Java tutorial
/* * 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 com.fivetrue.workout.timer.view; import android.annotation.SuppressLint; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Typeface; import android.graphics.drawable.Drawable; 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.ViewGroup; import android.view.ViewTreeObserver.OnGlobalLayoutListener; import android.widget.HorizontalScrollView; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import com.fivetrue.workout.timer.R; import com.fivetrue.workout.timer.adapter.BasePagerAdapter; import java.util.List; import java.util.Locale; /** * Created by ojin.kwon on 2016-04-03. */ public class PagerSlidingTabStrip extends HorizontalScrollView { private static final String TAG = "PagerSlidingTabStrip"; public interface OnPageChangeCompleteListener { void onPageScrollStateChanged(int state); } public interface IconTabProvider { public int getPageIconResId(int position); } private LinearLayout.LayoutParams defaultTabLayoutParams; private LinearLayout.LayoutParams expandedTabLayoutParams; private final PageListener pageListener = new PageListener(); public OnPageChangeListener delegatePageListener; private LinearLayout tabsContainer; private ViewPager pager; private List<PagerTabContent> mTabContentList = null; public boolean isRefresh = false; private int currentPosition = 0; private float currentPositionOffset = 0f; private Paint mPaintIndicator = null; private Paint mPaintBackround = null; private boolean checkedTabWidths = false; private int indicatorColor = 0xFF3386ed; private boolean shouldExpand = false; private boolean textAllCaps = true; private boolean textOutline = false; private int scrollOffset = 52; private int indicatorHeight = 3; private int dividerMargin = 12; private int tabPadding = 10; private int tabIconPadding = 0; private int dividerWidth = 1; private int tabTextSize = 15; private int selectTextColor = Color.WHITE; private int tabTextColor = Color.WHITE; private Typeface tabTypeface = Typeface.SANS_SERIF; private int tabTypefaceStyle = Typeface.NORMAL; private int selectTabTypefaceStyle = Typeface.BOLD; private int lastScrollX = 0; private int tabBackgroundColor = Color.TRANSPARENT; private OnPageChangeCompleteListener onPageChangeCompleteListener = null; private Locale locale; public PagerSlidingTabStrip(Context context) { this(context, null); } public PagerSlidingTabStrip(Context context, AttributeSet attrs) { this(context, attrs, 0); } public PagerSlidingTabStrip(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); setFillViewport(true); setWillNotDraw(false); DisplayMetrics dm = getResources().getDisplayMetrics(); scrollOffset = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, scrollOffset, dm); indicatorHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, indicatorHeight, dm); dividerMargin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerMargin, dm); tabPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, tabPadding, dm); tabIconPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, tabIconPadding, dm); dividerWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerWidth, dm); tabTextSize = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, tabTextSize, dm); TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PagerSlidingTabStrip); indicatorColor = a.getColor(R.styleable.PagerSlidingTabStrip_indicatorColor, indicatorColor); indicatorHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_indicatorHeight, indicatorHeight); dividerMargin = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_dividerMargin, dividerMargin); tabPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_tabPadding, tabPadding); tabIconPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_tabIconPadding, tabIconPadding); tabBackgroundColor = a.getColor(R.styleable.PagerSlidingTabStrip_tabBackgroundColor, tabBackgroundColor); tabTextSize = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_tabTextSize, tabTextSize); tabTextColor = a.getColor(R.styleable.PagerSlidingTabStrip_tabTextColor, tabTextColor); selectTextColor = a.getColor(R.styleable.PagerSlidingTabStrip_selectedTabTextColor, selectTextColor); textAllCaps = a.getBoolean(R.styleable.PagerSlidingTabStrip_tabTextAllCaps, textAllCaps); textOutline = a.getBoolean(R.styleable.PagerSlidingTabStrip_tabTextOutline, textOutline); scrollOffset = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_scrollOffset, scrollOffset); shouldExpand = a.getBoolean(R.styleable.PagerSlidingTabStrip_shouldExpand, shouldExpand); a.recycle(); tabsContainer = new LinearLayout(context); tabsContainer.setOrientation(LinearLayout.HORIZONTAL); tabsContainer.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); addView(tabsContainer); mPaintIndicator = new Paint(); mPaintIndicator.setAntiAlias(true); mPaintIndicator.setColor(indicatorColor); mPaintIndicator.setStyle(Paint.Style.FILL); mPaintBackround = new Paint(); mPaintBackround.setAntiAlias(true); mPaintBackround.setColor(tabBackgroundColor); mPaintBackround.setStyle(Paint.Style.FILL); 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(); } public void setEnableItem(int position, boolean enabled) { if (position < 0 && position > mTabContentList.size()) return; tabsContainer.getChildAt(position).setEnabled(enabled); } /** * @return the tabsContainer */ public LinearLayout getTabsContainer() { return tabsContainer; } public TextView getTextViewAt(int position) { return (TextView) tabsContainer.getChildAt(position); } public void setOnPageChangeListener(OnPageChangeListener listener) { this.delegatePageListener = listener; } public void notifyDataSetChanged() { tabsContainer.removeAllViews(); if (pager != null && pager.getAdapter() != null && pager.getAdapter() instanceof BasePagerAdapter) { BasePagerAdapter adapter = (BasePagerAdapter) pager.getAdapter(); for (int i = 0; i < adapter.getCount(); i++) { if (adapter.getItem(i) instanceof PagerTabContent) { PagerTabContent content = (PagerTabContent) adapter.getItem(i); if (content.isShowingIcon()) { addIconTab(i, content.getTabDrawable(getContext())); } else { addTextTab(i, content.getTabTitle(getContext())); } } } updateTabStyles(); checkedTabWidths = false; getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() { @SuppressWarnings("deprecation") @SuppressLint("NewApi") @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); } }); } } class HoverTextView extends TextView { public HoverTextView(Context context) { super(context); } @Override protected void onDraw(Canvas canvas) { if (textOutline) { for (int i = 0; i < 5; i++) { super.onDraw(canvas); } } else { super.onDraw(canvas); } } } private void addTextTab(final int position, String title) { HoverTextView tab = new HoverTextView(getContext()); tab.setText(title); tab.setFocusable(true); tab.setGravity(Gravity.CENTER); tab.setSingleLine(); if (textOutline) { tab.setShadowLayer(5, 0, 0, Color.BLACK); } tab.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { pager.setCurrentItem(position); pager.setTag("click"); } }); tab.setSelected(currentPosition == position); tabsContainer.addView(tab); } private void addIconTab(final int position, Drawable drawable) { ImageView tab = new ImageView(getContext()); tab.setFocusable(true); tab.setImageDrawable(drawable); tab.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { pager.setCurrentItem(position); } }); tab.setSelected(currentPosition == position); LinearLayout.LayoutParams params = defaultTabLayoutParams; if (shouldExpand) { params = expandedTabLayoutParams; } tabsContainer.addView(tab, params); } private void updateTabStyles() { for (int i = 0; i < getCount(); i++) { View v = tabsContainer.getChildAt(i); v.setLayoutParams(defaultTabLayoutParams); // v.setBackgroundResource(tabBackgroundColor); if (shouldExpand) { v.setPadding(0, 0, 0, 0); } else { if (i == 0) { v.setPadding(tabPadding + tabPadding, 0, tabPadding, 0); } else { v.setPadding(tabPadding, 0, tabPadding, 0); } } if (v instanceof TextView) { TextView tab = (TextView) v; tab.setTextSize(TypedValue.COMPLEX_UNIT_PX, tabTextSize); tab.setTypeface(tabTypeface, tabTypefaceStyle); tab.setTextColor(tabTextColor); // tab.setMinWidth(tabMinWidth); // 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)); // } // } } else if (v instanceof ImageView && tabIconPadding > 0) { v.setPadding(tabIconPadding, tabIconPadding, tabIconPadding, tabIconPadding); } } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); if (!shouldExpand || MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.UNSPECIFIED) { return; } int myWidth = getMeasuredWidth(); int childWidth = 0; for (int i = 0; i < getCount(); i++) { childWidth += tabsContainer.getChildAt(i).getMeasuredWidth(); } if (!checkedTabWidths && childWidth > 0 && myWidth > 0) { if (childWidth <= myWidth) { for (int i = 0; i < getCount(); i++) { tabsContainer.getChildAt(i).setLayoutParams(expandedTabLayoutParams); } } checkedTabWidths = true; } } public int getCount() { int count = 0; if (pager != null && pager.getAdapter() != null) { count = pager.getAdapter().getCount(); } return count; } private void scrollToChild(int position, int offset) { if (getCount() == 0) { return; } int newScrollX = tabsContainer.getChildAt(position).getLeft() + offset; if (position > 0 || offset > 0) { newScrollX -= scrollOffset; } if (newScrollX != lastScrollX) { lastScrollX = newScrollX; scrollTo(newScrollX, 0); } } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); if (isInEditMode() || getCount() == 0) { return; } int height = getHeight(); // draw indicator line // 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 < getCount() - 1) { View nextTab = tabsContainer.getChildAt(currentPosition + 1); final float nextTabLeft = nextTab.getLeft(); final float nextTabRight = nextTab.getRight(); lineLeft = (currentPositionOffset * nextTabLeft + (1f - currentPositionOffset) * lineLeft); lineRight = (currentPositionOffset * nextTabRight + (1f - currentPositionOffset) * lineRight); } canvas.drawRect(0, 0, getWidth(), getHeight(), mPaintBackround); canvas.drawRect(lineLeft, height - indicatorHeight, lineRight, height, mPaintIndicator); } private void selectTabTextColor(int position) { BasePagerAdapter adapter = (BasePagerAdapter) pager.getAdapter(); for (int i = 0; i < tabsContainer.getChildCount(); i++) { PagerTabContent content = (PagerTabContent) adapter.getItem(i); if (content.isShowingIcon()) { ImageView tabImage = (ImageView) tabsContainer.getChildAt(i); if (i == position) { tabImage.setSelected(true); } else { tabImage.setSelected(false); } } else { TextView tabText = (TextView) tabsContainer.getChildAt(i); if (i == position) { tabText.setTypeface(null, selectTabTypefaceStyle); tabText.setTextColor(selectTextColor); } else { tabText.setTypeface(null, tabTypefaceStyle); tabText.setTextColor(tabTextColor); } } } } private class PageListener implements OnPageChangeListener { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { currentPosition = position; currentPositionOffset = positionOffset; if (tabsContainer.getChildAt(position) == null) { return; } scrollToChild(position, (int) (positionOffset * tabsContainer.getChildAt(position).getWidth())); invalidate(); selectTabTextColor(position); if (delegatePageListener != null) { delegatePageListener.onPageScrolled(position, positionOffset, positionOffsetPixels); } } @Override public void onPageScrollStateChanged(final int state) { if (state == ViewPager.SCROLL_STATE_IDLE) { } if (delegatePageListener != null) { delegatePageListener.onPageScrollStateChanged(state); } } @Override public void onPageSelected(int position) { if (delegatePageListener != null) { delegatePageListener.onPageSelected(position); } } } 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 setDividerMargin(int dividerPaddingPx) { this.dividerMargin = dividerPaddingPx; invalidate(); } public int getDividerMargin() { return dividerMargin; } 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(); } public void setTabBackground(int resId) { this.tabBackgroundColor = resId; } public int getTabBackground() { return indicatorColor; } 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]; } }; } public OnPageChangeCompleteListener getOnPageChangeCompleteListener() { return onPageChangeCompleteListener; } public void setOnPageChangeCompleteListener(OnPageChangeCompleteListener onPageChangeCompleteListener) { this.onPageChangeCompleteListener = onPageChangeCompleteListener; } public int getSelectTextColor() { return selectTextColor; } public void setSelectTextColor(int selectTextColor) { this.selectTextColor = selectTextColor; } }