car-ui-lib/src/com/android/car/ui/toolbar/SearchView.java

/*
 * Copyright (C) 2019 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.car.ui.toolbar;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.ImageView;

import androidx.constraintlayout.widget.ConstraintLayout;

import com.android.car.ui.R;

import java.util.HashSet;
import java.util.Set;

/**
 * A search view used by {@link Toolbar}.
 */
public class SearchView extends ConstraintLayout {
    private final ImageView mIcon;
    private final EditText mSearchText;
    private final View mCloseIcon;
    private final Set<Toolbar.OnSearchListener> mListeners = new HashSet<>();
    private final TextWatcher mTextWatcher = new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
        }

        @Override
        public void afterTextChanged(Editable editable) {
            onSearch(editable.toString());
        }
    };

    public SearchView(Context context) {
        this(context, null);
    }

    public SearchView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public SearchView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        LayoutInflater inflater = LayoutInflater.from(context);
        inflater.inflate(R.layout.car_ui_toolbar_search_view, this, true);

        mSearchText = requireViewById(R.id.car_ui_toolbar_search_bar);
        mIcon = requireViewById(R.id.car_ui_toolbar_search_icon);
        mCloseIcon = requireViewById(R.id.car_ui_toolbar_search_close);
        mCloseIcon.setOnClickListener(view -> mSearchText.getText().clear());

        mSearchText.setOnFocusChangeListener(
                (view, hasFocus) -> {
                    if (hasFocus) {
                        ((InputMethodManager)
                                context.getSystemService(Context.INPUT_METHOD_SERVICE))
                                .showSoftInput(view, 0);
                    } else {
                        ((InputMethodManager)
                                context.getSystemService(Context.INPUT_METHOD_SERVICE))
                                .hideSoftInputFromWindow(view.getWindowToken(), 0);
                    }
                });

        mSearchText.addTextChangedListener(mTextWatcher);

        mSearchText.setOnEditorActionListener((v, actionId, event) -> {
            if (actionId == EditorInfo.IME_ACTION_DONE
                    || actionId == EditorInfo.IME_ACTION_SEARCH) {
                mSearchText.clearFocus();
            }
            return false;
        });
    }

    @Override
    public void setVisibility(int visibility) {
        boolean showing = visibility == View.VISIBLE && getVisibility() != View.VISIBLE;

        super.setVisibility(visibility);

        if (showing) {
            mSearchText.removeTextChangedListener(mTextWatcher);
            mSearchText.getText().clear();
            mSearchText.addTextChangedListener(mTextWatcher);
            mCloseIcon.setVisibility(View.GONE);

            mSearchText.requestFocus();
        }
    }

    /**
     * Adds a listener for the search text changing.
     * See also {@link #unregisterOnSearchListener(Toolbar.OnSearchListener)}
     */
    public void registerOnSearchListener(Toolbar.OnSearchListener listener) {
        mListeners.add(listener);
    }

    /**
     * Removes a listener.
     * See also {@link #registerOnSearchListener(Toolbar.OnSearchListener)}
     */
    public boolean unregisterOnSearchListener(Toolbar.OnSearchListener listener) {
        return mListeners.remove(listener);
    }

    /**
     * Sets the search hint.
     * @param resId A string resource id of the search hint.
     */
    public void setHint(int resId) {
        mSearchText.setHint(resId);
    }

    /**
     * Sets the search hint
     * @param hint A CharSequence of the search hint.
     */
    public void setHint(CharSequence hint) {
        mSearchText.setHint(hint);
    }

    /** Gets the search hint */
    public CharSequence getHint() {
        return mSearchText.getHint();
    }

    /**
     * Sets a custom icon to display in the search box.
     */
    public void setIcon(Bitmap b) {
        mIcon.setImageBitmap(b);
    }

    /**
     * Sets a custom icon to display in the search box.
     */
    public void setIcon(Drawable d) {
        mIcon.setImageDrawable(d);
    }

    /**
     * Sets a custom icon to display in the search box.
     */
    public void setIcon(int resId) {
        mIcon.setImageResource(resId);
    }

    private void onSearch(String query) {
        mCloseIcon.setVisibility(TextUtils.isEmpty(query) ? View.GONE : View.VISIBLE);

        for (Toolbar.OnSearchListener listener : mListeners) {
            listener.onSearch(query);
        }
    }

    /**
     * Sets the text being searched.
     */
    public void setSearchQuery(String query) {
        mSearchText.setText(query);
        mSearchText.setSelection(mSearchText.getText().length());
    }
}