forked from AuroraMiddleware/gtk
146 lines
5.2 KiB
C
146 lines
5.2 KiB
C
/* gtkconstraintsolverprivate.h: Constraint solver based on the Cassowary method
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* Copyright 2019 GNOME Foundation
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Author: Emmanuele Bassi
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*/
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#pragma once
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#include "gtkconstrainttypesprivate.h"
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G_BEGIN_DECLS
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#define GTK_TYPE_CONSTRAINT_SOLVER (gtk_constraint_solver_get_type())
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G_DECLARE_FINAL_TYPE (GtkConstraintSolver, gtk_constraint_solver, GTK, CONSTRAINT_SOLVER, GObject)
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/* Symbolic weight thresholds
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*
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* Constraint weights live on a continuum, but we use thresholds for simplicity's
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* sake, so we don't have to necessarily reason in terms of numeric values.
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*
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* The public API has a similar approach, where the symbolic constants are negative
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* values, and positive values are explicit weights. We map those values into
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* numeric values that the GtkConstraintSolver can plug into the linear equations
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* tableau.
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*/
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#define GTK_CONSTRAINT_WEIGHT_REQUIRED (make_weight (1000, 1000, 1000, 1))
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#define GTK_CONSTRAINT_WEIGHT_STRONG (make_weight ( 1, 0, 0, 1))
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#define GTK_CONSTRAINT_WEIGHT_MEDIUM (make_weight ( 0, 1, 0, 1))
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#define GTK_CONSTRAINT_WEIGHT_WEAK (make_weight ( 0, 0, 1, 1))
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G_GNUC_PURE
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static inline double
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make_weight (double a,
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double b,
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double c,
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double w)
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{
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double res = 0;
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res += CLAMP (a * w, 0, 1000) * 1000000;
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res += CLAMP (b * w, 0, 1000) * 1000;
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res += CLAMP (c * w, 0, 1000);
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return res;
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}
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GtkConstraintSolver *
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gtk_constraint_solver_new (void);
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void
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gtk_constraint_solver_freeze (GtkConstraintSolver *solver);
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void
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gtk_constraint_solver_thaw (GtkConstraintSolver *solver);
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void
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gtk_constraint_solver_resolve (GtkConstraintSolver *solver);
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GtkConstraintVariable *
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gtk_constraint_solver_create_variable (GtkConstraintSolver *solver,
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const char *prefix,
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const char *name,
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double value);
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GtkConstraintRef *
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gtk_constraint_solver_add_constraint (GtkConstraintSolver *solver,
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GtkConstraintVariable *variable,
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GtkConstraintRelation relation,
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GtkConstraintExpression *expression,
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double strength);
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void
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gtk_constraint_solver_remove_constraint (GtkConstraintSolver *solver,
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GtkConstraintRef *reference);
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GtkConstraintRef *
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gtk_constraint_solver_add_stay_variable (GtkConstraintSolver *solver,
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GtkConstraintVariable *variable,
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double strength);
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void
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gtk_constraint_solver_remove_stay_variable (GtkConstraintSolver *solver,
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GtkConstraintVariable *variable);
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gboolean
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gtk_constraint_solver_has_stay_variable (GtkConstraintSolver *solver,
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GtkConstraintVariable *variable);
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GtkConstraintRef *
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gtk_constraint_solver_add_edit_variable (GtkConstraintSolver *solver,
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GtkConstraintVariable *variable,
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double strength);
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void
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gtk_constraint_solver_remove_edit_variable (GtkConstraintSolver *solver,
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GtkConstraintVariable *variable);
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gboolean
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gtk_constraint_solver_has_edit_variable (GtkConstraintSolver *solver,
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GtkConstraintVariable *variable);
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void
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gtk_constraint_solver_suggest_value (GtkConstraintSolver *solver,
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GtkConstraintVariable *variable,
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double value);
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void
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gtk_constraint_solver_begin_edit (GtkConstraintSolver *solver);
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void
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gtk_constraint_solver_end_edit (GtkConstraintSolver *solver);
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void
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gtk_constraint_solver_note_added_variable (GtkConstraintSolver *self,
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GtkConstraintVariable *variable,
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GtkConstraintVariable *subject);
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void
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gtk_constraint_solver_note_removed_variable (GtkConstraintSolver *self,
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GtkConstraintVariable *variable,
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GtkConstraintVariable *subject);
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void
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gtk_constraint_solver_clear (GtkConstraintSolver *solver);
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char *
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gtk_constraint_solver_to_string (GtkConstraintSolver *solver);
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G_END_DECLS
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