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/* Part of XPCE --- The SWI-Prolog GUI toolkit
Author: Jan Wielemaker and Anjo Anjewierden
E-mail: jan@swi.psy.uva.nl
WWW: http://www.swi.psy.uva.nl/projects/xpce/
Copyright (c) 2003-2011, University of Amsterdam
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
:- module(pce_unclip, []).
:- use_module(library(pce)).
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
This library deals with showing graphicals that are partly clipped by
the window on which they are displayed. It is used by the class
toc_image from library(pce_toc) to show nodes that (typically) have
their right-side clipped and provides a convient mechanism to deal with
a few long labels in a relatively small window.
It is upto the clipped graphical to detect the mouse is positioned over
it and part of the graphical is clipped. The method
`graphical->clipped_by_window' can be used to detect the graphical is
(partly) obscured.
For an example, please start the SWI-Prolog manual browser using ?-
help. The source-code that attaches this library is in
`toc_image->entered'.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
:- pce_extend_class(graphical).
clipped_by_window(Gr) :->
"Test if graphical is clipped by window border"::
get(Gr, window, Window),
get(Window, visible, Visible),
get(Gr, absolute_position, Window, point(X,Y)),
get(Gr, area, area(_,_,W,H)),
\+ send(Visible, inside, area(X,Y,W,H)).
:- pce_end_class(graphical).
/*******************************
* INVISIBLE *
*******************************/
:- pce_global(@unclip_window, new(pce_unclip_window)).
:- pce_begin_class(pce_unclip_window, window).
variable(handler, handler, get, "Handler used to fetch all events").
variable(busy, bool := @off, none, "Handling attach/detach?").
class_variable(background, colour, azure).
initialise(W) :->
send_super(W, initialise),
get(W, frame, Fr),
send(Fr, kind, popup),
send(Fr, sensitive, @off),
send(W, pen, 0),
send(Fr, border, 1),
send(Fr?tile, border, 0),
send(W, slot, handler,
handler(any, message(W, unclipped_event, @event))).
attach(W, To:graphical) :->
"Attach to graphical"::
( get(W, slot, busy, @off)
-> send(W, slot, busy, @on),
call_cleanup(attach(W, To),
send(W, slot, busy, @off))
; true
).
attach(W, To) :-
get(To, window, ToWindow),
( get(W, hypered, mirroring, Old)
-> send(W, delete_hypers, mirroring),
( get(Old, window, ToWindow)
-> true
; send(Old, grab_pointer, @off),
send(ToWindow, grab_pointer, @on)
)
; get(W, handler, H),
send(ToWindow, grab_pointer, @on),
send(@display?inspect_handlers, prepend, H)
),
new(_, hyper(To, W, mirror, mirroring)),
send(W, update),
get(To, display_position, point(X,Y)),
( get(@pce, window_system, windows)
-> Border = 0 % TBD: Fix inside kernel
; get(W, border, Border)
),
send(W, open, point(X-Border,Y-Border)),
send(W, expose).
update(W) :->
"Update for changed receiver"::
send(W, clear),
( get(W, hypered, mirroring, Gr)
-> get(Gr, clone, Clone),
( get(@pce, window_system, windows)
-> get(Clone, size, size(W0, H0)),
send(W, size, size(W0+1, H0+1))
; get(Clone, size, Size),
send(W, size, Size)
),
send(Clone, set, 0, 0),
send(W, display, Clone)
; true
).
detach(W) :->
"Detach and hide"::
( get(W, slot, busy, @off)
-> send(W, slot, busy, @on),
call_cleanup(detach(W),
send(W, slot, busy, @off))
; true
).
detach(W) :-
( get(W, hypered, mirroring, Gr)
-> send(W, delete_hypers, mirroring),
send(W, clear),
send(W, show, @off),
get(W, handler, H),
send(Gr?window, grab_pointer, @off),
send(@display?inspect_handlers, delete, H)
; true
).
unclipped_event(W, Ev:event) :->
( send(Ev, is_a, loc_move),
( \+ send(Ev, inside, W)
; get(W, hypered, mirroring, Gr),
\+ send(Ev, inside, Gr?window)
)
-> send(W, detach)
; ( send(Ev, is_a, button)
; send(Ev, is_a, keyboard)
; send(Ev, is_a, wheel)
)
-> send(W, detach),
fail % normal event-processing
).
:- pce_end_class(pce_unclip_window).
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