/*
* Copyright 2017 simplezhli
*
* 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.github.zl.changetablayout;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.RectF;
import android.text.Layout;
import android.text.StaticLayout;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.View;
/**
* 作者：weilu on 2017/3/17 11:21
*/
class ChangeTextView extends View {
private int level;
private Paint mPaint;
private TextPaint mTextPaint;
private float textSize;
private String text = "";
private int indicatorPadding;
private int defaultTabTextColor;
private int selectedTabTextColor;
private StaticLayout mStaticLayout;
public ChangeTextView(Context context) {
this(context, null);
}
public ChangeTextView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public ChangeTextView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
final DisplayMetrics dm = getResources().getDisplayMetrics();
final float density = getResources().getDisplayMetrics().density;
int indicatorPadding = (int) (Constant.SELECTED_INDICATOR_PADDING_DIPS * density);
float textSize = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, Constant.TAB_VIEW_TEXT_SIZE_SP, dm);
int defaultTabTextColor = Constant.GRAY;
int selectedTabTextColor = Constant.WHITE;
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ChangeTabLayout);
textSize = a.getDimension(R.styleable.ChangeTabLayout_ctl_defaultTabTextSize, textSize);
defaultTabTextColor = a.getColor(R.styleable.ChangeTabLayout_ctl_defaultTabTextColor, defaultTabTextColor);
selectedTabTextColor = a.getColor(R.styleable.ChangeTabLayout_ctl_selectedTabTextColor, selectedTabTextColor);
indicatorPadding = a.getDimensionPixelSize(R.styleable.ChangeTabLayout_ctl_indicatorPadding, indicatorPadding);
a.recycle();
this.textSize = textSize;
this.indicatorPadding = indicatorPadding;
this.defaultTabTextColor = defaultTabTextColor;
this.selectedTabTextColor = selectedTabTextColor;
mTextPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
mTextPaint.setTextAlign(Paint.Align.LEFT);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
PorterDuffXfermode mode = new PorterDuffXfermode(PorterDuff.Mode.SRC_IN); //取两层绘制交集,显示上层。
mPaint.setXfermode(mode);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
setMeasuredDimension(widthSize, heightSize);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
resetting();
Bitmap srcBitmap = Bitmap.createBitmap(getMeasuredWidth(), getMeasuredHeight(), Bitmap.Config.ARGB_8888);
Canvas srcCanvas = new Canvas(srcBitmap);
RectF rectF;
//文字随指示器位置进行颜色变化
if (level == 10000 || level == 0) {
rectF = new RectF(0, 0, 0, 0);
}else if (level == 5000) {
rectF = new RectF(0, 0, getMeasuredWidth(), getMeasuredHeight());
}else{
float value = (level / 5000f) - 1f;
if(value > 0){
rectF = new RectF(0, getMeasuredHeight() * value + indicatorPadding, getMeasuredWidth(), getMeasuredHeight());
}else{
rectF = new RectF(0, 0, getMeasuredWidth(), getMeasuredHeight() * (1 - Math.abs(value)) - indicatorPadding);
}
}
srcCanvas.save(); //为了保存之前的画布状态
srcCanvas.translate(0, (getMeasuredHeight() - mStaticLayout.getHeight()) / 2);
mStaticLayout.draw(srcCanvas);
srcCanvas.restore(); //把当前画布返回到上一个save()状态之前，重置平移部分。
mPaint.setColor(selectedTabTextColor);
srcCanvas.drawRect(rectF, mPaint);
canvas.drawBitmap(srcBitmap, 0, 0, null);
}
private void resetting(){
float size;
//字体随滑动变化
if (level == 5000) {
size = textSize * 1.1f;
}else if(level == 10000 || level == 0){
size = textSize * 1f;
}else{
float value = (level / 5000f) - 1f;
size = textSize + textSize * (1 - Math.abs(value))* 0.1f;
}
mTextPaint.setTextSize(size);
mTextPaint.setColor(defaultTabTextColor);
int num = (getMeasuredWidth() - indicatorPadding) / (int) size; // 一行可以放下的字数，默认放置两行文字
// mStaticLayout = new StaticLayout(text, mTextPaint, getMeasuredWidth() - indicatorPadding, Layout.Alignment.ALIGN_NORMAL, 1.0F, 0.0F, false);
mStaticLayout = new StaticLayout(text, 0, text.length() > num * 2 ? num * 2 : text.length(), mTextPaint, getMeasuredWidth() - indicatorPadding,
Layout.Alignment.ALIGN_NORMAL, 1.0F, 0.0F, false);
}
void setLevel(int level){
this.level = level;
invalidate();
}
void setText(String text){
this.text = text;
invalidate();
}
/**
* 设置指示器上下内边距
* @param indicatorPadding 指示器上下内边距
*/
void setIndicatorPadding(int indicatorPadding){
this.indicatorPadding = indicatorPadding;
invalidate();
}
/**
* 设置默认文字颜色
* @param defaultTabTextColor 默认文字颜色
*/
void setDefaultTabTextColor(int defaultTabTextColor){
this.defaultTabTextColor = defaultTabTextColor;
invalidate();
}
/**
* 设置选中文字颜色
* @param selectedTabTextColor 选中文字颜色
*/
void setSelectedTabTextColor(int selectedTabTextColor){
this.selectedTabTextColor = selectedTabTextColor;
invalidate();
}
/**
* 设置文字大小
* @param textSize 文字大小
*/
void setTabViewTextSize(float textSize){
this.textSize = textSize;
invalidate();
}
}
