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/*
* mygram-droid: Android TV client for Foldergram.
* Copyright (C) 2026 Danilo M. <danix@danix.xyz>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
package mygram.droid;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.Gravity;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
/** One folder as a grid, paged in lazily in random page order. */
public final class FolderActivity extends Activity {
private FrameLayout content;
private RecyclerView grid;
private final List<Post> posts = new ArrayList<>();
private final List<TileAdapter.Tile> tiles = new ArrayList<>();
private Callable<List<Post>> more;
private boolean loading;
static void open(Context c, Api.Folder f) {
c.startActivity(new Intent(c, FolderActivity.class).putExtra("slug", f.slug).putExtra("name", f.name)
.putExtra("count", f.count));
}
@Override
protected void onCreate(Bundle state) {
super.onCreate(state);
LinearLayout column = new LinearLayout(this);
column.setOrientation(LinearLayout.VERTICAL);
LinearLayout header = new LinearLayout(this);
header.setGravity(Gravity.CENTER_VERTICAL);
int p = Ui.dp(this, 16);
header.setPadding(p * 2, p, p * 2, 0);
header.addView(Ui.iconButton(this, R.drawable.ic_arrow_back, "Back", v -> finish()));
TextView title = Ui.text(this, getIntent().getStringExtra("name"), 24);
title.setPadding(p, 0, 0, 0);
header.addView(title);
column.addView(header);
content = new FrameLayout(this);
column.addView(content, new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 0, 1));
setContentView(column);
show(Ui.text(this, "Loading…", 18));
more = Api.folderPages(getIntent().getStringExtra("slug"), getIntent().getIntExtra("count", 0));
loading = true;
Api.async(more, page -> {
loading = false;
if (isDestroyed())
return;
append(page);
if (page.isEmpty()) {
show(Ui.text(this, "Nothing to show", 18));
return;
}
grid = Ui.grid(this, tiles, Ui.POST_W, Ui.POST_H, 6);
grid.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView rv, int dx, int dy) {
loadMore();
}
});
show(grid);
grid.post(grid::requestFocus); // after layout
}, e -> {
loading = false;
show(Ui.text(this, "Cannot load folder: " + e.getMessage(), 18));
});
}
/** Loads the next page when the last visible tile is within 12 of the end. */
private void loadMore() {
if (more == null || loading || grid == null)
return;
if (((GridLayoutManager) grid.getLayoutManager()).findLastVisibleItemPosition() < tiles.size() - 12)
return;
loading = true;
Api.async(more, page -> {
loading = false;
if (isDestroyed())
return;
if (page.isEmpty())
more = null;
append(page);
}, e -> {
loading = false;
if (!isDestroyed())
Toast.makeText(this, "Cannot load more: " + e.getMessage(), Toast.LENGTH_SHORT).show();
});
}
/** Pages from one pager never overlap, so no id check is needed here. */
private void append(List<Post> page) {
posts.addAll(page);
addTiles();
}
private void addTiles() {
int old = tiles.size();
for (int i = old; i < posts.size(); i++) {
int start = i;
tiles.add(TileAdapter.post(posts.get(i), () -> Playlist.open(this, posts, start, more)));
}
if (grid != null && tiles.size() > old)
grid.getAdapter().notifyItemRangeInserted(old, tiles.size() - old);
}
@Override
protected void onResume() {
super.onResume();
if (grid != null && grid.getAdapter() != null) {
addTiles(); // the viewer may have appended to the shared list
grid.getAdapter().notifyItemRangeChanged(0, grid.getAdapter().getItemCount());
}
}
private void show(android.view.View v) {
content.removeAllViews();
content.addView(v);
}
}
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