mirror of
https://bitbucket.org/chromiumembedded/cef
synced 2025-06-05 21:39:12 +02:00
89 lines
3.9 KiB
Diff
89 lines
3.9 KiB
Diff
diff --git base/message_loop/message_loop_current.h base/message_loop/message_loop_current.h
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index c5016dcf20a2..cf1db622f8fb 100644
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--- base/message_loop/message_loop_current.h
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+++ base/message_loop/message_loop_current.h
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@@ -120,6 +120,16 @@ class BASE_EXPORT MessageLoopCurrent {
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void AddTaskObserver(TaskObserver* task_observer);
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void RemoveTaskObserver(TaskObserver* task_observer);
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+#if defined(OS_WIN)
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+ void set_os_modal_loop(bool os_modal_loop) {
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+ os_modal_loop_ = os_modal_loop;
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+ }
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+
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+ bool os_modal_loop() const {
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+ return os_modal_loop_;
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+ }
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+#endif // OS_WIN
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+
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// Enables or disables the recursive task processing. This happens in the case
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// of recursive message loops. Some unwanted message loops may occur when
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// using common controls or printer functions. By default, recursive task
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@@ -188,6 +198,13 @@ class BASE_EXPORT MessageLoopCurrent {
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explicit MessageLoopCurrent(MessageLoop* current) : current_(current) {}
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MessageLoop* const current_;
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+
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+#if defined(OS_WIN)
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+ private:
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+ // Should be set to true before calling Windows APIs like TrackPopupMenu, etc.
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+ // which enter a modal message loop.
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+ bool os_modal_loop_ = false;
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+#endif
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};
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#if !defined(OS_NACL)
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diff --git base/message_loop/message_pump_win.cc base/message_loop/message_pump_win.cc
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index 8e6f1f41def2..b07865ebae37 100644
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--- base/message_loop/message_pump_win.cc
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+++ base/message_loop/message_pump_win.cc
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@@ -11,6 +11,7 @@
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#include "base/debug/alias.h"
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#include "base/memory/ptr_util.h"
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+#include "base/message_loop/message_loop_current.h"
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#include "base/metrics/histogram_macros.h"
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#include "base/strings/stringprintf.h"
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#include "base/trace_event/trace_event.h"
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@@ -369,20 +370,28 @@ bool MessagePumpForUI::ProcessMessageHelper(const MSG& msg) {
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}
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bool MessagePumpForUI::ProcessPumpReplacementMessage() {
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- // When we encounter a kMsgHaveWork message, this method is called to peek and
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- // process a replacement message. The goal is to make the kMsgHaveWork as non-
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- // intrusive as possible, even though a continuous stream of such messages are
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- // posted. This method carefully peeks a message while there is no chance for
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- // a kMsgHaveWork to be pending, then resets the |have_work_| flag (allowing a
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- // replacement kMsgHaveWork to possibly be posted), and finally dispatches
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- // that peeked replacement. Note that the re-post of kMsgHaveWork may be
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- // asynchronous to this thread!!
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-
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+ // When we encounter a kMsgHaveWork message, this method is called to peek
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+ // and process a replacement message, such as a WM_PAINT or WM_TIMER. The
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+ // goal is to make the kMsgHaveWork as non-intrusive as possible, even though
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+ // a continuous stream of such messages are posted. This method carefully
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+ // peeks a message while there is no chance for a kMsgHaveWork to be pending,
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+ // then resets the have_work_ flag (allowing a replacement kMsgHaveWork to
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+ // possibly be posted), and finally dispatches that peeked replacement. Note
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+ // that the re-post of kMsgHaveWork may be asynchronous to this thread!!
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+
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+ bool have_message = false;
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MSG msg;
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- const bool have_message =
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- PeekMessage(&msg, nullptr, 0, 0, PM_REMOVE) != FALSE;
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+ // We should not process all window messages if we are in the context of an
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+ // OS modal loop, i.e. in the context of a windows API call like MessageBox.
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+ // This is to ensure that these messages are peeked out by the OS modal loop.
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+ if (MessageLoopCurrent::Get()->os_modal_loop()) {
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+ // We only peek out WM_PAINT and WM_TIMER here for reasons mentioned above.
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+ have_message = PeekMessage(&msg, NULL, WM_PAINT, WM_PAINT, PM_REMOVE) ||
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+ PeekMessage(&msg, NULL, WM_TIMER, WM_TIMER, PM_REMOVE);
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+ } else {
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+ have_message = PeekMessage(&msg, NULL, 0, 0, PM_REMOVE) != FALSE;
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+ }
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- // Expect no message or a message different than kMsgHaveWork.
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DCHECK(!have_message || kMsgHaveWork != msg.message ||
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msg.hwnd != message_window_.hwnd());
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