/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2015 Umeng, Inc
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.umeng.comm.ui.widgets;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.CornerPathEffect;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.WindowManager;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.umeng.comm.core.utils.ResFinder;
public class ViewPagerIndicator extends LinearLayout {
/**
* 绘制三角形的画笔
*/
private Paint mPaint;
private Paint mLinePaint;
/**
* path构成一个三角形
*/
private Path mPath;
private Paint mDividerLinePaint;
/**
* 三角形的宽度
*/
private int mTriangleWidth;
/**
* 三角形的高度
*/
private int mTriangleHeight;
/**
* 三角形的宽度为单个Tab的1/6
*/
private static final float RADIO_TRIANGEL = 1.0f / 6;
/**
* 三角形的最大宽度
*/
private final int DIMENSION_TRIANGEL_WIDTH = (int) (getScreenWidth() / 3 * RADIO_TRIANGEL);
/**
* 初始时，三角形指示器的偏移量
*/
private int mInitTranslationX;
/**
* 手指滑动时的偏移量
*/
private float mTranslationX;
/**
* 默认的Tab数量
*/
private static final int COUNT_DEFAULT_TAB = 2;
/**
* tab数量
*/
private int mTabVisibleCount = COUNT_DEFAULT_TAB;
/**
* tab上的内容
*/
private String[] mTabTitles;
/**
* 与之绑定的ViewPager
*/
public ViewPager mViewPager;
private int mHalfScreenWidth = 0;
/**
* 标题正常时的颜色
*/
private static final int COLOR_TEXT_NORMAL = ResFinder
.getColor("umeng_comm_text_default_color");
/**
* 标题选中时的颜色
*/
private static final int COLOR_TEXT_HIGHLIGHTCOLOR = ResFinder
.getColor("umeng_comm_text_topic_light_color");
public ViewPagerIndicator(Context context) {
this(context, null);
}
public ViewPagerIndicator(Context context, AttributeSet attrs) {
super(context, attrs);
// 初始化画笔
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setColor(COLOR_TEXT_HIGHLIGHTCOLOR);
mPaint.setStyle(Style.FILL);
mPaint.setPathEffect(new CornerPathEffect(3));
mLinePaint = new Paint();
mLinePaint.setAntiAlias(true);
mLinePaint.setColor(COLOR_TEXT_HIGHLIGHTCOLOR);
mLinePaint.setStyle(Style.FILL);
mLinePaint.setStrokeWidth(10);
mDividerLinePaint = new Paint();
mDividerLinePaint.setAntiAlias(true);
mDividerLinePaint.setColor(COLOR_TEXT_HIGHLIGHTCOLOR);
mDividerLinePaint.setStyle(Style.FILL);
mDividerLinePaint.setStrokeWidth(5);
}
/**
* 绘制指示器
*/
@Override
protected void dispatchDraw(Canvas canvas) {
canvas.save();
// 画笔平移到正确的位置
canvas.translate(mInitTranslationX + mTranslationX, getHeight() + 5);
canvas.drawPath(mPath, mPaint);
canvas.restore();
// 绘制tab的下划线
canvas.drawLine(mTranslationX, getHeight() - 3, mTranslationX
+ mHalfScreenWidth, getHeight() - 3, mLinePaint);
// 绘制一行的分割线
canvas.drawLine(0, getHeight() - 1, 2 * mHalfScreenWidth, getHeight() - 1,
mDividerLinePaint);
super.dispatchDraw(canvas);
}
/**
* 初始化三角形的宽度
*/
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mTriangleWidth = (int) (w / mTabVisibleCount * RADIO_TRIANGEL);// 1/6 of
// width
mTriangleWidth = Math.min(DIMENSION_TRIANGEL_WIDTH, mTriangleWidth);
// 初始化三角形
initTriangle();
// 初始时的偏移量
mInitTranslationX = getWidth() / mTabVisibleCount / 2 - mTriangleWidth
/ 2;
}
/**
* 设置可见的tab的数量
*
* @param count
*/
public void setVisibleTabCount(int count) {
this.mTabVisibleCount = count;
}
/**
* 设置tab的标题内容 可选，可以自己在布局文件中写死
*
* @param datas
*/
public void setTabItemTitles(String[] datas) {
// 如果传入的list有值，则移除布局文件中设置的view
if (datas != null && datas.length > 0) {
this.removeAllViews();
this.mTabTitles = datas;
for (String title : mTabTitles) {
// 添加view
addView(generateTextView(title));
}
// 设置item的click事件
setItemClickEvent();
mHalfScreenWidth = getScreenWidth() / 2;
}
}
/**
* 对外的ViewPager的回调接口
*
* @author zhy
*/
public interface PageChangeListener {
public void onPageScrolled(int position, float positionOffset,
int positionOffsetPixels);
public void onPageSelected(int position);
public 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;
}
// 设置关联的ViewPager
public void setViewPager(ViewPager mViewPager, int pos) {
this.mViewPager = mViewPager;
mViewPager.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
// 设置字体颜色高亮
resetTextViewColor();
highLightTextView(position);
// 回调
if (onPageChangeListener != null) {
onPageChangeListener.onPageSelected(position);
}
}
@Override
public void onPageScrolled(int position, float positionOffset,
int positionOffsetPixels) {
// 滚动
scroll(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);
// 高亮
highLightTextView(pos);
}
/**
* 高亮文本
*
* @param position
*/
protected void highLightTextView(int position) {
View view = getChildAt(position);
if (view instanceof TextView) {
((TextView) view).setTextColor(COLOR_TEXT_HIGHLIGHTCOLOR);
}
}
/**
* 重置文本颜色
*/
private void resetTextViewColor() {
for (int i = 0; i < getChildCount(); i++) {
View view = getChildAt(i);
if (view instanceof TextView) {
((TextView) view).setTextColor(COLOR_TEXT_NORMAL);
}
}
}
/**
* 设置点击事件
*/
public 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);
}
});
}
}
/**
* 根据标题生成我们的TextView
*
* @param text
* @return
*/
private TextView generateTextView(String text) {
TextView tv = new TextView(getContext());
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
lp.width = getScreenWidth() / mTabVisibleCount;
tv.setGravity(Gravity.CENTER);
tv.setTextColor(COLOR_TEXT_NORMAL);
tv.setText(text);
tv.setTextSize(TypedValue.COMPLEX_UNIT_SP, 18);
tv.setLayoutParams(lp);
return tv;
}
/**
* 初始化三角形指示器
*/
private void initTriangle() {
mPath = new Path();
mTriangleHeight = (int) (mTriangleWidth * Math.sqrt(3) / 4); // 等边三角形
mPath.moveTo(0, 0);
mPath.lineTo(mTriangleWidth, 0);
mPath.lineTo(mTriangleWidth / 2, -mTriangleHeight);
mPath.close();
}
/**
* 指示器跟随手指滚动，以及容器滚动
*
* @param position
* @param offset
*/
public void scroll(int position, float offset) {
/**
* <pre>
* 0-1:position=0 ;1-0:postion=0;
* </pre>
*/
// 不断改变偏移量，invalidate
mTranslationX = getWidth() / mTabVisibleCount * (position + offset);
int tabWidth = getScreenWidth() / mTabVisibleCount;
// 容器滚动，当移动到倒数最后一个的时候，开始滚动
if (offset > 0 && position >= (mTabVisibleCount - 2)
&& getChildCount() > mTabVisibleCount) {
if (mTabVisibleCount != 1) {
this.scrollTo((position - (mTabVisibleCount - 2)) * tabWidth
+ (int) (tabWidth * offset), 0);
} else {
// 为count为1时 的特殊处理
this.scrollTo(position * tabWidth + (int) (tabWidth * offset), 0);
}
}
invalidate();
}
/**
* 设置布局中view的一些必要属性；如果设置了setTabTitles，布局中view则无效
*/
@Override
protected void onFinishInflate() {
Log.e("TAG", "onFinishInflate");
super.onFinishInflate();
int cCount = getChildCount();
if (cCount == 0)
return;
for (int i = 0; i < cCount; i++) {
View view = getChildAt(i);
LinearLayout.LayoutParams lp = (LayoutParams) view
.getLayoutParams();
lp.weight = 0;
lp.width = getScreenWidth() / mTabVisibleCount;
view.setLayoutParams(lp);
}
// 设置点击事件
setItemClickEvent();
}
/**
* 获得屏幕的宽度
*
* @return
*/
public int getScreenWidth() {
WindowManager wm = (WindowManager) getContext().getSystemService(
Context.WINDOW_SERVICE);
DisplayMetrics outMetrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(outMetrics);
return outMetrics.widthPixels;
}
}