ruby-****@sourc*****
ruby-****@sourc*****
2003年 11月 20日 (木) 02:54:12 JST
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REMOTE_ADDR = 208.197.227.51
REMOTE_HOST =
URL = http://ruby-gnome2.sourceforge.jp/?tut-treeview-selection-contextmenu
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= Context Menus
Context menus are context-dependent menus that pop up when a user right-clicks on a list or tree and usually let the user do something with the selected items or manipulate the list or tree in other ways.
Right-clicks on a tree view are caught just like mouse button clicks are caught with any other widgets, namely by connecting to the tree view's "button_press_event" signal handler (which is a Gtk::Widget signal, and as Gtk::TreeView is derived from Gtk::Widget it has this signal as well). Additionally, you should also connect to the "popup-menu" signal, so users can access your context menu without a mouse. The "popup-menu" signal is emitted when the user presses Shift-F10. Also, you should make sure that all functions provided in your context menu can also be accessed by other means such as the application's main menu. See the ((<GNOME Human Interface Guidelines (HIG)|URL: http://developer.gnome.org/projects/gup/hig/>)) for more details. Straight from the a-snippet-of-code-says-more-than-a-thousand-words-department, some code to look at:
# Create a menu
menu = Gtk::Menu.new
# Add an item with a silly callback
item = Gtk::MenuItem.new("Do Something")
item.signal_connect("activate") { puts "Did something!" }
menu.append(item)
# Popup the menu on right click
view.signal_connect("button_press_event") do |widget, event|
if event.kind_of? Gdk::EventButton and event.button == 3
menu.popup(nil, nil, event.button, event.time)
end
end
# Popup the menu on Shift-F10
view.signal_connect("popup_menu") { menu.popup (nil, nil, 0, Gdk::Event::CURRENT_TIME) }