Implement popup suggestions pane

Bug: 5023981
Change-Id: Ie1d69131dbf884a3f6a2beb3ac3427e5437c1486

1 files changed, 237 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/latin/MoreSuggestionsView.java b/java/src/com/android/inputmethod/latin/MoreSuggestionsView.java
new file mode 100644
index 000000000..828490112
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/MoreSuggestionsView.java
@@ -0,0 +1,237 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.util.AttributeSet;
+import android.view.Gravity;
+import android.view.View;
+import android.widget.PopupWindow;
+
+import com.android.inputmethod.keyboard.Key;
+import com.android.inputmethod.keyboard.KeyDetector;
+import com.android.inputmethod.keyboard.Keyboard;
+import com.android.inputmethod.keyboard.KeyboardActionListener;
+import com.android.inputmethod.keyboard.KeyboardView;
+import com.android.inputmethod.keyboard.MoreKeysPanel;
+import com.android.inputmethod.keyboard.PointerTracker;
+import com.android.inputmethod.keyboard.PointerTracker.DrawingProxy;
+import com.android.inputmethod.keyboard.PointerTracker.TimerProxy;
+
+import java.util.List;
+
+/**
+ * A view that renders a virtual {@link MoreSuggestions}. It handles rendering of keys and detecting
+ * key presses and touch movements.
+ */
+public class MoreSuggestionsView extends KeyboardView implements MoreKeysPanel {
+    private final int[] mCoordinates = new int[2];
+
+    private final KeyDetector mKeyDetector;
+
+    private Controller mController;
+    private KeyboardActionListener mListener;
+    private int mOriginX;
+    private int mOriginY;
+
+    private static class SuggestionsPaneKeyDetector extends KeyDetector {
+        private final int mSlideAllowanceSquare;
+        private final int mSlideAllowanceSquareTop;
+
+        public SuggestionsPaneKeyDetector(float slideAllowance) {
+            super(/* keyHysteresisDistance */0);
+            mSlideAllowanceSquare = (int)(slideAllowance * slideAllowance);
+            // Top slide allowance is slightly longer (sqrt(2) times) than other edges.
+            mSlideAllowanceSquareTop = mSlideAllowanceSquare * 2;
+        }
+
+        @Override
+        public boolean alwaysAllowsSlidingInput() {
+            return true;
+        }
+
+        @Override
+        protected int getMaxNearbyKeys() {
+            // No nearby key will be returned.
+            return 1;
+        }
+
+        @Override
+        public int getKeyIndexAndNearbyCodes(int x, int y, final int[] allCodes) {
+            final List<Key> keys = getKeyboard().mKeys;
+            final int touchX = getTouchX(x);
+            final int touchY = getTouchY(y);
+
+            int nearestIndex = NOT_A_KEY;
+            int nearestDist = (y < 0) ? mSlideAllowanceSquareTop : mSlideAllowanceSquare;
+            final int keyCount = keys.size();
+            for (int index = 0; index < keyCount; index++) {
+                final int dist = keys.get(index).squaredDistanceToEdge(touchX, touchY);
+                if (dist < nearestDist) {
+                    nearestIndex = index;
+                    nearestDist = dist;
+                }
+            }
+
+            if (allCodes != null && nearestIndex != NOT_A_KEY)
+                allCodes[0] = keys.get(nearestIndex).mCode;
+            return nearestIndex;
+        }
+    }
+
+    private static final TimerProxy EMPTY_TIMER_PROXY = new TimerProxy.Adapter();
+
+    private final KeyboardActionListener mSuggestionsPaneListener =
+            new KeyboardActionListener.Adapter() {
+        @Override
+        public void onPress(int primaryCode, boolean withSliding) {
+            mListener.onPress(primaryCode, withSliding);
+        }
+
+        @Override
+        public void onRelease(int primaryCode, boolean withSliding) {
+            mListener.onRelease(primaryCode, withSliding);
+        }
+
+        @Override
+        public void onCodeInput(int primaryCode, int[] keyCodes, int x, int y) {
+            mListener.onCustomRequest(primaryCode - MoreSuggestions.SUGGESTION_CODE_BASE);
+        }
+
+        @Override
+        public void onCancelInput() {
+            mListener.onCancelInput();
+        }
+    };
+
+    public MoreSuggestionsView(Context context, AttributeSet attrs) {
+        this(context, attrs, R.attr.suggestionsPaneViewStyle);
+    }
+
+    public MoreSuggestionsView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+
+        final Resources res = context.getResources();
+        // Override default ProximityKeyDetector.
+        mKeyDetector = new SuggestionsPaneKeyDetector(res.getDimension(
+                R.dimen.more_suggestions_slide_allowance));
+        // Remove gesture detector on suggestions pane
+        setKeyPreviewPopupEnabled(false, 0);
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        final Keyboard keyboard = getKeyboard();
+        if (keyboard != null) {
+            final int width = keyboard.mOccupiedWidth + getPaddingLeft() + getPaddingRight();
+            final int height = keyboard.mOccupiedHeight + getPaddingTop() + getPaddingBottom();
+            setMeasuredDimension(width, height);
+        } else {
+            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+        }
+    }
+
+    @Override
+    public void setKeyboard(Keyboard keyboard) {
+        super.setKeyboard(keyboard);
+        mKeyDetector.setKeyboard(keyboard, -getPaddingLeft(),
+                -getPaddingTop() + mVerticalCorrection);
+    }
+
+    @Override
+    public KeyDetector getKeyDetector() {
+        return mKeyDetector;
+    }
+
+    @Override
+    public KeyboardActionListener getKeyboardActionListener() {
+        return mSuggestionsPaneListener;
+    }
+
+    @Override
+    public DrawingProxy getDrawingProxy() {
+        return  this;
+    }
+
+    @Override
+    public TimerProxy getTimerProxy() {
+        return EMPTY_TIMER_PROXY;
+    }
+
+    @Override
+    public void setKeyPreviewPopupEnabled(boolean previewEnabled, int delay) {
+        // Suggestions pane needs no pop-up key preview displayed, so we pass always false with a
+        // delay of 0. The delay does not matter actually since the popup is not shown anyway.
+        super.setKeyPreviewPopupEnabled(false, 0);
+    }
+
+    @Override
+    public void setShifted(boolean shifted) {
+        // Nothing to do with.
+    }
+
+    @Override
+    public void showMoreKeysPanel(View parentView, Controller controller, int pointX, int pointY,
+            PopupWindow window, KeyboardActionListener listener) {
+        mController = controller;
+        mListener = listener;
+        final View container = (View)getParent();
+        final MoreSuggestions pane = (MoreSuggestions)getKeyboard();
+
+        parentView.getLocationInWindow(mCoordinates);
+        final int paneLeft = pointX - (pane.mOccupiedWidth / 2) + parentView.getPaddingLeft();
+        final int x = wrapUp(Math.max(0, Math.min(paneLeft,
+                parentView.getWidth() - pane.mOccupiedWidth))
+                - container.getPaddingLeft() + mCoordinates[0],
+                container.getMeasuredWidth(), 0, parentView.getWidth());
+        final int y = pointY
+                - (container.getMeasuredHeight() - container.getPaddingBottom())
+                + parentView.getPaddingTop() + mCoordinates[1];
+
+        window.setContentView(container);
+        window.setWidth(container.getMeasuredWidth());
+        window.setHeight(container.getMeasuredHeight());
+        window.showAtLocation(parentView, Gravity.NO_GRAVITY, x, y);
+
+        mOriginX = x + container.getPaddingLeft() - mCoordinates[0];
+        mOriginY = y + container.getPaddingTop() - mCoordinates[1];
+    }
+
+    private static int wrapUp(int x, int width, int left, int right) {
+        if (x < left)
+            return left;
+        if (x + width > right)
+            return right - width;
+        return x;
+    }
+
+    @Override
+    public boolean dismissMoreKeysPanel() {
+        return mController.dismissMoreKeysPanel();
+    }
+
+    @Override
+    public int translateX(int x) {
+        return x - mOriginX;
+    }
+
+    @Override
+    public int translateY(int y) {
+        return y - mOriginY;
+    }
+}