wxPython - SetSubMenu() function in wx.MenuItem

wxPython - SetSubMenu() function in wx.MenuItem

In wxPython, the SetSubMenu() function is used with wx.MenuItem to associate a submenu with a menu item. This is how you create cascading or hierarchical menus.

Here's a step-by-step guide to demonstrate its usage:

  1. Create a menu bar.
  2. Add a main menu to the menu bar.
  3. Create a menu item for the main menu.
  4. Create a submenu.
  5. Add items to the submenu.
  6. Associate the submenu with the menu item using SetSubMenu().
  7. Append the main menu item to the main menu.

Below is a sample implementation:

import wx class MyFrame(wx.Frame): def __init__(self, parent, title): super(MyFrame, self).__init__(parent, title=title, size=(400, 300)) self.InitUI() def InitUI(self): # Create a menu bar menuBar = wx.MenuBar() # Create a main menu mainMenu = wx.Menu() # Create a menu item for the main menu menuItemWithSubmenu = wx.MenuItem(mainMenu, wx.ID_ANY, "Item with Submenu") # Create a submenu submenu = wx.Menu() submenu.Append(wx.ID_ANY, "Submenu item 1") submenu.Append(wx.ID_ANY, "Submenu item 2") # Associate the submenu with the menu item menuItemWithSubmenu.SetSubMenu(submenu) # Append the menu item with its submenu to the main menu mainMenu.Append(menuItemWithSubmenu) # Add main menu to the menu bar menuBar.Append(mainMenu, "Main Menu") # Set the frame's menu bar self.SetMenuBar(menuBar) app = wx.App(False) frame = MyFrame(None, "wx.MenuItem with Submenu") frame.Show() app.MainLoop()

In this example, when you run the application, you'll see a menu labeled "Main Menu" on the menu bar. Hovering or clicking on "Item with Submenu" will reveal its associated submenu containing "Submenu item 1" and "Submenu item 2".

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