fork from https://github.com/mozilla/pdf.js.git

web/renderable_view.js

@@ -0,0 +1,71 @@
+/* Copyright 2018 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const RenderingStates = {
+  INITIAL: 0,
+  RUNNING: 1,
+  PAUSED: 2,
+  FINISHED: 3,
+};
+
+class RenderableView {
+  /**
+   * Unique ID for rendering queue.
+   * @type {string}
+   */
+  renderingId = "";
+
+  /**
+   * @type {import("../src/display/api").RenderTask | null}
+   */
+  renderTask = null;
+
+  /**
+   * @type {function | null}
+   */
+  resume = null;
+
+  constructor() {
+    if (
+      (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) &&
+      this.constructor === RenderableView
+    ) {
+      throw new Error("Cannot initialize RenderableView.");
+    }
+  }
+
+  /**
+   * @type {number}
+   */
+  get renderingState() {
+    throw new Error("Abstract getter `renderingState` accessed");
+  }
+
+  /**
+   * @param {number} state
+   */
+  set renderingState(state) {
+    throw new Error("Abstract setter `renderingState` accessed");
+  }
+
+  /**
+   * @returns {Promise} Resolved on draw completion.
+   */
+  async draw() {
+    throw new Error("Not implemented: draw");
+  }
+}
+
+export { RenderableView, RenderingStates };