macos: mouse button and mouse move events

include/ghostty.h

@@ -40,6 +40,17 @@ typedef struct {
     double scale_factor;
 } ghostty_surface_config_s;
 
+typedef enum {
+    GHOSTTY_MOUSE_RELEASE,
+    GHOSTTY_MOUSE_PRESS,
+} ghostty_input_mouse_state_e;
+
+typedef enum {
+    GHOSTTY_MOUSE_LEFT = 1,
+    GHOSTTY_MOUSE_RIGHT,
+    GHOSTTY_MOUSE_MIDDLE,
+} ghostty_input_mouse_button_e;
+
 typedef enum {
     GHOSTTY_MODS_NONE  = 0,
     GHOSTTY_MODS_SHIFT = 1 << 0,
@@ -218,6 +229,8 @@ void ghostty_surface_set_focus(ghostty_surface_t, bool);
 void ghostty_surface_set_size(ghostty_surface_t, uint32_t, uint32_t);
 void ghostty_surface_key(ghostty_surface_t, ghostty_input_action_e, ghostty_input_key_e, ghostty_input_mods_e);
 void ghostty_surface_char(ghostty_surface_t, uint32_t);
+void ghostty_surface_mouse_button(ghostty_surface_t, ghostty_input_mouse_state_e, ghostty_input_mouse_button_e, ghostty_input_mods_e);
+void ghostty_surface_mouse_pos(ghostty_surface_t, double, double);
 
 #ifdef __cplusplus
 }

macos/Sources/TerminalSurfaceView.swift

@@ -221,8 +221,10 @@ class TerminalSurfaceView_Real: NSView, NSTextInputClient, ObservableObject {
             self.error = AppError.surfaceCreateError
             return
         }
-        
         self.surface = surface;
+        
+        // Setup our tracking area so we get mouse moved events
+        updateTrackingAreas()
     }
     
     required init?(coder: NSCoder) {
@@ -230,6 +232,8 @@ class TerminalSurfaceView_Real: NSView, NSTextInputClient, ObservableObject {
     }
     
     deinit {
+        trackingAreas.forEach { removeTrackingArea($0) }
+        
         guard let surface = self.surface else { return }
         ghostty_surface_free(surface)
     }
@@ -249,6 +253,27 @@ class TerminalSurfaceView_Real: NSView, NSTextInputClient, ObservableObject {
         }
     }
     
+    override func updateTrackingAreas() {
+        // To update our tracking area we just recreate it all.
+        trackingAreas.forEach { removeTrackingArea($0) }
+        
+        // This tracking area is across the entire frame to notify us of mouse movements.
+        addTrackingArea(NSTrackingArea(
+            rect: frame,
+            options: [
+                .mouseEnteredAndExited,
+                .mouseMoved,
+                .inVisibleRect,
+                
+                // It is possible this is incorrect when we have splits. This will make
+                // mouse events only happen while the terminal is focused. Is that what
+                // we want?
+                .activeWhenFirstResponder,
+            ],
+            owner: self,
+            userInfo: nil))
+    }
+    
     override func viewDidChangeBackingProperties() {
         guard let surface = self.surface else { return }
 
@@ -268,7 +293,40 @@ class TerminalSurfaceView_Real: NSView, NSTextInputClient, ObservableObject {
     }
     
     override func mouseDown(with event: NSEvent) {
-        print("Mouse down: \(event)")
+        guard let surface = self.surface else { return }
+        let mods = Self.translateFlags(event.modifierFlags)
+        ghostty_surface_mouse_button(surface, GHOSTTY_MOUSE_PRESS, GHOSTTY_MOUSE_LEFT, mods)
+    }
+    
+    override func mouseUp(with event: NSEvent) {
+        guard let surface = self.surface else { return }
+        let mods = Self.translateFlags(event.modifierFlags)
+        ghostty_surface_mouse_button(surface, GHOSTTY_MOUSE_RELEASE, GHOSTTY_MOUSE_LEFT, mods)
+    }
+    
+    override func rightMouseDown(with event: NSEvent) {
+        guard let surface = self.surface else { return }
+        let mods = Self.translateFlags(event.modifierFlags)
+        ghostty_surface_mouse_button(surface, GHOSTTY_MOUSE_PRESS, GHOSTTY_MOUSE_RIGHT, mods)
+    }
+    
+    override func rightMouseUp(with event: NSEvent) {
+        guard let surface = self.surface else { return }
+        let mods = Self.translateFlags(event.modifierFlags)
+        ghostty_surface_mouse_button(surface, GHOSTTY_MOUSE_RELEASE, GHOSTTY_MOUSE_RIGHT, mods)
+    }
+    
+    override func mouseMoved(with event: NSEvent) {
+        guard let surface = self.surface else { return }
+
+        // Convert window position to view position. Note (0, 0) is bottom left.
+        let pos = self.convert(event.locationInWindow, from: nil)
+        ghostty_surface_mouse_pos(surface, pos.x, frame.height - pos.y)
+        
+    }
+    
+    override func mouseDragged(with event: NSEvent) {
+        self.mouseMoved(with: event)
     }
     
     override func keyDown(with event: NSEvent) {

src/App.zig

@@ -439,4 +439,23 @@ pub const CAPI = struct {
     export fn ghostty_surface_char(win: *Window, codepoint: u32) void {
         win.window.charCallback(codepoint);
     }
+
+    /// Tell the surface that it needs to schedule a render
+    export fn ghostty_surface_mouse_button(
+        win: *Window,
+        action: input.MouseButtonState,
+        button: input.MouseButton,
+        mods: c_int,
+    ) void {
+        win.window.mouseButtonCallback(
+            action,
+            button,
+            @bitCast(input.Mods, @truncate(u8, @bitCast(c_uint, mods))),
+        );
+    }
+
+    /// Update the mouse position within the view.
+    export fn ghostty_surface_mouse_pos(win: *Window, x: f64, y: f64) void {
+        win.window.cursorPosCallback(x, y);
+    }
 };

src/Window.zig

@@ -1292,7 +1292,7 @@ pub fn mouseButtonCallback(
     }
 
     // Always record our latest mouse state
-    self.mouse.click_state[@enumToInt(button)] = action;
+    self.mouse.click_state[@intCast(usize, @enumToInt(button))] = action;
     self.mouse.mods = @bitCast(input.Mods, mods);
 
     self.renderer_state.mutex.lock();

src/apprt/embedded.zig

@@ -58,6 +58,7 @@ pub const Window = struct {
     core_win: *CoreWindow,
     content_scale: apprt.ContentScale,
     size: apprt.WindowSize,
+    cursor_pos: apprt.CursorPos,
     opts: Options,
 
     pub const Options = extern struct {
@@ -82,6 +83,7 @@ pub const Window = struct {
                 .y = @floatCast(f32, opts.scale_factor),
             },
             .size = .{ .width = 800, .height = 600 },
+            .cursor_pos = .{ .x = 0, .y = 0 },
             .opts = opts,
         };
     }
@@ -130,6 +132,10 @@ pub const Window = struct {
         return false;
     }
 
+    pub fn getCursorPos(self: *const Window) !apprt.CursorPos {
+        return self.cursor_pos;
+    }
+
     pub fn refresh(self: *Window) void {
         self.core_win.refreshCallback() catch |err| {
             log.err("error in refresh callback err={}", .{err});
@@ -157,6 +163,37 @@ pub const Window = struct {
         };
     }
 
+    pub fn mouseButtonCallback(
+        self: *const Window,
+        action: input.MouseButtonState,
+        button: input.MouseButton,
+        mods: input.Mods,
+    ) void {
+        self.core_win.mouseButtonCallback(action, button, mods) catch |err| {
+            log.err("error in mouse button callback err={}", .{err});
+            return;
+        };
+    }
+
+    pub fn cursorPosCallback(self: *Window, x: f64, y: f64) void {
+        // Convert our unscaled x/y to scaled.
+        self.cursor_pos = self.core_win.window.cursorPosToPixels(.{
+            .x = @floatCast(f32, x),
+            .y = @floatCast(f32, y),
+        }) catch |err| {
+            log.err(
+                "error converting cursor pos to scaled pixels in cursor pos callback err={}",
+                .{err},
+            );
+            return;
+        };
+
+        self.core_win.cursorPosCallback(self.cursor_pos) catch |err| {
+            log.err("error in cursor pos callback err={}", .{err});
+            return;
+        };
+    }
+
     pub fn keyCallback(
         self: *const Window,
         action: input.Action,
@@ -184,4 +221,11 @@ pub const Window = struct {
             return;
         };
     }
+
+    /// The cursor position from the host directly is in screen coordinates but
+    /// all our interface works in pixels.
+    fn cursorPosToPixels(self: *const Window, pos: apprt.CursorPos) !apprt.CursorPos {
+        const scale = try self.getContentScale();
+        return .{ .x = pos.x * scale.x, .y = pos.y * scale.y };
+    }
 };

src/input/mouse.zig

@@ -1,7 +1,11 @@
 /// The state of a mouse button.
-pub const MouseButtonState = enum(u1) {
-    release = 0,
-    press = 1,
+///
+/// This is backed by a c_int so we can use this as-is for our embedding API.
+///
+/// IMPORTANT: Any changes here update include/ghostty.h
+pub const MouseButtonState = enum(c_int) {
+    release,
+    press,
 };
 
 /// Possible mouse buttons. We only track up to 11 because thats the maximum
@@ -10,7 +14,11 @@ pub const MouseButtonState = enum(u1) {
 ///
 /// Its a bit silly to name numbers like this but given its a restricted
 /// set, it feels better than passing around raw numeric literals.
-pub const MouseButton = enum(u4) {
+///
+/// This is backed by a c_int so we can use this as-is for our embedding API.
+///
+/// IMPORTANT: Any changes here update include/ghostty.h
+pub const MouseButton = enum(c_int) {
     const Self = @This();
 
     /// The maximum value in this enum. This can be used to create a densely