Qt/C++ 无边框随便拖动调整大小

#include "AbsFrameLessAutoSize.h" #include<qdebug.h> AbsFrameLessAutoSize::AbsFrameLessAutoSize(QWidget *parent) : QWidget(parent) { m_border=4; m_state.MousePressed=false; setMinimumSize(400,550); setMaximumSize(800,700); setMouseTracking(true); setWindowFlags(Qt::FramelessWindowHint); //setting windows tool bar icon invisiable setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Expanding); } void AbsFrameLessAutoSize::mouseMoveRect(const QPoint& p) { if(!m_state.IsPressBorder) { if( p.x()>width()-m_border&&p.y()<height()-m_border&&p.y()>m_border)//right side { setCursor(Qt::SizeHorCursor); m_curPos= CursorPos::Right; } else if(p.x()<m_border&&p.y()<height()-m_border&&p.y()>m_border)//left side; { setCursor(Qt::SizeHorCursor); m_curPos= CursorPos::Left; } else if(p.y()>height()-m_border&&p.x()>m_border&&p.x()<width()-m_border)//bottom side; { setCursor(Qt::SizeVerCursor); m_curPos= CursorPos::Bottom; } else if(p.y()<m_border&&p.x()>m_border&&p.x()<width()-m_border) { setCursor(Qt::SizeVerCursor); m_curPos=CursorPos::Top; } //corner else if(p.y()<m_border&&p.x()>width()-m_border) { setCursor(Qt::SizeBDiagCursor); m_curPos=CursorPos::TopRight; } else if(p.y()<m_border&&p.x()<m_border) { setCursor(Qt::SizeFDiagCursor); m_curPos=CursorPos::TopLeft; } else if(p.x()>m_border&&p.y()>height()-m_border) { setCursor(Qt::SizeFDiagCursor); m_curPos=CursorPos::BottomRight; } else if(p.x()<m_border&&p.y()>height()-m_border) { setCursor(Qt::SizeBDiagCursor); m_curPos=CursorPos::BottomLeft; } //// else { setCursor(Qt::ArrowCursor); } } else { switch (m_curPos) { case CursorPos::Right: { int setW=QCursor::pos().x()-x(); if(minimumWidth()<=setW&&setW<=maximumWidth()) setGeometry(x(),y(),setW,height()); break; } case CursorPos::Left: { int setW=x()+width()-QCursor::pos().x(); int setX=QCursor::pos().x(); if(minimumWidth()<=setW&&setW<=maximumWidth()) setGeometry(setX,y(),setW,height()); break; } case CursorPos::Bottom: { int setH=QCursor::pos().y()-y(); if(minimumHeight()<=setH&&setH<=maximumHeight()) setGeometry(x(),y(),width(),setH); break; } case CursorPos::Top: { int setH=y()-QCursor::pos().y()+height(); if(minimumHeight()<=setH&&setH<=maximumHeight()) setGeometry(x(),QCursor::pos().y(),width(),setH); break; } case CursorPos::TopRight: { int setH=y()+height()-QCursor::pos().y(); int setW=QCursor::pos().x()-x(); int setY=QCursor::pos().y(); if(setH>=maximumHeight()) { setY=m_state.WindowPos.y()+m_state.PressedSize.height()-height(); setH=maximumHeight(); } if(setH<=minimumHeight()) { setY=m_state.WindowPos.y()+m_state.PressedSize.height()-height(); setH=minimumHeight(); } setGeometry(m_state.WindowPos.x(),setY,setW,setH); break; } case CursorPos::TopLeft: { int setY=QCursor::pos().y(); int setX=QCursor::pos().x(); int setW=pos().x()+width()-setX; int setH=pos().y()+height()-setY; int totalW= m_state.WindowPos.x()+m_state.PressedSize.width(); int totalH=m_state.WindowPos.y()+m_state.PressedSize.height(); if(totalW-setX>=maximumWidth()) { setX=totalW-maximumWidth(); setW=maximumWidth(); } if(totalW-setX<=minimumWidth()) { setX=totalW-minimumWidth(); setW=minimumWidth(); } if(totalH-setY>=maximumHeight()) { setY=totalH-maximumHeight(); setH=maximumHeight(); } if(totalH-setY<=minimumHeight()) { setY=totalH-minimumHeight(); setH=minimumHeight(); } setGeometry(setX,setY,setW,setH); break; } case CursorPos::BottomRight: { int setW=QCursor::pos().x()-x(); int setH=QCursor::pos().y()-y(); setGeometry(m_state.WindowPos.x(),m_state.WindowPos.y(),setW,setH); break; } case CursorPos::BottomLeft: { int setW=x()+width()-QCursor::pos().x(); int setH=QCursor::pos().y()-m_state.WindowPos.y(); int setX=QCursor::pos().x(); int totalW= m_state.WindowPos.x()+m_state.PressedSize.width(); if(totalW-setX>=maximumWidth()) { setX=totalW-maximumWidth(); setW=maximumWidth(); } if(totalW-setX<=minimumWidth()) { setX=totalW-minimumWidth(); setW=minimumWidth(); } setGeometry(setX,m_state.WindowPos.y(),setW,setH); break; } default: break; } } } void AbsFrameLessAutoSize::mousePressEvent(QMouseEvent *event) { m_state.PressedSize=this->size(); m_state.IsPressBorder=false; setFocus(); if (event->button() == Qt::LeftButton) { m_state.WindowPos = this->pos(); //save the prssed position if(QRect(m_border+1,m_border+1,width()-(m_border+1)*2,height()-(m_border+1)*2).contains(event->pos())) { m_state.MousePos = event->globalPos(); m_state.MousePressed = true; } else m_state.IsPressBorder=true; } } void AbsFrameLessAutoSize::mouseMoveEvent(QMouseEvent *event) { mouseMoveRect(mapFromGlobal(QCursor::pos())); if (m_state.MousePressed) { this->move(m_state.WindowPos + (event->globalPos() - m_state.MousePos)); } } void AbsFrameLessAutoSize::mouseReleaseEvent(QMouseEvent *event) { m_state.IsPressBorder=false; if (event->button() == Qt::LeftButton) { this->m_state.MousePressed = false; } }