Bug 672661 - Backspace key in Swiftkey X causes characters to be duplicated. r=blassey

--HG--
extra : rebase_source : 73e791d969f70e4815527e19588665ca1bfbb700

embedding/android/GeckoInputConnection.java

@@ -57,6 +57,27 @@ public class GeckoInputConnection
     extends BaseInputConnection
     implements TextWatcher
 {
+    private class ChangeNotification {
+        public String mText;
+        public int mStart;
+        public int mEnd;
+        public int mNewEnd;
+
+        ChangeNotification(String text, int start, int oldEnd, int newEnd) {
+            mText = text;
+            mStart = start;
+            mEnd = oldEnd;
+            mNewEnd = newEnd;
+        }
+
+        ChangeNotification(int start, int end) {
+            mText = null;
+            mStart = start;
+            mEnd = end;
+            mNewEnd = 0;
+        }
+    }
+
     public GeckoInputConnection (View targetView) {
         super(targetView, true);
         mQueryResult = new SynchronousQueue<String>();
@@ -65,7 +86,7 @@ public class GeckoInputConnection
     @Override
     public boolean beginBatchEdit() {
         //Log.d("GeckoAppJava", "IME: beginBatchEdit");
-
+        mBatchMode = true;
         return true;
     }
 
@@ -89,6 +110,8 @@ public class GeckoInputConnection
     @Override
     public boolean deleteSurroundingText(int leftLength, int rightLength) {
         //Log.d("GeckoAppJava", "IME: deleteSurroundingText");
+        if (leftLength == 0 && rightLength == 0)
+            return true;
 
         /* deleteSurroundingText is supposed to ignore the composing text,
             so we cancel any pending composition, delete the text, and then
@@ -141,6 +164,21 @@ public class GeckoInputConnection
     public boolean endBatchEdit() {
         //Log.d("GeckoAppJava", "IME: endBatchEdit");
 
+        mBatchMode = false;
+
+        if (!mBatchChanges.isEmpty()) {
+            InputMethodManager imm = (InputMethodManager)
+                GeckoApp.surfaceView.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
+            if (imm != null) {
+                for (ChangeNotification n : mBatchChanges) {
+                    if (n.mText != null)
+                        notifyTextChange(imm, n.mText, n.mStart, n.mEnd, n.mNewEnd);
+                    else
+                        notifySelectionChange(imm, n.mStart, n.mEnd);
+                }
+            }
+            mBatchChanges.clear();
+        }
         return true;
     }
 
@@ -159,11 +197,13 @@ public class GeckoInputConnection
             mComposing = false;
             mComposingText = "";
 
+            if (!mBatchMode) {
                 // Make sure caret stays at the same position
                 GeckoAppShell.sendEventToGecko(
                     new GeckoEvent(GeckoEvent.IME_SET_SELECTION,
                                    mCompositionStart + mCompositionSelStart, 0));
             }
+        }
         return true;
     }
 
@@ -456,6 +496,41 @@ public class GeckoInputConnection
             new GeckoEvent(mCompositionSelStart + mCompositionSelLen, 0,
                            GeckoEvent.IME_RANGE_CARETPOSITION, 0, 0, 0,
                            mComposingText));
+
+        return true;
+    }
+
+    @Override
+    public boolean setComposingRegion(int start, int end) {
+        //Log.d("GeckoAppJava", "IME: setComposingRegion(start=" + start + ", end=" + end + ")");
+        if (start < 0 || end < start)
+            return true;
+
+        CharSequence text = null;
+        if (start == mCompositionStart && end - start == mComposingText.length()) {
+            // Use mComposingText to avoid extra call to Gecko
+            text = mComposingText;
+        }
+
+        finishComposingText();
+
+        if (text == null && start < end) {
+            GeckoAppShell.sendEventToGecko(
+                new GeckoEvent(GeckoEvent.IME_GET_TEXT, start, end - start));
+            try {
+                text = mQueryResult.take();
+            } catch (InterruptedException e) {
+                Log.e("GeckoAppJava", "IME: setComposingRegion interrupted", e);
+                return false;
+            }
+        }
+
+        GeckoAppShell.sendEventToGecko(
+            new GeckoEvent(GeckoEvent.IME_SET_SELECTION, start, end - start));
+
+        // Call setComposingText with the same text to start composition and let Gecko know about new composing region
+        setComposingText(text, 1);
+
         return true;
     }
 
@@ -512,6 +587,11 @@ public class GeckoInputConnection
         // Log.d("GeckoAppShell", String.format("IME: notifyTextChange: text=%s s=%d ne=%d oe=%d",
         //                                      text, start, newEnd, oldEnd));
 
+        if (mBatchMode) {
+            mBatchChanges.add(new ChangeNotification(text, start, oldEnd, newEnd));
+            return;
+        }
+
         mNumPendingChanges = Math.max(mNumPendingChanges - 1, 0);
 
         // If there are pending changes, that means this text is not the most up-to-date version
@@ -543,6 +623,10 @@ public class GeckoInputConnection
     public void notifySelectionChange(InputMethodManager imm,
                                       int start, int end) {
         // Log.d("GeckoAppJava", String.format("IME: notifySelectionChange: s=%d e=%d", start, end));
+        if (mBatchMode) {
+            mBatchChanges.add(new ChangeNotification(start, end));
+            return;
+        }
 
         if (mComposing)
             imm.updateSelection(GeckoApp.surfaceView,
@@ -569,6 +653,8 @@ public class GeckoInputConnection
         mComposingText = "";
         mUpdateRequest = null;
         mNumPendingChanges = 0;
+        mBatchMode = false;
+        mBatchChanges.clear();
     }
 
     // TextWatcher
@@ -629,6 +715,10 @@ public class GeckoInputConnection
     // Number of in flight changes
     int mNumPendingChanges;
 
+    boolean mBatchMode;
+    private CopyOnWriteArrayList<ChangeNotification> mBatchChanges =
+        new CopyOnWriteArrayList<ChangeNotification>();
+
     ExtractedTextRequest mUpdateRequest;
     final ExtractedText mUpdateExtract = new ExtractedText();