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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: CanvasRenderingContext2D.drawFocusIfNeeded()
+slug: Web/API/CanvasRenderingContext2D/drawFocusIfNeeded
+translation_of: Web/API/CanvasRenderingContext2D/drawFocusIfNeeded
+---
+<div>{{APIRef}}</div>
+
+<p>Canvas 2D APIの<code><strong>CanvasRenderingContext2D</strong></code><strong><code>.drawFocusIfNeeded()</code></strong>メソッドは、パラメーターで与えられた要素がフォーカスした時に、現在のパスもしくは与えられたパスの周りにフォーカスリングを描画します。</p>
+
+<h2 id="構文">構文</h2>
+
+<pre class="syntaxbox">void <var><em>ctx</em>.drawFocusIfNeeded(element);<var>
+void <var><em>ctx</em>.drawFocusIfNeeded(path, element);</var></var></var>
+</pre>
+
+<h3 id="パラメーター">パラメーター</h3>
+
+<dl>
+ <dt>element</dt>
+ <dd>フォーカスしたかどうかをチェックする要素。</dd>
+ <dt><code>path</code></dt>
+ <dd>利用する {{domxref("Path2D")}} パス。</dd>
+</dl>
+
+<h2 id="例">例</h2>
+
+<h3 id="drawFocusIfNeededメソッドを使う"><code>drawFocusIfNeeded</code>メソッドを使う</h3>
+
+<p>これは、<code>drawFocusIfNeeded</code>メソッドを使った簡単なコードです</p>
+
+<h4 id="HTML">HTML</h4>
+
+<pre class="brush: html">&lt;canvas id="canvas"&gt;
+ &lt;input id="button" type="range" min="1" max="12"&gt;
+&lt;/canvas&gt;
+</pre>
+
+<h4 id="JavaScript">JavaScript</h4>
+
+<pre class="brush: js; highlight:[9]">var canvas = document.getElementById("canvas");
+var ctx = canvas.getContext("2d");
+var button = document.getElementById("button");
+
+button.focus();
+
+ctx.beginPath();
+ctx.rect(10, 10, 30, 30);
+ctx.drawFocusIfNeeded(button);
+</pre>
+
+<p>下のコードを編集すると、変更がリアルタイムにcanvasに反映されます:</p>
+
+<div style="display: none;">
+<h6 id="Playable_code">Playable code</h6>
+
+<pre class="brush: html">&lt;canvas id="canvas" width="400" height="200" class="playable-canvas"&gt;
+&lt;input id="button" type="range" min="1" max="12"&gt;
+&lt;/canvas&gt;
+&lt;div class="playable-buttons"&gt;
+ &lt;input id="edit" type="button" value="Edit" /&gt;
+ &lt;input id="reset" type="button" value="Reset" /&gt;
+&lt;/div&gt;
+&lt;textarea id="code" class="playable-code"&gt;
+button.focus();
+ctx.beginPath();
+ctx.rect(10, 10, 30, 30);
+ctx.drawFocusIfNeeded(button);&lt;/textarea&gt;
+</pre>
+
+<pre class="brush: js">var canvas = document.getElementById("canvas");
+var ctx = canvas.getContext("2d");
+var textarea = document.getElementById("code");
+var button = document.getElementById("button");
+var reset = document.getElementById("reset");
+var edit = document.getElementById("edit");
+var code = textarea.value;
+
+function drawCanvas() {
+ ctx.clearRect(0, 0, canvas.width, canvas.height);
+ eval(textarea.value);
+}
+
+reset.addEventListener("click", function() {
+ textarea.value = code;
+ drawCanvas();
+});
+
+edit.addEventListener("click", function() {
+ textarea.focus();
+})
+
+textarea.addEventListener("input", drawCanvas);
+window.addEventListener("load", drawCanvas);
+</pre>
+</div>
+
+<p>{{EmbedLiveSample('Playable_code', 700, 360)}}</p>
+
+<h2 id="仕様">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">仕様</th>
+ <th scope="col">策定状況</th>
+ <th scope="col">コメント</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('HTML WHATWG', "scripting.html#dom-context-2d-drawfocusifneeded", "CanvasRenderingContext2D.drawFocusIfNeeded")}}</td>
+ <td>{{Spec2('HTML WHATWG')}}</td>
+ <td></td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="ブラウザー実装状況">ブラウザー実装状況</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>機能</th>
+ <th>Chrome</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari</th>
+ </tr>
+ <tr>
+ <td>基本サポート</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatGeckoDesktop(29)}}[1]</td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ </tr>
+ <tr>
+ <td>Pathパラメーター</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>機能</th>
+ <th>Android</th>
+ <th>Chrome for Android</th>
+ <th>Firefox Mobile (Gecko)</th>
+ <th>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ </tr>
+ <tr>
+ <td>基本サポート</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatGeckoMobile(29)}}[1]</td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ </tr>
+ <tr>
+ <td>Pathパラメーター</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<h3 id="注記">注記</h3>
+
+<ul>
+ <li>[1] Gecko 28 {{geckoRelease(28)}}ではこのメソッドは "<code>drawSystemFocusRing</code>" として実装されていましたが、Gecko 29 {{geckoRelease(29)}} で名前が変更されました。</li>
+ <li>[1] Gecko 32 {{geckoRelease(32)}} より前では、このメソッドは設定を変更しないと有効にならず、有効にするには "<code>canvas.focusring.enabled</code>" を変更する必要がありました。</li>
+</ul>
+
+<h2 id="関連情報">関連情報</h2>
+
+<ul>
+ <li>{{domxref("CanvasRenderingContext2D")}} インタフェースがこのメソッドを定義しています。</li>
+</ul>