Handle long press in PDF documents.

chrome/test/data/pdf/touch_handling_test.js

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+function sendTouchStart(touches) {
+  var id = 0;
+  let touch_list = touches.map(function(xy) {

[Kevin McNee, 2017/05/04 15:38:55]

nit: touchList

[dsinclair, 2017/05/04 17:55:54]

Done.

+    var touchInit = {
+      identifier: id++,
+      target: viewer.plugin_,
+      clientX: xy.x,
+      clientY: xy.y,
+    };
+
+    return new window.Touch(touchInit);
+  });
+
+ viewer.plugin_.dispatchEvent(new TouchEvent('touchstart', {
+      touches: touch_list,
+      targetTouches: touch_list,
+      changedtouches: touch_list}));

[Kevin McNee, 2017/05/04 15:38:55]

nit: formatting
https://google.github.io/styleguide/jsguide.html#formatting-object-literals

[dsinclair, 2017/05/04 17:55:54]

Done.

+}
+
+function createContextMenuEvent() {
+  return new MouseEvent('contextmenu', {
+      cancelable: true,

[Kevin McNee, 2017/05/04 15:38:55]

nit: formatting

[dsinclair, 2017/05/04 17:55:54]

Done.

+      sourceCapabilities: new InputDeviceCapabilities({firesTouchEvents: true})
+    });
+}
+
+var tests = [
+  // Test suppression of the context menu on single touch.
+  function testContextMenuSingleTouch() {
+    sendTouchStart([{x: 10, y: 10}]);
+
+    let event = createContextMenuEvent();
+    // Dispatch event will be false if the event is cancellable and one of the
+    // handlers called preventDefault.
+    chrome.test.assertFalse(document.dispatchEvent(event),
+          "Should have called preventDefault() for single touch.");

[Kevin McNee, 2017/05/04 15:38:55]

nit: formatting

[dsinclair, 2017/05/04 17:55:54]

Done.

+    chrome.test.succeed();
+  },
+
+  // Test allowing of context menu on double touch.
+  function testContextMenuDoubleTouch() {
+    sendTouchStart([{x: 10, y: 10}, {x: 15, y: 15}]);
+
+    let event = createContextMenuEvent();
+    chrome.test.assertTrue(document.dispatchEvent(event),
+          "Should not have called preventDefault() for double touch.");

[Kevin McNee, 2017/05/04 15:38:55]

nit: formatting

[dsinclair, 2017/05/04 17:55:54]

Done.

+    chrome.test.succeed();
+  },
+
+  // Test long press selects word.
+  function testLongPressSelectsText() {
+    var client = new PDFScriptingAPI(window, window);
+
+    sendTouchStart([{x: 336, y: 163}]);
+    window.setTimeout(function() {
+      client.getSelectedText(chrome.test.callbackPass(function(selectedText) {
+        chrome.test.assertEq('some', selectedText);
+      }));
+      chrome.test.succeed();
+    }, 350);
+  }
+];
+
+var scriptingAPI = new PDFScriptingAPI(window, window);
+scriptingAPI.setLoadCallback(function() {
+  chrome.test.runTests(tests);
+});