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fix_non-client_mouse_tracking_and_message_bubbling_on_windows.patch
61 lines (57 loc) · 3.24 KB
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fix_non-client_mouse_tracking_and_message_bubbling_on_windows.patch
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: clavin <cwatford@slack-corp.com>
Date: Fri, 11 Feb 2022 15:05:42 -0700
Subject: fix: non-client mouse tracking and message bubbling on windows
It is not known why, but for some reason calling |DefWindowProc| on the parent
window handle causes a WM_NCMOUSELEAVE (non-client mouse exit) message to be
sent to the parent window, even though |TrackMouseEvent| is never called on it.
This patch also adds some boilerplate for properly tracking non-client mouse
messages in the legacy window handle layer.
These conditions are regularly hit with WCO-enabled windows on Windows.
diff --git a/content/browser/renderer_host/legacy_render_widget_host_win.cc b/content/browser/renderer_host/legacy_render_widget_host_win.cc
index 8b196e1a10c96443a912eaaeb9327982618efa41..73105fbc3ce41cec821aa1b25006fcf202a4ae77 100644
--- a/content/browser/renderer_host/legacy_render_widget_host_win.cc
+++ b/content/browser/renderer_host/legacy_render_widget_host_win.cc
@@ -288,12 +288,12 @@ LRESULT LegacyRenderWidgetHostHWND::OnMouseRange(UINT message,
WPARAM w_param,
LPARAM l_param,
BOOL& handled) {
- if (message == WM_MOUSEMOVE) {
+ if (message == WM_MOUSEMOVE || message == WM_NCMOUSEMOVE) {
if (!mouse_tracking_enabled_) {
mouse_tracking_enabled_ = true;
TRACKMOUSEEVENT tme;
tme.cbSize = sizeof(tme);
- tme.dwFlags = TME_LEAVE;
+ tme.dwFlags = message == WM_NCMOUSEMOVE ? TME_NONCLIENT | TME_LEAVE : TME_LEAVE;
tme.hwndTrack = hwnd();
tme.dwHoverTime = 0;
TrackMouseEvent(&tme);
@@ -319,12 +319,11 @@ LRESULT LegacyRenderWidgetHostHWND::OnMouseRange(UINT message,
message, w_param, l_param, &msg_handled);
handled = msg_handled;
// If the parent did not handle non client mouse messages, we call
- // DefWindowProc on the message with the parent window handle. This
- // ensures that WM_SYSCOMMAND is generated for the parent and we are
- // out of the picture.
+ // DefWindowProc on the message. This ensures that WM_SYSCOMMAND is
+ // generated.
if (!handled &&
(message >= WM_NCMOUSEMOVE && message <= WM_NCXBUTTONDBLCLK)) {
- ret = ::DefWindowProc(GetParent(), message, w_param, l_param);
+ ret = ::DefWindowProc(hwnd(), message, w_param, l_param);
handled = TRUE;
}
}
diff --git a/content/browser/renderer_host/legacy_render_widget_host_win.h b/content/browser/renderer_host/legacy_render_widget_host_win.h
index 026e8b93602766e8d8e4a04f467b68ce3cea92de..83ca674adb6c6bf5e16d38b12aa33dddbf685bd8 100644
--- a/content/browser/renderer_host/legacy_render_widget_host_win.h
+++ b/content/browser/renderer_host/legacy_render_widget_host_win.h
@@ -100,6 +100,7 @@ class CONTENT_EXPORT LegacyRenderWidgetHostHWND
MESSAGE_HANDLER_EX(WM_NCHITTEST, OnNCHitTest)
MESSAGE_RANGE_HANDLER(WM_NCMOUSEMOVE, WM_NCXBUTTONDBLCLK,
OnMouseRange)
+ MESSAGE_HANDLER_EX(WM_NCMOUSELEAVE, OnMouseLeave)
MESSAGE_HANDLER_EX(WM_NCCALCSIZE, OnNCCalcSize)
MESSAGE_HANDLER_EX(WM_SIZE, OnSize)
MESSAGE_HANDLER_EX(WM_DESTROY, OnDestroy)