#!/usr/bin/python
# -*- coding:utf-8 -*-
""" auto wrap layout
"""

from PyQt5.QtCore import QPoint, QRect, QSize, Qt
from PyQt5.QtWidgets import (QApplication, QLayout, QPushButton, QSizePolicy, QWidget)


class QFlowLayout(QLayout):
    def __init__(self, parent=None, margin=0, spacing=-1):
        super(QFlowLayout, self).__init__(parent)
        if parent is not None:
            self.setContentsMargins(margin, margin, margin, margin)
        self.setSpacing(spacing)
        self.itemList = []

    def __del__(self):
        item = self.takeAt(0)
        while item:
            item = self.takeAt(0)

    def addItem(self, item):
        self.itemList.append(item)

    def removeItem(self, item):
        self.itemList.remove(item)
        item.widget().deleteLater()
        del item

    def count(self):
        return len(self.itemList)

    def itemAt(self, index):
        if 0 <= index < len(self.itemList):
            return self.itemList[index]
        return None

    def takeAt(self, index):
        if 0 <= index < len(self.itemList):
            return self.itemList.pop(index)
        return None

    def expandingDirections(self):
        return Qt.Orientations(Qt.Orientation(0))

    @staticmethod
    def hasHeightForWidth():
        return True

    def heightForWidth(self, width):
        height = self.doLayout(QRect(0, 0, width, 0), True)
        return height

    def setGeometry(self, rect):
        super(QFlowLayout, self).setGeometry(rect)
        self.doLayout(rect, False)

    def sizeHint(self):
        return self.minimumSize()

    def minimumSize(self):
        size = QSize()
        for item in self.itemList:
            size = size.expandedTo(item.minimumSize())
        margin, _, _, _ = self.getContentsMargins()
        size += QSize(2 * margin, 2 * margin)
        return size

    def doLayout(self, rect, testOnly):
        x = rect.x()
        y = rect.y()
        lineHeight = 0
        for item in self.itemList:
            wid = item.widget()
            spaceX = self.spacing() + wid.style().layoutSpacing(QSizePolicy.PushButton, QSizePolicy.PushButton,
                                                                Qt.Horizontal)
            spaceY = self.spacing() + wid.style().layoutSpacing(QSizePolicy.PushButton, QSizePolicy.PushButton,
                                                                Qt.Vertical)
            nextX = x + item.sizeHint().width() + spaceX
            if nextX - spaceX > rect.right() and lineHeight > 0:
                x = rect.x()
                y = y + lineHeight + spaceY
                nextX = x + item.sizeHint().width() + spaceX
                lineHeight = 0
            if not testOnly:
                item.setGeometry(QRect(QPoint(x, y), item.sizeHint()))
            x = nextX
            lineHeight = max(lineHeight, item.sizeHint().height())
        return y + lineHeight - rect.y()


if __name__ == '__main__':

    class Window(QWidget):
        def __init__(self):
            super(Window, self).__init__()
            flowLayout = QFlowLayout()
            flowLayout.addWidget(QPushButton("Short"))
            flowLayout.addWidget(QPushButton("Longer"))
            flowLayout.addWidget(QPushButton("Different text"))
            flowLayout.addWidget(QPushButton("More text"))
            flowLayout.addWidget(QPushButton("Even longer button text"))
            self.setLayout(flowLayout)
            self.setWindowTitle("Flow Layout")

    import sys
    app = QApplication(sys.argv)
    mainWin = Window()
    mainWin.show()
    sys.exit(app.exec_())