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[android] Added guide item snapping via android snap helpder for recycler view

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Александр Зацепин 2020-04-29 20:09:30 +03:00 • committed by yoksnod
parent 160899249b
commit eb9460683a
1 changed files with 108 additions and 7 deletions
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115
android/src/com/mapswithme/maps/widget/placepage/GuidesGalleryViewRenderer.java
View file

@ -2,12 +2,20 @@ package com.mapswithme.maps.widget.placepage;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.LinearSmoothScroller;
import androidx.recyclerview.widget.LinearSnapHelper;
import androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.RecyclerView.OnScrollListener;
import androidx.recyclerview.widget.SnapHelper;
import com.mapswithme.maps.R;
import com.mapswithme.maps.gallery.GalleryAdapter;
import com.mapswithme.maps.gallery.ItemSelectedListener;
import com.mapswithme.maps.gallery.Items;
import com.mapswithme.maps.gallery.impl.Factory;
import com.mapswithme.maps.guides.GuidesGallery;
import com.mapswithme.maps.widget.recycler.ItemDecoratorFactory;
@ -18,18 +26,87 @@ import java.util.Objects;
public class GuidesGalleryViewRenderer implements PlacePageViewRenderer<PlacePageData>,
PlacePageStateObserver
{
@Nullable
private static final String EXTRA_SNAP_VIEW_POSITION = "extra_snap_view_position";
@SuppressWarnings("NullableProblems")
@NonNull
private GuidesGallery mGallery;
@SuppressWarnings("NullableProblems")
@NonNull
private RecyclerView mRecyclerView;
@SuppressWarnings("NullableProblems")
@NonNull
private SnapHelper mSnapHelper;
private int mSnapViewPosition;
@SuppressWarnings("NullableProblems")
@NonNull
private RecyclerView.SmoothScroller mSmoothScroller;
@SuppressWarnings("NullableProblems")
@NonNull
private RecyclerView.LayoutManager mLayoutManager;
@NonNull
private final ItemSelectedListener<GuidesGallery.Item> mItemSelectedListener
= new ItemSelectedListener<GuidesGallery.Item>()
{
@Override
public void onItemSelected(@NonNull GuidesGallery.Item item, int position)
{
if (position != mSnapViewPosition)
{
smoothScrollToPosition(position);
return;
}
// if item is activated then open web catalog, otherwise - activate it.
}
@Override
public void onMoreItemSelected(@NonNull GuidesGallery.Item item)
{
// No op.
}
@Override
public void onActionButtonSelected(@NonNull GuidesGallery.Item item, int position)
{
// No op.
}
};
private void smoothScrollToPosition(int position)
{
mSmoothScroller.setTargetPosition(position);
mLayoutManager.startSmoothScroll(mSmoothScroller);
}
@NonNull
private final OnScrollListener mOnScrollListener = new OnScrollListener()
{
@Override
public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState)
{
super.onScrollStateChanged(recyclerView, newState);
if (newState == RecyclerView.SCROLL_STATE_IDLE)
setActiveGuide();
}
};
private void setActiveGuide()
{
View snapView = mSnapHelper.findSnapView(mLayoutManager);
mSnapViewPosition = snapView == null ? 0 : mLayoutManager.getPosition(snapView);
Items.Item item = mGallery.getItems().get(mSnapViewPosition);
Toast.makeText(mRecyclerView.getContext(), "TODO: Shift y for = " + item.getTitle(),
Toast.LENGTH_SHORT).show();
}
@Override
public void render(@NonNull PlacePageData data)
{
mGallery = (GuidesGallery) data;
mRecyclerView.setAdapter(Factory.createGuidesAdapter(mGallery.getItems(), null,
GalleryPlacement.MAP));
GalleryAdapter adapter = Factory.createGuidesAdapter(mGallery.getItems(), mItemSelectedListener,
GalleryPlacement.MAP);
mRecyclerView.setAdapter(adapter);
setActiveGuide();
}
@Override
@ -43,12 +120,23 @@ public class GuidesGalleryViewRenderer implements PlacePageViewRenderer<PlacePag
{
Objects.requireNonNull(view);
mRecyclerView = view.findViewById(R.id.guides_gallery);
mRecyclerView.setLayoutManager(new LinearLayoutManager(view.getContext(),
LinearLayoutManager.HORIZONTAL, false));
// TODO: implement new item decoration.
mLayoutManager = new LinearLayoutManager(view.getContext(),
LinearLayoutManager.HORIZONTAL, false);
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.addItemDecoration(
ItemDecoratorFactory.createSponsoredGalleryDecorator(view.getContext(),
LinearLayoutManager.HORIZONTAL));
mSnapHelper = new LinearSnapHelper();
mSnapHelper.attachToRecyclerView(mRecyclerView);
mRecyclerView.addOnScrollListener(mOnScrollListener);
mSmoothScroller = new LinearSmoothScroller(mRecyclerView.getContext())
{
@Override
protected int getHorizontalSnapPreference()
{
return LinearSmoothScroller.SNAP_TO_ANY;
}
};
}
@Override
@ -60,13 +148,26 @@ public class GuidesGalleryViewRenderer implements PlacePageViewRenderer<PlacePag
@Override
public void onSave(@NonNull Bundle outState)
{
outState.putParcelable(PlacePageUtils.EXTRA_PLACE_PAGE_DATA, mGallery);
outState.putInt(EXTRA_SNAP_VIEW_POSITION, mSnapViewPosition);
}
@Override
public void onRestore(@NonNull Bundle inState)
{
//noinspection ConstantConditions
mGallery = inState.getParcelable(PlacePageUtils.EXTRA_PLACE_PAGE_DATA);
if (mGallery == null)
return;
GalleryAdapter adapter = Factory.createGuidesAdapter(mGallery.getItems(), mItemSelectedListener,
GalleryPlacement.MAP);
mRecyclerView.setAdapter(adapter);
mSnapViewPosition = inState.getInt(EXTRA_SNAP_VIEW_POSITION);
mRecyclerView.post(() -> {
smoothScrollToPosition(mSnapViewPosition);
setActiveGuide();
});
}
@Override