fix: white screen and flicker

include/QCefSetting.h

@@ -14,6 +14,7 @@
 #pragma region qt_headers
 #include <QColor>
 #include <QScopedPointer>
+#include <QSize>
 #include <QString>
 #pragma endregion qt_headers
 
@@ -52,11 +53,23 @@ class QCEFVIEW_EXPORT QCefSetting
   /// </summary>
   ~QCefSetting();
 
+  /// <summary>
+  /// Sets the initial size of the browser
+  /// </summary>
+  /// <param name="size">The initial size</param>
+  void setInitSize(const QSize& size);
+
+  /// <summary>
+  /// Gets the initial size of the browser
+  /// </summary>
+  /// <returns></returns>
+  const QSize initSize() const;
+
   /// <summary>
   /// Sets the standard font family
   /// </summary>
   /// <param name="value">The font family</param>
-  void setStandardFontFamily(const QString value);
+  void setStandardFontFamily(const QString& value);
 
   /// <summary>
   /// Gets the standard font family

src/QCefSetting.cpp

@@ -30,7 +30,21 @@ QCefSetting::operator=(const QCefSetting& other)
 QCefSetting::~QCefSetting() {}
 
 void
-QCefSetting::setStandardFontFamily(const QString value)
+QCefSetting::setInitSize(const QSize& size)
+{
+  Q_D(QCefSetting);
+  d->initSize_ = size;
+}
+
+const QSize
+QCefSetting::initSize() const
+{
+  Q_D(const QCefSetting);
+  return d->initSize_;
+}
+
+void
+QCefSetting::setStandardFontFamily(const QString& value)
 {
   Q_D(QCefSetting);
   d->standardFontFamily_ = value.toStdString();

src/details/QCefSettingPrivate.h

@@ -30,6 +30,8 @@ class QCefSettingPrivate
 public:
   explicit QCefSettingPrivate();
 
+  QSize initSize_;
+
   std::string standardFontFamily_;
   std::string fixedFontFamily_;
   std::string serifFontFamily_;

src/details/QCefViewPrivate.cpp

@@ -89,14 +89,27 @@ QCefViewPrivate::createCefBrowser(QCefView* view, const QString& url, const QCef
     windowInfo.SetAsWindowless(0);
   } else {
     // create CEF browser parent window
+    auto initSize = q_ptr->size();
+    if (setting) {
+      initSize = setting->initSize();
+    }
+    qDebug() << "Browser init size:" << initSize;
+
     ncw.qBrowserWindow_ = new QCefWindow();
+    ncw.qBrowserWindow_->resize(initSize);
     ncw.qBrowserWindow_->setFlags(Qt::Window | Qt::FramelessWindowHint);
 
-    // use INT_MAX as the width and height to prevent black screen blink
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
+    qreal scaleFactor = q_ptr->devicePixelRatioF();
+#else
+    qreal scaleFactor = q_ptr->devicePixelRatio();
+#endif
+    auto width = initSize.width() * scaleFactor;
+    auto height = initSize.height() * scaleFactor;
 #if CEF_VERSION_MAJOR > 85
-    windowInfo.SetAsChild((CefWindowHandle)ncw.qBrowserWindow_->winId(), { 0, 0, INT_MAX, INT_MAX });
+    windowInfo.SetAsChild((CefWindowHandle)ncw.qBrowserWindow_->winId(), { 0, 0, (int)width, (int)height });
 #else
-    windowInfo.SetAsChild((CefWindowHandle)ncw.qBrowserWindow_->winId(), 0, 0, INT_MAX, INT_MAX);
+    windowInfo.SetAsChild((CefWindowHandle)ncw.qBrowserWindow_->winId(), 0, 0, (int)width, (int)height);
 #endif
   }
 
@@ -235,6 +248,7 @@ QCefViewPrivate::onCefBrowserCreated(CefRefPtr<CefBrowser> browser, QWindow* win
     ncw.qBrowserWindow_->applyMask(q_ptr->mask());
 
     // resize to eliminate flicker
+    qDebug() << "Host QCefView size:" << q_ptr->size();
     ncw.qBrowserWidget_->resize(q_ptr->size());
 
     // initialize the layout and add browser widget to the layout

src/details/QCefWindow.cpp

@@ -5,7 +5,6 @@
 QCefWindow::QCefWindow()
   : QWindow()
 {
-  this->setFlag(Qt::FramelessWindowHint);
 }
 
 QCefWindow::~QCefWindow()
@@ -43,7 +42,9 @@ QCefWindow::detachCefWindow()
 
 #else
     cefWindow_->hide();
+#if defined(Q_OS_LINUX)
     cefWindow_->setParent(nullptr);
+#endif
 #endif
     cefWindow_ = nullptr;
   }