basic theme changing

core/main.cpp

@@ -89,6 +89,15 @@ int main(int argc, char *argv[])
     
     new Shared::Global();        //translates enums
 
+    QSettings settings;
+    QVariant vtheme = settings.value("theme");
+    if (vtheme.isValid()) {
+        QString theme = vtheme.toString().toLower();
+        if (theme != "system") {
+            QApplication::setStyle(theme);
+        }
+    }
+    
     Squawk w;
     w.show();
     

shared/global.cpp

@@ -84,6 +84,7 @@ Shared::Global::Global():
         tr("Squawk is going to query you for the password on every start of the program", "AccountPasswordDescription"),
         tr("Your password is going to be stored in KDE wallet storage (KWallet). You're going to be queried for permissions", "AccountPasswordDescription")
     }),
+    defaultSystemStyle(QApplication::style()->objectName()),
     pluginSupport({
         {"KWallet", false},
         {"openFileManagerWindowJob", false}

shared/global.h

@@ -27,7 +27,8 @@
 #include <set>
 #include <deque>
 
-#include <QCoreApplication>
+#include <QApplication>
+#include <QStyle>
 #include <QDebug>
 #include <QMimeType>
 #include <QMimeDatabase>
@@ -85,6 +86,8 @@ namespace Shared {
         
         const std::deque<QString> accountPasswordDescription;
 
+        const QString defaultSystemStyle;
+        
         static bool supported(const QString& pluginName);
         static void setSupported(const QString& pluginName, bool support);
         

ui/widgets/settings/pageappearance.cpp

@@ -1,13 +1,42 @@
 #include "pageappearance.h"
 #include "ui_pageappearance.h"
 
+#include <QDebug>
+
 PageAppearance::PageAppearance(QWidget* parent):
     QWidget(parent),
-    m_ui(new Ui::PageAppearance())
+    m_ui(new Ui::PageAppearance()),
+    styles()
 {
     m_ui->setupUi(this);
+
+    m_ui->themeInput->addItem(tr("System"));
+    styles.push_back("system");
+    QStringList themes = QStyleFactory::keys();
+    for (const QString& key : themes) {
+        m_ui->themeInput->addItem(key);
+        styles.push_back(key);
+    }
+
+    QSettings settings;
+    QVariant vtheme = settings.value("theme");
+    if (vtheme.isValid()) {
+        QString theme = vtheme.toString();
+        m_ui->themeInput->setCurrentText(theme);
+    } else {
+        m_ui->themeInput->setCurrentText("System");
+    }
+
+    connect(m_ui->themeInput, qOverload<int>(&QComboBox::currentIndexChanged), this, &PageAppearance::onThemeChanged);
 }
 
 PageAppearance::~PageAppearance()
 {
 }
+
+void PageAppearance::onThemeChanged(int index)
+{
+    if (index >= 0) {
+        emit variableModified("theme", styles[index]);
+    }
+}

ui/widgets/settings/pageappearance.h

@@ -3,6 +3,10 @@
 
 #include <QWidget>
 #include <QScopedPointer>
+#include <QStyleFactory>
+#include <QVariant>
+#include <QSettings>
+#include <vector>
 
 namespace Ui
 {
@@ -19,8 +23,15 @@ public:
     PageAppearance(QWidget* parent = nullptr);
     ~PageAppearance();
 
+signals:
+    void variableModified(const QString& key, const QVariant& value);
+
+protected slots:
+    void onThemeChanged(int index);
+
 private:
     QScopedPointer<Ui::PageAppearance> m_ui;
+    std::vector<QString> styles;
 };
 
 #endif // PAGEAPPEARANCE_H

ui/widgets/settings/pagegeneral.h

@@ -3,6 +3,7 @@
 
 #include <QWidget>
 #include <QScopedPointer>
+#include <QVariant>
 
 namespace Ui
 {
@@ -19,6 +20,9 @@ public:
     PageGeneral(QWidget* parent = nullptr);
     ~PageGeneral();
 
+signals:
+    void variableModified(const QString& key, const QVariant& value);
+
 private:
     QScopedPointer<Ui::PageGeneral> m_ui;
 };

ui/widgets/settings/settings.cpp

@@ -3,11 +3,19 @@
 
 Settings::Settings(QWidget* parent):
     QWidget(parent),
-    m_ui(new Ui::Settings())
+    m_ui(new Ui::Settings()),
+    modifiedSettings()
 {
     m_ui->setupUi(this);
 
     connect(m_ui->list, &QListWidget::currentItemChanged, this, &Settings::onCurrentPageChanged);
+
+    connect(m_ui->General, &PageGeneral::variableModified, this, &Settings::onVariableModified);
+    connect(m_ui->Appearance, &PageAppearance::variableModified, this, &Settings::onVariableModified);
+
+    connect(m_ui->applyButton, &QPushButton::clicked, this, &Settings::apply);
+    connect(m_ui->okButton, &QPushButton::clicked, this, &Settings::confirm);
+    connect(m_ui->cancelButton, &QPushButton::clicked, this, &Settings::close);
 }
 
 Settings::~Settings()
@@ -22,3 +30,33 @@ void Settings::onCurrentPageChanged(QListWidgetItem* current)
         m_ui->content->setCurrentIndex(m_ui->list->currentRow());
     }
 }
+
+void Settings::onVariableModified(const QString& key, const QVariant& value)
+{
+    modifiedSettings[key] = value;
+}
+
+void Settings::apply()
+{
+    QSettings settings;
+    for (const std::pair<const QString, QVariant>& pair: modifiedSettings) {
+        if (pair.first == "theme") {
+            QString theme = pair.second.toString();
+            if (theme.toLower() == "system") {
+                QApplication::setStyle(Shared::Global::getInstance()->defaultSystemStyle);
+            } else {
+                QApplication::setStyle(theme);
+            }
+        }
+
+        settings.setValue(pair.first, pair.second);
+    }
+
+    modifiedSettings.clear();
+}
+
+void Settings::confirm()
+{
+    apply();
+    close();
+}

ui/widgets/settings/settings.h

@@ -4,6 +4,9 @@
 #include <QWidget>
 #include <QListWidgetItem>
 #include <QScopedPointer>
+#include <QSettings>
+
+#include "shared/global.h"
 
 namespace Ui
 {
@@ -20,11 +23,17 @@ public:
     Settings(QWidget* parent = nullptr);
     ~Settings();
 
+public slots:
+    void apply();
+    void confirm();
+
 protected slots:
     void onCurrentPageChanged(QListWidgetItem* current);
+    void onVariableModified(const QString& key, const QVariant& value);
 
 private:
     QScopedPointer<Ui::Settings> m_ui;
+    std::map<QString, QVariant> modifiedSettings;
 };
 
 #endif // SETTINGS_H