/* $Id: layout.pl,v 1.11 2002/02/01 15:04:50 jan Exp $ 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): 1985-2002, University of Amsterdam This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA As a special exception, if you link this library with other files, compiled with a Free Software compiler, to produce an executable, this library does not by itself cause the resulting executable to be covered by the GNU General Public License. This exception does not however invalidate any other reasons why the executable file might be covered by the GNU General Public License. */ :- module(pce_dialog_layout, [ layout_dialog/1 ]). :- use_module(library(pce)). :- require([ append/3 , checklist/2 , delete/3 , forall/2 , get_chain/3 , ignore/1 , maplist/3 , member/2 , sublist/3 , subset/2 , subtract/3 ]). /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - To be recognised: 1) rows/columns of objects. Alignment: top/bottom/reference/center 2) nesting? - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ layout_dialog(D) :- send(D?graphicals, for_all, and(message(@arg1, right, @nil), message(@arg1, above, @nil), message(@arg1, left, @nil), message(@arg1, below, @nil))), get_chain(D, graphicals, Grs), get(D, overlay, Overlay), delete(Grs, Overlay, Items), make_rows(Items, Rows), sort_rows(Rows, Sorted), update_order(Sorted), make_alignments(Sorted), relate_dialog_items(Sorted), send(D, layout), send(Overlay, expose), send(D, fit). % make_rows/2 % Split list of graphicals into nested list of graphicals with % approximately the same Y make_rows([], []). make_rows([Gr1|Rest], [[Gr1|RestRow]|RestRows]) :- sublist(same_row(Gr1), Rest, RestRow), subtract(Rest, RestRow, Grs), make_rows(Grs, RestRows). same_row(Gr1, Gr2) :- get(Gr1, top_side, T1), get(Gr1, bottom_side, B1), get(Gr2, top_side, T2), get(Gr2, bottom_side, B2), Overlap is min(B1, B2) - max(T1, T2), Smallest is min(B1-T1, B2-T2), Overlap >= Smallest // 2. /******************************* * GEOMETRIC SORTS * *******************************/ % sort_rows/2 % Sort rows in accending y-direction. sort_rows(Rows, Sorted) :- maplist(sort_row, Rows, LSorted), maplist(key_with_top_side, LSorted, KeyedRows), keysort(KeyedRows, SortedKeyedRows), maplist(unkey, SortedKeyedRows, Sorted). % sort_row/1 % Sort row left-to-right sort_row(Row, Sorted) :- maplist(key_with_left_side, Row, KeyedRow), keysort(KeyedRow, SortedKeyedRow), maplist(unkey, SortedKeyedRow, Sorted). key_with_top_side(Row, Top-Row) :- Row = [Gr1|_], get(Gr1, top_side, Top). key_with_left_side(Gr, Left-Gr) :- get(Gr, left_side, Left). unkey(_-Value, Value). /******************************* * GRAPHICAL ORDER * *******************************/ % update_order/1 % Update the order of the graphical objects. update_order([]) :- !. update_order([H|T]) :- !, update_order(H), update_order(T). update_order(Ref) :- send(Ref, expose), send(Ref, auto_align, @on). /******************************* * ALIGNMENTS * *******************************/ % make_alignments/1 % Fix the alignments of the dialog items. make_alignments(Rows) :- forall(item(Item, Rows), ( get(Item, class_variable_value, alignment, Alignment), Alignment \== column -> send(Item, alignment, Alignment) ; send(Item, alignment, left) )), forall(item(Item, Rows), ( get(Item, auto_label_align, @on) -> ignore(send(Item, label_width, @default)) ; true )), make_column_alignments(Rows), checklist(make_row_alignment, Rows), checklist(make_y_references, Rows). make_column_alignments([]). make_column_alignments([_]). make_column_alignments([R1, R2|Rows]) :- ( R1 \== [], R2 \== [], has_column_alignment(R1, R2) -> align_columns(R1, R2) ; true ), make_column_alignments([R2|Rows]). has_column_alignment([], _) :- !. has_column_alignment(_, []) :- !. has_column_alignment([H1|T1], [H2|T2]) :- above(H1, H2), has_column_alignment(T1, T2). align_columns([], _) :- !. align_columns(_, []) :- !. align_columns([H1|T1], [H2|T2]) :- align_above(H1, H2), align_columns(T1, T2). align_above(I1, I2) :- send(I1, above, I2), send(I1, alignment, column), send(I2, alignment, column). above(Gr1, Gr2) :- ( \+ can_be_in_column(Gr1) ; \+ can_be_in_column(Gr2) ), !, fail. above(Gr1, Gr2) :- get(Gr1, auto_label_align, @on), get(Gr2, auto_label_align, @on), get(Gr1, label_format, right), get(Gr2, label_format, right), get(Gr1, left_side, L1), get(Gr1, label_width, W1), get(Gr2, left_side, L2), get(Gr2, label_width, W2), abs((L1+W1) - (L2+W2)) < 15. above(Gr1, Gr2) :- get(Gr1, left_side, L1), get(Gr2, left_side, L2), abs(L1 - L2) < 15. can_be_in_column(Gr) :- get(Gr, alignment, column), !. can_be_in_column(Gr) :- get(Gr, fixed_alignment, @off). make_row_alignment([_]) :- !. make_row_alignment(Row) :- findall(align_row(Sub, Alignment), row_alignment(Row, Sub, Alignment), Alignments), %format('~p~n', [Alignments]), delete_sub_alignments(Alignments, Alignments, Cleaned), %format('~p~n', [Cleaned]), checklist(call, Cleaned). delete_sub_alignments([], _, []). delete_sub_alignments([H|T], As, L) :- H = align_row(S1, _), length(S1, L1), member(align_row(S2, _), As), length(S2, L2), L1 < L2, subset(S1, S2), !, delete_sub_alignments(T, As, L). delete_sub_alignments([H|T], As, [H|L]) :- delete_sub_alignments(T, As, L). row_alignment(Row, Sub, Alignment) :- first(First, Row), get(First, device, Device), append(Before, R0, Row), left(Before, Device, LeftEdge), append(Sub, After, R0), Sub \== [], right(After, Device, RightEdge), \+((member(X, Sub), get(X, alignment, column))), left_to_right(Sub), first(Head, Sub), tail(Tail, Sub), get(Head, left_side, Left), get(Tail, right_side, Right), left_aligned(LeftEdge, RightEdge, Left, Right, LH), right_aligned(LeftEdge, RightEdge, Left, Right, RH), center_aligned(LeftEdge, RightEdge, Left, Right, CH), ( LH < RH, LH < CH -> Alignment = left ; RH < CH -> Alignment = right ; Alignment = center ). left([], Device, Left) :- get(Device?bounding_box, left_side, Left). left(L, _, Left) :- tail(T, L), % get(T, alignment, column), get(T, right_side, Left). right([], Device, Right) :- get(Device?bounding_box, right_side, Right). right(L, _, Right) :- first(H, L), % get(H, alignment, column), get(H, left_side, Right). % tail/2 is defined here as the system definitions of SICStus and % SWI-Prolog differ in the argument order. tail(Elem, [Elem]) :- !. tail(Elem, [_|T]) :- tail(Elem, T). first(H, [H|_]). align_row(Row, Alignment) :- forall(member(Gr, Row), send(Gr, alignment, Alignment)). left_to_right([]). left_to_right([_]). left_to_right([H1, H2|T]) :- get(H1, right_side, R), get(H2, left_side, L), L - R < 30, left_to_right([H2|T]). left_aligned(X, _W, Left, _Right, H) :- H is abs(X-Left). right_aligned(_X, W, _Left, Right, H) :- H is abs(Right - W). center_aligned(X, W, Left, Right, H) :- H is abs((Left+Right)//2 - ((X + W)//2)). % make_y_references/1 % Fix the (Y)-coordinate of the reference points make_y_references([]). make_y_references([_]). % 1 element: doesn't matter make_y_references(Row) :- forall((member(I, Row), get(I, fixed_reference, @off)), make_y_reference(I, Row)). make_y_reference(I, Row) :- findall(Proto, alignment_proto(I, Row, Proto), Protos), sort(Protos, [proto(_, I2, Side)|_]), !, get(I, top_side, Y1), get(I2, top_side, Y2), get(I, Side, S1), get(I2, Side, S2), get(I2?reference, y, YR), YR2 is (Y2-S2) + YR - (Y1-S1), get(I?reference, x, RX), send(I, reference, point(RX, YR2)). make_y_reference(_, _). alignment_proto(I1, Row, proto(H, I2, Side)) :- alignment_side(Side), member(I2, Row), I2 \== I1, get(I2, fixed_reference, @on), get(I1, Side, V1), get(I2, Side, V2), H is abs(V1 - V2). alignment_side(top_side). alignment_side(center_y). alignment_side(bottom_side). /******************************* * RELATE THE ITEMS * *******************************/ % relate_dialog_items/1 % Relate the dialog items top/bottom/left/right relate_dialog_items([]). relate_dialog_items([H|T]) :- relate_dialog_item_row(H), relate_dialog_item_rows(H, T), relate_dialog_items(T). relate_dialog_item_row([_]) :- !. relate_dialog_item_row([H1,H2|T]) :- send(H2, right, H1), relate_dialog_item_row([H2|T]). relate_dialog_item_rows(_, []) :- !. relate_dialog_item_rows([H1|_], [[H2|_]|_]) :- send(H2, below, H1). /******************************* * UTILITIES * *******************************/ item(Item, [Row|_]) :- member(Item, Row). item(Item, [_|T]) :- item(Item, T).