[DevTools] Split InputModel out of screencast

third_party/WebKit/Source/devtools/front_end/screencast/InputModel.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.
+
+Screencast.InputModel = class extends SDK.SDKModel {
+  /**
+   * @param {!SDK.Target} target
+   */
+  constructor(target) {
+    super(target);
+    this._inputAgent = target.inputAgent();
+    /** @type {?number} */
+    this._activeTouchOffsetTop = null;
+    this._activeTouchParams = null;
+  }
+
+  /**
+   * @param {!Event} event
+   */
+  emitKeyEvent(event) {
+    var type;
+    switch (event.type) {
+      case 'keydown':
+        type = 'keyDown';
+        break;
+      case 'keyup':
+        type = 'keyUp';
+        break;
+      case 'keypress':
+        type = 'char';
+        break;
+      default:
+        return;
+    }
+
+    var text = event.type === 'keypress' ? String.fromCharCode(event.charCode) : undefined;
+    this._inputAgent.invoke_dispatchKeyEvent({
+      type: type,
+      modifiers: this._modifiersForEvent(event),
+      timestamp: event.timeStamp / 1000,
+      text: text,
+      unmodifiedText: text ? text.toLowerCase() : undefined,
+      keyIdentifier: event.keyIdentifier,
+      code: event.code,
+      key: event.key,
+      windowsVirtualKeyCode: event.keyCode,
+      nativeVirtualKeyCode: event.keyCode,
+      autoRepeat: false,
+      isKeypad: false,
+      isSystemKey: false
+    });
+  }
+
+  /**
+   * @param {!Event} event
+   * @param {number} offsetTop
+   * @param {number} zoom
+   */
+  emitTouchFromMouseEvent(event, offsetTop, zoom) {
+    var buttons = {0: 'none', 1: 'left', 2: 'middle', 3: 'right'};
+    var types = {
+      'mousedown': 'mousePressed',
+      'mouseup': 'mouseReleased',
+      'mousemove': 'mouseMoved',
+      'mousewheel': 'mouseWheel'
+    };
+    if (!(event.type in types) || !(event.which in buttons))
+      return;
+    if (event.type !== 'mousewheel' && buttons[event.which] === 'none')
+      return;
+
+    if (event.type === 'mousedown' || this._activeTouchOffsetTop === null)
+      this._activeTouchOffsetTop = offsetTop;
+
+    var x = Math.round(event.offsetX / zoom);
+    var y = Math.round(event.offsetY / zoom);
+    y = Math.round(y - this._activeTouchOffsetTop);
+    var params = {
+      type: types[event.type],
+      x: x,
+      y: y,
+      modifiers: this._modifiersForEvent(event),
+      timestamp: event.timeStamp / 1000,
+      button: buttons[event.which],
+      clickCount: 0
+    };
+    if (event.type === 'mousewheel') {
+      params.deltaX = event.wheelDeltaX / zoom;
+      params.deltaY = event.wheelDeltaY / zoom;
+    } else {
+      this._activeTouchParams = params;
+    }
+    if (event.type === 'mouseup')
+      this._activeTouchOffsetTop = null;
+    this._inputAgent.invoke_emulateTouchFromMouseEvent(params);
+  }
+
+  cancelTouch() {
+    if (this._activeTouchOffsetTop !== null) {
+      var params = this._activeTouchParams;
+      this._activeTouchParams = null;
+      params.type = 'mouseReleased';
+      this._inputAgent.invoke_emulateTouchFromMouseEvent(params);
+    }
+  }
+
+  /**
+   * @param {!Event} event
+   * @return {number}
+   */
+  _modifiersForEvent(event) {
+    return (event.altKey ? 1 : 0) | (event.ctrlKey ? 2 : 0) | (event.metaKey ? 4 : 0) | (event.shiftKey ? 8 : 0);
+  }
+};
+
+SDK.SDKModel.register(Screencast.InputModel, SDK.Target.Capability.Input, false);