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#region PDFsharp - A .NET library for processing PDF
//
// Authors:
// Stefan Lange (mailto:Stefan.Lange@pdfsharp.com)
//
// Copyright (c) 2005-2008 empira Software GmbH, Cologne (Germany)
//
// http://www.pdfsharp.com
// http://sourceforge.net/projects/pdfsharp
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
#endregion
using System;
using System.Diagnostics;
using System.Collections.Generic;
#if GDI
using System.Drawing;
using System.Drawing.Drawing2D;
#endif
#if WPF
using System.Windows.Media;
#endif
namespace PdfSharp.Drawing
{
/// <summary>
/// Represents a stack of XGraphicsState and XGraphicsContainer objects.
/// </summary>
internal class GraphicsStateStack
{
public GraphicsStateStack(XGraphics gfx)
{
this.current = new InternalGraphicsState(gfx);
}
public int Count
{
get { return this.stack.Count; }
}
public void Push(InternalGraphicsState state)
{
this.stack.Push(state);
state.Pushed();
}
public int Restore(InternalGraphicsState state)
{
if (!this.stack.Contains(state))
throw new ArgumentException("State not on stack.", "state");
if (state.invalid)
throw new ArgumentException("State already restored.", "state");
int count = 1;
InternalGraphicsState top = (InternalGraphicsState)this.stack.Pop();
top.Popped();
while (top != state)
{
count++;
state.invalid = true;
top = (InternalGraphicsState)this.stack.Pop();
top.Popped();
}
state.invalid = true;
return count;
}
public InternalGraphicsState Current
{
get
{
if (this.stack.Count == 0)
return this.current;
return this.stack.Peek();
}
}
InternalGraphicsState current;
Stack<InternalGraphicsState> stack = new Stack<InternalGraphicsState>();
}
}
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