Test

PrintPDF/PdfSharp/Drawing/GraphicsStateStack.cs

@@ -0,0 +1,98 @@
+#region PDFsharp - A .NET library for processing PDF
+//
+// Authors:
+//   Stefan Lange
+//
+// Copyright (c) 2005-2017 empira Software GmbH, Cologne Area (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.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)
+        {
+            _current = new InternalGraphicsState(gfx);
+        }
+
+        public int Count
+        {
+            get { return _stack.Count; }
+        }
+
+        public void Push(InternalGraphicsState state)
+        {
+            _stack.Push(state);
+            state.Pushed();
+        }
+
+        public int Restore(InternalGraphicsState state)
+        {
+            if (!_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 = _stack.Pop();
+            top.Popped();
+            while (top != state)
+            {
+                count++;
+                state.Invalid = true;
+                top = _stack.Pop();
+                top.Popped();
+            }
+            state.Invalid = true;
+            return count;
+        }
+
+        public InternalGraphicsState Current
+        {
+            get
+            {
+                if (_stack.Count == 0)
+                    return _current;
+                return _stack.Peek();
+            }
+        }
+
+        readonly InternalGraphicsState _current;
+
+        readonly Stack<InternalGraphicsState> _stack = new Stack<InternalGraphicsState>();
+    }
+}