98 lines
3.0 KiB
C#
98 lines
3.0 KiB
C#
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#region PDFsharp - A .NET library for processing PDF
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//
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// Authors:
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// Stefan Lange
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//
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// Copyright (c) 2005-2017 empira Software GmbH, Cologne Area (Germany)
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//
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// http://www.pdfsharp.com
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// http://sourceforge.net/projects/pdfsharp
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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#endregion
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using System;
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using System.Collections.Generic;
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#if GDI
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using System.Drawing;
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using System.Drawing.Drawing2D;
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#endif
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#if WPF
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using System.Windows.Media;
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#endif
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namespace PdfSharp.Drawing
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{
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/// <summary>
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/// Represents a stack of XGraphicsState and XGraphicsContainer objects.
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/// </summary>
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internal class GraphicsStateStack
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{
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public GraphicsStateStack(XGraphics gfx)
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{
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_current = new InternalGraphicsState(gfx);
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}
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public int Count
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{
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get { return _stack.Count; }
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}
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public void Push(InternalGraphicsState state)
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{
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_stack.Push(state);
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state.Pushed();
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}
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public int Restore(InternalGraphicsState state)
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{
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if (!_stack.Contains(state))
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throw new ArgumentException("State not on stack.", "state");
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if (state.Invalid)
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throw new ArgumentException("State already restored.", "state");
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int count = 1;
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InternalGraphicsState top = _stack.Pop();
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top.Popped();
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while (top != state)
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{
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count++;
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state.Invalid = true;
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top = _stack.Pop();
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top.Popped();
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}
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state.Invalid = true;
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return count;
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}
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public InternalGraphicsState Current
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{
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get
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{
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if (_stack.Count == 0)
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return _current;
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return _stack.Peek();
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}
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}
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readonly InternalGraphicsState _current;
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readonly Stack<InternalGraphicsState> _stack = new Stack<InternalGraphicsState>();
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}
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}
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