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add DataSetObserver callback #304

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add DataSetObserver callback #304

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30 changes: 28 additions & 2 deletions library/src/main/java/com/ogaclejapan/smarttablayout/SmartTabLayout.java
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,7 @@
import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.TypedArray;
import android.database.DataSetObserver;
import android.graphics.Typeface;
import android.os.Build;
import android.util.AttributeSet;
Expand Down Expand Up @@ -85,6 +86,7 @@ public class SmartTabLayout extends HorizontalScrollView {
private TabProvider tabProvider;
private InternalTabClickListener internalTabClickListener;
private OnTabClickListener onTabClickListener;
private DataSetObserver mDataSetObserver;
private boolean distributeEvenly;

public SmartTabLayout(Context context) {
Expand Down Expand Up @@ -320,11 +322,16 @@ public void setCustomTabView(TabProvider provider) {
* (number of tabs and tab titles) does not change after this call has been made.
*/
public void setViewPager(ViewPager viewPager) {
tabStrip.removeAllViews();

this.viewPager = viewPager;
if (viewPager != null && viewPager.getAdapter() != null) {
viewPager.addOnPageChangeListener(new InternalViewPagerListener());

if(mDataSetObserver !=null)
viewPager.getAdapter().unregisterDataSetObserver(mDataSetObserver);
if(mDataSetObserver == null){
mDataSetObserver = new TabDataSetObserver();
}
viewPager.getAdapter().registerDataSetObserver(mDataSetObserver);
populateTabStrip();
}
}
Expand Down Expand Up @@ -382,6 +389,8 @@ protected TextView createDefaultTabView(CharSequence title) {
}

private void populateTabStrip() {
tabStrip.removeAllViews();

final PagerAdapter adapter = viewPager.getAdapter();

for (int i = 0; i < adapter.getCount(); i++) {
Expand Down Expand Up @@ -550,6 +559,23 @@ public interface TabProvider {

}

/**
* When adapter data is change,callback invoke
* {@link android.database.DataSetObservable}
*/
private class TabDataSetObserver extends DataSetObserver {

@Override
public void onChanged() {
populateTabStrip();
}

@Override
public void onInvalidated() {
populateTabStrip();
}
}

private static class SimpleTabProvider implements TabProvider {

private final LayoutInflater inflater;
Expand Down