Bug 1833814 - change nsIWidget's cursor logic, r=emilio,win-reviewers,mhowell

Differential Revision: https://phabricator.services.mozilla.com/D195549

layout/xul/nsXULPopupManager.cpp

@@ -209,7 +209,44 @@ UniquePtr<nsMenuChainItem> nsMenuChainItem::Detach() {
   return std::move(mParent);
 }
 
+void nsXULPopupManager::AddMenuChainItem(UniquePtr<nsMenuChainItem> aItem) {
+  PopupType popupType = aItem->Frame()->GetPopupType();
+  if (StaticPrefs::layout_cursor_disable_for_popups() &&
+      popupType != PopupType::Tooltip) {
+    nsPresContext* rootPresContext =
+        aItem->Frame()->PresContext()->GetRootPresContext();
+    if (nsCOMPtr<nsIWidget> rootWidget = rootPresContext->GetRootWidget()) {
+      rootWidget->SetCustomCursorAllowed(false);
+    }
+  }
+
+  // popups normally hide when an outside click occurs. Panels may use
+  // the noautohide attribute to disable this behaviour. It is expected
+  // that the application will hide these popups manually. The tooltip
+  // listener will handle closing the tooltip also.
+  nsIContent* oldmenu = nullptr;
+  if (mPopups) {
+    oldmenu = mPopups->Element();
+  }
+  aItem->SetParent(std::move(mPopups));
+  mPopups = std::move(aItem);
+  SetCaptureState(oldmenu);
+}
+
 void nsXULPopupManager::RemoveMenuChainItem(nsMenuChainItem* aItem) {
+  nsPresContext* presContext =
+      aItem->Frame()->PresContext()->GetRootPresContext();
+  auto matcher = [&](nsMenuChainItem* aChainItem) -> bool {
+    return aChainItem != aItem &&
+           presContext ==
+               aChainItem->Frame()->PresContext()->GetRootPresContext();
+  };
+  nsCOMPtr<nsIWidget> rootWidget =
+      presContext->GetRootPresContext()->GetRootWidget();
+  if (!FirstMatchingPopup(matcher) && rootWidget) {
+    rootWidget->SetCustomCursorAllowed(true);
+  }
+
   auto parent = aItem->Detach();
   if (auto* child = aItem->GetChild()) {
     MOZ_ASSERT(aItem != mPopups,
@@ -225,6 +262,17 @@ void nsXULPopupManager::RemoveMenuChainItem(nsMenuChainItem* aItem) {
   }
 }
 
+nsMenuChainItem* nsXULPopupManager::FirstMatchingPopup(
+    mozilla::FunctionRef<bool(nsMenuChainItem*)> aMatcher) const {
+  for (nsMenuChainItem* popup = mPopups.get(); popup;
+       popup = popup->GetParent()) {
+    if (aMatcher(popup)) {
+      return popup;
+    }
+  }
+  return nullptr;
+}
+
 void nsMenuChainItem::UpdateFollowAnchor() {
   mFollowAnchor = mFrame->ShouldFollowAnchor(mCurrentRect);
 }
@@ -1140,17 +1188,7 @@ void nsXULPopupManager::ShowPopupCallback(Element* aPopup,
 
   item->UpdateFollowAnchor();
 
-  // popups normally hide when an outside click occurs. Panels may use
-  // the noautohide attribute to disable this behaviour. It is expected
-  // that the application will hide these popups manually. The tooltip
-  // listener will handle closing the tooltip also.
-  nsIContent* oldmenu = nullptr;
-  if (mPopups) {
-    oldmenu = mPopups->Element();
-  }
-  item->SetParent(std::move(mPopups));
-  mPopups = std::move(item);
-  SetCaptureState(oldmenu);
+  AddMenuChainItem(std::move(item));
   NS_ENSURE_TRUE_VOID(weakFrame.IsAlive());
 
   RefPtr popup = &aPopupFrame->PopupElement();
@@ -1166,12 +1204,10 @@ void nsXULPopupManager::ShowPopupCallback(Element* aPopup,
 }
 
 nsMenuChainItem* nsXULPopupManager::FindPopup(Element* aPopup) const {
-  for (nsMenuChainItem* item = mPopups.get(); item; item = item->GetParent()) {
-    if (item->Frame()->GetContent() == aPopup) {
-      return item;
-    }
-  }
-  return nullptr;
+  auto matcher = [&](nsMenuChainItem* aItem) -> bool {
+    return aItem->Frame()->GetContent() == aPopup;
+  };
+  return FirstMatchingPopup(matcher);
 }
 
 void nsXULPopupManager::HidePopup(Element* aPopup, HidePopupOptions aOptions,

layout/xul/nsXULPopupManager.h

@@ -23,6 +23,7 @@
 #include "nsIObserver.h"
 #include "nsThreadUtils.h"
 #include "mozilla/Attributes.h"
+#include "mozilla/FunctionRef.h"
 #include "mozilla/widget/InitData.h"
 #include "mozilla/widget/NativeMenu.h"
 
@@ -550,6 +551,13 @@ class nsXULPopupManager final : public nsIDOMEventListener,
    */
   void UpdatePopupPositions(nsRefreshDriver* aRefreshDriver);
 
+  /**
+   * Get the first nsMenuChainItem that is matched by the matching callback
+   * function provided.
+   */
+  nsMenuChainItem* FirstMatchingPopup(
+      mozilla::FunctionRef<bool(nsMenuChainItem*)> aMatcher) const;
+
   /**
    * Enable or disable anchor following on the popup if needed.
    */
@@ -733,6 +741,9 @@ class nsXULPopupManager final : public nsIDOMEventListener,
     return GetRollupItem(RollupKind::Menu);
   }
 
+  // Add the chain item to the chain and update mPopups to point to it.
+  void AddMenuChainItem(mozilla::UniquePtr<nsMenuChainItem>);
+
   // Removes the chain item from the chain and deletes it.
   void RemoveMenuChainItem(nsMenuChainItem*);
 

modules/libpref/init/StaticPrefList.yaml

@@ -8844,6 +8844,11 @@
   value: 32
   mirror: always
 
+- name: layout.cursor.disable-for-popups
+  type: bool
+  value: true
+  mirror: always
+
 - name: layout.display-list.build-twice
   type: RelaxedAtomicBool
   value: false

widget/cocoa/nsChildView.mm

@@ -625,9 +625,12 @@ void nsChildView::SetCursor(const Cursor& aCursor) {
 
   nsBaseWidget::SetCursor(aCursor);
 
-  if (NS_SUCCEEDED([[nsCursorManager sharedInstance]
-            setCustomCursor:aCursor
-          widgetScaleFactor:BackingScaleFactor()])) {
+  bool forceUpdate = mUpdateCursor;
+  mUpdateCursor = false;
+  if (mCustomCursorAllowed && NS_SUCCEEDED([[nsCursorManager sharedInstance]
+                                    setCustomCursor:aCursor
+                                  widgetScaleFactor:BackingScaleFactor()
+                                        forceUpdate:forceUpdate])) {
     return;
   }
 

widget/cocoa/nsCursorManager.h

@@ -36,7 +36,8 @@
 // As above, but returns an error if the cursor isn't custom or we couldn't set
 // it for some reason.
 - (nsresult)setCustomCursor:(const nsIWidget::Cursor&)aCursor
-          widgetScaleFactor:(CGFloat)aWidgetScaleFactor;
+          widgetScaleFactor:(CGFloat)aWidgetScaleFactor
+                forceUpdate:(bool)aForceUpdate;
 
 /*! @method     sharedInstance
     @abstract   Get the Singleton instance of the cursor manager.

widget/cocoa/nsCursorManager.mm

@@ -276,13 +276,14 @@ static constexpr nsCursor kCustomCursor = eCursorCount;
 }
 
 - (nsresult)setCustomCursor:(const nsIWidget::Cursor&)aCursor
-          widgetScaleFactor:(CGFloat)scaleFactor {
+          widgetScaleFactor:(CGFloat)scaleFactor
+                forceUpdate:(bool)aForceUpdate {
   NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
 
   // As the user moves the mouse, this gets called repeatedly with the same
   // aCursorImage
-  if (sCurrentCursor == aCursor && sCurrentCursorScaleFactor == scaleFactor &&
-      mCurrentMacCursor) {
+  if (!aForceUpdate && sCurrentCursor == aCursor &&
+      sCurrentCursorScaleFactor == scaleFactor && mCurrentMacCursor) {
     // Native dragging can unset our cursor apparently (see bug 1739352).
     if (MOZ_UNLIKELY(![mCurrentMacCursor isSet])) {
       [mCurrentMacCursor set];

widget/gtk/nsWindow.cpp

@@ -3328,7 +3328,10 @@ void nsWindow::SetCursor(const Cursor& aCursor) {
   mCursor = aCursor;
 
   // Try to set the cursor image first, and fall back to the numeric cursor.
-  GdkCursor* imageCursor = GetCursorForImage(aCursor, GdkCeiledScaleFactor());
+  GdkCursor* imageCursor = nullptr;
+  if (mCustomCursorAllowed) {
+    imageCursor = GetCursorForImage(aCursor, GdkCeiledScaleFactor());
+  }
 
   // When using a custom cursor, clear the cursor first using eCursor_none, in
   // order to work around https://gitlab.gnome.org/GNOME/gtk/-/issues/6242

widget/nsBaseWidget.cpp

@@ -701,6 +701,14 @@ void nsBaseWidget::MoveToWorkspace(const nsAString& workspaceID) {
 
 void nsBaseWidget::SetCursor(const Cursor& aCursor) { mCursor = aCursor; }
 
+void nsBaseWidget::SetCustomCursorAllowed(bool aIsAllowed) {
+  if (aIsAllowed != mCustomCursorAllowed) {
+    mCustomCursorAllowed = aIsAllowed;
+    mUpdateCursor = true;
+    SetCursor(mCursor);
+  }
+}
+
 //-------------------------------------------------------------------------
 //
 // Window transparency methods

widget/nsBaseWidget.h

@@ -187,6 +187,7 @@ class nsBaseWidget : public nsIWidget, public nsSupportsWeakReference {
   bool IsFullyOccluded() const override { return mIsFullyOccluded; }
 
   void SetCursor(const Cursor&) override;
+  void SetCustomCursorAllowed(bool) override;
   void ClearCachedCursor() final {
     mCursor = {};
     mUpdateCursor = true;
@@ -694,6 +695,7 @@ class nsBaseWidget : public nsIWidget, public nsSupportsWeakReference {
   RefPtr<mozilla::SwipeTracker> mSwipeTracker;
   mozilla::UniquePtr<mozilla::SwipeEventQueue> mSwipeEventQueue;
   Cursor mCursor;
+  bool mCustomCursorAllowed = true;
   BorderStyle mBorderStyle;
   LayoutDeviceIntRect mBounds;
   bool mIsTiled;

widget/nsIWidget.h

@@ -1014,6 +1014,8 @@ class nsIWidget : public nsISupports {
    */
   virtual void SetCursor(const Cursor&) = 0;
 
+  virtual void SetCustomCursorAllowed(bool) = 0;
+
   static nsIntSize CustomCursorSize(const Cursor&);
 
   /**

widget/windows/nsWindow.cpp

@@ -3031,7 +3031,10 @@ void nsWindow::SetCursor(const Cursor& aCursor) {
   sCurrentHCursorIsCustom = false;
   sCurrentCursor = aCursor;
 
-  HCURSOR cursor = CursorForImage(aCursor, GetDefaultScale());
+  HCURSOR cursor = nullptr;
+  if (mCustomCursorAllowed) {
+    cursor = CursorForImage(aCursor, GetDefaultScale());
+  }
   bool custom = false;
   if (cursor) {
     custom = true;