wm.xmwei.ui.view.indicator.PagerSlidingTabIndicator.java Source code

Java tutorial

Introduction

Here is the source code for wm.xmwei.ui.view.indicator.PagerSlidingTabIndicator.java

Source

/*
 * Copyright (C) 2013 Andreas Stuetz <andreas.stuetz@gmail.com>
 *
 * 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 wm.xmwei.ui.view.indicator;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.graphics.Typeface;
import android.os.Build;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.widget.HorizontalScrollView;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.math.BigDecimal;
import java.util.Locale;

import wm.xmwei.R;

public class PagerSlidingTabIndicator extends HorizontalScrollView {

    public interface IconTabProvider {
        public int getPageIconResId(int position);
    }

    //@formatter:off
    private static final int[] ATTRS = new int[] { android.R.attr.textSize, android.R.attr.textColor };
    //@formatter:on
    private LinearLayout.LayoutParams defaultTabLayoutParams;
    private LinearLayout.LayoutParams expandedTabLayoutParams;
    private final PageListener pageListener = new PageListener();
    public OnPageChangeListener delegatePageListener;
    private LinearLayout tabsContainer;
    private ViewPager pager;
    private Context mContext;
    private int tabCount;

    private int currentPosition = 0;
    private float currentPositionOffset = 0f;

    private Paint rectPaint;
    private Paint bgPaint;
    private Paint dividerPaint;

    private int indicatorColor = 0x00000000;
    private int underlineColor = 0x00000000;
    private int dividerColor = 0x1A000000;

    private boolean shouldExpand = false;
    private boolean textAllCaps = true;

    private int scrollOffset = 52;
    private int indicatorHeight = 8;
    private int underlineHeight = 2;
    private int dividerPadding = 12;
    private int tabPadding = 24;
    private int dividerWidth = 0;
    private int lastPosition = -1;

    private int tabTextSize = 12;
    private int tabTextColor = 0xFF5f5f5f;
    private Typeface tabTypeface = null;
    private int tabTypefaceStyle = Typeface.BOLD;
    private int lastScrollX = 0;
    private boolean textChangeSizeOnScroll = false;
    private int tabSelectedTextSize; // textViewSize?
    //private int tabBackgroundResId = R.drawable.background_tab;
    private int tabBackgroundResId = R.drawable.background_tab;

    private Locale locale;

    public PagerSlidingTabIndicator(Context context) {
        this(context, null);
    }

    public PagerSlidingTabIndicator(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public PagerSlidingTabIndicator(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        setFillViewport(true);//???.
        setWillNotDraw(false);

        tabsContainer = new LinearLayout(context);
        tabsContainer.setOrientation(LinearLayout.HORIZONTAL);
        tabsContainer.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
        addView(tabsContainer);

        DisplayMetrics dm = getResources().getDisplayMetrics();

        scrollOffset = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, scrollOffset, dm);
        indicatorHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, indicatorHeight, dm);
        underlineHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, underlineHeight, dm);
        dividerPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerPadding, dm);
        tabPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, tabPadding, dm);
        dividerWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerWidth, dm);
        tabTextSize = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, tabTextSize, dm);

        // get system attrs (android:textSize and android:textColor)

        TypedArray a = context.obtainStyledAttributes(attrs, ATTRS);

        tabTextSize = a.getDimensionPixelSize(0, tabTextSize);
        tabTextColor = a.getColor(1, tabTextColor);
        tabSelectedTextSize = tabTextSize + 2; // ?? + 4px

        a.recycle();

        // get custom attrs

        a = context.obtainStyledAttributes(attrs, R.styleable.PageSlidingIndicator);

        indicatorColor = a.getColor(R.styleable.PageSlidingIndicator_indicatorColor, indicatorColor);
        underlineColor = a.getColor(R.styleable.PageSlidingIndicator_underlineColor, underlineColor);
        dividerColor = a.getColor(R.styleable.PageSlidingIndicator_dividerColor, dividerColor);
        indicatorHeight = a.getDimensionPixelSize(R.styleable.PageSlidingIndicator_indicatorHeight,
                indicatorHeight);
        underlineHeight = a.getDimensionPixelSize(R.styleable.PageSlidingIndicator_underlineHeight,
                underlineHeight);
        dividerPadding = a.getDimensionPixelSize(R.styleable.PageSlidingIndicator_indicatorDividerPadding,
                dividerPadding);
        tabPadding = a.getDimensionPixelSize(R.styleable.PageSlidingIndicator_tabPaddingLeftRight, tabPadding);
        tabBackgroundResId = a.getResourceId(R.styleable.PageSlidingIndicator_tabBackground, tabBackgroundResId);
        shouldExpand = a.getBoolean(R.styleable.PageSlidingIndicator_shouldExpand, shouldExpand);
        scrollOffset = a.getDimensionPixelSize(R.styleable.PageSlidingIndicator_scrollOffset, scrollOffset);
        textAllCaps = a.getBoolean(R.styleable.PageSlidingIndicator_indicatorTextAllCaps, textAllCaps);
        textChangeSizeOnScroll = a.getBoolean(R.styleable.PageSlidingIndicator_isChangeTextSizeBig,
                textChangeSizeOnScroll);

        a.recycle();

        rectPaint = new Paint();
        rectPaint.setColor(Color.TRANSPARENT);
        rectPaint.setAntiAlias(true);
        rectPaint.setStyle(Style.FILL);

        bgPaint = new Paint();
        bgPaint.setColor(Color.WHITE);
        bgPaint.setAntiAlias(true);
        bgPaint.setStyle(Style.FILL);

        /*dividerPaint = new Paint();
          dividerPaint.setAntiAlias(true);
        dividerPaint.setStrokeWidth(dividerWidth);*/

        defaultTabLayoutParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,
                LayoutParams.MATCH_PARENT);
        expandedTabLayoutParams = new LinearLayout.LayoutParams(0, LayoutParams.MATCH_PARENT, 1.0f);

        if (locale == null) {
            locale = getResources().getConfiguration().locale;
        }
    }

    public void setViewPager(ViewPager pager) {
        this.pager = pager;
        if (pager.getAdapter() == null) {
            throw new IllegalStateException("ViewPager does not have adapter instance.");
        }

        pager.setOnPageChangeListener(pageListener);

        notifyDataSetChanged();
    }

    private void setDefaultStatus() {

        setTextStatus(pager.getCurrentItem());
    }

    public void setOnPageChangeListener(OnPageChangeListener listener) {
        this.delegatePageListener = listener;
    }

    public void notifyDataSetChanged() {

        tabsContainer.removeAllViews();

        tabCount = pager.getAdapter().getCount();

        for (int i = 0; i < tabCount; i++) {

            if (pager.getAdapter() instanceof IconTabProvider) {
                addIconTab(i, ((IconTabProvider) pager.getAdapter()).getPageIconResId(i));
            } else {
                addTextTab(i, pager.getAdapter().getPageTitle(i).toString());
            }

        }

        updateTabStyles();
        setDefaultStatus();
        getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

            @SuppressWarnings("deprecation")
            @Override
            public void onGlobalLayout() {

                if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
                    getViewTreeObserver().removeGlobalOnLayoutListener(this);
                } else {
                    getViewTreeObserver().removeOnGlobalLayoutListener(this);
                }

                currentPosition = pager.getCurrentItem();
                scrollToChild(currentPosition, 0);
            }
        });

    }

    private void addTextTab(final int position, String title) {

        TextView tab = new TextView(getContext());
        tab.setText(title);
        tab.setGravity(Gravity.CENTER);
        tab.setSingleLine();

        addTab(position, tab);
    }

    private void addIconTab(final int position, int resId) {

        ImageButton tab = new ImageButton(getContext());
        tab.setImageResource(resId);

        addTab(position, tab);

    }

    private void setTextStatus(int position) {
        if (position != lastPosition) {
            if (lastPosition != -1) {
                setTabTextColor(lastPosition, false);
            }

            setTabTextColor(position, true);
            lastPosition = position;
        }

    }

    private void addTab(final int position, View tab) {
        tab.setFocusable(true);
        tab.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                pager.setCurrentItem(position, true);

            }
        });

        tab.setPadding(tabPadding, 0, tabPadding, 0);
        tabsContainer.addView(tab, position, shouldExpand ? expandedTabLayoutParams : defaultTabLayoutParams);
    }

    private void updateTabStyles() {

        for (int i = 0; i < tabCount; i++) {

            View v = tabsContainer.getChildAt(i);

            //v.setBackgroundResource(tabBackgroundResId);

            if (v instanceof TextView) {

                TextView tab = (TextView) v;
                tab.setTextSize(TypedValue.COMPLEX_UNIT_PX, tabTextSize);
                tab.setTypeface(tabTypeface, tabTypefaceStyle);
                tab.setTextColor(tabTextColor);

                // setAllCaps() is only available from API 14, so the upper case is made manually if we are on a
                // pre-ICS-build
                if (textAllCaps) {
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
                        tab.setAllCaps(true);
                    } else {
                        tab.setText(tab.getText().toString().toUpperCase(locale));
                    }
                }
            }
        }

    }

    private void scrollToChild(int position, int offset) {

        if (tabCount == 0) {
            return;
        }

        int newScrollX = tabsContainer.getChildAt(position).getLeft() + offset;

        if (position > 0 || offset > 0) {
            newScrollX -= scrollOffset;
        }

        if (newScrollX != lastScrollX) {
            lastScrollX = newScrollX;
            //scrollTo(newScrollX, 0);
            smoothScrollTo(newScrollX, 0);
        }

    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        if (isInEditMode() || tabCount == 0) {
            return;
        }

        final int height = getHeight();
        final int width = getWidth();

        // draw indicator line

        //rectPaint.setColor(indicatorColor);

        // default: line below current tab
        View currentTab = tabsContainer.getChildAt(currentPosition);
        float lineLeft = currentTab.getLeft();
        float lineRight = currentTab.getRight();

        // if there is an offset, start interpolating left and right coordinates between current and next tab
        if (currentPositionOffset > 0f && currentPosition < tabCount - 1) {

            View nextTab = tabsContainer.getChildAt(currentPosition + 1);
            nextTab.setBackgroundResource(Color.TRANSPARENT);
            final float nextTabLeft = nextTab.getLeft();
            final float nextTabRight = nextTab.getRight();

            lineLeft = (currentPositionOffset * nextTabLeft + (1f - currentPositionOffset) * lineLeft);
            lineRight = (currentPositionOffset * nextTabRight + (1f - currentPositionOffset) * lineRight);
        }

        /*   canvas.drawRect(lineLeft, height - indicatorHeight, lineRight, height, rectPaint);*/

        float center = (lineLeft + lineRight) / 2;

        // ,??  
        // Path path = new Path();
        //path.moveTo(center,height - indicatorHeight);//   

        BigDecimal a = BigDecimal.valueOf(1.736);
        BigDecimal b = BigDecimal.valueOf(3);
        BigDecimal bigDecimal = a.divide(b, BigDecimal.ROUND_HALF_UP);
        float result = bigDecimal.floatValue() * indicatorHeight;

        //path.lineTo(center-result-2, height);  
        // path.lineTo(center+result+2, height);
        //path.close(); // ??  
        // canvas.drawPath(path, rectPaint);

        Path path2 = new Path();
        path2.moveTo(0, 0);//   
        path2.lineTo(0, height);
        path2.lineTo(center - result - 5, height);
        path2.lineTo(center, height - indicatorHeight);
        path2.lineTo(center + result + 5, height);
        path2.lineTo(tabsContainer.getWidth(), height);
        path2.lineTo(tabsContainer.getWidth(), 0);

        path2.close(); // ??  
        canvas.drawPath(path2, bgPaint);
        // draw underline

        /*rectPaint.setColor(underlineColor);
        canvas.drawRect(0, height - underlineHeight, tabsContainer.getWidth(), height, rectPaint);*/

        // draw divider

        /*   dividerPaint.setColor(dividerColor);
           for (int i = 0; i < tabCount - 1; i++) {
              View tab = tabsContainer.getChildAt(i);
              canvas.drawLine(tab.getRight(), dividerPadding, tab.getRight(), height - dividerPadding, dividerPaint);
           }*/
    }

    private class PageListener implements OnPageChangeListener {

        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            currentPosition = position;
            currentPositionOffset = positionOffset;

            scrollToChild(position, (int) (positionOffset * tabsContainer.getChildAt(position).getWidth()));

            invalidate();

            if (delegatePageListener != null) {
                delegatePageListener.onPageScrolled(position, positionOffset, positionOffsetPixels);
            }
        }

        @Override
        public void onPageScrollStateChanged(int state) {
            if (state == ViewPager.SCROLL_STATE_IDLE) {
                scrollToChild(pager.getCurrentItem(), 0);
            }

            if (delegatePageListener != null) {
                delegatePageListener.onPageScrollStateChanged(state);
            }
        }

        @Override
        public void onPageSelected(int position) {
            setTextStatus(position);

            if (delegatePageListener != null) {
                delegatePageListener.onPageSelected(position);
            }
            /*    View v = mAdapter.getItem(position).getView();
                   
                    // ImageView ivTitle = (ImageView) v.findViewById(R.id.tour_title);
                
                     Animation fadeInAnimation = AnimationUtils.loadAnimation(mContext, R.anim.fade_in);
                     v.startAnimation(fadeInAnimation );*/
        }

    }

    public void setIndicatorColor(int indicatorColor) {
        this.indicatorColor = indicatorColor;
        invalidate();
    }

    public void setIndicatorColorResource(int resId) {
        this.indicatorColor = getResources().getColor(resId);
        invalidate();
    }

    public int getIndicatorColor() {
        return this.indicatorColor;
    }

    public void setIndicatorHeight(int indicatorLineHeightPx) {
        this.indicatorHeight = indicatorLineHeightPx;
        invalidate();
    }

    public int getIndicatorHeight() {
        return indicatorHeight;
    }

    public void setUnderlineColor(int underlineColor) {
        this.underlineColor = underlineColor;
        invalidate();
    }

    public void setUnderlineColorResource(int resId) {
        this.underlineColor = getResources().getColor(resId);
        invalidate();
    }

    public int getUnderlineColor() {
        return underlineColor;
    }

    public void setDividerColor(int dividerColor) {
        this.dividerColor = dividerColor;
        invalidate();
    }

    public void setDividerColorResource(int resId) {
        this.dividerColor = getResources().getColor(resId);
        invalidate();
    }

    public int getDividerColor() {
        return dividerColor;
    }

    public void setUnderlineHeight(int underlineHeightPx) {
        this.underlineHeight = underlineHeightPx;
        invalidate();
    }

    public int getUnderlineHeight() {
        return underlineHeight;
    }

    public void setDividerPadding(int dividerPaddingPx) {
        this.dividerPadding = dividerPaddingPx;
        invalidate();
    }

    public int getDividerPadding() {
        return dividerPadding;
    }

    public void setScrollOffset(int scrollOffsetPx) {
        this.scrollOffset = scrollOffsetPx;
        invalidate();
    }

    public int getScrollOffset() {
        return scrollOffset;
    }

    public void setShouldExpand(boolean shouldExpand) {
        this.shouldExpand = shouldExpand;
        requestLayout();
    }

    public boolean getShouldExpand() {
        return shouldExpand;
    }

    public boolean isTextAllCaps() {
        return textAllCaps;
    }

    public void setAllCaps(boolean textAllCaps) {
        this.textAllCaps = textAllCaps;
    }

    public void setTextSize(int textSizePx) {
        this.tabTextSize = textSizePx;
        updateTabStyles();
    }

    public int getTextSize() {
        return tabTextSize;
    }

    public void setTextColor(int textColor) {
        this.tabTextColor = textColor;
        updateTabStyles();
    }

    public void setTextColorResource(int resId) {
        this.tabTextColor = getResources().getColor(resId);
        updateTabStyles();
    }

    public int getTextColor() {
        return tabTextColor;
    }

    public void setTypeface(Typeface typeface, int style) {
        this.tabTypeface = typeface;
        this.tabTypefaceStyle = style;
        updateTabStyles();
    }

    private void setTabTextColor(int position, boolean isSelect) {
        TextView selectView = ((TextView) tabsContainer.getChildAt(position));
        if (isSelect) {
            selectView.setTextColor(getResources().getColor(R.color.v_title_bg));
            if (textChangeSizeOnScroll) {
                selectView.setTextSize(TypedValue.COMPLEX_UNIT_PX, tabSelectedTextSize);
            }
        } else {
            selectView.setTextColor(getResources().getColor(R.color.tabblack));
            if (textChangeSizeOnScroll) {
                selectView.setTextSize(TypedValue.COMPLEX_UNIT_PX, tabTextSize);
            }
        }

    }

    public void setTabBackground(int resId) {
        //   this.tabBackgroundResId = resId;
    }

    public int getTabBackground() {
        return 0;
        //return tabBackgroundResId;
    }

    public void setTabPaddingLeftRight(int paddingPx) {
        this.tabPadding = paddingPx;
        updateTabStyles();
    }

    public int getTabPaddingLeftRight() {
        return tabPadding;
    }

    @Override
    public void onRestoreInstanceState(Parcelable state) {
        SavedState savedState = (SavedState) state;
        super.onRestoreInstanceState(savedState.getSuperState());
        currentPosition = savedState.currentPosition;
        requestLayout();
    }

    @Override
    public Parcelable onSaveInstanceState() {
        Parcelable superState = super.onSaveInstanceState();
        SavedState savedState = new SavedState(superState);
        savedState.currentPosition = currentPosition;
        return savedState;
    }

    static class SavedState extends BaseSavedState {
        int currentPosition;

        public SavedState(Parcelable superState) {
            super(superState);
        }

        private SavedState(Parcel in) {
            super(in);
            currentPosition = in.readInt();
        }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            super.writeToParcel(dest, flags);
            dest.writeInt(currentPosition);
        }

        public static final Creator<SavedState> CREATOR = new Creator<SavedState>() {
            @Override
            public SavedState createFromParcel(Parcel in) {
                return new SavedState(in);
            }

            @Override
            public SavedState[] newArray(int size) {
                return new SavedState[size];
            }
        };
    }

}