92 lines
2.4 KiB
C#
92 lines
2.4 KiB
C#
/*
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* dbMango
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*
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* Copyright 2025 Deutsche Bank AG
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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namespace Rms.Risk.Mango.Pivot.Core.Models;
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public class Navigation<T>(Action<PivotDefinition, T> apply) where T : class
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{
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private class NavigationRecord
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{
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public PivotDefinition? Def { get; init; }
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public T? Data { get; init; }
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public override string ToString() => $"{Def?.Name} Hash={Def?.GetHashCode():X}";
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}
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private readonly Action<PivotDefinition,T> _apply = apply;
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private readonly Stack<NavigationRecord> _backStack = new();
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private readonly Stack<NavigationRecord> _forwardStack = new();
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private NavigationRecord? _current;
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public bool CanGoBackward => _backStack.Count > 0;
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public bool CanGoForward => _forwardStack.Count > 0;
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public void Add( PivotDefinition defToAdd, T data )
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{
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var rec = new NavigationRecord
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{
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Def = defToAdd,
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Data = data
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};
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if ( _current != null )
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_backStack.Push( _current );
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_current = rec;
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_forwardStack.Clear();
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}
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public void Clear()
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{
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_current = null;
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_backStack.Clear();
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_forwardStack.Clear();
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}
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public bool Back()
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{
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if (_backStack.Count == 0)
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return false;
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var rec = _backStack.Pop();
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if ( _current != null )
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_forwardStack.Push( _current );
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Apply( rec );
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return true;
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}
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public bool Forward()
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{
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if (_forwardStack.Count == 0)
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return false;
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var rec = _forwardStack.Pop();
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if ( _current != null )
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_backStack.Push( rec );
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Apply( rec);
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return true;
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}
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private void Apply( NavigationRecord rec )
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{
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_current = rec;
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_apply(rec.Def!, rec.Data!);
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}
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} |