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();
}