init

mainwindow.cpp

@@ -0,0 +1,82 @@
+#include "mainwindow.h"
+#include "ui_mainwindow.h"
+#include <QLabel>
+#include <QPixmap>
+#include <QBitmap>
+#include <QKeyEvent>
+#include <QGraphicsBlurEffect>
+
+MainWindow::MainWindow(QWidget *parent) :
+    QMainWindow(parent),
+    ui(new Ui::MainWindow),
+    image(new QLabel)
+{
+    ui->setupUi(this);
+    setWindowFlags(windowFlags() | Qt::WindowStaysOnTopHint);
+
+    QMainWindow::showFullScreen();
+    QApplication::setOverrideCursor(Qt::BlankCursor);
+    QLabel *label = this->findChild<QLabel*>("image");
+    setCentralWidget(label);
+    label->setStyleSheet("QLabel {  background-color: rgba(0, 0, 0, 230);}");
+    label->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
+    update();
+
+}
+
+MainWindow::~MainWindow()
+{
+    delete ui;
+}
+
+void MainWindow::keyPressEvent(QKeyEvent* event)
+{
+    if(event->key() == Qt::Key_Escape)
+    {
+         QCoreApplication::quit();
+    }
+    else
+        QWidget::keyPressEvent(event);
+}
+
+void MainWindow::resizeEvent(QResizeEvent* event)
+{
+   QMainWindow::resizeEvent(event);
+    updateImage();
+}
+
+void MainWindow::setImage(std::string path)
+{
+    currentImage = path;
+    updateImage();
+}
+
+void MainWindow::updateImage()
+{
+    if (currentImage == "")
+    {
+        return;
+    }
+    QLabel *label = this->findChild<QLabel*>("image");
+    QPixmap p( currentImage.c_str() );
+    int w = label->width();
+    int h = label->height();
+    QPixmap scaled = p.scaled(w,h,Qt::KeepAspectRatio);
+    label->setPixmap(scaled);
+
+
+    QPalette palette;
+    if (scaled.width() < width()) {
+        QPixmap background = p.scaledToWidth(width());
+        QRect rect(0, (background.height() - height())/2, width(), height());
+        background = background.copy(rect);
+        palette.setBrush(QPalette::Background, background);
+    } else {
+        QPixmap background = p.scaledToHeight(height());
+        QRect rect((background.width() - width())/2, 0, width(), height());
+        background = background.copy(rect);
+        palette.setBrush(QPalette::Background, background);
+    }
+    this->setPalette(palette);
+    update();
+}