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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.calculator2;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.Button;
import android.view.View.OnClickListener;
import android.view.View;
import android.view.MotionEvent;
import android.content.res.Resources;
import java.util.Map;
/**
* Button with click-animation effect.
*/
class ColorButton extends Button implements OnClickListener {
int CLICK_FEEDBACK_COLOR;
static final int CLICK_FEEDBACK_INTERVAL = 10;
static final int CLICK_FEEDBACK_DURATION = 350;
Drawable mButtonBackground;
Drawable mButton;
float mTextX;
float mTextY;
long mAnimStart;
OnClickListener mListener;
public ColorButton(Context context, AttributeSet attrs) {
super(context, attrs);
init();
mListener = ((Calculator) context).mListener;
setOnClickListener(this);
}
public void onClick(View view) {
animateClickFeedback();
mListener.onClick(this);
}
private void init() {
setBackgroundDrawable(null);
Resources res = getResources();
mButtonBackground = res.getDrawable(R.drawable.button_bg);
mButton = res.getDrawable(R.drawable.button);
CLICK_FEEDBACK_COLOR = res.getColor(R.color.magic_flame);
getPaint().setColor(res.getColor(R.color.button_text));
mAnimStart = -1;
}
@Override
public void onSizeChanged(int w, int h, int oldW, int oldH) {
int selfW = mButton.getIntrinsicWidth();
int selfH = mButton.getIntrinsicHeight();
int marginX = (w - selfW) / 2;
int marginY = (h - selfH) / 2;
mButtonBackground.setBounds(marginX, marginY, marginX + selfW, marginY + selfH);
mButton.setBounds(marginX, marginY, marginX + selfW, marginY + selfH);
measureText();
}
private void measureText() {
Paint paint = getPaint();
mTextX = (getWidth() - paint.measureText(getText().toString())) / 2;
mTextY = (getHeight() - paint.ascent() - paint.descent()) / 2;
}
@Override
protected void onTextChanged(CharSequence text, int start, int before, int after) {
measureText();
}
private void drawMagicFlame(int duration, Canvas canvas) {
int alpha = 255 - 255 * duration / CLICK_FEEDBACK_DURATION;
int color = CLICK_FEEDBACK_COLOR | (alpha << 24);
mButtonBackground.setColorFilter(color, PorterDuff.Mode.SRC_IN);
int cx = getWidth() / 2;
int cy = getHeight() / 2;
float angle = 250.0f * duration / CLICK_FEEDBACK_DURATION;
canvas.rotate(angle, cx, cy);
mButtonBackground.draw(canvas);
canvas.rotate(-angle, cx, cy);
}
@Override
public void onDraw(Canvas canvas) {
if (mAnimStart != -1) {
int animDuration = (int) (System.currentTimeMillis() - mAnimStart);
if (animDuration >= CLICK_FEEDBACK_DURATION) {
mButtonBackground.clearColorFilter();
mAnimStart = -1;
} else {
drawMagicFlame(animDuration, canvas);
postInvalidateDelayed(CLICK_FEEDBACK_INTERVAL);
}
} else if (isPressed()) {
drawMagicFlame(0, canvas);
}
mButton.draw(canvas);
CharSequence text = getText();
canvas.drawText(text, 0, text.length(), mTextX, mTextY, getPaint());
}
public void animateClickFeedback() {
mAnimStart = System.currentTimeMillis();
invalidate();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int a = event.getAction();
if (a == MotionEvent.ACTION_DOWN
|| a == MotionEvent.ACTION_CANCEL
|| a == MotionEvent.ACTION_UP) {
invalidate();
}
return super.onTouchEvent(event);
}
}
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