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111 lines
3.4 KiB
111 lines
3.4 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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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Path;
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import android.graphics.Rect;
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/**
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* A key on the piano for changing the octave up or down.
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*/
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public class OctavePianoKey extends PianoKey {
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/**
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* Creates the key.
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* @param piano - the piano this key is on.
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* @param delta - how the octave should change when this key is pressed.
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*/
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public OctavePianoKey(PianoView piano, int delta) {
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super(piano);
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arrow_ = new Path();
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delta_ = delta;
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}
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/**
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* Sets rect_ to the position of this key, based on the drawing rect of the piano it's on.
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* @param drawingRect - the position of the piano itself.
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* @param octaves - the number of octaves visible on the piano keyboard.
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*/
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public void layout(Rect drawingRect, int octaves) {
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int whiteKeyWidth = getWhiteKeyWidth(drawingRect, octaves);
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rect_.top = 0;
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rect_.bottom = getWhiteKeyHeight(drawingRect);
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if (delta_ <= 0) {
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rect_.left = 0;
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rect_.right = rect_.left + whiteKeyWidth;
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} else {
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rect_.right = drawingRect.right;
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rect_.left = rect_.right - whiteKeyWidth;
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}
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}
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/**
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* Returns true if the current octave of the piano could be changed by delta and still be valid.
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*/
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private boolean isValid() {
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return (piano_.getFirstOctave() + delta_ >= 0 &&
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piano_.getFirstOctave() + piano_.getOctaves() + delta_ <= 8);
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}
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/**
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* Draws the key in the current rect_.
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*/
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public void draw(Canvas canvas) {
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strokePaint_.setColor(Color.BLACK);
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fillPaint_.setColor(Color.BLACK);
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if (isPressed() && isValid()) {
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fillPaint_.setColor(Color.GREEN);
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}
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canvas.drawRect(rect_, fillPaint_);
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canvas.drawRect(rect_, strokePaint_);
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// Draw an arrow in the direction of the delta.
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if (isValid()) {
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arrow_.reset();
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if (delta_ <= 0) {
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arrow_.moveTo(rect_.left + 2, rect_.height() / 2);
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arrow_.lineTo(rect_.right - 2, rect_.height() / 2 - 20);
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arrow_.lineTo(rect_.right - 2, rect_.height() / 2 + 20);
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} else {
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arrow_.moveTo(rect_.right - 2, rect_.height() / 2);
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arrow_.lineTo(rect_.left + 2, rect_.height() / 2 - 20);
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arrow_.lineTo(rect_.left + 2, rect_.height() / 2 + 20);
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}
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arrow_.close();
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fillPaint_.setColor(Color.WHITE);
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canvas.drawPath(arrow_, fillPaint_);
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}
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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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@Override
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protected void onPressedChanged(boolean move) {
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if (isPressed() && isValid()) {
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piano_.changeOctave(delta_);
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}
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}
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// This is just used for drawing, but we don't want to pay to reallocate it every time.
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private Path arrow_;
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// How the octave should change when this key is pressed.
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private int delta_;
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}
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