PyQt：在窗口上显示 QTextEdits
我想在主窗口的任意位置显示一些 QTextEdit。以下是我的第一次尝试。这不太管用。如果我在显示窗口之前创建文本编辑，则文本编辑会出现，但如果我在显示窗口之后创建文本编辑，则文本编辑不会出现。这是怎么回事？如何让稍后创建的内容显示出来？
import sys, random
from PyQt4 import QtGui, QtCore
app = QtGui.QApplication(sys.argv)
win = QtGui.QMainWindow()
win.resize(500,500)
def new_text():
print "new text"
text = QtGui.QTextEdit(win)
text.move(random.random() * 400, random.random() * 400)
for i in range(3):
new_text()
timer = QtCore.QTimer()
timer.connect(timer, QtCore.SIGNAL("timeout()"), new_text)
timer.start(500)
win.show()
app.exec_()
I want to display some QTextEdits over my main window at arbitrary locations. Below is my first attempt. It doesn't quite work. If I create the text edits before I show the window, the text edits appear, but if I create them after I have shown the window they don't appear. What's up with that? How can I get the ones created later to show up?
import sys, random
from PyQt4 import QtGui, QtCore
app = QtGui.QApplication(sys.argv)
win = QtGui.QMainWindow()
win.resize(500,500)
def new_text():
print "new text"
text = QtGui.QTextEdit(win)
text.move(random.random() * 400, random.random() * 400)
for i in range(3):
new_text()
timer = QtCore.QTimer()
timer.connect(timer, QtCore.SIGNAL("timeout()"), new_text)
timer.start(500)
win.show()
app.exec_()
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哦，我明白了。您必须在每个小部件出现之前调用 show 。我猜想 QMainWindow.show 递归地调用其所有子项的方法。因此，只需将 text.show() 添加到 new_text 函数的末尾即可运行。
Oh, I got it. You have to call show on each widget before it appears. I guess QMainWindow.show recursively calls the method for all of its children. So just add text.show() to the end of the new_text function and it works.