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81 lines
3.1 KiB
81 lines
3.1 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 com.levien.synthesizer.core.music.Music.Event;
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import android.graphics.Canvas;
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import android.graphics.Rect;
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import android.view.MotionEvent;
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/**
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* A base class for tools on the ScoreView's toolbar.
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*/
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public abstract class ScoreViewTool {
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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 tool 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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public abstract void drawButton(Canvas canvas, ScoreView score, Rect rect, float margin);
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/**
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* Called when this tool is selected.
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* @param view - The ScoreView that this tool 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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public void onSelect(ScoreView view, ScoreViewTool previousTool) {}
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/**
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* Called when the user touches the ScoreView while this tool is selected.
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* @param view - The ScoreView that this tool is for.
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* @param event - The touch event that triggered this handler.
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* @return true iff this tool handled the touch event.
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*/
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public boolean onTouch(ScoreView view, MotionEvent event) {
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return false;
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}
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/**
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* Called after each key is drawn, to give this tool a chance to draw over it.
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* See ScoreView.onDraw() for more information on how ScoreView is drawn.
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* @param key - The key that was drawn.
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* @param canvas - The canvas the key is drawn into.
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* @param rect - The area of the key on the canvas.
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*/
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public void afterDrawKey(int key, Canvas canvas, Rect rect) {}
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/**
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* Called after each event is drawn, to give this tool a chance to draw over it.
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* See ScoreView.onDraw() for more information on how ScoreView is drawn.
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* @param event - The event that was drawn.
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* @param canvas - The canvas the key is drawn into.
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* @param rect - The area of the key on the canvas.
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*/
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public void afterDrawEvent(Event event, Canvas canvas, Rect rect) {}
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/**
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* Called after the entire score is drawn, to give this tool a chance to draw over it.
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* See ScoreView.onDraw() for more information on how ScoreView is drawn.
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* @param view - The ScoreView being drawn.
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* @param canvas - The canvas the key is drawn into.
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* @param rect - The area of the key on the canvas.
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*/
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public void afterDrawScore(ScoreView view, Canvas canvas, Rect rect) {}
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}
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