Python/PyQT:如何截断QLineEdit中的文本
Python/PyQT:如何截断QLineEdit中的文本
提问于 2016-03-30 05:02:10
我正在为我的问题寻找解决方案。我做错什么了？我从QLineEdit继承了一个名为ExtendedTruncateTextLineEdit的子类。我想要什么？嗯，当你调整窗口大小时，当变得比内容小的时候，我想在一个名为 QLineEdit 的Qwidget中截断一个文本QLineEdit。下面的代码可以工作，但是QLineEdit-widget看起来像一个QLabel。我必须做什么，让下面的代码也绘制我的QLineEdit？
import sys
from PyQt4.QtCore import Qt
from PyQt4.QtGui import QApplication,\
QLineEdit,\
QLabel,\
QFontMetrics,\
QHBoxLayout,\
QVBoxLayout,\
QWidget,\
QIcon,\
QPushButton,\
QToolTip,\
QBrush,\
QColor,\
QFont,\
QPalette,\
QPainter
qt_app = QApplication(sys.argv)
class Example(QWidget):
def __init__(self):
QWidget.__init__(self)
self.setMinimumWidth(100)
self.init_ui()
def init_ui(self):
v_layout = QVBoxLayout()
v_layout.addStretch(1)
lbl = ExtendedTruncateTextLabel("This is a really, long and poorly formatted runon sentence used to illustrate a point", self)
#lbl.setText("This is a really, long and poorly formatted runon sentence used to illustrate a point")
lbl_1 = ExtendedTruncateTextLabel(self)
lbl_1.setText("Dies ist ein normaler Text")
l_text = ExtendedTruncateTextLineEdit()
l_text.setText("In the widget namend QLineEdit is also a very long text")
v_layout.addWidget(lbl)
v_layout.addWidget(lbl_1)
v_layout.addWidget(l_text)
self.setLayout(v_layout)
def run(self):
self.show()
qt_app.exec_()
class ExtendedTruncateTextLineEdit(QLineEdit):
def __init(self, parent):
QLineEdit.__init__(self, parent)
def paintEvent(self, event):
""" Handle the paint event for the title bar.
This paint handler draws the title bar text and title buttons.
"""
super(ExtendedTruncateTextLineEdit, self).paintEvent(event)
painter = QPainter(self)
metrics = QFontMetrics(self.font())
elided = metrics.elidedText(self.text(), Qt.ElideMiddle, self.width())
painter.drawText(self.rect(), self.alignment(), elided)
if __name__ == '__main__':
app = Example()
app.run()回答 3
Stack Overflow用户
回答已采纳
发布于 2016-03-30 19:47:07
这是你可能想要的一个粗略的版本。我在大约10分钟的时间里做好了这个，所以非常粗糙。请注意，在中，这几乎不是一个完整的。它还有几件事要做。在这种情况下，当QLineEdit失去焦点时，文本将被省略。当文本获得焦点时，必须恢复文本。这部分还没有实现。或者更改字体将导致错误的省略，因为QFontMentrics对象将不会被更改，等等。
class ElidingLineEdit( QLineEdit ) :
"""Eliding text lineedit
"""
def __init__( self, text = QString(), parent = None ) :
"""Class initialiser
"""
QLineEdit.__init__( self, parent )
self.mText = text;
self.fm = QFontMetrics( self.font() )
self.textEdited[ QString ].connect( self.saveText )
self.editingFinished.connect( self.shortenText )
def setText( self, txt ) :
"""setText( QString ) -> None
Override the QLineEdit::setText to display the shortened text
@return None
"""
QLineEdit.setText( self, self.fm.elidedText( self.mText, Qt.ElideRight, self.width() ) )
def resizeEvent( self, rEvent ) :
"""resizeEvent( QResizeEvent ) -> None
Override the resizeevent to shorten the text
@return None
"""
QLineEdit.setText( self, self.fm.elidedText( self.mText, Qt.ElideRight, rEvent.size().width() ) )
rEvent.accept()
def saveText( self, newText ) :
"""saveText() -> None
Save the text as it is changing
@return None
"""
self.mText = newText
def shortenText( self ) :
"""saveText() -> None
Save the text as it is changing
@return None
"""
QLineEdit.setText( self, self.fm.elidedText( self.mText, Qt.ElideRight, self.width() ) )Stack Overflow用户
发布于 2018-03-18 03:32:13
我还需要在一个项目中使用它，所以我将马库斯的回答做得更深入一些，并进行了focusIn和focusOut处理。
由于某些原因，当我调用self.end()或self.setCursorPosition(len(self.text())时，两者似乎都没有做太多事情……如果有人能改进这一点，我就知道了。
class ElidingQLineEdit(QtGui.QLineEdit):
def __init__(self, text= ""):
super(ElidingQLineEdit, self).__init__()
self.mText = text
self.fm = QtGui.QFontMetrics(self.font())
self.textEdited.connect(self.saveText)
self.editingFinished.connect(self.elideText)
def setText(self, text, elide=True):
self.mText = text
if elide:
QtGui.QLineEdit.setText(self, self.fm.elidedText(text, QtCore.Qt.ElideMiddle, self.width()))
else:
QtGui.QLineEdit.setText(self, text)
def resizeEvent(self, rEvent):
QtGui.QLineEdit.setText(self, self.fm.elidedText(self.mText, QtCore.Qt.ElideMiddle, rEvent.size().width()))
rEvent.accept()
def saveText(self, newText):
self.mText = newText
def focusInEvent(self, QFocusEvent):
super(ElidingQLineEdit, self).focusInEvent(QFocusEvent)
self.setText(self.mText, False)
self.setCursorPosition(len(self.text()))
def focusOutEvent(self, QFocusEvent):
super(ElidingQLineEdit, self).focusOutEvent(QFocusEvent)
self.setText(self.mText, True)
def elideText(self):
QtGui.QLineEdit.setText(self, self.fm.elidedText(self.mText, QtCore.Qt.ElideMiddle, self.width()))Stack Overflow用户
发布于 2018-06-11 04:43:07
对于Spencer和其他用户，我想我有一个解决方案。以下方案适用于以下可执行程序。当用户运行这个程序时，当他输入一个很长的文本时，程序不会缩短文本。此外，如果小部件保持焦点(FocusIn)，则QLineEdit()中的长文本不会被截断，但用户可以调整窗口大小。这意味着，只要QLineEdit()保持焦点(FocusIn)，文本就不会缩短。只有当QLineEdit()失去焦点(FocusOut)时，文本才会缩短。稍后，当用户决定编辑非常长的文本并在QLineEdit()中单击时，该文本将不带任何缩写显示。
class Example(QWidget):
def __init__(self, elide = Qt.ElideMiddle, parent = None):
QWidget.__init__(self, parent)
self.setMinimumWidth(80)
self.font_metrics = QFontMetrics(self.font())
self.saved_text = ""
self._elide = elide
self._show_original_text = False
self.init_ui()
def init_ui(self):
# Create an instance of QLineEdit()
self.line_edit_text = QLineEdit()
self.line_edit_text.setPlaceholderText("Hell world I am here where you are")
# We must implement the eventFilter method
# and enable this property to the widgets that are needed with
self.line_edit_text.installEventFilter(self)
# Create an instance of QPushButton()
self.push_button = QPushButton("Just click me, nothing will happen.")
self.push_button.installEventFilter(self)
# Add the both widgets to the layout, that is created.
v_layout = QVBoxLayout()
v_layout.addStretch(1)
v_layout.addWidget(self.line_edit_text)
v_layout.addWidget(self.push_button)
self.setLayout(v_layout)
# Set a slot, connect() the textChanged-slot to the handle_text_change()-method.
self.line_edit_text.textEdited[QString].connect(self.save_text)
def eventFilter(self, obj, event):
# The eventFilter method has as information
# the object and type of event. So we have to
# listen to the focus events.
if event.type() == QEvent.FocusIn:
if obj == self.line_edit_text:
self.line_edit_text.setText(self.saved_text)
print "You clicked in the LineEdit"
self._show_original_text = True
if event.type() == QEvent.FocusOut:
if obj == self.line_edit_text:
print "You lost focus"
self._show_original_text = False
self.line_edit_text.setText(self.font_metrics.elidedText(self.saved_text, self._elide, self.width() -35))
return super(QWidget, self).eventFilter(obj, event)
def save_text(self, new_text):
'''
NOTICE:
=======
Implement the saveText()-method to save the text as it is changing.
PARAMETERS:
===========
:new_text - The given text have to save.
:return - Nothing is returned. The statement 'return'
terminates a function. That makes sure that the
function is definitely finished.
'''
self.saved_text = new_text
return
def resizeEvent(self, rEvent):
'''
NOTICE:
=======
Override the resizeevent()-method of QLineEdit()-class to shorten the text.
PARAMETERS:
===========
:rEvent - The given QResizeEvent class contains event
parameters for resize events - for example accept()-method.
:return - Nothing is returned. The statement 'return'
terminates a function. That makes sure that the
function is definitely finished.
'''
if not self._show_original_text:
self.line_edit_text.setText(self.font_metrics.elidedText(self.saved_text, self._elide, rEvent.size().width() -35))
rEvent.accept()
return
if __name__ == '__main__':
app = QApplication(sys.argv)
window = Example()
window.show()
sys.exit(app.exec_())页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/36295020
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