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52 lines
1.5 KiB
52 lines
1.5 KiB
/*
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* Copyright 2010 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.levien.synthesizer.android.widgets.piano;
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/**
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* Abstract base class for keys on the piano that play a note when pressed.
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*/
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public abstract class NotePianoKey extends PianoKey {
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/**
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* Creates a new key.
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* @param piano - the piano this key is on.
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* @param octaveOffset - octave of the key, relative to the leftmost octave of the piano.
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* @param key - offset of the key from the start of the octave.
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*/
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public NotePianoKey(PianoView piano, int octaveOffset, int key) {
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super(piano);
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octaveOffset_ = octaveOffset;
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key_ = key;
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}
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/**
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* Called when the pressed_ state has changed.
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*/
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protected void onPressedChanged(boolean move) {
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}
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/**
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* Returns the log frequency of the note of the key.
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*/
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abstract protected double getLogFrequency();
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// Octave of the key, relative to the leftmost octave of the piano.
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protected int octaveOffset_;
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// Offset of the key from the start of the octave.
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protected int key_;
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}
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