1 files changed, 62 insertions, 0 deletions
diff --git a/layout/generic/MiddleCroppingBlockFrame.h b/layout/generic/MiddleCroppingBlockFrame.h
new file mode 100644
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+++ b/layout/generic/MiddleCroppingBlockFrame.h
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+/* -*- 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_MiddleCroppingBlockFrame_h
+#define mozilla_MiddleCroppingBlockFrame_h
+
+#include "nsBlockFrame.h"
+#include "nsIAnonymousContentCreator.h"
+#include "nsQueryFrame.h"
+
+namespace mozilla {
+
+// A block frame that implements a simplistic version of middle-cropping. Note
+// that this is not fully l10n aware or complex-writing-system-friendly, so it's
+// generally mostly useful for filenames / urls / etc.
+class MiddleCroppingBlockFrame : public nsBlockFrame,
+                                 public nsIAnonymousContentCreator {
+ public:
+  virtual void GetUncroppedValue(nsAString&) = 0;
+  void UpdateDisplayedValueToUncroppedValue(bool aNotify);
+
+  NS_DECL_QUERYFRAME_TARGET(MiddleCroppingBlockFrame)
+  NS_DECL_QUERYFRAME
+  NS_DECL_ABSTRACT_FRAME(MiddleCroppingBlockFrame)
+
+ protected:
+  MiddleCroppingBlockFrame(ComputedStyle*, nsPresContext*, ClassID);
+
+  ~MiddleCroppingBlockFrame();
+
+  void Reflow(nsPresContext*, ReflowOutput&, const ReflowInput&,
+              nsReflowStatus&) override;
+
+  nscoord GetMinISize(gfxContext*) override;
+  nscoord GetPrefISize(gfxContext*) override;
+
+  /**
+   * Crop aText to fit inside aWidth using the styles of aFrame.
+   * @return true if aText was modified
+   */
+  bool CropTextToWidth(gfxContext& aRenderingContext, nscoord aWidth,
+                       nsString& aText) const;
+
+  nsresult CreateAnonymousContent(nsTArray<ContentInfo>&) override;
+  void AppendAnonymousContentTo(nsTArray<nsIContent*>&,
+                                uint32_t aFilter) override;
+
+  /**
+   * Updates the displayed value by using aValue.
+   */
+  void UpdateDisplayedValue(const nsAString& aValue, bool aNotify);
+  void Destroy(DestroyContext&) override;
+
+  RefPtr<dom::Text> mTextNode;
+};
+
+}  // namespace mozilla
+
+#endif