Add clear memory button.

src/app/GUI/usagewidget.cpp

@@ -20,6 +20,7 @@
 #include "Private/Tasks/taskscheduler.h"
 #include "Private/Tasks/complextask.h"
 #include "conncontextptr.h"
+#include "memoryhandler.h"
 
 #include <QTimer>
 #include <QLocale>
@@ -146,6 +147,13 @@ UsageWidget::UsageWidget(QWidget * const parent) : QStatusBar(parent) {
 
     mRamLabel = new QLabel(this);
 
+    const auto clearRamButton = new QPushButton("clear memory", this);
+    connect(clearRamButton, &QPushButton::clicked,
+            this, []() {
+        const auto m = MemoryHandler::sInstance;
+        m->clearMemory();
+    });
+
     addPermanentWidget(gpuLabel);
     addPermanentWidget(mGpuBar);
 
@@ -160,6 +168,8 @@ UsageWidget::UsageWidget(QWidget * const parent) : QStatusBar(parent) {
 
     addPermanentWidget(mRamLabel);
 
+    addPermanentWidget(clearRamButton);
+
     setThreadsTotal(QThread::idealThreadCount());
 
     connect(TaskScheduler::instance(), &TaskScheduler::hddUsageChanged,
@@ -200,7 +210,7 @@ void UsageWidget::setTotalRam(const qreal totalRamMB) {
 }
 
 void UsageWidget::addComplexTask(ComplexTask * const task) {
-    for(const auto wid : mTaskWidgets) {
+    for(const auto wid : qAsConst(mTaskWidgets)) {
         if(wid->isHidden()) {
             return wid->setComplexTask(task);
         }

src/app/memoryhandler.cpp

@@ -60,6 +60,10 @@ MemoryHandler::~MemoryHandler() {
     delete mMemoryChecker;
 }
 
+void MemoryHandler::clearMemory() {
+    freeMemory(NORMAL_MEMORY_STATE, longB(std::numeric_limits<qint64>::max()));
+}
+
 MemoryState MemoryHandler::sMemoryState() {
     return sInstance->mMemoryState;
 }

src/app/memoryhandler.h

@@ -26,6 +26,8 @@ class MemoryHandler : public QObject {
     explicit MemoryHandler(QObject * const parent = nullptr);
     ~MemoryHandler();
 
+    void clearMemory();
+
     static MemoryHandler *sInstance;
     static MemoryState sMemoryState();
 signals: