1 files changed, 84 insertions, 0 deletions
diff --git a/widget/ContentData.h b/widget/ContentData.h
new file mode 100644
index 0000000000..3e641a2684
--- /dev/null
+++ b/widget/ContentData.h
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+/* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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_ContentData_h
+#define mozilla_ContentData_h
+
+#include <sstream>
+
+#include "mozilla/Attributes.h"
+#include "mozilla/Debug.h"
+#include "mozilla/EventForwards.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/WritingModes.h"
+#include "mozilla/widget/IMEData.h"
+
+/**
+ * This file is intended for declaring classes which store DOM content data for
+ * widget classes.  Those data should be retrived by `WidgetQueryContentEvent`,
+ * notified with `IMENotification`, or set assumed data as result of dispatching
+ * widget events such as `WidgetKeyboardEvent`, `WidgetCompositionEvent`,
+ * `WidgetSelectionEvent` etc.
+ */
+
+namespace mozilla {
+
+/**
+ * ContentSelection stores DOM selection in flattend text by
+ * ContentEventHandler.  It should be retrieved with `eQuerySelectedText` event,
+ * notified with `NOTIFY_IME_OF_SELECTION_CHANGE` or set by widget itself.
+ */
+class ContentSelection {
+ public:
+  using SelectionChangeDataBase =
+      widget::IMENotification::SelectionChangeDataBase;
+  ContentSelection() = default;
+  explicit ContentSelection(const SelectionChangeDataBase& aSelectionChangeData)
+      : mOffsetAndData(Some(aSelectionChangeData.ToUint32OffsetAndData())),
+        mWritingMode(aSelectionChangeData.GetWritingMode()) {}
+  explicit ContentSelection(const WidgetQueryContentEvent& aSelectedTextEvent);
+  ContentSelection(uint32_t aOffset, const WritingMode& aWritingMode)
+      : mOffsetAndData(Some(OffsetAndData<uint32_t>(
+            aOffset, EmptyString(), OffsetAndDataFor::SelectedString))),
+        mWritingMode(aWritingMode) {}
+
+  const OffsetAndData<uint32_t>& OffsetAndDataRef() const {
+    return mOffsetAndData.ref();
+  }
+
+  void Collapse(uint32_t aOffset) {
+    if (mOffsetAndData.isSome()) {
+      mOffsetAndData->Collapse(aOffset);
+    } else {
+      mOffsetAndData.emplace(aOffset, EmptyString(),
+                             OffsetAndDataFor::SelectedString);
+    }
+  }
+  void Clear() {
+    mOffsetAndData.reset();
+    mWritingMode = WritingMode();
+  }
+
+  bool HasRange() const { return mOffsetAndData.isSome(); }
+  const WritingMode& WritingModeRef() const { return mWritingMode; }
+
+  friend std::ostream& operator<<(std::ostream& aStream,
+                                  const ContentSelection& aContentSelection) {
+    if (aContentSelection.HasRange()) {
+      return aStream << "{ HasRange()=false }";
+    }
+    aStream << "{ mOffsetAndData=" << aContentSelection.mOffsetAndData
+            << ", mWritingMode=" << aContentSelection.mWritingMode << " }";
+    return aStream;
+  }
+
+ private:
+  Maybe<OffsetAndData<uint32_t>> mOffsetAndData;
+  WritingMode mWritingMode;
+};
+
+}  // namespace mozilla
+
+#endif  // #ifndef mozilla_ContentData_h