QT截图程序，可多屏幕截图二，增加调整截图区域功能

gdizcm

已于 2024-07-07 12:17:25 修改

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分类专栏： QT实用笔记文章标签： qt 动态截图截屏

于 2024-05-29 22:18:04 首次发布

本文链接：https://blog.youkuaiyun.com/gdizcm/article/details/139306506

版权

上一篇QT截图程序，可多屏幕截图只是实现了最基本的截图功能，虽然能用但是缺点也有，没办法更改选中的区域，这在实际使用时不太方便。这篇增加了这个功能。先看看效果。

效果

实现代码为：

头文件

#ifndef MASKWIDGET_H
#define MASKWIDGET_H

#include <QWidget>
#include "mainwindow.h"
namespace Ui {
class MaskWidget;
}
enum SnapState{
    NoSnap,
    Snapped,
    PreLeftDrag,
    LeftDrag,
    PreRightDrag,
    RightDrag,
    PreTopDrag,
    TopDrag,
    PreBottomDrag,
    BottomDrag
};

class MaskWidget : public QWidget
{
    Q_OBJECT

public:
    explicit MaskWidget(QWidget *parent = nullptr);
    ~MaskWidget();
protected:
    void mousePressEvent(QMouseEvent *event)override;
    void mouseReleaseEvent(QMouseEvent *event)override;
    void mouseMoveEvent(QMouseEvent *event)override;
    void paintEvent(QPaintEvent *event)override;
    void keyPressEvent(QKeyEvent *event) override;
    void showEvent(QShowEvent *event) override;

private slots:
    void ResetSnap();

private:
    QPoint m_pressPos;
    QPoint m_newPos;
    QRect m_maskRect{0, 0, 0, 0};
    QPixmap m_image;
    bool isPressed{false};
    MainWindow m;
    SnapState snapstate{NoSnap};
private:
    Ui::MaskWidget *ui;

};

#endif // MASKWIDGET_H

源文件

#include "maskwidget.h"
#include "ui_maskwidget.h"
#include <QMouseEvent>
#include <QRegion>
#include <QScreen>
#include <QPainter>
#include <QGuiApplication>
#include <QPixmap>
#include <QDebug>
#include <QtMath>
#include <QCursor>

const int MINSIZE = 10;

MaskWidget::MaskWidget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::MaskWidget)
{
    ui->setupUi(this);
    setMouseTracking(true);
    setWindowFlags(Qt::FramelessWindowHint);

    setWindowOpacity(0.8);
    QList<QScreen*> screens = QGuiApplication::screens();
    int width = 0;
    int height = 0;
    for (QScreen *screen : screens)
    {
        width += screen->geometry().width();
        if (height < screen->geometry().height())
        {
            height = screen->geometry().height();
        }
        qDebug()<<screen->geometry();
    }
    this->setFixedSize(width, height);

    m.hide();

    connect(&m, SIGNAL(resetSnap()), this, SLOT(ResetSnap()));
}

MaskWidget::~MaskWidget()
{
    delete ui;
}

void MaskWidget::mousePressEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton)
    {
        if (m_maskRect.width() == 0 && m_maskRect.width() == 0)
        {
            m_pressPos = event->pos();
            this->setCursor(Qt::CrossCursor);
            isPressed = true;
            update();
        }

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