ContentViewClient.java revision 558790d6acca3451cf3a6b497803a5f07d0bec58
1// Copyright (c) 2012 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 5package org.chromium.content.browser; 6 7import android.content.ActivityNotFoundException; 8import android.content.Context; 9import android.content.Intent; 10import android.graphics.RectF; 11import android.util.Log; 12import android.view.ActionMode; 13import android.view.KeyEvent; 14 15import org.chromium.content.browser.SelectActionModeCallback.ActionHandler; 16 17import java.net.URISyntaxException; 18 19/** 20 * Main callback class used by ContentView. 21 * 22 * This contains the superset of callbacks required to implement the browser UI and the callbacks 23 * required to implement the WebView API. 24 * The memory and reference ownership of this class is unusual - see the .cc file and ContentView 25 * for more details. 26 * 27 * TODO(mkosiba): Rid this guy of default implementations. This class is used by both WebView and 28 * the browser and we don't want a the browser-specific default implementation to accidentally leak 29 * over to WebView. 30 */ 31public class ContentViewClient { 32 // Tag used for logging. 33 private static final String TAG = "ContentViewClient"; 34 35 public void onUpdateTitle(String title) { 36 } 37 38 /** 39 * Called whenever the background color of the page changes as notified by WebKit. 40 * @param color The new ARGB color of the page background. 41 */ 42 public void onBackgroundColorChanged(int color) { 43 } 44 45 /** 46 * Lets client listen on the scaling changes on delayed, throttled 47 * and best-effort basis. Used for WebView.onScaleChanged. 48 */ 49 public void onScaleChanged(float oldScale, float newScale) { 50 } 51 52 /** 53 * Notifies the client that the position of the top controls has changed. 54 * @param topControlsOffsetYPix The Y offset of the top controls in physical pixels. 55 * @param contentOffsetYPix The Y offset of the content in physical pixels. 56 * @param overdrawBottomHeightPix The overdraw height. 57 */ 58 public void onOffsetsForFullscreenChanged( 59 float topControlsOffsetYPix, float contentOffsetYPix, float overdrawBottomHeightPix) { 60 } 61 62 public void onTabCrash() { 63 } 64 65 public boolean shouldOverrideKeyEvent(KeyEvent event) { 66 int keyCode = event.getKeyCode(); 67 // We need to send almost every key to WebKit. However: 68 // 1. We don't want to block the device on the renderer for 69 // some keys like menu, home, call. 70 // 2. There are no WebKit equivalents for some of these keys 71 // (see app/keyboard_codes_win.h) 72 // Note that these are not the same set as KeyEvent.isSystemKey: 73 // for instance, AKEYCODE_MEDIA_* will be dispatched to webkit. 74 if (keyCode == KeyEvent.KEYCODE_MENU || 75 keyCode == KeyEvent.KEYCODE_HOME || 76 keyCode == KeyEvent.KEYCODE_BACK || 77 keyCode == KeyEvent.KEYCODE_CALL || 78 keyCode == KeyEvent.KEYCODE_ENDCALL || 79 keyCode == KeyEvent.KEYCODE_POWER || 80 keyCode == KeyEvent.KEYCODE_HEADSETHOOK || 81 keyCode == KeyEvent.KEYCODE_CAMERA || 82 keyCode == KeyEvent.KEYCODE_FOCUS || 83 keyCode == KeyEvent.KEYCODE_VOLUME_DOWN || 84 keyCode == KeyEvent.KEYCODE_VOLUME_MUTE || 85 keyCode == KeyEvent.KEYCODE_VOLUME_UP) { 86 return true; 87 } 88 89 // We also have to intercept some shortcuts before we send them to the ContentView. 90 if (event.isCtrlPressed() && ( 91 keyCode == KeyEvent.KEYCODE_TAB || 92 keyCode == KeyEvent.KEYCODE_W || 93 keyCode == KeyEvent.KEYCODE_F4)) { 94 return true; 95 } 96 97 return false; 98 } 99 100 // Called when an ImeEvent is sent to the page. Can be used to know when some text is entered 101 // in a page. 102 public void onImeEvent() { 103 } 104 105 /** 106 * Notified when a change to the IME was requested. 107 * 108 * @param requestShow Whether the IME was requested to be shown (may already be showing 109 * though). 110 */ 111 public void onImeStateChangeRequested(boolean requestShow) { 112 } 113 114 // TODO (dtrainor): Should expose getScrollX/Y from ContentView or make 115 // computeHorizontalScrollOffset()/computeVerticalScrollOffset() public. 116 /** 117 * Gives the UI the chance to override each scroll event. 118 * @param dx The amount scrolled in the X direction (in physical pixels). 119 * @param dy The amount scrolled in the Y direction (in physical pixels). 120 * @param scrollX The current X scroll offset (in physical pixels). 121 * @param scrollY The current Y scroll offset (in physical pixels). 122 * @return Whether or not the UI consumed and handled this event. 123 */ 124 public boolean shouldOverrideScroll(float dx, float dy, float scrollX, float scrollY) { 125 return false; 126 } 127 128 /** 129 * Returns an ActionMode.Callback for in-page selection. 130 */ 131 public ActionMode.Callback getSelectActionModeCallback( 132 Context context, ActionHandler actionHandler, boolean incognito) { 133 return new SelectActionModeCallback(context, actionHandler, incognito); 134 } 135 136 /** 137 * Called when the contextual ActionBar is shown. 138 */ 139 public void onContextualActionBarShown() { 140 } 141 142 /** 143 * Called when the contextual ActionBar is hidden. 144 */ 145 public void onContextualActionBarHidden() { 146 } 147 148 /** 149 * Called when a new content intent is requested to be started. 150 */ 151 public void onStartContentIntent(Context context, String intentUrl) { 152 Intent intent; 153 // Perform generic parsing of the URI to turn it into an Intent. 154 try { 155 intent = Intent.parseUri(intentUrl, Intent.URI_INTENT_SCHEME); 156 } catch (URISyntaxException ex) { 157 Log.w(TAG, "Bad URI " + intentUrl + ": " + ex.getMessage()); 158 return; 159 } 160 161 try { 162 context.startActivity(intent); 163 } catch (ActivityNotFoundException ex) { 164 Log.w(TAG, "No application can handle " + intentUrl); 165 } 166 } 167 168 public void onExternalVideoSurfaceRequested(int playerId) { 169 } 170 171 public void onGeometryChanged(int playerId, RectF rect) { 172 } 173 174 public ContentVideoViewClient getContentVideoViewClient() { 175 return null; 176 } 177} 178