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100 lines
3.2 KiB
100 lines
3.2 KiB
/*
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* Copyright 2011 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.score;
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import java.util.logging.Logger;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.graphics.Rect;
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import android.graphics.drawable.Drawable;
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/**
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* A tool for selecting a particular channel in a ScoreView.
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*/
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public class SelectChannelButton extends ScoreViewTool {
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/**
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* Creates a tool for selecting the given channel, loading resources using the given context.
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*/
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SelectChannelButton(Context context, int channel) {
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logger_ = Logger.getLogger(getClass().getName());
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channel_ = channel;
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paint_ = new Paint();
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}
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/**
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* Returns the channel that this control selects.
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*/
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public int getChannel() {
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return channel_;
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}
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/**
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* Draws the button on the toolbar.
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* @param canvas - The canvas to draw the button on.
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* @param score - The ScoreView that this toolbar is for.
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* @param rect - The area of the button to be drawn, including any margin.
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* @param margin - The preferred margin around the button, in screen coordinates.
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*/
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@Override
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public void drawButton(Canvas canvas, ScoreView score, Rect rect, float margin) {
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if (score.getTool() == this) {
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paint_.setColor(Color.WHITE);
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paint_.setStyle(Paint.Style.FILL);
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canvas.drawRect(rect.left - margin / 2,
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rect.top - margin / 2,
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rect.right + margin / 2,
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rect.bottom + margin / 2,
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paint_);
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}
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if (getChannel() == score.getCurrentChannel()) {
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paint_.setColor(score.getColorForChannel(getChannel()));
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} else {
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paint_.setColor(Color.BLACK);
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}
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paint_.setStyle(Paint.Style.FILL);
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canvas.drawRect(rect, paint_);
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Drawable icon = score.getIconForChannel(getChannel());
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icon.setBounds(rect);
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icon.draw(canvas);
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}
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/**
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* Called when this tool is selected.
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* Changes the selected channel for the view and then reselects the previously selected tool.
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* @param view - The ScoreView that this toolbar is for.
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* @param previousTool - The tool that was selected when this one was chosen.
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*/
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@Override
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public void onSelect(ScoreView view, ScoreViewTool previousTool) {
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view.setCurrentChannel(channel_);
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view.setTool(previousTool);
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}
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// The channel this control selects.
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private int channel_;
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// Some objects used in drawing. They are owned here so that they don't have to be reallocated
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// and garbage collected for every pass of drawing.
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private Paint paint_;
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@SuppressWarnings("unused")
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private Logger logger_;
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}
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