Qt Utils

utils.py

import sys

from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *


def rect_scale(source, target, aspect=Qt.IgnoreAspectRatio):
    """缩放
        source 待缩放
        target 目标
    """

    ratio = source.width() / source.height()
    tgt_ratio = target.width() / target.height()

    if aspect == Qt.IgnoreAspectRatio:
        width = target.width()
        height = target.height()
    else:
        if ratio > tgt_ratio or aspect == Qt.KeepAspectRatioByExpanding:
            width = target.width()
            height = width / ratio
        else:
            height = target.height()
            width = height * ratio

    return QRectF(source.x(), source.y(), width, height)


def rect_align(source, target, align=Qt.AlignCenter):
    src = QRectF(source)

    if align & Qt.AlignHCenter:
        src.moveCenter(QPointF(target.center().x(), src.center().y()))

    if align & Qt.AlignVCenter:
        src.moveCenter(QPointF(src.center().x(), target.center().y()))

    if align & Qt.AlignLeft:
        src.moveLeft(target.left())

    if align & Qt.AlignTop:
        src.moveTop(target.top())

    if align & Qt.AlignRight:
        src.moveRight(target.right())

    if align & Qt.AlignBottom:
        src.moveBottom(target.bottom())

    return src