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from PyQt5.QtCore import Qt, QRect, QPoint, QSize
from PyQt5.QtWidgets import QLayout, QSizePolicy
class flowLayout(QLayout):
"""
Custom layout that flows horizontally first, then vertically.
From Qt examples.
"""
def __init__(self, parent=None, margin=0, spacing=12):
super(flowLayout, self).__init__(parent)
if parent is not None:
self.setContentsMargins(margin, margin, margin, margin)
self.setSpacing(spacing)
self.itemList = []
def __del__(self):
# Delete layout call
item = self.takeAt(0)
while item:
item = self.takeAt(0)
def addItem(self, item):
# add item to layout
self.itemList.append(item)
def count(self):
# return a list of items
return len(self.itemList)
def itemAt(self, index):
# return item at index
if index >= 0 and index < len(self.itemList):
return self.itemList[index]
return None
def takeAt(self, index):
# pop item at index
if index >= 0 and index < len(self.itemList):
return self.itemList.pop(index)
return None
def expandingDirections(self):
# define orientation
return Qt.Orientations(Qt.Orientation(0))
def hasHeightForWidth(self):
# height for width flag, height value for a particular width
return True
def heightForWidth(self, width):
# returns the height for a given width
height = self.doLayout(QRect(0, 0, width, 0), True)
return height
def setGeometry(self, rect):
# change layout geometry
super(flowLayout, self).setGeometry(rect)
self.doLayout(rect, False)
def sizeHint(self):
# returns the expected size
return self.minimumSize()
def minimumSize(self):
# calucalate minimum possible size below which, resize is impossible
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):
# build layout, testOnly defines if the geometry needs to be changed or not
x = rect.x()
y = rect.y()
lineHeight = 0
for item in self.itemList:
wid = item.widget()
spaceX = self.spacing() + wid.style().layoutSpacing(QSizePolicy.ToolButton, QSizePolicy.ToolButton, Qt.Horizontal)
spaceY = self.spacing() + wid.style().layoutSpacing(QSizePolicy.ToolButton, QSizePolicy.ToolButton, 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()
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