Switch to std::function for resize callback

include/panda_qt/screen.hpp

@@ -1,5 +1,6 @@
 #pragma once
 #include <QWidget>
+#include <functional>
 #include <memory>
 
 #include "gl/context.h"
@@ -10,7 +11,9 @@ class ScreenWidget : public QWidget {
 	Q_OBJECT
 
   public:
-	ScreenWidget(QWidget* parent = nullptr);
+	using ResizeCallback = std::function<void(u32, u32)>;
+
+	ScreenWidget(ResizeCallback resizeCallback, QWidget* parent = nullptr);
 	void resizeEvent(QResizeEvent* event) override;
 	// Called by the emulator thread for resizing the actual GL surface, since the emulator thread owns the GL context
 	void resizeSurface(u32 width, u32 height);
@@ -28,6 +31,8 @@ class ScreenWidget : public QWidget {
 
   private:
 	std::unique_ptr<GL::Context> glContext = nullptr;
+	ResizeCallback resizeCallback;
+
 	bool createGLContext();
 
 	qreal devicePixelRatioFromScreen() const;

src/panda_qt/main_window.cpp

@@ -17,7 +17,8 @@ MainWindow::MainWindow(QApplication* app, QWidget* parent) : QMainWindow(parent)
 	setAcceptDrops(true);
 	resize(800, 240 * 4);
 
-	screen = new ScreenWidget(this);
+	// We pass a callback to the screen widget that will be triggered every time we resize the screen
+	screen = new ScreenWidget([this](u32 width, u32 height) { handleScreenResize(width, height); }, this);
 	setCentralWidget(screen);
 
 	screen->show();

src/panda_qt/screen.cpp

@@ -20,7 +20,7 @@
 // and https://github.com/melonDS-emu/melonDS/blob/master/src/frontend/qt_sdl/main.cpp
 
 #ifdef PANDA3DS_ENABLE_OPENGL
-ScreenWidget::ScreenWidget(QWidget* parent) : QWidget(parent) {
+ScreenWidget::ScreenWidget(ResizeCallback resizeCallback, QWidget* parent) : QWidget(parent), resizeCallback(resizeCallback) {
 	// Create a native window for use with our graphics API of choice
 	resize(800, 240 * 4);
 	
@@ -49,7 +49,7 @@ void ScreenWidget::resizeEvent(QResizeEvent* event) {
 	}
 
 	// This will call take care of calling resizeSurface from the emulator thread
-	static_cast<MainWindow*>(parentWidget())->handleScreenResize(surfaceWidth, surfaceHeight);
+	resizeCallback(surfaceWidth, surfaceHeight);
 }
 
 // Note: This will run on the emulator thread, we don't want any Qt calls happening there.