Tell irrlicht if we handle a key or not.

We can remove the function in MtNativeActivity now
as it serves precisely that purpose: to tell irrlicht
that we handled the esc key.

TODO for later:
 * Perhaps try to find a more performant container than KeyList

build/android/src/main/java/net.minetest.minetest/MtNativeActivity.java

@@ -19,11 +19,6 @@ public class MtNativeActivity extends NativeActivity {
 	public void onDestroy() {
 		super.onDestroy();
 	}
-	
-	@Override
-	public void onBackPressed() {
-	}
-
 
 	public void copyAssets() {
 		Intent intent = new Intent(this, MinetestAssetCopy.class);

src/client/inputhandler.h

@@ -42,11 +42,15 @@ class MyEventReceiver : public IEventReceiver
 
 		// Remember whether each key is down or up
 		if (event.EventType == irr::EET_KEY_INPUT_EVENT) {
-			if (event.KeyInput.PressedDown) {
-				keyIsDown.set(event.KeyInput);
-				keyWasDown.set(event.KeyInput);
-			} else {
-				keyIsDown.unset(event.KeyInput);
+			const KeyPress &keyCode = event.KeyInput;
+			if (keysListenedFor[keyCode]) {
+				if (event.KeyInput.PressedDown) {
+					keyIsDown.set(keyCode);
+					keyWasDown.set(keyCode);
+				} else {
+					keyIsDown.unset(keyCode);
+				}
+				return true;
 			}
 		}
 
@@ -116,6 +120,15 @@ class MyEventReceiver : public IEventReceiver
 		return b;
 	}
 
+	void listenForKey(const KeyPress &keyCode)
+	{
+		keysListenedFor.set(keyCode);
+	}
+	void dontListenForKeys()
+	{
+		keysListenedFor.clear();
+	}
+
 	s32 getMouseWheel()
 	{
 		s32 a = mouse_wheel;
@@ -168,6 +181,12 @@ class MyEventReceiver : public IEventReceiver
 	KeyList keyIsDown;
 	// Whether a key has been pressed or not
 	KeyList keyWasDown;
+	// List of keys we listen for
+	// TODO perhaps the type of this is not really
+	// performant as KeyList is designed for few but
+	// often changing keys, and keysListenedFor is expected
+	// to change seldomly but contain lots of keys.
+	KeyList keysListenedFor;
 };
 
 
@@ -192,6 +211,14 @@ class RealInputHandler : public InputHandler
 	{
 		return m_receiver->WasKeyDown(keyCode);
 	}
+	virtual void listenForKey(const KeyPress &keyCode)
+	{
+		m_receiver->listenForKey(keyCode);
+	}
+	virtual void dontListenForKeys()
+	{
+		m_receiver->dontListenForKeys();
+	}
 	virtual v2s32 getMousePos()
 	{
 		if (m_device->getCursorControl()) {

src/game.cpp

@@ -1297,7 +1297,11 @@ static void updateChat(Client &client, f32 dtime, bool show_debug,
  */
 struct KeyCache {
 
-	KeyCache() { populate(); }
+	KeyCache()
+	{
+		handler = NULL;
+		populate();
+	}
 
 	enum {
 		// Player movement
@@ -1349,6 +1353,7 @@ struct KeyCache {
 	void populate();
 
 	KeyPress key[KEYMAP_INTERNAL_ENUM_COUNT];
+	InputHandler *handler;
 };
 
 void KeyCache::populate()
@@ -1399,6 +1404,19 @@ void KeyCache::populate()
 	key[KEYMAP_ID_QUICKTUNE_DEC]  = getKeySetting("keymap_quicktune_dec");
 
 	key[KEYMAP_ID_DEBUG_STACKS]   = getKeySetting("keymap_print_debug_stacks");
+
+	if (handler) {
+		// First clear all keys, then re-add the ones we listen for
+		handler->dontListenForKeys();
+		for (size_t i = 0; i < KEYMAP_INTERNAL_ENUM_COUNT; i++) {
+			handler->listenForKey(key[i]);
+		}
+		handler->listenForKey(EscapeKey);
+		handler->listenForKey(CancelKey);
+		for (size_t i = 0; i < 10; i++) {
+			handler->listenForKey(NumberKey[i]);
+		}
+	}
 }
 
 
@@ -1829,6 +1847,9 @@ bool Game::startup(bool *kill,
 	this->chat_backend        = chat_backend;
 	this->simple_singleplayer_mode = simple_singleplayer_mode;
 
+	keycache.handler = input;
+	keycache.populate();
+
 	driver              = device->getVideoDriver();
 	smgr                = device->getSceneManager();
 

src/game.h

@@ -110,6 +110,9 @@ class InputHandler
 	virtual bool isKeyDown(const KeyPress &keyCode) = 0;
 	virtual bool wasKeyDown(const KeyPress &keyCode) = 0;
 
+	virtual void listenForKey(const KeyPress &keyCode) {}
+	virtual void dontListenForKeys() {}
+
 	virtual v2s32 getMousePos() = 0;
 	virtual void setMousePos(s32 x, s32 y) = 0;