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# SizeGripItem - A size grip QGraphicsItem for interactive resizing.
#
# Python port by Felipe Correa da Silva Sanches
# based on the original C++ code by Cesar L. B. Silveira
#
# Copyright (c) 2015 Felipe Correa da Silva Sanches <juca@members.fsf.org>
# Copyright (c) 2011 Cesar L. B. Silveira
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QBrush
from PyQt5.QtWidgets import QGraphicsItem, QGraphicsRectItem
Top = 1 << 0
Bottom = 1 << 1
Left = 1 << 2
Right = 1 << 3
TopLeft = Top | Left
BottomLeft = Bottom | Left
TopRight = Top | Right
BottomRight = Bottom | Right
class HandleItem(QGraphicsRectItem):
def __init__(self, positionFlags, parent):
super(HandleItem, self).__init__(-4, -4, 8, 8, parent)
self.positionFlags = positionFlags
self.parent = parent
self.setBrush(QBrush(Qt.lightGray))
self.setFlag(QGraphicsItem.ItemIsMovable)
self.setFlag(QGraphicsItem.ItemSendsGeometryChanges)
def itemChange(self, change, value):
if change == QGraphicsItem.ItemPositionChange:
return self.restrictPosition(value)
elif change == QGraphicsItem.ItemPositionHasChanged:
if self.positionFlags == TopLeft:
self.parent.setTopLeft(value)
elif self.positionFlags == Top:
self.parent.setTop(value.y())
elif self.positionFlags == TopRight:
self.parent.setTopRight(value)
elif self.positionFlags == Right:
self.parent.setRight(value.x())
elif self.positionFlags == BottomRight:
self.parent.setBottomRight(value)
elif self.positionFlags == Bottom:
self.parent.setBottom(value.y())
elif self.positionFlags == BottomLeft:
self.parent.setBottomLeft(value)
elif self.positionFlags == Left:
self.parent.setLeft(value.x())
return value
def restrictPosition(self, newPos):
retVal = newPos
if self.positionFlags & Top or self.positionFlags & Bottom:
retVal.setY(newPos.y())
if self.positionFlags & Left or self.positionFlags & Right:
retVal.setX(newPos.x())
if self.positionFlags & Top and retVal.y() > self.parent.rect.bottom():
retVal.setY(self.parent.rect.bottom())
elif self.positionFlags & Bottom and retVal.y() < self.parent.rect.top():
retVal.setY(self.parent.rect.top())
if self.positionFlags & Left and retVal.x() > self.parent.rect.right():
retVal.setX(self.parent.rect.right())
elif self.positionFlags & Right and retVal.x() < self.parent.rect.left():
retVal.setX(self.parent.rect.left())
return retVal
class SizeGripItem(QGraphicsItem):
def __init__(self, resizer, parent):
super(SizeGripItem, self).__init__(parent)
self.resizer = resizer
self.parent = parent
self.rect = self.parent.boundingRect()
self.handleItems = [HandleItem(d, self) for d in [Top, Bottom, Left, TopLeft, BottomLeft, Right, TopRight, BottomRight]]
self.updateHandleItemPositions()
def boundingRect(self):
return self.rect
def paint(self, painter, option, widget):
pass
def setTopLeft(self, pos):
self.rect.setTopLeft(pos)
self.doResize()
def setTop(self, y):
self.rect.setTop(y)
self.doResize()
def setTopRight(self, pos):
self.rect.setTopRight(pos)
self.doResize()
def setRight(self, x):
self.rect.setRight(x)
self.doResize()
def setBottomRight(self, pos):
self.rect.setBottomRight(pos)
self.doResize()
def setBottom(self, y):
self.rect.setBottom(y)
self.doResize()
def setBottomLeft(self, pos):
self.rect.setBottomLeft(pos)
self.doResize()
def setLeft(self, x):
self.rect.setLeft(x)
self.doResize()
def doResize(self):
if self.resizer:
self.resizer.resize(self.rect)
self.updateHandleItemPositions()
def updateHandleItemPositions(self):
for item in self.handleItems:
item.setFlag(QGraphicsItem.ItemSendsGeometryChanges, False)
flags = item.positionFlags
if flags == TopLeft:
item.setPos(self.rect.topLeft())
elif flags == Top:
item.setPos(self.rect.left() + self.rect.width() / 2 - 1,
self.rect.top())
elif flags == TopRight:
item.setPos(self.rect.topRight())
elif flags == Right:
item.setPos(self.rect.right(),
self.rect.top() + self.rect.height() / 2 - 1)
elif flags == BottomRight:
item.setPos(self.rect.bottomRight())
elif flags == Bottom:
item.setPos(self.rect.left() + self.rect.width() / 2 - 1,
self.rect.bottom())
elif flags == BottomLeft:
item.setPos(self.rect.bottomLeft())
elif flags == Left:
item.setPos(self.rect.left(),
self.rect.top() + self.rect.height() / 2 - 1)
item.setFlag(QGraphicsItem.ItemSendsGeometryChanges, True)
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