widget: add support for changing title font

Not needed for Qt Quick, because you can easily to change it:

```qml
StandardTitleBar {
    titleLabel {
        font {
            family: "Arial"
            pointSize: 10
            italic: true
        }
    }
}
```

Signed-off-by: Yuhang Zhao <2546789017@qq.com>

CMakeLists.txt

@@ -25,7 +25,7 @@
 cmake_minimum_required(VERSION 3.20)
 
 project(FramelessHelper
-    VERSION 2.2.1.0
+    VERSION 2.3.0.0
     DESCRIPTION "Cross-platform window customization framework for Qt Widgets and Qt Quick."
     HOMEPAGE_URL "https://github.com/wangwenx190/framelesshelper/"
     LANGUAGES CXX

include/FramelessHelper/Core/private/registrykey_p.h

@@ -41,8 +41,13 @@
 #  endif // ((QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)) && !REGISTRYKEY_FORCE_QSETTINGS)
 #endif // REGISTRYKEY_IMPL
 
+#ifndef REGISTRYKEY_QWINREGISTRYKEY
 #  define REGISTRYKEY_QWINREGISTRYKEY ((REGISTRYKEY_IMPL) == 1)
+#endif // REGISTRYKEY_QWINREGISTRYKEY
+
+#ifndef REGISTRYKEY_QSETTINGS
 #  define REGISTRYKEY_QSETTINGS ((REGISTRYKEY_IMPL) == 2)
+#endif // REGISTRYKEY_QSETTINGS
 
 QT_BEGIN_NAMESPACE
 class QWinRegistryKey;

include/FramelessHelper/Widgets/private/standardtitlebar_p.h

@@ -28,6 +28,7 @@
 #include "standardtitlebar.h"
 #include <QtCore/qobject.h>
 #include <QtCore/qpointer.h>
+#include <optional>
 
 QT_BEGIN_NAMESPACE
 class QPaintEvent;
@@ -73,6 +74,9 @@ public:
     Q_NODISCARD bool windowIconVisible() const;
     void setWindowIconVisible(const bool value);
 
+    Q_NODISCARD QFont titleFont() const;
+    void setTitleFont(const QFont &value);
+
 public Q_SLOTS:
     void updateMaximizeButton();
     void updateTitleBarColor();
@@ -98,6 +102,7 @@ private:
     bool m_titleLabelVisible = true;
     QSize m_windowIconSize = {};
     bool m_windowIconVisible = false;
+    std::optional<QFont> m_titleFont = std::nullopt;
 };
 
 FRAMELESSHELPER_END_NAMESPACE

include/FramelessHelper/Widgets/standardtitlebar.h

@@ -51,6 +51,7 @@ class FRAMELESSHELPER_WIDGETS_API StandardTitleBar : public QWidget
     Q_PROPERTY(bool titleLabelVisible READ titleLabelVisible WRITE setTitleLabelVisible NOTIFY titleLabelVisibleChanged FINAL)
     Q_PROPERTY(QSize windowIconSize READ windowIconSize WRITE setWindowIconSize NOTIFY windowIconSizeChanged FINAL)
     Q_PROPERTY(bool windowIconVisible READ windowIconVisible WRITE setWindowIconVisible NOTIFY windowIconVisibleChanged FINAL)
+    Q_PROPERTY(QFont titleFont READ titleFont WRITE setTitleFont NOTIFY titleFontChanged FINAL)
 
 public:
     explicit StandardTitleBar(QWidget *parent = nullptr);
@@ -80,6 +81,9 @@ public:
     Q_NODISCARD bool windowIconVisible() const;
     void setWindowIconVisible(const bool value);
 
+    Q_NODISCARD QFont titleFont() const;
+    void setTitleFont(const QFont &value);
+
 protected:
     void paintEvent(QPaintEvent *event) override;
 
@@ -90,6 +94,7 @@ Q_SIGNALS:
     void titleLabelVisibleChanged();
     void windowIconSizeChanged();
     void windowIconVisibleChanged();
+    void titleFontChanged();
 
 private:
     QScopedPointer<StandardTitleBarPrivate> d_ptr;

qmake/inc/core/framelesshelper.version

@@ -34,10 +34,10 @@
 #pragma once
 
 [[maybe_unused]] static constexpr const int FRAMELESSHELPER_VERSION_MAJOR = 2;
-[[maybe_unused]] static constexpr const int FRAMELESSHELPER_VERSION_MINOR = 2;
+[[maybe_unused]] static constexpr const int FRAMELESSHELPER_VERSION_MINOR = 3;
-[[maybe_unused]] static constexpr const int FRAMELESSHELPER_VERSION_PATCH = 1;
+[[maybe_unused]] static constexpr const int FRAMELESSHELPER_VERSION_PATCH = 0;
 [[maybe_unused]] static constexpr const int FRAMELESSHELPER_VERSION_TWEAK = 0;
-[[maybe_unused]] static constexpr const char FRAMELESSHELPER_VERSION_STR[] = "2.2.1.0\0";
+[[maybe_unused]] static constexpr const char FRAMELESSHELPER_VERSION_STR[] = "2.3.0.0\0";
 [[maybe_unused]] static constexpr const char FRAMELESSHELPER_COMMIT_STR[] = "UNKNOWN\0";
 [[maybe_unused]] static constexpr const char FRAMELESSHELPER_COMPILE_DATETIME_STR[] = "UNKNOWN\0";
 

src/widgets/standardtitlebar.cpp

@@ -154,13 +154,12 @@ void StandardTitleBarPrivate::paintTitleBar(QPaintEvent *event)
     if (m_titleLabelVisible) {
         const QString text = m_window->windowTitle();
         if (!text.isEmpty()) {
-            const QFont font = [q]() -> QFont {
+            painter.setPen(foregroundColor);
+            painter.setFont(m_titleFont.value_or([q]() -> QFont {
                 QFont f = q->font();
                 f.setPointSize(kDefaultTitleBarFontPointSize);
                 return f;
-            }();
+            }()));
-            painter.setPen(foregroundColor);
-            painter.setFont(font);
             const QRect rect = [this, q, titleLabelLeftOffset]() -> QRect {
                 const int w = q->width();
                 int leftMargin = 0;
@@ -235,6 +234,22 @@ void StandardTitleBarPrivate::setWindowIconVisible(const bool value)
     Q_EMIT q->windowIconVisibleChanged();
 }
 
+QFont StandardTitleBarPrivate::titleFont() const
+{
+    return m_titleFont.value_or(QFont());
+}
+
+void StandardTitleBarPrivate::setTitleFont(const QFont &value)
+{
+    if (titleFont() == value) {
+        return;
+    }
+    m_titleFont = value;
+    Q_Q(StandardTitleBar);
+    q->update();
+    Q_EMIT q->titleFontChanged();
+}
+
 void StandardTitleBarPrivate::updateMaximizeButton()
 {
     const bool max = m_window->isMaximized();
@@ -478,6 +493,18 @@ void StandardTitleBar::setWindowIconVisible(const bool value)
     d->setWindowIconVisible(value);
 }
 
+QFont StandardTitleBar::titleFont() const
+{
+    Q_D(const StandardTitleBar);
+    return d->titleFont();
+}
+
+void StandardTitleBar::setTitleFont(const QFont &value)
+{
+    Q_D(StandardTitleBar);
+    d->setTitleFont(value);
+}
+
 void StandardTitleBar::paintEvent(QPaintEvent *event)
 {
     Q_D(StandardTitleBar);