使用视图委托方法(PySide / Qt / PyQt)连接QMainWindow中的操作

时间:2015-10-03 15:14:10

标签: python qt oop pyqt pyside

我有QTreeView显示来自QStandardItemModel的数据。将显示树的其中一列,其中包含一个代理,允许用户编辑和显示富文本。下面是一个SSCCE,它将编辑限制为粗体(使用键盘快捷键)。

当用户正在编辑其中一个项目时,如何设置它以便除了使用键盘快捷键(CTRL-B)切换粗体外,用户还可以使用工具栏图标切换它?

enter image description here

到目前为止,键盘快捷键效果很好(您可以双击,编辑文本,CTRL-B将切换为粗体)。但是,我还没想出如何将工具栏中的粗体按钮连接到相应的插槽:

    self.boldTextAction.triggered.connect(self.emboldenText)

我只是坐在那里什么都不做:

def emboldenText(self):
    print "Make selected text bold...How do I do this?"

如果主窗口的中央窗口小部件是文本编辑器,那么事情会很简单:我可以直接调用文本编辑器的切换粗体方法。不幸的是,当用户双击开始编辑树时,文本编辑器仅由树视图的委托临时生成。

也就是说,我们有这种复杂的关系:

  

QMainWindow - > QTreeView - > Delegate.CreateEditor - >   QTextEdit.toggleBold()

如何从主窗口中访问toggleBold()以供工具栏操作使用,特别是考虑到编辑器仅在用户打开时临时创建?

我意识到这可能不像Python / OOP问题那样是PySide / Qt问题,因此我添加了其他可能相关的标签。任何改进我的单词选择/行话的帮助也会受到赞赏。

SSCCE

#!/usr/bin/env python

import platform
import sys
from PySide import QtGui, QtCore


class MainTree(QtGui.QMainWindow):
    def __init__(self, tree, parent = None):
        QtGui.QMainWindow.__init__(self)
        self.setAttribute(QtCore.Qt.WA_DeleteOnClose) 
        self.setCentralWidget(tree)
        self.createStatusBar()
        self.createBoldAction()
        self.createToolbar()
        self.tree = tree
        #self.htmlDelegate = self.tree.itemDelegateForColumn(1)

    def createStatusBar(self):                          
        self.status = self.statusBar()
        self.status.setSizeGripEnabled(False)
        self.status.showMessage("In editor, keyboard to toggle bold")

    def createToolbar(self):
        self.textToolbar = self.addToolBar("Text actions")
        self.textToolbar.addAction(self.boldTextAction)

    def createBoldAction(self):
        self.boldTextAction = QtGui.QAction("Bold", self)
        self.boldTextAction.setIcon(QtGui.QIcon("boldText.png"))
        self.boldTextAction.triggered.connect(self.emboldenText)
        self.boldTextAction.setStatusTip("Make selected text bold")

    def emboldenText(self):
        print "Make selected text bold...How do I do this? It's stuck in RichTextLineEdit"

class HtmlTree(QtGui.QTreeView):
    def __init__(self, parent = None):    
        QtGui.QTreeView.__init__(self)
        model = QtGui.QStandardItemModel()
        model.setHorizontalHeaderLabels(['Task', 'Priority'])
        rootItem = model.invisibleRootItem()
        item0 = [QtGui.QStandardItem('Sneeze'), QtGui.QStandardItem('Low')]
        item00 = [QtGui.QStandardItem('Tickle nose'), QtGui.QStandardItem('Low')]
        item1 = [QtGui.QStandardItem('Get a job'), QtGui.QStandardItem('<b>High</b>')]
        item01 = [QtGui.QStandardItem('Call temp agency'), QtGui.QStandardItem('<b>Extremely</b> <i>high</i>')]
        rootItem.appendRow(item0)
        item0[0].appendRow(item00) 
        rootItem.appendRow(item1)
        item1[0].appendRow(item01)
        self.setModel(model)
        self.expandAll()
        self.resizeColumnToContents(0)
        self.setToolTip("Use keyboard to toggle bold")
        self.setItemDelegate(HtmlPainter(self))

class HtmlPainter(QtGui.QStyledItemDelegate):
    def __init__(self, parent=None):
        QtGui.QStyledItemDelegate.__init__(self, parent)

    def paint(self, painter, option, index):
        if index.column() == 1: 
            text = index.model().data(index) #default role is display (for edit consider fixing Valign prob)
            palette = QtGui.QApplication.palette()
            document = QtGui.QTextDocument()
            document.setDefaultFont(option.font)
            #Set text (color depends on whether selected)
            if option.state & QtGui.QStyle.State_Selected:  
                displayString = "<font color={0}>{1}</font>".format(palette.highlightedText().color().name(), text) 
                document.setHtml(displayString)
            else:
                document.setHtml(text)
            #Set background color
            bgColor = palette.highlight().color() if (option.state & QtGui.QStyle.State_Selected)\
                     else palette.base().color()
            painter.save()

            painter.fillRect(option.rect, bgColor)
            document.setTextWidth(option.rect.width())
            offset_y = (option.rect.height() - document.size().height())/2
            painter.translate(option.rect.x(), option.rect.y() + offset_y) 
            document.drawContents(painter)
            painter.restore()
        else:
            QtGui.QStyledItemDelegate.paint(self, painter, option, index)          

    def sizeHint(self, option, index):
        fm = option.fontMetrics
        if index.column() == 1:
            text = index.model().data(index)
            document = QtGui.QTextDocument()
            document.setDefaultFont(option.font)
            document.setHtml(text)
            return QtCore.QSize(document.idealWidth() + 5, fm.height())
        return QtGui.QStyledItemDelegate.sizeHint(self, option, index)


    def createEditor(self, parent, option, index):
        if index.column() == 1:
            editor = RichTextLineEdit(parent)
            editor.returnPressed.connect(self.commitAndCloseEditor)
            return editor
        else:
            return QtGui.QStyledItemDelegate.createEditor(self, parent, option,
                                                    index)

    def commitAndCloseEditor(self):
        editor = self.sender()
        if isinstance(editor, (QtGui.QTextEdit, QtGui.QLineEdit)):
            self.commitData.emit(editor)
            self.closeEditor.emit(editor, QtGui.QAbstractItemDelegate.NoHint)


class RichTextLineEdit(QtGui.QTextEdit):

    returnPressed = QtCore.Signal()

    def __init__(self, parent=None):
        QtGui.QTextEdit.__init__(self, parent)
        self.setLineWrapMode(QtGui.QTextEdit.NoWrap)
        self.setTabChangesFocus(True)
        self.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
        self.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
        fontMetrics = QtGui.QFontMetrics(self.font())
        h = int(fontMetrics.height() * (1.4 if platform.system() == "Windows"
                                   else 1.2))
        self.setMinimumHeight(h)
        self.setMaximumHeight(int(h * 1.2))
        self.setToolTip("Press <b>Ctrl+b</b> to toggle bold")

    def toggleBold(self):
        self.setFontWeight(QtGui.QFont.Normal
                if self.fontWeight() > QtGui.QFont.Normal else QtGui.QFont.Bold)

    def sizeHint(self):
        return QtCore.QSize(self.document().idealWidth() + 5,
                     self.maximumHeight())

    def minimumSizeHint(self):
        fm = QtGui.QFontMetrics(self.font())
        return QtCore.QSize(fm.width("WWWW"), self.minimumHeight())

    def keyPressEvent(self, event):
        '''This just handles all keyboard shortcuts, and stops retun from returning'''
        if event.modifiers() & QtCore.Qt.ControlModifier:
            handled = False
            if event.key() == QtCore.Qt.Key_B:
                self.toggleBold()
                handled = True
            if handled:
                event.accept()
                return
        if event.key() in (QtCore.Qt.Key_Enter, QtCore.Qt.Key_Return):
            self.returnPressed.emit()
            event.accept()
        else:
            QtGui.QTextEdit.keyPressEvent(self, event)


def main():
    app = QtGui.QApplication(sys.argv)
    myTree = HtmlTree()
    #myTree.show()
    myMainTree = MainTree(myTree)
    myMainTree.show()
    sys.exit(app.exec_())

if __name__ == "__main__":
    main()

请注意那些想要完整树体验的人,使用工具栏中的按钮,您可以将它放在与脚本相同的文件夹中(将名称更改为boldText.png

enter image description here

1 个答案:

答案 0 :(得分:1)

我认为从设计的角度来看,顶部窗口是一种全局性的。你已经描述了一种以这种方式处理它的行为(正如ekhumoro所说),它几乎要求你提供对编辑器的那个顶层窗口的访问。

一种非常简单的方法是在en_US.UTF-8方法中调用parent.window()。也许是这样的:

createEditor

这似乎对我有用。