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73 lines
2.3 KiB
C#
73 lines
2.3 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 System;
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using Greenshot.Drawing;
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using Greenshot.Plugin.Drawing;
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namespace Greenshot.Memento {
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/// <summary>
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/// The DeleteElementMemento makes it possible to undo deleting an element
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/// </summary>
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public class DeleteElementMemento : IMemento {
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private IDrawableContainer drawableContainer;
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private readonly Surface surface;
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public DeleteElementMemento(Surface surface, IDrawableContainer drawableContainer) {
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this.surface = surface;
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this.drawableContainer = drawableContainer;
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}
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public void Dispose() {
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Dispose(true);
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GC.SuppressFinalize(this);
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}
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protected virtual void Dispose(bool disposing) {
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if (disposing) {
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if (drawableContainer != null) {
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drawableContainer.Dispose();
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drawableContainer = null;
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}
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}
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}
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public bool Merge(IMemento otherMemento) {
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return false;
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}
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public IMemento Restore() {
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// Before
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drawableContainer.Invalidate();
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AddElementMemento oldState = new AddElementMemento(surface, drawableContainer);
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surface.AddElement(drawableContainer, false);
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// The container has a selected flag which represents the state at the moment it was deleted.
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if (drawableContainer.Selected) {
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surface.SelectElement(drawableContainer);
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}
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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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