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| 1 // Copyright 2015 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.chrome.browser.toolbar; |
| 6 |
| 7 import android.view.KeyEvent; |
| 8 import android.view.View; |
| 9 import android.view.View.OnKeyListener; |
| 10 |
| 11 /** |
| 12 * This is an abstract class to override keyboard navigation behavior for views. |
| 13 */ |
| 14 abstract class KeyboardNavigationListener implements OnKeyListener { |
| 15 |
| 16 public KeyboardNavigationListener() { |
| 17 super(); |
| 18 } |
| 19 |
| 20 @Override |
| 21 public boolean onKey(View v, int keyCode, KeyEvent event) { |
| 22 if (keyCode == KeyEvent.KEYCODE_TAB && event.getAction() == KeyEvent.ACT
ION_DOWN) { |
| 23 if (event.hasNoModifiers()) { |
| 24 View forward = getNextFocusForward(); |
| 25 if (forward != null) return forward.requestFocus(); |
| 26 } else if (event.isShiftPressed()) { |
| 27 View backward = getNextFocusBackward(); |
| 28 if (backward != null) return backward.requestFocus(); |
| 29 } |
| 30 } else if (keyCode == KeyEvent.KEYCODE_ENTER && event.getAction() == Key
Event.ACTION_UP) { |
| 31 return handleEnterKeyPress(); |
| 32 } |
| 33 return false; |
| 34 } |
| 35 |
| 36 /** |
| 37 * Get the view to be focused on a TAB click. If you return null, the defaul
t key event |
| 38 * processing will occur instead of attempting to focus. |
| 39 * @return The view to gain focus. |
| 40 */ |
| 41 public View getNextFocusForward() { |
| 42 return null; |
| 43 } |
| 44 |
| 45 /** |
| 46 * Get the view to be focused on a Shift + TAB click. If you return null, th
e default key event |
| 47 * processing will occur instead of attempting to focus. |
| 48 * @return The view to gain focus. |
| 49 */ |
| 50 public View getNextFocusBackward() { |
| 51 return null; |
| 52 } |
| 53 |
| 54 /** |
| 55 * Allows the extending class to special case the enter key press handling. |
| 56 * @return Whether the enter key was handled |
| 57 */ |
| 58 protected boolean handleEnterKeyPress() { |
| 59 return false; |
| 60 } |
| 61 } |
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