1 | using System;
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2 | using System.ComponentModel;
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3 | namespace Netron.Diagramming.Core {
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4 | /// <summary>
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5 | /// Type descriptor provider for all descendants of the <see cref="ShapeBase"/> classes.
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6 | /// </summary>
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7 | class ShapeProvider : TypeDescriptionProvider {
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8 | #region Fields
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9 |
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10 | /// <summary>
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11 | /// simple shape descriptor
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12 | /// </summary>
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13 | private static SimpleShapeBaseDescriptor simpleShapeBaseDescriptor;
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14 | /// <summary>
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15 | /// complex shape descriptor
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16 | /// </summary>
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17 | private static ComplexShapeBaseDescriptor complexShapeBaseDescriptor;
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18 |
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19 |
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20 | private static ClassShapeDescriptor classShapeDescriptor;
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21 |
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22 | #endregion
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23 |
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24 | #region Properties
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25 |
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26 |
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27 | #endregion
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28 |
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29 | #region Constructor
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30 | public ShapeProvider() {
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31 | simpleShapeBaseDescriptor = new SimpleShapeBaseDescriptor(this, typeof(SimpleShapeBase));
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32 | complexShapeBaseDescriptor = new ComplexShapeBaseDescriptor(this, typeof(ComplexShapeBase));
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33 | classShapeDescriptor = new ClassShapeDescriptor(this, typeof(ClassShape));
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34 | }
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35 | #endregion
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36 |
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37 | #region Methods
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38 | /// <summary>
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39 | /// Gets a custom type descriptor for the given type and object.
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40 | /// </summary>
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41 | /// <param name="objectType">The type of object for which to retrieve the type descriptor.</param>
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42 | /// <param name="instance">An instance of the type. Can be null if no instance was passed to the <see cref="T:System.ComponentModel.TypeDescriptor"></see>.</param>
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43 | /// <returns>
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44 | /// An <see cref="T:System.ComponentModel.ICustomTypeDescriptor"></see> that can provide metadata for the type.
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45 | /// </returns>
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46 | public override ICustomTypeDescriptor GetTypeDescriptor(Type objectType, object instance) {
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47 | if (typeof(SimpleShapeBase).IsInstanceOfType(instance)) {
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48 | return simpleShapeBaseDescriptor;
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49 | } else if (typeof(ClassShape).IsInstanceOfType(instance)) {
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50 | return classShapeDescriptor;
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51 | } else if (typeof(ComplexShapeBase).IsInstanceOfType(instance)) {
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52 | return complexShapeBaseDescriptor;
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53 | } else //if nothing found use the base descriptor
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54 | return base.GetTypeDescriptor(objectType, instance);
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55 |
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56 | }
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57 | #endregion
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58 |
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59 | }
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60 | }
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61 |
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