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author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
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committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
commit | 33058f2b292b3a581333bdfb21b8f671898c5060 (patch) | |
tree | 51c3e392513ec574331b2d3f85c394445ea803c6 /files/ja/web/api/canvasrenderingcontext2d/drawfocusifneeded | |
parent | 8b66d724f7caf0157093fb09cfec8fbd0c6ad50a (diff) | |
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diff --git a/files/ja/web/api/canvasrenderingcontext2d/drawfocusifneeded/index.html b/files/ja/web/api/canvasrenderingcontext2d/drawfocusifneeded/index.html new file mode 100644 index 0000000000..4d0135e6fa --- /dev/null +++ b/files/ja/web/api/canvasrenderingcontext2d/drawfocusifneeded/index.html @@ -0,0 +1,196 @@ +--- +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"><canvas id="canvas"> + <input id="button" type="range" min="1" max="12"> +</canvas> +</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"><canvas id="canvas" width="400" height="200" class="playable-canvas"> +<input id="button" type="range" min="1" max="12"> +</canvas> +<div class="playable-buttons"> + <input id="edit" type="button" value="Edit" /> + <input id="reset" type="button" value="Reset" /> +</div> +<textarea id="code" class="playable-code"> +button.focus(); +ctx.beginPath(); +ctx.rect(10, 10, 30, 30); +ctx.drawFocusIfNeeded(button);</textarea> +</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> |