Mirroring 传输层 深度解析

24def find_window():
25    """{x, y, w, h, id} of the mirroring window in screen points, or None."""
26    wins = Quartz.CGWindowListCopyWindowInfo(
27        Quartz.kCGWindowListOptionOnScreenOnly, Quartz.kCGNullWindowID) or []
28    for w in wins:
29        if w.get("kCGWindowOwnerName") == APP_NAME and w.get("kCGWindowLayer", 1) == 0:
30            b = w["kCGWindowBounds"]
31            if b["Width"] < 100:  # ignore panels/toolbars
32                continue
33            return {"x": b["X"], "y": b["Y"], "w": b["Width"], "h": b["Height"],
34                    "id": int(w["kCGWindowNumber"])}
35    return None

91def capture(path=None, retries=2):
92    """Capture the mirroring window as a PNG. Returns (path, window_bounds).
93
94    `screencapture -l <id>` grabs only the window (no shadow, even if covered)
95    but fails with "could not create image from window" when the window is not
96    frontmost/composited. So we activate first, and fall back to a region
97    capture of the window rect, which succeeds regardless of window backing
98    (the app is frontmost by then, so nothing occludes the rect).
99    """
100    path = str(path or TMP / "window.png")
101    last = None
102    for attempt in range(retries + 1):
103        win = find_window() or ensure_window()
104        # -l: window-only, ideal when it works
105        ok, last = _run_capture(
106            ["screencapture", "-x", "-o", "-l", str(win["id"]), path], path)
107        if ok:
108            return path, win
109        # not backed — bring it frontmost and retry the region instead
110        activate()
111        win = find_window() or win
112        region = f"{int(win['x'])},{int(win['y'])},{int(win['w'])},{int(win['h'])}"
113        ok, last = _run_capture(
114            ["screencapture", "-x", "-R", region, path], path)
115        if ok:
116            return path, win
117        time.sleep(0.3)
118    raise RuntimeError(f"window capture failed after {retries + 1} tries: {last}")

123def _post_mouse(etype, x, y):
124    ev = Quartz.CGEventCreateMouseEvent(
125        None, etype, Quartz.CGPointMake(x, y), Quartz.kCGMouseButtonLeft)
126    Quartz.CGEventPost(Quartz.kCGHIDEventTap, ev)
127
128
129def _focus():
130    activate()
131
132
133def tap(x, y):
134    _focus()
135    _post_mouse(Quartz.kCGEventMouseMoved, x, y)
136    time.sleep(0.1)
137    _post_mouse(Quartz.kCGEventLeftMouseDown, x, y)
138    time.sleep(0.06)
139    _post_mouse(Quartz.kCGEventLeftMouseUp, x, y)
140
141
142def long_press(x, y, duration=0.8):
143    _focus()
144    _post_mouse(Quartz.kCGEventMouseMoved, x, y)
145    time.sleep(0.1)
146    _post_mouse(Quartz.kCGEventLeftMouseDown, x, y)
147    time.sleep(duration)
148    _post_mouse(Quartz.kCGEventLeftMouseUp, x, y)
149
150
151def drag(x1, y1, x2, y2, duration=0.35, steps=14):
152    """Touch-drag (what iOS sees as a swipe)."""
153    _focus()
154    _post_mouse(Quartz.kCGEventMouseMoved, x1, y1)
155    time.sleep(0.1)
156    _post_mouse(Quartz.kCGEventLeftMouseDown, x1, y1)
157    for i in range(1, steps + 1):
158        t = i / steps
159        _post_mouse(Quartz.kCGEventLeftMouseDragged,
160                    x1 + (x2 - x1) * t, y1 + (y2 - y1) * t)
161        time.sleep(duration / steps)
162    _post_mouse(Quartz.kCGEventLeftMouseUp, x2, y2)
163
164
165def scroll_wheel(dy, x, y, steps=6):
166    """Scroll-gesture at (x, y). Positive dy scrolls content up (finger down)."""
167    _focus()
168    _post_mouse(Quartz.kCGEventMouseMoved, x, y)
169    time.sleep(0.1)
170    for _ in range(steps):
171        ev = Quartz.CGEventCreateScrollWheelEvent(
172            None, Quartz.kCGScrollEventUnitPixel, 1, int(dy / steps))
173        Quartz.CGEventSetLocation(ev, Quartz.CGPointMake(x, y))
174        Quartz.CGEventPost(Quartz.kCGHIDEventTap, ev)
175        time.sleep(0.03)