78 lines
3.4 KiB
Java
78 lines
3.4 KiB
Java
package eu.siacs.conversations.ui.util;
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import android.content.Context;
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import androidx.annotation.DimenRes;
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import androidx.recyclerview.widget.GridLayoutManager;
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import androidx.recyclerview.widget.RecyclerView;
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import android.util.Log;
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import android.view.ViewTreeObserver;
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import eu.siacs.conversations.Config;
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import eu.siacs.conversations.ui.adapter.MediaAdapter;
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public class GridManager {
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public static void setupLayoutManager(final Context context, RecyclerView recyclerView, @DimenRes int desiredSize) {
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int maxWidth = context.getResources().getDisplayMetrics().widthPixels;
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ColumnInfo columnInfo = calculateColumnCount(context, maxWidth, desiredSize);
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Log.d(Config.LOGTAG, "preliminary count=" + columnInfo.count);
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MediaAdapter.setMediaSize(recyclerView, columnInfo.width);
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recyclerView.setLayoutManager(new GridLayoutManager(context, columnInfo.count));
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recyclerView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
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@Override
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public void onGlobalLayout() {
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recyclerView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
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final int availableWidth = recyclerView.getMeasuredWidth();
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if (availableWidth == 0) {
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Log.e(Config.LOGTAG,"GridManager: available width was 0; probably because layout was hidden");
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return;
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}
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final ColumnInfo columnInfo = calculateColumnCount(context, recyclerView.getMeasuredWidth(), desiredSize);
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Log.d(Config.LOGTAG, "final count " + columnInfo.count);
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final RecyclerView.Adapter adapter = recyclerView.getAdapter();
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if (adapter != null && adapter.getItemCount() != 0) {
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Log.e(Config.LOGTAG, "adapter already has items; just go with it now");
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return;
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}
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setupLayoutManagerInternal(recyclerView, columnInfo);
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MediaAdapter.setMediaSize(recyclerView, columnInfo.width);
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}
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});
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}
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private static void setupLayoutManagerInternal(RecyclerView recyclerView, final ColumnInfo columnInfo) {
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RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
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if (layoutManager instanceof GridLayoutManager) {
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((GridLayoutManager) layoutManager).setSpanCount(columnInfo.count);
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}
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}
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private static ColumnInfo calculateColumnCount(Context context, int availableWidth, @DimenRes int desiredSize) {
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final float desiredWidth = context.getResources().getDimension(desiredSize);
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final int columns = Math.round(availableWidth / desiredWidth);
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final int realWidth = availableWidth / columns;
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Log.d(Config.LOGTAG, "desired=" + desiredWidth + " real=" + realWidth);
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return new ColumnInfo(columns, realWidth);
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}
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public static int getCurrentColumnCount(RecyclerView recyclerView) {
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RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
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if (layoutManager instanceof GridLayoutManager) {
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return ((GridLayoutManager) layoutManager).getSpanCount();
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} else {
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return 0;
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}
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}
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public static class ColumnInfo {
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private final int count;
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private final int width;
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private ColumnInfo(int count, int width) {
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this.count = count;
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this.width = width;
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}
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}
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}
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