使用單一的Python Def爲多點QpushButton基於點擊

Question

我正在做一個有很多按鈕的GUI。一次有多個選擇選項。

我想知道如何與Clicked()按鈕名稱連接一個Python防守對所有按鈕的ARG？

Answer 1

使用QButtonGroup及其buttonClicked信號。你會得到id或QPushButton本身。

編輯

一個簡單的例子：

import sys 
from PyQt4 import QtGui 

class Widget(QtGui.QWidget): 
    def __init__(self, parent=None): 
     super(Widget, self).__init__(parent) 

     # Arrange buttons horizontally 
     buttonLayout = QtGui.QHBoxLayout() 

     # QButtonGroup to keep track of buttons 
     self.buttonGroup = QtGui.QButtonGroup() 

     # Connect the 'buttonClicked' signal 'self.setLabel' 
     # There are two overloads for 'buttonClicked' signal: QAbstractButton (button itself) or int (id) 
     # Specific overload for the signal is selected via [QtGui.QAbstractButton] 
     # Clicking any button in the QButtonGroup will send this signal with the button 
     self.buttonGroup.buttonClicked[QtGui.QAbstractButton].connect(self.setLabel) 

     for i in range(5): # Let's create 5 button 
      button = QtGui.QPushButton('%d' % i)  # make a button 
      buttonLayout.addWidget(button)   # add to layout 
      self.buttonGroup.addButton(button)  # add to QButtonGroup 
      #self.buttonGroup.addButton(button, i) # You can give an 'id' if you like 

     self.label = QtGui.QLabel() # just to write some output 

     # lay everything out 
     layout = QtGui.QVBoxLayout() 
     layout.addLayout(buttonLayout) 
     layout.addWidget(self.label) 
     self.setLayout(layout) 

    def setLabel(self, button): 
     # clicking any button will call this slot 
     # 'button' argument will be the button itself 
     # so... let's show its text in the label: 
     self.label.setText('You clicked button with text "%s"' % button.text()) 


if __name__ == '__main__': 
    app = QtGui.QApplication(sys.argv) 
    widget = Widget() 
    widget.show() 
    app.exec_() 

Answer 2

一個簡單的方法是創建小功能 - 其可以是lambda表達式，或物體通過functools.partial作爲返回 - 被連接到所述實際的Qt事件。這些小功能依次調用你的主要的回調，傳遞儘可能多的參數，只要你喜歡：

# coding: utf-8 

from PyQt4 import QtCore, QtGui 

app = QtGui.QApplication([]) 
window = QtGui.QWidget() 
grid = QtGui.QGridLayout() 

def callback(button): 
    print button 

for x in range(10): 
    b = QtGui.QPushButton() 
    b.setText(unicode(x)) 
    grid.addWidget(b, 0, x) 
    window.connect(b, QtCore.SIGNAL("clicked()"), (lambda y:lambda: callback(y))(x)) 
    b.show() 

window.setLayout(grid) 
window.show() 
app.exec_() 

通知您必須使用「封閉拉姆達」在實際工作拉姆達這是回調， 以爲每個循環迭代「凍結」x的值。如果連接調用的表達式僅在lambda: callback(x)，x將在按鍵時間被評估，並且因此將是9，在這種情況下，對於所有按鈕。

主要callback功能，但是，僅僅是一個，就像你問。