this->setProperty("canMove", true);
this->setWindowFlags(Qt::FramelessWindowHint | Qt::WindowSystemMenuHint | Qt::WindowMinMaxButtonsHint);

#include "appinit.h"
#include "qapplication.h"
#include "qdesktopwidget.h"
#include "qevent.h"
#include "qwidget.h"
#include "qdebug.h"AppInit *AppInit::self = 0;
AppInit::AppInit(QObject *parent) : QObject(parent)
{
}bool AppInit::eventFilter(QObject *obj, QEvent *evt)
{QWidget *w = (QWidget *)obj;if (!w->property("canMove").toBool()) {return QObject::eventFilter(obj, evt);}//存储桌面宽高以及全屏/左侧半屏/右侧半屏 区域static int deskWidth = qApp->desktop()->availableGeometry().width();static int deskHeight = qApp->desktop()->availableGeometry().height();static QRect fullRect = qApp->desktop()->availableGeometry();static QRect leftRect = QRect(0, 0, deskWidth / 2, deskHeight);static QRect rightRect = QRect(deskWidth / 2, 0, deskWidth / 2, deskHeight);bool autoRect = w->property("autoRect").toBool();static QPoint mousePoint;static bool mousePressed = false;QMouseEvent *event = static_cast<QMouseEvent *>(evt);if (event->type() == QEvent::MouseButtonPress) {if (event->button() == Qt::LeftButton) {mousePressed = true;mousePoint = event->globalPos() - w->pos();return true;}} else if (event->type() == QEvent::MouseButtonRelease) {mousePressed = false;//计算全局坐标int x = event->globalPos().x();int y = event->globalPos().y();int offset = 10;//如果Y坐标在桌面顶部,则自动最大化//如果X坐标在桌面左侧,则自动左侧半屏幕//如果X坐标在桌面右侧,则自动右侧半屏幕//自动变化后记住当前窗体是自动产生的位置,以便下次恢复时自动应用变化前的位置if (!autoRect) {//存储最后一次的位置,自动矫正负数的坐标int oldX = w->geometry().x();oldX = oldX < 0 ? 0 : oldX;int oldY = w->geometry().y();oldY = oldY < 0 ? 0 : oldY;QRect oldRect = QRect(oldX, oldY, w->geometry().width(), w->geometry().height());if (y < offset) {w->setProperty("autoRect", true);w->setProperty("oldRect", oldRect);w->setGeometry(fullRect);} else if (x < offset) {w->setProperty("autoRect", true);w->setProperty("oldRect", oldRect);w->setGeometry(leftRect);} else if (x > (deskWidth - offset)) {w->setProperty("autoRect", true);w->setProperty("oldRect", oldRect);w->setGeometry(rightRect);}}return true;} else if (event->type() == QEvent::MouseMove) {if (mousePressed && (event->buttons() && Qt::LeftButton)) {if (!autoRect) {w->move(event->globalPos() - mousePoint);} else {QRect oldRect = w->property("oldRect").toRect();w->setProperty("autoRect", false);w->setGeometry(oldRect);}return true;}}return QObject::eventFilter(obj, evt);
}void AppInit::start()
{qApp->installEventFilter(this);
}