Major API changes about the saving of mime parts

Saving the mime part (saving an attachment or a message) isn't
implemented in the gtk+ default types anymore.

That simply because the ui for saving it is obviously going to be
specific per E-mail client.

Mine used a popup-menu, but that doesn't mean that for example Modest
should be forced to also use the same popup or reimplement its own
message view component.

So I completed the strategy pattern by introducing a client or a
strategy caller: like the IFlyable and IFlyStrategy of Duck, Plane and
Bird which would have FlyWithAnimalWingsStrategy, CantFlyStrategy and
FlyWithMetalWingsStrategy and whatever.

I created that IFlyable type: TnyMimePartSaver

What one could do to create a viewer that can alos save a mime part,
like what the original TnyGtkMsgView did, would be to (for example)
inherit the TnyGtkMsgView and implement the TnyMimePartSaver interface.

class MyOwnMsgView extends TnyGtkMsgView implements TnyMimePartSaver
	private Button save_button;
	private Tny.SaveStrategy saver;

	public MyOwnMsgView ()
		this.save_button = new Button ();

		this.save_button.Clicked ... = on_save_button_clicked;

	public Tny.SaveStrategy get_save_strategy ()
		if (this.saver == null)
			this.saver = new TnyGtk.SaveStrategy ();

		return this.saver;

	public void set_save_strategy (Tny.SaveStrategy s)
		this.saver = s;

	public void perform_save (Tny.MimePart part)
		this.get_save_strategy ().save (part);

	public void on_save_button_clicked (object sender, ...)
		this.perform_save (super.get_msg());

Philip Van Hoof, software developer at x-tend 
home: me at pvanhoof dot be 
gnome: pvanhoof at gnome dot org 
work: vanhoof at x-tend dot be -

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