Move keybinding settings to (Lua-based) setting menu (#15791)

src/gui/guiButtonKey.h

@@ -0,0 +1,75 @@
+// Luanti
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+#pragma once
+
+#include "guiButton.h"
+#include "client/keycode.h"
+#include "util/string.h"
+#include "gettext.h"
+
+using namespace irr;
+
+class GUIButtonKey : public GUIButton
+{
+	using super = GUIButton;
+
+public:
+	//! Constructor
+	GUIButtonKey(gui::IGUIEnvironment *environment, gui::IGUIElement *parent,
+			s32 id, core::rect<s32> rectangle, ISimpleTextureSource *tsrc,
+			bool noclip = false)
+		: GUIButton(environment, parent, id, rectangle, tsrc, noclip) {}
+
+	//! Sets the text for the key field
+	virtual void setText(const wchar_t *text) override
+	{
+		setKey(wide_to_utf8(text));
+	}
+
+	//! Gets the value for the key field
+	virtual const wchar_t *getText() const override
+	{
+		return keysym.c_str();
+	}
+
+	//! Do not drop returned handle
+	static GUIButtonKey *addButton(gui::IGUIEnvironment *environment,
+			const core::rect<s32> &rectangle, ISimpleTextureSource *tsrc,
+			IGUIElement *parent, s32 id, const wchar_t *text = L"",
+			const wchar_t *tooltiptext = L"");
+
+	//! Called if an event happened
+	virtual bool OnEvent(const SEvent &event) override;
+
+private:
+	void sendKey();
+
+	//! Start key capture
+	void startCapture()
+	{
+		if (nostart) {
+			nostart = false;
+			return;
+		}
+		capturing = true;
+		super::setText(wstrgettext("Press Button").c_str());
+	}
+
+	//! Cancel key capture
+	// inhibit_restart: whether the next call to startCapture should be inhibited
+	void cancelCapture(bool inhibit_restart = false)
+	{
+		capturing = false;
+		nostart |= inhibit_restart;
+		super::setText(wstrgettext(key_value.name()).c_str());
+	}
+
+	//! Sets the captured key and stop capturing
+	void setKey(KeyPress key);
+
+	bool capturing = false;
+	bool nostart = false;
+	KeyPress key_value = {};
+	std::wstring keysym;
+};