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86 lines
2.5 KiB
C#
86 lines
2.5 KiB
C#
/*
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* Greenshot - a free and open source screenshot tool
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* Copyright (C) 2007-2016 Thomas Braun, Jens Klingen, Robin Krom
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*
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* For more information see: http://getgreenshot.org/
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* The Greenshot project is hosted on GitHub https://github.com/greenshot/greenshot
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 1 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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using Greenshot.Plugin.Drawing;
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using GreenshotPlugin.Interfaces.Drawing;
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namespace Greenshot.Memento
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{
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/// <summary>
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/// The ChangeFieldHolderMemento makes it possible to undo-redo an IDrawableContainer move
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/// </summary>
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public class ChangeFieldHolderMemento : IMemento
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{
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private IDrawableContainer _drawableContainer;
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private readonly IField _fieldToBeChanged;
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private readonly object _oldValue;
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public ChangeFieldHolderMemento(IDrawableContainer drawableContainer, IField fieldToBeChanged)
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{
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_drawableContainer = drawableContainer;
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_fieldToBeChanged = fieldToBeChanged;
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_oldValue = fieldToBeChanged.Value;
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}
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public void Dispose()
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{
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Dispose(true);
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}
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protected virtual void Dispose(bool disposing)
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{
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if (disposing)
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{
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_drawableContainer?.Dispose();
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}
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_drawableContainer = null;
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}
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public bool Merge(IMemento otherMemento)
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{
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ChangeFieldHolderMemento other = otherMemento as ChangeFieldHolderMemento;
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if (other != null)
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{
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if (other._drawableContainer.Equals(_drawableContainer))
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{
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if (other._fieldToBeChanged.Equals(_fieldToBeChanged))
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{
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// Match, do not store anything as the initial state is what we want.
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return true;
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}
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}
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}
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return false;
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}
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public IMemento Restore()
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{
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// Before
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_drawableContainer.Invalidate();
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ChangeFieldHolderMemento oldState = new ChangeFieldHolderMemento(_drawableContainer, _fieldToBeChanged);
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_fieldToBeChanged.Value = _oldValue;
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// After
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_drawableContainer.Invalidate();
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return oldState;
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}
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}
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}
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