Initial, unpolished version of DatasetPicker.

/*

 * Copyright (C) 2017 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * 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.android.server.autofill;

import static com.android.server.autofill.Helper.DEBUG;

import android.app.Activity;

import android.content.Context;

import android.util.Slog;

import android.view.View;

import android.view.WindowManager;

import android.view.autofill.Dataset;

import android.widget.ImageView;

import android.widget.LinearLayout;

import android.widget.TextView;

import java.util.List;

/**

 * View responsible for drawing the {@link Dataset} options that can be used to auto-fill an

 * {@link Activity}.

 */

final class DatasetPicker extends LinearLayout {

    private static final String TAG = "DatasetPicker";

    // TODO(b/33197203): use / calculate proper values instead of hardcoding them

    private static final LayoutParams NAME_PARAMS = new LayoutParams(400,

            WindowManager.LayoutParams.WRAP_CONTENT);

    private static final LayoutParams DROP_DOWN_PARAMS = new LayoutParams(100,

            WindowManager.LayoutParams.WRAP_CONTENT);

    private final Line[] mLines;

    private boolean mExpanded;

    private final Listener mListener;

    public DatasetPicker(Context context, Listener listener, List<Dataset> datasets) {

        super(context);

        mListener = listener;

        // TODO(b/33197203): use XML layout

        setOrientation(LinearLayout.VERTICAL);

        final int size = datasets.size();

        mLines = new Line[size];

        for (int i = 0; i < size; i++) {

            final boolean first = i == 0;

            final Line line = new Line(context, datasets.get(i), first);

            mLines[i] = line;

            if (first) {

                addView(line);

            }

        }

        mExpanded = false;

    }

    private void togleDropDown() {

        if (mExpanded) {

            hideDropDown();

            return;

        }

        for (int i = 1; i < mLines.length; i++) {

            addView(mLines[i]);

        }

        mExpanded = true;

    }

    private void hideDropDown() {

        if (!mExpanded) return;

        // TODO(b/33197203): invert order to be less janky?

        for (int i = 1; i < mLines.length; i++) {

            removeView(mLines[i]);

        }

        mExpanded = false;

    }

    private class Line extends LinearLayout {

        final TextView name;

        final ImageView dropDown;

        private Line(Context context, Dataset dataset, boolean first) {

            super(context);

            final View.OnClickListener l = new View.OnClickListener() {

                @Override

                public void onClick(View v) {

                    if (DEBUG) Slog.d(TAG, "dataset picked: " + dataset.getName());

                    mListener.onDatasetPicked(dataset);

                }

            };

            // TODO(b/33197203): use XML layout

            setOrientation(LinearLayout.HORIZONTAL);

            name = new TextView(context);

            name.setLayoutParams(NAME_PARAMS);

            name.setText(dataset.getName());

            name.setOnClickListener(l);

            dropDown = new ImageView(context);

            dropDown.setLayoutParams(DROP_DOWN_PARAMS);

            // TODO(b/33197203): use proper icon

            dropDown.setImageResource(com.android.internal.R.drawable.arrow_down_float);

            dropDown.setOnClickListener((v) -> {

                togleDropDown();

            });

            if (!first) {

                dropDown.setVisibility(View.INVISIBLE);

            }

            addView(name);

            addView(dropDown);

        }

    }

    static interface Listener {

        void onDatasetPicked(Dataset dataset);

    }

}