/* 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 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_dialog_layout, [ layout_dialog/1 ]). :- use_module(library(pce)). :- require([ append/3 , delete/3 , forall/2 , get_chain/3 , ignore/1 , maplist/3 , member/2 , include/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]) :- include(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), maplist(make_row_alignment, Rows), maplist(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]), maplist(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).