| /* |
| * 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.content.res.Resources; |
| import android.graphics.Canvas; |
| import android.graphics.Paint; |
| import android.graphics.Paint.Style; |
| import android.util.AttributeSet; |
| import android.view.View.OnClickListener; |
| import android.view.View; |
| import android.view.MotionEvent; |
| import android.widget.Button; |
| |
| /** |
| * 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; |
| |
| float mTextX; |
| float mTextY; |
| long mAnimStart; |
| OnClickListener mListener; |
| Paint mFeedbackPaint; |
| |
| public ColorButton(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| Calculator calc = (Calculator) context; |
| init(calc); |
| mListener = calc.mListener; |
| setOnClickListener(this); |
| } |
| |
| public void onClick(View view) { |
| mListener.onClick(this); |
| } |
| |
| private void init(Calculator calc) { |
| Resources res = getResources(); |
| |
| CLICK_FEEDBACK_COLOR = res.getColor(R.color.magic_flame); |
| mFeedbackPaint = new Paint(); |
| mFeedbackPaint.setStyle(Style.STROKE); |
| mFeedbackPaint.setStrokeWidth(2); |
| getPaint().setColor(res.getColor(R.color.button_text)); |
| |
| mAnimStart = -1; |
| } |
| |
| |
| @Override |
| public void onSizeChanged(int w, int h, int oldW, int oldH) { |
| 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); |
| |
| mFeedbackPaint.setColor(color); |
| canvas.drawRect(1, 1, getWidth() - 1, getHeight() - 1, mFeedbackPaint); |
| } |
| |
| @Override |
| public void onDraw(Canvas canvas) { |
| if (mAnimStart != -1) { |
| int animDuration = (int) (System.currentTimeMillis() - mAnimStart); |
| |
| if (animDuration >= CLICK_FEEDBACK_DURATION) { |
| mAnimStart = -1; |
| } else { |
| drawMagicFlame(animDuration, canvas); |
| postInvalidateDelayed(CLICK_FEEDBACK_INTERVAL); |
| } |
| } else if (isPressed()) { |
| drawMagicFlame(0, 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) { |
| boolean result = super.onTouchEvent(event); |
| |
| switch (event.getAction()) { |
| case MotionEvent.ACTION_UP: |
| if (isPressed()) { |
| animateClickFeedback(); |
| } else { |
| invalidate(); |
| } |
| break; |
| case MotionEvent.ACTION_DOWN: |
| case MotionEvent.ACTION_CANCEL: |
| mAnimStart = -1; |
| invalidate(); |
| break; |
| } |
| |
| return result; |
| } |
| } |