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debugFillProperties.html 9.5KB

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  59. <h1>debugFillProperties method</h1>
  60. <section class="multi-line-signature">
  61. <div>
  62. <ol class="annotation-list">
  63. <li>@override</li>
  64. </ol>
  65. </div>
  66. <span class="returntype">void</span>
  67. <span class="name ">debugFillProperties</span>
  68. (<wbr><span class="parameter" id="debugFillProperties-param-properties"><span class="type-annotation">DiagnosticPropertiesBuilder</span> <span class="parameter-name">properties</span></span>)
  69. <div class="features">inherited</div>
  70. </section>
  71. <section class="desc markdown">
  72. <p>Add additional properties associated with the node.</p>
  73. <p>Use the most specific <code>DiagnosticsProperty</code> existing subclass to describe
  74. each property instead of the <code>DiagnosticsProperty</code> base class. There are
  75. only a small number of <code>DiagnosticsProperty</code> subclasses each covering a
  76. common use case. Consider what values a property is relevant for users
  77. debugging as users debugging large trees are overloaded with information.
  78. Common named parameters in <code>DiagnosticsNode</code> subclasses help filter when
  79. and how properties are displayed.</p>
  80. <p><code>defaultValue</code>, <code>showName</code>, <code>showSeparator</code>, and <code>level</code> keep string
  81. representations of diagnostics terse and hide properties when they are not
  82. very useful.</p><ul><li>Use <code>defaultValue</code> any time the default value of a property is
  83. uninteresting. For example, specify a default value of null any time
  84. a property being null does not indicate an error.</li><li>Avoid specifying the <code>level</code> parameter unless the result you want
  85. cannot be achieved by using the <code>defaultValue</code> parameter or using
  86. the <code>ObjectFlagProperty</code> class to conditionally display the property
  87. as a flag.</li><li>Specify <code>showName</code> and <code>showSeparator</code> in rare cases where the string
  88. output would look clumsy if they were not set.
  89. <pre class="language-dart"><code class="language-dart">DiagnosticsProperty&lt;Object&gt;('child(3, 4)', null, ifNull: 'is null', showSeparator: false).toString()
  90. </code></pre>Shows using <code>showSeparator</code> to get output <code>child(3, 4) is null</code> which
  91. is more polished than <code>child(3, 4): is null</code>.
  92. <pre class="language-dart"><code class="language-dart">DiagnosticsProperty&lt;IconData&gt;('icon', icon, ifNull: '&lt;empty&gt;', showName: false)).toString()
  93. </code></pre>Shows using <code>showName</code> to omit the property name as in this context the
  94. property name does not add useful information.</li></ul>
  95. <p><code>ifNull</code>, <code>ifEmpty</code>, <code>unit</code>, and <code>tooltip</code> make property
  96. descriptions clearer. The examples in the code sample below illustrate
  97. good uses of all of these parameters.</p>
  98. <h2 id="diagnosticsproperty-subclasses-for-primitive-types">DiagnosticsProperty subclasses for primitive types</h2><ul><li><code>StringProperty</code>, which supports automatically enclosing a <code>String</code>
  99. value in quotes.</li><li><code>DoubleProperty</code>, which supports specifying a unit of measurement for
  100. a <code>double</code> value.</li><li><code>PercentProperty</code>, which clamps a <code>double</code> to between 0 and 1 and
  101. formats it as a percentage.</li><li><code>IntProperty</code>, which supports specifying a unit of measurement for an
  102. <code>int</code> value.</li><li><code>FlagProperty</code>, which formats a <code>bool</code> value as one or more flags.
  103. Depending on the use case it is better to format a bool as
  104. <code>DiagnosticsProperty&lt;bool&gt;</code> instead of using <code>FlagProperty</code> as the
  105. output is more verbose but unambiguous.</li></ul>
  106. <h2 id="other-important-diagnosticsproperty-variants">Other important <code>DiagnosticsProperty</code> variants</h2><ul><li><code>EnumProperty</code>, which provides terse descriptions of enum values
  107. working around limitations of the <code>toString</code> implementation for Dart
  108. enum types.</li><li><code>IterableProperty</code>, which handles iterable values with display
  109. customizable depending on the <code>DiagnosticsTreeStyle</code> used.</li><li><code>ObjectFlagProperty</code>, which provides terse descriptions of whether a
  110. property value is present or not. For example, whether an <code>onClick</code>
  111. callback is specified or an animation is in progress.</li></ul>
  112. <p>If none of these subclasses apply, use the <code>DiagnosticsProperty</code>
  113. constructor or in rare cases create your own <code>DiagnosticsProperty</code>
  114. subclass as in the case for <code>TransformProperty</code> which handles <code>Matrix4</code>
  115. that represent transforms. Generally any property value with a good
  116. <code>toString</code> method implementation works fine using <code>DiagnosticsProperty</code>
  117. directly.</p>
  118. <p>Used by <a href="pages_SideBarContent/SideBarContentState/toDiagnosticsNode.html">toDiagnosticsNode</a> and <code>toString</code>.</p>
  119. </section>
  120. <section class="summary source-code" id="source">
  121. <h2><span>Implementation</span> </h2>
  122. <pre class="language-dart"><code class="language-dart">@override
  123. void debugFillProperties(DiagnosticPropertiesBuilder properties) {
  124. super.debugFillProperties(properties);
  125. properties.defaultDiagnosticsTreeStyle = DiagnosticsTreeStyle.dense;
  126. }</code></pre>
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