Separate clipboard modification from Window interface

Issue by slimsag Wednesday Nov 26, 2014 at 00:35 GMT Originally opened as https://github.com/azul3d/gfx/issues/51

Today to implement window.Window you must provide a string-based clipboard implementation as well:

// Window represents a single window that graphics can be rendered to. The
 // window is safe for use concurrently from multiple goroutines.
 type Window interface {
        ...
        // SetClipboard sets the clipboard string.
        SetClipboard(clipboard string)

        // Clipboard returns the clipboard string.
        Clipboard() string
        ...
}

This is unfortunate because one might be able to implement a Window in places where implementing a clipboard is not doable or easy. We could separate clipboard features into a separate interface, however:

type Clipboard interface {
    // SetClipboard sets the clipboard string.
    SetClipboard(clipboard string)

    // Clipboard returns the clipboard string.
    Clipboard() string
}

Then to test if a window.Window supports modifying the clipboard, you can simply:

cb, ok := win.(window.Clipboard)
if ok {
        // We have clipboard access.
        cb.SetClipboard("Hello World!")
}

This is also a good way that we could provide access to further clipboard data types (for example window.ClipboardImage, for image data perhaps).

azul3d / engine

Separate clipboard modification from Window interface #106