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#region MigraDoc - Creating Documents on the Fly
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//
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// Authors:
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// Stefan Lange
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// Klaus Potzesny
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// David Stephensen
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//
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// Copyright (c) 2001-2017 empira Software GmbH, Cologne Area (Germany)
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//
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// http://www.pdfsharp.com
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// http://www.migradoc.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 MigraDoc.DocumentObjectModel.publics;
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namespace MigraDoc.DocumentObjectModel.Shapes
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{
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/// <summary>
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/// Represents the top position in a shape.
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/// </summary>
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public struct TopPosition : INullableValue
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{
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/// <summary>
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/// Initializes a new instance of TopPosition from Unit.
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/// </summary>
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private TopPosition(Unit value)
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{
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_shapePosition = ShapePosition.Undefined;
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_position = value;
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_notNull = !value.IsNull;
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}
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/// <summary>
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/// Initializes a new instance of TopPosition from ShapePosition.
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/// </summary>
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private TopPosition(ShapePosition value)
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{
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if (!(IsValid(value) || value == ShapePosition.Undefined))
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throw new ArgumentException(DomSR.InvalidEnumForTopPosition);
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_shapePosition = value;
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_position = Unit.NullValue;
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_notNull = (value != ShapePosition.Undefined);
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}
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/// <summary>
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/// Indicates the given shapePosition is valid for TopPosition.
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/// </summary>
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private static bool IsValid(ShapePosition shapePosition)
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{
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return shapePosition == ShapePosition.Bottom ||
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shapePosition == ShapePosition.Top ||
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shapePosition == ShapePosition.Center;
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}
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/// <summary>
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/// Converts a ShapePosition to a TopPosition.
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/// </summary>
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public static implicit operator TopPosition(ShapePosition value)
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{
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return new TopPosition(value);
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}
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/// <summary>
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/// Converts a Unit to a TopPosition.
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/// </summary>
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public static implicit operator TopPosition(Unit val)
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{
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return new TopPosition(val);
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}
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/// <summary>
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/// Converts a string to a TopPosition.
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/// The string is interpreted as a Unit.
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/// </summary>
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public static implicit operator TopPosition(string value)
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{
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Unit unit = value;
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return new TopPosition(unit);
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}
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/// <summary>
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/// Converts a double to a TopPosition.
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/// The double is interpreted as a Unit in Point.
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/// </summary>
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public static implicit operator TopPosition(double value)
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{
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Unit unit = value;
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return new TopPosition(unit);
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}
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/// <summary>
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/// Converts an integer to a TopPosition.
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/// The integer is interpreted as a Unit in Point.
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/// </summary>
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public static implicit operator TopPosition(int value)
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{
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Unit unit = value;
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return new TopPosition(unit);
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}
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/// <summary>
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/// Sets shapeposition enum and resets position.
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/// </summary>
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private void SetFromEnum(ShapePosition shapePosition)
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{
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if (!IsValid(shapePosition))
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throw new ArgumentException(DomSR.InvalidEnumForTopPosition);
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_shapePosition = shapePosition;
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_position = Unit.NullValue;
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}
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/// <summary>
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/// Sets the Position from a Unit.
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/// </summary>
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private void SetFromUnit(Unit unit)
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{
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_shapePosition = ShapePosition.Undefined;
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_position = unit;
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}
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/// <summary>
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/// Sets the Position from an object.
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/// </summary>
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void INullableValue.SetValue(object value)
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{
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if (value == null)
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throw new ArgumentNullException("value");
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if (value is ShapePosition)
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SetFromEnum((ShapePosition)value);
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else if (value is string && Enum.IsDefined(typeof(ShapePosition), value))
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SetFromEnum((ShapePosition)Enum.Parse(typeof(ShapePosition), (string)value, true));
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else
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SetFromUnit(value.ToString());
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_notNull = true;
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}
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/// <summary>
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/// Gets the Position as Unit or ShapePosition.
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/// </summary>
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object INullableValue.GetValue()
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{
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if (_shapePosition == ShapePosition.Undefined)
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return _position;
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return _shapePosition;
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}
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/// <summary>
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/// Resets this instance, i.e. IsNull() will return true afterwards.
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/// </summary>
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void INullableValue.SetNull()
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{
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this = new TopPosition();
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}
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/// <summary>
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/// Determines whether this instance is null (not set).
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/// </summary>
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bool INullableValue.IsNull
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{
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get { return !_notNull; }
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}
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bool _notNull;
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/// <summary>
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/// Gets the value of the position in unit.
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/// </summary>
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public Unit Position
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{
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get { return _position; }
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}
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public Unit _position;
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/// <summary>
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/// Gets the value of the position.
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/// </summary>
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public ShapePosition ShapePosition
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{
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get { return _shapePosition; }
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}
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public ShapePosition _shapePosition;
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/// <summary>
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/// Parses the specified value.
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/// </summary>
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public static TopPosition Parse(string value)
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{
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if (String.IsNullOrEmpty(value))
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throw new ArgumentNullException("value");
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value = value.Trim();
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char ch = value[0];
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if (ch == '+' || ch == '-' || Char.IsNumber(ch))
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return Unit.Parse(value);
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return (ShapePosition)Enum.Parse(typeof(ShapePosition), value, true);
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}
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#region public
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/// <summary>
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/// Converts TopPosition into DDL.
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/// </summary>
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public void Serialize(Serializer serializer)
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{
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if (_shapePosition == ShapePosition.Undefined)
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serializer.WriteSimpleAttribute("Top", Position);
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else
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serializer.WriteSimpleAttribute("Top", ShapePosition);
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}
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#endregion
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/// <summary>
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/// Represents the unitialized TopPosition object.
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/// </summary>
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public static readonly TopPosition NullValue = new TopPosition();
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}
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}
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