WPF自定义空心文字

来源:转载


首先创建一个自定义控件,继承自FrameworkElement,“Generic.xaml”中可以不添加样式。

要自定义空心文字,要用到绘制格式化文本FormattedText类。FormattedText对象提供的文本格式设置功能比WPF提供的已有文本控件提供的相应功能更为强大。调用FormattedText构造函数,可以传入相应的参数,得到我们想要的文本样式。使用 MaxTextWidth 属性可以将文本约束为特定宽度。 文本将自动换行,以避免超过指定宽度。 使用 MaxTextHeight 属性可以将文本约束为特定高度。 超过指定高度的文本将显示一个省略号“…”。

接下来重写OnRender方法,在方法体中调用DrawingContext对象的DrawGeometry方法即可完成文本的绘制工作。

 

 1 public class OutlinedText : FrameworkElement, IAddChild 2 { 3 /// <summary> 4 /// 静态构造函数 5 /// </summary> 6 static OutlinedText() 7 { 8 DefaultStyleKeyProperty.OverrideMetadata(typeof(OutlinedText), new FrameworkPropertyMetadata(typeof(OutlinedText))); 9 } 10 11 12 #region Private Fields 13 14 /// <summary> 15 /// 文字几何形状 16 /// </summary> 17 private Geometry m_TextGeometry; 18 19 #endregion 20 21 22 #region Private Methods 23 24 /// <summary> 25 /// 当依赖项属性改变文字无效时,创建新的空心文字对象来显示。 26 /// </summary> 27 /// <param name="d"></param> 28 /// <param name="e"></param> 29 private static void OnOutlineTextInvalidated(DependencyObject d, DependencyPropertyChangedEventArgs e) 30 { 31 if (Convert.ToString(e.NewValue) != Convert.ToString(e.OldValue)) 32 { 33 ((OutlinedText)d).CreateText(); 34 } 35 } 36 37 #endregion 38 39 40 #region FrameworkElement Overrides 41 42 /// <summary> 43 /// 重写绘制文字的方法。 44 /// </summary> 45 /// <param name="drawingContext">空心文字控件的绘制上下文。</param> 46 protected override void OnRender(DrawingContext drawingContext) 47 { 48 //CreateText(); 49 // 基于设置的属性绘制空心文字控件。 50 drawingContext.DrawGeometry(Fill, new Pen(Stroke, StrokeThickness), m_TextGeometry); 51 } 52 53 /// <summary> 54 /// 基于格式化文字创建文字的几何轮廓。 55 /// </summary> 56 public void CreateText() 57 { 58 FontStyle fontStyle = FontStyles.Normal; 59 FontWeight fontWeight = FontWeights.Medium; 60 if (Bold == true) 61 fontWeight = FontWeights.Bold; 62 if (Italic == true) 63 fontStyle = FontStyles.Italic; 64 // 基于设置的属性集创建格式化的文字。 65 FormattedText formattedText = new FormattedText( 66 Text, CultureInfo.GetCultureInfo("en-us"), FlowDirection.LeftToRight, 67 new Typeface(Font, fontStyle, fontWeight, FontStretches.Normal), 68 FontSize, Brushes.Black); 69 formattedText.MaxTextWidth = this.MaxTextWidth; 70 formattedText.MaxTextHeight = this.MaxTextHeight; 71 // 创建表示文字的几何对象。 72 m_TextGeometry = formattedText.BuildGeometry(new Point(0, 0)); 73 // 基于格式化文字的大小设置空心文字的大小。 74 this.MinWidth = formattedText.Width; 75 this.MinHeight = formattedText.Height; 76 } 77 78 #endregion 79 80 81 #region DependencyProperties 82 83 /// <summary> 84 /// 指定将文本约束为特定宽度 85 /// </summary> 86 public double MaxTextWidth 87 { 88 get { return (double)GetValue(MaxTextWidthProperty); } 89 set { SetValue(MaxTextWidthProperty, value); } 90 } 91 /// <summary> 92 /// 指定将文本约束为特定宽度依赖属性 93 /// </summary> 94 public static readonly DependencyProperty MaxTextWidthProperty = 95 DependencyProperty.Register("MaxTextWidth", typeof(double), typeof(OutlinedText), 96 new FrameworkPropertyMetadata(1000.0, FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null)); 97 98 /// <summary> 99 /// 指定将文本约束为特定高度100 /// </summary>101 public double MaxTextHeight102 {103 get { return (double)GetValue(MaxTextHeightProperty); }104 set { SetValue(MaxTextHeightProperty, value); }105 }106 /// <summary>107 /// 指定将文本约束为特定高度依赖属性108 /// </summary>109 public static readonly DependencyProperty MaxTextHeightProperty =110 DependencyProperty.Register("MaxTextHeight", typeof(double), typeof(OutlinedText),111 new FrameworkPropertyMetadata(1000.0, FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null));112 113 /// <summary> 114 /// 指定字体是否加粗。 115 /// </summary> 116 public bool Bold117 {118 get { return (bool)GetValue(BoldProperty); }119 set { SetValue(BoldProperty, value); }120 }121 /// <summary> 122 /// 指定字体是否加粗依赖属性。 123 /// </summary> 124 public static readonly DependencyProperty BoldProperty = DependencyProperty.Register(125 "Bold", typeof(bool), typeof(OutlinedText),126 new FrameworkPropertyMetadata(false, FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null));127 128 /// <summary> 129 /// 指定填充字体的画刷颜色。 130 /// </summary> 131 /// 132 public Brush Fill133 {134 get { return (Brush)GetValue(FillProperty); }135 set { SetValue(FillProperty, value); }136 }137 /// <summary> 138 /// 指定填充字体的画刷颜色依赖属性。 139 /// </summary> 140 public static readonly DependencyProperty FillProperty = DependencyProperty.Register(141 "Fill", typeof(Brush), typeof(OutlinedText),142 new FrameworkPropertyMetadata(new SolidColorBrush(Colors.LightSteelBlue), FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null));143 144 /// <summary> 145 /// 指定文字显示的字体。 146 /// </summary> 147 public FontFamily Font148 {149 get { return (FontFamily)GetValue(FontProperty); }150 set { SetValue(FontProperty, value); }151 }152 /// <summary> 153 /// 指定文字显示的字体依赖属性。 154 /// </summary> 155 public static readonly DependencyProperty FontProperty = DependencyProperty.Register(156 "Font", typeof(FontFamily), typeof(OutlinedText),157 new FrameworkPropertyMetadata(new FontFamily("Arial"), FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null));158 159 /// <summary> 160 /// 指定字体大小。161 /// </summary> 162 public double FontSize163 {164 get { return (double)GetValue(FontSizeProperty); }165 set { SetValue(FontSizeProperty, value); }166 }167 /// <summary> 168 /// 指定字体大小依赖属性。 169 /// </summary> 170 public static readonly DependencyProperty FontSizeProperty = DependencyProperty.Register(171 "FontSize", typeof(double), typeof(OutlinedText),172 new FrameworkPropertyMetadata((double)48.0, FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null));173 174 /// <summary> 175 /// 指定字体是否显示斜体字体样式。 176 /// </summary> 177 public bool Italic178 {179 get { return (bool)GetValue(ItalicProperty); }180 set { SetValue(ItalicProperty, value); }181 }182 /// <summary> 183 /// 指定字体是否显示斜体字体样式依赖属性。 184 /// </summary> 185 public static readonly DependencyProperty ItalicProperty = DependencyProperty.Register(186 "Italic", typeof(bool), typeof(OutlinedText),187 new FrameworkPropertyMetadata(false, FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null));188 189 /// <summary> 190 /// 指定绘制空心字体边框画刷的颜色。 191 /// </summary> 192 public Brush Stroke193 {194 get { return (Brush)GetValue(StrokeProperty); }195 set { SetValue(StrokeProperty, value); }196 }197 /// <summary> 198 /// 指定绘制空心字体边框画刷的颜色依赖属性。 199 /// </summary> 200 public static readonly DependencyProperty StrokeProperty = DependencyProperty.Register(201 "Stroke", typeof(Brush), typeof(OutlinedText),202 new FrameworkPropertyMetadata(new SolidColorBrush(Colors.Teal), FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null));203 204 /// <summary> 205 /// 指定空心字体边框大小。 206 /// </summary> 207 public ushort StrokeThickness208 {209 get { return (ushort)GetValue(StrokeThicknessProperty); }210 set { SetValue(StrokeThicknessProperty, value); }211 }212 /// <summary> 213 /// 指定空心字体边框大小依赖属性。 214 /// </summary> 215 public static readonly DependencyProperty StrokeThicknessProperty =216 DependencyProperty.Register("StrokeThickness",217 typeof(ushort), typeof(OutlinedText),218 new FrameworkPropertyMetadata((ushort)0, FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnOutlineTextInvalidated), null));219 220 /// <summary> 221 /// 指定要显示的文字字符串。 222 /// </summary> 223 public string Text224 {225 get { return (string)GetValue(TextProperty); }226 set { SetValue(TextProperty, value); }227 }228 /// <summary> 229 /// 指定要显示的文字字符串依赖属性。 230 /// </summary> 231 public static readonly DependencyProperty TextProperty = DependencyProperty.Register(232 "Text", typeof(string), typeof(OutlinedText),233 new FrameworkPropertyMetadata("",234 FrameworkPropertyMetadataOptions.AffectsRender,235 new PropertyChangedCallback(OnOutlineTextInvalidated),236 null));237 238 #endregion239 240 241 #region Public Methods242 243 /// <summary>244 /// 添加子对象。245 /// </summary>246 /// <param name="value">要添加的子对象。</param>247 public void AddChild(Object value)248 { }249 250 /// <summary>251 /// 将节点的文字内容添加到对象。252 /// </summary>253 /// <param name="value">要添加到对象的文字。</param>254 public void AddText(string value)255 {256 Text = value;257 }258 259 #endregion260 }

 

 



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