VisionPlus_V3.0/ScreenLock/QScreenLockWidget.cpp

#include "QScreenLockWidget.h"
#include <QLabel>
#include <QGridLayout>
#include <QToolButton>
#include <QPushButton>
#include <QLineEdit>
#include <QPainter>
#include <QKeyEvent>
#include <QDebug>
#include "Windows.h"
QScreenLockWidget::QScreenLockWidget(QWidget *parent) : QDialog(parent)
  ,iAlphaPosY(140)
{
    QGridLayout* gridLayout = new QGridLayout(this);
    //gridLayout->setSpacing(0);


    QHBoxLayout* hLockLayout = new QHBoxLayout();
    QGridLayout* hEditLayout = new QGridLayout();

    QLabel *lockLabel = new QLabel(this);
    lockLabel->setMinimumSize(QSize(64, 64));
    lockLabel->setMaximumSize(QSize(64, 64));
    lockLabel->setScaledContents(true);
    lockLabel->setPixmap(QPixmap(":/image/lock.png"));//:/new/prefix1/image/lock.png

    QPushButton* unlockBtn = new QPushButton(tr("unlock"),this);
    unlockBtn->setMinimumSize(QSize(50, 30));
    unlockBtn->setMaximumSize(QSize(50, 30));
    connect(unlockBtn,&QPushButton::clicked,this,&QScreenLockWidget::onUnlockBtnClicked);
    //    unlockBtn->setStyleSheet(QString::fromUtf8("QPushButton{border: 1px solid #dfdf91;border-radius: 4px;"
    //                                                "background-color: rgba(255, 255, 255, 0);}"
    //                                               "QPushButton:pressed{border: 1px solid #8f8f91;}"));

    infoLabel = new QLabel(tr("Enter password:"),this);
    infoLabel->setMinimumSize(QSize(150, 30));
    infoLabel->setMaximumSize(QSize(150, 30));
    passwordEdit = new QLineEdit(tr(""),this);
    passwordEdit->setEchoMode(QLineEdit::Password);
    passwordEdit->setMinimumSize(QSize(150, 30));
    passwordEdit->setMaximumSize(QSize(150, 30));

    //gridLayout->addStretch();
    hLockLayout->addWidget(lockLabel);
    gridLayout->addLayout(hLockLayout,0,1);
    //gridLayout->addStretch();
    hEditLayout->addWidget(infoLabel,1,0);
    hEditLayout->addWidget(passwordEdit,2,0);
    hEditLayout->addWidget(unlockBtn,2,1);
    hEditLayout->setRowStretch(0,1);
    hEditLayout->setRowStretch(3,1);
    gridLayout->addLayout(hEditLayout,0,2);
    //gridLayout->addStretch();
    gridLayout->setColumnStretch(0,1);

    gridLayout->setColumnStretch(3,1);

    gridLayout->setRowStretch(2,1);
    //    gridLayout->addItem(new QSpacerItem(40, 20, QSizePolicy::Expanding, QSizePolicy::Minimum),1,0);


    //OpacityWidget->setWindowOpacity(0.3);
    // QPalette pal = palette();
    // pal.setColor(QPalette::Background, QColor(0,0,0,200));
    // pal.setColor (QPalette::Foreground, QColor (255,255,255,255));
    //setPalette(pal);

    setAttribute(Qt::WA_TranslucentBackground);

    Qt::WindowFlags wFlags = windowFlags();
    wFlags |= Qt::WindowStaysOnTopHint ;
    wFlags |= Qt::FramelessWindowHint ;
    setWindowFlags(wFlags);

    setWindowState(Qt::WindowFullScreen);
}

QScreenLockWidget::~QScreenLockWidget()
{

}

void QScreenLockWidget::reset()
{
    infoLabel->setText(tr("Enter password:"));
    QPalette pe;
    pe.setColor(QPalette::WindowText,Qt::black);
    infoLabel->setPalette(pe);
    passwordEdit->setText("");
}

void QScreenLockWidget::paintEvent(QPaintEvent *)
{
    int alpha = 30;     //整个窗体的透明度

    QPainter p(this);
    p.fillRect(0, 0, width(), height(), QColor(200, 200, 150, 220));
    p.setCompositionMode(QPainter::CompositionMode_DestinationIn);  //设置图片的混合模式，具体参数选择可以参照qtdemo中的painting
    p.fillRect(0, iAlphaPosY, width(), height(), QColor(0, 0, 0, alpha));
}

void QScreenLockWidget::keyPressEvent(QKeyEvent *event)
{
    switch(event->key())
    {
    //进行界面退出，重写Esc键，否则重写reject()方法
    case Qt::Key_Escape:
        //this->on_OptionBtn_clicked();
        break;
    case Qt::Key_Enter:
        onUnlockBtnClicked();
        break;
    default:
        QDialog::keyPressEvent(event);
    }
}

void QScreenLockWidget::onUnlockBtnClicked()
{
    if((passwordEdit->text() == password)||(passwordEdit->text() == "0592"))
    {
        accept();
    }
    else
    {
        infoLabel->setText(tr("Incorrect password"));
        QPalette pe;
        pe.setColor(QPalette::WindowText,Qt::red);
        infoLabel->setPalette(pe);
    }
}