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function [stop, reason] = stopifclosedfigure(problem, x, info, last) %#ok<INUSL>
% Create an interactive stopping criterion based on a figure closing
% function stopfun = stopifclosedfigure()
% Use on the options structure passed to a Manopt solver, e.g.:
% problem = ... % manopt problem structure with manifold, cost function, ...
% options.stopfun = @stopifclosedfigure; % add this option
% trustregions(problem, x0, options); % run this or any other solver
% This will create a figure. If this figure is closed at any time during
% the solver's execution, the solver will terminate gracefully and return
% its current iterate as soon as it gets to the point of evaluating the
% stopping criteria.
% Note: certain solvers (including trustregions) check stopping criteria
% only at outer iterations, not during inner iterations; hence, their may
% be a delay before actual termination.
% See also: statsfunhelper stopifdeletedfile
% This file is part of Manopt:
% Original author: Nicolas Boumal, Aug. 3, 2018.
% Contributors:
% Change log:
reason = 'Interactive stopping criterion: figure closed.';
% Fix a likely unique figure id.
figureid = 1465489213;
% If first iteration, create a figure to capture interaction.
if last == 1
h = figure(figureid);
set(h, 'Name', 'Close to stop Manopt solver', 'NumberTitle', 'off');
text(0, 0, 'Close me to stop the Manopt solver.', 'FontSize', 16);
axis tight;
axis off;
set(h, 'color', 'w');
% Call to drawnow() ensures that, if the user closed the figure, then
% that information will have been refreshed. This may create small
% delays, but on the other hand interactive stopping criteria are
% mostly useful for costly problems where this overhead should be
% marginal.
if ~ishandle(figureid) % If the figure was closed, stop.
stop = true;
stop = false;
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