From 6bf0a5cb5034a7e684dcc3500e841785237ce2dd Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 19:32:43 +0200
Subject: Adding upstream version 1:115.7.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 dom/events/IMEStateManager.h | 494 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 494 insertions(+)
 create mode 100644 dom/events/IMEStateManager.h

(limited to 'dom/events/IMEStateManager.h')

diff --git a/dom/events/IMEStateManager.h b/dom/events/IMEStateManager.h
new file mode 100644
index 0000000000..1320fef8cc
--- /dev/null
+++ b/dom/events/IMEStateManager.h
@@ -0,0 +1,494 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_IMEStateManager_h_
+#define mozilla_IMEStateManager_h_
+
+#include "mozilla/EventForwards.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/dom/BrowserParent.h"
+#include "nsIWidget.h"
+
+class nsIContent;
+class nsINode;
+class nsPresContext;
+
+namespace mozilla {
+
+class EditorBase;
+class EventDispatchingCallback;
+class IMEContentObserver;
+class TextCompositionArray;
+class TextComposition;
+
+namespace dom {
+class Element;
+class Selection;
+}  // namespace dom
+
+/**
+ * IMEStateManager manages InputContext (e.g., active editor type, IME enabled
+ * state and IME open state) of nsIWidget instances, manages IMEContentObserver
+ * and provides useful API for IME.
+ */
+
+class IMEStateManager {
+  typedef dom::BrowserParent BrowserParent;
+  typedef widget::IMEMessage IMEMessage;
+  typedef widget::IMENotification IMENotification;
+  typedef widget::IMEState IMEState;
+  typedef widget::InputContext InputContext;
+  typedef widget::InputContextAction InputContextAction;
+
+ public:
+  static void Init();
+  static void Shutdown();
+
+  /**
+   * GetActiveBrowserParent() returns a pointer to a BrowserParent instance
+   * which is managed by the focused content (sFocusedElement).  If the focused
+   * content isn't managing another process, this returns nullptr.
+   */
+  static BrowserParent* GetActiveBrowserParent() {
+    // If menu has pseudo focus, we should ignore active child process.
+    if (sInstalledMenuKeyboardListener) {
+      return nullptr;
+    }
+    // If we know focused browser parent, use it for making any events related
+    // to composition go to same content process.
+    if (sFocusedIMEBrowserParent) {
+      return sFocusedIMEBrowserParent;
+    }
+    return BrowserParent::GetFocused();
+  }
+
+  /**
+   * DoesBrowserParentHaveIMEFocus() returns true when aBrowserParent has IME
+   * focus, i.e., the BrowserParent sent "focus" notification but not yet sends
+   * "blur". Note that this doesn't check if the remote processes are same
+   * because if another BrowserParent has focus, committing composition causes
+   * firing composition events in different BrowserParent.  (Anyway, such case
+   * shouldn't occur.)
+   */
+  static bool DoesBrowserParentHaveIMEFocus(
+      const BrowserParent* aBrowserParent) {
+    MOZ_ASSERT(aBrowserParent);
+    return sFocusedIMEBrowserParent == aBrowserParent;
+  }
+
+  /**
+   * If CanSendNotificationToWidget() returns false (it should occur
+   * only in a content process), we shouldn't notify the widget of
+   * any focused editor changes since the content process was blurred.
+   * Also, even if content process, widget has native text event dispatcher such
+   * as Android, it still notify it.
+   */
+  static bool CanSendNotificationToWidget() {
+#ifdef MOZ_WIDGET_ANDROID
+    return true;
+#else
+    return !sCleaningUpForStoppingIMEStateManagement;
+#endif
+  }
+
+  /**
+   * Focus moved between browsers from aBlur to aFocus. (nullptr means the
+   * chrome process.)
+   */
+  static void OnFocusMovedBetweenBrowsers(BrowserParent* aBlur,
+                                          BrowserParent* aFocus);
+
+  /**
+   * Called when aWidget is being deleted.
+   */
+  static void WidgetDestroyed(nsIWidget* aWidget);
+
+  /**
+   * Called when a widget exists when the app is quitting
+   */
+  static void WidgetOnQuit(nsIWidget* aWidget);
+
+  /**
+   * GetWidgetForActiveInputContext() returns a widget which IMEStateManager
+   * is managing input context with.  If a widget instance needs to cache
+   * the last input context for nsIWidget::GetInputContext() or something,
+   * it should check if its cache is valid with this method before using it
+   * because if this method returns another instance, it means that
+   * IMEStateManager may have already changed shared input context via the
+   * widget.
+   */
+  static nsIWidget* GetWidgetForActiveInputContext() {
+    return sActiveInputContextWidget;
+  }
+
+  /**
+   * SetIMEContextForChildProcess() is called when aBrowserParent receives
+   * SetInputContext() from the remote process.
+   */
+  static void SetInputContextForChildProcess(BrowserParent* aBrowserParent,
+                                             const InputContext& aInputContext,
+                                             const InputContextAction& aAction);
+
+  /**
+   * StopIMEStateManagement() is called when the process should stop managing
+   * IME state.
+   */
+  static void StopIMEStateManagement();
+
+  /**
+   * MaybeStartOffsetUpdatedInChild() is called when composition start offset
+   * is maybe updated in the child process.  I.e., even if it's not updated,
+   * this is called and never called if the composition is in this process.
+   * @param aWidget             The widget whose native IME context has the
+   *                            composition.
+   * @param aStartOffset        New composition start offset with native
+   *                            linebreaks.
+   */
+  static void MaybeStartOffsetUpdatedInChild(nsIWidget* aWidget,
+                                             uint32_t aStartOffset);
+
+  MOZ_CAN_RUN_SCRIPT static nsresult OnDestroyPresContext(
+      nsPresContext& aPresContext);
+  MOZ_CAN_RUN_SCRIPT static nsresult OnRemoveContent(
+      nsPresContext& aPresContext, dom::Element& aElement);
+  /**
+   * OnChangeFocus() should be called when focused content is changed or
+   * IME enabled state is changed.  If nobody has focus, set both aPresContext
+   * and aContent nullptr.  E.g., all windows are deactivated.  Otherwise,
+   * set focused element (even if it won't receive `focus`event) and
+   * corresponding nsPresContext for it.  Then, IMEStateManager can avoid
+   * handling delayed notifications from the others with verifying the
+   * focused element.
+   */
+  MOZ_CAN_RUN_SCRIPT static nsresult OnChangeFocus(
+      nsPresContext* aPresContext, dom::Element* aElement,
+      InputContextAction::Cause aCause);
+
+  /**
+   * OnInstalledMenuKeyboardListener() is called when menu keyboard listener
+   * is installed or uninstalled in the process.  So, even if menu keyboard
+   * listener was installed in chrome process, this won't be called in content
+   * processes.
+   *
+   * @param aInstalling     true if menu keyboard listener is installed.
+   *                        Otherwise, i.e., menu keyboard listener is
+   *                        uninstalled, false.
+   */
+  MOZ_CAN_RUN_SCRIPT static void OnInstalledMenuKeyboardListener(
+      bool aInstalling);
+
+  // These two methods manage focus and selection/text observers.
+  // They are separate from OnChangeFocus above because this offers finer
+  // control compared to having the two methods incorporated into OnChangeFocus
+
+  // Get the focused editor's selection and root
+  static nsresult GetFocusSelectionAndRootElement(dom::Selection** aSel,
+                                                  dom::Element** aRootElement);
+  // This method updates the current IME state.  However, if the enabled state
+  // isn't changed by the new state, this method does nothing.
+  // Note that this method changes the IME state of the active element in the
+  // widget.  So, the caller must have focus.
+  // XXX Changing this to MOZ_CAN_RUN_SCRIPT requires too many callers to be
+  //     marked too.  Probably, we should initialize IMEContentObserver
+  //     asynchronously.
+  enum class UpdateIMEStateOption {
+    ForceUpdate,
+    DontCommitComposition,
+  };
+  using UpdateIMEStateOptions = EnumSet<UpdateIMEStateOption, uint32_t>;
+  MOZ_CAN_RUN_SCRIPT static void UpdateIMEState(
+      const IMEState& aNewIMEState, dom::Element* aElement,
+      EditorBase& aEditorBase, const UpdateIMEStateOptions& aOptions = {});
+
+  // This method is called when user operates mouse button in focused editor
+  // and before the editor handles it.
+  // Returns true if IME consumes the event.  Otherwise, false.
+  MOZ_CAN_RUN_SCRIPT static bool OnMouseButtonEventInEditor(
+      nsPresContext& aPresContext, dom::Element* aElement,
+      WidgetMouseEvent& aMouseEvent);
+
+  // This method is called when user clicked in an editor.
+  // aElement must be:
+  //   If the editor is for <input> or <textarea>, the element.
+  //   If the editor is for contenteditable, the active editinghost.
+  //   If the editor is for designMode, nullptr.
+  MOZ_CAN_RUN_SCRIPT static void OnClickInEditor(
+      nsPresContext& aPresContext, dom::Element* aElement,
+      const WidgetMouseEvent& aMouseEvent);
+
+  // This method is called when editor actually gets focus.
+  // aContent must be:
+  //   If the editor is for <input> or <textarea>, the element.
+  //   If the editor is for contenteditable, the active editinghost.
+  //   If the editor is for designMode, nullptr.
+  static void OnFocusInEditor(nsPresContext& aPresContext,
+                              dom::Element* aElement, EditorBase& aEditorBase);
+
+  // This method is called when the editor is initialized.
+  static void OnEditorInitialized(EditorBase& aEditorBase);
+
+  // This method is called when the editor is (might be temporarily) being
+  // destroyed.
+  static void OnEditorDestroying(EditorBase& aEditorBase);
+
+  // This method is called when focus is set to same content again.
+  MOZ_CAN_RUN_SCRIPT static void OnReFocus(nsPresContext& aPresContext,
+                                           dom::Element& aElement);
+
+  // This method is called when designMode is set to "off" or an editing host
+  // becomes not editable due to removing `contenteditable` attribute or setting
+  // it to "false".
+  MOZ_CAN_RUN_SCRIPT static void MaybeOnEditableStateDisabled(
+      nsPresContext& aPresContext, dom::Element* aElement);
+
+  /**
+   * All composition events must be dispatched via DispatchCompositionEvent()
+   * for storing the composition target and ensuring a set of composition
+   * events must be fired the stored target.  If the stored composition event
+   * target is destroying, this removes the stored composition automatically.
+   */
+  MOZ_CAN_RUN_SCRIPT static void DispatchCompositionEvent(
+      nsINode* aEventTargetNode, nsPresContext* aPresContext,
+      BrowserParent* aBrowserParent, WidgetCompositionEvent* aCompositionEvent,
+      nsEventStatus* aStatus, EventDispatchingCallback* aCallBack,
+      bool aIsSynthesized = false);
+
+  /**
+   * All selection events must be handled via HandleSelectionEvent()
+   * because they must be handled by same target as composition events when
+   * there is a composition.
+   */
+  MOZ_CAN_RUN_SCRIPT
+  static void HandleSelectionEvent(nsPresContext* aPresContext,
+                                   nsIContent* aEventTargetContent,
+                                   WidgetSelectionEvent* aSelectionEvent);
+
+  /**
+   * This is called when PresShell ignores a composition event due to not safe
+   * to dispatch events.
+   */
+  static void OnCompositionEventDiscarded(
+      WidgetCompositionEvent* aCompositionEvent);
+
+  /**
+   * Get TextComposition from widget.
+   */
+  static already_AddRefed<TextComposition> GetTextCompositionFor(
+      nsIWidget* aWidget);
+
+  /**
+   * Returns TextComposition instance for the event.
+   */
+  static already_AddRefed<TextComposition> GetTextCompositionFor(
+      const WidgetCompositionEvent* aCompositionEvent);
+
+  /**
+   * Returns TextComposition instance for the pres context.
+   * Be aware, even if another pres context which shares native IME context with
+   * specified pres context has composition, this returns nullptr.
+   */
+  static already_AddRefed<TextComposition> GetTextCompositionFor(
+      nsPresContext* aPresContext);
+
+  /**
+   * Send a notification to IME.  It depends on the IME or platform spec what
+   * will occur (or not occur).
+   */
+  static nsresult NotifyIME(const IMENotification& aNotification,
+                            nsIWidget* aWidget,
+                            BrowserParent* aBrowserParent = nullptr);
+  static nsresult NotifyIME(IMEMessage aMessage, nsIWidget* aWidget,
+                            BrowserParent* aBrowserParent = nullptr);
+  static nsresult NotifyIME(IMEMessage aMessage, nsPresContext* aPresContext,
+                            BrowserParent* aBrowserParent = nullptr);
+
+  static nsINode* GetRootEditableNode(const nsPresContext& aPresContext,
+                                      const dom::Element* aElement);
+
+  /**
+   * Returns active IMEContentObserver but may be nullptr if focused content
+   * isn't editable or focus in a remote process.
+   */
+  static IMEContentObserver* GetActiveContentObserver();
+
+  /**
+   * Return focused element which was notified by a OnChangeFocus() call.
+   */
+  static dom::Element* GetFocusedElement();
+
+ protected:
+  MOZ_CAN_RUN_SCRIPT static nsresult OnChangeFocusInternal(
+      nsPresContext* aPresContext, dom::Element* aElement,
+      InputContextAction aAction);
+  MOZ_CAN_RUN_SCRIPT static void SetIMEState(const IMEState& aState,
+                                             const nsPresContext* aPresContext,
+                                             dom::Element* aElement,
+                                             nsIWidget& aWidget,
+                                             InputContextAction aAction,
+                                             InputContext::Origin aOrigin);
+  static void SetInputContext(nsIWidget& aWidget,
+                              const InputContext& aInputContext,
+                              const InputContextAction& aAction);
+  static IMEState GetNewIMEState(const nsPresContext& aPresContext,
+                                 dom::Element* aElement);
+
+  static void EnsureTextCompositionArray();
+
+  // XXX Changing this to MOZ_CAN_RUN_SCRIPT requires too many callers to be
+  //     marked too.  Probably, we should initialize IMEContentObserver
+  //     asynchronously.
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY static void CreateIMEContentObserver(
+      EditorBase& aEditorBase, dom::Element* aFocusedElement);
+
+  /**
+   * Check whether the content matches or does not match with focus information
+   * which is previously notified via OnChangeFocus();
+   */
+  [[nodiscard]] static bool IsFocusedElement(
+      const nsPresContext& aPresContext, const dom::Element* aFocusedElement);
+
+  static void DestroyIMEContentObserver();
+
+  [[nodiscard]] static bool IsEditable(nsINode* node);
+
+  [[nodiscard]] static bool IsIMEObserverNeeded(const IMEState& aState);
+
+  [[nodiscard]] static nsIContent* GetRootContent(nsPresContext* aPresContext);
+
+  /**
+   * CanHandleWith() returns false if it's destroyed.
+   */
+  [[nodiscard]] static bool CanHandleWith(const nsPresContext* aPresContext);
+
+  /**
+   * ResetActiveChildInputContext() resets sActiveChildInputContext.
+   * So, HasActiveChildSetInputContext() will return false until a remote
+   * process gets focus and set input context.
+   */
+  static void ResetActiveChildInputContext();
+
+  /**
+   * HasActiveChildSetInputContext() returns true if a remote tab has focus
+   * and it has already set input context.  Otherwise, returns false.
+   */
+  static bool HasActiveChildSetInputContext();
+
+  // sFocusedElement and sFocusedPresContext are the focused content and
+  // PresContext.  If a document has focus but there is no focused element,
+  // sFocusedElement may be nullptr.
+  static StaticRefPtr<dom::Element> sFocusedElement;
+  static StaticRefPtr<nsPresContext> sFocusedPresContext;
+  // sTextInputHandlingWidget is cache for the result of
+  // sFocusedPresContext->GetTextInputHandlingWidget().  Even after
+  // sFocusedPresContext has gone, we need to clean up some IME state on the
+  // widget if the widget is available.
+  // Note that this is cleared when the widget is being destroyed.
+  static nsIWidget* sTextInputHandlingWidget;
+  // sFocusedIMEBrowserParent is the tab parent, which send "focus" notification
+  // to sFocusedIMEWidget (and didn't yet sent "blur" notification).
+  // Note that this is cleared when the widget is being destroyed.
+  static nsIWidget* sFocusedIMEWidget;
+  static StaticRefPtr<BrowserParent> sFocusedIMEBrowserParent;
+  // sActiveInputContextWidget is the last widget whose SetInputContext() is
+  // called.  This is important to reduce sync IPC cost with parent process.
+  // If IMEStateManager set input context to different widget, PuppetWidget can
+  // return cached input context safely.
+  // Note that this is cleared when the widget is being destroyed.
+  static nsIWidget* sActiveInputContextWidget;
+  // sActiveIMEContentObserver points to the currently active
+  // IMEContentObserver.  This is null if there is no focused editor.
+  static StaticRefPtr<IMEContentObserver> sActiveIMEContentObserver;
+
+  // All active compositions in the process are stored by this array.
+  // When you get an item of this array and use it, please be careful.
+  // The instances in this array can be destroyed automatically if you do
+  // something to cause committing or canceling the composition.
+  static TextCompositionArray* sTextCompositions;
+
+  // Origin type of current process.
+  static InputContext::Origin sOrigin;
+
+  // sActiveChildInputContext is valid only when BrowserParent::GetFocused() is
+  // not nullptr.  This stores last information of input context in the remote
+  // process of BrowserParent::GetFocused().  I.e., they are set when
+  // SetInputContextForChildProcess() is called.  This is necessary for
+  // restoring IME state when menu keyboard listener is uninstalled.
+  static InputContext sActiveChildInputContext;
+
+  // sInstalledMenuKeyboardListener is true if menu keyboard listener is
+  // installed in the process.
+  static bool sInstalledMenuKeyboardListener;
+
+  static bool sIsGettingNewIMEState;
+  static bool sCheckForIMEUnawareWebApps;
+
+  // Set to true only if this is an instance in a content process and
+  // only while `IMEStateManager::StopIMEStateManagement()`.
+  static bool sCleaningUpForStoppingIMEStateManagement;
+
+  // Set to true when:
+  // - In the main process, a window belonging to this app is active in the
+  //   desktop.
+  // - In a content process, the process has focus.
+  //
+  // This is updated by `OnChangeFocusInternal()` is called in the main
+  // process.  Therefore, this indicates the active state which
+  // `IMEStateManager` notified the focus change, there is timelag from
+  // the `nsFocusManager`'s status update.  This allows that all methods
+  // to handle something specially when they are called while the process
+  // is being activated or inactivated.  E.g., `OnFocusMovedBetweenBrowsers()`
+  // is called twice before `OnChangeFocusInternal()` when the main process
+  // becomes active.  In this case, it wants to wait a following call of
+  // `OnChangeFocusInternal()` to keep active composition.  See also below.
+  static bool sIsActive;
+
+  // While the application is being activated, `OnFocusMovedBetweenBrowsers()`
+  // are called twice before `OnChangeFocusInternal()`.  First time, aBlur is
+  // the last focused `BrowserParent` at deactivating and aFocus is always
+  // `nullptr`.  Then, it'll be called again with actually focused
+  // `BrowserParent` when a content in a remote process has focus.  If we need
+  // to keep active composition while all windows are deactivated, we shouldn't
+  // commit it at the first call since usually, the second call's aFocus
+  // and the first call's aBlur are same `BrowserParent`.  For solving this
+  // issue, we need to merge the given `BrowserParent`s of multiple calls of
+  // `OnFocusMovedBetweenBrowsers()`. The following struct is the data for
+  // calling `OnFocusMovedBetweenBrowsers()` later from
+  // `OnChangeFocusInternal()`.  Note that focus can be moved even while the
+  // main process is not active because JS can change focus.  In such case,
+  // composition is committed at that time.  Therefore, this is required only
+  // when the main process is activated and there is a composition in a remote
+  // process.
+  struct PendingFocusedBrowserSwitchingData final {
+    RefPtr<BrowserParent> mBrowserParentBlurred;
+    RefPtr<BrowserParent> mBrowserParentFocused;
+
+    PendingFocusedBrowserSwitchingData() = delete;
+    explicit PendingFocusedBrowserSwitchingData(BrowserParent* aBlur,
+                                                BrowserParent* aFocus)
+        : mBrowserParentBlurred(aBlur), mBrowserParentFocused(aFocus) {}
+  };
+  static Maybe<PendingFocusedBrowserSwitchingData>
+      sPendingFocusedBrowserSwitchingData;
+
+  class MOZ_STACK_CLASS GettingNewIMEStateBlocker final {
+   public:
+    GettingNewIMEStateBlocker()
+        : mOldValue(IMEStateManager::sIsGettingNewIMEState) {
+      IMEStateManager::sIsGettingNewIMEState = true;
+    }
+    ~GettingNewIMEStateBlocker() {
+      IMEStateManager::sIsGettingNewIMEState = mOldValue;
+    }
+
+   private:
+    bool mOldValue;
+  };
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_IMEStateManager_h_
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