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/dialogs/EditHotkeyDialog.hpp

@@ -0,0 +1,59 @@
+#pragma once
+
+#include "controllers/hotkeys/Hotkey.hpp"
+
+#include <QDialog>
+
+#include <memory>
+
+namespace Ui {
+
+class EditHotkeyDialog;
+
+}  // namespace Ui
+
+namespace chatterino {
+
+class EditHotkeyDialog : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit EditHotkeyDialog(const std::shared_ptr<Hotkey> data,
+                              bool isAdd = false, QWidget *parent = nullptr);
+    ~EditHotkeyDialog() final;
+
+    std::shared_ptr<Hotkey> data();
+
+protected slots:
+    /**
+     * @brief validates the hotkey
+     *
+     * fired by the ok button
+     **/
+    void afterEdit();
+
+    /**
+     * @brief updates the list of actions based on the category
+     *
+     * fired by the category picker changing
+     **/
+    void updatePossibleActions();
+
+    /**
+     * @brief updates the arguments description and input visibility
+     *
+     * fired by the action picker changing
+     **/
+    void updateArgumentsInput();
+
+private:
+    void showEditError(QString errorText);
+
+    Ui::EditHotkeyDialog *ui_;
+    std::shared_ptr<Hotkey> data_;
+
+    bool shownSingleKeyWarning = false;
+};
+
+}  // namespace chatterino