1 files changed, 206 insertions, 0 deletions
diff --git a/java/src/org/kelar/inputmethod/latin/EmojiAltPhysicalKeyDetector.java b/java/src/org/kelar/inputmethod/latin/EmojiAltPhysicalKeyDetector.java
new file mode 100644
index 000000000..c8c889e80
--- /dev/null
+++ b/java/src/org/kelar/inputmethod/latin/EmojiAltPhysicalKeyDetector.java
@@ -0,0 +1,206 @@
+/*
+ * Copyright (C) 2014, 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 org.kelar.inputmethod.latin;
+
+import android.content.res.Resources;
+import android.util.Log;
+import android.util.Pair;
+import android.view.KeyEvent;
+
+import org.kelar.inputmethod.keyboard.KeyboardSwitcher;
+import org.kelar.inputmethod.latin.settings.Settings;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+
+import javax.annotation.Nonnull;
+
+/**
+ * A class for detecting Emoji-Alt physical key.
+ */
+final class EmojiAltPhysicalKeyDetector {
+    private static final String TAG = "EmojiAltPhysicalKeyDetector";
+    private static final boolean DEBUG = false;
+
+    private List<EmojiHotKeys> mHotKeysList;
+
+    private static class HotKeySet extends HashSet<Pair<Integer, Integer>> { };
+
+    private abstract class EmojiHotKeys {
+        private final String mName;
+        private final HotKeySet mKeySet;
+
+        boolean mCanFire;
+        int mMetaState;
+
+        public EmojiHotKeys(final String name, HotKeySet keySet) {
+            mName = name;
+            mKeySet = keySet;
+            mCanFire = false;
+        }
+
+        public void onKeyDown(@Nonnull final KeyEvent keyEvent) {
+            if (DEBUG) {
+                Log.d(TAG, "EmojiHotKeys.onKeyDown() - " + mName + " - considering " + keyEvent);
+            }
+
+            final Pair<Integer, Integer> key =
+                    Pair.create(keyEvent.getKeyCode(), keyEvent.getMetaState());
+            if (mKeySet.contains(key)) {
+                if (DEBUG) {
+                   Log.d(TAG, "EmojiHotKeys.onKeyDown() - " + mName + " - enabling action");
+                }
+                mCanFire = true;
+                mMetaState = keyEvent.getMetaState();
+            } else if (mCanFire) {
+                if (DEBUG) {
+                   Log.d(TAG, "EmojiHotKeys.onKeyDown() - " + mName + " - disabling action");
+                }
+                mCanFire = false;
+            }
+        }
+
+        public void onKeyUp(@Nonnull final KeyEvent keyEvent) {
+            if (DEBUG) {
+                Log.d(TAG, "EmojiHotKeys.onKeyUp() - " + mName + " - considering " + keyEvent);
+            }
+
+            final int keyCode = keyEvent.getKeyCode();
+            int metaState = keyEvent.getMetaState();
+            if (KeyEvent.isModifierKey(keyCode)) {
+                 // Try restoring meta stat in case the released key was a modifier.
+                 // I am sure one can come up with scenarios to break this, but it
+                 // seems to work well in practice.
+                 metaState |= mMetaState;
+            }
+
+            final Pair<Integer, Integer> key = Pair.create(keyCode, metaState);
+            if (mKeySet.contains(key)) {
+                if (mCanFire) {
+                    if (!keyEvent.isCanceled()) {
+                        if (DEBUG) {
+                            Log.d(TAG, "EmojiHotKeys.onKeyUp() - " + mName + " - firing action");
+                        }
+                        action();
+                    } else {
+                        // This key up event was a part of key combinations and
+                        // should be ignored.
+                        if (DEBUG) {
+                            Log.d(TAG, "EmojiHotKeys.onKeyUp() - " + mName + " - canceled, ignoring action");
+                        }
+                    }
+                    mCanFire = false;
+                }
+            }
+
+            if (mCanFire) {
+                if (DEBUG) {
+                    Log.d(TAG, "EmojiHotKeys.onKeyUp() - " + mName + " - disabling action");
+                }
+                mCanFire = false;
+            }
+        }
+
+        protected abstract void action();
+    }
+
+    public EmojiAltPhysicalKeyDetector(@Nonnull final Resources resources) {
+        mHotKeysList = new ArrayList<EmojiHotKeys>();
+
+        final HotKeySet emojiSwitchSet = parseHotKeys(
+                resources, R.array.keyboard_switcher_emoji);
+        final EmojiHotKeys emojiHotKeys = new EmojiHotKeys("emoji", emojiSwitchSet) {
+            @Override
+            protected void action() {
+                final KeyboardSwitcher switcher = KeyboardSwitcher.getInstance();
+                switcher.onToggleKeyboard(KeyboardSwitcher.KeyboardSwitchState.EMOJI);
+            }
+        };
+        mHotKeysList.add(emojiHotKeys);
+
+        final HotKeySet symbolsSwitchSet = parseHotKeys(
+                resources, R.array.keyboard_switcher_symbols_shifted);
+        final EmojiHotKeys symbolsHotKeys = new EmojiHotKeys("symbols", symbolsSwitchSet) {
+            @Override
+            protected void action() {
+                final KeyboardSwitcher switcher = KeyboardSwitcher.getInstance();
+                switcher.onToggleKeyboard(KeyboardSwitcher.KeyboardSwitchState.SYMBOLS_SHIFTED);
+            }
+        };
+        mHotKeysList.add(symbolsHotKeys);
+    }
+
+    public void onKeyDown(@Nonnull final KeyEvent keyEvent) {
+        if (DEBUG) {
+            Log.d(TAG, "onKeyDown(): " + keyEvent);
+        }
+
+        if (shouldProcessEvent(keyEvent)) {
+            for (EmojiHotKeys hotKeys : mHotKeysList) {
+                hotKeys.onKeyDown(keyEvent);
+            }
+        }
+    }
+
+    public void onKeyUp(@Nonnull final KeyEvent keyEvent) {
+        if (DEBUG) {
+            Log.d(TAG, "onKeyUp(): " + keyEvent);
+        }
+
+        if (shouldProcessEvent(keyEvent)) {
+            for (EmojiHotKeys hotKeys : mHotKeysList) {
+                hotKeys.onKeyUp(keyEvent);
+            }
+        }
+    }
+
+    private static boolean shouldProcessEvent(@Nonnull final KeyEvent keyEvent) {
+        if (!Settings.getInstance().getCurrent().mEnableEmojiAltPhysicalKey) {
+            // The feature is disabled.
+            if (DEBUG) {
+                Log.d(TAG, "shouldProcessEvent(): Disabled");
+            }
+            return false;
+        }
+
+        return true;
+    }
+
+    private static HotKeySet parseHotKeys(
+            @Nonnull final Resources resources, final int resourceId) {
+        final HotKeySet keySet = new HotKeySet();
+        final String name = resources.getResourceEntryName(resourceId);
+        final String[] values = resources.getStringArray(resourceId);
+        for (int i = 0; values != null && i < values.length; i++) {
+            String[] valuePair = values[i].split(",");
+            if (valuePair.length != 2) {
+                Log.w(TAG, "Expected 2 integers in " + name + "[" + i + "] : " + values[i]);
+            }
+            try {
+                final Integer keyCode = Integer.parseInt(valuePair[0]);
+                final Integer metaState = Integer.parseInt(valuePair[1]);
+                final Pair<Integer, Integer> key = Pair.create(
+                        keyCode, KeyEvent.normalizeMetaState(metaState));
+                keySet.add(key);
+            } catch (NumberFormatException e) {
+                Log.w(TAG, "Failed to parse " + name + "[" + i + "] : " + values[i], e);
+            }
+        }
+        return keySet;
+    }
+}