/usr/lib/python2.7/dist-packages/pyqtgraph/graphicsItems/GraphicsWidgetAnchor.py is in python-pyqtgraph 0.9.10-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 | from ..Qt import QtGui, QtCore
from ..Point import Point
class GraphicsWidgetAnchor(object):
"""
Class used to allow GraphicsWidgets to anchor to a specific position on their
parent. The item will be automatically repositioned if the parent is resized.
This is used, for example, to anchor a LegendItem to a corner of its parent
PlotItem.
"""
def __init__(self):
self.__parent = None
self.__parentAnchor = None
self.__itemAnchor = None
self.__offset = (0,0)
if hasattr(self, 'geometryChanged'):
self.geometryChanged.connect(self.__geometryChanged)
def anchor(self, itemPos, parentPos, offset=(0,0)):
"""
Anchors the item at its local itemPos to the item's parent at parentPos.
Both positions are expressed in values relative to the size of the item or parent;
a value of 0 indicates left or top edge, while 1 indicates right or bottom edge.
Optionally, offset may be specified to introduce an absolute offset.
Example: anchor a box such that its upper-right corner is fixed 10px left
and 10px down from its parent's upper-right corner::
box.anchor(itemPos=(1,0), parentPos=(1,0), offset=(-10,10))
"""
parent = self.parentItem()
if parent is None:
raise Exception("Cannot anchor; parent is not set.")
if self.__parent is not parent:
if self.__parent is not None:
self.__parent.geometryChanged.disconnect(self.__geometryChanged)
self.__parent = parent
parent.geometryChanged.connect(self.__geometryChanged)
self.__itemAnchor = itemPos
self.__parentAnchor = parentPos
self.__offset = offset
self.__geometryChanged()
def autoAnchor(self, pos, relative=True):
"""
Set the position of this item relative to its parent by automatically
choosing appropriate anchor settings.
If relative is True, one corner of the item will be anchored to
the appropriate location on the parent with no offset. The anchored
corner will be whichever is closest to the parent's boundary.
If relative is False, one corner of the item will be anchored to the same
corner of the parent, with an absolute offset to achieve the correct
position.
"""
pos = Point(pos)
br = self.mapRectToParent(self.boundingRect()).translated(pos - self.pos())
pbr = self.parentItem().boundingRect()
anchorPos = [0,0]
parentPos = Point()
itemPos = Point()
if abs(br.left() - pbr.left()) < abs(br.right() - pbr.right()):
anchorPos[0] = 0
parentPos[0] = pbr.left()
itemPos[0] = br.left()
else:
anchorPos[0] = 1
parentPos[0] = pbr.right()
itemPos[0] = br.right()
if abs(br.top() - pbr.top()) < abs(br.bottom() - pbr.bottom()):
anchorPos[1] = 0
parentPos[1] = pbr.top()
itemPos[1] = br.top()
else:
anchorPos[1] = 1
parentPos[1] = pbr.bottom()
itemPos[1] = br.bottom()
if relative:
relPos = [(itemPos[0]-pbr.left()) / pbr.width(), (itemPos[1]-pbr.top()) / pbr.height()]
self.anchor(anchorPos, relPos)
else:
offset = itemPos - parentPos
self.anchor(anchorPos, anchorPos, offset)
def __geometryChanged(self):
if self.__parent is None:
return
if self.__itemAnchor is None:
return
o = self.mapToParent(Point(0,0))
a = self.boundingRect().bottomRight() * Point(self.__itemAnchor)
a = self.mapToParent(a)
p = self.__parent.boundingRect().bottomRight() * Point(self.__parentAnchor)
off = Point(self.__offset)
pos = p + (o-a) + off
self.setPos(pos)
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