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debugFillProperties.html 11KB

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  24. <li class="self-crumb">debugFillProperties method</li>
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  26. <div class="self-name">debugFillProperties</div>
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  38. <a href="pages_SideBarContent/SideBarContentState-class.html#instance-properties">Properties</a>
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  63. <div class="col-xs-12 col-sm-9 col-md-8 main-content">
  64. <h1>debugFillProperties method</h1>
  65. <section class="multi-line-signature">
  66. <div>
  67. <ol class="annotation-list">
  68. <li>@override</li>
  69. </ol>
  70. </div>
  71. <span class="returntype">void</span>
  72. <span class="name ">debugFillProperties</span>
  73. (<wbr><span class="parameter" id="debugFillProperties-param-properties"><span class="type-annotation">DiagnosticPropertiesBuilder</span> <span class="parameter-name">properties</span></span>)
  74. <div class="features">inherited</div>
  75. </section>
  76. <section class="desc markdown">
  77. <p>Add additional properties associated with the node.</p>
  78. <p>Use the most specific <code>DiagnosticsProperty</code> existing subclass to describe
  79. each property instead of the <code>DiagnosticsProperty</code> base class. There are
  80. only a small number of <code>DiagnosticsProperty</code> subclasses each covering a
  81. common use case. Consider what values a property is relevant for users
  82. debugging as users debugging large trees are overloaded with information.
  83. Common named parameters in <code>DiagnosticsNode</code> subclasses help filter when
  84. and how properties are displayed.</p>
  85. <p><code>defaultValue</code>, <code>showName</code>, <code>showSeparator</code>, and <code>level</code> keep string
  86. representations of diagnostics terse and hide properties when they are not
  87. very useful.</p><ul><li>Use <code>defaultValue</code> any time the default value of a property is
  88. uninteresting. For example, specify a default value of null any time
  89. a property being null does not indicate an error.</li><li>Avoid specifying the <code>level</code> parameter unless the result you want
  90. cannot be achieved by using the <code>defaultValue</code> parameter or using
  91. the <code>ObjectFlagProperty</code> class to conditionally display the property
  92. as a flag.</li><li>Specify <code>showName</code> and <code>showSeparator</code> in rare cases where the string
  93. output would look clumsy if they were not set.
  94. <pre class="language-dart"><code class="language-dart">DiagnosticsProperty&lt;Object&gt;('child(3, 4)', null, ifNull: 'is null', showSeparator: false).toString()
  95. </code></pre>Shows using <code>showSeparator</code> to get output <code>child(3, 4) is null</code> which
  96. is more polished than <code>child(3, 4): is null</code>.
  97. <pre class="language-dart"><code class="language-dart">DiagnosticsProperty&lt;IconData&gt;('icon', icon, ifNull: '&lt;empty&gt;', showName: false)).toString()
  98. </code></pre>Shows using <code>showName</code> to omit the property name as in this context the
  99. property name does not add useful information.</li></ul>
  100. <p><code>ifNull</code>, <code>ifEmpty</code>, <code>unit</code>, and <code>tooltip</code> make property
  101. descriptions clearer. The examples in the code sample below illustrate
  102. good uses of all of these parameters.</p>
  103. <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>
  104. value in quotes.</li><li><code>DoubleProperty</code>, which supports specifying a unit of measurement for
  105. a <code>double</code> value.</li><li><code>PercentProperty</code>, which clamps a <code>double</code> to between 0 and 1 and
  106. formats it as a percentage.</li><li><code>IntProperty</code>, which supports specifying a unit of measurement for an
  107. <code>int</code> value.</li><li><code>FlagProperty</code>, which formats a <code>bool</code> value as one or more flags.
  108. Depending on the use case it is better to format a bool as
  109. <code>DiagnosticsProperty&lt;bool&gt;</code> instead of using <code>FlagProperty</code> as the
  110. output is more verbose but unambiguous.</li></ul>
  111. <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
  112. working around limitations of the <code>toString</code> implementation for Dart
  113. enum types.</li><li><code>IterableProperty</code>, which handles iterable values with display
  114. customizable depending on the <code>DiagnosticsTreeStyle</code> used.</li><li><code>ObjectFlagProperty</code>, which provides terse descriptions of whether a
  115. property value is present or not. For example, whether an <code>onClick</code>
  116. callback is specified or an animation is in progress.</li></ul>
  117. <p>If none of these subclasses apply, use the <code>DiagnosticsProperty</code>
  118. constructor or in rare cases create your own <code>DiagnosticsProperty</code>
  119. subclass as in the case for <code>TransformProperty</code> which handles <code>Matrix4</code>
  120. that represent transforms. Generally any property value with a good
  121. <code>toString</code> method implementation works fine using <code>DiagnosticsProperty</code>
  122. directly.</p>
  123. <p>Used by <a href="pages_SideBarContent/SideBarContentState/toDiagnosticsNode.html">toDiagnosticsNode</a> and <code>toString</code>.</p>
  124. </section>
  125. <section class="summary source-code" id="source">
  126. <h2><span>Implementation</span> </h2>
  127. <pre class="language-dart"><code class="language-dart">@override
  128. void debugFillProperties(DiagnosticPropertiesBuilder properties) {
  129. super.debugFillProperties(properties);
  130. assert(() {
  131. properties.add(EnumProperty&lt;_StateLifecycle&gt;(&#39;lifecycle state&#39;, _debugLifecycleState, defaultValue: _StateLifecycle.ready));
  132. return true;
  133. }());
  134. properties.add(ObjectFlagProperty&lt;T&gt;(&#39;_widget&#39;, _widget, ifNull: &#39;no widget&#39;));
  135. properties.add(ObjectFlagProperty&lt;StatefulElement&gt;(&#39;_element&#39;, _element, ifNull: &#39;not mounted&#39;));
  136. }</code></pre>
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