android: integrate text selection handles from Fennec

Integrate text selection handles from Fennec and insert middle
handle when a cursor invalidation event is recieved from LO.

Change-Id: I6ba31d46bf89555bdbca9ce4be666039e8bc9041

19 files changed, 441 insertions, 4 deletions

diff --git a/android/experimental/LOAndroid3/res/drawable-hdpi/handle_end.png b/android/experimental/LOAndroid3/res/drawable-hdpi/handle_end.png
new file mode 100644
index 000000000000..d5e204429ef3
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-hdpi/handle_end.png
diff --git a/android/experimental/LOAndroid3/res/drawable-hdpi/handle_middle.png b/android/experimental/LOAndroid3/res/drawable-hdpi/handle_middle.png
new file mode 100644
index 000000000000..5dcee14f7a70
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-hdpi/handle_middle.png
diff --git a/android/experimental/LOAndroid3/res/drawable-hdpi/handle_start.png b/android/experimental/LOAndroid3/res/drawable-hdpi/handle_start.png
new file mode 100644
index 000000000000..b6a8ce79e942
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-hdpi/handle_start.png
diff --git a/android/experimental/LOAndroid3/res/drawable-xhdpi/handle_end.png b/android/experimental/LOAndroid3/res/drawable-xhdpi/handle_end.png
new file mode 100644
index 000000000000..c83b7b603765
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-xhdpi/handle_end.png
diff --git a/android/experimental/LOAndroid3/res/drawable-xhdpi/handle_middle.png b/android/experimental/LOAndroid3/res/drawable-xhdpi/handle_middle.png
new file mode 100644
index 000000000000..2a1774ff98a5
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-xhdpi/handle_middle.png
diff --git a/android/experimental/LOAndroid3/res/drawable-xhdpi/handle_start.png b/android/experimental/LOAndroid3/res/drawable-xhdpi/handle_start.png
new file mode 100644
index 000000000000..9af76544812c
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable-xhdpi/handle_start.png
diff --git a/android/experimental/LOAndroid3/res/drawable/handle_end.png b/android/experimental/LOAndroid3/res/drawable/handle_end.png
new file mode 100644
index 000000000000..32b77dfa6e26
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable/handle_end.png
diff --git a/android/experimental/LOAndroid3/res/drawable/handle_middle.png b/android/experimental/LOAndroid3/res/drawable/handle_middle.png
new file mode 100644
index 000000000000..751eb898b136
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable/handle_middle.png
diff --git a/android/experimental/LOAndroid3/res/drawable/handle_start.png b/android/experimental/LOAndroid3/res/drawable/handle_start.png
new file mode 100644
index 000000000000..cf12a0dcdcf3
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/drawable/handle_start.png
diff --git a/android/experimental/LOAndroid3/res/layout/activity_main.xml b/android/experimental/LOAndroid3/res/layout/activity_main.xml
index 1b1bb0779b7e..e9a946f6b9dd 100644
--- a/android/experimental/LOAndroid3/res/layout/activity_main.xml
+++ b/android/experimental/LOAndroid3/res/layout/activity_main.xml
@@ -22,6 +22,9 @@
                 android:id="@+id/layer_view"
                 android:layout_width="fill_parent"
                 android:layout_height="fill_parent"/>
+
+            <include layout="@layout/text_selection_handles"/>
+
         </RelativeLayout>
 
         <RelativeLayout
diff --git a/android/experimental/LOAndroid3/res/layout/text_selection_handles.xml b/android/experimental/LOAndroid3/res/layout/text_selection_handles.xml
new file mode 100644
index 000000000000..1f0d8165729a
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/layout/text_selection_handles.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+<merge xmlns:android="http://schemas.android.com/apk/res/android"
+       xmlns:gecko="http://schemas.android.com/apk/res-auto">
+
+    <org.mozilla.gecko.TextSelectionHandle android:id="@+id/start_handle"
+                                           android:layout_width="@dimen/text_selection_handle_width"
+                                           android:layout_height="@dimen/text_selection_handle_height"
+                                           android:src="@drawable/handle_start"
+                                           android:visibility="gone"
+                                           gecko:handleType="start"/>
+
+    <org.mozilla.gecko.TextSelectionHandle android:id="@+id/middle_handle"
+                                           android:layout_width="@dimen/text_selection_handle_width"
+                                           android:layout_height="@dimen/text_selection_handle_height"
+                                           android:src="@drawable/handle_middle"
+                                           android:visibility="gone"
+                                           gecko:handleType="middle"/>
+
+    <org.mozilla.gecko.TextSelectionHandle android:id="@+id/end_handle"
+                                           android:layout_width="@dimen/text_selection_handle_width"
+                                           android:layout_height="@dimen/text_selection_handle_height"
+                                           android:src="@drawable/handle_end"
+                                           android:visibility="gone"
+                                           gecko:handleType="end"/>
+</merge>
diff --git a/android/experimental/LOAndroid3/res/values/attrs.xml b/android/experimental/LOAndroid3/res/values/attrs.xml
new file mode 100644
index 000000000000..ed7397891d97
--- /dev/null
+++ b/android/experimental/LOAndroid3/res/values/attrs.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+<resources>
+
+    <declare-styleable name="TextSelectionHandle">
+        <attr name="handleType">
+            <flag name="start" value="0x01"/>
+            <flag name="middle" value="0x02"/>
+            <flag name="end" value="0x03"/>
+        </attr>
+    </declare-styleable>
+
+</resources>
+
diff --git a/android/experimental/LOAndroid3/res/values/dimens.xml b/android/experimental/LOAndroid3/res/values/dimens.xml
index 47c82246738c..1e5d7716f192 100644
--- a/android/experimental/LOAndroid3/res/values/dimens.xml
+++ b/android/experimental/LOAndroid3/res/values/dimens.xml
@@ -2,4 +2,7 @@
     <!-- Default screen margins, per the Android Design guidelines. -->
     <dimen name="activity_horizontal_margin">16dp</dimen>
     <dimen name="activity_vertical_margin">16dp</dimen>
+    <dimen name="text_selection_handle_width">30dp</dimen>
+    <dimen name="text_selection_handle_height">44dp</dimen>
+    <dimen name="text_selection_handle_shadow">2dp</dimen>
 </resources>
diff --git a/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitThread.java b/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitThread.java
index c8bcc23d76a3..5cb8f319964f 100644
--- a/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitThread.java
+++ b/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitThread.java
@@ -168,8 +168,6 @@ public class LOKitThread extends Thread implements TileProvider.TileInvalidation
 
     private void touch(String touchType, MotionEvent motionEvent, PointF mDocumentTouchCoordinate) {
         LibreOfficeMainActivity.mAppContext.showSoftKeyboard();
-        float x = motionEvent.getX();
-        float y = motionEvent.getY();
         mTileProvider.mouseButtonDown(mDocumentTouchCoordinate);
     }
 
diff --git a/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitTileProvider.java b/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitTileProvider.java
index 3e3412a74984..553945033274 100644
--- a/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitTileProvider.java
+++ b/android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitTileProvider.java
@@ -10,6 +10,7 @@ import org.libreoffice.kit.DirectBufferAllocator;
 import org.libreoffice.kit.Document;
 import org.libreoffice.kit.LibreOfficeKit;
 import org.libreoffice.kit.Office;
+import org.mozilla.gecko.TextSelection;
 import org.mozilla.gecko.gfx.BufferedCairoImage;
 import org.mozilla.gecko.gfx.CairoImage;
 import org.mozilla.gecko.gfx.GeckoLayerClient;
@@ -303,6 +304,11 @@ public class LOKitTileProvider implements TileProvider, Document.MessageCallback
     private void mouseButton(int type, PointF inDocument) {
         int x = (int) pixelToTwip(inDocument.x, mDPI);
         int y = (int) pixelToTwip(inDocument.y, mDPI);
+
+        TextSelection textSelection = LibreOfficeMainActivity.mAppContext.getTextSelection();
+        textSelection.positionHandle("MIDDLE", new RectF(inDocument.x, inDocument.y, inDocument.x, inDocument.y));
+        textSelection.showHandle("MIDDLE");
+
         mDocument.postMouseEvent(type, x, y);
     }
 
@@ -376,9 +382,12 @@ public class LOKitTileProvider implements TileProvider, Document.MessageCallback
                 break;
             }
             case Document.CALLBACK_INVALIDATE_VISIBLE_CURSOR: {
+                Log.i(LOGTAG, "Invalidate visible cursor: " + payload);
                 RectF rect = convertCallbackMessageStringToRectF(payload);
                 if (rect != null) {
-                    //tileInvalidationCallback.invalidate(rect);
+                    TextSelection textSelection = LibreOfficeMainActivity.mAppContext.getTextSelection();
+                    textSelection.positionHandle("MIDDLE", rect);
+                    textSelection.showHandle("MIDDLE");
                 }
                 break;
             }
diff --git a/android/experimental/LOAndroid3/src/java/org/libreoffice/LibreOfficeMainActivity.java b/android/experimental/LOAndroid3/src/java/org/libreoffice/LibreOfficeMainActivity.java
index bca8230d2458..362fb786623e 100644
--- a/android/experimental/LOAndroid3/src/java/org/libreoffice/LibreOfficeMainActivity.java
+++ b/android/experimental/LOAndroid3/src/java/org/libreoffice/LibreOfficeMainActivity.java
@@ -20,6 +20,8 @@ import android.widget.ListView;
 import android.widget.RelativeLayout;
 import android.widget.TextView;
 
+import org.mozilla.gecko.TextSelection;
+import org.mozilla.gecko.TextSelectionHandle;
 import org.mozilla.gecko.ZoomConstraints;
 import org.mozilla.gecko.gfx.GeckoLayerClient;
 import org.mozilla.gecko.gfx.LayerView;
@@ -45,6 +47,7 @@ public class LibreOfficeMainActivity extends LOAbout {
     private List<DocumentPartView> mDocumentPartView = new ArrayList<DocumentPartView>();
     private DocumentPartViewListAdapter mDocumentPartViewListAdapter;
     private String mInputFile;
+    private TextSelection mTextSelection;
 
     public LibreOfficeMainActivity() {
         super(/*newActivity=*/false);
@@ -124,6 +127,12 @@ public class LibreOfficeMainActivity extends LOAbout {
             sLOKitThread.clearQueue();
         }
 
+        TextSelectionHandle startHandle = (TextSelectionHandle) findViewById(R.id.start_handle);
+        TextSelectionHandle middleHandle = (TextSelectionHandle) findViewById(R.id.middle_handle);
+        TextSelectionHandle endHandle = (TextSelectionHandle) findViewById(R.id.end_handle);
+
+        mTextSelection = new TextSelection(startHandle, middleHandle, endHandle);
+
         mLayerClient = new GeckoLayerClient(this);
         mLayerClient.setZoomConstraints(new ZoomConstraints(true));
         LayerView layerView = (LayerView) findViewById(R.id.layer_view);
@@ -231,6 +240,10 @@ public class LibreOfficeMainActivity extends LOAbout {
         alertDialog.show();
     }
 
+    public TextSelection getTextSelection() {
+        return mTextSelection;
+    }
+
     private class DocumentPartClickListener implements android.widget.AdapterView.OnItemClickListener {
         @Override
         public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
diff --git a/android/experimental/LOAndroid3/src/java/org/libreoffice/ViewFactory.java b/android/experimental/LOAndroid3/src/java/org/libreoffice/ViewFactory.java
index c26ad222e0d9..68f88d990103 100644
--- a/android/experimental/LOAndroid3/src/java/org/libreoffice/ViewFactory.java
+++ b/android/experimental/LOAndroid3/src/java/org/libreoffice/ViewFactory.java
@@ -6,11 +6,13 @@ import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 
+import org.mozilla.gecko.TextSelectionHandle;
 import org.mozilla.gecko.gfx.LayerView;
 
 public class ViewFactory implements LayoutInflater.Factory {
     private static final String LOGTAG = ViewFactory.class.getSimpleName();
     private static final String LAYER_VIEW_ID = "org.mozilla.gecko.gfx.LayerView";
+    private static final String TEXT_SELECTION_HANDLE_ID = "org.mozilla.gecko.TextSelectionHandle";
     private static final ViewFactory INSTANCE = new ViewFactory();
 
     private ViewFactory() {
@@ -25,8 +27,10 @@ public class ViewFactory implements LayoutInflater.Factory {
         if (name.equals(LAYER_VIEW_ID)) {
             Log.i(LOGTAG, "Creating custom Gecko view: " + name);
             return new LayerView(context, attrs);
+        } else if (name.equals(TEXT_SELECTION_HANDLE_ID)) {
+            Log.i(LOGTAG, "Creating custom Gecko view: " + name);
+            return new TextSelectionHandle(context, attrs);
         }
-
         return null;
     }
 }
\ No newline at end of file
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/TextSelection.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/TextSelection.java
new file mode 100644
index 000000000000..f09e93a9dbdb
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/TextSelection.java
@@ -0,0 +1,191 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko;
+
+import android.graphics.RectF;
+import android.util.Log;
+import android.view.View;
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+import org.libreoffice.LOKitShell;
+import org.libreoffice.LibreOfficeMainActivity;
+import org.mozilla.gecko.gfx.Layer;
+import org.mozilla.gecko.gfx.LayerView;
+import org.mozilla.gecko.util.FloatUtils;
+
+public class TextSelection extends Layer {
+    private static final String LOGTAG = "GeckoTextSelection";
+
+    private final TextSelectionHandle mStartHandle;
+    private final TextSelectionHandle mMiddleHandle;
+    private final TextSelectionHandle mEndHandle;
+
+    private float mViewLeft;
+    private float mViewTop;
+    private float mViewZoom;
+
+    public TextSelection(TextSelectionHandle startHandle,
+                         TextSelectionHandle middleHandle,
+                         TextSelectionHandle endHandle) {
+        mStartHandle = startHandle;
+        mMiddleHandle = middleHandle;
+        mEndHandle = endHandle;
+
+        // Only register listeners if we have valid start/middle/end handles
+        if (mStartHandle == null || mMiddleHandle == null || mEndHandle == null) {
+            Log.e(LOGTAG, "Failed to initialize text selection because at least one handle is null");
+        }
+    }
+
+    void destroy() {
+    }
+
+    public void handleMessage(String event, JSONObject message) {
+        try {
+            if (event.equals("TextSelection:ShowHandles")) {
+                final JSONArray handles = message.getJSONArray("handles");
+                LibreOfficeMainActivity.mAppContext.mMainHandler.post(new Runnable() {
+                    public void run() {
+                        try {
+                            for (int i=0; i < handles.length(); i++) {
+                                String handle = handles.getString(i);
+
+                                if (handle.equals("START"))
+                                    mStartHandle.setVisibility(View.VISIBLE);
+                                else if (handle.equals("MIDDLE"))
+                                    mMiddleHandle.setVisibility(View.VISIBLE);
+                                else
+                                    mEndHandle.setVisibility(View.VISIBLE);
+                            }
+
+                            mViewLeft = 0.0f;
+                            mViewTop = 0.0f;
+                            mViewZoom = 0.0f;
+                            LayerView layerView = LOKitShell.getLayerView();
+                            if (layerView != null) {
+                                layerView.addLayer(TextSelection.this);
+                            }
+                        } catch(Exception e) {}
+                    }
+                });
+            } else if (event.equals("TextSelection:HideHandles")) {
+                final JSONArray handles = message.getJSONArray("handles");
+                LibreOfficeMainActivity.mAppContext.mMainHandler.post(new Runnable() {
+                    public void run() {
+                        try {
+                            LayerView layerView = LOKitShell.getLayerView();
+                            if (layerView != null) {
+                                layerView.removeLayer(TextSelection.this);
+                            }
+
+                            for (int i=0; i < handles.length(); i++) {
+                                String handle = handles.getString(i);
+                                if (handle.equals("START"))
+                                    mStartHandle.setVisibility(View.GONE);
+                                else if (handle.equals("MIDDLE"))
+                                    mMiddleHandle.setVisibility(View.GONE);
+                                else
+                                    mEndHandle.setVisibility(View.GONE);
+                            }
+
+                        } catch(Exception e) {}
+                    }
+                });
+            } else if (event.equals("TextSelection:PositionHandles")) {
+                final JSONArray positions = message.getJSONArray("positions");
+                LibreOfficeMainActivity.mAppContext.mMainHandler.post(new Runnable() {
+                    public void run() {
+                        try {
+                            for (int i=0; i < positions.length(); i++) {
+                                JSONObject position = positions.getJSONObject(i);
+                                String handle = position.getString("handle");
+                                int left = position.getInt("left");
+                                int top = position.getInt("top");
+
+                                if (handle.equals("START"))
+                                    mStartHandle.positionFromGecko(left, top);
+                                else if (handle.equals("MIDDLE"))
+                                    mMiddleHandle.positionFromGecko(left, top);
+                                else
+                                    mEndHandle.positionFromGecko(left, top);
+                            }
+                        } catch (Exception e) { }
+                    }
+                });
+            }
+        } catch (Exception e) {
+            Log.e(LOGTAG, "Exception handling message \"" + event + "\":", e);
+        }
+    }
+
+    @Override
+    public void draw(final RenderContext context) {
+        // cache the relevant values from the context and bail out if they are the same. we do this
+        // because this draw function gets called a lot (once per compositor frame) and we want to
+        // avoid doing a lot of extra work in cases where it's not needed.
+        if (FloatUtils.fuzzyEquals(mViewLeft, context.viewport.left)
+                && FloatUtils.fuzzyEquals(mViewTop, context.viewport.top)
+                && FloatUtils.fuzzyEquals(mViewZoom, context.zoomFactor)) {
+            return;
+        }
+        mViewLeft = context.viewport.left;
+        mViewTop = context.viewport.top;
+        mViewZoom = context.zoomFactor;
+
+        LOKitShell.getMainHandler().post(new Runnable() {
+            public void run() {
+                mStartHandle.repositionWithViewport(context.viewport.left, context.viewport.top, context.zoomFactor);
+                mMiddleHandle.repositionWithViewport(context.viewport.left, context.viewport.top, context.zoomFactor);
+                mEndHandle.repositionWithViewport(context.viewport.left, context.viewport.top, context.zoomFactor);
+            }
+        });
+    }
+
+    public void showHandle(final String handleType) {
+        LOKitShell.getMainHandler().post(new Runnable() {
+            public void run() {
+                try {
+                    TextSelectionHandle handle;
+                    if (handleType.equals("START"))
+                        handle = mStartHandle;
+                    else if (handleType.equals("MIDDLE"))
+                        handle = mMiddleHandle;
+                    else
+                        handle = mEndHandle;
+
+                    handle.setVisibility(View.VISIBLE);
+
+                    mViewLeft = 0.0f;
+                    mViewTop = 0.0f;
+                    mViewZoom = 0.0f;
+                    LayerView layerView = LOKitShell.getLayerView();
+                    if (layerView != null) {
+                        layerView.addLayer(TextSelection.this);
+                    }
+                } catch (Exception e) {
+                }
+            }
+        });
+    }
+
+    public void positionHandle(final String handleType, final RectF position) {
+        LOKitShell.getMainHandler().post(new Runnable() {
+            public void run() {
+                try {
+                    TextSelectionHandle handle;
+                    if (handleType.equals("START"))
+                        handle = mStartHandle;
+                    else if (handleType.equals("MIDDLE"))
+                        handle = mMiddleHandle;
+                    else
+                        handle = mEndHandle;
+
+                    handle.positionFromGecko((int) position.left, (int) position.top);
+                } catch (Exception e) { }
+            }
+        });
+    }
+}
diff --git a/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/TextSelectionHandle.java b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/TextSelectionHandle.java
new file mode 100644
index 000000000000..92ca9d42a114
--- /dev/null
+++ b/android/experimental/LOAndroid3/src/java/org/mozilla/gecko/TextSelectionHandle.java
@@ -0,0 +1,170 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this file,
+* You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko;
+
+import org.libreoffice.LOKitShell;
+import org.libreoffice.R;
+import org.mozilla.gecko.gfx.ImmutableViewportMetrics;
+import org.mozilla.gecko.gfx.LayerView;
+
+import org.json.JSONObject;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.PointF;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.MotionEvent;
+import android.view.View;
+import android.widget.ImageView;
+import android.widget.RelativeLayout;
+
+public class TextSelectionHandle extends ImageView implements View.OnTouchListener {
+    private static final String LOGTAG = "GeckoTextSelectionHandle";
+
+    private enum HandleType { START, MIDDLE, END };
+
+    private final HandleType mHandleType;
+    private final int mWidth;
+    private final int mHeight;
+    private final int mShadow;
+
+    private int mLeft;
+    private int mTop;
+    private PointF mGeckoPoint;
+    private int mTouchStartX;
+    private int mTouchStartY;
+
+    private RelativeLayout.LayoutParams mLayoutParams;
+
+    public TextSelectionHandle(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        setOnTouchListener(this);
+
+        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.TextSelectionHandle);
+        int handleType = a.getInt(R.styleable.TextSelectionHandle_handleType, 0x01);
+
+        if (handleType == 0x01)
+            mHandleType = HandleType.START;
+        else if (handleType == 0x02)
+            mHandleType = HandleType.MIDDLE;
+        else
+            mHandleType = HandleType.END;
+
+        mGeckoPoint = new PointF(0.0f, 0.0f);
+
+        mWidth = getResources().getDimensionPixelSize(R.dimen.text_selection_handle_width);
+        mHeight = getResources().getDimensionPixelSize(R.dimen.text_selection_handle_height);
+        mShadow = getResources().getDimensionPixelSize(R.dimen.text_selection_handle_shadow);
+    }
+
+    public boolean onTouch(View v, MotionEvent event) {
+        switch (event.getActionMasked()) {
+            case MotionEvent.ACTION_DOWN: {
+                mTouchStartX = Math.round(event.getX());
+                mTouchStartY = Math.round(event.getY());
+                break;
+            }
+            case MotionEvent.ACTION_UP: {
+                mTouchStartX = 0;
+                mTouchStartY = 0;
+
+                // Reposition handles to line up with ends of selection
+                JSONObject args = new JSONObject();
+                try {
+                    args.put("handleType", mHandleType.toString());
+                } catch (Exception e) {
+                    Log.e(LOGTAG, "Error building JSON arguments for TextSelection:Position");
+                }
+                //GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent("TextSelection:Position", args.toString()));
+                break;
+            }
+            case MotionEvent.ACTION_MOVE: {
+                move(Math.round(event.getX()), Math.round(event.getY()));
+                break;
+            }
+        }
+        return true;
+    }
+
+    private void move(int newX, int newY) {
+        mLeft = mLeft + newX - mTouchStartX;
+        mTop = mTop + newY - mTouchStartY;
+
+        LayerView layerView = LOKitShell.getLayerView();
+        if (layerView == null) {
+            Log.e(LOGTAG, "Can't move selection because layerView is null");
+            return;
+        }
+        // Send x coordinate on the right side of the start handle, left side of the end handle.
+        float left = (float) mLeft;
+        if (mHandleType.equals(HandleType.START))
+            left +=  mWidth - mShadow;
+        else if (mHandleType.equals(HandleType.MIDDLE))
+            left +=  (float) ((mWidth - mShadow) / 2);
+        else
+            left += mShadow;
+
+        PointF geckoPoint = new PointF(left, (float) mTop);
+        geckoPoint = layerView.getLayerClient().convertViewPointToLayerPoint(geckoPoint);
+
+        JSONObject args = new JSONObject();
+        try {
+            args.put("handleType", mHandleType.toString());
+            args.put("x", Math.round(geckoPoint.x));
+            args.put("y", Math.round(geckoPoint.y));
+        } catch (Exception e) {
+            Log.e(LOGTAG, "Error building JSON arguments for TextSelection:Move");
+        }
+        //GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent("TextSelection:Move", args.toString()));
+
+        setLayoutPosition();
+    }
+
+    void positionFromGecko(int left, int top) {
+        Log.i(LOGTAG, "positionFromGecko: " + left + " " + top);
+        LayerView layerView = LOKitShell.getLayerView();
+        if (layerView == null) {
+            Log.e(LOGTAG, "Can't position handle because layerView is null");
+            return;
+        }
+
+        mGeckoPoint = new PointF((float) left, (float) top);
+        ImmutableViewportMetrics metrics = layerView.getViewportMetrics();
+        repositionWithViewport(metrics.viewportRectLeft, metrics.viewportRectTop, metrics.zoomFactor);
+    }
+
+    void repositionWithViewport(float x, float y, float zoom) {
+        PointF viewPoint = new PointF((mGeckoPoint.x * zoom) - x,
+                (mGeckoPoint.y * zoom) - y);
+
+        mLeft = Math.round(viewPoint.x);
+        if (mHandleType.equals(HandleType.START))
+            mLeft -=  mWidth - mShadow;
+        else if (mHandleType.equals(HandleType.MIDDLE))
+            mLeft -=  (float) ((mWidth - mShadow) / 2);
+        else
+            mLeft -= mShadow;
+
+        mTop = Math.round(viewPoint.y);
+
+        setLayoutPosition();
+    }
+
+    private void setLayoutPosition() {
+        if (mLayoutParams == null) {
+            mLayoutParams = (RelativeLayout.LayoutParams) getLayoutParams();
+            // Set negative right/bottom margins so that the handles can be dragged outside of
+            // the content area (if they are dragged to the left/top, the dyanmic margins set
+            // below will take care of that).
+            mLayoutParams.rightMargin = 0 - mWidth;
+            mLayoutParams.bottomMargin = 0 - mHeight;
+        }
+
+        mLayoutParams.leftMargin = mLeft;
+        mLayoutParams.topMargin = mTop;
+        setLayoutParams(mLayoutParams);
+    }
+}