forked from M-Labs/artiq
132 lines
4.5 KiB
Python
132 lines
4.5 KiB
Python
#############################################################################
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##
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## Copyright (C) 2013 Riverbank Computing Limited.
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## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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## All rights reserved.
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##
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## This file is part of the examples of PyQt.
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##
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## $QT_BEGIN_LICENSE:BSD$
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## You may use this file under the terms of the BSD license as follows:
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##
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## "Redistribution and use in source and binary forms, with or without
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## modification, are permitted provided that the following conditions are
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## met:
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## * Redistributions of source code must retain the above copyright
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## notice, this list of conditions and the following disclaimer.
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## * Redistributions in binary form must reproduce the above copyright
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## notice, this list of conditions and the following disclaimer in
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## the documentation and/or other materials provided with the
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## distribution.
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## * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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## the names of its contributors may be used to endorse or promote
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## products derived from this software without specific prior written
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## permission.
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##
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## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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## $QT_END_LICENSE$
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##
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#############################################################################
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from PyQt5.QtCore import QPoint, QRect, QSize, Qt
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from PyQt5.QtWidgets import (QApplication, QLayout, QPushButton, QSizePolicy,
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QWidget)
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class FlowLayout(QLayout):
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def __init__(self, parent=None, margin=0, spacing=-1):
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super(FlowLayout, self).__init__(parent)
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if parent is not None:
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self.setContentsMargins(margin, margin, margin, margin)
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self.setSpacing(spacing)
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self.itemList = []
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def __del__(self):
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item = self.takeAt(0)
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while item:
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item = self.takeAt(0)
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def addItem(self, item):
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self.itemList.append(item)
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def count(self):
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return len(self.itemList)
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def itemAt(self, index):
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if index >= 0 and index < len(self.itemList):
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return self.itemList[index]
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return None
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def takeAt(self, index):
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if index >= 0 and index < len(self.itemList):
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return self.itemList.pop(index)
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return None
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def expandingDirections(self):
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return Qt.Orientations(Qt.Orientation(0))
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def hasHeightForWidth(self):
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return True
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def heightForWidth(self, width):
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height = self.doLayout(QRect(0, 0, width, 0), True)
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return height
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def setGeometry(self, rect):
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super(FlowLayout, self).setGeometry(rect)
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self.doLayout(rect, False)
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def sizeHint(self):
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return self.minimumSize()
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def minimumSize(self):
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size = QSize()
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for item in self.itemList:
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size = size.expandedTo(item.minimumSize())
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margin, _, _, _ = self.getContentsMargins()
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size += QSize(2 * margin, 2 * margin)
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return size
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def doLayout(self, rect, testOnly):
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x = rect.x()
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y = rect.y()
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lineHeight = 0
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for item in self.itemList:
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wid = item.widget()
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spaceX = self.spacing() + wid.style().layoutSpacing(QSizePolicy.PushButton, QSizePolicy.PushButton, Qt.Horizontal)
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spaceY = self.spacing() + wid.style().layoutSpacing(QSizePolicy.PushButton, QSizePolicy.PushButton, Qt.Vertical)
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nextX = x + item.sizeHint().width() + spaceX
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if nextX - spaceX > rect.right() and lineHeight > 0:
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x = rect.x()
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y = y + lineHeight + spaceY
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nextX = x + item.sizeHint().width() + spaceX
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lineHeight = 0
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if not testOnly:
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item.setGeometry(QRect(QPoint(x, y), item.sizeHint()))
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x = nextX
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lineHeight = max(lineHeight, item.sizeHint().height())
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return y + lineHeight - rect.y()
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