Qt: Implement drag/drop to main window

pcsx2-qt/MainWindow.cpp

@@ -990,26 +990,12 @@ void MainWindow::onGameListEntryContextMenuRequested(const QPoint& point)
 
 void MainWindow::onStartFileActionTriggered()
 {
-	QString filename =
+	QString path =
 		QDir::toNativeSeparators(QFileDialog::getOpenFileName(this, tr("Select Disc Image"), QString(), tr(DISC_IMAGE_FILTER), nullptr));
-	if (filename.isEmpty())
+	if (path.isEmpty())
 		return;
 
-	std::shared_ptr<VMBootParameters> params = std::make_shared<VMBootParameters>();
-	params->filename = filename.toStdString();
-
-	// we might still be saving a resume state...
-	VMManager::WaitForSaveStateFlush();
-
-	const std::optional<bool> resume(
-		promptForResumeState(
-			QString::fromStdString(VMManager::GetSaveStateFileName(params->filename.c_str(), -1))));
-	if (!resume.has_value())
-		return;
-	else if (resume.value())
-		params->state_index = -1;
-
-	g_emu_thread->startVM(std::move(params));
+	doStartDisc(path);
 }
 
 void MainWindow::onStartBIOSActionTriggered()
@@ -1392,6 +1378,59 @@ void MainWindow::closeEvent(QCloseEvent* event)
 	QMainWindow::closeEvent(event);
 }
 
+static QString getFilenameFromMimeData(const QMimeData* md)
+{
+	QString filename;
+	if (md->hasUrls())
+	{
+		// only one url accepted
+		const QList<QUrl> urls(md->urls());
+		if (urls.size() == 1)
+			filename = urls.front().toLocalFile();
+	}
+
+	return filename;
+}
+
+void MainWindow::dragEnterEvent(QDragEnterEvent* event)
+{
+	const std::string filename(getFilenameFromMimeData(event->mimeData()).toStdString());
+
+	// allow save states being dragged in
+	if (!VMManager::IsLoadableFileName(filename) && !VMManager::IsSaveStateFileName(filename))
+		return;
+
+	event->acceptProposedAction();
+}
+
+void MainWindow::dropEvent(QDropEvent* event)
+{
+	const QString filename(getFilenameFromMimeData(event->mimeData()));
+	const std::string filename_str(filename.toStdString());
+	if (VMManager::IsSaveStateFileName(filename_str))
+	{
+		// can't load a save state without a current VM 
+		if (m_vm_valid)
+		{
+			event->acceptProposedAction();
+			g_emu_thread->loadState(filename);
+		}
+		else
+		{
+			QMessageBox::critical(this, tr("Load State Failed"), tr("Cannot load a save state without a running VM."));
+		}
+	}
+	else if (VMManager::IsLoadableFileName(filename_str))
+	{
+		// if we're already running, do a disc change, otherwise start
+		event->acceptProposedAction();
+		if (m_vm_valid)
+			doDiscChange(filename);
+		else
+			doStartDisc(filename);
+	}	
+}
+
 DisplayWidget* MainWindow::createDisplay(bool fullscreen, bool render_to_main)
 {
 	DevCon.WriteLn("createDisplay(%u, %u)", static_cast<u32>(fullscreen), static_cast<u32>(render_to_main));
@@ -2013,6 +2052,28 @@ void MainWindow::updateSaveStateMenus(const QString& filename, const QString& se
 		populateSaveStateMenu(m_ui.menuSaveState, serial, crc);
 }
 
+void MainWindow::doStartDisc(const QString& path)
+{
+	if (m_vm_valid)
+		return;
+
+	std::shared_ptr<VMBootParameters> params = std::make_shared<VMBootParameters>();
+	params->filename = path.toStdString();
+
+	// we might still be saving a resume state...
+	VMManager::WaitForSaveStateFlush();
+
+	const std::optional<bool> resume(
+		promptForResumeState(
+			QString::fromStdString(VMManager::GetSaveStateFileName(params->filename.c_str(), -1))));
+	if (!resume.has_value())
+		return;
+	else if (resume.value())
+		params->state_index = -1;
+
+	g_emu_thread->startVM(std::move(params));
+}
+
 void MainWindow::doDiscChange(const QString& path)
 {
 	bool reset_system = false;

pcsx2-qt/MainWindow.h

@@ -157,6 +157,8 @@ private Q_SLOTS:
 
 protected:
 	void closeEvent(QCloseEvent* event) override;
+	void dragEnterEvent(QDragEnterEvent* event) override;
+	void dropEvent(QDropEvent* event) override;
 
 private:
 	enum : s32
@@ -206,6 +208,7 @@ private:
 	void populateLoadStateMenu(QMenu* menu, const QString& filename, const QString& serial, quint32 crc);
 	void populateSaveStateMenu(QMenu* menu, const QString& serial, quint32 crc);
 	void updateSaveStateMenus(const QString& filename, const QString& serial, quint32 crc);
+	void doStartDisc(const QString& path);
 	void doDiscChange(const QString& path);
 
 	Ui::MainWindow m_ui;

pcsx2/Frontend/GameList.cpp

@@ -110,17 +110,13 @@ const char* GameList::EntryCompatibilityRatingToString(CompatibilityRating ratin
 	// clang-format on
 }
 
-bool GameList::IsScannableFilename(const std::string& path)
+bool GameList::IsScannableFilename(const std::string_view& path)
 {
 	static const char* extensions[] = {".iso", ".mdf", ".nrg", ".bin", ".img", ".gz", ".cso", ".chd", ".elf", ".irx"};
 
-	const std::string::size_type pos = path.rfind('.');
-	if (pos == std::string::npos)
-		return false;
-
 	for (const char* test_extension : extensions)
 	{
-		if (StringUtil::Strcasecmp(&path[pos], test_extension) == 0)
+		if (StringUtil::EndsWithNoCase(path, test_extension))
 			return true;
 	}
 

pcsx2/Frontend/GameList.h

@@ -72,7 +72,7 @@ namespace GameList
 	const char* RegionToString(Region region);
 	const char* EntryCompatibilityRatingToString(CompatibilityRating rating);
 
-	bool IsScannableFilename(const std::string& path);
+	bool IsScannableFilename(const std::string_view& path);
 
 	/// Fills in boot parameters (iso or elf) based on the game list entry.
 	void FillBootParametersForEntry(VMBootParameters* params, const Entry* entry);

pcsx2/VMManager.cpp

@@ -1208,18 +1208,28 @@ bool VMManager::ChangeDisc(std::string path)
 	return result;
 }
 
-bool VMManager::IsElfFileName(const std::string& path)
+bool VMManager::IsElfFileName(const std::string_view& path)
 {
 	return StringUtil::EndsWithNoCase(path, ".elf");
 }
 
-bool VMManager::IsGSDumpFileName(const std::string& path)
+bool VMManager::IsGSDumpFileName(const std::string_view& path)
 {
 	return (StringUtil::EndsWithNoCase(path, ".gs") ||
 			StringUtil::EndsWithNoCase(path, ".gs.xz") ||
 			StringUtil::EndsWithNoCase(path, ".gs.zst"));
 }
 
+bool VMManager::IsSaveStateFileName(const std::string_view& path)
+{
+	return StringUtil::EndsWithNoCase(path, ".p2s");
+}
+
+bool VMManager::IsLoadableFileName(const std::string_view& path)
+{
+	return IsElfFileName(path) || IsGSDumpFileName(path) || GameList::IsScannableFilename(path);
+}
+
 void VMManager::Execute()
 {
 	// Check for interpreter<->recompiler switches.

pcsx2/VMManager.h

@@ -135,10 +135,16 @@ namespace VMManager
 	bool ChangeDisc(std::string path);
 
 	/// Returns true if the specified path is an ELF.
-	bool IsElfFileName(const std::string& path);
+	bool IsElfFileName(const std::string_view& path);
 
 	/// Returns true if the specified path is a GS Dump.
-	bool IsGSDumpFileName(const std::string& path);
+	bool IsGSDumpFileName(const std::string_view& path);
+
+	/// Returns true if the specified path is a save state.
+	bool IsSaveStateFileName(const std::string_view& path);
+
+	/// Returns true if the specified path is a disc/elf/etc.
+	bool IsLoadableFileName(const std::string_view& path);
 
 	/// Returns the path for the game settings ini file for the specified CRC.
 	std::string GetGameSettingsPath(const std::string_view& game_serial, u32 game_crc);