mirror of
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265 lines
9.5 KiB
C++
265 lines
9.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Pierre Phaneuf <pp@ludusdesign.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsSelectsAreaFrame.h"
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#include "nsCOMPtr.h"
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#include "nsIDOMHTMLOptionElement.h"
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#include "nsIContent.h"
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#include "nsListControlFrame.h"
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#include "nsDisplayList.h"
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nsIFrame*
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NS_NewSelectsAreaFrame(nsIPresShell* aShell, nsStyleContext* aContext, PRUint32 aFlags)
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{
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nsSelectsAreaFrame* it = new (aShell) nsSelectsAreaFrame(aContext);
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if (it) {
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// We need NS_BLOCK_SPACE_MGR to ensure that the options inside the select
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// aren't expanded by right floats outside the select.
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it->SetFlags(aFlags | NS_BLOCK_SPACE_MGR);
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}
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return it;
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}
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//---------------------------------------------------------
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PRBool
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nsSelectsAreaFrame::IsOptionElement(nsIContent* aContent)
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{
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PRBool result = PR_FALSE;
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nsCOMPtr<nsIDOMHTMLOptionElement> optElem;
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if (NS_SUCCEEDED(aContent->QueryInterface(NS_GET_IID(nsIDOMHTMLOptionElement),(void**) getter_AddRefs(optElem)))) {
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if (optElem != nsnull) {
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result = PR_TRUE;
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}
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}
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return result;
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}
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//---------------------------------------------------------
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PRBool
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nsSelectsAreaFrame::IsOptionElementFrame(nsIFrame *aFrame)
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{
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nsIContent *content = aFrame->GetContent();
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if (content) {
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return IsOptionElement(content);
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}
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return PR_FALSE;
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}
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/**
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* This wrapper class lets us redirect mouse hits from the child frame of
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* an option element to the element's own frame.
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* REVIEW: This is what nsSelectsAreaFrame::GetFrameForPoint used to do
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*/
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class nsDisplayOptionEventGrabber : public nsDisplayWrapList {
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public:
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nsDisplayOptionEventGrabber(nsIFrame* aFrame, nsDisplayItem* aItem)
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: nsDisplayWrapList(aFrame, aItem) {}
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nsDisplayOptionEventGrabber(nsIFrame* aFrame, nsDisplayList* aList)
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: nsDisplayWrapList(aFrame, aList) {}
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virtual nsIFrame* HitTest(nsDisplayListBuilder* aBuilder, nsPoint aPt);
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NS_DISPLAY_DECL_NAME("OptionEventGrabber")
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virtual nsDisplayWrapList* WrapWithClone(nsDisplayListBuilder* aBuilder,
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nsDisplayItem* aItem);
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};
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nsIFrame* nsDisplayOptionEventGrabber::HitTest(nsDisplayListBuilder* aBuilder,
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nsPoint aPt)
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{
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nsIFrame* frame = mList.HitTest(aBuilder, aPt);
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if (frame) {
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nsIFrame* selectedFrame = frame;
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while (selectedFrame &&
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!nsSelectsAreaFrame::IsOptionElementFrame(selectedFrame)) {
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selectedFrame = selectedFrame->GetParent();
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}
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if (selectedFrame) {
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return selectedFrame;
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}
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// else, keep the original result, which could be this frame
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}
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return frame;
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}
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nsDisplayWrapList* nsDisplayOptionEventGrabber::WrapWithClone(
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nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) {
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return new (aBuilder) nsDisplayOptionEventGrabber(aItem->GetUnderlyingFrame(), aItem);
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}
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class nsOptionEventGrabberWrapper : public nsDisplayWrapper
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{
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public:
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nsOptionEventGrabberWrapper() {}
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virtual nsDisplayItem* WrapList(nsDisplayListBuilder* aBuilder,
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nsIFrame* aFrame, nsDisplayList* aList) {
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// We can't specify the underlying frame here. We need this list to be
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// exploded if sorted.
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return new (aBuilder) nsDisplayOptionEventGrabber(nsnull, aList);
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}
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virtual nsDisplayItem* WrapItem(nsDisplayListBuilder* aBuilder,
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nsDisplayItem* aItem) {
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return new (aBuilder) nsDisplayOptionEventGrabber(aItem->GetUnderlyingFrame(), aItem);
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}
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};
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static nsListControlFrame* GetEnclosingListFrame(nsIFrame* aSelectsAreaFrame)
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{
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nsIFrame* frame = aSelectsAreaFrame->GetParent();
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while (frame) {
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if (frame->GetType() == nsGkAtoms::listControlFrame)
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return static_cast<nsListControlFrame*>(frame);
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frame = frame->GetParent();
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}
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return nsnull;
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}
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class nsDisplayListFocus : public nsDisplayItem {
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public:
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nsDisplayListFocus(nsSelectsAreaFrame* aFrame) : nsDisplayItem(aFrame) {
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MOZ_COUNT_CTOR(nsDisplayListFocus);
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}
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#ifdef NS_BUILD_REFCNT_LOGGING
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virtual ~nsDisplayListFocus() {
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MOZ_COUNT_DTOR(nsDisplayListFocus);
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}
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#endif
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virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder) {
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// override bounds because the list item focus ring may extend outside
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// the nsSelectsAreaFrame
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nsListControlFrame* listFrame = GetEnclosingListFrame(GetUnderlyingFrame());
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return listFrame->GetOverflowRect() + aBuilder->ToReferenceFrame(listFrame);
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}
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virtual void Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx,
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const nsRect& aDirtyRect) {
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nsListControlFrame* listFrame = GetEnclosingListFrame(GetUnderlyingFrame());
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// listFrame must be non-null or we wouldn't get called.
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listFrame->PaintFocus(*aCtx, aBuilder->ToReferenceFrame(listFrame));
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}
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NS_DISPLAY_DECL_NAME("ListFocus")
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};
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NS_IMETHODIMP
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nsSelectsAreaFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists)
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{
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if (!aBuilder->IsForEventDelivery())
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return BuildDisplayListInternal(aBuilder, aDirtyRect, aLists);
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nsDisplayListCollection set;
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nsresult rv = BuildDisplayListInternal(aBuilder, aDirtyRect, set);
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NS_ENSURE_SUCCESS(rv, rv);
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nsOptionEventGrabberWrapper wrapper;
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return wrapper.WrapLists(aBuilder, this, set, aLists);
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}
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nsresult
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nsSelectsAreaFrame::BuildDisplayListInternal(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists)
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{
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nsresult rv = nsAreaFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
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NS_ENSURE_SUCCESS(rv, rv);
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nsListControlFrame* listFrame = GetEnclosingListFrame(this);
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if (listFrame && listFrame->IsFocused()) {
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// we can't just associate the display item with the list frame,
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// because then the list's scrollframe won't clip it (the scrollframe
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// only clips contained descendants).
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return aLists.Outlines()->AppendNewToTop(new (aBuilder)
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nsDisplayListFocus(this));
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsSelectsAreaFrame::Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus)
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{
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nsListControlFrame* list = GetEnclosingListFrame(this);
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NS_ASSERTION(list,
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"Must have an nsListControlFrame! Frame constructor is "
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"broken");
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PRBool isInDropdownMode = list->IsInDropDownMode();
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// See similar logic in nsListControlFrame::Reflow and
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// nsListControlFrame::ReflowAsDropdown. We need to match it here.
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nscoord oldHeight;
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if (isInDropdownMode) {
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// Store the height now in case it changes during
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// nsAreaFrame::Reflow for some odd reason.
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if (!(GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
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oldHeight = GetSize().height;
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} else {
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oldHeight = NS_UNCONSTRAINEDSIZE;
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}
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}
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nsresult rv = nsAreaFrame::Reflow(aPresContext, aDesiredSize,
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aReflowState, aStatus);
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NS_ENSURE_SUCCESS(rv, rv);
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// Check whether we need to suppress scrolbar updates. We want to do that if
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// we're in a possible first pass and our height of a row has changed.
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if (list->MightNeedSecondPass()) {
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nscoord newHeightOfARow = list->CalcHeightOfARow();
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// We'll need a second pass if our height of a row changed. For
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// comboboxes, we'll also need it if our height changed. If we're going
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// to do a second pass, suppress scrollbar updates for this pass.
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if (newHeightOfARow != mHeightOfARow ||
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(isInDropdownMode && (oldHeight != aDesiredSize.height ||
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oldHeight != GetSize().height))) {
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mHeightOfARow = newHeightOfARow;
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list->SetSuppressScrollbarUpdate(PR_TRUE);
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}
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}
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return rv;
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}
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