在我的应用程序中，我必须用自定义的 QLineEdit 替换所有 QLineEdit 元素。为此，有不同的解决方案：
到目前为止，我可以编写一个模块（WidgetReplacer），它递归地搜索 QGridLayout 项目并搜索是否有 QLineEdit 子项。如果是的话，那就换成我的吧。
问题是，当我尝试访问我的 LineEdit 对象之一时，出现以下错误：
RuntimeError: wrapped C/C++ object of type QLineEdit has been deleted
如果我查看输出，我会注意到修改后的 QLineEdit 对象仍然保留旧的 id：
old qt_obj <PyQt4.QtGui.QLineEdit object at 0x0543C930>
Replaced txt_line_1 with LineEdit
new qt_obj <LineEdit.LineEdit object at 0x0545B4B0>
----------------------------------
...
----------------------------------
<PyQt4.QtGui.QLineEdit object at 0x0543C930>
为什么会出现这种情况？如何在运行时替换 QWidgets？
这里有一些关于对象包装的附加细节： 在模块 WidgetReplace 中，如果我转储 QEditLine 和 LineEdit 对象，我会得到：
<PyQt4.QtGui.QLineEdit object at 0x05378618>
Reference count: 7
Address of wrapped object: 051FAC40
Created by: Python
To be destroyed by: C/C++
Parent wrapper: <PyQt4.QtGui.QGridLayout object at 0x05378588>
Next sibling wrapper: NULL
Previous sibling wrapper: <PyQt4.QtGui.QLabel object at 0x05378930>
First child wrapper: NULL
和
<LineEdit.LineEdit object at 0x05378978>
Reference count: 3
Address of wrapped object: 051FAC40
Created by: Python
To be destroyed by: C/C++
Parent wrapper: <__main__.Dialog object at 0x0535FBB8>
Next sibling wrapper: <PyQt4.QtGui.QGridLayout object at 0x05378780>
Previous sibling wrapper: NULL
First child wrapper: NULL
相反，如果我从主窗口转储行编辑，我会得到关注，它代表已删除的 QLineEdit 对象：
<PyQt4.QtGui.QLineEdit object at 0x05378618>
Reference count: 2
Address of wrapped object: 00000000
Created by: Python
To be destroyed by: C/C++
Parent wrapper: NULL
Next sibling wrapper: NULL
Previous sibling wrapper: NULL
First child wrapper: NULL
对话框 ui 和生成文件可以从 DropBox dialog.ui 和dialog.py
下载主要
import sys
from PyQt4.QtGui import QDialog, QApplication
from dialog import Ui_Form
from WidgetReplacer import WidgetReplacer
class Dialog(QDialog, Ui_Form):
def __init__(self, parent = None):
super(Dialog, self).__init__(parent)
# Set up the user interface from Designer.
self.setupUi(self)
WidgetReplacer().replace_all_qlineedit(self)
if __name__ == "__main__":
app = QApplication(sys.argv)
window = Dialog()
window.show()
print window.txt_line_1
window.txt_line_1.setText("Hello Text 1")
sys.exit(app.exec_())
行编辑
from PyQt4.QtGui import QLineEdit, QValidator, QPalette
from PyQt4 import QtCore
class LineEdit(QLineEdit):
def __init__(self, parent=None):
super(LineEdit, self).__init__(parent)
self.color_red = QPalette()
self.color_red.setColor(QPalette.Text, QtCore.Qt.red)
self.color_black = QPalette()
self.color_black.setColor(QPalette.Text, QtCore.Qt.red)
# Make connections
self.textChanged.connect(self.verify_text)
def verify_text(self, text):
validator = self.validator()
is_valid = QValidator.Acceptable
if validator is not None:
is_valid = validator.validate(text, 0)
if is_valid == QValidator.Acceptable:
self.setPalette(self.color_black)
elif is_valid in [QValidator.Invalid, QValidator.Intermediate]:
self.setPalette(self.color_red)
小部件替换器
import sip
from LineEdit import LineEdit
from PyQt4.QtCore import QRegExp
from PyQt4 import QtGui
class WidgetReplacer():
def __init__(self):
pass
def replace_all_qlineedit(self, qt_dlg):
children = self._get_all_gridlayout(qt_dlg)
items = []
for child in children:
new_items = self._find_all_obj_in_layout(child, QtGui.QLineEdit)
items.extend(new_items)
for item in items:
layout = item[0]
row = item[1]
column = item[2]
qt_obj = item[3]
self._replace_qlineedit_from_gridlayout(qt_dlg, qt_obj,
layout, row, column)
def _get_all_gridlayout(self, qt_dlg):
return qt_dlg.findChildren(QtGui.QGridLayout, QRegExp("gridLayout_[0-9]"))
def _find_all_obj_in_layout(self, layout, qt_type):
# Output list format:
# layout, row, col, qt_obj,
objects = []
if type(layout) == QtGui.QGridLayout:
layout_cols = layout.columnCount()
layout_rows = layout.rowCount()
for i in range(layout_rows):
for j in range(layout_cols):
item = layout.itemAtPosition(i, j)
# print "item(",i, j, "):", item
if type(item) == QtGui.QWidgetItem:
if type(item.widget()) == qt_type:
new_obj = [layout, i, j, item.widget()]
objects.append(new_obj)
elif type(layout) in [QtGui.QHBoxLayout, QtGui.QVBoxLayout]:
raise SyntaxError("ERROR: Find of Qt objects in QHBoxLayout or QVBoxLayout still not supported")
# for i in range(layout.count()):
# item = layout.itemAt(i)
return objects
def _replace_qlineedit_from_gridlayout(self, parent, qt_obj, layout, row, column):
print "old qt_obj", qt_obj
obj_name = qt_obj.objectName()
layout.removeWidget(qt_obj)
sip.delete(qt_obj)
qt_obj = LineEdit(parent)
qt_obj.setObjectName(obj_name)
layout.addWidget(qt_obj, row, column)
print "Replaced", obj_name, "with LineEdit"
print "new qt_obj", qt_obj
print "----------------------------------"
不要在运行时替换小部件：在 Qt Designer 中提升小部件，以便在生成 GUI 模块时自动将行编辑替换为您的自定义类。
以下是如何提升小部件以使用自定义类：
在 Qt Designer 中，选择所有要替换的行编辑，然后右键单击它们并选择“升级到...”。在对话框中，将“升级的类名称”设置为“LineEdit”，并将“头文件”设置为包含此类的模块的 python 导入路径（例如
myapp.LineEdit现在，当您使用 pyuic 重新生成 ui 模块时，您应该看到它使用您的自定义 LineEdit 类，并且文件底部会有一个额外的行，如下所示：
from myapp.LineEdit import LineEdit
我没有仔细阅读你的所有代码...
我的猜测是，即使您替换了布局中的小部件，
window.txt_line_1因此，添加
setattr(parent, obj_name, qt_obj);
到
_replace_qlineedit_from_gridlayout