From 73e6a8bd99c5cdf2b9ca28919f96b22250dbc3eb Mon Sep 17 00:00:00 2001
From: mleku <me@mleku.dev>
Date: Sun, 26 Oct 2025 20:17:39 +0000
Subject: [PATCH] Enhance rendering functionality by adding cursor visibility
 check. Updated Render method to conditionally draw the crosshair based on
 cursor presence in the window. Modified Run method to include cursorInWindow
 state management.

---
 cmd/hello/main.go    |  8 +++++---
 pkg/window/window.go | 23 +++++++++++++----------
 2 files changed, 18 insertions(+), 13 deletions(-)

diff --git a/cmd/hello/main.go b/cmd/hello/main.go
index e627286..8318278 100644
--- a/cmd/hello/main.go
+++ b/cmd/hello/main.go
@@ -95,7 +95,7 @@ func (app *WidgetApp) Init() (err error) {
 }
 
 // Render renders the widget tree
-func (app *WidgetApp) Render(width, height int, mouseX, mouseY float64) (err error) {
+func (app *WidgetApp) Render(width, height int, mouseX, mouseY float64, cursorInWindow bool) (err error) {
 	// Set the clear color to black
 	gl.ClearColor(0.0, 0.0, 0.0, 1.0)
 	gl.Clear(gl.COLOR_BUFFER_BIT)
@@ -130,8 +130,10 @@ func (app *WidgetApp) Render(width, height int, mouseX, mouseY float64) (err err
 		return
 	}
 
-	// Draw crosshair at mouse cursor position
-	drawCrosshair(float32(mouseX), float32(height)-float32(mouseY), width, height)
+	// Draw crosshair at mouse cursor position only if cursor is in window
+	if cursorInWindow {
+		drawCrosshair(float32(mouseX), float32(height)-float32(mouseY), width, height)
+	}
 
 	return
 }
diff --git a/pkg/window/window.go b/pkg/window/window.go
index 894e1b2..c755743 100644
--- a/pkg/window/window.go
+++ b/pkg/window/window.go
@@ -23,6 +23,7 @@ type Window struct {
 	resizeThreshold  int
 	mouseX           float64
 	mouseY           float64
+	cursorInWindow   bool
 }
 
 func init() {
@@ -44,7 +45,7 @@ func New(width, height int, title string) (w *Window, err error) {
 }
 
 // Run starts the window and runs the application main loop
-func (w *Window) Run(renderFunc func(windowWidth, windowHeight int, mouseX, mouseY float64) error) (err error) {
+func (w *Window) Run(renderFunc func(windowWidth, windowHeight int, mouseX, mouseY float64, cursorInWindow bool) error) (err error) {
 	if err = glfw.Init(); chk.E(err) {
 		return
 	}
@@ -103,6 +104,16 @@ func (w *Window) Run(renderFunc func(windowWidth, windowHeight int, mouseX, mous
 		log.D.Ln("Character input:", string(char))
 	})
 
+	// Set cursor enter/leave callback
+	w.window.SetCursorEnterCallback(func(window *glfw.Window, entered bool) {
+		w.cursorInWindow = entered
+		if entered {
+			log.D.Ln("Cursor entered window")
+		} else {
+			log.D.Ln("Cursor left window")
+		}
+	})
+
 	w.running = true
 	for !w.window.ShouldClose() && w.running {
 		// Get window size (logical size in screen coordinates)
@@ -122,7 +133,7 @@ func (w *Window) Run(renderFunc func(windowWidth, windowHeight int, mouseX, mous
 		}
 
 		// Render with window dimensions and mouse position
-		if err = renderFunc(windowWidth, windowHeight, w.mouseX, w.mouseY); chk.E(err) {
+		if err = renderFunc(windowWidth, windowHeight, w.mouseX, w.mouseY, w.cursorInWindow); chk.E(err) {
 			return
 		}
 
@@ -144,11 +155,3 @@ func (w *Window) Stop() {
 func (w *Window) GetWindow() *glfw.Window {
 	return w.window
 }
-
-// abs returns the absolute value of an integer
-func abs(x int) int {
-	if x < 0 {
-		return -x
-	}
-	return x
-}