Webclient: WIP on properly supporting touchscreen input

When touch mode is off and a touchstart event is received, switch to touch mode. When touch mode is on and a mousedown event is received, disable touch mode. Unfortunately this still has a problem where touch mode will always get disabled if you touch while the keyboard is open. (because the game does NOT prevent the default behaviour of touchstart becoming a mousedown event when the keyboard is open, so that you can still click on the caret in text input box)

src/Event.c

@@ -97,6 +97,7 @@ void Event_UnregisterAll(void) {
 	InputEvents.Up.Count    = 0;
 	InputEvents.Wheel.Count = 0;
 	InputEvents.TextChanged.Count = 0;
+	InputEvents.ModeChanged.Count = 0;
 
 	PointerEvents.Moved.Count = 0;
 	PointerEvents.Down.Count  = 0;

src/Event.h

@@ -164,6 +164,7 @@ CC_VAR extern struct _InputEventsList {
 	struct Event_Int    Up;    /* Key or button is released. Arg is a member of Key enumeration */
 	struct Event_Float  Wheel; /* Mouse wheel is moved/scrolled (Arg is wheel delta) */
 	struct Event_String TextChanged; /* Text in the on-screen input keyboard changed (for Mobile) */
+	struct Event_Void   ModeChanged; /* Input_TouchMode has changed */
 } InputEvents;
 
 CC_VAR extern struct _PointerEventsList {

src/Gui.c

@@ -71,12 +71,22 @@ int Gui_ContainsPointers(int x, int y, int width, int height) {
 	return false;
 }
 
+#ifdef CC_BUILD_TOUCH
+static void UpdateTouchMenu(void) {
+	if (Input_TouchMode) {
+		TouchScreen_Show();
+	} else {
+		TouchScreen_Remove();
+	}
+}
+#else
+static void UpdateTouchMenu(void) { }
+#endif
+
 void Gui_ShowDefault(void) {
 	HUDScreen_Show();
 	ChatScreen_Show();
-#ifdef CC_BUILD_TOUCH
-	TouchScreen_Show();
-#endif
+	UpdateTouchMenu();
 }
 
 static void LoadOptions(void) {
@@ -536,6 +546,7 @@ static void OnTextChanged(void* obj, const cc_string* str) {
 		if (s->VTABLE->HandlesTextChanged(s, str)) return;
 	}
 }
+static void OnModeChanged(void* obj) { UpdateTouchMenu(); }
 #endif
 
 static void OnContextLost(void* obj) {
@@ -559,6 +570,7 @@ static void OnInit(void) {
 
 #ifdef CC_BUILD_TOUCH
 	Event_Register_(&InputEvents.TextChanged,    NULL, OnTextChanged);
+	Event_Register_(&InputEvents.ModeChanged,    NULL, OnModeChanged);
 	Gui._onscreenButtons = Options_GetInt(OPT_TOUCH_BUTTONS, 0, Int32_MaxValue, 0);
 #endif
 

src/Input.c

@@ -78,10 +78,13 @@ void Input_SetTouchMode(cc_bool enabled) {
 	ClearTouches();
 	Input_TouchMode = enabled;
 	Pointers_Count  = enabled ? 0 : 1;
+	Event_RaiseVoid(&InputEvents.ModeChanged);
 }
 
 void Input_AddTouch(long id, int x, int y) {
 	int i;
+	if (!Input_TouchMode) Input_SetTouchMode(true);
+
 	for (i = 0; i < INPUT_MAX_POINTERS; i++) {
 		if (touches[i].type) continue;
 
@@ -232,6 +235,11 @@ void Input_SetPressed(int key) {
 
 	/* don't allow multiple left mouse down events */
 	if (key != KEY_LMOUSE || wasPressed) return;
+
+#ifdef CC_BUILD_TOUCH
+	/* If touch mode, disable it since using mouse now */
+	if (Input_TouchMode) Input_SetTouchMode(false);
+#endif
 	Pointer_SetPressed(0, true);
 }
 

src/Screens.c

@@ -2186,8 +2186,8 @@ static const struct ScreenVTABLE TouchScreen_VTABLE = {
 void TouchScreen_Show(void) {
 	struct TouchScreen* s = &TouchScreen;
 	s->VTABLE = &TouchScreen_VTABLE;
-
-	if (!Input_TouchMode) return;
 	Gui_Add((struct Screen*)s, GUI_PRIORITY_TOUCH);
 }
+
+void TouchScreen_Remove(void) { Gui_Remove((struct Screen*)&TouchScreen); }
 #endif

src/Screens.h

@@ -32,6 +32,7 @@ void DisconnectScreen_Show(const cc_string* title, const cc_string* message);
 #ifdef CC_BUILD_TOUCH
 void TouchScreen_Refresh(void);
 void TouchScreen_Show(void);
+void TouchScreen_Remove(void);
 #endif
 
 /* Opens chat input for the HUD with the given initial text. */