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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/glic/widget/browser_conditions.h"
#include "base/memory/raw_ptr.h"
#include "base/scoped_multi_source_observation.h"
#include "base/scoped_observation.h"
#include "base/timer/timer.h"
#include "chrome/browser/glic/glic_enabling.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_list.h"
#include "chrome/browser/ui/browser_list_observer.h"
#include "chrome/browser/ui/views/frame/browser_view.h"
#include "ui/views/widget/widget_observer.h"
#if BUILDFLAG(IS_WIN)
#include "ui/aura/window.h"
#include "ui/aura/window_tree_host.h"
#include "ui/gfx/win/hwnd_util.h"
#endif // BUILDFLAG(IS_WIN)
namespace glic {
namespace {
#if BUILDFLAG(IS_WIN)
struct IsBrowserTopmostWindowState {
HWND browser_hwnd = nullptr;
bool browser_is_topmost_window = false;
};
// Window enumerator used to determine if the top most visible window, other
// than the system tray, is the browser window it is looking for. This is called
// in z-order, i.e., topmost window first.
// Window enumerator, so returning FALSE stops enumerating.
// `lParam` is a pointer to IsBrowserTopmostWindowState, which contains the
// browser HWND it is looking for. When finished enumerating, it sets
// topmost_visible_non_opaque_hwnd to the topmost non system tray HWND it
// finds.
BOOL CALLBACK IsBrowserWindowTopmostWindowEnumerator(HWND hwnd, LPARAM lParam) {
struct IsBrowserTopmostWindowState* state =
reinterpret_cast<struct IsBrowserTopmostWindowState*>(lParam);
if (hwnd == state->browser_hwnd) {
state->browser_is_topmost_window = true;
return FALSE;
} else if (gfx::GetClassName(hwnd) != L"Shell_TrayWnd" &&
gfx::IsWindowVisibleAndFullyOpaque(hwnd, nullptr)) {
state->browser_is_topmost_window = false;
return FALSE;
}
return TRUE;
}
bool IsBrowserWindowTopmostWindow(Browser* browser) {
HWND browser_hwnd =
browser->window()->GetNativeWindow()->GetHost()->GetAcceleratedWidget();
struct IsBrowserTopmostWindowState state{browser_hwnd, false};
EnumWindows(&IsBrowserWindowTopmostWindowEnumerator,
reinterpret_cast<LPARAM>(&state));
return state.browser_is_topmost_window;
}
#endif // BUILDFLAG(IS_WIN)
bool IsBrowserGlicCompatible(Profile* profile, Browser* browser) {
// A browser is not compatible if it:
// - is not a TYPE_NORMAL browser
// - is from a glic-disabled profile
// - uses a different Profile from glic
// WARNING: updating these conditions will require updating
// BrowserAttachObservation.
return GlicEnabling::IsEnabledForProfile(browser->profile()) &&
browser->is_type_normal() && browser->profile() == profile;
}
} // namespace
bool IsBrowserGlicAttachable(Profile* profile, Browser* browser) {
return IsBrowserGlicCompatible(profile, browser) &&
browser->window()->IsVisible() && !browser->window()->IsMinimized();
}
Browser* FindBrowserForAttachment(Profile* profile) {
// TODO (crbug.com/390472495) Determine which browser to attach to. Currently
// attaches to the last focused glic-compatible browser.
for (Browser* browser : BrowserList::GetInstance()->OrderedByActivation()) {
if (IsBrowserGlicAttachable(profile, browser)) {
return browser;
}
}
return nullptr;
}
bool IsBrowserInForeground(Browser* browser) {
if (browser->IsActive()) {
return true;
}
#if BUILDFLAG(IS_WIN)
// On Windows, clicking the status bar icon makes an active browser window
// inactive, but it will still be the last active browser. Attach to the
// last active browser if it's the foremost visible window, other than the
// system tray.
return IsBrowserWindowTopmostWindow(browser);
#else
return false;
#endif // BUILDFLAG(IS_WIN)
}
class BrowserAttachObservationImpl : public BrowserAttachObservation,
public BrowserListObserver,
public views::WidgetObserver {
public:
BrowserAttachObservationImpl(Profile* profile,
BrowserAttachObserver* observer)
: profile_(profile),
observer_(observer),
browser_list_observation_(this),
browser_widget_observations_(this) {
for (auto browser : *BrowserList::GetInstance()) {
OnBrowserAdded(browser);
}
browser_list_observation_.Observe(BrowserList::GetInstance());
current_value_ = FindBrowserForAttachment(profile_);
}
bool CanAttachToBrowser() const override { return current_value_ != nullptr; }
// BrowserListObserver implementation.
void OnBrowserSetLastActive(Browser* browser) override {
// BrowserList updates the active browser list before this call, so
// `CheckForChange` will find the correct browser.
CheckForChange();
}
void OnBrowserAdded(Browser* browser) override {
if (IsBrowserGlicCompatible(profile_, browser)) {
browser_widget_observations_.AddObservation(
browser->GetBrowserView().GetWidget());
}
}
void OnBrowserRemoved(Browser* browser) override {
if (current_value_ == browser) {
// BrowserList updates the active browser list before this call, so
// `CheckForChange` will find the correct browser.
CheckForChange();
}
}
// views::WidgetObserver implementation.
void OnWidgetVisibilityChanged(views::Widget* widget, bool visible) override {
// Note: visibility change takes effect after this call, so PostMessage is
// critical here.
check_for_change_timer_.Start(
FROM_HERE, base::TimeDelta(),
base::BindOnce(&BrowserAttachObservationImpl::CheckForChange,
base::Unretained(this)));
}
void OnWidgetShowStateChanged(views::Widget* widget) override {
CheckForChange();
}
void OnWidgetDestroyed(views::Widget* widget) override {
// Note: widget observer removal has to be done at widget destruction time
// because when OnBrowserRemoved is called, the widget has already
// been destroyed.
if (browser_widget_observations_.IsObservingSource(widget)) {
browser_widget_observations_.RemoveObservation(widget);
}
}
private:
void CheckForChange() {
SetBrowserForAttachment(FindBrowserForAttachment(profile_));
}
void SetBrowserForAttachment(Browser* browser) {
if (current_value_ == browser) {
return;
}
bool could_attach = current_value_ != nullptr;
bool can_attach = browser != nullptr;
current_value_ = browser;
observer_->BrowserForAttachmentChanged(browser);
if (could_attach != can_attach) {
observer_->CanAttachToBrowserChanged(can_attach);
}
}
raw_ptr<Profile> profile_;
raw_ptr<Browser> current_value_;
raw_ptr<BrowserAttachObserver> observer_;
base::OneShotTimer check_for_change_timer_;
base::ScopedObservation<BrowserList, BrowserListObserver>
browser_list_observation_;
base::ScopedMultiSourceObservation<views::Widget, views::WidgetObserver>
browser_widget_observations_;
};
std::unique_ptr<BrowserAttachObservation> ObserveBrowserForAttachment(
Profile* profile,
BrowserAttachObserver* observer) {
return std::make_unique<BrowserAttachObservationImpl>(profile, observer);
}
} // namespace glic
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