Style Sheet Example

/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, 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.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <QtWidgets>

#include "stylesheeteditor.h"

StyleSheetEditor::StyleSheetEditor(QWidget *parent)
    : QDialog(parent)
{
    ui.setupUi(this);

    QRegularExpression regExp("^.(.*)\\+?Style$");
    QString defaultStyle = QApplication::style()->metaObject()->className();
    QRegularExpressionMatch match = regExp.match(defaultStyle);

    if (match.hasMatch())
        defaultStyle = match.captured(1);

    ui.styleCombo->addItems(QStyleFactory::keys());
    ui.styleCombo->setCurrentIndex(ui.styleCombo->findText(defaultStyle, Qt::MatchContains));
    ui.styleSheetCombo->setCurrentIndex(ui.styleSheetCombo->findText("Coffee"));
    loadStyleSheet("Coffee");
}

void StyleSheetEditor::on_styleCombo_activated(const QString &styleName)
{
    qApp->setStyle(styleName);
    ui.applyButton->setEnabled(false);
}

void StyleSheetEditor::on_styleSheetCombo_activated(const QString &sheetName)
{
    loadStyleSheet(sheetName);
}

void StyleSheetEditor::on_styleTextEdit_textChanged()
{
    ui.applyButton->setEnabled(true);
}

void StyleSheetEditor::on_applyButton_clicked()
{
    qApp->setStyleSheet(ui.styleTextEdit->toPlainText());
    ui.applyButton->setEnabled(false);
}

void StyleSheetEditor::loadStyleSheet(const QString &sheetName)
{
    QFile file(":/qss/" + sheetName.toLower() + ".qss");
    file.open(QFile::ReadOnly);
    QString styleSheet = QString::fromLatin1(file.readAll());

    ui.styleTextEdit->setPlainText(styleSheet);
    qApp->setStyleSheet(styleSheet);
    ui.applyButton->setEnabled(false);
}