148 lines
5.4 KiB
Python
148 lines
5.4 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 import QtCore, QtWidgets
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class FlowLayout(QtWidgets.QLayout):
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def __init__(self, parent=None, margin=-1, hspacing=-1, vspacing=-1):
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super(FlowLayout, self).__init__(parent)
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self._hspacing = hspacing
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self._vspacing = vspacing
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self._items = []
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self.setContentsMargins(margin, margin, margin, margin)
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def __del__(self):
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del self._items[:]
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def addItem(self, item):
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self._items.append(item)
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def horizontalSpacing(self):
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if self._hspacing >= 0:
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return self._hspacing
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else:
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return self.smartSpacing(QtWidgets.QStyle.PM_LayoutHorizontalSpacing)
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def verticalSpacing(self):
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if self._vspacing >= 0:
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return self._vspacing
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else:
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return self.smartSpacing(QtWidgets.QStyle.PM_LayoutVerticalSpacing)
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def count(self):
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return len(self._items)
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def itemAt(self, index):
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if 0 <= index < len(self._items):
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return self._items[index]
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def takeAt(self, index):
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if 0 <= index < len(self._items):
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return self._items.pop(index)
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def expandingDirections(self):
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return QtCore.Qt.Orientations(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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return self.doLayout(QtCore.QRect(0, 0, width, 0), True)
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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 = QtCore.QSize()
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for item in self._items:
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size = size.expandedTo(item.minimumSize())
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left, top, right, bottom = self.getContentsMargins()
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size += QtCore.QSize(left + right, top + bottom)
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return size
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def doLayout(self, rect, testonly):
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left, top, right, bottom = self.getContentsMargins()
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effective = rect.adjusted(+left, +top, -right, -bottom)
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x = effective.x()
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y = effective.y()
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lineheight = 0
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for item in self._items:
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widget = item.widget()
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hspace = self.horizontalSpacing()
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if hspace == -1:
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hspace = widget.style().layoutSpacing(
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QtWidgets.QSizePolicy.PushButton,
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QtWidgets.QSizePolicy.PushButton,
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QtCore.Qt.Horizontal,
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)
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vspace = self.verticalSpacing()
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if vspace == -1:
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vspace = widget.style().layoutSpacing(
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QtWidgets.QSizePolicy.PushButton,
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QtWidgets.QSizePolicy.PushButton,
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QtCore.Qt.Vertical,
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)
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nextX = x + item.sizeHint().width() + hspace
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if nextX - hspace > effective.right() and lineheight > 0:
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x = effective.x()
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y = y + lineheight + vspace
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nextX = x + item.sizeHint().width() + hspace
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lineheight = 0
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if not testonly:
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item.setGeometry(QtCore.QRect(QtCore.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() + bottom
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def smartSpacing(self, pm):
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parent = self.parent()
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if parent is None:
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return -1
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elif parent.isWidgetType():
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return parent.style().pixelMetric(pm, None, parent)
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else:
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return parent.spacing()
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