FreeCAD

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// SPDX-License-Identifier: LGPL-2.1-or-later
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/****************************************************************************
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 *                                                                          *
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 *   Copyright (c) 2024 The FreeCAD Project Association AISBL               *
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 *                                                                          *
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 *   This file is part of FreeCAD.                                          *
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 *                                                                          *
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 *   FreeCAD is free software: you can redistribute it and/or modify it     *
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 *   under the terms of the GNU Lesser General Public License as            *
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 *   published by the Free Software Foundation, either version 2.1 of the   *
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 *   License, or (at your option) any later version.                        *
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 *                                                                          *
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 *   FreeCAD is distributed in the hope that it will be useful, but         *
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 *   WITHOUT ANY WARRANTY; without even the implied warranty of             *
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU       *
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 *   Lesser General Public License for more details.                        *
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 *                                                                          *
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 *   You should have received a copy of the GNU Lesser General Public       *
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 *   License along with FreeCAD. If not, see                                *
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 *   <https://www.gnu.org/licenses/>.                                       *
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 *                                                                          *
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 ***************************************************************************/
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#include "PreCompiled.h"
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#ifndef _PreComp_
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#include <QGuiApplication>
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#include <QHBoxLayout>
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#include <QLabel>
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#include <QString>
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#include <QToolButton>
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#endif
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#include "ThemeSelectorWidget.h"
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#include <gsl/pointers>
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#include <App/Application.h>
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#include <Gui/Command.h>
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#include <Gui/PreferencePackManager.h>
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using namespace StartGui;
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ThemeSelectorWidget::ThemeSelectorWidget(QWidget* parent)
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    : QWidget(parent)
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    , _titleLabel {nullptr}
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    , _descriptionLabel {nullptr}
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    , _buttons {nullptr, nullptr, nullptr}
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{
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    setObjectName(QLatin1String("ThemeSelectorWidget"));
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    setupUi();
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    qApp->installEventFilter(this);
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}
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void ThemeSelectorWidget::setupButtons(QBoxLayout* layout)
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{
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    if (!layout) {
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        return;
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    }
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    std::map<Theme, QString> themeMap {{Theme::Classic, tr("FreeCAD Classic")},
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                                       {Theme::Dark, tr("FreeCAD Dark")},
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                                       {Theme::Light, tr("FreeCAD Light")}};
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    std::map<Theme, QIcon> iconMap {
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        {Theme::Classic, QIcon(QLatin1String(":/thumbnails/Theme_thumbnail_classic.png"))},
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        {Theme::Light, QIcon(QLatin1String(":/thumbnails/Theme_thumbnail_light.png"))},
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        {Theme::Dark, QIcon(QLatin1String(":/thumbnails/Theme_thumbnail_dark.png"))}};
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    auto hGrp = App::GetApplication().GetParameterGroupByPath(
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        "User parameter:BaseApp/Preferences/MainWindow");
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    auto styleSheetName = QString::fromStdString(hGrp->GetASCII("StyleSheet"));
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    for (const auto& theme : themeMap) {
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        auto button = gsl::owner<QToolButton*>(new QToolButton());
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        button->setCheckable(true);
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        button->setAutoExclusive(true);
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        button->setToolButtonStyle(Qt::ToolButtonStyle::ToolButtonTextUnderIcon);
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        button->setText(theme.second);
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        button->setIcon(iconMap[theme.first]);
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        button->setIconSize(iconMap[theme.first].actualSize(QSize(256, 256)));
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        if (theme.first == Theme::Classic && styleSheetName.isEmpty()) {
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            button->setChecked(true);
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        }
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        else if (theme.first == Theme::Light
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                 && styleSheetName.contains(QLatin1String("FreeCAD Light"),
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                                            Qt::CaseSensitivity::CaseInsensitive)) {
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            button->setChecked(true);
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        }
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        else if (theme.first == Theme::Dark
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                 && styleSheetName.contains(QLatin1String("FreeCAD Dark"),
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                                            Qt::CaseSensitivity::CaseInsensitive)) {
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            button->setChecked(true);
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        }
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        connect(button, &QToolButton::clicked, this, [this, theme] {
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            themeChanged(theme.first);
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        });
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        layout->addWidget(button);
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        _buttons[static_cast<int>(theme.first)] = button;
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    }
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}
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void ThemeSelectorWidget::setupUi()
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{
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    auto* outerLayout = gsl::owner<QVBoxLayout*>(new QVBoxLayout(this));
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    auto* buttonLayout = gsl::owner<QHBoxLayout*>(new QHBoxLayout);
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    _titleLabel = gsl::owner<QLabel*>(new QLabel);
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    _descriptionLabel = gsl::owner<QLabel*>(new QLabel);
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    outerLayout->addWidget(_titleLabel);
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    outerLayout->addLayout(buttonLayout);
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    outerLayout->addWidget(_descriptionLabel);
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    setupButtons(buttonLayout);
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    retranslateUi();
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    connect(_descriptionLabel, &QLabel::linkActivated, this, &ThemeSelectorWidget::onLinkActivated);
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}
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void ThemeSelectorWidget::onLinkActivated(const QString& link)
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{
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    auto const addonManagerLink = QStringLiteral("freecad:Std_AddonMgr");
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    if (link != addonManagerLink) {
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        return;
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    }
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    // Set the user preferences to include only preference packs.
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    // This is a quick and dirty way to open Addon Manager with only themes.
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    auto pref =
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        App::GetApplication().GetParameterGroupByPath("User parameter:BaseApp/Preferences/Addons");
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    pref->SetInt("PackageTypeSelection", 3);  // 3 stands for Preference Packs
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    pref->SetInt("StatusSelection", 0);       // 0 stands for any installation status
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    Gui::Application::Instance->commandManager().runCommandByName("Std_AddonMgr");
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}
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void ThemeSelectorWidget::themeChanged(Theme newTheme)
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{
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    // Run the appropriate preference pack:
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    auto prefPackManager = Gui::Application::Instance->prefPackManager();
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    switch (newTheme) {
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        case Theme::Classic:
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            prefPackManager->apply("FreeCAD Classic");
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            break;
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        case Theme::Dark:
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            prefPackManager->apply("FreeCAD Dark");
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            break;
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        case Theme::Light:
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            prefPackManager->apply("FreeCAD Light");
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            break;
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    }
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    ParameterGrp::handle hGrp =
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        App::GetApplication().GetParameterGroupByPath("User parameter:BaseApp/Preferences/Themes");
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    const unsigned long nonExistentColor = -1434171135;
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    const unsigned long defaultAccentColor = 1434171135;
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    unsigned long longAccentColor1 = hGrp->GetUnsigned("ThemeAccentColor1", nonExistentColor);
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    if (longAccentColor1 == nonExistentColor) {
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        hGrp->SetUnsigned("ThemeAccentColor1", defaultAccentColor);
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        hGrp->SetUnsigned("ThemeAccentColor2", defaultAccentColor);
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        hGrp->SetUnsigned("ThemeAccentColor3", defaultAccentColor);
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    }
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}
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bool ThemeSelectorWidget::eventFilter(QObject* object, QEvent* event)
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{
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    if (object == this && event->type() == QEvent::LanguageChange) {
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        this->retranslateUi();
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    }
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    return QWidget::eventFilter(object, event);
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}
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void ThemeSelectorWidget::retranslateUi()
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{
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    _titleLabel->setText(QLatin1String("<h2>") + tr("Theme") + QLatin1String("</h2>"));
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    _descriptionLabel->setText(tr("Looking for more themes? You can obtain them using "
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                                  "<a href=\"freecad:Std_AddonMgr\">Addon Manager</a>."));
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    _buttons[static_cast<int>(Theme::Dark)]->setText(tr("FreeCAD Dark", "Visual theme name"));
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    _buttons[static_cast<int>(Theme::Light)]->setText(tr("FreeCAD Light", "Visual theme name"));
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    _buttons[static_cast<int>(Theme::Classic)]->setText(tr("FreeCAD Classic", "Visual theme name"));
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}
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