content: /*
   * 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.cjj.mousepaint.customview;
  
  import android.content.Context;
  import android.content.res.TypedArray;
  import android.graphics.Canvas;
  import android.graphics.Paint;
  import android.graphics.Paint.Style;
  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 com.cjj.mousepaint.R;
  
  import java.util.Locale;
  
  
  public class PagerSlidingTabStrip 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 int tabCount;
  
  	private int currentPosition = 0;
  	private int selectedPosition = 0;
  	private float currentPositionOffset = 0f;
  
  	private Paint rectPaint;
  	private Paint dividerPaint;
  
  	private int indicatorColor = 0xFF666666;
  	private int underlineColor = 0x1A000000;
  	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 = 1;
  
  	private int tabTextSize = 12;
  	private int tabTextColor = 0xFFffffff;
  	private int selectedTabTextColor = 0xFF666666;
  	private Typeface tabTypeface = null;
  	private int tabTypefaceStyle = Typeface.NORMAL;
  
  	private int lastScrollX = 0;
  
  	private int tabBackgroundResId = R.drawable.background_tab;
  
  	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);
  
  		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);
  
  		a.recycle();
  
  		// get custom attrs
  
  		a = context.obtainStyledAttributes(attrs, R.styleable.PagerSlidingTabStrip);
  
  		indicatorColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsIndicatorColor, indicatorColor);
  		underlineColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsUnderlineColor, underlineColor);
  		dividerColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsDividerColor, dividerColor);
  		indicatorHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsIndicatorHeight, indicatorHeight);
  		underlineHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsUnderlineHeight, underlineHeight);
  		dividerPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsDividerPadding, dividerPadding);
  		tabPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsTabPaddingLeftRight, tabPadding);
  		tabBackgroundResId = a.getResourceId(R.styleable.PagerSlidingTabStrip_pstsTabBackground, tabBackgroundResId);
  		shouldExpand = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsShouldExpand, shouldExpand);
  		scrollOffset = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsScrollOffset, scrollOffset);
  		textAllCaps = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsTextAllCaps, textAllCaps);
  
  		a.recycle();
  
  		rectPaint = new Paint();
  		rectPaint.setAntiAlias(true);
  		rectPaint.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();
  	}
  
  	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();
  
  		getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
  
  			@Override
  			public void onGlobalLayout() {
  				getViewTreeObserver().removeGlobalOnLayoutListener(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 addTab(final int position, View tab) {
  		tab.setFocusable(true);
  		tab.setOnClickListener(new OnClickListener() {
  			@Override
  			public void onClick(View v) {
  				pager.setCurrentItem(position);
  			}
  		});
  
  		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));
  					}
  				}
  				if (i == selectedPosition) {
  					tab.setTextColor(selectedTabTextColor);
  				}
  			}
  		}
  
  	}
  
  	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);
  		}
  
  	}
  
  	@Override
  	protected void onDraw(Canvas canvas) {
  		super.onDraw(canvas);
  
  		if (isInEditMode() || tabCount == 0) {
  			return;
  		}
  
  		final int height = getHeight();
  		
  		// draw underline
  		rectPaint.setColor(underlineColor);
  		canvas.drawRect(0, height - underlineHeight, tabsContainer.getWidth(), height, rectPaint);
  
  		// 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);
  			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);
  
  		// 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) {
  			selectedPosition = position;
  			updateTabStyles();
  			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 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;
  		notifyDataSetChanged();
  	}
  
  	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 setSelectedTextColor(int textColor) {
  		this.selectedTabTextColor = textColor;
  		updateTabStyles();
  	}
  	
  	public void setSelectedTextColorResource(int resId) {
  		this.selectedTabTextColor = getResources().getColor(resId);
  		updateTabStyles();
  	}
  
  	public int getSelectedTextColor() {
  		return selectedTabTextColor;
  	}
  
  	public void setTypeface(Typeface typeface, int style) {
  		this.tabTypeface = typeface;
  		this.tabTypefaceStyle = style;
  		updateTabStyles();
  	}
  
  	public void setTabBackground(int resId) {
  		this.tabBackgroundResId = resId;
  		updateTabStyles();
  	}
  
  	public int getTabBackground() {
  		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];
  			}
  		};
  	}
  
  }
  