Qt 窗口 无边框化，移动，大小调整

#include "testdialog.h" #include "ui_testdialog.h" TestDialog::TestDialog(QWidget *parent) : QDialog(parent), ui(new Ui::TestDialog) { ui->setupUi(this); this->setWindowFlags(Qt::FramelessWindowHint); setWindowFlags(Qt::FramelessWindowHint | Qt::Tool | Qt::WindowStaysOnTopHint); setWindowOpacity(0.9); setMouseTracking(true); desktop = QApplication::desktop(); } TestDialog::~TestDialog() { delete ui; } void TestDialog::mousePressEvent(QMouseEvent *event) { if (event->button() == Qt::LeftButton) { this->m_drag = true; this->dragPos = event->pos(); this->resizeDownPos = event->globalPos(); this->mouseDownRect = this->rect(); } } void TestDialog::mouseMoveEvent(QMouseEvent * event) { if (resizeRegion != Default) { handleResize(); return; } if(m_move) { move(event->globalPos() - dragPos); return; } QPoint clientCursorPos = event->pos(); QRect r = this->rect(); QRect resizeInnerRect(resizeBorderWidth, resizeBorderWidth, r.width() - 2*resizeBorderWidth, r.height() - 2*resizeBorderWidth); if(r.contains(clientCursorPos) && !resizeInnerRect.contains(clientCursorPos)) { //调整窗体大小 ResizeRegion resizeReg = getResizeRegion(clientCursorPos); setResizeCursor(resizeReg); if (m_drag && (event->buttons() & Qt::LeftButton)) { resizeRegion = resizeReg; handleResize(); } } else { //移动窗体 setCursor(Qt::ArrowCursor); if (m_drag && (event->buttons() & Qt::LeftButton)) { m_move = true; move(event->globalPos() - dragPos); } } } void TestDialog::mouseReleaseEvent(QMouseEvent *event) { m_drag = false; if(m_move) { m_move = false; handleMove(event->globalPos()); //鼠标放开后若超出屏幕区域自动吸附于屏幕顶部/左侧/右侧 } resizeRegion = Default; setCursor(Qt::ArrowCursor); } void TestDialog::setResizeCursor(ResizeRegion region) { switch (region) { case North: case South: setCursor(Qt::SizeVerCursor); break; case East: case West: setCursor(Qt::SizeHorCursor); break; case NorthWest: case SouthEast: setCursor(Qt::SizeFDiagCursor); break; default: setCursor(Qt::SizeBDiagCursor); break; } } ResizeRegion TestDialog::getResizeRegion(QPoint clientPos) { if (clientPos.y() <= resizeBorderWidth) { if (clientPos.x() <= resizeBorderWidth) return NorthWest; else if (clientPos.x() >= this->width() - resizeBorderWidth) return NorthEast; else return North; } else if (clientPos.y() >= this->height() - resizeBorderWidth) { if (clientPos.x() <= resizeBorderWidth) return SouthWest; else if (clientPos.x() >= this->width() - resizeBorderWidth) return SouthEast; else return South; } else { if (clientPos.x() <= resizeBorderWidth) return West; else return East; } } void TestDialog::handleMove(QPoint pt) { QPoint currentPos = pt - dragPos; if(currentPos.x()<desktop->x()) { //吸附于屏幕左侧 currentPos.setX(desktop->x()); } else if (currentPos.x()+this->width()>desktop->width()) { //吸附于屏幕右侧 currentPos.setX(desktop->width()-this->width()); } if(currentPos.y()<desktop->y()) { //吸附于屏幕顶部 currentPos.setY(desktop->y()); } move(currentPos); } void TestDialog::handleResize() { int xdiff = QCursor::pos().x() - resizeDownPos.x(); int ydiff = QCursor::pos().y() - resizeDownPos.y(); switch (resizeRegion) { case East: { resize(mouseDownRect.width()+xdiff, this->height()); break; } case West: { resize(mouseDownRect.width()-xdiff, this->height()); move(resizeDownPos.x()+xdiff, this->y()); break; } case South: { resize(this->width(),mouseDownRect.height()+ydiff); break; } case North: { resize(this->width(),mouseDownRect.height()-ydiff); move(this->x(), resizeDownPos.y()+ydiff); break; } case SouthEast: { resize(mouseDownRect.width() + xdiff, mouseDownRect.height() + ydiff); break; } case NorthEast: { resize(mouseDownRect.width()+xdiff, mouseDownRect.height()-ydiff); move(this->x(), resizeDownPos.y()+ydiff); break; } case NorthWest: { resize(mouseDownRect.width()-xdiff, mouseDownRect.height()-ydiff); move(resizeDownPos.x()+xdiff, resizeDownPos.y()+ydiff); break; } case SouthWest: { resize(mouseDownRect.width()-xdiff, mouseDownRect.height()+ydiff); move(resizeDownPos.x()+xdiff, this->y()); break; } } }