/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=2 sw=2 et tw=78: */ /* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is mozilla.org code. * * The Initial Developer of the Original Code is * Netscape Communications Corporation. * Portions created by the Initial Developer are Copyright (C) 1998 * the Initial Developer. All Rights Reserved. * * Contributor(s): * L. David Baron , Mozilla Corporation * * Alternatively, the contents of this file may be used under the terms of * either of the GNU General Public License Version 2 or later (the "GPL"), * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ #include "nsLayoutUtils.h" #include "nsIFrame.h" #include "nsIFontMetrics.h" #include "nsIFormControlFrame.h" #include "nsPresContext.h" #include "nsIContent.h" #include "nsFrameList.h" #include "nsLayoutAtoms.h" #include "nsIAtom.h" #include "nsCSSPseudoElements.h" #include "nsIView.h" #include "nsIScrollableView.h" #include "nsPlaceholderFrame.h" #include "nsIScrollableFrame.h" #include "nsCSSFrameConstructor.h" #include "nsIPrivateDOMEvent.h" #include "nsIDOMEvent.h" #include "nsGUIEvent.h" #include "nsDisplayList.h" #include "nsRegion.h" #include "nsFrameManager.h" #include "nsBlockFrame.h" #ifdef MOZ_SVG_FOREIGNOBJECT #include "nsSVGForeignObjectFrame.h" #include "nsSVGUtils.h" #include "nsSVGOuterSVGFrame.h" #endif /** * A namespace class for static layout utilities. */ /** * GetFirstChildFrame returns the first "real" child frame of a * given frame. It will descend down into pseudo-frames (unless the * pseudo-frame is the :before generated frame). * @param aFrame the frame * @param aFrame the frame's content node */ static nsIFrame* GetFirstChildFrame(nsIFrame* aFrame, nsIContent* aContent) { NS_PRECONDITION(aFrame, "NULL frame pointer"); // Get the first child frame nsIFrame* childFrame = aFrame->GetFirstChild(nsnull); // If the child frame is a pseudo-frame, then return its first child. // Note that the frame we create for the generated content is also a // pseudo-frame and so don't drill down in that case if (childFrame && childFrame->IsPseudoFrame(aContent) && !childFrame->IsGeneratedContentFrame()) { return GetFirstChildFrame(childFrame, aContent); } return childFrame; } /** * GetLastChildFrame returns the last "real" child frame of a * given frame. It will descend down into pseudo-frames (unless the * pseudo-frame is the :after generated frame). * @param aFrame the frame * @param aFrame the frame's content node */ static nsIFrame* GetLastChildFrame(nsIFrame* aFrame, nsIContent* aContent) { NS_PRECONDITION(aFrame, "NULL frame pointer"); // Get the last continuation frame nsIFrame* lastContinuation = aFrame->GetLastContinuation(); // Get the last child frame nsIFrame* firstChildFrame = lastContinuation->GetFirstChild(nsnull); if (firstChildFrame) { nsFrameList frameList(firstChildFrame); nsIFrame* lastChildFrame = frameList.LastChild(); NS_ASSERTION(lastChildFrame, "unexpected error"); // Get the frame's first continuation. This matters in case the frame has // been continued across multiple lines or split by BiDi resolution. lastChildFrame = lastChildFrame->GetFirstContinuation(); // If the last child frame is a pseudo-frame, then return its last child. // Note that the frame we create for the generated content is also a // pseudo-frame and so don't drill down in that case if (lastChildFrame && lastChildFrame->IsPseudoFrame(aContent) && !lastChildFrame->IsGeneratedContentFrame()) { return GetLastChildFrame(lastChildFrame, aContent); } return lastChildFrame; } return nsnull; } // static nsIFrame* nsLayoutUtils::GetBeforeFrame(nsIFrame* aFrame) { NS_PRECONDITION(aFrame, "NULL frame pointer"); NS_ASSERTION(!aFrame->GetPrevContinuation(), "aFrame must be first continuation"); nsIFrame* firstFrame = GetFirstChildFrame(aFrame, aFrame->GetContent()); if (firstFrame && IsGeneratedContentFor(nsnull, firstFrame, nsCSSPseudoElements::before)) { return firstFrame; } return nsnull; } // static nsIFrame* nsLayoutUtils::GetAfterFrame(nsIFrame* aFrame) { NS_PRECONDITION(aFrame, "NULL frame pointer"); nsIFrame* lastFrame = GetLastChildFrame(aFrame, aFrame->GetContent()); if (lastFrame && IsGeneratedContentFor(nsnull, lastFrame, nsCSSPseudoElements::after)) { return lastFrame; } return nsnull; } // static nsIFrame* nsLayoutUtils::GetPageFrame(nsIFrame* aFrame) { for (nsIFrame* frame = aFrame; frame; frame = frame->GetParent()) { if (frame->GetType() == nsGkAtoms::pageFrame) { return frame; } } return nsnull; } nsIFrame* nsLayoutUtils::GetFloatFromPlaceholder(nsIFrame* aFrame) { if (nsGkAtoms::placeholderFrame != aFrame->GetType()) { return nsnull; } nsIFrame *outOfFlowFrame = nsPlaceholderFrame::GetRealFrameForPlaceholder(aFrame); if (outOfFlowFrame->GetStyleDisplay()->IsFloating()) { return outOfFlowFrame; } return nsnull; } // static PRBool nsLayoutUtils::IsGeneratedContentFor(nsIContent* aContent, nsIFrame* aFrame, nsIAtom* aPseudoElement) { NS_PRECONDITION(aFrame, "Must have a frame"); NS_PRECONDITION(aPseudoElement, "Must have a pseudo name"); if (!aFrame->IsGeneratedContentFrame()) { return PR_FALSE; } if (aContent && aFrame->GetContent() != aContent) { return PR_FALSE; } return aFrame->GetStyleContext()->GetPseudoType() == aPseudoElement; } // static nsIFrame* nsLayoutUtils::GetCrossDocParentFrame(nsIFrame* aFrame) { nsIFrame* p = aFrame->GetParent(); if (p) return p; nsIView* v = aFrame->GetView(); if (!v) return nsnull; v = v->GetParent(); // anonymous inner view if (!v) return nsnull; v = v->GetParent(); // subdocumentframe's view if (!v) return nsnull; return NS_STATIC_CAST(nsIFrame*, v->GetClientData()); } // static PRBool nsLayoutUtils::IsProperAncestorFrameCrossDoc(nsIFrame* aAncestorFrame, nsIFrame* aFrame, nsIFrame* aCommonAncestor) { if (aFrame == aCommonAncestor) return PR_FALSE; nsIFrame* parentFrame = GetCrossDocParentFrame(aFrame); while (parentFrame != aCommonAncestor) { if (parentFrame == aAncestorFrame) return PR_TRUE; parentFrame = GetCrossDocParentFrame(parentFrame); } return PR_FALSE; } // static PRBool nsLayoutUtils::IsProperAncestorFrame(nsIFrame* aAncestorFrame, nsIFrame* aFrame, nsIFrame* aCommonAncestor) { if (aFrame == aCommonAncestor) { return PR_FALSE; } nsIFrame* parentFrame = aFrame->GetParent(); while (parentFrame != aCommonAncestor) { if (parentFrame == aAncestorFrame) { return PR_TRUE; } parentFrame = parentFrame->GetParent(); } return PR_FALSE; } // static PRInt32 nsLayoutUtils::DoCompareTreePosition(nsIContent* aContent1, nsIContent* aContent2, PRInt32 aIf1Ancestor, PRInt32 aIf2Ancestor, nsIContent* aCommonAncestor) { NS_PRECONDITION(aContent1, "aContent1 must not be null"); NS_PRECONDITION(aContent2, "aContent2 must not be null"); nsAutoVoidArray content1Ancestors; nsINode* c1; for (c1 = aContent1; c1 && c1 != aCommonAncestor; c1 = c1->GetNodeParent()) { content1Ancestors.AppendElement(c1); } if (!c1 && aCommonAncestor) { // So, it turns out aCommonAncestor was not an ancestor of c1. Oops. // Never mind. We can continue as if aCommonAncestor was null. aCommonAncestor = nsnull; } nsAutoVoidArray content2Ancestors; nsINode* c2; for (c2 = aContent2; c2 && c2 != aCommonAncestor; c2 = c2->GetNodeParent()) { content2Ancestors.AppendElement(c2); } if (!c2 && aCommonAncestor) { // So, it turns out aCommonAncestor was not an ancestor of c2. // We need to retry with no common ancestor hint. return DoCompareTreePosition(aContent1, aContent2, aIf1Ancestor, aIf2Ancestor, nsnull); } int last1 = content1Ancestors.Count() - 1; int last2 = content2Ancestors.Count() - 1; nsINode* content1Ancestor = nsnull; nsINode* content2Ancestor = nsnull; while (last1 >= 0 && last2 >= 0 && ((content1Ancestor = NS_STATIC_CAST(nsINode*, content1Ancestors.ElementAt(last1))) == (content2Ancestor = NS_STATIC_CAST(nsINode*, content2Ancestors.ElementAt(last2))))) { last1--; last2--; } if (last1 < 0) { if (last2 < 0) { NS_ASSERTION(aContent1 == aContent2, "internal error?"); return 0; } // aContent1 is an ancestor of aContent2 return aIf1Ancestor; } if (last2 < 0) { // aContent2 is an ancestor of aContent1 return aIf2Ancestor; } // content1Ancestor != content2Ancestor, so they must be siblings with the same parent nsINode* parent = content1Ancestor->GetNodeParent(); NS_ASSERTION(parent, "no common ancestor at all???"); if (!parent) { // different documents?? return 0; } PRInt32 index1 = parent->IndexOf(content1Ancestor); PRInt32 index2 = parent->IndexOf(content2Ancestor); if (index1 < 0 || index2 < 0) { // one of them must be anonymous; we can't determine the order return 0; } return index1 - index2; } static nsIFrame* FillAncestors(nsIFrame* aFrame, nsIFrame* aStopAtAncestor, nsFrameManager* aFrameManager, nsTArray* aAncestors) { while (aFrame && aFrame != aStopAtAncestor) { aAncestors->AppendElement(aFrame); aFrame = nsLayoutUtils::GetParentOrPlaceholderFor(aFrameManager, aFrame); } return aFrame; } // Return true if aFrame1 is after aFrame2 static PRBool IsFrameAfter(nsIFrame* aFrame1, nsIFrame* aFrame2) { nsIFrame* f = aFrame2; do { f = f->GetNextSibling(); if (f == aFrame1) return PR_TRUE; } while (f); return PR_FALSE; } // static PRInt32 nsLayoutUtils::DoCompareTreePosition(nsIFrame* aFrame1, nsIFrame* aFrame2, PRInt32 aIf1Ancestor, PRInt32 aIf2Ancestor, nsIFrame* aCommonAncestor) { NS_PRECONDITION(aFrame1, "aFrame1 must not be null"); NS_PRECONDITION(aFrame2, "aFrame2 must not be null"); nsPresContext* presContext = aFrame1->GetPresContext(); if (presContext != aFrame2->GetPresContext()) { NS_ERROR("no common ancestor at all, different documents"); return 0; } nsFrameManager* frameManager = presContext->PresShell()->FrameManager(); nsAutoTArray frame1Ancestors; if (!FillAncestors(aFrame1, aCommonAncestor, frameManager, &frame1Ancestors)) { // We reached the root of the frame tree ... if aCommonAncestor was set, // it is wrong aCommonAncestor = nsnull; } nsAutoTArray frame2Ancestors; if (!FillAncestors(aFrame2, aCommonAncestor, frameManager, &frame2Ancestors) && aCommonAncestor) { // We reached the root of the frame tree ... aCommonAncestor was wrong. // Try again with no hint. return DoCompareTreePosition(aFrame1, aFrame2, aIf1Ancestor, aIf2Ancestor, nsnull); } PRInt32 last1 = PRInt32(frame1Ancestors.Length()) - 1; PRInt32 last2 = PRInt32(frame2Ancestors.Length()) - 1; while (last1 >= 0 && last2 >= 0 && frame1Ancestors[last1] == frame2Ancestors[last2]) { last1--; last2--; } if (last1 < 0) { if (last2 < 0) { NS_ASSERTION(aFrame1 == aFrame2, "internal error?"); return 0; } // aFrame1 is an ancestor of aFrame2 return aIf1Ancestor; } if (last2 < 0) { // aFrame2 is an ancestor of aFrame1 return aIf2Ancestor; } nsIFrame* ancestor1 = frame1Ancestors[last1]; nsIFrame* ancestor2 = frame2Ancestors[last2]; // Now we should be able to walk sibling chains to find which one is first if (IsFrameAfter(ancestor2, ancestor1)) return -1; if (IsFrameAfter(ancestor1, ancestor2)) return 1; NS_WARNING("Frames were in different child lists???"); return 0; } // static nsIFrame* nsLayoutUtils::GetLastSibling(nsIFrame* aFrame) { if (!aFrame) { return nsnull; } nsIFrame* next; while ((next = aFrame->GetNextSibling()) != nsnull) { aFrame = next; } return aFrame; } // static nsIView* nsLayoutUtils::FindSiblingViewFor(nsIView* aParentView, nsIFrame* aFrame) { nsIFrame* parentViewFrame = NS_STATIC_CAST(nsIFrame*, aParentView->GetClientData()); nsIContent* parentViewContent = parentViewFrame ? parentViewFrame->GetContent() : nsnull; for (nsIView* insertBefore = aParentView->GetFirstChild(); insertBefore; insertBefore = insertBefore->GetNextSibling()) { nsIFrame* f = NS_STATIC_CAST(nsIFrame*, insertBefore->GetClientData()); if (!f) { // this view could be some anonymous view attached to a meaningful parent for (nsIView* searchView = insertBefore->GetParent(); searchView; searchView = searchView->GetParent()) { f = NS_STATIC_CAST(nsIFrame*, searchView->GetClientData()); if (f) { break; } } NS_ASSERTION(f, "Can't find a frame anywhere!"); } if (!f || !aFrame->GetContent() || !f->GetContent() || CompareTreePosition(aFrame->GetContent(), f->GetContent(), parentViewContent) > 0) { // aFrame's content is after f's content (or we just don't know), // so put our view before f's view return insertBefore; } } return nsnull; } //static nsIScrollableFrame* nsLayoutUtils::GetScrollableFrameFor(nsIFrame *aScrolledFrame) { nsIFrame *frame = aScrolledFrame->GetParent(); if (!frame) { return nsnull; } nsIScrollableFrame *sf; CallQueryInterface(frame, &sf); return sf; } //static nsIScrollableFrame* nsLayoutUtils::GetScrollableFrameFor(nsIScrollableView *aScrollableView) { nsIFrame *frame = GetFrameFor(aScrollableView->View()->GetParent()); if (frame) { nsIScrollableFrame *sf; CallQueryInterface(frame, &sf); return sf; } return nsnull; } //static nsPresContext::ScrollbarStyles nsLayoutUtils::ScrollbarStylesOfView(nsIScrollableView *aScrollableView) { nsIScrollableFrame *sf = GetScrollableFrameFor(aScrollableView); return sf ? sf->GetScrollbarStyles() : nsPresContext::ScrollbarStyles(NS_STYLE_OVERFLOW_HIDDEN, NS_STYLE_OVERFLOW_HIDDEN); } // static nsIScrollableView* nsLayoutUtils::GetNearestScrollingView(nsIView* aView, Direction aDirection) { // If aDirection is eEither, find first view with a scrolllable frame. // Otherwise, find the first view that has a scrollable frame whose // ScrollbarStyles is not NS_STYLE_OVERFLOW_HIDDEN in aDirection // and where there is something currently not visible // that can be scrolled to in aDirection. NS_ASSERTION(aView, "GetNearestScrollingView expects a non-null view"); nsIScrollableView* scrollableView = nsnull; for (; aView; aView = aView->GetParent()) { scrollableView = aView->ToScrollableView(); if (scrollableView) { nsPresContext::ScrollbarStyles ss = nsLayoutUtils::ScrollbarStylesOfView(scrollableView); nsIScrollableFrame *scrollableFrame = GetScrollableFrameFor(scrollableView); NS_ASSERTION(scrollableFrame, "Must have scrollable frame for view!"); nsMargin margin = scrollableFrame->GetActualScrollbarSizes(); // Get size of total scrollable area nscoord totalWidth, totalHeight; scrollableView->GetContainerSize(&totalWidth, &totalHeight); // Get size of currently visible area nsSize visibleSize = aView->GetBounds().Size(); // aDirection can be eHorizontal, eVertical, or eEither // If scrolling in a specific direction, require visible scrollbars or // something to scroll to in that direction. if (aDirection != eHorizontal && ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN && (aDirection == eEither || totalHeight > visibleSize.height || margin.LeftRight())) break; if (aDirection != eVertical && ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN && (aDirection == eEither || totalWidth > visibleSize.width || margin.TopBottom())) break; } } return scrollableView; } nsPoint nsLayoutUtils::GetDOMEventCoordinatesRelativeTo(nsIDOMEvent* aDOMEvent, nsIFrame* aFrame) { nsCOMPtr privateEvent(do_QueryInterface(aDOMEvent)); NS_ASSERTION(privateEvent, "bad implementation"); if (!privateEvent) return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE); nsEvent* event; nsresult rv = privateEvent->GetInternalNSEvent(&event); if (NS_FAILED(rv)) return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE); return GetEventCoordinatesRelativeTo(event, aFrame); } nsPoint nsLayoutUtils::GetEventCoordinatesRelativeTo(nsEvent* aEvent, nsIFrame* aFrame) { if (!aEvent || (aEvent->eventStructType != NS_MOUSE_EVENT && aEvent->eventStructType != NS_MOUSE_SCROLL_EVENT)) return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE); nsGUIEvent* GUIEvent = NS_STATIC_CAST(nsGUIEvent*, aEvent); if (!GUIEvent->widget) return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE); // If it is, or is a descendant of, an SVG foreignobject frame, // then we need to do extra work nsIFrame* rootFrame = aFrame; for (nsIFrame* f = aFrame; f; f = GetCrossDocParentFrame(f)) { #ifdef MOZ_SVG_FOREIGNOBJECT if (f->IsFrameOfType(nsIFrame::eSVGForeignObject) && f->GetFirstChild(nsnull)) { nsSVGForeignObjectFrame* fo = NS_STATIC_CAST(nsSVGForeignObjectFrame*, f); nsIFrame* outer = nsSVGUtils::GetOuterSVGFrame(fo); return fo->TransformPointFromOuter( GetEventCoordinatesRelativeTo(aEvent, outer)) - aFrame->GetOffsetTo(fo->GetFirstChild(nsnull)); } #endif rootFrame = f; } nsIView* rootView = rootFrame->GetView(); if (!rootView) return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE); nsPoint widgetToView = TranslateWidgetToView(rootFrame->GetPresContext(), GUIEvent->widget, GUIEvent->refPoint, rootView); if (widgetToView == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE)) return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE); return widgetToView - aFrame->GetOffsetTo(rootFrame); } nsPoint nsLayoutUtils::GetEventCoordinatesForNearestView(nsEvent* aEvent, nsIFrame* aFrame, nsIView** aView) { if (!aEvent || (aEvent->eventStructType != NS_MOUSE_EVENT && aEvent->eventStructType != NS_MOUSE_SCROLL_EVENT)) return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE); nsGUIEvent* GUIEvent = NS_STATIC_CAST(nsGUIEvent*, aEvent); if (!GUIEvent->widget) return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE); nsPoint viewToFrame; nsIView* frameView; aFrame->GetOffsetFromView(viewToFrame, &frameView); if (aView) *aView = frameView; return TranslateWidgetToView(aFrame->GetPresContext(), GUIEvent->widget, GUIEvent->refPoint, frameView); } nsPoint nsLayoutUtils::TranslateWidgetToView(nsPresContext* aPresContext, nsIWidget* aWidget, nsIntPoint aPt, nsIView* aView) { nsIView* baseView = nsIView::GetViewFor(aWidget); if (!baseView) return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE); nsPoint viewToWidget; nsIWidget* wid = baseView->GetNearestWidget(&viewToWidget); NS_ASSERTION(aWidget == wid, "Clashing widgets"); float pixelsToTwips = aPresContext->PixelsToTwips(); nsPoint refPointTwips(NSIntPixelsToTwips(aPt.x, pixelsToTwips), NSIntPixelsToTwips(aPt.y, pixelsToTwips)); return refPointTwips - viewToWidget - aView->GetOffsetTo(baseView); } // Combine aNewBreakType with aOrigBreakType, but limit the break types // to NS_STYLE_CLEAR_LEFT, RIGHT, LEFT_AND_RIGHT. PRUint8 nsLayoutUtils::CombineBreakType(PRUint8 aOrigBreakType, PRUint8 aNewBreakType) { PRUint8 breakType = aOrigBreakType; switch(breakType) { case NS_STYLE_CLEAR_LEFT: if ((NS_STYLE_CLEAR_RIGHT == aNewBreakType) || (NS_STYLE_CLEAR_LEFT_AND_RIGHT == aNewBreakType)) { breakType = NS_STYLE_CLEAR_LEFT_AND_RIGHT; } break; case NS_STYLE_CLEAR_RIGHT: if ((NS_STYLE_CLEAR_LEFT == aNewBreakType) || (NS_STYLE_CLEAR_LEFT_AND_RIGHT == aNewBreakType)) { breakType = NS_STYLE_CLEAR_LEFT_AND_RIGHT; } break; case NS_STYLE_CLEAR_NONE: if ((NS_STYLE_CLEAR_LEFT == aNewBreakType) || (NS_STYLE_CLEAR_RIGHT == aNewBreakType) || (NS_STYLE_CLEAR_LEFT_AND_RIGHT == aNewBreakType)) { breakType = aNewBreakType; } } return breakType; } PRBool nsLayoutUtils::IsInitialContainingBlock(nsIFrame* aFrame) { return aFrame == aFrame->GetPresContext()->PresShell()->FrameConstructor()->GetInitialContainingBlock(); } #ifdef DEBUG #include static PRBool gDumpPaintList = PR_FALSE; static PRBool gDumpEventList = PR_FALSE; static PRBool gDumpRepaintRegionForCopy = PR_FALSE; #endif nsIFrame* nsLayoutUtils::GetFrameForPoint(nsIFrame* aFrame, nsPoint aPt) { nsDisplayListBuilder builder(aFrame, PR_TRUE, PR_FALSE); nsDisplayList list; nsRect target(aPt, nsSize(1, 1)); builder.EnterPresShell(aFrame, target); nsresult rv = aFrame->BuildDisplayListForStackingContext(&builder, target, &list); builder.LeavePresShell(aFrame, target); NS_ENSURE_SUCCESS(rv, nsnull); #ifdef DEBUG if (gDumpEventList) { fprintf(stderr, "Event handling --- (%d,%d):\n", aPt.x, aPt.y); nsIFrameDebug::PrintDisplayList(&builder, list); } #endif nsIFrame* result = list.HitTest(&builder, aPt); list.DeleteAll(); return result; } /** * A simple display item that just renders a solid color across the entire * visible area. */ class nsDisplaySolidColor : public nsDisplayItem { public: nsDisplaySolidColor(nsIFrame* aFrame, nscolor aColor) : nsDisplayItem(aFrame), mColor(aColor) { MOZ_COUNT_CTOR(nsDisplaySolidColor); } #ifdef NS_BUILD_REFCNT_LOGGING virtual ~nsDisplaySolidColor() { MOZ_COUNT_DTOR(nsDisplaySolidColor); } #endif virtual void Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx, const nsRect& aDirtyRect); NS_DISPLAY_DECL_NAME("SolidColor") private: nscolor mColor; }; void nsDisplaySolidColor::Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx, const nsRect& aDirtyRect) { aCtx->SetColor(mColor); aCtx->FillRect(aDirtyRect); } nsresult nsLayoutUtils::PaintFrame(nsIRenderingContext* aRenderingContext, nsIFrame* aFrame, const nsRegion& aDirtyRegion, nscolor aBackground) { nsDisplayListBuilder builder(aFrame, PR_FALSE, PR_TRUE); nsDisplayList list; nsRect dirtyRect = aDirtyRegion.GetBounds(); builder.EnterPresShell(aFrame, dirtyRect); nsresult rv = aFrame->BuildDisplayListForStackingContext(&builder, dirtyRect, &list); builder.LeavePresShell(aFrame, dirtyRect); NS_ENSURE_SUCCESS(rv, rv); if (NS_GET_A(aBackground) > 0) { // Fill the visible area with a background color. In the common case, // the visible area is entirely covered by the background of the root // document (at least!) so this will be removed by the optimizer. In some // cases we might not have a root frame, so this will prevent garbage // from being drawn. rv = list.AppendNewToBottom(new (&builder) nsDisplaySolidColor(aFrame, aBackground)); NS_ENSURE_SUCCESS(rv, rv); } #ifdef DEBUG if (gDumpPaintList) { fprintf(stderr, "Painting --- before optimization (dirty %d,%d,%d,%d):\n", dirtyRect.x, dirtyRect.y, dirtyRect.width, dirtyRect.height); nsIFrameDebug::PrintDisplayList(&builder, list); } #endif nsRegion visibleRegion = aDirtyRegion; list.OptimizeVisibility(&builder, &visibleRegion); #ifdef DEBUG if (gDumpPaintList) { fprintf(stderr, "Painting --- after optimization:\n"); nsIFrameDebug::PrintDisplayList(&builder, list); } #endif list.Paint(&builder, aRenderingContext, aDirtyRegion.GetBounds()); // Flush the list so we don't trigger the IsEmpty-on-destruction assertion list.DeleteAll(); return NS_OK; } static void AccumulateItemInRegion(nsRegion* aRegion, const nsRect& aAreaRect, const nsRect& aItemRect, nsDisplayItem* aItem) { nsRect damageRect; if (damageRect.IntersectRect(aAreaRect, aItemRect)) { #ifdef DEBUG if (gDumpRepaintRegionForCopy) { fprintf(stderr, "Adding rect %d,%d,%d,%d for frame %p\n", damageRect.x, damageRect.y, damageRect.width, damageRect.height, (void*)aItem->GetUnderlyingFrame()); } #endif aRegion->Or(*aRegion, damageRect); } } static void AddItemsToRegion(nsDisplayListBuilder* aBuilder, nsDisplayList* aList, const nsRect& aRect, const nsRect& aClipRect, nsPoint aDelta, nsRegion* aRegion) { for (nsDisplayItem* item = aList->GetBottom(); item; item = item->GetAbove()) { nsDisplayList* sublist = item->GetList(); if (sublist) { if (item->GetType() == nsDisplayItem::TYPE_CLIP) { nsRect clip; clip.IntersectRect(aClipRect, NS_STATIC_CAST(nsDisplayClip*, item)->GetClipRect()); AddItemsToRegion(aBuilder, sublist, aRect, clip, aDelta, aRegion); } else { // opacity, or a generic sublist AddItemsToRegion(aBuilder, sublist, aRect, aClipRect, aDelta, aRegion); } } else { // Items left in the list are either IsVaryingRelativeToFrame // or !IsMovingFrame (i.e., not in the moving subtree) nsRect r; if (r.IntersectRect(aClipRect, item->GetBounds(aBuilder))) { PRBool inMovingSubtree = PR_FALSE; if (item->IsVaryingRelativeToFrame(aBuilder, aBuilder->GetRootMovingFrame())) { nsIFrame* f = item->GetUnderlyingFrame(); NS_ASSERTION(f, "Must have an underlying frame for leaf item"); inMovingSubtree = aBuilder->IsMovingFrame(f); AccumulateItemInRegion(aRegion, aRect + aDelta, r, item); } if (!inMovingSubtree) { // if it's uniform and it includes both the old and new areas, then // we don't need to paint it PRBool skip = r.Contains(aRect) && r.Contains(aRect + aDelta) && item->IsUniform(aBuilder); if (!skip) { // area where a non-moving element is visible must be repainted AccumulateItemInRegion(aRegion, aRect + aDelta, r, item); // we may have bitblitted an area that was painted by a non-moving // element. This bitblitted data is invalid and was copied to // "r + aDelta". AccumulateItemInRegion(aRegion, aRect + aDelta, r + aDelta, item); } } } } } } nsresult nsLayoutUtils::ComputeRepaintRegionForCopy(nsIFrame* aRootFrame, nsIFrame* aMovingFrame, nsPoint aDelta, const nsRect& aCopyRect, nsRegion* aRepaintRegion) { NS_ASSERTION(aRootFrame != aMovingFrame, "The root frame shouldn't be the one that's moving, that makes no sense"); // Build the 'after' display list over the whole area of interest. // Frames under aMovingFrame will not be allowed to affect (clip or cover) // non-moving frame display items ... then we can be sure the non-moving // frame display items we get are the same ones we would have gotten if // we had constructed the 'before' display list. // (We have to build the 'after' display list because the frame/view // hierarchy has already been updated for the move.) nsRect rect; rect.UnionRect(aCopyRect, aCopyRect + aDelta); nsDisplayListBuilder builder(aRootFrame, PR_FALSE, PR_TRUE, aMovingFrame); nsDisplayList list; builder.EnterPresShell(aRootFrame, rect); nsresult rv = aRootFrame->BuildDisplayListForStackingContext(&builder, rect, &list); builder.LeavePresShell(aRootFrame, rect); NS_ENSURE_SUCCESS(rv, rv); #ifdef DEBUG if (gDumpRepaintRegionForCopy) { fprintf(stderr, "Repaint region for copy --- before optimization (area %d,%d,%d,%d, frame %p):\n", rect.x, rect.y, rect.width, rect.height, (void*)aMovingFrame); nsIFrameDebug::PrintDisplayList(&builder, list); } #endif // Optimize for visibility, but frames under aMovingFrame will not be // considered opaque, so they don't cover non-moving frames. nsRegion visibleRegion(aCopyRect); visibleRegion.Or(visibleRegion, aCopyRect + aDelta); list.OptimizeVisibility(&builder, &visibleRegion); #ifdef DEBUG if (gDumpRepaintRegionForCopy) { fprintf(stderr, "Repaint region for copy --- after optimization:\n"); nsIFrameDebug::PrintDisplayList(&builder, list); } #endif aRepaintRegion->SetEmpty(); // Any visible non-moving display items get added to the repaint region // a) at their current location and b) offset by -aPt (their position in // the 'before' display list) (unless they're uniform and we can exclude them). // Also, any visible position-varying display items get added to the // repaint region. All these areas are confined to aCopyRect+aDelta. // We could do more work here: e.g., do another optimize-visibility pass // with the moving items taken into account, either on the before-list // or the after-list, or even both if we cloned the display lists ... but // it's probably not worth it. AddItemsToRegion(&builder, &list, aCopyRect, rect, aDelta, aRepaintRegion); // Flush the list so we don't trigger the IsEmpty-on-destruction assertion list.DeleteAll(); return NS_OK; } nsresult nsLayoutUtils::CreateOffscreenContext(nsIDeviceContext* deviceContext, nsIDrawingSurface* surface, const nsRect& aRect, nsIRenderingContext** aResult) { nsresult rv; nsIRenderingContext *context = nsnull; rv = deviceContext->CreateRenderingContext(surface, context); NS_ENSURE_SUCCESS(rv, rv); // always initialize clipping, linux won't draw images otherwise. nsRect clip(0, 0, aRect.width, aRect.height); context->SetClipRect(clip, nsClipCombine_kReplace); context->Translate(-aRect.x, -aRect.y); *aResult = context; return NS_OK; } PRInt32 nsLayoutUtils::GetZIndex(nsIFrame* aFrame) { if (!aFrame->GetStyleDisplay()->IsPositioned()) return 0; const nsStylePosition* position = aFrame->GetStylePosition(); if (position->mZIndex.GetUnit() == eStyleUnit_Integer) return position->mZIndex.GetIntValue(); // sort the auto and 0 elements together return 0; } /** * Uses a binary search for find where the cursor falls in the line of text * It also keeps track of the part of the string that has already been measured * so it doesn't have to keep measuring the same text over and over * * @param "aBaseWidth" contains the width in twips of the portion * of the text that has already been measured, and aBaseInx contains * the index of the text that has already been measured. * * @param aTextWidth returns the (in twips) the length of the text that falls * before the cursor aIndex contains the index of the text where the cursor falls */ PRBool nsLayoutUtils::BinarySearchForPosition(nsIRenderingContext* aRendContext, const PRUnichar* aText, PRInt32 aBaseWidth, PRInt32 aBaseInx, PRInt32 aStartInx, PRInt32 aEndInx, PRInt32 aCursorPos, PRInt32& aIndex, PRInt32& aTextWidth) { PRInt32 range = aEndInx - aStartInx; if ((range == 1) || (range == 2 && NS_IS_HIGH_SURROGATE(aText[aStartInx]))) { aIndex = aStartInx + aBaseInx; aRendContext->GetWidth(aText, aIndex, aTextWidth); return PR_TRUE; } PRInt32 inx = aStartInx + (range / 2); // Make sure we don't leave a dangling low surrogate if (NS_IS_HIGH_SURROGATE(aText[inx-1])) inx++; PRInt32 textWidth = 0; aRendContext->GetWidth(aText, inx, textWidth); PRInt32 fullWidth = aBaseWidth + textWidth; if (fullWidth == aCursorPos) { aTextWidth = textWidth; aIndex = inx; return PR_TRUE; } else if (aCursorPos < fullWidth) { aTextWidth = aBaseWidth; if (BinarySearchForPosition(aRendContext, aText, aBaseWidth, aBaseInx, aStartInx, inx, aCursorPos, aIndex, aTextWidth)) { return PR_TRUE; } } else { aTextWidth = fullWidth; if (BinarySearchForPosition(aRendContext, aText, aBaseWidth, aBaseInx, inx, aEndInx, aCursorPos, aIndex, aTextWidth)) { return PR_TRUE; } } return PR_FALSE; } void nsLayoutUtils::ScrollIntoView(nsIFormControlFrame* aFormFrame) { NS_ASSERTION(aFormFrame, "Null frame passed into ScrollIntoView"); nsIFrame* frame = nsnull; CallQueryInterface(aFormFrame, &frame); NS_ASSERTION(frame, "Form frame did not implement nsIFrame."); if (frame) { nsIPresShell* presShell = frame->GetPresContext()->GetPresShell(); if (presShell) { presShell->ScrollFrameIntoView(frame, NS_PRESSHELL_SCROLL_IF_NOT_VISIBLE, NS_PRESSHELL_SCROLL_IF_NOT_VISIBLE); } } } nsRect nsLayoutUtils::GetAllInFlowBoundingRect(nsIFrame* aFrame) { // Get the union of all rectangles in this and continuation frames nsRect r = aFrame->GetRect(); nsIFrame* parent = aFrame->GetParent(); if (!parent) return r; for (nsIFrame* f = aFrame->GetNextContinuation(); f; f = f->GetNextContinuation()) { r.UnionRect(r, f->GetRect() + f->GetOffsetTo(parent)); } if (r.IsEmpty()) { // It could happen that all the rects are empty (eg zero-width or // zero-height). In that case, use the first rect for the frame. r = aFrame->GetRect(); } return r - aFrame->GetPosition(); } nsresult nsLayoutUtils::GetFontMetricsForFrame(nsIFrame* aFrame, nsIFontMetrics** aFontMetrics) { nsStyleContext* sc = aFrame->GetStyleContext(); return aFrame->GetPresContext()->DeviceContext()-> GetMetricsFor(sc->GetStyleFont()->mFont, sc->GetStyleVisibility()->mLangGroup, *aFontMetrics); } nsIFrame* nsLayoutUtils::FindChildContainingDescendant(nsIFrame* aParent, nsIFrame* aDescendantFrame) { nsIFrame* result = aDescendantFrame; while (result) { nsIFrame* parent = result->GetParent(); if (parent == aParent) { break; } // The frame is not an immediate child of aParent so walk up another level result = parent; } return result; } nsBlockFrame* nsLayoutUtils::FindNearestBlockAncestor(nsIFrame* aFrame) { nsIFrame* nextAncestor; for (nextAncestor = aFrame->GetParent(); nextAncestor; nextAncestor = nextAncestor->GetParent()) { nsBlockFrame* block; if (NS_SUCCEEDED(nextAncestor->QueryInterface(kBlockFrameCID, (void**)&block))) return block; } return nsnull; } nsIFrame* nsLayoutUtils::GetParentOrPlaceholderFor(nsFrameManager* aFrameManager, nsIFrame* aFrame) { if (aFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW) return aFrameManager->GetPlaceholderFrameFor(aFrame); return aFrame->GetParent(); } nsIFrame* nsLayoutUtils::GetClosestCommonAncestorViaPlaceholders(nsIFrame* aFrame1, nsIFrame* aFrame2, nsIFrame* aKnownCommonAncestorHint) { NS_PRECONDITION(aFrame1, "aFrame1 must not be null"); NS_PRECONDITION(aFrame2, "aFrame2 must not be null"); nsPresContext* presContext = aFrame1->GetPresContext(); if (presContext != aFrame2->GetPresContext()) { // different documents, no common ancestor return nsnull; } nsFrameManager* frameManager = presContext->PresShell()->FrameManager(); nsAutoVoidArray frame1Ancestors; nsIFrame* f1; for (f1 = aFrame1; f1 && f1 != aKnownCommonAncestorHint; f1 = GetParentOrPlaceholderFor(frameManager, f1)) { frame1Ancestors.AppendElement(f1); } if (!f1 && aKnownCommonAncestorHint) { // So, it turns out aKnownCommonAncestorHint was not an ancestor of f1. Oops. // Never mind. We can continue as if aKnownCommonAncestorHint was null. aKnownCommonAncestorHint = nsnull; } nsAutoVoidArray frame2Ancestors; nsIFrame* f2; for (f2 = aFrame2; f2 && f2 != aKnownCommonAncestorHint; f2 = GetParentOrPlaceholderFor(frameManager, f2)) { frame2Ancestors.AppendElement(f2); } if (!f2 && aKnownCommonAncestorHint) { // So, it turns out aKnownCommonAncestorHint was not an ancestor of f2. // We need to retry with no common ancestor hint. return GetClosestCommonAncestorViaPlaceholders(aFrame1, aFrame2, nsnull); } // now frame1Ancestors and frame2Ancestors give us the parent frame chain // up to aKnownCommonAncestorHint, or if that is null, up to and including // the root frame. We need to walk from the end (i.e., the top of the // frame (sub)tree) down to aFrame1/aFrame2 looking for the first difference. nsIFrame* lastCommonFrame = aKnownCommonAncestorHint; PRInt32 last1 = frame1Ancestors.Count() - 1; PRInt32 last2 = frame2Ancestors.Count() - 1; while (last1 >= 0 && last2 >= 0) { nsIFrame* frame1 = NS_STATIC_CAST(nsIFrame*, frame1Ancestors.ElementAt(last1)); if (frame1 != frame2Ancestors.ElementAt(last2)) break; lastCommonFrame = frame1; last1--; last2--; } return lastCommonFrame; } PRBool nsLayoutUtils::IsViewportScrollbarFrame(nsIFrame* aFrame) { if (!aFrame) return PR_FALSE; nsIFrame* rootScrollFrame = aFrame->GetPresContext()->PresShell()->GetRootScrollFrame(); if (!rootScrollFrame) return PR_FALSE; nsIScrollableFrame* rootScrollableFrame = nsnull; CallQueryInterface(rootScrollFrame, &rootScrollableFrame); NS_ASSERTION(rootScrollableFrame, "The root scorollable frame is null"); if (!IsProperAncestorFrame(rootScrollFrame, aFrame)) return PR_FALSE; nsIFrame* rootScrolledFrame = rootScrollableFrame->GetScrolledFrame(); return !(rootScrolledFrame == aFrame || IsProperAncestorFrame(rootScrolledFrame, aFrame)); } static nscoord AddPercents(nsLayoutUtils::IntrinsicWidthType aType, nscoord aCurrent, float aPercent) { nscoord result = aCurrent; if (aPercent > 0.0f && aType == nsLayoutUtils::PREF_WIDTH) { // XXX Should we also consider percentages for min widths, up to a // limit? if (aPercent >= 1.0f) result = nscoord_MAX; else result = NSToCoordRound(float(result) / (1.0f - aPercent)); } return result; } static PRBool GetAbsoluteCoord(const nsStyleCoord& aStyle, nsIRenderingContext* aRenderingContext, nsIFrame* aFrame, nscoord& aResult) { nsStyleUnit unit = aStyle.GetUnit(); if (eStyleUnit_Coord == unit) { aResult = aStyle.GetCoordValue(); return PR_TRUE; } if (eStyleUnit_Chars == unit) { SetFontFromStyle(aRenderingContext, aFrame->GetStyleContext()); nscoord fontWidth; aRenderingContext->GetWidth('M', fontWidth); aResult = aStyle.GetIntValue() * fontWidth; return PR_TRUE; } return PR_FALSE; } #undef DEBUG_INTRINSIC_WIDTH #ifdef DEBUG_INTRINSIC_WIDTH static PRInt32 gNoiseIndent = 0; #endif /* static */ nscoord nsLayoutUtils::IntrinsicForContainer(nsIRenderingContext *aRenderingContext, nsIFrame *aFrame, IntrinsicWidthType aType) { NS_PRECONDITION(aFrame, "null frame"); NS_PRECONDITION(aType == MIN_WIDTH || aType == PREF_WIDTH, "bad type"); #ifdef DEBUG_INTRINSIC_WIDTH nsFrame::IndentBy(stdout, gNoiseIndent); NS_STATIC_CAST(nsFrame*, aFrame)->ListTag(stdout); printf(" %s intrinsic width for container:\n", aType == MIN_WIDTH ? "min" : "pref"); #endif nsIFrame::IntrinsicWidthOffsetData offsets = aFrame->IntrinsicWidthOffsets(aRenderingContext); const nsStylePosition *stylePos = aFrame->GetStylePosition(); const PRUint8 boxSizing = stylePos->mBoxSizing; const nsStyleCoord &styleWidth = stylePos->mWidth; const nsStyleCoord &styleMinWidth = stylePos->mMinWidth; const nsStyleCoord &styleMaxWidth = stylePos->mMaxWidth; // We build up two values starting with the content box, and then // adding padding, border and margin. The result is normally // |result|. Then, when we handle 'width', 'min-width', and // 'max-width', we use the results we've been building in |min| as a // minimum, overriding 'min-width'. This ensures two things: // * that we don't let a value of 'box-sizing' specifying a width // smaller than the padding/border inside the box-sizing box give // a content width less than zero // * that we prevent tables from becoming smaller than their // intrinsic minimum width nscoord result = 0, min = 0; // If we have a specified width (or a specified 'min-width' greater // than the specified 'max-width', which works out to the same thing), // don't even bother getting the frame's intrinsic width. if (styleWidth.GetUnit() != eStyleUnit_Coord && (styleMinWidth.GetUnit() != eStyleUnit_Coord || styleMaxWidth.GetUnit() != eStyleUnit_Coord || styleMaxWidth.GetCoordValue() > styleMinWidth.GetCoordValue())) { #ifdef DEBUG_INTRINSIC_WIDTH ++gNoiseIndent; #endif if (aType == MIN_WIDTH) result = aFrame->GetMinWidth(aRenderingContext); else result = aFrame->GetPrefWidth(aRenderingContext); #ifdef DEBUG_INTRINSIC_WIDTH --gNoiseIndent; nsFrame::IndentBy(stdout, gNoiseIndent); NS_STATIC_CAST(nsFrame*, aFrame)->ListTag(stdout); printf(" %s intrinsic width from frame is %d.\n", aType == MIN_WIDTH ? "min" : "pref", result); #endif } if (aFrame->GetType() == nsGkAtoms::tableFrame) { // Tables can't shrink smaller than their intrinsic minimum width, // no matter what. min = aFrame->GetMinWidth(aRenderingContext); } // We also need to track what has been added on outside of the box // (controlled by 'box-sizing') where 'width', 'min-width' and // 'max-width' are applied. We have to account for these properties // after getting all the offsets (margin, border, padding) because // percentages do not operate linearly. // Doing this is ok because although percentages aren't handled // linearly, they are handled monotonically. nscoord coordOutsideWidth = offsets.hPadding; float pctOutsideWidth = offsets.hPctPadding; float pctTotal = 0.0f; if (boxSizing == NS_STYLE_BOX_SIZING_PADDING) { min += coordOutsideWidth; result += coordOutsideWidth; pctTotal += pctOutsideWidth; coordOutsideWidth = 0; pctOutsideWidth = 0.0f; } coordOutsideWidth += offsets.hBorder; if (boxSizing == NS_STYLE_BOX_SIZING_BORDER) { min += coordOutsideWidth; result += coordOutsideWidth; pctTotal += pctOutsideWidth; coordOutsideWidth = 0; pctOutsideWidth = 0.0f; } coordOutsideWidth += offsets.hMargin; pctOutsideWidth += offsets.hPctMargin; min += coordOutsideWidth; result += coordOutsideWidth; pctTotal += pctOutsideWidth; nscoord w; if (GetAbsoluteCoord(styleWidth, aRenderingContext, aFrame, w)) { result = AddPercents(aType, w + coordOutsideWidth, pctOutsideWidth); } else if (aType == MIN_WIDTH && eStyleUnit_Percent == styleWidth.GetUnit() && aFrame->IsFrameOfType(nsIFrame::eReplaced)) { // A percentage width on replaced elements means they can shrink to 0. result = 0; // let |min| handle padding/border/margin } else { result = AddPercents(aType, result, pctTotal); } nscoord maxw; if (GetAbsoluteCoord(styleMaxWidth, aRenderingContext, aFrame, maxw)) { maxw = AddPercents(aType, maxw + coordOutsideWidth, pctOutsideWidth); if (result > maxw) result = maxw; } nscoord minw; if (GetAbsoluteCoord(styleMinWidth, aRenderingContext, aFrame, minw)) { minw = AddPercents(aType, minw + coordOutsideWidth, pctOutsideWidth); if (result < minw) result = minw; } min = AddPercents(aType, min, pctTotal); if (result < min) result = min; const nsStyleDisplay *disp = aFrame->GetStyleDisplay(); if (aFrame->IsThemed(disp)) { nsSize size(0, 0); PRBool canOverride = PR_TRUE; nsPresContext *presContext = aFrame->GetPresContext(); presContext->GetTheme()-> GetMinimumWidgetSize(aRenderingContext, aFrame, disp->mAppearance, &size, &canOverride); // GMWS() returns size in pixels, we need to convert it back to twips float p2t = presContext->ScaledPixelsToTwips(); nscoord themeWidth = NSIntPixelsToTwips(size.width, p2t); // GMWS() returns a border-box width themeWidth += offsets.hMargin; themeWidth = AddPercents(aType, themeWidth, offsets.hPctMargin); if (themeWidth > result || !canOverride) result = themeWidth; } #ifdef DEBUG_INTRINSIC_WIDTH nsFrame::IndentBy(stdout, gNoiseIndent); NS_STATIC_CAST(nsFrame*, aFrame)->ListTag(stdout); printf(" %s intrinsic width for container is %d twips.\n", aType == MIN_WIDTH ? "min" : "pref", result); #endif return result; } /* static */ nscoord nsLayoutUtils::ComputeWidthDependentValue( nsIRenderingContext* aRenderingContext, nsIFrame* aFrame, nscoord aContainingBlockWidth, const nsStyleCoord& aCoord) { NS_PRECONDITION(aFrame, "non-null frame expected"); NS_PRECONDITION(aRenderingContext, "non-null rendering context expected"); NS_PRECONDITION(aContainingBlockWidth != NS_UNCONSTRAINEDSIZE, "unconstrained widths no longer supported"); nscoord result; if (GetAbsoluteCoord(aCoord, aRenderingContext, aFrame, result)) { return result; } if (eStyleUnit_Percent == aCoord.GetUnit()) { return NSToCoordFloor(aContainingBlockWidth * aCoord.GetPercentValue()); } return 0; } /* static */ nscoord nsLayoutUtils::ComputeHeightDependentValue( nsIRenderingContext* aRenderingContext, nsIFrame* aFrame, nscoord aContainingBlockHeight, const nsStyleCoord& aCoord) { NS_PRECONDITION(aFrame, "non-null frame expected"); NS_PRECONDITION(aRenderingContext, "non-null rendering context expected"); nscoord result; if (GetAbsoluteCoord(aCoord, aRenderingContext, aFrame, result)) { return result; } if (eStyleUnit_Percent == aCoord.GetUnit()) { // XXXldb Some callers explicitly check aContainingBlockHeight // against NS_AUTOHEIGHT *and* unit against eStyleUnit_Percent // before calling this function, so this assertion probably needs to // be inside the percentage case. However, it would be much more // likely to catch problems if it were at the start of the function. // XXXldb Many callers pass a non-'auto' containing block height when // according to CSS2.1 they should be passing 'auto'. NS_PRECONDITION(NS_AUTOHEIGHT != aContainingBlockHeight, "unexpected 'containing block height'"); if (NS_AUTOHEIGHT != aContainingBlockHeight) { return NSToCoordFloor(aContainingBlockHeight * aCoord.GetPercentValue()); } } return 0; } inline PRBool IsAutoHeight(const nsStyleCoord &aCoord, nscoord aCBHeight) { nsStyleUnit unit = aCoord.GetUnit(); return unit == eStyleUnit_Auto || // only for 'height' unit == eStyleUnit_Null || // only for 'max-height' (unit == eStyleUnit_Percent && aCBHeight == NS_AUTOHEIGHT); } /* static */ nsSize nsLayoutUtils::ComputeSizeWithIntrinsicDimensions( nsIRenderingContext* aRenderingContext, nsIFrame* aFrame, nsSize aIntrinsicSize, nsSize aCBSize, nsSize aBorder, nsSize aPadding) { const nsStylePosition *stylePos = aFrame->GetStylePosition(); // Handle intrinsic sizes and their interaction with // {min-,max-,}{width,height} according to the rules in // http://www.w3.org/TR/CSS21/visudet.html#min-max-widths // Note: throughout the following section of the function, I avoid // a * (b / c) because of its reduced accuracy relative to a * b / c // or (a * b) / c (which are equivalent). PRBool isAutoWidth = stylePos->mWidth.GetUnit() == eStyleUnit_Auto; PRBool isAutoHeight = IsAutoHeight(stylePos->mHeight, aCBSize.height); nsSize boxSizingAdjust(0,0); switch (stylePos->mBoxSizing) { case NS_STYLE_BOX_SIZING_BORDER: boxSizingAdjust += aBorder; // fall through case NS_STYLE_BOX_SIZING_PADDING: boxSizingAdjust += aPadding; } nscoord width, minWidth, maxWidth, height, minHeight, maxHeight; if (!isAutoWidth) { width = nsLayoutUtils::ComputeWidthDependentValue(aRenderingContext, aFrame, aCBSize.width, stylePos->mWidth) - boxSizingAdjust.width; if (width < 0) width = 0; } if (stylePos->mMaxWidth.GetUnit() != eStyleUnit_Null) { maxWidth = nsLayoutUtils::ComputeWidthDependentValue(aRenderingContext, aFrame, aCBSize.width, stylePos->mMaxWidth) - boxSizingAdjust.width; if (maxWidth < 0) maxWidth = 0; } else { maxWidth = nscoord_MAX; } minWidth = nsLayoutUtils::ComputeWidthDependentValue(aRenderingContext, aFrame, aCBSize.width, stylePos->mMinWidth) - boxSizingAdjust.width; if (minWidth < 0) minWidth = 0; if (!isAutoHeight) { height = nsLayoutUtils::ComputeHeightDependentValue(aRenderingContext, aFrame, aCBSize.height, stylePos->mHeight) - boxSizingAdjust.height; if (height < 0) height = 0; } if (!IsAutoHeight(stylePos->mMaxHeight, aCBSize.height)) { maxHeight = nsLayoutUtils::ComputeHeightDependentValue(aRenderingContext, aFrame, aCBSize.height, stylePos->mMaxHeight) - boxSizingAdjust.height; if (maxHeight < 0) maxHeight = 0; } else { maxHeight = nscoord_MAX; } if (!IsAutoHeight(stylePos->mMinHeight, aCBSize.height)) { minHeight = nsLayoutUtils::ComputeHeightDependentValue(aRenderingContext, aFrame, aCBSize.height, stylePos->mMinHeight) - boxSizingAdjust.height; if (minHeight < 0) minHeight = 0; } else { minHeight = 0; } if (isAutoWidth) { if (isAutoHeight) { // 'auto' width, 'auto' height if (minWidth > maxWidth) maxWidth = minWidth; if (minHeight > maxHeight) maxHeight = minHeight; nscoord heightAtMaxWidth, heightAtMinWidth, widthAtMaxHeight, widthAtMinHeight; if (aIntrinsicSize.width > 0) { heightAtMaxWidth = maxWidth * aIntrinsicSize.height / aIntrinsicSize.width; if (heightAtMaxWidth < minHeight) heightAtMaxWidth = minHeight; heightAtMinWidth = minWidth * aIntrinsicSize.height / aIntrinsicSize.width; if (heightAtMinWidth > maxHeight) heightAtMinWidth = maxHeight; } else { heightAtMaxWidth = aIntrinsicSize.height; heightAtMinWidth = aIntrinsicSize.height; } if (aIntrinsicSize.height > 0) { widthAtMaxHeight = maxHeight * aIntrinsicSize.width / aIntrinsicSize.height; if (widthAtMaxHeight < minWidth) widthAtMaxHeight = minWidth; widthAtMinHeight = minHeight * aIntrinsicSize.width / aIntrinsicSize.height; if (widthAtMinHeight > maxWidth) widthAtMinHeight = maxWidth; } else { widthAtMaxHeight = aIntrinsicSize.width; widthAtMinHeight = aIntrinsicSize.width; } if (aIntrinsicSize.width > maxWidth) { if (aIntrinsicSize.height > maxHeight) { if (maxWidth * aIntrinsicSize.height <= maxHeight * aIntrinsicSize.width) { width = maxWidth; height = heightAtMaxWidth; } else { height = maxHeight; width = widthAtMaxHeight; } } else { width = maxWidth; height = heightAtMaxWidth; } } else if (aIntrinsicSize.width < minWidth) { if (aIntrinsicSize.height < minHeight) { if (minWidth * aIntrinsicSize.height <= minHeight * aIntrinsicSize.width) { height = minHeight; width = widthAtMinHeight; } else { width = minWidth; height = heightAtMinWidth; } } else { width = minWidth; height = heightAtMinWidth; } } else { if (aIntrinsicSize.height > maxHeight) { height = maxHeight; width = widthAtMaxHeight; } else if (aIntrinsicSize.height < minHeight) { height = minHeight; width = widthAtMinHeight; } else { width = aIntrinsicSize.width; height = aIntrinsicSize.height; } } } else { // 'auto' width, non-'auto' height height = NS_CSS_MINMAX(height, minHeight, maxHeight); if (aIntrinsicSize.height != 0) { width = aIntrinsicSize.width * height / aIntrinsicSize.height; } else { width = aIntrinsicSize.width; } width = NS_CSS_MINMAX(width, minWidth, maxWidth); } } else { if (isAutoHeight) { // non-'auto' width, 'auto' height width = NS_CSS_MINMAX(width, minWidth, maxWidth); if (aIntrinsicSize.width != 0) { height = aIntrinsicSize.height * width / aIntrinsicSize.width; } else { height = aIntrinsicSize.height; } height = NS_CSS_MINMAX(height, minHeight, maxHeight); } else { // non-'auto' width, non-'auto' height height = NS_CSS_MINMAX(height, minHeight, maxHeight); width = NS_CSS_MINMAX(width, minWidth, maxWidth); } } return nsSize(width, height); } /* static */ nscoord nsLayoutUtils::MinWidthFromInline(nsIFrame *aFrame, nsIRenderingContext *aRenderingContext) { nsIFrame::InlineMinWidthData data; DISPLAY_MIN_WIDTH(aFrame, data.prevLines); aFrame->AddInlineMinWidth(aRenderingContext, &data); data.Break(aRenderingContext); return data.prevLines; } /* static */ nscoord nsLayoutUtils::PrefWidthFromInline(nsIFrame *aFrame, nsIRenderingContext *aRenderingContext) { nsIFrame::InlinePrefWidthData data; DISPLAY_PREF_WIDTH(aFrame, data.prevLines); aFrame->AddInlinePrefWidth(aRenderingContext, &data); data.Break(aRenderingContext); return data.prevLines; }