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/*
Copyright 2011 WebDriver committers
Copyright 2011 Google Inc.

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.
 */

package org.openqa.selenium;

import org.openqa.selenium.interactions.internal.Coordinates;

/**
 * Interface representing basic touch screen operations.
 */
public interface TouchScreen {

  /**
   * Allows the execution of single tap on the screen, analogous to click using a Mouse.
   * 
   * @param where The location on the screen. Typically a {@link WebElement}
   */
  void singleTap(Coordinates where);

  /**
   * Allows the execution of the gesture 'down' on the screen. It is typically the first of a
   * sequence of touch gestures.
   * 
   * @param x The x coordinate relative to the viewport
   * @param y The y coordinate relative to the viewport
   */
  void down(int x, int y);

  /**
   * Allows the execution of the gesture 'up' on the screen. It is typically the last of a sequence
   * of touch gestures.
   * 
   * @param x The x coordinate relative to the viewport
   * @param y The y coordinate relative to the viewport
   */
  void up(int x, int y);

  /**
   * Allows the execution of the gesture 'move' on the screen.
   * 
   * @param x The x coordinate relative to the viewport
   * @param y The y coordinate relative to the viewport
   */
  void move(int x, int y);

  /**
   * Creates a scroll gesture that starts on a particular screen location.
   * 
   * @param where the location where the scroll starts, usually a {@link WebElement}.
   * @param xOffset The x offset to scroll
   * @param yOffset The y offset to scroll
   */
  void scroll(Coordinates where, int xOffset, int yOffset);

  /**
   * Allows the execution of double tapon the screen, analogous to double click using a Mouse.
   * 
   * @param where The coordinates of the element to double tap
   */
  void doubleTap(Coordinates where);

  /**
   * Allows the execution of long press gestures.
   * 
   * @param where The coordinate of the element to long press
   */
  void longPress(Coordinates where);

  /**
   * Allows the view to be scrolled by an x and y offset.
   * 
   * @param xOffset The horizontal offset relative to the viewport
   * @param yOffset The vertical offset relative to the viewport
   */
  void scroll(int xOffset, int yOffset);

  /**
   * Sends a flick gesture to the current view.
   * 
   * @param xSpeed The horizontal speed in pixels/second
   * @param ySpeed The vertical speed in pixels/second
   */
  void flick(int xSpeed, int ySpeed);

  /**
   * Allows the execution of flick gestures starting in a location's element.
   * 
   * @param where The coordinate of the element to flick on
   * @param xOffset The x offset relative to the viewport
   * @param yOffset The y offset relative to the viewport
   */
  void flick(Coordinates where, int xOffset, int yOffset, int speed);
}