Qt 5.11 无边框可拖动 可改变大小窗口

#include "movewidget.h" #include "movewidget.h" #include <QMouseEvent> #include <QStyleOption> #include <QPainter> #include <QHBoxLayout> #include <QDebug> movewidget::movewidget(QWidget *parent) : QWidget(parent) { setWindowFlags(Qt::FramelessWindowHint); border_px = 4; posBy = pos_none; setMouseTracking(true); } void movewidget::mousePressEvent(QMouseEvent *event) { event->ignore(); if (event->button() == Qt::LeftButton) { win_pos = event->globalPos() - frameGeometry().topLeft(); } } void movewidget::mouseMoveEvent(QMouseEvent *event) { if (event->buttons() & Qt::LeftButton){ if(posBy == pos_none){ move(event->globalPos() - win_pos); } else{ int m_top,m_bottom,m_left,pright; m_top = frameGeometry().top(); m_bottom =frameGeometry().bottom(); m_left = frameGeometry().left(); pright = frameGeometry().right(); if(posBy & top){ if(height() == minimumHeight()){ m_top = qMin(event->y()+this->pos().y(),m_top); } else if(height() == maximumHeight()){ m_top = qMax(event->y()+this->pos().y(),m_top); } else{ m_top = event->y()+this->pos().y(); } } else if(posBy & bottom){ if(height() == minimumHeight()){ m_bottom = qMax(event->y()+this->pos().y(),m_top); } else if(height() == maximumHeight()){ m_bottom = qMin(event->y()+this->pos().y(),m_top); } else{ m_bottom = event->y()+this->pos().y(); } } if(posBy & left){ if(width() == minimumWidth()){ m_left = qMin(event->x()+this->pos().x(),m_left); } else if(width() == maximumWidth()){ m_left = qMax(event->x()+this->pos().x(),m_left); } else{ m_left = event->x()+this->pos().x(); } } else if(posBy & right){ if(width() == minimumWidth()){ pright = qMax(event->x()+this->pos().x(),pright); } else if(width() == maximumWidth()){ pright = qMin(event->x()+this->pos().x(),pright); } else{ pright =event->x()+this->pos().x(); } } setGeometry(QRect(QPoint(m_left,m_top),QPoint(pright,m_bottom))); } } else arrows_update(); } void movewidget::arrows_update() { int diffLeft = abs(mapFromGlobal(cursor().pos()).x() -frameGeometry().left()+this->pos().x()); int diffRight = abs(mapFromGlobal(cursor().pos()).x() -frameGeometry().right()+this->pos().x()); int diffTop = abs(mapFromGlobal(cursor().pos()).y() - frameGeometry().top()+this->pos().y()); int diffBottom = abs(mapFromGlobal(cursor().pos()).y() - frameGeometry().bottom()+this->pos().y()); QCursor my_cursor; my_cursor = cursor(); if(diffTop < border_px){ if(diffLeft < border_px){ posBy = top_Left; my_cursor.setShape(Qt::SizeFDiagCursor); } else if(diffRight < border_px){ posBy = topRight; my_cursor.setShape(Qt::SizeBDiagCursor); } else{ posBy = top; my_cursor.setShape(Qt::SizeVerCursor); } } else if(diffBottom < border_px){ if(diffLeft < border_px){ posBy = bottomLeft; my_cursor.setShape(Qt::SizeBDiagCursor); } else if(diffRight < border_px){ posBy = bottomRight; my_cursor.setShape(Qt::SizeFDiagCursor); } else{ posBy = bottom; my_cursor.setShape(Qt::SizeVerCursor); } } else if(diffLeft < border_px){ posBy = left; my_cursor.setShape(Qt::SizeHorCursor); } else if(diffRight < border_px){ posBy = right; my_cursor.setShape(Qt::SizeHorCursor); } else{ posBy = pos_none; my_cursor.setShape(Qt::ArrowCursor); } setCursor(my_cursor); } void movewidget::mouseReleaseEvent(QMouseEvent *event) { event->ignore(); if(posBy != pos_none){ arrows_update(); } }