From df074a9056bd426fd626c619e23bc5620a30c971 Mon Sep 17 00:00:00 2001
From: Hongfei Shang <shanghongfei@kylinos.cn>
Date: Sun, 19 Jun 2022 05:05:38 +0800
Subject: [PATCH] decoration: ukui title font dynamic update

---
 CMakeLists.txt                       |  4 ++++
 src/CMakeLists.txt                   |  2 ++
 src/decorations/decorationbridge.cpp | 26 ++++++++++++++++++++++++++
 src/decorations/decorationbridge.h   |  6 ++++++
 src/decorations/settings.cpp         |  9 +++++++++
 src/decorations/settings.h           |  3 +++
 6 files changed, 50 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7d8bc972d..d3ec2997c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,6 +29,10 @@ find_package(Qt5 ${QT_MIN_VERSION} CONFIG REQUIRED COMPONENTS
     X11Extras
 )
 
+find_package(PkgConfig)
+pkg_check_modules(Qsettings REQUIRED gsettings-qt)
+include_directories(${Qsettings_INCLUDE_DIRS})
+
 find_package(Qt5Test ${QT_MIN_VERSION} CONFIG QUIET)
 set_package_properties(Qt5Test PROPERTIES
     PURPOSE "Required for tests"
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 2cdd67bc2..1ade3cbbc 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -224,6 +224,8 @@ target_link_libraries(kwin
     epoxy::epoxy
 
     Threads::Threads
+
+    ${Qsettings_LIBRARIES}
 )
 
 add_subdirectory(backends)
diff --git a/src/decorations/decorationbridge.cpp b/src/decorations/decorationbridge.cpp
index 4139a09b7..cdd61aec7 100644
--- a/src/decorations/decorationbridge.cpp
+++ b/src/decorations/decorationbridge.cpp
@@ -33,6 +33,8 @@
 #include <QPainter>
 #include <QScreen>
 #include <QtDBus>
+#include <QGSettings>
+#include <QFontDatabase>
 
 namespace KWin
 {
@@ -153,11 +155,22 @@ void DecorationBridge::init()
     {
         m_themeId = 0;
     }
+
+    const QFont font = QFontDatabase::systemFont(QFontDatabase::TitleFont);
+    m_nFont = font.pointSize();
+    m_strFontFamily = font.family();
+
     QDBusConnection::sessionBus().connect(QString(),
                                           QStringLiteral("/KGlobalSettings"),
                                           QStringLiteral("org.kde.KGlobalSettings"),
                                           QStringLiteral("slotThemeChange"),
                                           this, SLOT(slotThemeUpdate(int)));
+
+    QDBusConnection::sessionBus().connect(QString(),
+                                          QStringLiteral("/KGlobalSettings"),
+                                          QStringLiteral("org.kde.KGlobalSettings"),
+                                          QStringLiteral("slotFontChange"),
+                                          this, SLOT(fontUpdate(int, QString)));
 }
 
 void DecorationBridge::slotThemeUpdate(int themeId)
@@ -165,6 +178,17 @@ void DecorationBridge::slotThemeUpdate(int themeId)
     m_themeId = themeId;
 }
 
+void DecorationBridge::fontUpdate(int nfont, QString strFamily)
+{
+    m_nFont = nfont;
+    m_strFontFamily = strFamily;
+    QFont font;
+    font.setPointSize(nfont);
+    font.setFamily(strFamily);
+
+    Q_EMIT sig_updateFont(font);
+}
+
 void DecorationBridge::initPlugin()
 {
     const KPluginMetaData metaData = KPluginMetaData::findPluginById(s_pluginName, m_plugin);
@@ -300,6 +324,8 @@ KDecoration2::Decoration *DecorationBridge::createDecoration(AbstractClient *cli
     }
     args.insert(QStringLiteral("dpi"), m_dpi);  //每创建一个渲染端，就把dpi值带过去，后面每新建一个客户就不需要反复获取获取dpi值
     args.insert(QStringLiteral("themeId"), m_themeId);  //针对UKUI定制的主题id
+    args.insert(QStringLiteral("systemFontSize"), m_nFont);     //标题栏字体大小
+    args.insert(QStringLiteral("systemFont"), m_strFontFamily); //标题栏字体类型
     auto deco = m_factory->create<KDecoration2::Decoration>(client, QVariantList({args}));
     deco->setSettings(m_settings);
     deco->init();
diff --git a/src/decorations/decorationbridge.h b/src/decorations/decorationbridge.h
index c71da0e84..9d1b54bca 100644
--- a/src/decorations/decorationbridge.h
+++ b/src/decorations/decorationbridge.h
@@ -66,8 +66,11 @@ public:
 
 Q_SIGNALS:
     void metaDataLoaded();
+    void sig_updateFont(QFont);
+
 public Q_SLOTS:
     void slotThemeUpdate(int);
+    void fontUpdate(int nfont, QString strFamily);
 
 private:
     QString readPlugin();
@@ -88,6 +91,9 @@ private:
 
     int m_dpi;          //dpi值
     int m_themeId;      //主题id
+    int m_nFont;
+    QString m_strFontFamily;
+
     KWIN_SINGLETON(DecorationBridge)
 };
 } // Decoration
diff --git a/src/decorations/settings.cpp b/src/decorations/settings.cpp
index e493da6bc..0fe0f51a2 100644
--- a/src/decorations/settings.cpp
+++ b/src/decorations/settings.cpp
@@ -49,6 +49,7 @@ SettingsImpl::SettingsImpl(KDecoration2::DecorationSettings *parent)
     );
     connect(Workspace::self(), &Workspace::configChanged, this, &SettingsImpl::readSettings);
     connect(DecorationBridge::self(), &DecorationBridge::metaDataLoaded, this, &SettingsImpl::readSettings);
+    connect(DecorationBridge::self(), &DecorationBridge::sig_updateFont, this, &SettingsImpl::updateFont);
 }
 
 SettingsImpl::~SettingsImpl() = default;
@@ -142,6 +143,14 @@ static KDecoration2::BorderSize stringToSize(const QString &name)
     return it.value();
 }
 
+void SettingsImpl::updateFont(QFont font)
+{
+    if (font != m_font) {
+        m_font = font;
+        Q_EMIT decorationSettings()->fontChanged(m_font);
+    }
+}
+
 void SettingsImpl::readSettings()
 {
     KConfigGroup config = kwinApp()->config()->group(QStringLiteral("org.kde.kdecoration2"));
diff --git a/src/decorations/settings.h b/src/decorations/settings.h
index 250447f05..d12b79971 100644
--- a/src/decorations/settings.h
+++ b/src/decorations/settings.h
@@ -42,6 +42,9 @@ public:
         return m_font;
     }
 
+public Q_SLOTS:
+    void updateFont(QFont font);
+
 private:
     void readSettings();
     QVector< KDecoration2::DecorationButtonType > readDecorationButtons(const KConfigGroup &config,