/*
* Copyright (c) 2015 [1076559197@qq.com | tchen0707@gmail.com]
*
* Licensed under the Apache License, Version 2.0 (the "Licenseā);
* 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.dreamspace.uucampus.widget.smartlayout;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Build;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.dreamspace.uucampus.R;
/**
* To be used with ViewPager to provide a tab indicator component which give constant feedback as to
* the user's scroll progress.
* <p>
* To use the component, simply add it to your view hierarchy. Then in your
* {@link android.app.Activity} or {@link android.app.Fragment}, {@link android.support.v4.app.Fragment} call
* {@link #setViewPager(android.support.v4.view.ViewPager)} providing it the ViewPager this layout is being used for.
* <p>
* The colors can be customized in two ways. The first and simplest is to provide an array of colors
* via {@link #setSelectedIndicatorColors(int...)} and {@link #setDividerColors(int...)}. The
* which color is used for any individual position.
* <p>
* The views used as tabs can be customized by calling {@link #setCustomTabView(int, int)},
* providing the layout ID of your custom layout.
* <p>
* Forked from Google Samples > SlidingTabsBasic >
* <a href="https://developer.android.com/samples/SlidingTabsBasic/src/com.example.android.common/view/SlidingTabLayout.html">SlidingTabLayout</a>
*/
public class SmartTabLayout extends HorizontalScrollView {
/**
* Allows complete control over the colors drawn in the tab layout. Set with
*/
public interface TabColorizer {
/**
* @return return the color of the indicator used when {@code position} is selected.
*/
int getIndicatorColor(int position);
/**
* @return return the color of the divider drawn to the right of {@code position}.
*/
int getDividerColor(int position);
}
private static final boolean DEFAULT_DISTRIBUTE_EVENLY = false;
private static final int TITLE_OFFSET_DIPS = 24;
private static final int TAB_VIEW_PADDING_DIPS = 16;
private static final boolean TAB_VIEW_TEXT_ALL_CAPS = true;
private static final int TAB_VIEW_TEXT_SIZE_SP = 12;
private static final int TAB_VIEW_TEXT_COLOR = 0xFC000000;
private static final int TAB_VIEW_TEXT_MIN_WIDTH = 0;
private int mTitleOffset;
private boolean mTabViewTextAllCaps;
private int mTabViewTextColor;
private float mTabViewTextSize;
private int mTabViewTextHorizontalPadding;
private int mTabViewTextMinWidth;
private int mTabViewLayoutId;
private int mTabViewTextViewId;
private ViewPager mViewPager;
private ViewPager.OnPageChangeListener mViewPagerPageChangeListener;
private boolean mDistributeEvenly;
protected final SmartTabStrip mTabStrip;
public SmartTabLayout(Context context) {
this(context, null);
}
public SmartTabLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public SmartTabLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// Disable the Scroll Bar
setHorizontalScrollBarEnabled(false);
// Make sure that the Tab Strips fills this View
setFillViewport(true);
setOverScrollMode(OVER_SCROLL_NEVER);
final DisplayMetrics dm = getResources().getDisplayMetrics();
final float density = dm.density;
boolean textAllCaps = TAB_VIEW_TEXT_ALL_CAPS;
int textColor = TAB_VIEW_TEXT_COLOR;
float textSize = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, TAB_VIEW_TEXT_SIZE_SP, dm);
int textHorizontalPadding = (int) (TAB_VIEW_PADDING_DIPS * density);
int textMinWidth = (int) (TAB_VIEW_TEXT_MIN_WIDTH * density);
boolean distributeEvenly = DEFAULT_DISTRIBUTE_EVENLY;
int textLayoutId = NO_ID;
int textViewId = NO_ID;
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.stl_SmartTabLayout, defStyle, 0);
textAllCaps = a.getBoolean(R.styleable.stl_SmartTabLayout_stl_defaultTabTextAllCaps, textAllCaps);
textColor = a.getColor(R.styleable.stl_SmartTabLayout_stl_defaultTabTextColor, textColor);
textSize = a.getDimension(R.styleable.stl_SmartTabLayout_stl_defaultTabTextSize, textSize);
textHorizontalPadding = a.getDimensionPixelSize(R.styleable.stl_SmartTabLayout_stl_defaultTabTextHorizontalPadding, textHorizontalPadding);
textMinWidth = a.getDimensionPixelSize(R.styleable.stl_SmartTabLayout_stl_defaultTabTextMinWidth, textMinWidth);
textLayoutId = a.getResourceId(R.styleable.stl_SmartTabLayout_stl_customTabTextLayoutId, textLayoutId);
textViewId = a.getResourceId(R.styleable.stl_SmartTabLayout_stl_customTabTextViewId, textViewId);
distributeEvenly = a.getBoolean(R.styleable.stl_SmartTabLayout_stl_distributeEvenly, distributeEvenly);
a.recycle();
mTitleOffset = (int) (TITLE_OFFSET_DIPS * density);
mTabViewTextAllCaps = textAllCaps;
mTabViewTextColor = textColor;
mTabViewTextSize = textSize;
mTabViewTextHorizontalPadding = textHorizontalPadding;
mTabViewTextMinWidth = textMinWidth;
mTabViewLayoutId = textLayoutId;
mTabViewTextViewId = textViewId;
mDistributeEvenly = distributeEvenly;
mTabStrip = new SmartTabStrip(context, attrs);
if (distributeEvenly && mTabStrip.isIndicatorAlwaysInCenter()) {
throw new UnsupportedOperationException(
"'distributeEvenly' and 'indicatorAlwaysInCenter' both use does not support");
}
addView(mTabStrip, LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
if (mTabStrip.isIndicatorAlwaysInCenter() && getChildCount() > 0) {
int left = (w - mTabStrip.getChildMeasuredWidthAt(0)) / 2;
int right = (w - mTabStrip.getChildMeasuredWidthAt(getChildCount() - 1)) / 2;
setPadding(left, getPaddingTop(), right, getPaddingBottom());
setClipToPadding(false);
}
}
/**
* Set the behavior of the Indicator scrolling feedback.
*
*/
public void setIndicationInterpolator(SmartTabIndicationInterpolator interpolator) {
mTabStrip.setIndicationInterpolator(interpolator);
}
/**
*
* If you only require simple custmisation then you can use
* {@link #setSelectedIndicatorColors(int...)} and {@link #setDividerColors(int...)} to achieve
* similar effects.
*/
public void setCustomTabColorizer(TabColorizer tabColorizer) {
mTabStrip.setCustomTabColorizer(tabColorizer);
}
/**
* Set the same weight for tab
*/
public void setDistributeEvenly(boolean distributeEvenly) {
mDistributeEvenly = distributeEvenly;
}
/**
* Sets the colors to be used for indicating the selected tab. These colors are treated as a
* circular array. Providing one color will mean that all tabs are indicated with the same color.
*/
public void setSelectedIndicatorColors(int... colors) {
mTabStrip.setSelectedIndicatorColors(colors);
}
/**
* Sets the colors to be used for tab dividers. These colors are treated as a circular array.
* Providing one color will mean that all tabs are indicated with the same color.
*/
public void setDividerColors(int... colors) {
mTabStrip.setDividerColors(colors);
}
/**
* required to set any {@link android.support.v4.view.ViewPager.OnPageChangeListener} through this method. This is so
* that the layout can update it's scroll position correctly.
*
* @see android.support.v4.view.ViewPager#setOnPageChangeListener(android.support.v4.view.ViewPager.OnPageChangeListener)
*/
public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) {
mViewPagerPageChangeListener = listener;
}
/**
* Set the custom layout to be inflated for the tab views.
*
* @param layoutResId Layout id to be inflated
* @param textViewId id of the {@link TextView} in the inflated view
*/
public void setCustomTabView(int layoutResId, int textViewId) {
mTabViewLayoutId = layoutResId;
mTabViewTextViewId = textViewId;
}
/**
* Sets the associated view pager. Note that the assumption here is that the pager content
* (number of tabs and tab titles) does not change after this call has been made.
*/
public void setViewPager(ViewPager viewPager) {
mTabStrip.removeAllViews();
mViewPager = viewPager;
if (viewPager != null) {
viewPager.setOnPageChangeListener(new InternalViewPagerListener());
populateTabStrip();
}
}
/**
* Create a default view to be used for tabs. This is called if a custom tab view is not set via
* {@link #setCustomTabView(int, int)}.
*/
protected TextView createDefaultTabView(Context context) {
TextView textView = new TextView(context);
textView.setGravity(Gravity.CENTER);
textView.setTextColor(mTabViewTextColor);
textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, mTabViewTextSize);
textView.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.MATCH_PARENT));
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
// If we're running on Honeycomb or newer, then we can use the Theme's
// selectableItemBackground to ensure that the View has a pressed state
TypedValue outValue = new TypedValue();
getContext().getTheme().resolveAttribute(android.R.attr.selectableItemBackground,
outValue, true);
textView.setBackgroundResource(outValue.resourceId);
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
// If we're running on ICS or newer, enable all-caps to match the Action Bar tab style
textView.setAllCaps(mTabViewTextAllCaps);
}
textView.setPadding(
mTabViewTextHorizontalPadding, 0,
mTabViewTextHorizontalPadding, 0);
if (mTabViewTextMinWidth > 0) {
textView.setMinWidth(mTabViewTextMinWidth);
}
return textView;
}
private void populateTabStrip() {
final PagerAdapter adapter = mViewPager.getAdapter();
final OnClickListener tabClickListener = new TabClickListener();
final LayoutInflater inflater = LayoutInflater.from(getContext());
for (int i = 0; i < adapter.getCount(); i++) {
View tabView = null;
TextView tabTitleView = null;
if (mTabViewLayoutId != NO_ID) {
// If there is a custom tab view layout id set, try and inflate it
tabView = inflater.inflate(mTabViewLayoutId, mTabStrip, false);
}
if (mTabViewTextViewId != NO_ID && tabView != null) {
tabTitleView = (TextView) tabView.findViewById(mTabViewTextViewId);
}
if (tabView == null) {
tabView = createDefaultTabView(getContext());
}
if (tabTitleView == null && TextView.class.isInstance(tabView)) {
tabTitleView = (TextView) tabView;
}
if (tabTitleView == null) {
throw new IllegalStateException("tabTitleView not found.");
}
if (mDistributeEvenly) {
LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) tabView.getLayoutParams();
lp.width = 0;
lp.weight = 1;
}
tabTitleView.setText(adapter.getPageTitle(i));
tabView.setOnClickListener(tabClickListener);
mTabStrip.addView(tabView);
if (i == mViewPager.getCurrentItem()) {
tabView.setSelected(true);
}
}
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
if (mViewPager != null) {
scrollToTab(mViewPager.getCurrentItem(), 0);
}
}
private void scrollToTab(int tabIndex, int positionOffset) {
final int tabStripChildCount = mTabStrip.getChildCount();
if (tabStripChildCount == 0 || tabIndex < 0 || tabIndex >= tabStripChildCount) {
return;
}
View selectedChild = mTabStrip.getChildAt(tabIndex);
if (selectedChild != null) {
int targetScrollX = selectedChild.getLeft() + positionOffset;
if (mTabStrip.isIndicatorAlwaysInCenter()) {
targetScrollX -= (mTabStrip.getChildWidthAt(0) - selectedChild.getWidth()) / 2;
} else if (tabIndex > 0 || positionOffset > 0) {
// If we're not at the first child and are mid-scroll, make sure we obey the offset
targetScrollX -= mTitleOffset;
}
scrollTo(targetScrollX, 0);
}
}
private class InternalViewPagerListener implements ViewPager.OnPageChangeListener {
private int mScrollState;
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
int tabStripChildCount = mTabStrip.getChildCount();
if ((tabStripChildCount == 0) || (position < 0) || (position >= tabStripChildCount)) {
return;
}
mTabStrip.onViewPagerPageChanged(position, positionOffset);
View selectedTitle = mTabStrip.getChildAt(position);
int extraOffset = (selectedTitle != null)
? (int) (positionOffset * selectedTitle.getWidth())
: 0;
if (0f < positionOffset && positionOffset < 1f
&& mTabStrip.isIndicatorAlwaysInCenter()) {
int current = mTabStrip.getChildWidthAt(position) / 2;
int next = mTabStrip.getChildWidthAt(position + 1) / 2;
extraOffset = Math.round(positionOffset * (current + next));
}
scrollToTab(position, extraOffset);
if (mViewPagerPageChangeListener != null) {
mViewPagerPageChangeListener.onPageScrolled(position, positionOffset,
positionOffsetPixels);
}
}
@Override
public void onPageScrollStateChanged(int state) {
mScrollState = state;
if (mViewPagerPageChangeListener != null) {
mViewPagerPageChangeListener.onPageScrollStateChanged(state);
}
}
@Override
public void onPageSelected(int position) {
if (mScrollState == ViewPager.SCROLL_STATE_IDLE) {
mTabStrip.onViewPagerPageChanged(position, 0f);
scrollToTab(position, 0);
}
for (int i = 0, size = mTabStrip.getChildCount(); i < size; i++) {
mTabStrip.getChildAt(i).setSelected(position == i);
}
if (mViewPagerPageChangeListener != null) {
mViewPagerPageChangeListener.onPageSelected(position);
}
}
}
private class TabClickListener implements OnClickListener {
@Override
public void onClick(View v) {
for (int i = 0; i < mTabStrip.getChildCount(); i++) {
if (v == mTabStrip.getChildAt(i)) {
mViewPager.setCurrentItem(i);
return;
}
}
}
}
}