auto import from //depot/cupcake/@135843

1 files changed, 105 insertions, 0 deletions

diff --git a/core/java/android/widget/DoubleDigitManager.java b/core/java/android/widget/DoubleDigitManager.java
new file mode 100644
index 000000000000..1eea1fb06bda
--- /dev/null
+++ b/core/java/android/widget/DoubleDigitManager.java
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2007 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 android.widget;
+
+import android.os.Handler;
+
+/**
+ * Provides callbacks indicating the steps in two digit pressing within a
+ * timeout.
+ *
+ * Package private: only relevant in helping {@link TimeSpinnerHelper}.
+ */
+class DoubleDigitManager {
+
+    private final long timeoutInMillis;
+    private final CallBack mCallBack;
+
+    private Integer intermediateDigit;
+
+    /**
+     * @param timeoutInMillis How long after the first digit is pressed does
+     *   the user have to press the second digit?
+     * @param callBack The callback to indicate what's going on with the user.
+     */
+    public DoubleDigitManager(long timeoutInMillis, CallBack callBack) {
+        this.timeoutInMillis = timeoutInMillis;
+        mCallBack = callBack;
+    }
+
+    /**
+     * Report to this manager that a digit was pressed.
+     * @param digit
+     */
+    public void reportDigit(int digit) {
+        if (intermediateDigit == null) {
+            intermediateDigit = digit;
+
+            new Handler().postDelayed(new Runnable() {
+                public void run() {
+                    if (intermediateDigit != null) {
+                        mCallBack.singleDigitFinal(intermediateDigit);
+                        intermediateDigit = null;
+                    }
+                }
+            }, timeoutInMillis);
+
+            if (!mCallBack.singleDigitIntermediate(digit)) {
+
+                // this wasn't a good candidate for the intermediate digit,
+                // make it the final digit (since there is no opportunity to
+                // reject the final digit).
+                intermediateDigit = null;
+                mCallBack.singleDigitFinal(digit);
+            }
+        } else if (mCallBack.twoDigitsFinal(intermediateDigit, digit)) {
+             intermediateDigit = null;
+        }
+    }
+
+    /**
+     * The callback to indicate what is going on with the digits pressed.
+     */
+    static interface CallBack {
+
+        /**
+         * A digit was pressed, and there are no intermediate digits.
+         * @param digit The digit pressed.
+         * @return Whether the digit was accepted; how the user of this manager
+         *   tells us that the intermediate digit is acceptable as an
+         *   intermediate digit.
+         */
+        boolean singleDigitIntermediate(int digit);
+
+        /**
+         * A single digit was pressed, and it is 'the final answer'.
+         * - a single digit pressed, and the timeout expires.
+         * - a single digit pressed, and {@link #singleDigitIntermediate}
+         *   returned false.
+         * @param digit The digit.
+         */
+        void singleDigitFinal(int digit);
+
+        /**
+         * The user pressed digit1, then digit2 within the timeout.
+         * @param digit1
+         * @param digit2
+         */
+        boolean twoDigitsFinal(int digit1, int digit2);
+    }
+
+}