Add observers to UndoManager.
Observers are notified when the internal state of UndoManager changes.
BUG=361413
Review URL: https://codereview.chromium.org/231073003
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@264001 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/undo/undo_manager.cc b/chrome/browser/undo/undo_manager.cc
index 89ffe30..94e28f4 100644
--- a/chrome/browser/undo/undo_manager.cc
+++ b/chrome/browser/undo/undo_manager.cc
@@ -6,6 +6,7 @@
#include "base/auto_reset.h"
#include "base/logging.h"
+#include "chrome/browser/undo/undo_manager_observer.h"
#include "chrome/browser/undo/undo_operation.h"
#include "grit/generated_resources.h"
#include "ui/base/l10n/l10n_util.h"
@@ -165,6 +166,16 @@
DCHECK(!group_actions_count_);
undo_actions_.clear();
redo_actions_.clear();
+
+ NotifyOnUndoManagerStateChange();
+}
+
+void UndoManager::AddObserver(UndoManagerObserver* observer) {
+ observers_.AddObserver(observer);
+}
+
+void UndoManager::RemoveObserver(UndoManagerObserver* observer) {
+ observers_.RemoveObserver(observer);
}
void UndoManager::Undo(bool* performing_indicator,
@@ -185,6 +196,13 @@
StartGroupingActions();
action->Undo();
EndGroupingActions();
+
+ NotifyOnUndoManagerStateChange();
+}
+
+void UndoManager::NotifyOnUndoManagerStateChange() {
+ FOR_EACH_OBSERVER(
+ UndoManagerObserver, observers_, OnUndoManagerStateChange());
}
void UndoManager::AddUndoGroup(UndoGroup* new_undo_group) {
@@ -197,6 +215,8 @@
// Limit the number of undo levels so the undo stack does not grow unbounded.
if (GetActiveUndoGroup()->size() > kMaxUndoGroups)
GetActiveUndoGroup()->erase(GetActiveUndoGroup()->begin());
+
+ NotifyOnUndoManagerStateChange();
}
ScopedVector<UndoGroup>* UndoManager::GetActiveUndoGroup() {
