app/src/main/java/me/zhanghai/android/douya/util/CheatSheetUtils.java

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/*
 * Copyright (c) 2015 Zhang Hai <Dreaming.in.Code.ZH@Gmail.com>
 * All Rights Reserved.
 */

/*
 * From https://gist.github.com/romannurik/3982005
 */

package me.zhanghai.android.douya.util;

import android.content.Context;
import android.graphics.Rect;
import android.text.TextUtils;
import android.view.Gravity;
import android.view.View;
import android.widget.Toast;

/**
 * Helper class for showing cheat sheets (tooltips) for icon-only UI elements on long-press. This is
 * already default platform behavior for icon-only {@link android.app.ActionBar} items and tabs.
 * This class provides this behavior for any other such UI element.
 *
 * <p>Based on the original action bar implementation in <a href="https://android.googlesource.com/platform/frameworks/base/+/refs/heads/master/core/java/com/android/internal/view/menu/ActionMenuItemView.java">
 * ActionMenuItemView.java</a>.
 */
public class CheatSheetUtils {

    /**
     * The estimated height of a toast, in dips (density-independent pixels). This is used to
     * determine whether or not the toast should appear above or below the UI element.
     */
    private static final int ESTIMATED_TOAST_HEIGHT_DIPS = 48;

    /**
     * Sets up a cheat sheet (tooltip) for the given view by setting its {@link
     * View.OnLongClickListener}. When the view is long-pressed, a {@link Toast} with
     * the view's {@link View#getContentDescription() content description} will be
     * shown either above (default) or below the view (if there isn't room above it).
     *
     * @param view The view to add a cheat sheet for.
     */
    public static void setup(View view) {
        view.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View view) {
                return show(view, view.getContentDescription());
            }
        });
    }

    /**
     * Sets up a cheat sheet (tooltip) for the given view by setting its {@link
     * View.OnLongClickListener}. When the view is long-pressed, a {@link Toast} with
     * the given text will be shown either above (default) or below the view (if there isn't room
     * above it).
     *
     * @deprecated Use {@link #setup(View)} instead.
     *
     * @param view      The view to add a cheat sheet for.