diff --git a/capture/button.cpp b/capture/button.cpp
index 60c6b0b7..3894f2ac 100644
--- a/capture/button.cpp
+++ b/capture/button.cpp
@@ -28,7 +28,7 @@ namespace {
     const int BUTTON_SIZE = 30;
 }
 
-Button::Button(Type t, QWidget *parent) : QPushButton(parent),
+Button::Button(const Type t, QWidget *parent) : QPushButton(parent),
     m_buttonType(t) {
     initButton();
 
@@ -40,8 +40,8 @@ Button::Button(Type t, QWidget *parent) : QPushButton(parent),
     }
 }
 
-Button::Button(Button::Type t, bool isWhite, QWidget *parent) : QPushButton(parent),
-    m_buttonType(t) {
+Button::Button(const Button::Type t, const bool isWhite, QWidget *parent)
+    : QPushButton(parent), m_buttonType(t) {
     initButton();
 
     if (t == Button::Type::selectionIndicator) {
@@ -142,7 +142,7 @@ QString Button::getStyle() {
     return getStyle(mainColor);
 }
 
-QString Button::getStyle(QColor mainColor) {
+QString Button::getStyle(const QColor &mainColor) {
     QString baseSheet = "Button { border-radius: 15px;"
                         "background-color: %1; color: white }"
                         "Button:hover { background-color: %2; }"
@@ -199,7 +199,7 @@ size_t Button::getButtonBaseSize() {
 }
 // getTypeByName receives a name and return the corresponding button type.
 // returns Button::Type::last when the corresponding button is not found.
-Button::Type Button::getTypeByName(QString s) {
+Button::Type Button::getTypeByName(const QString s) {
     Button::Type res = Type::last;
     for (auto it = typeName.begin(); it != typeName.end(); ++it )
         if (it->second == s)
@@ -207,11 +207,11 @@ Button::Type Button::getTypeByName(QString s) {
     return res;
 }
 
-QString Button::getTypeName(Button::Type t) {
+QString Button::getTypeName(const Button::Type t) {
     return typeName[t];
 }
 
-QString Button::getTypeTooltip(Button::Type t) {
+QString Button::getTypeTooltip(const Button::Type t) {
     return typeTooltip[t];
 }
 
diff --git a/capture/button.h b/capture/button.h
index 717d5b69..72fd9468 100644
--- a/capture/button.h
+++ b/capture/button.h
@@ -49,17 +49,17 @@ public:
         colorPicker
     };
 
-    explicit Button(Type, QWidget *parent = 0);
-    explicit Button(Type, bool isWhite, QWidget *parent = 0);
+    explicit Button(const Type, QWidget *parent = 0);
+    explicit Button(const Type, const bool isWhite, QWidget *parent = 0);
 
     static QIcon getIcon(const Type);
     static QIcon getIcon(const Type, bool isWhite);
     static QString getStyle();
-    static QString getStyle(QColor);
+    static QString getStyle(const QColor &);
     static size_t getButtonBaseSize();
-    static Button::Type getTypeByName(QString);
-    static QString getTypeName(Button::Type);
-    static QString getTypeTooltip(Button::Type);
+    static Button::Type getTypeByName(const QString);
+    static QString getTypeName(const Button::Type);
+    static QString getTypeTooltip(const Button::Type);
 
     Type getButtonType() const;
 
diff --git a/capture/buttonhandler.cpp b/capture/buttonhandler.cpp
index 2a9258c1..03b882a4 100644
--- a/capture/buttonhandler.cpp
+++ b/capture/buttonhandler.cpp
@@ -296,7 +296,7 @@ QVector<QPoint> ButtonHandler::getVPoints(
     return res;
 }
 // setButtons redefines the buttons of the button handler
-void ButtonHandler::setButtons(QVector<Button *> v) {
+void ButtonHandler::setButtons(const QVector<Button *> v) {
     for (Button *b: m_vectorButtons) delete(b);
     m_vectorButtons = v;
     if (!v.isEmpty()) {
diff --git a/capture/buttonhandler.h b/capture/buttonhandler.h
index 79886d22..d24d5c81 100644
--- a/capture/buttonhandler.h
+++ b/capture/buttonhandler.h
@@ -37,7 +37,7 @@ public:
     size_t size() const;
 
     void updatePosition(const QRect &selection, const QRect &limits);
-    void setButtons(QVector<Button*>);
+    void setButtons(const QVector<Button*>);
 
 private:
     QVector<QPoint> getHPoints(const QPoint &center, const int elements) const;
diff --git a/capture/screenshot.cpp b/capture/screenshot.cpp
index 468f6bae..7e1529e3 100644
--- a/capture/screenshot.cpp
+++ b/capture/screenshot.cpp
@@ -39,7 +39,6 @@ Screenshot::Screenshot(const QPixmap &p) : m_baseScreenshot(p),
     m_modifiedScreenshot(p) {}
 
 Screenshot::~Screenshot() {
-    if (m_accessManager) delete(m_accessManager);
 }
 
 void Screenshot::setScreenshot(const QPixmap &p) {
diff --git a/config/uicoloreditor.cpp b/config/uicoloreditor.cpp
index d8f67fcf..f6fcc9c3 100644
--- a/config/uicoloreditor.cpp
+++ b/config/uicoloreditor.cpp
@@ -24,7 +24,7 @@ void UIcolorEditor::updateUIcolor() {
     settings.setValue("uiColor", m_uiColor);
 }
 
-void UIcolorEditor::updateLocalColor(QColor c) {
+void UIcolorEditor::updateLocalColor(const QColor c) {
     m_uiColor = c;
     QString style = Button::getStyle(c);
     m_button->setStyleSheet(style);
diff --git a/config/uicoloreditor.h b/config/uicoloreditor.h
index 66db87d5..fa72cdb3 100644
--- a/config/uicoloreditor.h
+++ b/config/uicoloreditor.h
@@ -14,7 +14,7 @@ public:
 
 private slots:
     void updateUIcolor();
-    void updateLocalColor(QColor);
+    void updateLocalColor(const QColor);
 
 private:
     QColor m_uiColor;