DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (5350524bb654)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217
/* -*- Mode: C++; tab-width: 2; 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 nsListBoxBodyFrame_h
#define nsListBoxBodyFrame_h

#include "mozilla/Attributes.h"
#include "nsCOMPtr.h"
#include "nsBoxFrame.h"
#include "nsIScrollbarMediator.h"
#include "nsIReflowCallback.h"
#include "nsBoxLayoutState.h"
#include "nsThreadUtils.h"
#include "nsPIBoxObject.h"

class nsPresContext;
class nsListScrollSmoother;
nsIFrame* NS_NewListBoxBodyFrame(nsIPresShell* aPresShell,
                                 nsStyleContext* aContext);

class nsListBoxBodyFrame final : public nsBoxFrame,
                                 public nsIScrollbarMediator,
                                 public nsIReflowCallback
{
  nsListBoxBodyFrame(nsStyleContext* aContext,
                     nsBoxLayout* aLayoutManager);
  virtual ~nsListBoxBodyFrame();

public:
  NS_DECL_QUERYFRAME_TARGET(nsListBoxBodyFrame)
  NS_DECL_QUERYFRAME
  NS_DECL_FRAMEARENA_HELPERS

  // non-virtual ListBoxObject
  int32_t GetNumberOfVisibleRows();
  int32_t GetIndexOfFirstVisibleRow();
  nsresult EnsureIndexIsVisible(int32_t aRowIndex);
  nsresult ScrollToIndex(int32_t aRowIndex);
  nsresult ScrollByLines(int32_t aNumLines);
  nsresult GetItemAtIndex(int32_t aIndex, nsIDOMElement **aResult);
  nsresult GetIndexOfItem(nsIDOMElement *aItem, int32_t *aResult);

  friend nsIFrame* NS_NewListBoxBodyFrame(nsIPresShell* aPresShell,
                                          nsStyleContext* aContext);
  
  // nsIFrame
  virtual void Init(nsIContent*       aContent,
                    nsContainerFrame* aParent, 
                    nsIFrame*         aPrevInFlow) override;
  virtual void DestroyFrom(nsIFrame* aDestructRoot) override;

  virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsIAtom* aAttribute, int32_t aModType) override;

  // nsIScrollbarMediator
  virtual void ScrollByPage(nsScrollbarFrame* aScrollbar, int32_t aDirection,
                            nsIScrollbarMediator::ScrollSnapMode snapMode
                              = nsIScrollbarMediator::DISABLE_SNAP) override;
  virtual void ScrollByWhole(nsScrollbarFrame* aScrollbar, int32_t aDirection,
                             nsIScrollbarMediator::ScrollSnapMode snapMode
                               = nsIScrollbarMediator::DISABLE_SNAP) override;
  virtual void ScrollByLine(nsScrollbarFrame* aScrollbar, int32_t aDirection,
                            nsIScrollbarMediator::ScrollSnapMode snapMode
                              = nsIScrollbarMediator::DISABLE_SNAP) override;
  virtual void RepeatButtonScroll(nsScrollbarFrame* aScrollbar) override;
  virtual void ThumbMoved(nsScrollbarFrame* aScrollbar,
                          int32_t aOldPos,
                          int32_t aNewPos) override;
  virtual void ScrollbarReleased(nsScrollbarFrame* aScrollbar) override {}
  virtual void VisibilityChanged(bool aVisible) override;
  virtual nsIFrame* GetScrollbarBox(bool aVertical) override;
  virtual void ScrollbarActivityStarted() const override {}
  virtual void ScrollbarActivityStopped() const override {}
  virtual bool IsScrollbarOnRight() const override {
    return (StyleVisibility()->mDirection == NS_STYLE_DIRECTION_LTR);
  }
  virtual bool ShouldSuppressScrollbarRepaints() const override {
    return false;
  }


  // nsIReflowCallback
  virtual bool ReflowFinished() override;
  virtual void ReflowCallbackCanceled() override;

  NS_IMETHOD DoXULLayout(nsBoxLayoutState& aBoxLayoutState) override;
  virtual void MarkIntrinsicISizesDirty() override;

  virtual nsSize GetXULMinSizeForScrollArea(nsBoxLayoutState& aBoxLayoutState) override;
  virtual nsSize GetXULPrefSize(nsBoxLayoutState& aBoxLayoutState) override;

  // size calculation 
  int32_t GetRowCount();
  int32_t GetRowHeightAppUnits() { return mRowHeight; }
  int32_t GetFixedRowSize();
  void SetRowHeight(nscoord aRowHeight);
  nscoord GetYPosition();
  nscoord GetAvailableHeight();
  nscoord ComputeIntrinsicISize(nsBoxLayoutState& aBoxLayoutState);

  // scrolling
  nsresult InternalPositionChangedCallback();
  nsresult InternalPositionChanged(bool aUp, int32_t aDelta);
  // Process pending position changed events, then do the position change.
  // This can wipe out the frametree.
  nsresult DoInternalPositionChangedSync(bool aUp, int32_t aDelta);
  // Actually do the internal position change.  This can wipe out the frametree
  nsresult DoInternalPositionChanged(bool aUp, int32_t aDelta);
  nsListScrollSmoother* GetSmoother();
  void VerticalScroll(int32_t aDelta);
  // Update the scroll index given a position, in CSS pixels
  void UpdateIndex(int32_t aNewPos);

  // frames
  nsIFrame* GetFirstFrame();
  nsIFrame* GetLastFrame();

  // lazy row creation and destruction
  void CreateRows();
  void DestroyRows(int32_t& aRowsToLose);
  void ReverseDestroyRows(int32_t& aRowsToLose);
  nsIFrame* GetFirstItemBox(int32_t aOffset, bool* aCreated);
  nsIFrame* GetNextItemBox(nsIFrame* aBox, int32_t aOffset, bool* aCreated);
  bool ContinueReflow(nscoord height);
  NS_IMETHOD ListBoxAppendFrames(nsFrameList& aFrameList);
  NS_IMETHOD ListBoxInsertFrames(nsIFrame* aPrevFrame, nsFrameList& aFrameList);
  void OnContentInserted(nsIContent* aContent);
  void OnContentRemoved(nsPresContext* aPresContext,  nsIContent* aContainer,
                        nsIFrame* aChildFrame, nsIContent* aOldNextSibling);

  void GetListItemContentAt(int32_t aIndex, nsIContent** aContent);
  void GetListItemNextSibling(nsIContent* aListItem, nsIContent** aContent, int32_t& aSiblingIndex);

  void PostReflowCallback();

  bool SetBoxObject(nsPIBoxObject* aBoxObject)
  {
    NS_ENSURE_TRUE(!mBoxObject, false);
    mBoxObject = aBoxObject;
    return true;
  }

  virtual bool SupportsOrdinalsInChildren() override;

  virtual bool ComputesOwnOverflowArea() override { return true; }

protected:
  class nsPositionChangedEvent;
  friend class nsPositionChangedEvent;

  class nsPositionChangedEvent : public mozilla::Runnable
  {
  public:
    nsPositionChangedEvent(nsListBoxBodyFrame* aFrame,
                           bool aUp, int32_t aDelta) :
      mFrame(aFrame), mUp(aUp), mDelta(aDelta)
    {}
  
    NS_IMETHOD Run() override
    {
      if (!mFrame) {
        return NS_OK;
      }

      mFrame->mPendingPositionChangeEvents.RemoveElement(this);

      return mFrame->DoInternalPositionChanged(mUp, mDelta);
    }

    void Revoke() {
      mFrame = nullptr;
    }

    nsListBoxBodyFrame* mFrame;
    bool mUp;
    int32_t mDelta;
  };

  void ComputeTotalRowCount();
  int32_t ToRowIndex(nscoord aPos) const;
  void RemoveChildFrame(nsBoxLayoutState &aState, nsIFrame *aChild);

  nsTArray< RefPtr<nsPositionChangedEvent> > mPendingPositionChangeEvents;
  nsCOMPtr<nsPIBoxObject> mBoxObject;

  // frame markers
  nsWeakFrame mTopFrame;
  nsIFrame* mBottomFrame;
  nsIFrame* mLinkupFrame;

  nsListScrollSmoother* mScrollSmoother;

  int32_t mRowsToPrepend;

  // row height
  int32_t mRowCount;
  nscoord mRowHeight;
  nscoord mAvailableHeight;
  nscoord mStringWidth;

  // scrolling
  int32_t mCurrentIndex; // Row-based
  int32_t mOldIndex; 
  int32_t mYPosition;
  int32_t mTimePerRow;

  // row height
  bool mRowHeightWasSet;
  // scrolling
  bool mScrolling;
  bool mAdjustScroll;

  bool mReflowCallbackPosted;
};

#endif // nsListBoxBodyFrame_h