1 | using System;
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2 | using System.Xml;
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3 |
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4 | using SharpVectors.Dom.Css;
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5 |
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6 | namespace SharpVectors.Dom.Svg
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7 | {
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8 | public class SvgFitToViewBox
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9 | {
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10 | private ISvgAnimatedRect viewBox;
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11 | private ISvgAnimatedPreserveAspectRatio preserveAspectRatio;
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12 |
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13 | #region Protected Fields
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14 |
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15 | protected SvgElement ownerElement;
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16 |
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17 | #endregion
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18 |
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19 | public SvgFitToViewBox(SvgElement ownerElement)
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20 | {
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21 | this.ownerElement = ownerElement;
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22 | this.ownerElement.attributeChangeHandler += new NodeChangeHandler(AttributeChange);
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23 | }
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24 |
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25 | #region Update handling
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26 |
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27 | private void AttributeChange(Object src, XmlNodeChangedEventArgs args)
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28 | {
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29 | XmlAttribute attribute = src as XmlAttribute;
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30 |
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31 | if(attribute.NamespaceURI.Length == 0)
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32 | {
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33 | switch(attribute.LocalName)
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34 | {
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35 | case "viewBox":
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36 | viewBox = null;
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37 | break;
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38 | case "preserveAspectRatio":
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39 | preserveAspectRatio = null;
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40 | break;
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41 | }
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42 | }
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43 | }
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44 |
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45 | #endregion
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46 |
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47 | public ISvgAnimatedRect ViewBox
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48 | {
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49 | get
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50 | {
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51 | if (viewBox == null)
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52 | {
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53 | string attr = ownerElement.GetAttribute("viewBox").Trim();
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54 | if (String.IsNullOrEmpty(attr))
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55 | {
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56 | double x = 0;
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57 | double y = 0;
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58 | double width = 0;
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59 | double height = 0;
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60 | if (ownerElement is SvgSvgElement)
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61 | {
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62 | SvgSvgElement svgSvgElm = ownerElement as SvgSvgElement;
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63 |
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64 | x = svgSvgElm.X.AnimVal.Value;
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65 | y = svgSvgElm.Y.AnimVal.Value;
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66 | width = svgSvgElm.Width.AnimVal.Value;
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67 | height = svgSvgElm.Height.AnimVal.Value;
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68 | }
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69 | viewBox = new SvgAnimatedRect(new SvgRect(x, y, width, height));
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70 | }
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71 | else
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72 | {
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73 | viewBox = new SvgAnimatedRect(attr);
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74 | }
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75 | }
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76 |
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77 | return viewBox;
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78 | }
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79 | }
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80 |
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81 | public ISvgAnimatedPreserveAspectRatio PreserveAspectRatio
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82 | {
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83 | get
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84 | {
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85 | if (preserveAspectRatio == null)
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86 | {
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87 | preserveAspectRatio = new SvgAnimatedPreserveAspectRatio(
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88 | ownerElement.GetAttribute("preserveAspectRatio"), ownerElement);
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89 | }
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90 | return preserveAspectRatio;
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91 | }
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92 | }
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93 | }
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94 | }
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