/* 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).