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gaia/apps/keyboard/js/imes/emoji/emoji.js

@@ -0,0 +1,93 @@
+/* global InputMethods, PromiseStorage*/
+
+
+'use strict';
+
+(function() {
+  function RecentKeys() {
+    this._items = [];
+  }
+
+  RecentKeys.prototype.RECENT_KEY_COUNT = 18;
+
+  RecentKeys.prototype.getItems = function() {
+    return this._items || [];
+  };
+
+  RecentKeys.prototype.setItems = function(val) {
+    if (Array.isArray(val) && val.length) {
+      this._items = val.slice(0, this.RECENT_KEY_COUNT);
+    }
+  };
+
+  RecentKeys.prototype.getPanelKeys = function() {
+    if (!this._items) {
+      throw new Error('Emoji:Unable to get recently used keys');
+    }
+
+    return this.getItems().map(function(val) {
+      return { compositeKey: val, type: 'emoji' };
+    });
+  };
+
+  RecentKeys.prototype.add = function(key) {
+    var duplicateKeyIndex = this._items.indexOf(key);
+
+    // splice an element from array can always reduce length by 1.
+    // this ensure that we remove the last element or existent key,
+    // before unshifting clicked key into array.
+    if (this._items.length >= this.RECENT_KEY_COUNT ||
+        duplicateKeyIndex !== -1) {
+      this._items.splice(duplicateKeyIndex, 1);
+    }
+
+    this._items.unshift(key);
+  };
+
+  function EmojiInputMethod() {
+    this._glue = null;
+    this._dbStore = null;
+    this._recentKeys = new RecentKeys();
+  }
+
+  EmojiInputMethod.prototype.EMOJI_DB_NAME = 'Emoji';
+  EmojiInputMethod.prototype.EMOJI_RECENT_STORE_KEY = 'emojiRecentUsedKeys';
+
+  EmojiInputMethod.prototype.init = function(glue) {
+    this._glue = glue;
+    this._dbStore = new PromiseStorage(this.EMOJI_DB_NAME);
+
+    var p = this._dbStore.start()
+    .then(function() {
+      return this._dbStore.getItem(this.EMOJI_RECENT_STORE_KEY);
+    }.bind(this))
+    .then(function(keys) {
+      this._recentKeys.setItems(keys);
+    }.bind(this));
+
+    return p;
+  };
+
+  EmojiInputMethod.prototype.deactivate = function() {
+    return this._dbStore.setItem(
+      this.EMOJI_RECENT_STORE_KEY, this._recentKeys.getItems());
+  };
+
+  EmojiInputMethod.prototype.click = function(key, repeat) {
+    return this._glue.sendKey(key, repeat);
+  };
+
+  EmojiInputMethod.prototype.handleKey = function(key, repeat) {
+    this._recentKeys.add(key.key);
+
+    return  this._glue.sendKey(key, repeat);
+  };
+
+  EmojiInputMethod.prototype.updatePageKeys = function(page) {
+    page.panelKeys = this._recentKeys.getPanelKeys();
+    return page;
+  };
+
+
+  InputMethods.emoji = new EmojiInputMethod();
+}());