2012-01-10 15:06:05 +00:00
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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Android code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2012
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Kartikaya Gupta <kgupta@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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package org.mozilla.gecko.ui;
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import org.mozilla.gecko.GeckoAppShell;
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import org.mozilla.gecko.GeckoEvent;
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import org.mozilla.gecko.GeckoEventListener;
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import org.json.JSONObject;
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import org.json.JSONException;
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import android.graphics.PointF;
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import android.os.Handler;
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import android.util.Log;
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class SubdocumentScrollHelper implements GeckoEventListener {
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private static final String LOGTAG = "GeckoSubdocumentScrollHelper";
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private static String MESSAGE_PANNING_OVERRIDE = "Panning:Override";
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private static String MESSAGE_CANCEL_OVERRIDE = "Panning:CancelOverride";
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private static String MESSAGE_SCROLL = "Gesture:Scroll";
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private static String MESSAGE_SCROLL_ACK = "Gesture:ScrollAck";
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private final PanZoomController mPanZoomController;
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private final Handler mUiHandler;
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private boolean mOverridePanning;
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private boolean mOverrideScrollAck;
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private boolean mOverrideScrollPending;
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2012-01-21 17:44:44 +00:00
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private boolean mScrollSucceeded;
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2012-01-10 15:06:05 +00:00
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SubdocumentScrollHelper(PanZoomController controller) {
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mPanZoomController = controller;
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// mUiHandler will be bound to the UI thread since that's where this constructor runs
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mUiHandler = new Handler();
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GeckoAppShell.registerGeckoEventListener(MESSAGE_PANNING_OVERRIDE, this);
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GeckoAppShell.registerGeckoEventListener(MESSAGE_CANCEL_OVERRIDE, this);
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GeckoAppShell.registerGeckoEventListener(MESSAGE_SCROLL_ACK, this);
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}
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boolean scrollBy(PointF displacement) {
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if (! mOverridePanning) {
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return false;
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}
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if (! mOverrideScrollAck) {
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mOverrideScrollPending = true;
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return true;
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}
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mOverrideScrollAck = false;
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mOverrideScrollPending = false;
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JSONObject json = new JSONObject();
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try {
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json.put("x", displacement.x);
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json.put("y", displacement.y);
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} catch (JSONException e) {
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Log.e(LOGTAG, "Error forming subwindow scroll message: ", e);
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}
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2012-02-09 07:18:27 +00:00
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GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent(MESSAGE_SCROLL, json.toString()));
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2012-01-10 15:06:05 +00:00
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return true;
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}
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void cancel() {
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mOverridePanning = false;
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}
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boolean scrolling() {
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return mOverridePanning;
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}
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2012-01-21 17:44:44 +00:00
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boolean lastScrollSucceeded() {
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return mScrollSucceeded;
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}
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2012-01-10 15:06:05 +00:00
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// GeckoEventListener implementation
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public void handleMessage(final String event, final JSONObject message) {
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// this comes in on the gecko thread; hand off the handling to the UI thread
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mUiHandler.post(new Runnable() {
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public void run() {
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Log.i(LOGTAG, "Got message: " + event);
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try {
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if (MESSAGE_PANNING_OVERRIDE.equals(event)) {
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mOverridePanning = true;
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mOverrideScrollAck = true;
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mOverrideScrollPending = false;
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2012-01-21 17:44:44 +00:00
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mScrollSucceeded = true;
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2012-01-10 15:06:05 +00:00
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} else if (MESSAGE_CANCEL_OVERRIDE.equals(event)) {
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mOverridePanning = false;
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} else if (MESSAGE_SCROLL_ACK.equals(event)) {
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mOverrideScrollAck = true;
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2012-01-21 17:44:44 +00:00
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mScrollSucceeded = message.getBoolean("scrolled");
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2012-01-10 15:06:05 +00:00
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if (mOverridePanning && mOverrideScrollPending) {
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scrollBy(mPanZoomController.getDisplacement());
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}
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}
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} catch (Exception e) {
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Log.e(LOGTAG, "Exception handling message", e);
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}
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}
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});
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}
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}
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