layout/generic/MiddleCroppingBlockFrame.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_MiddleCroppingBlockFrame_h
   8 #define mozilla_MiddleCroppingBlockFrame_h
   9
  10 #include "nsBlockFrame.h"
  11 #include "nsIAnonymousContentCreator.h"
  12 #include "nsQueryFrame.h"
  13
  14 namespace mozilla {
  15
  16 // A block frame that implements a simplistic version of middle-cropping. Note
  17 // that this is not fully l10n aware or complex-writing-system-friendly, so it's
  18 // generally mostly useful for filenames / urls / etc.
  19 class MiddleCroppingBlockFrame : public nsBlockFrame,
  20                                  public nsIAnonymousContentCreator {
  21  public:
  22   virtual void GetUncroppedValue(nsAString&) = 0;
  23   void UpdateDisplayedValueToUncroppedValue(bool aNotify);
  24
  25   NS_DECL_QUERYFRAME_TARGET(MiddleCroppingBlockFrame)
  26   NS_DECL_QUERYFRAME
  27   NS_DECL_ABSTRACT_FRAME(MiddleCroppingBlockFrame)
  28
  29  protected:
  30   MiddleCroppingBlockFrame(ComputedStyle*, nsPresContext*, ClassID);
  31
  32   ~MiddleCroppingBlockFrame();
  33
  34   void Reflow(nsPresContext*, ReflowOutput&, const ReflowInput&,
  35               nsReflowStatus&) override;
  36
  37   nscoord GetMinISize(gfxContext*) override;
  38   nscoord GetPrefISize(gfxContext*) override;
  39
  40   /**
  41    * Crop aText to fit inside aWidth using the styles of aFrame.
  42    * @return true if aText was modified
  43    */
  44   bool CropTextToWidth(gfxContext& aRenderingContext, nscoord aWidth,
  45                        nsString& aText) const;
  46
  47   nsresult CreateAnonymousContent(nsTArray<ContentInfo>&) override;
  48   void AppendAnonymousContentTo(nsTArray<nsIContent*>&,
  49                                 uint32_t aFilter) override;
  50
  51   /**
  52    * Updates the displayed value by using aValue.
  53    */
  54   void UpdateDisplayedValue(const nsAString& aValue, bool aIsCropped,
  55                             bool aNotify);
  56   void Destroy(DestroyContext&) override;
  57
  58   RefPtr<dom::Text> mTextNode;
  59   bool mCropped = false;
  60 };
  61
  62 }  // namespace mozilla
  63
  64 #endif