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Python: PyQt- FlowLayout
#! /usr/bin/python2
# -*- coding: utf-8 -*-
from PyQt4 import QtCore, QtGui
class FlowLayout(QtGui.QLayout):
def __init__(self, parent=None, margin=0, spacing=-1):
super(FlowLayout, self).__init__(parent)
if parent is not None:
self.setMargin(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 count(self):
return len(self.itemList)
def itemAt(self, index):
if index >= 0 and index < len(self.itemList):
return self.itemList[index]
return None
def takeAt(self, index):
if index >= 0 and index < len(self.itemList):
return self.itemList.pop(index)
return None
def expandingDirections(self):
return QtCore.Qt.Orientations(QtCore.Qt.Orientation(0))
def hasHeightForWidth(self):
return True
def heightForWidth(self, width):
height = self._doLayout(QtCore.QRect(0, 0, width, 0), True)
return height
def setGeometry(self, rect):
super(FlowLayout, self).setGeometry(rect)
self._doLayout(rect, False)
def sizeHint(self):
return self.minimumSize()
def minimumSize(self):
size = QtCore.QSize()
for item in self.itemList:
size = size.expandedTo(item.minimumSize())
size += QtCore.QSize(2 * self.margin(), 2 * self.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(
QtGui.QSizePolicy.PushButton,
QtGui.QSizePolicy.PushButton,
QtCore.Qt.Horizontal)
spaceY = self.spacing() + wid.style().layoutSpacing(
QtGui.QSizePolicy.PushButton,
QtGui.QSizePolicy.PushButton,
QtCore.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(
QtCore.QRect(QtCore.QPoint(x, y), item.sizeHint()))
x = nextX
lineHeight = max(lineHeight, item.sizeHint().height())
return y + lineHeight - rect.y()
if __name__ == '__main__':
import sys
class Window(QtGui.QWidget):
def __init__(self):
super(Window, self).__init__()
flowLayout = FlowLayout()
flowLayout.addWidget(QtGui.QPushButton("Short"))
flowLayout.addWidget(QtGui.QPushButton("Longer"))
flowLayout.addWidget(QtGui.QPushButton("Different text"))
flowLayout.addWidget(QtGui.QPushButton("More text"))
flowLayout.addWidget(QtGui.QPushButton("Even longer button text"))
self.setLayout(flowLayout)
self.setWindowTitle("Flow Layout")
app = QtGui.QApplication(sys.argv)
mainWin = Window()
mainWin.show()
sys.exit(app.exec_())
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