- Qt 5.5
- Qt Widgets
- Line Edits Example
- window.cpp Example File
- Qt 5.5.1 Reference Documentation

# window.cpp Example File

widgets/lineedits/window.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
    **   * Redistributions in binary form must reproduce the above copyright
    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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    #include <QtWidgets>

    #include "window.h"

    Window::Window()
    {
        QGroupBox *echoGroup = new QGroupBox(tr("Echo"));

        QLabel *echoLabel = new QLabel(tr("Mode:"));
        QComboBox *echoComboBox = new QComboBox;
        echoComboBox->addItem(tr("Normal"));
        echoComboBox->addItem(tr("Password"));
        echoComboBox->addItem(tr("PasswordEchoOnEdit"));
        echoComboBox->addItem(tr("No Echo"));

        echoLineEdit = new QLineEdit;
        echoLineEdit->setPlaceholderText("Placeholder Text");
        echoLineEdit->setFocus();

        QGroupBox *validatorGroup = new QGroupBox(tr("Validator"));

        QLabel *validatorLabel = new QLabel(tr("Type:"));
        QComboBox *validatorComboBox = new QComboBox;
        validatorComboBox->addItem(tr("No validator"));
        validatorComboBox->addItem(tr("Integer validator"));
        validatorComboBox->addItem(tr("Double validator"));

        validatorLineEdit = new QLineEdit;
        validatorLineEdit->setPlaceholderText("Placeholder Text");

        QGroupBox *alignmentGroup = new QGroupBox(tr("Alignment"));

        QLabel *alignmentLabel = new QLabel(tr("Type:"));
        QComboBox *alignmentComboBox = new QComboBox;
        alignmentComboBox->addItem(tr("Left"));
        alignmentComboBox->addItem(tr("Centered"));
        alignmentComboBox->addItem(tr("Right"));

        alignmentLineEdit = new QLineEdit;
        alignmentLineEdit->setPlaceholderText("Placeholder Text");

        QGroupBox *inputMaskGroup = new QGroupBox(tr("Input mask"));

        QLabel *inputMaskLabel = new QLabel(tr("Type:"));
        QComboBox *inputMaskComboBox = new QComboBox;
        inputMaskComboBox->addItem(tr("No mask"));
        inputMaskComboBox->addItem(tr("Phone number"));
        inputMaskComboBox->addItem(tr("ISO date"));
        inputMaskComboBox->addItem(tr("License key"));

        inputMaskLineEdit = new QLineEdit;
        inputMaskLineEdit->setPlaceholderText("Placeholder Text");

        QGroupBox *accessGroup = new QGroupBox(tr("Access"));

        QLabel *accessLabel = new QLabel(tr("Read-only:"));
        QComboBox *accessComboBox = new QComboBox;
        accessComboBox->addItem(tr("False"));
        accessComboBox->addItem(tr("True"));

        accessLineEdit = new QLineEdit;
        accessLineEdit->setPlaceholderText("Placeholder Text");

        connect(echoComboBox, SIGNAL(activated(int)),
                this, SLOT(echoChanged(int)));
        connect(validatorComboBox, SIGNAL(activated(int)),
                this, SLOT(validatorChanged(int)));
        connect(alignmentComboBox, SIGNAL(activated(int)),
                this, SLOT(alignmentChanged(int)));
        connect(inputMaskComboBox, SIGNAL(activated(int)),
                this, SLOT(inputMaskChanged(int)));
        connect(accessComboBox, SIGNAL(activated(int)),
                this, SLOT(accessChanged(int)));

        QGridLayout *echoLayout = new QGridLayout;
        echoLayout->addWidget(echoLabel, 0, 0);
        echoLayout->addWidget(echoComboBox, 0, 1);
        echoLayout->addWidget(echoLineEdit, 1, 0, 1, 2);
        echoGroup->setLayout(echoLayout);

        QGridLayout *validatorLayout = new QGridLayout;
        validatorLayout->addWidget(validatorLabel, 0, 0);
        validatorLayout->addWidget(validatorComboBox, 0, 1);
        validatorLayout->addWidget(validatorLineEdit, 1, 0, 1, 2);
        validatorGroup->setLayout(validatorLayout);

        QGridLayout *alignmentLayout = new QGridLayout;
        alignmentLayout->addWidget(alignmentLabel, 0, 0);
        alignmentLayout->addWidget(alignmentComboBox, 0, 1);
        alignmentLayout->addWidget(alignmentLineEdit, 1, 0, 1, 2);
        alignmentGroup-> setLayout(alignmentLayout);

        QGridLayout *inputMaskLayout = new QGridLayout;
        inputMaskLayout->addWidget(inputMaskLabel, 0, 0);
        inputMaskLayout->addWidget(inputMaskComboBox, 0, 1);
        inputMaskLayout->addWidget(inputMaskLineEdit, 1, 0, 1, 2);
        inputMaskGroup->setLayout(inputMaskLayout);

        QGridLayout *accessLayout = new QGridLayout;
        accessLayout->addWidget(accessLabel, 0, 0);
        accessLayout->addWidget(accessComboBox, 0, 1);
        accessLayout->addWidget(accessLineEdit, 1, 0, 1, 2);
        accessGroup->setLayout(accessLayout);

        QGridLayout *layout = new QGridLayout;
        layout->addWidget(echoGroup, 0, 0);
        layout->addWidget(validatorGroup, 1, 0);
        layout->addWidget(alignmentGroup, 2, 0);
        layout->addWidget(inputMaskGroup, 0, 1);
        layout->addWidget(accessGroup, 1, 1);
        setLayout(layout);

        setWindowTitle(tr("Line Edits"));
    }

    void Window::echoChanged(int index)
    {
        switch (index) {
        case 0:
            echoLineEdit->setEchoMode(QLineEdit::Normal);
            break;
        case 1:
            echoLineEdit->setEchoMode(QLineEdit::Password);
            break;
        case 2:
            echoLineEdit->setEchoMode(QLineEdit::PasswordEchoOnEdit);
            break;
        case 3:
            echoLineEdit->setEchoMode(QLineEdit::NoEcho);
        }
    }

    void Window::validatorChanged(int index)
    {
        switch (index) {
        case 0:
            validatorLineEdit->setValidator(0);
            break;
        case 1:
            validatorLineEdit->setValidator(new QIntValidator(
                validatorLineEdit));
            break;
        case 2:
            validatorLineEdit->setValidator(new QDoubleValidator(-999.0,
                999.0, 2, validatorLineEdit));
        }

        validatorLineEdit->clear();
    }

    void Window::alignmentChanged(int index)
    {
        switch (index) {
        case 0:
            alignmentLineEdit->setAlignment(Qt::AlignLeft);
            break;
        case 1:
            alignmentLineEdit->setAlignment(Qt::AlignCenter);
            break;
        case 2:
            alignmentLineEdit->setAlignment(Qt::AlignRight);
        }
    }

    void Window::inputMaskChanged(int index)
    {
        switch (index) {
        case 0:
            inputMaskLineEdit->setInputMask("");
            break;
        case 1:
            inputMaskLineEdit->setInputMask("+99 99 99 99 99;_");
            break;
        case 2:
            inputMaskLineEdit->setInputMask("0000-00-00");
            inputMaskLineEdit->setText("00000000");
            inputMaskLineEdit->setCursorPosition(0);
            break;
        case 3:
            inputMaskLineEdit->setInputMask(">AAAAA-AAAAA-AAAAA-AAAAA-AAAAA;#");
        }
    }

    void Window::accessChanged(int index)
    {
        switch (index) {
        case 0:
            accessLineEdit->setReadOnly(false);
            break;
        case 1:
            accessLineEdit->setReadOnly(true);
        }
    }