gecko-dev/layout/svg/nsSVGSwitchFrame.cpp

258 строки
7.4 KiB
C++

/* -*- 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/. */
// Keep in (case-insensitive) order:
#include "gfxMatrix.h"
#include "gfxRect.h"
#include "nsSVGEffects.h"
#include "nsSVGGFrame.h"
#include "mozilla/dom/SVGSwitchElement.h"
#include "nsSVGUtils.h"
class nsRenderingContext;
typedef nsSVGGFrame nsSVGSwitchFrameBase;
class nsSVGSwitchFrame : public nsSVGSwitchFrameBase
{
friend nsIFrame*
NS_NewSVGSwitchFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
protected:
nsSVGSwitchFrame(nsStyleContext* aContext) :
nsSVGSwitchFrameBase(aContext) {}
public:
NS_DECL_FRAMEARENA_HELPERS
#ifdef DEBUG
NS_IMETHOD Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow);
#endif
/**
* Get the "type" of the frame
*
* @see nsGkAtoms::svgSwitchFrame
*/
virtual nsIAtom* GetType() const;
#ifdef DEBUG
NS_IMETHOD GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("SVGSwitch"), aResult);
}
#endif
NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists);
// nsISVGChildFrame interface:
NS_IMETHOD PaintSVG(nsRenderingContext* aContext, const nsIntRect *aDirtyRect);
NS_IMETHODIMP_(nsIFrame*) GetFrameForPoint(const nsPoint &aPoint);
NS_IMETHODIMP_(nsRect) GetCoveredRegion();
virtual void ReflowSVG();
virtual SVGBBox GetBBoxContribution(const gfxMatrix &aToBBoxUserspace,
uint32_t aFlags);
private:
nsIFrame *GetActiveChildFrame();
};
//----------------------------------------------------------------------
// Implementation
nsIFrame*
NS_NewSVGSwitchFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsSVGSwitchFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsSVGSwitchFrame)
#ifdef DEBUG
NS_IMETHODIMP
nsSVGSwitchFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
NS_ASSERTION(aContent->IsSVG(nsGkAtoms::svgSwitch),
"Content is not an SVG switch\n");
return nsSVGSwitchFrameBase::Init(aContent, aParent, aPrevInFlow);
}
#endif /* DEBUG */
nsIAtom *
nsSVGSwitchFrame::GetType() const
{
return nsGkAtoms::svgSwitchFrame;
}
NS_IMETHODIMP
nsSVGSwitchFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
nsIFrame* kid = GetActiveChildFrame();
if (kid) {
return BuildDisplayListForChild(aBuilder, kid, aDirtyRect, aLists);
}
return NS_OK;
}
NS_IMETHODIMP
nsSVGSwitchFrame::PaintSVG(nsRenderingContext* aContext,
const nsIntRect *aDirtyRect)
{
NS_ASSERTION(!NS_SVGDisplayListPaintingEnabled() ||
(mState & NS_STATE_SVG_NONDISPLAY_CHILD),
"If display lists are enabled, only painting of non-display "
"SVG should take this code path");
const nsStyleDisplay *display = mStyleContext->GetStyleDisplay();
if (display->mOpacity == 0.0)
return NS_OK;
nsIFrame *kid = GetActiveChildFrame();
if (kid) {
nsSVGUtils::PaintFrameWithEffects(aContext, aDirtyRect, kid);
}
return NS_OK;
}
NS_IMETHODIMP_(nsIFrame*)
nsSVGSwitchFrame::GetFrameForPoint(const nsPoint &aPoint)
{
NS_ASSERTION(!NS_SVGDisplayListHitTestingEnabled() ||
(mState & NS_STATE_SVG_NONDISPLAY_CHILD),
"If display lists are enabled, only hit-testing of non-display "
"SVG should take this code path");
nsIFrame *kid = GetActiveChildFrame();
if (kid) {
nsISVGChildFrame* svgFrame = do_QueryFrame(kid);
if (svgFrame) {
return svgFrame->GetFrameForPoint(aPoint);
}
}
return nullptr;
}
NS_IMETHODIMP_(nsRect)
nsSVGSwitchFrame::GetCoveredRegion()
{
nsRect rect;
nsIFrame *kid = GetActiveChildFrame();
if (kid) {
nsISVGChildFrame* child = do_QueryFrame(kid);
if (child) {
rect = child->GetCoveredRegion();
}
}
return rect;
}
void
nsSVGSwitchFrame::ReflowSVG()
{
NS_ASSERTION(nsSVGUtils::OuterSVGIsCallingReflowSVG(this),
"This call is probably a wasteful mistake");
NS_ABORT_IF_FALSE(!(GetStateBits() & NS_STATE_SVG_NONDISPLAY_CHILD),
"ReflowSVG mechanism not designed for this");
if (!nsSVGUtils::NeedsReflowSVG(this)) {
return;
}
// If the NS_FRAME_FIRST_REFLOW bit has been removed from our parent frame,
// then our outer-<svg> has previously had its initial reflow. In that case
// we need to make sure that that bit has been removed from ourself _before_
// recursing over our children to ensure that they know too. Otherwise, we
// need to remove it _after_ recursing over our children so that they know
// the initial reflow is currently underway.
bool outerSVGHasHadFirstReflow =
(GetParent()->GetStateBits() & NS_FRAME_FIRST_REFLOW) == 0;
if (outerSVGHasHadFirstReflow) {
mState &= ~NS_FRAME_FIRST_REFLOW; // tell our children
}
nsOverflowAreas overflowRects;
nsIFrame *child = GetActiveChildFrame();
if (child) {
nsISVGChildFrame* svgChild = do_QueryFrame(child);
if (svgChild) {
NS_ABORT_IF_FALSE(!(child->GetStateBits() & NS_STATE_SVG_NONDISPLAY_CHILD),
"Check for this explicitly in the |if|, then");
svgChild->ReflowSVG();
// We build up our child frame overflows here instead of using
// nsLayoutUtils::UnionChildOverflow since SVG frame's all use the same
// frame list, and we're iterating over that list now anyway.
ConsiderChildOverflow(overflowRects, child);
}
}
if (mState & NS_FRAME_FIRST_REFLOW) {
// Make sure we have our filter property (if any) before calling
// FinishAndStoreOverflow (subsequent filter changes are handled off
// nsChangeHint_UpdateEffects):
nsSVGEffects::UpdateEffects(this);
}
FinishAndStoreOverflow(overflowRects, mRect.Size());
// Remove state bits after FinishAndStoreOverflow so that it doesn't
// invalidate on first reflow:
mState &= ~(NS_FRAME_FIRST_REFLOW | NS_FRAME_IS_DIRTY |
NS_FRAME_HAS_DIRTY_CHILDREN);
}
SVGBBox
nsSVGSwitchFrame::GetBBoxContribution(const gfxMatrix &aToBBoxUserspace,
uint32_t aFlags)
{
nsIFrame* kid = GetActiveChildFrame();
if (kid) {
nsISVGChildFrame* svgKid = do_QueryFrame(kid);
if (svgKid) {
nsIContent *content = kid->GetContent();
gfxMatrix transform = aToBBoxUserspace;
if (content->IsSVG()) {
transform = static_cast<nsSVGElement*>(content)->
PrependLocalTransformsTo(aToBBoxUserspace);
}
return svgKid->GetBBoxContribution(transform, aFlags);
}
}
return SVGBBox();
}
nsIFrame *
nsSVGSwitchFrame::GetActiveChildFrame()
{
nsIContent *activeChild =
static_cast<mozilla::dom::SVGSwitchElement*>(mContent)->GetActiveChild();
if (activeChild) {
for (nsIFrame* kid = mFrames.FirstChild(); kid;
kid = kid->GetNextSibling()) {
if (activeChild == kid->GetContent()) {
return kid;
}
}
}
return nullptr;
}