lijian wrote: > Hi all, > > I know that with some special conditions, some menus will be disabled and > turn grey. > But when I select any anchor object, text frame for example, all the > textshell related menus > such as insert-bookmark/footnot/symbols... will be disabled. > > Could anybody give me help on this problem ? I wonder how this is achieved.
This is the SFX "shell" feature. All commands in toolbars, menus etc. are called "Slots" in sfx2. An object that is able to execute commands or give status information about it (enabled/disabled or on/off etc.) is called a "Shell". Each View managed by sfx2 has an object called "Dispatcher" that maintains a stack of Shell objects. The Dispatcher has a partner called "Bindings" that is a contact object for UI controls where they can register to get a handler for the slot they represent. The Bindings object uses its Dispatcher to find such handlers, ask them for status information or to execute a command. When the Dispatchcer searches a shell that supports a particular slot, it goes through its stack of shells and takes the first one that declares itself able to handle this slot. By pushing and popping different shells on or from the stack, the application can create different UI contexts that automatically enable or disable slots (commands) depending on the selection. As an example, when Writer is in text editing mode, the stack looks as follows: TextShell ViewShell ViewFrame ObjectShell Module Application So each time sfx looks for a "slot server" it first will check the TextShell, then the ViewShell etc. When now a graphic is selected, the TextShell is popped from the stack and a GraphicShell is pushed, making the stack look GraphicShell ViewShell ViewFrame ObjectShell Module Application So suddenly all slots only handled by a TextShell won't be found on the stack and in that case the Bindings object will send a "Disabled" status to its registered controls. OTOH, new slots are being found now and the related controls now will switch to an "enabled" state. You can read more about that here: http://wiki.services.openoffice.org/wiki/Framework/Article/Implementation_of_the_Dispatch_API_In_SFX2 Best regards, Mathias -- Mathias Bauer (mba) - Project Lead OpenOffice.org Writer OpenOffice.org Engineering at Sun: http://blogs.sun.com/GullFOSS Please don't reply to "nospamfor...@gmx.de". I use it for the OOo lists and only rarely read other mails sent to it. --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@sw.openoffice.org For additional commands, e-mail: dev-h...@sw.openoffice.org
