gecko-dev/layout/forms/nsSelectsAreaFrame.cpp

268 lines
9.6 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):
* Pierre Phaneuf <pp@ludusdesign.com>
*
* 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 "nsSelectsAreaFrame.h"
#include "nsCOMPtr.h"
#include "nsIDOMHTMLOptionElement.h"
#include "nsIContent.h"
#include "nsListControlFrame.h"
#include "nsDisplayList.h"
nsIFrame*
NS_NewSelectsAreaFrame(nsIPresShell* aShell, nsStyleContext* aContext, PRUint32 aFlags)
{
nsSelectsAreaFrame* it = new (aShell) nsSelectsAreaFrame(aContext);
if (it) {
// We need NS_BLOCK_FLOAT_MGR to ensure that the options inside the select
// aren't expanded by right floats outside the select.
it->SetFlags(aFlags | NS_BLOCK_FLOAT_MGR);
}
return it;
}
NS_IMPL_FRAMEARENA_HELPERS(nsSelectsAreaFrame)
//---------------------------------------------------------
PRBool
nsSelectsAreaFrame::IsOptionElement(nsIContent* aContent)
{
PRBool result = PR_FALSE;
nsCOMPtr<nsIDOMHTMLOptionElement> optElem;
if (NS_SUCCEEDED(aContent->QueryInterface(NS_GET_IID(nsIDOMHTMLOptionElement),(void**) getter_AddRefs(optElem)))) {
if (optElem != nsnull) {
result = PR_TRUE;
}
}
return result;
}
//---------------------------------------------------------
PRBool
nsSelectsAreaFrame::IsOptionElementFrame(nsIFrame *aFrame)
{
nsIContent *content = aFrame->GetContent();
if (content) {
return IsOptionElement(content);
}
return PR_FALSE;
}
/**
* This wrapper class lets us redirect mouse hits from the child frame of
* an option element to the element's own frame.
* REVIEW: This is what nsSelectsAreaFrame::GetFrameForPoint used to do
*/
class nsDisplayOptionEventGrabber : public nsDisplayWrapList {
public:
nsDisplayOptionEventGrabber(nsIFrame* aFrame, nsDisplayItem* aItem)
: nsDisplayWrapList(aFrame, aItem) {}
nsDisplayOptionEventGrabber(nsIFrame* aFrame, nsDisplayList* aList)
: nsDisplayWrapList(aFrame, aList) {}
virtual nsIFrame* HitTest(nsDisplayListBuilder* aBuilder, nsPoint aPt,
HitTestState* aState);
NS_DISPLAY_DECL_NAME("OptionEventGrabber")
virtual nsDisplayWrapList* WrapWithClone(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem);
};
nsIFrame* nsDisplayOptionEventGrabber::HitTest(nsDisplayListBuilder* aBuilder,
nsPoint aPt, HitTestState* aState)
{
nsIFrame* frame = mList.HitTest(aBuilder, aPt, aState);
if (frame) {
nsIFrame* selectedFrame = frame;
while (selectedFrame &&
!nsSelectsAreaFrame::IsOptionElementFrame(selectedFrame)) {
selectedFrame = selectedFrame->GetParent();
}
if (selectedFrame) {
return selectedFrame;
}
// else, keep the original result, which could be this frame
}
return frame;
}
nsDisplayWrapList* nsDisplayOptionEventGrabber::WrapWithClone(
nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) {
return new (aBuilder) nsDisplayOptionEventGrabber(aItem->GetUnderlyingFrame(), aItem);
}
class nsOptionEventGrabberWrapper : public nsDisplayWrapper
{
public:
nsOptionEventGrabberWrapper() {}
virtual nsDisplayItem* WrapList(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList) {
// We can't specify the underlying frame here. We need this list to be
// exploded if sorted.
return new (aBuilder) nsDisplayOptionEventGrabber(nsnull, aList);
}
virtual nsDisplayItem* WrapItem(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem) {
return new (aBuilder) nsDisplayOptionEventGrabber(aItem->GetUnderlyingFrame(), aItem);
}
};
static nsListControlFrame* GetEnclosingListFrame(nsIFrame* aSelectsAreaFrame)
{
nsIFrame* frame = aSelectsAreaFrame->GetParent();
while (frame) {
if (frame->GetType() == nsGkAtoms::listControlFrame)
return static_cast<nsListControlFrame*>(frame);
frame = frame->GetParent();
}
return nsnull;
}
class nsDisplayListFocus : public nsDisplayItem {
public:
nsDisplayListFocus(nsSelectsAreaFrame* aFrame) : nsDisplayItem(aFrame) {
MOZ_COUNT_CTOR(nsDisplayListFocus);
}
#ifdef NS_BUILD_REFCNT_LOGGING
virtual ~nsDisplayListFocus() {
MOZ_COUNT_DTOR(nsDisplayListFocus);
}
#endif
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder) {
// override bounds because the list item focus ring may extend outside
// the nsSelectsAreaFrame
nsListControlFrame* listFrame = GetEnclosingListFrame(GetUnderlyingFrame());
return listFrame->GetOverflowRect() + aBuilder->ToReferenceFrame(listFrame);
}
virtual void Paint(nsDisplayListBuilder* aBuilder,
nsIRenderingContext* aCtx) {
nsListControlFrame* listFrame = GetEnclosingListFrame(GetUnderlyingFrame());
// listFrame must be non-null or we wouldn't get called.
listFrame->PaintFocus(*aCtx, aBuilder->ToReferenceFrame(listFrame));
}
NS_DISPLAY_DECL_NAME("ListFocus")
};
NS_IMETHODIMP
nsSelectsAreaFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
if (!aBuilder->IsForEventDelivery())
return BuildDisplayListInternal(aBuilder, aDirtyRect, aLists);
nsDisplayListCollection set;
nsresult rv = BuildDisplayListInternal(aBuilder, aDirtyRect, set);
NS_ENSURE_SUCCESS(rv, rv);
nsOptionEventGrabberWrapper wrapper;
return wrapper.WrapLists(aBuilder, this, set, aLists);
}
nsresult
nsSelectsAreaFrame::BuildDisplayListInternal(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
nsresult rv = nsBlockFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
NS_ENSURE_SUCCESS(rv, rv);
nsListControlFrame* listFrame = GetEnclosingListFrame(this);
if (listFrame && listFrame->IsFocused()) {
// we can't just associate the display item with the list frame,
// because then the list's scrollframe won't clip it (the scrollframe
// only clips contained descendants).
return aLists.Outlines()->AppendNewToTop(new (aBuilder)
nsDisplayListFocus(this));
}
return NS_OK;
}
NS_IMETHODIMP
nsSelectsAreaFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
nsListControlFrame* list = GetEnclosingListFrame(this);
NS_ASSERTION(list,
"Must have an nsListControlFrame! Frame constructor is "
"broken");
PRBool isInDropdownMode = list->IsInDropDownMode();
// See similar logic in nsListControlFrame::Reflow and
// nsListControlFrame::ReflowAsDropdown. We need to match it here.
nscoord oldHeight;
if (isInDropdownMode) {
// Store the height now in case it changes during
// nsBlockFrame::Reflow for some odd reason.
if (!(GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
oldHeight = GetSize().height;
} else {
oldHeight = NS_UNCONSTRAINEDSIZE;
}
}
nsresult rv = nsBlockFrame::Reflow(aPresContext, aDesiredSize,
aReflowState, aStatus);
NS_ENSURE_SUCCESS(rv, rv);
// Check whether we need to suppress scrolbar updates. We want to do that if
// we're in a possible first pass and our height of a row has changed.
if (list->MightNeedSecondPass()) {
nscoord newHeightOfARow = list->CalcHeightOfARow();
// We'll need a second pass if our height of a row changed. For
// comboboxes, we'll also need it if our height changed. If we're going
// to do a second pass, suppress scrollbar updates for this pass.
if (newHeightOfARow != mHeightOfARow ||
(isInDropdownMode && (oldHeight != aDesiredSize.height ||
oldHeight != GetSize().height))) {
mHeightOfARow = newHeightOfARow;
list->SetSuppressScrollbarUpdate(PR_TRUE);
}
}
return rv;
}