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 aIsCropped,

                            bool aNotify);

  void Destroy(DestroyContext&) override;

  RefPtr<dom::Text> mTextNode;

  bool mCropped = false;

};

}  // namespace mozilla

#endif