130));      painter.drawroundedrect(rect(),20,20);    }      m_pixmap = m_pixmap.scaled(width(),height() - 20,qt::keepaspectratio,qt::smoothtransformation);      int w = m_pixmap.width()*m_scaling;    int h = m_pixmap.height()*m_scaling;    painter.drawpixmap(qrect((width() - w)/2,(height() - h)/2 - 20,w,h),              m_pixmap,m_pixmap.rect());      painter.setpen(qcolor(0,0,0));    painter.drawtext(qrect(0,height() - 40,width(),40),qt::aligncenter,m_text);  }    void dragbutton::enterevent(qevent *)  {    disconnect(m_anitimer,signal(timeout()),this,slot(zoomout()));    connect(m_anitimer,signal(timeout()),this,slot(zoomin()));      m_anitimer->start();  }    void dragbutton::leaveevent(qevent *)  {    disconnect(m_anitimer,signal(timeout()),this,slot(zoomin()));    connect(m_anitimer,signal(timeout()),this,slot(zoomout()));      m_anitimer->start();  }    void dragbutton::mousepressevent(qmouseevent *e)  {    if(!ishold)      ispress = 1;      m_holdtimer->start();      m_mousesrcpos = e->pos();      update();  }    void dragbutton::mousereleaseevent(qmouseevent *e)  {    m_holdtimer->stop();      ispress = 0;    ishold = 0;      if(rect().contains(e->pos()))      emit clicked();      emit release_signal();      update();  }    void dragbutton::mousemoveevent(qmouseevent *e)  {    if(ishold)    {      move(pos() - m_mousesrcpos + e->pos());      emit drag_signal();    }    else      m_mousesrcpos = e->pos();  }    void dragbutton::zoomin()  {    m_scaling += 0.01;    if(m_scaling >= 1)    {      m_scaling = 1;      m_anitimer->stop();    }    update();  }    void dragbutton::zoomout()  {    m_scaling -= 0.01;    if(m_scaling <= m_initialscaling)    {      m_scaling = m_initialscaling;      m_anitimer->stop();    }    update();  }    void dragbutton::hold_slot()  {    ishold = 1;    ispress = 0;    m_anitimer->stop();    m_scaling = m_initialscaling;      update();  }

  #include "dragbutton.h"    class dragwidget : public qwidget  {    q_object    public:    dragwidget(qwidget *parent = 0);    ~dragwidget();      void addbutton(dragbutton*);    protected:    qvector<dragbutton*> btnvector;    qpoint m_mousesrcpos;//记录坐标点      void resetinterface();//复位    signals:    public slots:    void btnmove_slots();    void btnrelease_slots();  };    #endif // dragwidget_h

  #include "dragwidget.h"    dragwidget::dragwidget(qwidget *parent)    : qwidget(parent),m_mousesrcpos(0,0)  {  }    dragwidget::~dragwidget()  {    }    void dragwidget::addbutton(dragbutton* btn)  {    connect(btn,signal(drag_signal()),this,slot(btnmove_slots()));    connect(btn,signal(release_signal()),this,slot(btnrelease_slots()));        btnvector.push_back(btn);    btn->show();    resetinterface();  }    void dragwidget::resetinterface()  {    for(int i = 0;i < btnvector.length();++i)    {      btnvector[i]->setgeometry(i * width()/btnvector.length(),0,width()/btnvector.length(),height());    }  }    void dragwidget::btnmove_slots()  {    for(int i = 0;i < btnvector.length();++i)//找到鼠标所在的按钮      if(btnvector[i] == sender())      {        int flag = (btnvector[i]->pos().x() + btnvector[i]->width()/2)/(width()/btnvector.length());          for(int l = 0;l < btnvector.length();++l)//这里也可以做动画，但这次主要实现拖动的功能        {          if(l < i && l <flag)            btnvector[l]->setgeometry(l * width()/btnvector.length(),0,width()/btnvector.length(),height());          else if((l > i && l <= flag)||(l >= flag && l < i))            btnvector[l]->setgeometry((l + ((i-flag)>0?1:-1))* width()/btnvector.length(),0,width()/btnvector.length(),height());          else if(l > flag && l > i)            btnvector[l]->setgeometry(l * width()/btnvector.length(),0,width()/btnvector.length(),height());        }        //注释部分合为上面的循环  //      if(flag >= i)//往后拖  //        for(int l = 0;l < btnvector.length();++l)  //        {  //          if(l < i)  //            btnvector[l]->setgeometry(l * width()/btnvector.length(),0,width()/btnvector.length(),height());  //          else if(l > i && l <= flag)  //            btnvector[l]->setgeometry((l - 1)* width()/btnvector.length(),0,width()/btnvector.length(),height());  //          else if(l > flag)  //            btnvector[l]->setgeometry(l * width()/btnvector.length(),0,width()/btnvector.length(),height());  //        }  //      else if(flag < i)//往前拖  //        for(int l = 0;l < btnvector.length();++l)  //        {  //          if(l < flag)  //            btnvector[l]->setgeometry(l * width()/btnvector.length(),0,width()/btnvector.length(),height());  //          else if(l >= flag && l < i)  //            btnvector[l]->setgeometry((l + 1)* width()/btnvector.length(),0,width()/btnvector.length(),height());  //          else if(l > i)  //            btnvector[l]->setgeometry(l * width()/btnvector.length(),0,width()/btnvector.length(),height());  //        }        break;      }  }    void dragwidget::btnrelease_slots()  {    for(int i = 0;i < btnvector.length();++i)//找到鼠标所在的按钮      if(btnvector[i] == sender())      {        int posx = btnvector[i]->pos().x();        if(posx < 0)          posx = 0;        else if(posx > width())          posx = width();          int flag = (posx+btnvector[i]->width()/2)/(width()/btnvector.length());          dragbutton *btn = btnvector[i];//修改vector顺序        if(flag >= i)          for(int l = i;l < flag;++l)            btnvector[l] = btnvector[l+1];        else          for(int l = i;l > flag;--l)            btnvector[l] = btnvector[l-1];          btnvector[flag] = btn;      }      resetinterface();//复位  }

  #include "dragwidget.h"  #include <qapplication>    int main(int argc, char *argv[])  {    qapplication a(argc, argv);      dragwidget ww;    ww.setgeometry(200,200,800,200);      dragbutton w(&ww);    w.setpixmap(":/image/image/contacts.png");    w.settext("按钮1");    w.setinitialscaling(0.6);      dragbutton w2(&ww);    w2.setpixmap(":/image/image/time.png");    w2.settext("按钮2");    w2.setinitialscaling(0.6);      dragbutton w3(&ww);    w3.setpixmap(":/image/image/checking.png");    w3.settext("按钮3");    w3.setinitialscaling(0.6);      dragbutton w4(&ww);    w4.setpixmap(":/image/image/suitcase.png");    w4.settext("按钮4");    w4.setinitialscaling(0.6);      ww.addbutton(&w);    ww.addbutton(&w2);    ww.addbutton(&w3);    ww.addbutton(&w4);    ww.show();      return a.exec();  }