зеркало из https://github.com/mozilla/pjs.git
495 строки
16 KiB
C++
495 строки
16 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* ***** 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):
|
|
*
|
|
* 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 "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"
|
|
|
|
/**
|
|
* 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 in flow frame
|
|
nsIFrame* lastInFlow = aFrame->GetLastInFlow();
|
|
|
|
// Get the last child frame
|
|
nsIFrame* firstChildFrame = lastInFlow->GetFirstChild(nsnull);
|
|
if (firstChildFrame) {
|
|
nsFrameList frameList(firstChildFrame);
|
|
nsIFrame* lastChildFrame = frameList.LastChild();
|
|
|
|
NS_ASSERTION(lastChildFrame, "unexpected error");
|
|
|
|
// Get the frame's first-in-flow. This matters in case the frame has
|
|
// been continuted across multiple lines
|
|
lastChildFrame = lastChildFrame->GetFirstInFlow();
|
|
|
|
// 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->GetPrevInFlow(), "aFrame must be first-in-flow");
|
|
|
|
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() == nsLayoutAtoms::pageFrame) {
|
|
return frame;
|
|
}
|
|
}
|
|
return nsnull;
|
|
}
|
|
|
|
nsIFrame*
|
|
nsLayoutUtils::GetFloatFromPlaceholder(nsIFrame* aFrame) {
|
|
if (nsLayoutAtoms::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
|
|
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;
|
|
nsIContent* c1;
|
|
for (c1 = aContent1; c1 && c1 != aCommonAncestor; c1 = c1->GetParent()) {
|
|
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;
|
|
nsIContent* c2;
|
|
for (c2 = aContent2; c2 && c2 != aCommonAncestor; c2 = c2->GetParent()) {
|
|
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;
|
|
nsIContent* content1Ancestor = nsnull;
|
|
nsIContent* content2Ancestor = nsnull;
|
|
while (last1 >= 0 && last2 >= 0
|
|
&& ((content1Ancestor = NS_STATIC_CAST(nsIContent*, content1Ancestors.ElementAt(last1)))
|
|
== (content2Ancestor = NS_STATIC_CAST(nsIContent*, content2Ancestors.ElementAt(last2))))) {
|
|
last1--;
|
|
last2--;
|
|
}
|
|
|
|
if (last1 < 0) {
|
|
if (last2 < 0) {
|
|
NS_ASSERTION(aContent1 == aContent2, "internal error?");
|
|
return 0;
|
|
} else {
|
|
// aContent1 is an ancestor of aContent2
|
|
return aIf1Ancestor;
|
|
}
|
|
} else {
|
|
if (last2 < 0) {
|
|
// aContent2 is an ancestor of aContent1
|
|
return aIf2Ancestor;
|
|
} else {
|
|
// content1Ancestor != content2Ancestor, so they must be siblings with the same parent
|
|
nsIContent* parent = content1Ancestor->GetParent();
|
|
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* 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.right))
|
|
break;
|
|
if (aDirection != eVertical &&
|
|
ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN &&
|
|
(aDirection == eEither || totalWidth > visibleSize.width || margin.bottom))
|
|
break;
|
|
}
|
|
}
|
|
return scrollableView;
|
|
}
|
|
|
|
nsPoint
|
|
nsLayoutUtils::GetDOMEventCoordinatesRelativeTo(nsIDOMEvent* aDOMEvent, nsIFrame* aFrame)
|
|
{
|
|
nsCOMPtr<nsIPrivateDOMEvent> 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);
|
|
if (!event || event->eventStructType != NS_MOUSE_EVENT)
|
|
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
|
|
|
|
nsGUIEvent* GUIEvent = NS_STATIC_CAST(nsGUIEvent*, event);
|
|
if (!GUIEvent->widget)
|
|
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
|
|
nsIView* view = nsIView::GetViewFor(GUIEvent->widget);
|
|
if (!view)
|
|
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
|
|
|
|
nsPoint widgetToView;
|
|
view->GetNearestWidget(&widgetToView);
|
|
nsPoint viewToFrame;
|
|
nsIView* frameView = aFrame->GetClosestView(&viewToFrame);
|
|
|
|
float p2t = aFrame->GetPresContext()->PixelsToTwips();
|
|
nsPoint mousePt(NSIntPixelsToTwips(GUIEvent->refPoint.x, p2t),
|
|
NSIntPixelsToTwips(GUIEvent->refPoint.y, p2t));
|
|
return mousePt + widgetToView + (-frameView->GetOffsetTo(view)) + viewToFrame;
|
|
}
|
|
|
|
// 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();
|
|
}
|