Sifflet.UI.Callback

The CBMgr (Callback manager) encapsulates (in an enclosure, no less!) an IORef VPUI. It is used *solely* to set up callbacks and similar stuff in Gtk, where the callback needs access to the IORef. By passing a CBMgr to a function, we can avoid passing the IORef directly, and all the harm and confusion that could result.

We only need *one* CBMgr for the application; however, two CBMgrs with the same IORef are logically equivalent, so there would be no harm in having two as long as they share one IORef.

data CBMgrCmd

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Commands for the CBMgr

Constructors

OnWindowConfigure Window (IORef VPUI -> EventM EConfigure Bool)
OnWindowDestroy Window (IORef VPUI -> IO ())
OnWindowKeyPress Window (IORef VPUI -> EventM EKey Bool)
OnLayoutExpose Layout (IORef VPUI -> EventM EExpose Bool)
OnLayoutMouseMove Layout (IORef VPUI -> EventM EMotion Bool)
OnLayoutButtonPress Layout (IORef VPUI -> EventM EButton Bool)
OnLayoutButtonRelease Layout (IORef VPUI -> EventM EButton Bool)
OnMenuItemActivateLeaf MenuItem (VPUI -> IO VPUI)
OnEntryActivate Entry (IORef VPUI -> IO ())
AfterButtonClicked Button (IORef VPUI -> IO ())
UMTest

mkCBMgr :: IORef VPUI -> CBMgr

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Create the CBMgr

data MenuSpec

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Constructors

MenuSpec String [MenuItemSpec]

data MenuItemSpec

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Constructors

MenuItem String MenuItemAction
SubMenu MenuSpec

type MenuItemAction = VPUI -> IO VPUI

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createMenuBar :: [MenuSpec] -> CBMgr -> IO MenuBar

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addMenu :: MenuBar -> CBMgr -> MenuSpec -> IO ()

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createMenu :: MenuSpec -> CBMgr -> IO Menu

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createMenuItem :: Menu -> CBMgr -> MenuItemSpec -> IO ()

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modifyIORefIO :: IORef a -> (a -> IO a) -> IO ()

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Read an IORef, update with IO, and write the updated value. This is like modifyIORef, but the type of the second argument is (a -> IO a) instead of (a -> a).

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