ac.robinson.bettertogether.QRPopupWindow.java Source code

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Here is the source code for ac.robinson.bettertogether.QRPopupWindow.java

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/*
 * Copyright (C) 2017 The Better Together Toolkit
 *
 * 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 ac.robinson.bettertogether;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.os.Build;
import android.support.v4.widget.PopupWindowCompat;
import android.util.DisplayMetrics;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.PopupWindow;

class QRPopupWindow {
    private View mAnchorView;
    private PopupWindow mPopupWindow;
    private WindowManager mWindowManager;

    // suppress because we don't have (and can't get) a root view for the PopupWindow
    @SuppressLint("InflateParams")
    QRPopupWindow(View anchorView) {
        mAnchorView = anchorView;
        mWindowManager = (WindowManager) mAnchorView.getContext().getSystemService(Context.WINDOW_SERVICE);
        mPopupWindow = new PopupWindow(mAnchorView.getContext());

        LayoutInflater inflater = (LayoutInflater) mAnchorView.getContext()
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        mPopupWindow.setContentView(inflater.inflate(R.layout.dialog_qr_code, null));

        mPopupWindow.setTouchInterceptor(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent event) {
                dismissPopUp();
                return true;
            }
        });
    }

    void setQRBitmap(Bitmap background) {
        mPopupWindow.setBackgroundDrawable(new BitmapDrawable(mAnchorView.getResources(), background));
    }

    void showPopUp() {
        // could use mPopupWindow.getMaxAvailableHeight() if only there was a width version!
        DisplayMetrics displayMetrics = new DisplayMetrics();
        mWindowManager.getDefaultDisplay().getMetrics(displayMetrics);
        int popupSize = (int) Math
                .round((displayMetrics.widthPixels > displayMetrics.heightPixels ? displayMetrics.heightPixels
                        : displayMetrics.widthPixels) * 0.9);

        // normally: WindowManager.LayoutParams.WRAP_CONTENT);
        mPopupWindow.setWidth(popupSize);
        mPopupWindow.setHeight(popupSize);
        mPopupWindow.setTouchable(true);
        mPopupWindow.setFocusable(true);
        mPopupWindow.setOutsideTouchable(true);
        mPopupWindow.setAnimationStyle(android.R.style.Animation_Dialog);

        int elevation = mAnchorView.getContext().getResources().getDimensionPixelSize(R.dimen.default_elevation);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            mPopupWindow.setElevation(elevation);
        }

        // display as popup overlaying anchor view - as 4dp elevation is same as horizontal offset, use that precalculated value
        PopupWindowCompat.setOverlapAnchor(mPopupWindow, true);
        PopupWindowCompat.showAsDropDown(mPopupWindow, mAnchorView, -elevation, 0, Gravity.TOP | Gravity.END);
    }

    private void dismissPopUp() {
        mPopupWindow.dismiss();
    }
}