/**
* Copyright 2016 JustWayward Team
* <p>
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.justwayward.reader.view;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.NinePatchDrawable;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.justwayward.reader.R;
import java.util.List;
/**
* Created by Administrator on 2016/8/4.
*/
public class RVPIndicator extends LinearLayout {
// 指示器风格-图标
private static final int STYLE_BITMAP = 0;
// 指示器风格-下划线
private static final int STYLE_LINE = 1;
// 指示器风格-方形背景
private static final int STYLE_SQUARE = 2;
// 指示器风格-三角形
private static final int STYLE_TRIANGLE = 3;
/*
* 系统默认:Tab数量
*/
private static final int D_TAB_COUNT = 3;
/*
* 系统默认:文字正常时颜色
*/
private static final int D_TEXT_COLOR_NORMAL = Color.parseColor("#000000");
/*
* 系统默认:文字选中时颜色
*/
private static final int D_TEXT_COLOR_HIGHLIGHT = Color
.parseColor("#FF0000");
/*
* 系统默认:指示器颜色
*/
private static final int D_INDICATOR_COLOR = Color.parseColor("#f29b76");
/**
* tab上的内容
*/
private List<String> mTabTitles;
/**
* 可见tab数量
*/
private int mTabVisibleCount = D_TAB_COUNT;
/**
* 与之绑定的ViewPager
*/
public ViewPager mViewPager;
/**
* 文字大小
*/
private int mTextSize = 16;
/**
* 文字正常时的颜色
*/
private int mTextColorNormal = D_TEXT_COLOR_NORMAL;
/**
* 文字选中时的颜色
*/
private int mTextColorHighlight = D_TEXT_COLOR_HIGHLIGHT;
/**
* 指示器正常时的颜色
*/
private int mIndicatorColor = D_INDICATOR_COLOR;
/**
* 画笔
*/
private Paint mPaint;
/**
* 矩形
*/
private Rect mRectF;
/**
* bitmap
*/
private Bitmap mBitmap;
/**
* 指示器高
*/
private int mIndicatorHeight = 5;
/**
* 指示器宽
*/
private int mIndicatorWidth = getWidth() / mTabVisibleCount;
/**
* 三角形的宽度为单个Tab的1/6
*/
private static final float RADIO_TRIANGEL = 1.0f / 6;
/**
* 手指滑动时的偏移量
*/
private float mTranslationX;
/**
* 指示器风格
*/
private int mIndicatorStyle = STYLE_LINE;
/**
* 曲线path
*/
private Path mPath;
/**
* viewPage初始下标
*/
private int mPosition = 0;
public RVPIndicator(Context context) {
this(context, null);
}
public RVPIndicator(Context context, AttributeSet attrs) {
super(context, attrs);
// 获得自定义属性
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.RVPIndicator);
mTabVisibleCount = a.getInt(R.styleable.RVPIndicator_item_count,
D_TAB_COUNT);
mTextColorNormal = a
.getColor(R.styleable.RVPIndicator_text_color_normal,
D_TEXT_COLOR_NORMAL);
mTextColorHighlight = a.getColor(
R.styleable.RVPIndicator_text_color_hightlight,
D_TEXT_COLOR_HIGHLIGHT);
mTextSize = a.getDimensionPixelSize(R.styleable.RVPIndicator_text_size,
16);
mIndicatorColor = a.getColor(R.styleable.RVPIndicator_indicator_color,
D_INDICATOR_COLOR);
mIndicatorStyle = a.getInt(R.styleable.RVPIndicator_indicator_style,
STYLE_LINE);
Drawable drawable = a
.getDrawable(R.styleable.RVPIndicator_indicator_src);
if (drawable != null) {
if (drawable instanceof BitmapDrawable) {
mBitmap = ((BitmapDrawable) drawable).getBitmap();
} else if (drawable instanceof NinePatchDrawable) {
// .9图处理
Bitmap bitmap = Bitmap.createBitmap(
drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
mBitmap = bitmap;
}
} else {
mBitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.heart_love);
}
a.recycle();
/**
* 设置画笔
*/
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setColor(mIndicatorColor);
mPaint.setStyle(Style.FILL);
}
/**
* 初始化指示器
*/
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
switch (mIndicatorStyle) {
case STYLE_LINE:
/*
* 下划线指示器:宽与item相等,高是item的1/10
*/
mIndicatorWidth = w / mTabVisibleCount;
mIndicatorHeight = h / 10;
mTranslationX = 0;
mRectF = new Rect(0, 0, mIndicatorWidth, mIndicatorHeight);
break;
case STYLE_SQUARE:
case STYLE_BITMAP:
/*
* 方形/图标指示器:宽,高与item相等
*/
mIndicatorWidth = w / mTabVisibleCount;
mIndicatorHeight = h;
mTranslationX = 0;
mRectF = new Rect(0, 0, mIndicatorWidth, mIndicatorHeight);
break;
case STYLE_TRIANGLE:
/*
* 三角形指示器:宽与item(1/4)相等,高是item的1/4
*/
//mIndicatorWidth = w / mTabVisibleCount / 4;
// mIndicatorHeight = h / 4;
mIndicatorWidth = (int) (w / mTabVisibleCount * RADIO_TRIANGEL);// 1/6 of width ;
mIndicatorHeight = (int) (mIndicatorWidth / 2 / Math.sqrt(2));
mTranslationX = 0;
break;
}
// 初始化tabItem
initTabItem();
// 高亮
setHighLightTextView(mPosition);
}
/**
* 绘制指示器(子view)
*/
@Override
protected void dispatchDraw(Canvas canvas) {
// 保存画布
canvas.save();
switch (mIndicatorStyle) {
case STYLE_BITMAP:
canvas.translate(mTranslationX, 0);
canvas.drawBitmap(mBitmap, null, mRectF, mPaint);
break;
case STYLE_LINE:
canvas.translate(mTranslationX, getHeight() - mIndicatorHeight);
canvas.drawRect(mRectF, mPaint);
break;
case STYLE_SQUARE:
canvas.translate(mTranslationX, 0);
canvas.drawRect(mRectF, mPaint);
break;
case STYLE_TRIANGLE:
canvas.translate(mTranslationX, 0);
// 笔锋圆滑度
// mPaint.setPathEffect(new CornerPathEffect(10));
mPath = new Path();
int midOfTab = getWidth() / mTabVisibleCount / 2;
mPath.moveTo(midOfTab, getHeight() - mIndicatorHeight);
mPath.lineTo(midOfTab - mIndicatorWidth / 2, getHeight());
mPath.lineTo(midOfTab + mIndicatorWidth / 2, getHeight());
mPath.close();
canvas.drawPath(mPath, mPaint);
break;
}
// 恢复画布
canvas.restore();
super.dispatchDraw(canvas);
}
/**
* 设置tab上的内容
*
* @param datas
*/
public void setTabItemTitles(List<String> datas) {
this.mTabTitles = datas;
}
/**
* 设置关联viewPager
*
* @param viewPager
* @param pos
*/
@SuppressWarnings("deprecation")
public void setViewPager(ViewPager viewPager, int pos) {
this.mViewPager = viewPager;
mViewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
// 设置文本高亮
setHighLightTextView(position);
// 回调
if (onPageChangeListener != null) {
onPageChangeListener.onPageSelected(position);
}
}
@Override
public void onPageScrolled(int position, float positionOffset,
int positionOffsetPixels) {
// scoll
onScoll(position, positionOffset);
// 回调
if (onPageChangeListener != null) {
onPageChangeListener.onPageScrolled(position,
positionOffset, positionOffsetPixels);
}
}
@Override
public void onPageScrollStateChanged(int state) {
// 回调
if (onPageChangeListener != null) {
onPageChangeListener.onPageScrollStateChanged(state);
}
}
});
// 设置当前页
mViewPager.setCurrentItem(pos);
mPosition = pos;
}
/**
*
* 初始化tabItem
*
* @author Ruffian
*/
private void initTabItem() {
if (mTabTitles != null && mTabTitles.size() > 0) {
if (this.getChildCount() != 0) {
this.removeAllViews();
}
for (String title : mTabTitles) {
addView(createTextView(title));
}
// 设置点击事件
setItemClickEvent();
}
}
/**
* 设置点击事件
*/
private void setItemClickEvent() {
int cCount = getChildCount();
for (int i = 0; i < cCount; i++) {
final int j = i;
View view = getChildAt(i);
view.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mViewPager.setCurrentItem(j);
}
});
}
}
/**
* 设置文本高亮
*
* @param position
*/
private void setHighLightTextView(int position) {
for (int i = 0; i < getChildCount(); i++) {
View view = getChildAt(i);
if (view instanceof TextView) {
if (i == position) {
((TextView) view).setTextColor(mTextColorHighlight);
} else {
((TextView) view).setTextColor(mTextColorNormal);
}
}
}
}
/**
* 滚动
*
* @param position
* @param offset
*/
private void onScoll(int position, float offset) {
// 不断改变偏移量，invalidate
mTranslationX = getWidth() / mTabVisibleCount * (position + offset);
int tabWidth = getWidth() / mTabVisibleCount;
// 容器滚动，当移动到倒数第二个的时候，开始滚动
if (offset > 0 && position >= (mTabVisibleCount - 2)
&& getChildCount() > mTabVisibleCount
&& position < (getChildCount() - 2)) {
if (mTabVisibleCount != 1) {
int xValue = (position - (mTabVisibleCount - 2)) * tabWidth
+ (int) (tabWidth * offset);
this.scrollTo(xValue, 0);
} else {
// 为count为1时 的特殊处理
this.scrollTo(position * tabWidth + (int) (tabWidth * offset),
0);
}
}
invalidate();
}
/**
* 创建标题view
*
* @param text
* @return
*/
private TextView createTextView(String text) {
TextView tv = new TextView(getContext());
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
lp.width = getWidth() / mTabVisibleCount;
tv.setGravity(Gravity.CENTER);
tv.setTextColor(mTextColorNormal);
tv.setText(text);
tv.setTextSize(TypedValue.COMPLEX_UNIT_SP, mTextSize);
tv.setLayoutParams(lp);
return tv;
}
/**
* 对外的ViewPager的回调接口
*
* @author Ruffian
*
*/
public interface PageChangeListener {
void onPageScrolled(int position, float positionOffset,
int positionOffsetPixels);
void onPageSelected(int position);
void onPageScrollStateChanged(int state);
}
// 对外的ViewPager的回调接口
private PageChangeListener onPageChangeListener;
// 对外的ViewPager的回调接口的设置
public void setOnPageChangeListener(PageChangeListener pageChangeListener) {
this.onPageChangeListener = pageChangeListener;
}
}