pfborderimage.h

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// Copyright (c) 2019 The PIVX Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#ifndef PIVX_QT_PFBORDERIMAGE_H
#define PIVX_QT_PFBORDERIMAGE_H
 
#include <QPainter>
#include <QPixmap>
#include <QWidget>
#include <QFrame>
 
class PFBorderImage : public QFrame
{
    Q_OBJECT
 
public:
    explicit PFBorderImage(QWidget *parent = nullptr) : QFrame(parent) {};
    ~PFBorderImage() {};
 
#if defined(Q_OS_MAC)
 
    void load(QString path) {
        if (img.isNull() && !path.isNull()) img = QPixmap(path);
    }
 
protected:
 
    void paintEvent(QPaintEvent *event) override {
        QSize currentSize = size();
        if (cachedSize != currentSize && checkSize(currentSize)) {
            cachedSize = currentSize;
            scaledImg = img.scaled(cachedSize);
        }
        QPainter painter(this);
        painter.drawPixmap(0, 0, scaledImg);
        QWidget::paintEvent(event);
    }
 
    bool checkSize(QSize currentSize) {
        // Do not scale the image if the window change are imperceptible for the human's eye.
        int pixelatedImageValue = 50;
        return (currentSize.width() > cachedSize.width() + pixelatedImageValue) || (currentSize.width() < cachedSize.width() - pixelatedImageValue)
                || (currentSize.height() > cachedSize.height() + pixelatedImageValue) || (currentSize.height() < cachedSize.height() - pixelatedImageValue);
    }
 
    QPixmap img;
    QPixmap scaledImg;
    QSize cachedSize;
 
#endif
 
};
 
#endif // PIVX_QT_PFBORDERIMAGE_H