[Qt]Qt实现简易截图工具

#include "screencapturedlg.h" #include "ui_screencapturedlg.h" ScreenCaptureDlg::ScreenCaptureDlg(QWidget *parent) : QMainWindow(parent) , ui(new Ui::ScreenCaptureDlg) { ui->setupUi(this); //初始化数据 Init_Data(); } ScreenCaptureDlg::~ScreenCaptureDlg() { delete ui; } //初始化数据 ScreenCaptureDlg::Init_Data() { this->setWindowFlag(Qt::FramelessWindowHint); this->setAttribute(Qt::WA_TranslucentBackground); this->setFocusPolicy(Qt::StrongFocus); m_timer = new QTimer(this); connect(m_timer, &QTimer::timeout, this, &ScreenCaptureDlg::MouseShape); m_timer->start(200); // 置顶 ::SetWindowPos(HWND(this->winId()), HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW); //开始截图 { QScreen *pScreen = QGuiApplication::primaryScreen(); m_pixmap = pScreen->grabWindow(0); this->setGeometry(0, 0, m_pixmap.width(), m_pixmap.height()); } //先定义一个QAction的对象. QAction *action_Save_to_clipboard = new QAction(this); //设置触发QAction对象的快捷操作. action_Save_to_clipboard->setShortcut(tr("Ctrl+x")); //全选 //把这个QAction的对象加入到tableWidget addAction(action_Save_to_clipboard); //连接信号与槽.连接好了以后，当你按下ctrl+o时，就会调用槽函数，也就是这里自定义的openfile()函数; connect(action_Save_to_clipboard, &QAction::triggered, this, &ScreenCaptureDlg::addAction_clicked); } void ScreenCaptureDlg::paintEvent(QPaintEvent *event) { QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing); QRect rect; rect.setWidth(this->geometry().width()); rect.setHeight(this->geometry().height()); painter.drawPixmap(rect, m_pixmap); //画一圈红色的外框 painter.setPen(QPen(QColor(255, 0, 0))); painter.drawRect(m_selectRect); painter.setBrush(QBrush(QColor(0, 0, 0, 150))); painter.setPen(Qt::NoPen); //鼠标绘制的矩形框外为半透明灰色，框内为白色 QPainterPath path; path.setFillRule(Qt::OddEvenFill); path.addRect(rect); path.addRect(m_selectRect); painter.drawPath(path); //显示截取区域信息 { if(PressFalg == 1) { //截取区域大小信息 QString pixmap_size = QString("%1").arg(Unsigned_selectRect.width()).replace("-","") + " X " + QString("%1").arg(Unsigned_selectRect.height()).replace("-","") + "（按ESC退出截图，按Enter保存截图，按Ctrl+X复制到剪切板）"; QColor information_color = QColor(0, 0, 0, 150); painter.setPen(QColor(Qt::red)); QFont font("黑体", 14, QFont::Bold, true); //使用字体 painter.setFont(font); QFontMetrics fm(painter.font()); QRect fm_rect = fm.boundingRect(pixmap_size); QRect pixmap_size_rect(Unsigned_selectRect.topLeft().x(), Unsigned_selectRect.topLeft().y() -25, fm_rect.width() + 10, 25); painter.fillRect(pixmap_size_rect, information_color); painter.drawText(pixmap_size_rect,Qt::AlignCenter, pixmap_size); } } if(PressFalg == 1) { //中间画一个小矩形来模拟数据位置 painter.setPen(QPen(QColor(255, 0, 0))); painter.drawRect(m_selectRect.x() + m_selectRect.width()/2,m_selectRect.y()-10,20,20); painter.drawRect(m_selectRect.x()-10,m_selectRect.y() + m_selectRect.height()/2,20,20); painter.drawRect(m_selectRect.x() + m_selectRect.width()/2,m_selectRect.y() + m_selectRect.height()-10,20,20); painter.drawRect(m_selectRect.x() + m_selectRect.width()-10,m_selectRect.y() + m_selectRect.height()/2,20,20); } //绘制结束 painter.end(); } void ScreenCaptureDlg::resizeEvent(QResizeEvent *event) { } void ScreenCaptureDlg::mousePressEvent(QMouseEvent *event) { PressFalg = 1; m_pressPos = event->pos(); if(DrawFalg == 0) { m_selectRect.setTopLeft(event->pos()); m_selectRect.setWidth(0); m_selectRect.setHeight(0); update(); } if(DrawFalg == 1) { if((m_pressPos.x() > m_selectRect.x()+10 && m_pressPos.x()< m_selectRect.x() + m_selectRect.width()-10) && (m_pressPos.y() > m_selectRect.y()+10 && m_pressPos.y() < m_selectRect.y() + m_selectRect.height()-10)) { setCursor(Qt::OpenHandCursor); MoveFalg = 0; selectRect_Point.setX(m_selectRect.x()); selectRect_Point.setY(m_selectRect.y()); movePoint = event->globalPos() - selectRect_Point; } //上 if(((m_pressPos.x() >= m_selectRect.x() + m_selectRect.width()/2 - 10 && m_pressPos.x()<= m_selectRect.x() + m_selectRect.width()/2 + 10) &&((m_pressPos.y() >= m_selectRect.y()-10 && m_pressPos.y()<= m_selectRect.y()+10)))) { setCursor(Qt::SizeVerCursor); UppeFalg = 1; } //左 if(((m_pressPos.x() >= m_selectRect.x()-10 && m_pressPos.x()<= m_selectRect.x()+10) &&((m_pressPos.y() >= m_selectRect.y() + m_selectRect.height()/2-10 && m_pressPos.y()<= m_selectRect.y() + m_selectRect.height()/2+10)))) { setCursor(Qt::SizeHorCursor); LeftFalg = 1; } //下 if(((m_pressPos.x() >= m_selectRect.x() + m_selectRect.width()/2 -10 && m_pressPos.x()<= m_selectRect.x() + m_selectRect.width()/2 +10) &&((m_pressPos.y() >= m_selectRect.y() + m_selectRect.height()-10 && m_pressPos.y()<= m_selectRect.y() + m_selectRect.height()+10)))) { setCursor(Qt::SizeVerCursor); lowerFalg = 1; } //右 if(((m_pressPos.x() >= m_selectRect.x() + m_selectRect.width()-10 && m_pressPos.x()<= m_selectRect.x() + m_selectRect.width()+10) &&((m_pressPos.y() >= m_selectRect.y() + m_selectRect.height()/2-10 && m_pressPos.y()<= m_selectRect.y() + m_selectRect.height()/2+10)))) { setCursor(Qt::SizeHorCursor); RightFalg = 1; } } } void ScreenCaptureDlg::mouseMoveEvent(QMouseEvent *event) { Unsigned_selectRect = m_selectRect; if(m_width < 0) { QPoint mypoint = QPoint(m_selectRect.x() + m_selectRect.width(), m_selectRect.y()); Unsigned_selectRect.setTopLeft(mypoint); Unsigned_selectRect.setWidth(QString("%1").arg(m_width).replace("-","").toInt()); update(); } if(m_height < 0) { QPoint mypoint = QPoint(m_selectRect.x(), m_selectRect.y() + m_selectRect.height()); Unsigned_selectRect.setTopLeft(mypoint); Unsigned_selectRect.setHeight(QString("%1").arg(m_height).replace("-","").toInt()); update(); } if(DrawFalg == 0) { m_width = event->pos().x() - m_pressPos.x(); m_height = event->pos().y() - m_pressPos.y(); m_selectRect.setWidth(m_width); m_selectRect.setHeight(m_height); update(); } if(DrawFalg == 1) { if(MoveFalg == 0) { QPoint movePos = event->globalPos(); QPoint m_Point = movePos-movePoint; if((m_Point.x() >= 0 && m_Point.y() >= 0) && (m_Point.x() + m_selectRect.width() <= m_pixmap.width() && m_Point.y() + m_selectRect.height() <= m_pixmap.height())) { m_selectRect.setTopLeft(m_Point); m_selectRect.setWidth(m_width); m_selectRect.setHeight(m_height); update(); } } if(UppeFalg == 1) { m_Point = QPoint(m_s