HYTOS

import os.path

import AbstractCommand

try:

    from PyQt5.QtCore import Qt, QRectF, pyqtSignal, QT_VERSION_STR

    from PyQt5.QtGui import QImage, QPixmap, QPainterPath

    from PyQt5.QtWidgets import QGraphicsView, QGraphicsScene, QFileDialog

except ImportError:

    try:

        from PyQt4.QtCore import Qt, QRectF, pyqtSignal, QT_VERSION_STR

        from PyQt4.QtGui import QGraphicsView, QGraphicsScene, QImage, QPixmap, QPainterPath, QFileDialog

    except ImportError:

        raise ImportError("ImageViewerQt: Requires PyQt5 or PyQt4.")

class CropCommand(AbstractCommand.AbstractCommand):

    def __init__(self, imageViewer):

        super(CropCommand, self).__init__(imageViewer)

        self.name = 'Crop' 

    '''

        @brief  crop image by rectangle selected by user

    '''

    def execute(self, param):

        event = param[1]

        scenePos = param[2]

        if 'mousePressEvent' == param[0] and event.button() == Qt.LeftButton:

            self.imageViewer.setDragMode(QGraphicsView.RubberBandDrag)

            self.imageViewer.leftMouseButtonPressed.emit(scenePos.x(), scenePos.y())

            #QGraphicsView.mousePressEvent(self.imageViewer, event)

        elif 'mouseReleaseEvent' == param[0] and event.button() == Qt.LeftButton:

            try:

                viewBBox = self.imageViewer.zoomStack[-1] if len(self.imageViewer.zoomStack) else self.imageViewer.sceneRect()

                selectionBBox = self.imageViewer.scene.selectionArea().boundingRect().intersected(viewBBox)

                if selectionBBox.isValid():

                    croppedImage = self.imageViewer.image().copy(selectionBBox.toAlignedRect())

                    self.imageViewer.setImage(croppedImage)

                self.imageViewer.setDragMode(QGraphicsView.NoDrag)

            finally:

                self.imageViewer.leftMouseButtonReleased.emit(scenePos.x(), scenePos.y())

                #QGraphicsView.mouseReleaseEvent(self.imageViewer, event)

                pass

        self.isTreated = False

    def undo(self):

        pass

    def redo(self):

        pass