GH-352 Make OneSix instance update downloads cancellable

api/logic/launch/steps/Update.cpp

@@ -18,7 +18,12 @@
 
 void Update::executeTask()
 {
-	m_updateTask = m_parent->instance()->createUpdateTask();
+	if(m_aborted)
+	{
+		emitFailed(tr("Task aborted."));
+		return;
+	}
+	m_updateTask.reset(m_parent->instance()->createUpdateTask());
 	if(m_updateTask)
 	{
 		connect(m_updateTask.get(), SIGNAL(finished()), this, SLOT(updateFinished()));
@@ -39,12 +44,37 @@ void Update::updateFinished()
 {
 	if(m_updateTask->successful())
 	{
+		m_updateTask.reset();
 		emitSucceeded();
 	}
 	else
 	{
 		QString reason = tr("Instance update failed because: %1.\n\n").arg(m_updateTask->failReason());
+		m_updateTask.reset();
 		emit logLine(reason, MessageLevel::Fatal);
 		emitFailed(reason);
 	}
 }
+
+bool Update::canAbort() const
+{
+	if(m_updateTask)
+	{
+		return m_updateTask->canAbort();
+	}
+	return true;
+}
+
+
+bool Update::abort()
+{
+	m_aborted = true;
+	if(m_updateTask)
+	{
+		if(m_updateTask->canAbort())
+		{
+			return m_updateTask->abort();
+		}
+	}
+	return true;
+}

api/logic/launch/steps/Update.h

@@ -16,6 +16,7 @@
 #pragma once
 
 #include <launch/LaunchStep.h>
+#include <QObjectPtr.h>
 #include <launch/LoggedProcess.h>
 #include <java/JavaChecker.h>
 
@@ -27,15 +28,16 @@ public:
 	explicit Update(LaunchTask *parent):LaunchStep(parent) {};
 	virtual ~Update() {};
 
-	virtual void executeTask();
-	virtual bool canAbort() const
-	{
-		return false;
-	}
-	virtual void proceed();
+	void executeTask() override;
+	bool canAbort() const override;
+	void proceed() override;
+public slots:
+	bool abort() override;
+
 private slots:
 	void updateFinished();
 
 private:
-	std::shared_ptr<Task> m_updateTask;
+	shared_qobject_ptr<Task> m_updateTask;
+	bool m_aborted = false;
 };