1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 package org.chromium.chromoting; 6 7 import android.view.MotionEvent; 8 9 /** 10 * This interface allows multiple styles of touchscreen UI to be implemented and dynamically 11 * switched. The DesktopView passes the low-level touchscreen events and other events via this 12 * interface. The implementation recognizes and processes the touchscreen gestures, and then 13 * performs actions on the DesktopView (such as panning/zooming the display, injecting input, or 14 * showing/hiding UI elements). All methods are called on the main UI thread. 15 */ 16 public interface TouchInputHandler { 17 // These constants must match those in the generated struct protoc::MouseEvent_MouseButton. 18 int BUTTON_UNDEFINED = 0; 19 int BUTTON_LEFT = 1; 20 int BUTTON_MIDDLE = 2; 21 int BUTTON_RIGHT = 3; 22 23 /** 24 * Processes a touch event. This should be called by the View in its onTouchEvent() handler. 25 */ 26 boolean onTouchEvent(MotionEvent event); 27 28 /** 29 * Called when the screen configuration is changed, such as when the screen is rotated or an 30 * external display is plugged in. This is not called if the client display area changes as a 31 * result of showing/hiding UI elements such as a keyboard. For example, an implementation 32 * could set a flag to reset the zoom level when the screen is rotated, but not when the 33 * software keyboard appears. After this is called, the onClientSizeChanged() method will 34 * shortly be called with the dimensions of the new client display area. 35 */ 36 void onScreenConfigurationChanged(); 37 38 /** 39 * Called whenever the client display area changes size. The caller will handle repainting 40 * after this method returns. 41 */ 42 void onClientSizeChanged(int width, int height); 43 44 /** 45 * Called when the host screen size is changed. The caller will handle repainting after this 46 * method returns. 47 */ 48 void onHostSizeChanged(int width, int height); 49 50 /** 51 * Whilst an animation is in progress, this method is called repeatedly until the animation is 52 * cancelled. After this method returns, the DesktopView will schedule a repaint. 53 */ 54 void processAnimation(); 55 } 56
