QGraphicsLayout - Unexpected Extra Spacing Between Items

biergaizi

I am using QGraphics Framework to write some prototypes. I got in trouble on simulating regular layouting. There is a large spacing between these two widgets, but I set all the possible spacing to 0 already.

!http://blog001.oss.aliyuncs.com/white_space.png(White Space Betweet the Image and the Text)!

Here is my code (Sorry, it should be shorter):

@
import sys
from PyQt4 import QtCore, QtGui
from PyQt4.QtCore import Qt

class PixmapLayoutItem(QtGui.QGraphicsLayoutItem):

def __init__(self, image, parent=None):
    super(PixmapLayoutItem, self).__init__(parent)
    self.pixmapItem = QtGui.QGraphicsPixmapItem()
    self.pixmapItem.setPixmap(QtGui.QPixmap(image))
    self.setGraphicsItem(self.pixmapItem)
    print(self.pixmapItem.boundingRect().size(),
          self.pixmapItem.pixmap().size())

def sizeHint(self, which, constraint=QtCore.QSizeF()):
    return self.pixmapItem.boundingRect().size()

def setGeometry(self, rect):
    self.pixmapItem.setPos(rect.topLeft())

class TextLayoutItem(QtGui.QGraphicsLayoutItem):

def __init__(self, text, parent=None):
    super(TextLayoutItem, self).__init__(parent)
    self.textItem = QtGui.QGraphicsTextItem()
    self.textItem.setHtml(text)
    self.setGraphicsItem(self.textItem)
    print(self.textItem.boundingRect().size())

def sizeHint(self, which, constraint=QtCore.QSizeF()):
    return self.textItem.boundingRect().size()

def setGeometry(self, rect):
    self.textItem.setPos(rect.topLeft())

class MainWindow(QtGui.QGraphicsView):

def __init__(self, parent=None):
    super(MainWindow, self).__init__(parent)

    mainLayout = QtGui.QGraphicsLinearLayout()
    mainLayout.setSpacing(0)

    avatar = self._avatar()
    mainLayout.addItem(avatar)
    mainLayout.setAlignment(avatar, Qt.AlignCenter)

    text = self._text()
    mainLayout.addItem(text)
    mainLayout.setAlignment(text, Qt.AlignCenter)

    mainWidget = QtGui.QGraphicsWidget()
    mainWidget.setLayout(mainLayout)

    scene = QtGui.QGraphicsScene()
    scene.addItem(mainWidget)
    self.setScene(scene)

@staticmethod
def _avatar():
    pixmap = PixmapLayoutItem("./avatar.jpg")
    text = TextLayoutItem("Hello, world!")

    avatarLayout = QtGui.QGraphicsLinearLayout()
    avatarLayout.setOrientation(Qt.Vertical)
    avatarLayout.setSpacing(0)

    avatarLayout.addItem(pixmap)
    avatarLayout.setAlignment(pixmap, Qt.AlignCenter)

    avatarLayout.addItem(text)
    avatarLayout.setAlignment(text, Qt.AlignCenter)

    avatarWidget = QtGui.QGraphicsWidget()
    avatarWidget.setWindowFrameMargins(0, 0, 0, 0)
    avatarWidget.setContentsMargins(0, 0, 0, 0)
    avatarWidget.setLayout(avatarLayout)

    return avatarWidget

@staticmethod
def _text():
    text = TextLayoutItem("UNIX - Where is a shell, where is a way.")
    return text

if name == "main":
App = QtGui.QApplication(sys.argv)
main = MainWindow()
main.show()
App.exec()
@

I don't know what is the root of the issue.

Thanks.