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123 lines
4 KiB
Python
123 lines
4 KiB
Python
# This file is part of BeeRef.
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#
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# BeeRef is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# BeeRef is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with BeeRef. If not, see <https://www.gnu.org/licenses/>.
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"""Classes for items that are added to the scene by the user (images,
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text).
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"""
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import base64
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import logging
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from PyQt6 import QtCore, QtGui, QtWidgets
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from beeref.selection import SelectionItem
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logger = logging.getLogger('BeeRef')
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class BeePixmapItem(QtWidgets.QGraphicsPixmapItem):
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"""Class for images added by the user."""
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def __init__(self, image, filename=None):
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super().__init__(QtGui.QPixmap.fromImage(image))
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logger.debug(f'Initialized image "{filename}" with dimensions: '
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f'{self.width} x {self.height} at index {self.zValue()}')
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self.filename = filename
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self.scale_factor = 1
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self.setFlags(
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QtWidgets.QGraphicsItem.GraphicsItemFlags.ItemIsMovable
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| QtWidgets.QGraphicsItem.GraphicsItemFlags.ItemIsSelectable)
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def setScale(self, factor):
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self.scale_factor = factor
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logger.debug(f'Setting scale for image "{self.filename}" to {factor}')
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super().setScale(factor)
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def set_pos_center(self, x, y):
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"""Sets the position using the item's center as the origin point."""
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self.setPos(x - self.width * self.scale_factor / 2,
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y - self.height * self.scale_factor / 2)
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@property
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def width(self):
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return self.pixmap().size().width()
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@property
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def height(self):
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return self.pixmap().size().height()
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def pixmap_to_str(self):
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"""Convert the pixmap data to a base64-encoded PNG for saving."""
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barray = QtCore.QByteArray()
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buffer = QtCore.QBuffer(barray)
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buffer.open(QtCore.QIODevice.OpenMode.WriteOnly)
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img = self.pixmap().toImage()
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img.save(buffer, 'PNG')
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data = base64.b64encode(barray.data())
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return data.decode('ascii')
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@classmethod
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def qimage_from_str(self, data):
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"""Read the image date from a base64-encoded PNG for loading."""
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img = QtGui.QImage()
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img.loadFromData(base64.b64decode(data))
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return img
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def to_bee_json(self):
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"""For saving the item to BeeRefs native file format."""
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return {
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'cls': self.__class__.__name__,
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'scale': self.scale_factor,
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'pixmap': self.pixmap_to_str(),
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'pos': [self.pos().x(), self.pos().y()],
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'z': self.zValue(),
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'filename': self.filename,
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}
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@classmethod
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def from_bee_json(cls, obj):
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"""For loading an item from BeeRefs native file format."""
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img = cls.qimage_from_str(obj['pixmap'])
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item = cls(img, filename=obj.get('filename'))
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if 'scale' in obj:
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item.setScale(obj['scale'])
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if 'pos' in obj:
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item.setPos(*obj['pos'])
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if 'z' in obj:
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item.setZValue(obj['z'])
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return item
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def activate_selection(self):
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if self.childItems():
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self.childItems()[0].setVisible(True)
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else:
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SelectionItem(self)
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def clear_selection(self):
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self.childItems()[0].setVisible(False)
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def itemChange(self, change, value):
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if change == self.GraphicsItemChange.ItemSelectedChange:
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if value:
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logger.debug(f'Item selected {self.filename}')
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self.activate_selection()
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else:
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logger.debug(f'Item deselected {self.filename}')
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self.clear_selection()
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return super().itemChange(change, value)
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