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97 lines
3.2 KiB
97 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 com.levien.synthesizer.R;
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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 button that toggles between showing the events for all of the synthesizer channels or showing
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* just the currently selected channel.
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*/
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public class HideChannelButton extends ScoreViewTool {
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/**
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* Creates a new HideChannelButton, using the given context for loading resources.
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*/
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HideChannelButton(Context context) {
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logger_ = Logger.getLogger(getClass().getName());
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visibleIcon_ = context.getResources().getDrawable(R.drawable.open_eye);
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hiddenIcon_ = context.getResources().getDrawable(R.drawable.closed_eye);
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paint_ = new Paint();
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}
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/**
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* Called when this tool is selected.
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* Changes the channel visibility and then reselects the previous 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.setOtherChannelsVisible(!view.getOtherChannelsVisible());
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view.setTool(previousTool);
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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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paint_.setColor(Color.BLACK);
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paint_.setStyle(Paint.Style.FILL);
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canvas.drawRect(rect, paint_);
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if (score.getOtherChannelsVisible()) {
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visibleIcon_.setBounds(rect);
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visibleIcon_.draw(canvas);
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} else {
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hiddenIcon_.setBounds(rect);
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hiddenIcon_.draw(canvas);
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}
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}
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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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private Drawable visibleIcon_;
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private Drawable hiddenIcon_;
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@SuppressWarnings("unused")
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private Logger logger_;
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}
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