104 lines
2.9 KiB
C++
104 lines
2.9 KiB
C++
#include "cropscene.hpp"
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#include <QDebug>
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#include <QGraphicsPolygonItem>
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#include <QGraphicsSceneContextMenuEvent>
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#include <QGraphicsView>
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#include <QMenu>
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#include <QTimer>
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CropScene::CropScene(QObject *parent) : QGraphicsScene(parent), prevButtons(Qt::NoButton)
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{
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QTimer::singleShot(0, [&] {
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QPolygonF poly;
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poly.append(sceneRect().topLeft());
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poly.append(sceneRect().topRight());
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poly.append(sceneRect().bottomRight());
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poly.append(sceneRect().bottomLeft());
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polyItem = new QGraphicsPolygonItem(poly);
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polyItem->setBrush(QBrush(QColor(0, 0, 0, 191)));
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polyItem->setPen(QPen(Qt::NoPen));
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addItem(polyItem);
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});
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}
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void CropScene::mouseMoveEvent(QGraphicsSceneMouseEvent *e)
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{
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auto buttons = e->buttons();
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if (buttons == Qt::LeftButton || prevButtons == Qt::NoButton)
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{
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QPointF p = e->scenePos();
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if (rect == nullptr)
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{
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rect = new QGraphicsRectItem(p.x(), p.y(), 1, 1);
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initPos = p;
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QPen pen(Qt::NoBrush, 1);
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pen.setColor(Qt::cyan);
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rect->setPen(pen);
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addItem(rect);
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}
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else
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{
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if (prevButtons == Qt::NoButton)
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{
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initPos = p;
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rect->setRect(p.x(), p.y(), 1, 1);
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}
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else
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{
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rect->setRect(QRect(qMin(initPos.x(), p.x()), qMin(initPos.y(), p.y()), qAbs(initPos.x() - p.x()),
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qAbs(initPos.y() - p.y())));
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}
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}
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QPolygonF poly;
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QPointF theMagicWikipediaPoint(rect->rect().right(), sceneRect().bottom());
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poly << sceneRect().topLeft();
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poly << sceneRect().topRight();
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poly << sceneRect().bottomRight();
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poly << theMagicWikipediaPoint;
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poly << rect->rect().bottomRight();
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poly << rect->rect().topRight();
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poly << rect->rect().topLeft();
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poly << rect->rect().bottomLeft();
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poly << rect->rect().bottomRight();
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poly << theMagicWikipediaPoint;
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poly << sceneRect().bottomLeft();
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poly << sceneRect().topLeft();
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this->polyItem->setPolygon(poly);
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e->accept();
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}
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else
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QGraphicsScene::mouseMoveEvent(e);
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prevButtons = buttons;
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}
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void CropScene::mouseReleaseEvent(QGraphicsSceneMouseEvent *e)
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{
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prevButtons = Qt::NoButton;
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QGraphicsScene::mouseReleaseEvent(e);
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}
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void CropScene::keyReleaseEvent(QKeyEvent *event)
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{
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if (event->key() == Qt::Key_Return || event->key() == Qt::Key_Enter) done();
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}
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void CropScene::contextMenuEvent(QGraphicsSceneContextMenuEvent *e)
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{
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QMenu menu(e->widget());
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menu.exec(e->screenPos());
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e->accept();
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}
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void CropScene::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *e)
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{
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done();
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QGraphicsScene::mouseDoubleClickEvent(e);
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}
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void CropScene::done()
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{
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if (rect) emit closedWithRect(rect->rect().toRect());
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}
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