1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mobile/android/base/TextSelection.java Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,322 @@
1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this file,
1.6 + * You can obtain one at http://mozilla.org/MPL/2.0/. */
1.7 +
1.8 +package org.mozilla.gecko;
1.9 +
1.10 +import org.mozilla.gecko.gfx.BitmapUtils;
1.11 +import org.mozilla.gecko.gfx.BitmapUtils.BitmapLoader;
1.12 +import org.mozilla.gecko.gfx.Layer;
1.13 +import org.mozilla.gecko.gfx.LayerView;
1.14 +import org.mozilla.gecko.gfx.LayerView.DrawListener;
1.15 +import org.mozilla.gecko.menu.GeckoMenu;
1.16 +import org.mozilla.gecko.menu.GeckoMenuItem;
1.17 +import org.mozilla.gecko.EventDispatcher;
1.18 +import org.mozilla.gecko.util.FloatUtils;
1.19 +import org.mozilla.gecko.util.GeckoEventListener;
1.20 +import org.mozilla.gecko.util.ThreadUtils;
1.21 +import org.mozilla.gecko.ActionModeCompat.Callback;
1.22 +
1.23 +import android.content.Context;
1.24 +import android.app.Activity;
1.25 +import android.graphics.drawable.Drawable;
1.26 +import android.view.Menu;
1.27 +import android.view.MenuItem;
1.28 +
1.29 +import org.json.JSONArray;
1.30 +import org.json.JSONException;
1.31 +import org.json.JSONObject;
1.32 +
1.33 +import java.util.Timer;
1.34 +import java.util.TimerTask;
1.35 +
1.36 +import android.util.Log;
1.37 +import android.view.View;
1.38 +
1.39 +class TextSelection extends Layer implements GeckoEventListener {
1.40 + private static final String LOGTAG = "GeckoTextSelection";
1.41 +
1.42 + private final TextSelectionHandle mStartHandle;
1.43 + private final TextSelectionHandle mMiddleHandle;
1.44 + private final TextSelectionHandle mEndHandle;
1.45 + private final EventDispatcher mEventDispatcher;
1.46 +
1.47 + private final DrawListener mDrawListener;
1.48 + private boolean mDraggingHandles;
1.49 +
1.50 + private float mViewLeft;
1.51 + private float mViewTop;
1.52 + private float mViewZoom;
1.53 +
1.54 + private String mCurrentItems;
1.55 +
1.56 + private TextSelectionActionModeCallback mCallback;
1.57 +
1.58 + // These timers are used to avoid flicker caused by selection handles showing/hiding quickly. For isntance
1.59 + // when moving between single handle caret mode and two handle selection mode.
1.60 + private Timer mActionModeTimer = new Timer("actionMode");
1.61 + private class ActionModeTimerTask extends TimerTask {
1.62 + @Override
1.63 + public void run() {
1.64 + ThreadUtils.postToUiThread(new Runnable() {
1.65 + @Override
1.66 + public void run() {
1.67 + endActionMode();
1.68 + }
1.69 + });
1.70 + }
1.71 + };
1.72 + private ActionModeTimerTask mActionModeTimerTask;
1.73 +
1.74 + TextSelection(TextSelectionHandle startHandle,
1.75 + TextSelectionHandle middleHandle,
1.76 + TextSelectionHandle endHandle,
1.77 + EventDispatcher eventDispatcher,
1.78 + GeckoApp activity) {
1.79 + mStartHandle = startHandle;
1.80 + mMiddleHandle = middleHandle;
1.81 + mEndHandle = endHandle;
1.82 + mEventDispatcher = eventDispatcher;
1.83 +
1.84 + mDrawListener = new DrawListener() {
1.85 + @Override
1.86 + public void drawFinished() {
1.87 + if (!mDraggingHandles) {
1.88 + GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent("TextSelection:LayerReflow", ""));
1.89 + }
1.90 + }
1.91 + };
1.92 +
1.93 + // Only register listeners if we have valid start/middle/end handles
1.94 + if (mStartHandle == null || mMiddleHandle == null || mEndHandle == null) {
1.95 + Log.e(LOGTAG, "Failed to initialize text selection because at least one handle is null");
1.96 + } else {
1.97 + registerEventListener("TextSelection:ShowHandles");
1.98 + registerEventListener("TextSelection:HideHandles");
1.99 + registerEventListener("TextSelection:PositionHandles");
1.100 + registerEventListener("TextSelection:Update");
1.101 + registerEventListener("TextSelection:DraggingHandle");
1.102 + }
1.103 + }
1.104 +
1.105 + void destroy() {
1.106 + unregisterEventListener("TextSelection:ShowHandles");
1.107 + unregisterEventListener("TextSelection:HideHandles");
1.108 + unregisterEventListener("TextSelection:PositionHandles");
1.109 + unregisterEventListener("TextSelection:Update");
1.110 + unregisterEventListener("TextSelection:DraggingHandle");
1.111 + }
1.112 +
1.113 + private TextSelectionHandle getHandle(String name) {
1.114 + if (name.equals("START")) {
1.115 + return mStartHandle;
1.116 + } else if (name.equals("MIDDLE")) {
1.117 + return mMiddleHandle;
1.118 + } else {
1.119 + return mEndHandle;
1.120 + }
1.121 + }
1.122 +
1.123 + @Override
1.124 + public void handleMessage(final String event, final JSONObject message) {
1.125 + if ("TextSelection:DraggingHandle".equals(event)) {
1.126 + mDraggingHandles = message.optBoolean("dragging", false);
1.127 + return;
1.128 + }
1.129 +
1.130 + ThreadUtils.postToUiThread(new Runnable() {
1.131 + @Override
1.132 + public void run() {
1.133 + try {
1.134 + if (event.equals("TextSelection:ShowHandles")) {
1.135 + final JSONArray handles = message.getJSONArray("handles");
1.136 + for (int i=0; i < handles.length(); i++) {
1.137 + String handle = handles.getString(i);
1.138 + getHandle(handle).setVisibility(View.VISIBLE);
1.139 + }
1.140 +
1.141 + mViewLeft = 0.0f;
1.142 + mViewTop = 0.0f;
1.143 + mViewZoom = 0.0f;
1.144 +
1.145 + // Create text selection layer and add draw-listener for positioning on reflows
1.146 + LayerView layerView = GeckoAppShell.getLayerView();
1.147 + if (layerView != null) {
1.148 + layerView.addDrawListener(mDrawListener);
1.149 + layerView.addLayer(TextSelection.this);
1.150 + }
1.151 +
1.152 + if (handles.length() > 1)
1.153 + GeckoAppShell.performHapticFeedback(true);
1.154 + } else if (event.equals("TextSelection:Update")) {
1.155 + if (mActionModeTimerTask != null)
1.156 + mActionModeTimerTask.cancel();
1.157 + showActionMode(message.getJSONArray("actions"));
1.158 + } else if (event.equals("TextSelection:HideHandles")) {
1.159 + // Remove draw-listener and text selection layer
1.160 + LayerView layerView = GeckoAppShell.getLayerView();
1.161 + if (layerView != null) {
1.162 + layerView.removeDrawListener(mDrawListener);
1.163 + layerView.removeLayer(TextSelection.this);
1.164 + }
1.165 +
1.166 + mActionModeTimerTask = new ActionModeTimerTask();
1.167 + mActionModeTimer.schedule(mActionModeTimerTask, 250);
1.168 +
1.169 + mStartHandle.setVisibility(View.GONE);
1.170 + mMiddleHandle.setVisibility(View.GONE);
1.171 + mEndHandle.setVisibility(View.GONE);
1.172 + } else if (event.equals("TextSelection:PositionHandles")) {
1.173 + final boolean rtl = message.getBoolean("rtl");
1.174 + final JSONArray positions = message.getJSONArray("positions");
1.175 + for (int i=0; i < positions.length(); i++) {
1.176 + JSONObject position = positions.getJSONObject(i);
1.177 + int left = position.getInt("left");
1.178 + int top = position.getInt("top");
1.179 +
1.180 + TextSelectionHandle handle = getHandle(position.getString("handle"));
1.181 + handle.setVisibility(position.getBoolean("hidden") ? View.GONE : View.VISIBLE);
1.182 + handle.positionFromGecko(left, top, rtl);
1.183 + }
1.184 + }
1.185 + } catch (JSONException e) {
1.186 + Log.e(LOGTAG, "JSON exception", e);
1.187 + }
1.188 + }
1.189 + });
1.190 + }
1.191 +
1.192 + private void showActionMode(final JSONArray items) {
1.193 + String itemsString = items.toString();
1.194 + if (itemsString.equals(mCurrentItems)) {
1.195 + return;
1.196 + }
1.197 + mCurrentItems = itemsString;
1.198 +
1.199 + if (mCallback != null) {
1.200 + mCallback.updateItems(items);
1.201 + return;
1.202 + }
1.203 +
1.204 + final Context context = mStartHandle.getContext();
1.205 + if (context instanceof ActionModeCompat.Presenter) {
1.206 + final ActionModeCompat.Presenter presenter = (ActionModeCompat.Presenter) context;
1.207 + mCallback = new TextSelectionActionModeCallback(items);
1.208 + presenter.startActionModeCompat(mCallback);
1.209 + }
1.210 + }
1.211 +
1.212 + private void endActionMode() {
1.213 + Context context = mStartHandle.getContext();
1.214 + if (context instanceof ActionModeCompat.Presenter) {
1.215 + final ActionModeCompat.Presenter presenter = (ActionModeCompat.Presenter) context;
1.216 + presenter.endActionModeCompat();
1.217 + }
1.218 + mCurrentItems = null;
1.219 + }
1.220 +
1.221 + @Override
1.222 + public void draw(final RenderContext context) {
1.223 + // cache the relevant values from the context and bail out if they are the same. we do this
1.224 + // because this draw function gets called a lot (once per compositor frame) and we want to
1.225 + // avoid doing a lot of extra work in cases where it's not needed.
1.226 + final float viewLeft = context.viewport.left - context.offset.x;
1.227 + final float viewTop = context.viewport.top - context.offset.y;
1.228 + final float viewZoom = context.zoomFactor;
1.229 +
1.230 + if (FloatUtils.fuzzyEquals(mViewLeft, viewLeft)
1.231 + && FloatUtils.fuzzyEquals(mViewTop, viewTop)
1.232 + && FloatUtils.fuzzyEquals(mViewZoom, viewZoom)) {
1.233 + return;
1.234 + }
1.235 + mViewLeft = viewLeft;
1.236 + mViewTop = viewTop;
1.237 + mViewZoom = viewZoom;
1.238 +
1.239 + ThreadUtils.postToUiThread(new Runnable() {
1.240 + @Override
1.241 + public void run() {
1.242 + mStartHandle.repositionWithViewport(viewLeft, viewTop, viewZoom);
1.243 + mMiddleHandle.repositionWithViewport(viewLeft, viewTop, viewZoom);
1.244 + mEndHandle.repositionWithViewport(viewLeft, viewTop, viewZoom);
1.245 + }
1.246 + });
1.247 + }
1.248 +
1.249 + private void registerEventListener(String event) {
1.250 + mEventDispatcher.registerEventListener(event, this);
1.251 + }
1.252 +
1.253 + private void unregisterEventListener(String event) {
1.254 + mEventDispatcher.unregisterEventListener(event, this);
1.255 + }
1.256 +
1.257 + private class TextSelectionActionModeCallback implements Callback {
1.258 + private JSONArray mItems;
1.259 + private ActionModeCompat mActionMode;
1.260 +
1.261 + public TextSelectionActionModeCallback(JSONArray items) {
1.262 + mItems = items;
1.263 + }
1.264 +
1.265 + public void updateItems(JSONArray items) {
1.266 + mItems = items;
1.267 + if (mActionMode != null) {
1.268 + mActionMode.invalidate();
1.269 + }
1.270 + }
1.271 +
1.272 + @Override
1.273 + public boolean onPrepareActionMode(final ActionModeCompat mode, final Menu menu) {
1.274 + // Android would normally expect us to only update the state of menu items here
1.275 + // To make the js-java interaction a bit simpler, we just wipe out the menu here and recreate all
1.276 + // the javascript menu items in onPrepare instead. This will be called any time invalidate() is called on the
1.277 + // action mode.
1.278 + menu.clear();
1.279 +
1.280 + int length = mItems.length();
1.281 + for (int i = 0; i < length; i++) {
1.282 + try {
1.283 + final JSONObject obj = mItems.getJSONObject(i);
1.284 + final GeckoMenuItem menuitem = (GeckoMenuItem) menu.add(0, i, 0, obj.optString("label"));
1.285 + final int actionEnum = obj.optBoolean("showAsAction") ? GeckoMenuItem.SHOW_AS_ACTION_ALWAYS : GeckoMenuItem.SHOW_AS_ACTION_NEVER;
1.286 + menuitem.setShowAsAction(actionEnum, R.attr.menuItemActionModeStyle);
1.287 +
1.288 + BitmapUtils.getDrawable(mStartHandle.getContext(), obj.optString("icon"), new BitmapLoader() {
1.289 + public void onBitmapFound(Drawable d) {
1.290 + if (d != null) {
1.291 + menuitem.setIcon(d);
1.292 + }
1.293 + }
1.294 + });
1.295 + } catch(Exception ex) {
1.296 + Log.i(LOGTAG, "Exception building menu", ex);
1.297 + }
1.298 + }
1.299 + return true;
1.300 + }
1.301 +
1.302 + public boolean onCreateActionMode(ActionModeCompat mode, Menu menu) {
1.303 + mActionMode = mode;
1.304 + return true;
1.305 + }
1.306 +
1.307 + public boolean onActionItemClicked(ActionModeCompat mode, MenuItem item) {
1.308 + try {
1.309 + final JSONObject obj = mItems.getJSONObject(item.getItemId());
1.310 + GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent("TextSelection:Action", obj.optString("id")));
1.311 + return true;
1.312 + } catch(Exception ex) {
1.313 + Log.i(LOGTAG, "Exception calling action", ex);
1.314 + }
1.315 + return false;
1.316 + }
1.317 +
1.318 + // Called when the user exits the action mode
1.319 + public void onDestroyActionMode(ActionModeCompat mode) {
1.320 + mActionMode = null;
1.321 + mCallback = null;
1.322 + GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent("TextSelection:End", null));
1.323 + }
1.324 + }
1.325 +}
