When the mouse cursor goes outside the canvas element, press, release and position data is not coming.
貢獻者指南
技術棧
ccppwasm
領域
frontend
議題類型
bug
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
half day
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
fresh
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
mostly clear
前置要求
C++ basicsWebAssembly conceptsGLFW library basics
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
50
研究方向
First, examine the GLFW implementation in Emscripten's source code, likely in system/include/emscripten/glfw.h or similar, to understand how mouse events are currently handled. Then, investigate the browser's Pointer Events API and the use of setPointerCapture to capture mouse events outside the canvas. Check existing discussions or linked issues for any known solutions. Finally, propose adding pointer capture logic to the GLFW mouse event handling when the cursor leaves the canvas.
