Add custom hotkeys. (#2340)

Co-authored-by: LosFarmosCTL <80157503+LosFarmosCTL@users.noreply.github.com>
Co-authored-by: Paweł <zneix@zneix.eu>
Co-authored-by: Felanbird <41973452+Felanbird@users.noreply.github.com>
Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/widgets/BaseWidget.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <QShortcut>
 #include <QWidget>
 #include <boost/optional.hpp>
 #include <pajlada/signals/signal.hpp>
@@ -40,11 +41,19 @@ protected:
 
     virtual void scaleChangedEvent(float newScale);
     virtual void themeChangedEvent();
+    [[deprecated("addShortcuts called without overriding it")]] virtual void
+        addShortcuts()
+    {
+    }
 
     void setScale(float value);
 
     Theme *theme;
 
+    std::vector<QShortcut *> shortcuts_;
+    void clearShortcuts();
+    pajlada::Signals::SignalHolder signalHolder_;
+
 private:
     float scale_{1.f};
     boost::optional<float> overrideScale_;
@@ -52,8 +61,6 @@ private:
 
     std::vector<BaseWidget *> widgets_;
 
-    pajlada::Signals::SignalHolder signalHolder_;
-
     friend class BaseWindow;
 };