button.ispressed

这是一个 Python 代码片段，用于检查按钮是否被按下。前提是已经定义了一个名为 `button` 的按钮对象，并且该对象具有 `ispressed` 属性。如果该属性值为 `True`，则表示按钮已被按下；否则，按钮未被按下。以下是一个示例代码片段：

if button.ispressed:
    print("Button is pressed!")
else:
    print("Button is not pressed.")

相关问题

/** * An extension to JButton that binds the button action to a Driver object, * which must feature a method called buttonPressed() * * @author M. Allen */ import javax.swing.*; import java.awt.event.*; @SuppressWarnings( "serial" ) public class EventButton extends JButton implements ActionListener { private Calculator calculator; /** * pre: Driver d must be instantiated && must contain a method called * buttonPressed(). * post: This button can respond to action events and run the Driver method * buttonPressed(). * * @param d Driver with which this button communicates. */ public EventButton( Calculator c ) { super(); addActionListener( this ); calculator = c; } /** * post: If this button is pressed, the driver method buttonPressed() is * called to respond to the button presss event. * * @param e : ActionEvent from associated objects */ public void actionPerformed( ActionEvent e ) { calculator.buttonPressed( this ); } }

这段代码是一个继承自JButton的类EventButton，它绑定了按钮的操作到一个Calculator对象上，并要求该对象具有名为buttonPressed()的方法。当按钮被按下时，将调用Calculator对象的buttonPressed()方法来响应按钮按下事件。这段代码实现了基本的MVC模式中的控制器部分。

Write a simple GUI program with a button that responds to events from a mouse being pressed and released. The button should display: • the message “No action” when no action is taken on the mouse. • the message “Pressing down” when the mouse is pressed.

Here's a simple GUI program in Python using the tkinter module that displays a button and responds to mouse events:

import tkinter as tk

class MouseButtonApp:
    def __init__(self):
        self.window = tk.Tk()
        self.button = tk.Button(self.window, text="No action", command=self.no_action)
        self.button.pack()
        self.button.bind("<Button-1>", self.press_down)
        self.button.bind("<ButtonRelease-1>", self.release_up)
        
    def run(self):
        self.window.mainloop()

    def no_action(self):
        self.button.configure(text="No action")

    def press_down(self, event):
        self.button.configure(text="Pressing down")

    def release_up(self, event):
        self.button.configure(text="No action")

app = MouseButtonApp()
app.run()

The `MouseButtonApp` class defines a window with a button, which initially displays "No action." The button is bound to two mouse events: `<Button-1>` for when the left mouse button is pressed down, and `<ButtonRelease-1>` for when it is released. When the button is pressed down, its text is changed to "Pressing down," and when it is released, it is changed back to "No action."