chrome: Add support for CefBrowserViewDelegate::OnGestureCommand

include/capi/views/cef_browser_view_delegate_capi.h

@@ -33,7 +33,7 @@
 // by hand. See the translator.README.txt file in the tools directory for
 // more information.
 //
-// $hash=94e93810316b74e54eb315d97c6fc6f1cc0c9cc5$
+// $hash=d49d6b19e52e8a0496c69ec5cbd00750f7ac4740$
 //
 
 #ifndef CEF_INCLUDE_CAPI_VIEWS_CEF_BROWSER_VIEW_DELEGATE_CAPI_H_
@@ -124,9 +124,8 @@ typedef struct _cef_browser_view_delegate_t {
   ///
   /// Called when |browser_view| receives a gesture command. Return true (1) to
   /// handle (or disable) a |gesture_command| or false (0) to propagate the
-  /// gesture to the browser for default handling. This function will only be
-  /// called with the Alloy runtime. To handle these commands with the Chrome
-  /// runtime implement cef_command_handler_t::OnChromeCommand instead.
+  /// gesture to the browser for default handling. With the Chrome runtime these
+  /// commands can also be handled via cef_command_handler_t::OnChromeCommand.
   ///
   int(CEF_CALLBACK* on_gesture_command)(
       struct _cef_browser_view_delegate_t* self,

include/views/cef_browser_view_delegate.h

@@ -118,9 +118,8 @@ class CefBrowserViewDelegate : public CefViewDelegate {
   ///
   /// Called when |browser_view| receives a gesture command. Return true to
   /// handle (or disable) a |gesture_command| or false to propagate the gesture
-  /// to the browser for default handling. This method will only be called with
-  /// the Alloy runtime. To handle these commands with the Chrome runtime
-  /// implement CefCommandHandler::OnChromeCommand instead.
+  /// to the browser for default handling. With the Chrome runtime these
+  /// commands can also be handled via CefCommandHandler::OnChromeCommand.
   ///
   /*--cef()--*/
   virtual bool OnGestureCommand(CefRefPtr<CefBrowserView> browser_view,

libcef/browser/chrome/views/chrome_browser_view.cc

@@ -70,6 +70,13 @@ void ChromeBrowserView::OnBoundsChanged(const gfx::Rect& previous_bounds) {
   browser_view_delegate_->OnBoundsChanged();
 }
 
+void ChromeBrowserView::OnGestureEvent(ui::GestureEvent* event) {
+  if (browser_view_delegate_->OnGestureEvent(event)) {
+    return;
+  }
+  ParentClass::OnGestureEvent(event);
+}
+
 ToolbarView* ChromeBrowserView::OverrideCreateToolbar(
     Browser* browser,
     BrowserView* browser_view) {

libcef/browser/chrome/views/chrome_browser_view.h

@@ -45,6 +45,7 @@ class ChromeBrowserView
       const views::ViewHierarchyChangedDetails& details) override;
   void AddedToWidget() override;
   void OnBoundsChanged(const gfx::Rect& previous_bounds) override;
+  void OnGestureEvent(ui::GestureEvent* event) override;
 
   // BrowserView methods:
   ToolbarView* OverrideCreateToolbar(Browser* browser,

libcef/browser/views/browser_view_impl.cc

@@ -13,8 +13,27 @@
 #include "libcef/browser/views/window_impl.h"
 
 #include "content/public/browser/native_web_keyboard_event.h"
+#include "third_party/abseil-cpp/absl/types/optional.h"
 #include "ui/content_accelerators/accelerator_util.h"
 
+namespace {
+
+absl::optional<cef_gesture_command_t> GetGestureCommand(
+    ui::GestureEvent* event) {
+#if BUILDFLAG(IS_MAC)
+  if (event->details().type() == ui::ET_GESTURE_SWIPE) {
+    if (event->details().swipe_left()) {
+      return CEF_GESTURE_COMMAND_BACK;
+    } else if (event->details().swipe_right()) {
+      return CEF_GESTURE_COMMAND_FORWARD;
+    }
+  }
+#endif
+  return absl::nullopt;
+}
+
+}  // namespace
+
 // static
 CefRefPtr<CefBrowserView> CefBrowserView::CreateBrowserView(
     CefRefPtr<CefClient> client,
@@ -218,21 +237,27 @@ void CefBrowserViewImpl::OnBoundsChanged() {
   }
 }
 
-void CefBrowserViewImpl::OnGestureCommand(cef_gesture_command_t command) {
-  if (delegate()->OnGestureCommand(this, command)) {
-    return;
-  }
+bool CefBrowserViewImpl::OnGestureEvent(ui::GestureEvent* event) {
+  if (auto command = GetGestureCommand(event)) {
+    if (delegate() && delegate()->OnGestureCommand(this, *command)) {
+      return true;
+    }
 
-  if (browser_) {
-    switch (command) {
-      case CEF_GESTURE_COMMAND_BACK:
-        browser_->GoBack();
-        break;
-      case CEF_GESTURE_COMMAND_FORWARD:
-        browser_->GoForward();
-        break;
+    if (!cef::IsChromeRuntimeEnabled() && browser_) {
+      // Default handling for the Alloy runtime.
+      switch (*command) {
+        case CEF_GESTURE_COMMAND_BACK:
+          browser_->GoBack();
+          break;
+        case CEF_GESTURE_COMMAND_FORWARD:
+          browser_->GoForward();
+          break;
+      }
+      return true;
     }
   }
+
+  return false;
 }
 
 CefBrowserViewImpl::CefBrowserViewImpl(

libcef/browser/views/browser_view_impl.h

@@ -74,7 +74,7 @@ class CefBrowserViewImpl
   // CefBrowserViewView::Delegate methods:
   void OnBrowserViewAdded() override;
   void OnBoundsChanged() override;
-  void OnGestureCommand(cef_gesture_command_t command) override;
+  bool OnGestureEvent(ui::GestureEvent* event) override;
 
   // Return the WebView representation of this object.
   views::WebView* web_view() const;

libcef/browser/views/browser_view_view.cc

@@ -4,28 +4,8 @@
 
 #include "libcef/browser/views/browser_view_view.h"
 
-#include <optional>
-
 #include "libcef/browser/views/browser_view_impl.h"
 
-namespace {
-
-std::optional<cef_gesture_command_t> GetGestureCommand(
-    ui::GestureEvent* event) {
-#if defined(OS_MAC)
-  if (event->details().type() == ui::ET_GESTURE_SWIPE) {
-    if (event->details().swipe_left()) {
-      return cef_gesture_command_t::CEF_GESTURE_COMMAND_BACK;
-    } else if (event->details().swipe_right()) {
-      return cef_gesture_command_t::CEF_GESTURE_COMMAND_FORWARD;
-    }
-  }
-#endif
-  return std::nullopt;
-}
-
-}  // namespace
-
 CefBrowserViewView::CefBrowserViewView(CefBrowserViewDelegate* cef_delegate,
                                        Delegate* browser_view_delegate)
     : ParentClass(cef_delegate), browser_view_delegate_(browser_view_delegate) {
@@ -60,7 +40,8 @@ void CefBrowserViewView::OnBoundsChanged(const gfx::Rect& previous_bounds) {
 }
 
 void CefBrowserViewView::OnGestureEvent(ui::GestureEvent* event) {
-  if (auto command = GetGestureCommand(event)) {
-    browser_view_delegate_->OnGestureCommand(*command);
+  if (browser_view_delegate_->OnGestureEvent(event)) {
+    return;
   }
+  ParentClass::OnGestureEvent(event);
 }

libcef/browser/views/browser_view_view.h

@@ -41,8 +41,9 @@ class CefBrowserViewView
     // Called when the BrowserView bounds have changed.
     virtual void OnBoundsChanged() = 0;
 
-    // Called when the BrowserView receives a gesture command.
-    virtual void OnGestureCommand(cef_gesture_command_t command) = 0;
+    // Called when the BrowserView receives a gesture event.
+    // Returns true if the gesture was handled.
+    virtual bool OnGestureEvent(ui::GestureEvent* event) = 0;
 
    protected:
     virtual ~Delegate() {}