1 files changed, 141 insertions, 0 deletions
diff --git a/src/com/android/music/RepeatingImageButton.java b/src/com/android/music/RepeatingImageButton.java
new file mode 100644
index 0000000..b4e7733
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+++ b/src/com/android/music/RepeatingImageButton.java
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+/*
+ * Copyright (C) 2008 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.music;
+
+import android.content.Context;
+import android.os.SystemClock;
+import android.util.AttributeSet;
+import android.view.KeyEvent;
+import android.view.MotionEvent;
+import android.view.View;
+import android.widget.ImageButton;
+
+/**
+ * A button that will repeatedly call a 'listener' method
+ * as long as the button is pressed.
+ */
+public class RepeatingImageButton extends ImageButton {
+
+    private long mStartTime;
+    private int mRepeatCount;
+    private RepeatListener mListener;
+    private long mInterval = 500;
+    
+    public RepeatingImageButton(Context context) {
+        this(context, null);
+    }
+
+    public RepeatingImageButton(Context context, AttributeSet attrs) {
+        this(context, attrs, android.R.attr.imageButtonStyle);
+    }
+
+    public RepeatingImageButton(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        setFocusable(true);
+        setLongClickable(true);
+    }
+    
+    /**
+     * Sets the listener to be called while the button is pressed and
+     * the interval in milliseconds with which it will be called.
+     * @param l The listener that will be called
+     * @param interval The interval in milliseconds for calls 
+     */
+    public void setRepeatListener(RepeatListener l, long interval) {
+        mListener = l;
+        mInterval = interval;
+    }
+    
+    @Override
+    public boolean performLongClick() {
+        mStartTime = SystemClock.elapsedRealtime();
+        mRepeatCount = 0;
+        post(mRepeater);
+        return true;
+    }
+    
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        if (event.getAction() == MotionEvent.ACTION_UP) {
+            // remove the repeater, but call the hook one more time
+            removeCallbacks(mRepeater);
+            if (mStartTime != 0) {
+                doRepeat(true);
+                mStartTime = 0;
+            }
+        }
+        return super.onTouchEvent(event);
+    }
+
+    @Override
+    public boolean onKeyDown(int keyCode, KeyEvent event) {
+        switch (keyCode) {
+            case KeyEvent.KEYCODE_DPAD_CENTER:
+            case KeyEvent.KEYCODE_ENTER:
+                // need to call super to make long press work, but return
+                // true so that the application doesn't get the down event.
+                super.onKeyDown(keyCode, event);
+                return true;
+        }
+        return super.onKeyDown(keyCode, event);
+    }
+
+    @Override
+    public boolean onKeyUp(int keyCode, KeyEvent event) {
+        switch (keyCode) {
+        case KeyEvent.KEYCODE_DPAD_CENTER:
+        case KeyEvent.KEYCODE_ENTER:
+            // remove the repeater, but call the hook one more time
+            removeCallbacks(mRepeater);
+            if (mStartTime != 0) {
+                doRepeat(true);
+                mStartTime = 0;
+            }
+        }
+        return super.onKeyUp(keyCode, event);
+    }
+    
+    private Runnable mRepeater = new Runnable() {
+        public void run() {
+            doRepeat(false);
+            if (isPressed()) {
+                postDelayed(this, mInterval);
+            }
+        }
+    };
+
+    private  void doRepeat(boolean last) {
+        long now = SystemClock.elapsedRealtime();
+        if (mListener != null) {
+            mListener.onRepeat(this, now - mStartTime, last ? -1 : mRepeatCount++);
+        }
+    }
+    
+    public interface RepeatListener {
+        /**
+         * This method will be called repeatedly at roughly the interval
+         * specified in setRepeatListener(), for as long as the button
+         * is pressed.
+         * @param v The button as a View.
+         * @param duration The number of milliseconds the button has been pressed so far.
+         * @param repeatcount The number of previous calls in this sequence.
+         * If this is going to be the last call in this sequence (i.e. the user
+         * just stopped pressing the button), the value will be -1.  
+         */
+        void onRepeat(View v, long duration, int repeatcount);
+    }
+}