我正在为我的问题寻找解决方案。我做了什么？我写了一个名为 ExtendedTruncateTextLineEdit 的子类，它继承自QLineEdit。我想要的是？好吧，当你调整窗口大小并且QLineEdit变得比内容小时，我想在名为 QLineEdit 的Qwidget中截断文本。以下代码确实有效，但QLineEdit-widget看起来像QLabel。我需要做的是，以下代码还绘制了我的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()
答案 0 :(得分：3)
这是您可能想要的粗略版本。我在大约10分钟内煮熟了，所以非常粗糙。请注意，这在没有任何地方接近完成。它还有几件事要做。在这种情况下，当 Toolbar toolbar = (Toolbar) findViewById(R.id.editProfileToolbar);
this.setSupportActionBar(toolbar);
失去焦点时，文本将被省略。当文本获得焦点时，必须恢复该文本。该部分尚未实施。或更改字体将导致错误的删除，因为QLineEdit对象不会被更改，等等...
QFontMentrics答案 1 :(得分：0)
我也需要这个项目，所以我进一步考虑了Marcus的答案，并进行了focusIn和focusOut处理。
由于某种原因，当我致电self.end()或self.setCursorPosition(len(self.text())似乎没有做太多事情......如果有人可以改进，那就让我知道了。
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()))
答案 2 :(得分：0)
对于Spencer和其他用户，我认为我有一个解决方案。以下方案适用于以下可执行程序。当用户运行该程序并且他正在键入loooong文本时，程序不会缩短文本。如果该窗口小部件保留焦点（QLineEdit()），则FocusIn中的长文本也不会被截断，但用户会调整窗口大小。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。之后，当用户决定编辑非常低调的文本并点击QLineEdit()时，文本会显示而不会出现任何短路。
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_())