qt5 遮罩背景 灰色遮罩层实现

#if _MSC_VER >= 1600 #pragma execution_character_set("utf-8") #endif #include "screenwidget.h" #include "qapplication.h" #include "qpainter.h" #include "qdesktopwidget.h" #include "qfiledialog.h" #include "qevent.h" #include "qdatetime.h" #include "qstringlist.h" #if (QT_VERSION > QT_VERSION_CHECK(5,0,0)) #include "qscreen.h" #endif #define AppPath qApp->applicationDirPath() #define STRDATETIME qPrintable (QDateTime::currentDateTime().toString("yyyy-MM-dd-HH-mm-ss")) Screen::Screen(QSize size) { maxWidth = size.width(); maxHeight = size.height(); startPos = QPoint(-1, -1); endPos = startPos; leftUpPos = startPos; rightDownPos = startPos; status = SELECT; } int Screen::width() { return maxWidth; } int Screen::height() { return maxHeight; } Screen::STATUS Screen::getStatus() { return status; } void Screen::setStatus(STATUS status) { this->status = status; } void Screen::setEnd(QPoint pos) { endPos = pos; leftUpPos = startPos; rightDownPos = endPos; cmpPoint(leftUpPos, rightDownPos); } void Screen::setStart(QPoint pos) { startPos = pos; } QPoint Screen::getEnd() { return endPos; } QPoint Screen::getStart() { return startPos; } QPoint Screen::getLeftUp() { return leftUpPos; } QPoint Screen::getRightDown() { return rightDownPos; } bool Screen::isInArea(QPoint pos) { if (pos.x() > leftUpPos.x() && pos.x() < rightDownPos.x() && pos.y() > leftUpPos.y() && pos.y() < rightDownPos.y()) { return true; } return false; } void Screen::move(QPoint p) { int lx = leftUpPos.x() + p.x(); int ly = leftUpPos.y() + p.y(); int rx = rightDownPos.x() + p.x(); int ry = rightDownPos.y() + p.y(); if (lx < 0) { lx = 0; rx -= p.x(); } if (ly < 0) { ly = 0; ry -= p.y(); } if (rx > maxWidth) { rx = maxWidth; lx -= p.x(); } if (ry > maxHeight) { ry = maxHeight; ly -= p.y(); } leftUpPos = QPoint(lx, ly); rightDownPos = QPoint(rx, ry); startPos = leftUpPos; endPos = rightDownPos; } void Screen::cmpPoint(QPoint &leftTop, QPoint &rightDown) { QPoint l = leftTop; QPoint r = rightDown; if (l.x() <= r.x()) { if (l.y() <= r.y()) { ; } else { leftTop.setY(r.y()); rightDown.setY(l.y()); } } else { if (l.y() < r.y()) { leftTop.setX(r.x()); rightDown.setX(l.x()); } else { QPoint tmp; tmp = leftTop; leftTop = rightDown; rightDown = tmp; } } } ScreenWidget *ScreenWidget::self = 0; ScreenWidget::ScreenWidget(QWidget *parent) : QWidget(parent) { this->initForm(); showFullScreen(); } void ScreenWidget::initForm() { this->setWindowFlags(Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint); menu = new QMenu(this); menu->addAction("保存截图", this, SLOT(saveScreen())); menu->addAction("截图另存为", this, SLOT(saveScreenOther())); menu->addAction("全屏截图", this, SLOT(saveFullScreen())); menu->addAction("退出截图", this, SLOT(hide())); //取得屏幕大小 screen = new Screen(QApplication::desktop()->size()); //保存全屏图像 fullScreen = new QPixmap(); } void ScreenWidget::paintEvent(QPaintEvent *) { int x = screen->getLeftUp().x(); int y = screen->getLeftUp().y(); int w = screen->getRightDown().x() - x; int h = screen->getRightDown().y() - y; QPainter painter(this); QPen pen; pen.setColor(Qt::green); pen.setWidth(2); pen.setStyle(Qt::DotLine); painter.setPen(pen); QFont font; font.setFamily("Microsoft YaHei"); font.setPointSize(10); painter.setFont(font); painter.drawPixmap(0, 0, *bgScreen); if (w != 0 && h != 0) { painter.drawPixmap(x, y, fullScreen->copy(x, y, w, h)); } painter.drawRect(x, y, w, h); pen.setColor(Qt::yellow); painter.setPen(pen); painter.drawText(x + 2, y - 8, tr("截图范围：( %1 x %2 ) - ( %3 x %4 ) 图片大小：( %5 x %6 )") .arg(x).arg(y).arg(x + w).arg(y + h).arg(w).arg(h)); } void ScreenWidget::showEvent(QShowEvent *) { QPoint point(-1, -1); screen->setStart(point); screen->setEnd(point); #if (QT_VERSION <= QT_VERSION_CHECK(5,0,0)) *fullScreen = fullScreen->grabWindow(QApplication::desktop()->winId(), 0, 0, screen->width(), screen->height()); #else QScreen *pscreen = QApplication::primaryScreen(); *fullScreen = pscreen->grabWindow(QApplication::desktop()->winId(), 0, 0, screen->width(), screen->height()); #endif //设置透明度实现模糊背景 QPixmap pix(screen->width(), screen->height()); pix.fill((QColor(160, 160, 160, 200))); bgScreen = new QPixmap(*fullScreen); QPainter p(bgScreen); p.drawPixmap(0, 0, pix); } void ScreenWidget::saveScreenOther() { QString fileName = QFileDialog::getSaveFileName(this, "保存图片", STRDATETIME, "JPEG Files (*.jpg)"); if (fileName.length() > 0) { int x = screen->getLeftUp().x(); int y = screen->getLeftUp().y(); int w = screen->getRightDown().x() - x; int h = screen->getRightDown().y() - y; fullScreen->copy(x, y, w, h).save(fileName, "jpg"); close(); } } void ScreenWidget::saveScreen() { int x = screen->getLeftUp().x(); int y = screen->getLeftUp().y(); int w = screen->getRightDown().x() - x; int h = screen->getRightDown().y() - y; QString fileName = QString("%1/screen_%2.jpg").arg(AppPath).arg(STRDATETIME); fullScreen->copy(x, y, w, h).save(fileName, "jpg"); close(); } void ScreenWidget::saveFullScreen() { QString fileName = QString("%1/full_%2.jpg").arg(AppPath).arg(STRDATETIME); fullScreen->save(fileName, "jpg"); close(); } void ScreenWidget::mouseMoveEvent(QMouseEvent *e) { if (screen->getStatus() == Screen::SELECT) { screen->setEnd(e->pos()); } else if (screen->getStatus() == Screen::MOV) { QPoint p(e->x() - movPos.x(), e->y() - movPos.y()); screen->move(p); movPos = e->pos(); } update(); } void ScreenWidget::mousePressEvent(QMouseEvent *e) { int status = screen->getStatus(); if (status == Screen::SELECT) { screen->setStart(e->pos()); } else if (status == Screen::MOV) { if (screen->isInArea(e->pos()) == false) { screen->setStart(e->pos()); screen->setStatus(Screen::SELECT); } else { movPos = e->pos(); this->setCursor(Qt::SizeAllCursor); } } update(); } void ScreenWidget::mouseReleaseEvent(QMouseEvent *) { if (screen->getStatus() == Screen::SELECT) { screen->setStatus(Screen::MOV); } else if (screen->getStatus() == Screen::MOV) { this->setCursor(Qt::ArrowCursor); } } void ScreenWidget::contextMenuEvent(QContextMenuEvent *) { this->setCursor(Qt::ArrowCursor); menu->exec(cursor().pos()); }