зеркало из https://github.com/mozilla/gecko-dev.git
300 строки
8.9 KiB
C++
300 строки
8.9 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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/*
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* base class for rendering objects that can be split across lines,
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* columns, or pages
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*/
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#include "nsSplittableFrame.h"
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#include "nsIContent.h"
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#include "nsPresContext.h"
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#include "nsStyleContext.h"
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#include "nsContainerFrame.h"
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NS_IMPL_FRAMEARENA_HELPERS(nsSplittableFrame)
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void
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nsSplittableFrame::Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* aPrevInFlow)
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{
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nsFrame::Init(aContent, aParent, aPrevInFlow);
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if (aPrevInFlow) {
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// Hook the frame into the flow
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SetPrevInFlow(aPrevInFlow);
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aPrevInFlow->SetNextInFlow(this);
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}
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}
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void
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nsSplittableFrame::DestroyFrom(nsIFrame* aDestructRoot)
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{
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// Disconnect from the flow list
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if (mPrevContinuation || mNextContinuation) {
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RemoveFromFlow(this);
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}
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// Let the base class destroy the frame
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nsFrame::DestroyFrom(aDestructRoot);
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}
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nsSplittableType
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nsSplittableFrame::GetSplittableType() const
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{
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return NS_FRAME_SPLITTABLE;
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}
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nsIFrame* nsSplittableFrame::GetPrevContinuation() const
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{
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return mPrevContinuation;
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}
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NS_METHOD nsSplittableFrame::SetPrevContinuation(nsIFrame* aFrame)
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{
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NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(), "setting a prev continuation with incorrect type!");
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NS_ASSERTION (!IsInPrevContinuationChain(aFrame, this), "creating a loop in continuation chain!");
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mPrevContinuation = aFrame;
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RemoveStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
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return NS_OK;
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}
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nsIFrame* nsSplittableFrame::GetNextContinuation() const
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{
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return mNextContinuation;
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}
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NS_METHOD nsSplittableFrame::SetNextContinuation(nsIFrame* aFrame)
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{
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NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(), "setting a next continuation with incorrect type!");
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NS_ASSERTION (!IsInNextContinuationChain(aFrame, this), "creating a loop in continuation chain!");
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mNextContinuation = aFrame;
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if (aFrame)
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aFrame->RemoveStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
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return NS_OK;
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}
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nsIFrame* nsSplittableFrame::GetFirstContinuation() const
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{
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nsSplittableFrame* firstContinuation = const_cast<nsSplittableFrame*>(this);
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while (firstContinuation->mPrevContinuation) {
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firstContinuation = static_cast<nsSplittableFrame*>(firstContinuation->mPrevContinuation);
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}
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NS_POSTCONDITION(firstContinuation, "illegal state in continuation chain.");
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return firstContinuation;
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}
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nsIFrame* nsSplittableFrame::GetLastContinuation() const
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{
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nsSplittableFrame* lastContinuation = const_cast<nsSplittableFrame*>(this);
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while (lastContinuation->mNextContinuation) {
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lastContinuation = static_cast<nsSplittableFrame*>(lastContinuation->mNextContinuation);
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}
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NS_POSTCONDITION(lastContinuation, "illegal state in continuation chain.");
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return lastContinuation;
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}
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#ifdef DEBUG
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bool nsSplittableFrame::IsInPrevContinuationChain(nsIFrame* aFrame1, nsIFrame* aFrame2)
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{
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int32_t iterations = 0;
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while (aFrame1 && iterations < 10) {
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// Bail out after 10 iterations so we don't bog down debug builds too much
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if (aFrame1 == aFrame2)
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return true;
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aFrame1 = aFrame1->GetPrevContinuation();
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++iterations;
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}
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return false;
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}
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bool nsSplittableFrame::IsInNextContinuationChain(nsIFrame* aFrame1, nsIFrame* aFrame2)
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{
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int32_t iterations = 0;
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while (aFrame1 && iterations < 10) {
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// Bail out after 10 iterations so we don't bog down debug builds too much
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if (aFrame1 == aFrame2)
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return true;
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aFrame1 = aFrame1->GetNextContinuation();
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++iterations;
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}
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return false;
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}
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#endif
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nsIFrame* nsSplittableFrame::GetPrevInFlow() const
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{
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return (GetStateBits() & NS_FRAME_IS_FLUID_CONTINUATION) ? mPrevContinuation : nullptr;
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}
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NS_METHOD nsSplittableFrame::SetPrevInFlow(nsIFrame* aFrame)
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{
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NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(), "setting a prev in flow with incorrect type!");
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NS_ASSERTION (!IsInPrevContinuationChain(aFrame, this), "creating a loop in continuation chain!");
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mPrevContinuation = aFrame;
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AddStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
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return NS_OK;
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}
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nsIFrame* nsSplittableFrame::GetNextInFlow() const
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{
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return mNextContinuation && (mNextContinuation->GetStateBits() & NS_FRAME_IS_FLUID_CONTINUATION) ?
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mNextContinuation : nullptr;
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}
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NS_METHOD nsSplittableFrame::SetNextInFlow(nsIFrame* aFrame)
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{
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NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(), "setting a next in flow with incorrect type!");
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NS_ASSERTION (!IsInNextContinuationChain(aFrame, this), "creating a loop in continuation chain!");
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mNextContinuation = aFrame;
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if (aFrame)
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aFrame->AddStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
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return NS_OK;
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}
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nsIFrame* nsSplittableFrame::GetFirstInFlow() const
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{
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nsSplittableFrame* firstInFlow = const_cast<nsSplittableFrame*>(this);
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while (nsIFrame *prev = firstInFlow->GetPrevInFlow()) {
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firstInFlow = static_cast<nsSplittableFrame*>(prev);
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}
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NS_POSTCONDITION(firstInFlow, "illegal state in flow chain.");
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return firstInFlow;
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}
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nsIFrame* nsSplittableFrame::GetLastInFlow() const
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{
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nsSplittableFrame* lastInFlow = const_cast<nsSplittableFrame*>(this);
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while (nsIFrame* next = lastInFlow->GetNextInFlow()) {
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lastInFlow = static_cast<nsSplittableFrame*>(next);
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}
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NS_POSTCONDITION(lastInFlow, "illegal state in flow chain.");
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return lastInFlow;
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}
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// Remove this frame from the flow. Connects prev in flow and next in flow
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void
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nsSplittableFrame::RemoveFromFlow(nsIFrame* aFrame)
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{
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nsIFrame* prevContinuation = aFrame->GetPrevContinuation();
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nsIFrame* nextContinuation = aFrame->GetNextContinuation();
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// The new continuation is fluid only if the continuation on both sides
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// of the removed frame was fluid
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if (aFrame->GetPrevInFlow() && aFrame->GetNextInFlow()) {
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if (prevContinuation) {
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prevContinuation->SetNextInFlow(nextContinuation);
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}
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if (nextContinuation) {
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nextContinuation->SetPrevInFlow(prevContinuation);
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}
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} else {
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if (prevContinuation) {
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prevContinuation->SetNextContinuation(nextContinuation);
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}
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if (nextContinuation) {
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nextContinuation->SetPrevContinuation(prevContinuation);
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}
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}
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aFrame->SetPrevInFlow(nullptr);
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aFrame->SetNextInFlow(nullptr);
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}
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nscoord
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nsSplittableFrame::GetConsumedHeight() const
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{
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nscoord height = 0;
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// Reduce the height by the computed height of prev-in-flows.
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for (nsIFrame* prev = GetPrevInFlow(); prev; prev = prev->GetPrevInFlow()) {
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height += prev->GetRect().height;
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}
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return height;
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}
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nscoord
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nsSplittableFrame::GetEffectiveComputedHeight(const nsHTMLReflowState& aReflowState,
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nscoord aConsumedHeight) const
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{
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nscoord height = aReflowState.ComputedHeight();
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if (height == NS_INTRINSICSIZE) {
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return NS_INTRINSICSIZE;
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}
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if (aConsumedHeight == NS_INTRINSICSIZE) {
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aConsumedHeight = GetConsumedHeight();
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}
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height -= aConsumedHeight;
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if (aConsumedHeight != 0 && aConsumedHeight != NS_INTRINSICSIZE) {
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// We just subtracted our top-border padding, since it was included in the
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// first frame's height. Add it back to get the content height.
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height += aReflowState.mComputedBorderPadding.top;
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}
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// We may have stretched the frame beyond its computed height. Oh well.
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height = std::max(0, height);
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return height;
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}
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int
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nsSplittableFrame::GetSkipSides(const nsHTMLReflowState* aReflowState) const
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{
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if (IS_TRUE_OVERFLOW_CONTAINER(this)) {
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return (1 << NS_SIDE_TOP) | (1 << NS_SIDE_BOTTOM);
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}
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int skip = 0;
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if (GetPrevInFlow()) {
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skip |= 1 << NS_SIDE_TOP;
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}
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if (aReflowState) {
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// We're in the midst of reflow right now, so it's possible that we haven't
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// created a nif yet. If our content height is going to exceed our available
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// height, though, then we're going to need a next-in-flow, it just hasn't
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// been created yet.
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if (NS_UNCONSTRAINEDSIZE != aReflowState->availableHeight) {
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nscoord effectiveCH = this->GetEffectiveComputedHeight(*aReflowState);
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if (effectiveCH > aReflowState->availableHeight) {
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// Our content height is going to exceed our available height, so we're
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// going to need a next-in-flow.
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skip |= 1 << NS_SIDE_BOTTOM;
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}
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}
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} else {
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nsIFrame* nif = GetNextInFlow();
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if (nif && !IS_TRUE_OVERFLOW_CONTAINER(nif)) {
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skip |= 1 << NS_SIDE_BOTTOM;
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}
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}
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return skip;
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}
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#ifdef DEBUG
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void
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nsSplittableFrame::DumpBaseRegressionData(nsPresContext* aPresContext, FILE* out, int32_t aIndent)
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{
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nsFrame::DumpBaseRegressionData(aPresContext, out, aIndent);
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if (nullptr != mNextContinuation) {
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IndentBy(out, aIndent);
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fprintf(out, "<next-continuation va=\"%p\"/>\n", (void*)mNextContinuation);
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}
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if (nullptr != mPrevContinuation) {
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IndentBy(out, aIndent);
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fprintf(out, "<prev-continuation va=\"%p\"/>\n", (void*)mPrevContinuation);
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}
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}
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#endif
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