From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:40:17 -0500 Subject: initial commit --- .../drawfocusifneeded/index.html | 196 +++++++++++++++++++++ 1 file changed, 196 insertions(+) create mode 100644 files/ja/web/api/canvasrenderingcontext2d/drawfocusifneeded/index.html (limited to 'files/ja/web/api/canvasrenderingcontext2d/drawfocusifneeded') 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 +--- +
{{APIRef}}
+ +

Canvas 2D APIのCanvasRenderingContext2D.drawFocusIfNeeded()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。

+ +

構文

+ +
void ctx.drawFocusIfNeeded(element);
+void ctx.drawFocusIfNeeded(path, element);
+
+ +

パラメーター

+ +
+
element
+
フォーカスしたかどうかをチェックする要素。
+
path
+
利用する {{domxref("Path2D")}} パス。
+
+ +

例

+ +

drawFocusIfNeededメソッドを使う

+ +

これは、drawFocusIfNeededメソッドを使った簡単なコードです

+ +

HTML

+ +
<canvas id="canvas">
+  <input id="button" type="range" min="1" max="12">
+</canvas>
+
+ +

JavaScript

+ +
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);
+
+ +

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:

+ +
+
Playable code
+ +
<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>
+
+ +
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);
+
+
+ +

{{EmbedLiveSample('Playable_code', 700, 360)}}

+ +

仕様

+ + + + + + + + + + + + + + +
仕様策定状況コメント
{{SpecName('HTML WHATWG', "scripting.html#dom-context-2d-drawfocusifneeded", "CanvasRenderingContext2D.drawFocusIfNeeded")}}{{Spec2('HTML WHATWG')}}
+ +

ブラウザー実装状況

+ +

{{CompatibilityTable}}

+ +
+ + + + + + + + + + + + + + + + + + + + + + + + + + + +
機能ChromeFirefox (Gecko)Internet ExplorerOperaSafari
基本サポート{{CompatVersionUnknown}}{{CompatGeckoDesktop(29)}}[1]{{CompatNo}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}
Pathパラメーター{{CompatVersionUnknown}}{{CompatNo}}{{CompatNo}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}
+
+ +
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
機能AndroidChrome for AndroidFirefox Mobile (Gecko)IE MobileOpera MobileSafari Mobile
基本サポート{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatGeckoMobile(29)}}[1]{{CompatNo}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}
Pathパラメーター{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatNo}}{{CompatNo}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}
+
+ +

注記

+ + + +

関連情報

+ + -- cgit v1.2.3-54-g00ecf