Qt Graphics Framework中的DIV标记等价物

时间:2015-04-19 17:58:09

标签: qt pyside

我正在开发一个简单的桌面应用程序,我必须在其中显示文件夹和文件的树形结构以及其他图表。为此,我选择了Qt和python(PySide)。我需要一个像下面这样的结构(请原谅我糟糕的绘图。但是你明白了):enter image description here

可以双击文件夹以展开/缩小。当文件夹展开时,新的子元素需要占用更多空间,当前文件夹下面的文件夹必须向下移动。同样,当文件夹缩小时,必须出现当前文件夹下面的文件夹;就像标准文件夹系统一样。

因此,我在Qt中搜索<div>等效元素,我可以将每个目录及其所有子项放在该div中,div可以扩展和缩小。这样,每次打开/关闭文件夹时,我都不必为重新绘制编写代码。目前,我必须计算每个项目的位置,并将子项目分别放在该位置。这是很多计算,没有项目是&gt; 1000. With a div, I will just re-calculate positions of child items and resize the div. Other divs can then automatically re-draw themselves.

我没有使用QTreeView,因为正如我之前所说,我必须绘制其他图表并将这些文件夹与它们连接起来。 QTreeView将存在于自己的空间(带滚动条和内容),我无法绘制线条来连接QTreeView和QGraphicsScene中的项目。

您可以在github中查看我当前的作品hereHere is the file that has my work.

1 个答案:

答案 0 :(得分:1)

我不确定你在想什么&#34; <div>&#34;。它只是最简单的HTML容器,它似乎与您的目标无关。

您可以使用图形布局自动对齐场景中的项目。以下是如何实施的:

from PySide import QtGui, QtCore

class Leaf(QtGui.QGraphicsProxyWidget):
  def __init__(self, path, folder = None):
    QtGui.QGraphicsProxyWidget.__init__(self)
    self.folder = folder
    label = QtGui.QLabel()
    label.setText(QtCore.QFileInfo(path).fileName())
    self.setWidget(label)
    self.setToolTip(path)
    self.setAcceptedMouseButtons(QtCore.Qt.LeftButton)

  def mousePressEvent(self, event):
    if self.folder:
      self.folder.toggleChildren()

class Folder(QtGui.QGraphicsWidget):
  def __init__(self, path, isTopLevel = False):
    QtGui.QGraphicsWidget.__init__(self)
    self.offset = 32
    childrenLayout = QtGui.QGraphicsLinearLayout(QtCore.Qt.Vertical)
    childrenLayout.setContentsMargins(self.offset, 0, 0, 0)

    flags = QtCore.QDir.AllEntries | QtCore.QDir.NoDotAndDotDot
    for info in QtCore.QDir(path).entryInfoList(flags):
      if info.isDir():
        childrenLayout.addItem(Folder(info.filePath()))
      else:
        childrenLayout.addItem(Leaf(info.filePath()))

    self.childrenWidget = QtGui.QGraphicsWidget()
    self.childrenWidget.setLayout(childrenLayout)

    mainLayout = QtGui.QGraphicsLinearLayout(QtCore.Qt.Vertical)
    mainLayout.setContentsMargins(0, 0, 0, 0)
    self.leaf = Leaf(path, self)
    mainLayout.addItem(self.leaf)
    mainLayout.addItem(self.childrenWidget)
    if isTopLevel:
      mainLayout.addStretch()
    self.setLayout(mainLayout)

  def paint(self, painter, option, widget):
    QtGui.QGraphicsWidget.paint(self, painter, option, widget)
    if self.childrenWidget.isVisible() and self.childrenWidget.layout().count() > 0:
      lastChild = self.childrenWidget.layout().itemAt(self.childrenWidget.layout().count() - 1)
      lastChildY = self.childrenWidget.geometry().top() + \
          lastChild.geometry().top() + self.leaf.geometry().height() / 2;
      painter.drawLine(self.offset / 2, self.leaf.geometry().bottom(), self.offset / 2, lastChildY)
      for i in range(0, self.childrenWidget.layout().count()):
        child = self.childrenWidget.layout().itemAt(i)
        childY = self.childrenWidget.geometry().top() + \
            child.geometry().top() + self.leaf.geometry().height() / 2
        painter.drawLine(self.offset / 2, childY, self.offset, childY)

  def toggleChildren(self):
    if self.childrenWidget.isVisible():
      self.layout().removeItem(self.childrenWidget)
      self.childrenWidget.hide()
      self.leaf.widget().setStyleSheet("QLabel { color : blue; }")
      print "hide"
    else:
      self.childrenWidget.show()
      self.layout().insertItem(1, self.childrenWidget)
      self.leaf.widget().setStyleSheet("")
    self.update()

if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    scene = QtGui.QGraphicsScene()
    view = QtGui.QGraphicsView(scene)
    # put your root path here
    scene.addItem(Folder("/usr/share/alsa", True))
    view.show()
    view.resize(400, 400)
    sys.exit(app.exec_())

demo