Qt仿win7自动顶部最大化左侧右侧半屏效果

#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); }