LauncherFragment.java

/*
 * Copyright 2014 Klinker Apps Inc.
 *
 * 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 xyz.klinker.blur.extra_pages.calc_page;

import android.content.Context;
import android.os.Build;
import android.view.View;
import android.widget.*;

import xyz.klinker.blur.extra_pages.BaseLauncherPage;
import xyz.klinker.blur.extra_pages.R;

import org.javia.arity.SyntaxException;

/**
 * Fragment to display all of the info cards that are created and implemented by library
 */
public class LauncherFragment extends BaseLauncherPage {

    public Context context;
    private String syntaxError;

    // root view of the fragment
    private LinearLayout content;
    protected TextView equation;

    @Override
    public BaseLauncherPage getNewInstance() {
        return new LauncherFragment();
    }

    @Override
    public int getLayoutRes() {
        return R.layout.calculator_page;
    }

    @Override
    public void initLayout(View inflated) {
        context = getActivity();
        syntaxError = getString(R.string.syntax_error);

        content = (LinearLayout) root.findViewById(R.id.content);
        equation = (TextView) root.findViewById(R.id.calculations);

        // Add padding at the bottom of the list if the navigation bar is showing and translucent
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT && Utils.hasNavBar(context)) {
            LinearLayout navBarSpace = new LinearLayout(context);
            navBarSpace.setLayoutParams(new LinearLayout.LayoutParams(
                    LinearLayout.LayoutParams.MATCH_PARENT,
                    Utils.getNavBarHeight(context)
            ));

            content.addView(navBarSpace);
        }

        setUpLayout(content);
    }


    private boolean shouldClear = false;

    /**
     * Sets up the buttons to click and display text in the calculations box
     */
    public void setUpLayout(View content) {

        int[] names = new int[] {
                R.id.button1, R.id.button2, R.id.button3,
                R.id.button4, R.id.button5, R.id.button6,
                R.id.button7, R.id.button8, R.id.button9,
                R.id.button0, R.id.buttonDecimal, R.id.buttonAdd,
                R.id.buttonSubtract, R.id.buttonMultiply, R.id.buttonDivide
        };

        // Equals button
        Button solve = (Button) content.findViewById(R.id.buttonEquals);
        solve.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // solve logic here
                try {
                    equation.setText(Logic.evaluate(equation.getText().toString()));
                } catch (SyntaxException e) {
                    equation.setText(syntaxError);
                }

                shouldClear = true;
            }
        });

        // buttons that insert text
        for (int i = 0; i < names.length; i++) {
            Button btn = (Button) content.findViewById(names[i]);
            if (btn != null) {
                btn.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {

                        String insert = ((Button) view).getText().toString();

                        if (shouldClear && Logic.isNumber(insert)) {
                            equation.setText(insert);
                        } else {
                            equation.append(insert);
                        }

                        shouldClear = false;
                    }
                });
            }
        }

        // clear button
        Button clear = (Button) content.findViewById(R.id.clear);
        clear.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                equation.setText("");
            }
        });

        // delete button
        ImageButton delete = (ImageButton) content.findViewById(R.id.delete);
        delete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (shouldClear) {
                    equation.setText("");
                } else {
                    String current = equation.getText().toString();
                    if (current.length() > 0) {
                        if (current.equals(syntaxError)) {
                            equation.setText("");
                        } else {
                            equation.setText(current.substring(0, current.length() - 1));
                        }
                    }
                }

                shouldClear = false;
            }
        });
    }
}