mirror of
https://github.com/mozilla/gecko-dev.git
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542 lines
14 KiB
C++
542 lines
14 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsCOMPtr.h"
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#include "nsGkAtoms.h"
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#include "nsFrameTraversal.h"
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#include "nsFrameList.h"
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#include "nsPlaceholderFrame.h"
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#include "nsContainerFrame.h"
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class nsFrameIterator : public nsIFrameEnumerator
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{
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public:
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typedef nsIFrame::ChildListID ChildListID;
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NS_DECL_ISUPPORTS
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virtual void First() override;
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virtual void Next() override;
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virtual nsIFrame* CurrentItem() override;
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virtual bool IsDone() override;
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virtual void Last() override;
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virtual void Prev() override;
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nsFrameIterator(nsPresContext* aPresContext, nsIFrame *aStart,
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nsIteratorType aType, bool aLockScroll, bool aFollowOOFs,
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bool aSkipPopupChecks);
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protected:
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virtual ~nsFrameIterator() {}
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void setCurrent(nsIFrame *aFrame){mCurrent = aFrame;}
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nsIFrame *getCurrent(){return mCurrent;}
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nsIFrame *getStart(){return mStart;}
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nsIFrame *getLast(){return mLast;}
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void setLast(nsIFrame *aFrame){mLast = aFrame;}
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int8_t getOffEdge(){return mOffEdge;}
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void setOffEdge(int8_t aOffEdge){mOffEdge = aOffEdge;}
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/*
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Our own versions of the standard frame tree navigation
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methods, which, if the iterator is following out-of-flows,
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apply the following rules for placeholder frames:
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- If a frame HAS a placeholder frame, getting its parent
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gets the placeholder's parent.
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- If a frame's first child or next/prev sibling IS a
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placeholder frame, then we instead return the real frame.
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- If a frame HAS a placeholder frame, getting its next/prev
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sibling gets the placeholder frame's next/prev sibling.
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These are all applied recursively to support multiple levels of
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placeholders.
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*/
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nsIFrame* GetParentFrame(nsIFrame* aFrame);
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// like GetParentFrame but returns null once a popup frame is reached
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nsIFrame* GetParentFrameNotPopup(nsIFrame* aFrame);
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nsIFrame* GetFirstChild(nsIFrame* aFrame);
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nsIFrame* GetLastChild(nsIFrame* aFrame);
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nsIFrame* GetNextSibling(nsIFrame* aFrame);
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nsIFrame* GetPrevSibling(nsIFrame* aFrame);
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/*
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These methods are overridden by the bidi visual iterator to have the
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semantics of "get first child in visual order", "get last child in visual
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order", "get next sibling in visual order" and "get previous sibling in visual
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order".
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*/
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virtual nsIFrame* GetFirstChildInner(nsIFrame* aFrame);
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virtual nsIFrame* GetLastChildInner(nsIFrame* aFrame);
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virtual nsIFrame* GetNextSiblingInner(nsIFrame* aFrame);
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virtual nsIFrame* GetPrevSiblingInner(nsIFrame* aFrame);
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nsIFrame* GetPlaceholderFrame(nsIFrame* aFrame);
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bool IsPopupFrame(nsIFrame* aFrame);
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nsPresContext* const mPresContext;
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const bool mLockScroll;
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const bool mFollowOOFs;
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const bool mSkipPopupChecks;
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const nsIteratorType mType;
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private:
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nsIFrame* const mStart;
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nsIFrame* mCurrent;
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nsIFrame* mLast; //the last one that was in current;
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int8_t mOffEdge; //0= no -1 to far prev, 1 to far next;
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};
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// Bidi visual iterator
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class nsVisualIterator: public nsFrameIterator
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{
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public:
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nsVisualIterator(nsPresContext* aPresContext, nsIFrame *aStart,
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nsIteratorType aType, bool aLockScroll,
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bool aFollowOOFs, bool aSkipPopupChecks) :
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nsFrameIterator(aPresContext, aStart, aType, aLockScroll, aFollowOOFs, aSkipPopupChecks) {}
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protected:
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nsIFrame* GetFirstChildInner(nsIFrame* aFrame) override;
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nsIFrame* GetLastChildInner(nsIFrame* aFrame) override;
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nsIFrame* GetNextSiblingInner(nsIFrame* aFrame) override;
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nsIFrame* GetPrevSiblingInner(nsIFrame* aFrame) override;
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};
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/************IMPLEMENTATIONS**************/
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nsresult
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NS_CreateFrameTraversal(nsIFrameTraversal** aResult)
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{
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NS_ENSURE_ARG_POINTER(aResult);
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nsCOMPtr<nsIFrameTraversal> t = new nsFrameTraversal();
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t.forget(aResult);
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return NS_OK;
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}
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nsresult
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NS_NewFrameTraversal(nsIFrameEnumerator **aEnumerator,
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nsPresContext* aPresContext,
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nsIFrame *aStart,
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nsIteratorType aType,
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bool aVisual,
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bool aLockInScrollView,
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bool aFollowOOFs,
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bool aSkipPopupChecks)
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{
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if (!aEnumerator || !aStart)
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return NS_ERROR_NULL_POINTER;
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if (aFollowOOFs) {
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aStart = nsPlaceholderFrame::GetRealFrameFor(aStart);
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}
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nsCOMPtr<nsIFrameEnumerator> trav;
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if (aVisual) {
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trav = new nsVisualIterator(aPresContext, aStart, aType,
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aLockInScrollView, aFollowOOFs, aSkipPopupChecks);
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} else {
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trav = new nsFrameIterator(aPresContext, aStart, aType,
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aLockInScrollView, aFollowOOFs, aSkipPopupChecks);
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}
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trav.forget(aEnumerator);
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return NS_OK;
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}
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nsFrameTraversal::nsFrameTraversal()
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{
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}
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nsFrameTraversal::~nsFrameTraversal()
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{
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}
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NS_IMPL_ISUPPORTS(nsFrameTraversal,nsIFrameTraversal)
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NS_IMETHODIMP
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nsFrameTraversal::NewFrameTraversal(nsIFrameEnumerator **aEnumerator,
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nsPresContext* aPresContext,
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nsIFrame *aStart,
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int32_t aType,
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bool aVisual,
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bool aLockInScrollView,
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bool aFollowOOFs,
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bool aSkipPopupChecks)
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{
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return NS_NewFrameTraversal(aEnumerator, aPresContext, aStart,
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static_cast<nsIteratorType>(aType),
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aVisual, aLockInScrollView, aFollowOOFs, aSkipPopupChecks);
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}
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// nsFrameIterator implementation
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NS_IMPL_ISUPPORTS(nsFrameIterator, nsIFrameEnumerator)
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nsFrameIterator::nsFrameIterator(nsPresContext* aPresContext, nsIFrame *aStart,
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nsIteratorType aType, bool aLockInScrollView,
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bool aFollowOOFs, bool aSkipPopupChecks)
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: mPresContext(aPresContext),
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mLockScroll(aLockInScrollView),
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mFollowOOFs(aFollowOOFs),
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mSkipPopupChecks(aSkipPopupChecks),
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mType(aType),
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mStart(aStart),
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mCurrent(aStart),
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mLast(aStart),
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mOffEdge(0)
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{
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MOZ_ASSERT(!aFollowOOFs || aStart->GetType() != nsGkAtoms::placeholderFrame,
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"Caller should have resolved placeholder frame");
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}
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nsIFrame*
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nsFrameIterator::CurrentItem()
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{
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if (mOffEdge)
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return nullptr;
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return mCurrent;
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}
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bool
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nsFrameIterator::IsDone()
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{
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return mOffEdge != 0;
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}
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void
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nsFrameIterator::First()
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{
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mCurrent = mStart;
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}
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static bool
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IsRootFrame(nsIFrame* aFrame)
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{
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nsIAtom* atom = aFrame->GetType();
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return (atom == nsGkAtoms::canvasFrame) ||
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(atom == nsGkAtoms::rootFrame);
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}
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void
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nsFrameIterator::Last()
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{
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nsIFrame* result;
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nsIFrame* parent = getCurrent();
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// If the current frame is a popup, don't move farther up the tree.
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// Otherwise, get the nearest root frame or popup.
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if (mSkipPopupChecks || parent->GetType() != nsGkAtoms::menuPopupFrame) {
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while (!IsRootFrame(parent) && (result = GetParentFrameNotPopup(parent)))
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parent = result;
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}
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while ((result = GetLastChild(parent))) {
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parent = result;
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}
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setCurrent(parent);
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if (!parent)
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setOffEdge(1);
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}
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void
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nsFrameIterator::Next()
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{
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// recursive-oid method to get next frame
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nsIFrame *result = nullptr;
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nsIFrame *parent = getCurrent();
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if (!parent)
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parent = getLast();
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if (mType == eLeaf) {
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// Drill down to first leaf
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while ((result = GetFirstChild(parent))) {
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parent = result;
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}
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} else if (mType == ePreOrder) {
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result = GetFirstChild(parent);
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if (result)
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parent = result;
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}
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if (parent != getCurrent()) {
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result = parent;
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} else {
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while (parent) {
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result = GetNextSibling(parent);
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if (result) {
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if (mType != ePreOrder) {
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parent = result;
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while ((result = GetFirstChild(parent))) {
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parent = result;
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}
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result = parent;
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}
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break;
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}
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else {
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result = GetParentFrameNotPopup(parent);
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if (!result || IsRootFrame(result) ||
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(mLockScroll && result->GetType() == nsGkAtoms::scrollFrame)) {
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result = nullptr;
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break;
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}
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if (mType == ePostOrder)
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break;
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parent = result;
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}
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}
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}
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setCurrent(result);
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if (!result) {
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setOffEdge(1);
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setLast(parent);
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}
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}
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void
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nsFrameIterator::Prev()
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{
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// recursive-oid method to get prev frame
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nsIFrame *result = nullptr;
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nsIFrame *parent = getCurrent();
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if (!parent)
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parent = getLast();
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if (mType == eLeaf) {
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// Drill down to last leaf
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while ((result = GetLastChild(parent))) {
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parent = result;
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}
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} else if (mType == ePostOrder) {
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result = GetLastChild(parent);
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if (result)
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parent = result;
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}
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if (parent != getCurrent()) {
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result = parent;
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} else {
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while (parent) {
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result = GetPrevSibling(parent);
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if (result) {
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if (mType != ePostOrder) {
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parent = result;
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while ((result = GetLastChild(parent))) {
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parent = result;
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}
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result = parent;
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}
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break;
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} else {
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result = GetParentFrameNotPopup(parent);
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if (!result || IsRootFrame(result) ||
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(mLockScroll && result->GetType() == nsGkAtoms::scrollFrame)) {
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result = nullptr;
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break;
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}
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if (mType == ePreOrder)
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break;
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parent = result;
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}
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}
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}
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setCurrent(result);
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if (!result) {
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setOffEdge(-1);
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setLast(parent);
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}
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}
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nsIFrame*
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nsFrameIterator::GetParentFrame(nsIFrame* aFrame)
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{
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if (mFollowOOFs)
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aFrame = GetPlaceholderFrame(aFrame);
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if (aFrame)
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return aFrame->GetParent();
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return nullptr;
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}
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nsIFrame*
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nsFrameIterator::GetParentFrameNotPopup(nsIFrame* aFrame)
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{
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if (mFollowOOFs)
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aFrame = GetPlaceholderFrame(aFrame);
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if (aFrame) {
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nsIFrame* parent = aFrame->GetParent();
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if (!IsPopupFrame(parent))
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return parent;
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}
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return nullptr;
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}
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nsIFrame*
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nsFrameIterator::GetFirstChild(nsIFrame* aFrame)
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{
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nsIFrame* result = GetFirstChildInner(aFrame);
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if (mLockScroll && result && result->GetType() == nsGkAtoms::scrollFrame)
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return nullptr;
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if (result && mFollowOOFs) {
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result = nsPlaceholderFrame::GetRealFrameFor(result);
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if (IsPopupFrame(result))
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result = GetNextSibling(result);
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}
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return result;
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}
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nsIFrame*
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nsFrameIterator::GetLastChild(nsIFrame* aFrame)
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{
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nsIFrame* result = GetLastChildInner(aFrame);
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if (mLockScroll && result && result->GetType() == nsGkAtoms::scrollFrame)
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return nullptr;
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if (result && mFollowOOFs) {
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result = nsPlaceholderFrame::GetRealFrameFor(result);
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if (IsPopupFrame(result))
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result = GetPrevSibling(result);
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}
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return result;
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}
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nsIFrame*
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nsFrameIterator::GetNextSibling(nsIFrame* aFrame)
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{
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nsIFrame* result = nullptr;
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if (mFollowOOFs)
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aFrame = GetPlaceholderFrame(aFrame);
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if (aFrame) {
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result = GetNextSiblingInner(aFrame);
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if (result && mFollowOOFs)
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result = nsPlaceholderFrame::GetRealFrameFor(result);
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}
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if (mFollowOOFs && IsPopupFrame(result))
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result = GetNextSibling(result);
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return result;
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}
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nsIFrame*
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nsFrameIterator::GetPrevSibling(nsIFrame* aFrame)
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{
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nsIFrame* result = nullptr;
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if (mFollowOOFs)
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aFrame = GetPlaceholderFrame(aFrame);
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if (aFrame) {
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result = GetPrevSiblingInner(aFrame);
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if (result && mFollowOOFs)
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result = nsPlaceholderFrame::GetRealFrameFor(result);
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}
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if (mFollowOOFs && IsPopupFrame(result))
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result = GetPrevSibling(result);
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return result;
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}
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nsIFrame*
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nsFrameIterator::GetFirstChildInner(nsIFrame* aFrame) {
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return aFrame->PrincipalChildList().FirstChild();
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}
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nsIFrame*
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nsFrameIterator::GetLastChildInner(nsIFrame* aFrame) {
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return aFrame->PrincipalChildList().LastChild();
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}
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nsIFrame*
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nsFrameIterator::GetNextSiblingInner(nsIFrame* aFrame) {
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return aFrame->GetNextSibling();
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}
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nsIFrame*
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nsFrameIterator::GetPrevSiblingInner(nsIFrame* aFrame) {
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return aFrame->GetPrevSibling();
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}
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nsIFrame*
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nsFrameIterator::GetPlaceholderFrame(nsIFrame* aFrame)
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{
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nsIFrame* result = aFrame;
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nsIPresShell *presShell = mPresContext->GetPresShell();
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if (presShell) {
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nsIFrame* placeholder = presShell->GetPlaceholderFrameFor(aFrame);
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if (placeholder)
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result = placeholder;
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}
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if (result != aFrame)
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result = GetPlaceholderFrame(result);
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return result;
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}
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bool
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nsFrameIterator::IsPopupFrame(nsIFrame* aFrame)
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{
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// If skipping popup checks, pretend this isn't one.
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if (mSkipPopupChecks) {
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return false;
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}
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return (aFrame &&
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aFrame->StyleDisplay()->mDisplay == StyleDisplay::MozPopup);
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}
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// nsVisualIterator implementation
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nsIFrame*
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nsVisualIterator::GetFirstChildInner(nsIFrame* aFrame) {
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return aFrame->PrincipalChildList().GetNextVisualFor(nullptr);
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}
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nsIFrame*
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nsVisualIterator::GetLastChildInner(nsIFrame* aFrame) {
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return aFrame->PrincipalChildList().GetPrevVisualFor(nullptr);
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}
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nsIFrame*
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nsVisualIterator::GetNextSiblingInner(nsIFrame* aFrame) {
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nsIFrame* parent = GetParentFrame(aFrame);
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if (!parent)
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return nullptr;
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return parent->PrincipalChildList().GetNextVisualFor(aFrame);
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}
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nsIFrame*
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nsVisualIterator::GetPrevSiblingInner(nsIFrame* aFrame) {
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nsIFrame* parent = GetParentFrame(aFrame);
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if (!parent)
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return nullptr;
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return parent->PrincipalChildList().GetPrevVisualFor(aFrame);
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}
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