Use OS-provided click counts on macOS and iOS for mouse press and release events.

src/events/SDL_mouse.c

@@ -322,15 +322,13 @@ static SDL_MouseClickState *GetMouseClickState(SDL_Mouse *mouse, Uint8 button)
     return &mouse->clickstate[button];
 }
 
-int
+static int
-SDL_SendMouseButton(SDL_Window * window, SDL_MouseID mouseID, Uint8 state, Uint8 button)
+SDL_PrivateSendMouseButton(SDL_Window * window, SDL_MouseID mouseID, Uint8 state, Uint8 button, int clicks)
 {
     SDL_Mouse *mouse = SDL_GetMouse();
     int posted;
     Uint32 type;
     Uint32 buttonstate = mouse->buttonstate;
-    SDL_MouseClickState *clickstate = GetMouseClickState(mouse, button);
-    Uint8 click_count;
 
     /* Figure out which event to perform */
     switch (state) {
@@ -358,7 +356,8 @@ SDL_SendMouseButton(SDL_Window * window, SDL_MouseID mouseID, Uint8 state, Uint8
     }
     mouse->buttonstate = buttonstate;
 
-    if (clickstate) {
+    if (clicks < 0) {
+        SDL_MouseClickState *clickstate = GetMouseClickState(mouse, button);
         if (state == SDL_PRESSED) {
             Uint32 now = SDL_GetTicks();
 
@@ -374,9 +373,7 @@ SDL_SendMouseButton(SDL_Window * window, SDL_MouseID mouseID, Uint8 state, Uint8
                 ++clickstate->click_count;
             }
         }
-        click_count = clickstate->click_count;
+        clicks = clickstate->click_count;
-    } else {
-        click_count = 1;
     }
 
     /* Post the event, if desired */
@@ -388,7 +385,7 @@ SDL_SendMouseButton(SDL_Window * window, SDL_MouseID mouseID, Uint8 state, Uint8
         event.button.which = mouseID;
         event.button.state = state;
         event.button.button = button;
-        event.button.clicks = click_count;
+        event.button.clicks = (Uint8) SDL_min(clicks, 255);
         event.button.x = mouse->x;
         event.button.y = mouse->y;
         posted = (SDL_PushEvent(&event) > 0);
@@ -402,6 +399,19 @@ SDL_SendMouseButton(SDL_Window * window, SDL_MouseID mouseID, Uint8 state, Uint8
     return posted;
 }
 
+int
+SDL_SendMouseButtonClicks(SDL_Window * window, SDL_MouseID mouseID, Uint8 state, Uint8 button, int clicks)
+{
+    clicks = SDL_max(clicks, 0);
+    return SDL_PrivateSendMouseButton(window, mouseID, state, button, clicks);
+}
+
+int
+SDL_SendMouseButton(SDL_Window * window, SDL_MouseID mouseID, Uint8 state, Uint8 button)
+{
+    return SDL_PrivateSendMouseButton(window, mouseID, state, button, -1);
+}
+
 int
 SDL_SendMouseWheel(SDL_Window * window, SDL_MouseID mouseID, int x, int y, SDL_MouseWheelDirection direction)
 {

src/events/SDL_mouse_c.h

@@ -119,6 +119,9 @@ extern int SDL_SendMouseMotion(SDL_Window * window, SDL_MouseID mouseID, int rel
 /* Send a mouse button event */
 extern int SDL_SendMouseButton(SDL_Window * window, SDL_MouseID mouseID, Uint8 state, Uint8 button);
 
+/* Send a mouse button event with a click count */
+extern int SDL_SendMouseButtonClicks(SDL_Window * window, SDL_MouseID mouseID, Uint8 state, Uint8 button, int clicks);
+
 /* Send a mouse wheel event */
 extern int SDL_SendMouseWheel(SDL_Window * window, SDL_MouseID mouseID, int x, int y, SDL_MouseWheelDirection direction);
 

src/video/cocoa/SDL_cocoawindow.m

@@ -823,6 +823,7 @@ SetWindowStyle(SDL_Window * window, NSUInteger style)
 - (void)mouseDown:(NSEvent *)theEvent
 {
     int button;
+    int clicks;
 
     /* Ignore events that aren't inside the client area (i.e. title bar.) */
     if ([theEvent window]) {
@@ -858,7 +859,9 @@ SetWindowStyle(SDL_Window * window, NSUInteger style)
         button = (int) [theEvent buttonNumber] + 1;
         break;
     }
-    SDL_SendMouseButton(_data->window, 0, SDL_PRESSED, button);
+
+    clicks = (int) [theEvent clickCount];
+    SDL_SendMouseButtonClicks(_data->window, 0, SDL_PRESSED, button, clicks);
 }
 
 - (void)rightMouseDown:(NSEvent *)theEvent
@@ -874,6 +877,7 @@ SetWindowStyle(SDL_Window * window, NSUInteger style)
 - (void)mouseUp:(NSEvent *)theEvent
 {
     int button;
+    int clicks;
 
     if ([self processHitTest:theEvent]) {
         SDL_SendWindowEvent(_data->window, SDL_WINDOWEVENT_HIT_TEST, 0, 0);
@@ -899,7 +903,9 @@ SetWindowStyle(SDL_Window * window, NSUInteger style)
         button = (int) [theEvent buttonNumber] + 1;
         break;
     }
-    SDL_SendMouseButton(_data->window, 0, SDL_RELEASED, button);
+
+    clicks = (int) [theEvent clickCount];
+    SDL_SendMouseButtonClicks(_data->window, 0, SDL_RELEASED, button, clicks);
 }
 
 - (void)rightMouseUp:(NSEvent *)theEvent

src/video/uikit/SDL_uikitview.m

@@ -143,12 +143,13 @@
 
         if (!firstFingerDown) {
             CGPoint locationInView = [self touchLocation:touch shouldNormalize:NO];
+            int clicks = (int) touch.tapCount;
 
             /* send mouse moved event */
             SDL_SendMouseMotion(sdlwindow, SDL_TOUCH_MOUSEID, 0, locationInView.x, locationInView.y);
 
             /* send mouse down event */
-            SDL_SendMouseButton(sdlwindow, SDL_TOUCH_MOUSEID, SDL_PRESSED, SDL_BUTTON_LEFT);
+            SDL_SendMouseButtonClicks(sdlwindow, SDL_TOUCH_MOUSEID, SDL_PRESSED, SDL_BUTTON_LEFT, clicks);
 
             firstFingerDown = touch;
         }
@@ -166,7 +167,8 @@
 
         if (touch == firstFingerDown) {
             /* send mouse up */
-            SDL_SendMouseButton(sdlwindow, SDL_TOUCH_MOUSEID, SDL_RELEASED, SDL_BUTTON_LEFT);
+            int clicks = (int) touch.tapCount;
+            SDL_SendMouseButtonClicks(sdlwindow, SDL_TOUCH_MOUSEID, SDL_RELEASED, SDL_BUTTON_LEFT, clicks);
             firstFingerDown = nil;
         }