package com.ufreedom;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.BlurMaskFilter;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.os.Build;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.OvershootInterpolator;
/**
* Author UFreedom
*
*/
public class YummyTextSwitcher extends View {
private static final int FRAME_NUMBER_MIDDLE = 30;
private static final int FRAME_NUMBER_START = 3;
private static final int FRAME_NUMBER_END = 3;
private static final int DURATION_MIDDLE_FRAME = 800;
private static final String TAG = "YummyTextSwitcher";
private float mTextSize;
private Paint mTextPaint;
private int mTextColor;
private FrameEvaluator mFrameEvaluator;
private BlurMaskFilter mMaskFilterFirst;
private BlurMaskFilter mMaskFilterSecond;
private BlurMaskFilter mMaskFilterMiddle;
private float scrollY = 0.0f;
private Paint testPaint;
private Paint mMiddleFramePaint;
private Paint mFirstFramePaint;
private Paint mSecondFramePaint;
private Rect drawRect = new Rect();
private float mFrameOffset;
public YummyTextSwitcher(Context context) {
this(context, null);
}
public YummyTextSwitcher(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public YummyTextSwitcher(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
TypedArray arr = context.obtainStyledAttributes(attrs, R.styleable.YummyTextSwitcher, 0, 0);
mTextSize = arr.getDimensionPixelSize(R.styleable.YummyTextSwitcher_textSize, 80);
mTextColor = arr.getColor(R.styleable.YummyTextSwitcher_textColor, Color.BLACK);
if (arr.hasValue(R.styleable.YummyTextSwitcher_frameOffset)) {
mFrameOffset = arr.getFloat(R.styleable.YummyTextSwitcher_frameOffset, -1.0f);
}
arr.recycle();
init();
}
private void init() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
//View从API Level 11才加入setLayerType方法
//设置myView以软件渲染模式绘图
setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}
mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mTextPaint.setTextSize(mTextSize);
mTextPaint.setAntiAlias(true);
mTextPaint.setTextSize(mTextSize);
mTextPaint.setColor(mTextColor);
mTextPaint.setStyle(Paint.Style.FILL);
mTextPaint.setTextAlign(Paint.Align.CENTER);
mFirstFramePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mFirstFramePaint.setTextSize(mTextSize);
mFirstFramePaint.setAntiAlias(true);
mFirstFramePaint.setTextSize(mTextSize);
mFirstFramePaint.setColor(mTextColor);
mFirstFramePaint.setStyle(Paint.Style.FILL);
mFirstFramePaint.setTextAlign(Paint.Align.CENTER);
mSecondFramePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mSecondFramePaint.setTextSize(mTextSize);
mSecondFramePaint.setAntiAlias(true);
mSecondFramePaint.setTextSize(mTextSize);
mSecondFramePaint.setColor(mTextColor);
mSecondFramePaint.setStyle(Paint.Style.FILL);
mSecondFramePaint.setTextAlign(Paint.Align.CENTER);
mMiddleFramePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mMiddleFramePaint.setTextSize(mTextSize);
mMiddleFramePaint.setAntiAlias(true);
mMiddleFramePaint.setTextSize(mTextSize);
mMiddleFramePaint.setColor(mTextColor);
mMiddleFramePaint.setStyle(Paint.Style.FILL);
mMiddleFramePaint.setTextAlign(Paint.Align.CENTER);
mMaskFilterFirst = new BlurMaskFilter(3, BlurMaskFilter.Blur.NORMAL);
mMaskFilterSecond = new BlurMaskFilter(8, BlurMaskFilter.Blur.NORMAL);
mMaskFilterMiddle = new BlurMaskFilter(18, BlurMaskFilter.Blur.NORMAL);
mFirstFramePaint.setMaskFilter(mMaskFilterFirst);
mSecondFramePaint.setMaskFilter(mMaskFilterSecond);
mMiddleFramePaint.setMaskFilter(mMaskFilterMiddle);
testPaint = new Paint();
testPaint.setStyle(Paint.Style.FILL);
testPaint.setColor(Color.WHITE);
if (mFrameOffset <= 0) {
Paint.FontMetricsInt fmi = mTextPaint.getFontMetricsInt();
mFrameOffset = fmi.bottom - fmi.top;
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (mFrameEvaluator == null){
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
return;
}
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
int widthPaddingOffset = getPaddingLeft() + getPaddingRight();
if (widthMode == MeasureSpec.AT_MOST && heightMode == MeasureSpec.AT_MOST) {
float maxWidth = getDesireWidth(mTextPaint, mFrameEvaluator);
Paint.FontMetricsInt fmi = mTextPaint.getFontMetricsInt();
setMeasuredDimension((int) maxWidth + widthPaddingOffset, fmi.bottom - fmi.top);
} else if (widthMode == MeasureSpec.AT_MOST) {
float maxWidth = getDesireWidth(mTextPaint, mFrameEvaluator);
setMeasuredDimension((int) maxWidth + widthPaddingOffset, heightSize);
} else if (heightMode == MeasureSpec.AT_MOST) {
Paint.FontMetricsInt fmi = mTextPaint.getFontMetricsInt();
setMeasuredDimension(widthSize + widthPaddingOffset, fmi.bottom - fmi.top);
} else {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
private static float getDesireWidth(Paint mTextPaint, FrameEvaluator mFrameEvaluator) {
float maxWidth = 0;
for (int i = 0; i < FRAME_NUMBER_START; i++) {
float width = mTextPaint.measureText(mFrameEvaluator.getStartFrame(i));
if (width > maxWidth) {
maxWidth = width;
}
}
for (int i = 0; i < FRAME_NUMBER_END; i++) {
float width = mTextPaint.measureText(mFrameEvaluator.getEndFrame(i));
if (width > maxWidth) {
maxWidth = width;
}
}
for (int i = 0; i < FRAME_NUMBER_MIDDLE; i++) {
float width = mTextPaint.measureText(mFrameEvaluator.getMiddleFrame(i * 1.0f / FRAME_NUMBER_MIDDLE));
if (width > maxWidth) {
maxWidth = width;
}
}
return maxWidth;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
drawInit(canvas);
}
private void drawInit(Canvas canvas) {
float x = (float) (getWidth() / 2.0);
float y = (float) (getHeight() / 2.0);
Paint.FontMetricsInt fmi = mTextPaint.getFontMetricsInt();
float baseline = (float) (y - (fmi.bottom / 2.0 + fmi.top / 2.0));
//draw the three start frame
canvas.drawText(mFrameEvaluator.getStartFrame(0), x, baseline + scrollY, mTextPaint);
canvas.drawText(mFrameEvaluator.getStartFrame(1), x, baseline + mFrameOffset + scrollY, mFirstFramePaint);
canvas.drawText(mFrameEvaluator.getStartFrame(2), x, baseline + mFrameOffset * 2 + scrollY, mSecondFramePaint);
//draw middle frame
for (int i = 0; i < FRAME_NUMBER_MIDDLE; i++) {
canvas.drawText(mFrameEvaluator.getMiddleFrame(i * 1.0f / FRAME_NUMBER_MIDDLE), x, baseline + mFrameOffset * (3 + i) + scrollY, mMiddleFramePaint);
}
//draw the three end frame
canvas.drawText(mFrameEvaluator.getEndFrame(0), x, baseline + mFrameOffset * (FRAME_NUMBER_MIDDLE + 3) + scrollY, mSecondFramePaint);
canvas.drawText(mFrameEvaluator.getEndFrame(1), x, baseline + mFrameOffset * (FRAME_NUMBER_MIDDLE + 4) + scrollY, mFirstFramePaint);
canvas.drawText(mFrameEvaluator.getEndFrame(2), x, baseline + mFrameOffset * (FRAME_NUMBER_MIDDLE + 5) + scrollY, mTextPaint);
}
public void startAnim() {
ObjectAnimator anim2 = ObjectAnimator.ofFloat(this, "scrollY", 0, -mFrameOffset * 8);
anim2.setInterpolator(new AccelerateInterpolator(5));
anim2.setDuration(400);
ObjectAnimator anim3 = ObjectAnimator.ofFloat(this, "scrollY", -mFrameOffset * 8, -mFrameOffset * (FRAME_NUMBER_MIDDLE + FRAME_NUMBER_START + FRAME_NUMBER_END - 1));
anim3.setInterpolator(new OvershootInterpolator(0.45f));
anim3.setDuration(DURATION_MIDDLE_FRAME);
AnimatorSet animatorSet = new AnimatorSet();
animatorSet.playSequentially(anim2, anim3);
animatorSet.start();
}
public void setScrollY(float scrollY) {
this.scrollY = scrollY;
invalidate();
}
private void printLog(String log) {
Log.e(TAG, String.format("----> %s", log));
}
public void setFrameOffset(float mFrameOffset) {
this.mFrameOffset = mFrameOffset;
}
public void setTextSize(float size) {
if (size != mTextPaint.getTextSize()) {
mTextPaint.setTextSize(size);
mFirstFramePaint.setTextSize(size);
mSecondFramePaint.setTextSize(size);
mMiddleFramePaint.setTextSize(size);
requestLayout();
invalidate();
}
}
public void setTypeface(Typeface tf) {
if (mTextPaint.getTypeface() != tf) {
mTextPaint.setTypeface(tf);
mFirstFramePaint.setTypeface(tf);
mSecondFramePaint.setTypeface(tf);
mMiddleFramePaint.setTypeface(tf);
requestLayout();
invalidate();
}
}
public void setTextColor(int color) {
if (mTextPaint.getColor() != color) {
mTextPaint.setColor(color);
mFirstFramePaint.setColor(color);
mSecondFramePaint.setColor(color);
mMiddleFramePaint.setColor(color);
invalidate();
}
}
public void setFrameInterpolator(FrameEvaluator mFrameEvaluator) {
this.mFrameEvaluator = mFrameEvaluator;
requestLayout();
invalidate();
}
}
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