ContentViewClient.java revision d3868032626d59662ff73b372b5d584c1d144c53
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 /** 63 * Notifies the client that the renderer backing the ContentView has crashed. This is a legacy 64 * method to be dropped when all clients switch to onRendererCrash(). 65 */ 66 @Deprecated 67 public void onTabCrash() { 68 } 69 70 /** 71 * Notifies the client that the renderer backing the ContentView has crashed. 72 * @param crashedWhileOomProtected True iff the renderer died while being bound with a high 73 * priority binding, which indicates that it was probably an actual crash (as opposed to the 74 * renderer being killed by the OS out-of-memory killer). 75 */ 76 public void onRendererCrash(boolean processWasOomProtected) { 77 } 78 79 public boolean shouldOverrideKeyEvent(KeyEvent event) { 80 int keyCode = event.getKeyCode(); 81 // We need to send almost every key to WebKit. However: 82 // 1. We don't want to block the device on the renderer for 83 // some keys like menu, home, call. 84 // 2. There are no WebKit equivalents for some of these keys 85 // (see app/keyboard_codes_win.h) 86 // Note that these are not the same set as KeyEvent.isSystemKey: 87 // for instance, AKEYCODE_MEDIA_* will be dispatched to webkit. 88 if (keyCode == KeyEvent.KEYCODE_MENU || 89 keyCode == KeyEvent.KEYCODE_HOME || 90 keyCode == KeyEvent.KEYCODE_BACK || 91 keyCode == KeyEvent.KEYCODE_CALL || 92 keyCode == KeyEvent.KEYCODE_ENDCALL || 93 keyCode == KeyEvent.KEYCODE_POWER || 94 keyCode == KeyEvent.KEYCODE_HEADSETHOOK || 95 keyCode == KeyEvent.KEYCODE_CAMERA || 96 keyCode == KeyEvent.KEYCODE_FOCUS || 97 keyCode == KeyEvent.KEYCODE_VOLUME_DOWN || 98 keyCode == KeyEvent.KEYCODE_VOLUME_MUTE || 99 keyCode == KeyEvent.KEYCODE_VOLUME_UP) { 100 return true; 101 } 102 103 // We also have to intercept some shortcuts before we send them to the ContentView. 104 if (event.isCtrlPressed() && ( 105 keyCode == KeyEvent.KEYCODE_TAB || 106 keyCode == KeyEvent.KEYCODE_W || 107 keyCode == KeyEvent.KEYCODE_F4)) { 108 return true; 109 } 110 111 return false; 112 } 113 114 // Called when an ImeEvent is sent to the page. Can be used to know when some text is entered 115 // in a page. 116 public void onImeEvent() { 117 } 118 119 /** 120 * Notified when a change to the IME was requested. 121 * 122 * @param requestShow Whether the IME was requested to be shown (may already be showing 123 * though). 124 */ 125 public void onImeStateChangeRequested(boolean requestShow) { 126 } 127 128 // TODO (dtrainor): Should expose getScrollX/Y from ContentView or make 129 // computeHorizontalScrollOffset()/computeVerticalScrollOffset() public. 130 /** 131 * Gives the UI the chance to override each scroll event. 132 * @param dx The amount scrolled in the X direction (in physical pixels). 133 * @param dy The amount scrolled in the Y direction (in physical pixels). 134 * @param scrollX The current X scroll offset (in physical pixels). 135 * @param scrollY The current Y scroll offset (in physical pixels). 136 * @return Whether or not the UI consumed and handled this event. 137 */ 138 public boolean shouldOverrideScroll(float dx, float dy, float scrollX, float scrollY) { 139 return false; 140 } 141 142 /** 143 * Returns an ActionMode.Callback for in-page selection. 144 */ 145 public ActionMode.Callback getSelectActionModeCallback( 146 Context context, ActionHandler actionHandler, boolean incognito) { 147 return new SelectActionModeCallback(context, actionHandler, incognito); 148 } 149 150 /** 151 * Called when the contextual ActionBar is shown. 152 */ 153 public void onContextualActionBarShown() { 154 } 155 156 /** 157 * Called when the contextual ActionBar is hidden. 158 */ 159 public void onContextualActionBarHidden() { 160 } 161 162 /** 163 * Called when a new content intent is requested to be started. 164 */ 165 public void onStartContentIntent(Context context, String intentUrl) { 166 Intent intent; 167 // Perform generic parsing of the URI to turn it into an Intent. 168 try { 169 intent = Intent.parseUri(intentUrl, Intent.URI_INTENT_SCHEME); 170 } catch (URISyntaxException ex) { 171 Log.w(TAG, "Bad URI " + intentUrl + ": " + ex.getMessage()); 172 return; 173 } 174 175 try { 176 context.startActivity(intent); 177 } catch (ActivityNotFoundException ex) { 178 Log.w(TAG, "No application can handle " + intentUrl); 179 } 180 } 181 182 public void onExternalVideoSurfaceRequested(int playerId) { 183 } 184 185 public void onGeometryChanged(int playerId, RectF rect) { 186 } 187 188 public ContentVideoViewClient getContentVideoViewClient() { 189 return null; 190 } 191} 192