org.catrobat.catroid.ui.dialogs.TextDialog.java Source code

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Here is the source code for org.catrobat.catroid.ui.dialogs.TextDialog.java

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/*
 * Catroid: An on-device visual programming system for Android devices
 * Copyright (C) 2010-2015 The Catrobat Team
 * (<http://developer.catrobat.org/credits>)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * An additional term exception under section 7 of the GNU Affero
 * General Public License, version 3, is available at
 * http://developer.catrobat.org/license_additional_term
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.catrobat.catroid.ui.dialogs;

import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.DialogInterface.OnKeyListener;
import android.content.DialogInterface.OnShowListener;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.WindowManager;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import org.catrobat.catroid.R;

/**
 * Simple dialog for entering text with ok and cancel button will not permit to
 * enter empty strings you have to implement the key listener in the subclass.
 */
public abstract class TextDialog extends DialogFragment {

    protected EditText input;
    protected TextView inputTitle;

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        View dialogView = LayoutInflater.from(getActivity()).inflate(R.layout.dialog_text_dialog, null);
        input = (EditText) dialogView.findViewById(R.id.dialog_text_edit_text);
        inputTitle = (TextView) dialogView.findViewById(R.id.dialog_text_text_view);

        if (getHint() != null) {
            input.setHint(getHint());
        }

        input.setOnFocusChangeListener(new View.OnFocusChangeListener() {
            @Override
            public void onFocusChange(View view, boolean hasFocus) {
                if (hasFocus) {
                    getDialog().getWindow()
                            .setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
                }
            }
        });

        initialize();

        Dialog dialog = new AlertDialog.Builder(getActivity()).setView(dialogView).setTitle(getTitle())
                .setNegativeButton(R.string.cancel_button, new OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dismiss();
                    }
                }).setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                    }
                }).create();

        dialog.setOnKeyListener(new OnKeyListener() {
            @Override
            public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
                if (event.getAction() == KeyEvent.ACTION_DOWN && keyCode == KeyEvent.KEYCODE_ENTER) {
                    boolean okButtonResult = handleOkButton();
                    onOkButtonHandled();
                    if (okButtonResult) {
                        dismiss();
                    }
                    return okButtonResult;
                }

                return false;
            }
        });

        dialog.setCanceledOnTouchOutside(true);
        dialog.setOnShowListener(new OnShowListener() {
            @Override
            public void onShow(DialogInterface dialog) {
                Button buttonPositive = ((AlertDialog) getDialog()).getButton(DialogInterface.BUTTON_POSITIVE);
                buttonPositive.setEnabled(getPositiveButtonEnabled());

                setPositiveButtonClickCustomListener();

                InputMethodManager inputManager = (InputMethodManager) getActivity()
                        .getSystemService(Context.INPUT_METHOD_SERVICE);
                inputManager.showSoftInput(input, InputMethodManager.SHOW_IMPLICIT);

                initTextChangedListener();
            }
        });

        return dialog;
    }

    protected abstract void initialize();

    protected abstract boolean handleOkButton();

    protected abstract String getTitle();

    protected abstract String getHint();

    protected void onOkButtonHandled() {
    }

    protected TextWatcher getInputTextChangedListener(final Button buttonPositive) {
        return new TextWatcher() {
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                if (s.length() == 0) {
                    buttonPositive.setEnabled(false);
                } else {
                    buttonPositive.setEnabled(true);
                }
            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }

            @Override
            public void afterTextChanged(Editable s) {
            }
        };
    }

    protected boolean getPositiveButtonEnabled() {
        if (input.length() == 0) {
            return false;
        }

        return true;
    }

    private void initTextChangedListener() {
        final Button buttonPositive = ((AlertDialog) getDialog()).getButton(DialogInterface.BUTTON_POSITIVE);
        input.addTextChangedListener(getInputTextChangedListener(buttonPositive));
    }

    /**
     * This method overrides standart AlertDialog's positive button click listener to prevent dialog dismissing.
     */
    private void setPositiveButtonClickCustomListener() {
        Button buttonPositive = ((AlertDialog) getDialog()).getButton(DialogInterface.BUTTON_POSITIVE);
        buttonPositive.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                boolean okButtonResult = handleOkButton();
                onOkButtonHandled();

                if (okButtonResult) {
                    dismiss();
                }
            }
        });
    }
}