gecko-dev/layout/forms/nsHTMLButtonControlFrame.cpp

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/* -*- 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
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* ***** END LICENSE BLOCK ***** */
#include "nsHTMLButtonControlFrame.h"
#include "nsCOMPtr.h"
#include "nsHTMLContainerFrame.h"
#include "nsIFormControlFrame.h"
#include "nsHTMLParts.h"
#include "nsIFormControl.h"
#include "nsIRenderingContext.h"
#include "nsPresContext.h"
#include "nsIPresShell.h"
#include "nsStyleContext.h"
#include "nsLeafFrame.h"
#include "nsCSSRendering.h"
#include "nsISupports.h"
#include "nsGkAtoms.h"
#include "nsCSSAnonBoxes.h"
#include "nsStyleConsts.h"
#include "nsIComponentManager.h"
#include "nsIDocument.h"
#include "nsButtonFrameRenderer.h"
#include "nsFormControlFrame.h"
#include "nsFrameManager.h"
#include "nsINameSpaceManager.h"
#include "nsIServiceManager.h"
#include "nsIDOMHTMLButtonElement.h"
#include "nsIDOMHTMLInputElement.h"
#include "nsStyleSet.h"
#ifdef ACCESSIBILITY
#include "nsIAccessibilityService.h"
#endif
#include "nsDisplayList.h"
nsIFrame*
NS_NewHTMLButtonControlFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsHTMLButtonControlFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsHTMLButtonControlFrame)
nsHTMLButtonControlFrame::nsHTMLButtonControlFrame(nsStyleContext* aContext)
: nsHTMLContainerFrame(aContext)
{
}
nsHTMLButtonControlFrame::~nsHTMLButtonControlFrame()
{
}
void
nsHTMLButtonControlFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
nsFormControlFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), PR_FALSE);
nsHTMLContainerFrame::DestroyFrom(aDestructRoot);
}
NS_IMETHODIMP
nsHTMLButtonControlFrame::Init(
nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsresult rv = nsHTMLContainerFrame::Init(aContent, aParent, aPrevInFlow);
if (NS_SUCCEEDED(rv)) {
mRenderer.SetFrame(this, PresContext());
}
return rv;
}
NS_QUERYFRAME_HEAD(nsHTMLButtonControlFrame)
NS_QUERYFRAME_ENTRY(nsIFormControlFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsHTMLContainerFrame)
#ifdef ACCESSIBILITY
already_AddRefed<nsAccessible>
nsHTMLButtonControlFrame::CreateAccessible()
{
nsCOMPtr<nsIAccessibilityService> accService = do_GetService("@mozilla.org/accessibilityService;1");
if (accService) {
return IsInput() ?
accService->CreateHTMLButtonAccessible(mContent, PresContext()->PresShell()) :
accService->CreateHTML4ButtonAccessible(mContent, PresContext()->PresShell());
}
return nsnull;
}
#endif
nsIAtom*
nsHTMLButtonControlFrame::GetType() const
{
return nsGkAtoms::HTMLButtonControlFrame;
}
void
nsHTMLButtonControlFrame::SetFocus(PRBool aOn, PRBool aRepaint)
{
}
NS_IMETHODIMP
nsHTMLButtonControlFrame::HandleEvent(nsPresContext* aPresContext,
nsGUIEvent* aEvent,
nsEventStatus* aEventStatus)
{
// if disabled do nothing
if (mRenderer.isDisabled()) {
return NS_OK;
}
// mouse clicks are handled by content
// we don't want our children to get any events. So just pass it to frame.
return nsFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
}
NS_IMETHODIMP
nsHTMLButtonControlFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
nsDisplayList onTop;
if (IsVisibleForPainting(aBuilder)) {
nsresult rv = mRenderer.DisplayButton(aBuilder, aLists.BorderBackground(), &onTop);
NS_ENSURE_SUCCESS(rv, rv);
}
nsDisplayListCollection set;
// Do not allow the child subtree to receive events.
if (!aBuilder->IsForEventDelivery()) {
nsresult rv =
BuildDisplayListForChild(aBuilder, mFrames.FirstChild(), aDirtyRect, set,
DISPLAY_CHILD_FORCE_PSEUDO_STACKING_CONTEXT);
NS_ENSURE_SUCCESS(rv, rv);
// That should put the display items in set.Content()
}
// Put the foreground outline and focus rects on top of the children
set.Content()->AppendToTop(&onTop);
// clips to our padding box for <input>s but not <button>s, unless
// they have non-visible overflow..
if (IsInput() || GetStyleDisplay()->mOverflowX != NS_STYLE_OVERFLOW_VISIBLE) {
nsMargin border = GetStyleBorder()->GetActualBorder();
nsRect rect(aBuilder->ToReferenceFrame(this), GetSize());
rect.Deflate(border);
nscoord radii[8];
GetPaddingBoxBorderRadii(radii);
nsresult rv = OverflowClip(aBuilder, set, aLists, rect, radii);
NS_ENSURE_SUCCESS(rv, rv);
} else {
set.MoveTo(aLists);
}
nsresult rv = DisplayOutline(aBuilder, aLists);
NS_ENSURE_SUCCESS(rv, rv);
// to draw border when selected in editor
return DisplaySelectionOverlay(aBuilder, aLists.Content());
}
nscoord
nsHTMLButtonControlFrame::GetMinWidth(nsIRenderingContext* aRenderingContext)
{
nscoord result;
DISPLAY_MIN_WIDTH(this, result);
nsIFrame* kid = mFrames.FirstChild();
result = nsLayoutUtils::IntrinsicForContainer(aRenderingContext,
kid,
nsLayoutUtils::MIN_WIDTH);
result += mRenderer.GetAddedButtonBorderAndPadding().LeftRight();
return result;
}
nscoord
nsHTMLButtonControlFrame::GetPrefWidth(nsIRenderingContext* aRenderingContext)
{
nscoord result;
DISPLAY_PREF_WIDTH(this, result);
nsIFrame* kid = mFrames.FirstChild();
result = nsLayoutUtils::IntrinsicForContainer(aRenderingContext,
kid,
nsLayoutUtils::PREF_WIDTH);
result += mRenderer.GetAddedButtonBorderAndPadding().LeftRight();
return result;
}
NS_IMETHODIMP
nsHTMLButtonControlFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsHTMLButtonControlFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
NS_PRECONDITION(aReflowState.ComputedWidth() != NS_INTRINSICSIZE,
"Should have real computed width by now");
if (mState & NS_FRAME_FIRST_REFLOW) {
nsFormControlFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), PR_TRUE);
}
// Reflow the child
nsIFrame* firstKid = mFrames.FirstChild();
// XXXbz Eventually we may want to check-and-bail if
// !aReflowState.ShouldReflowAllKids() &&
// !NS_SUBTREE_DIRTY(firstKid).
// We'd need to cache our ascent for that, of course.
nsMargin focusPadding = mRenderer.GetAddedButtonBorderAndPadding();
// Reflow the contents of the button.
ReflowButtonContents(aPresContext, aDesiredSize, aReflowState, firstKid,
focusPadding, aStatus);
aDesiredSize.width = aReflowState.ComputedWidth();
// If computed use the computed value.
if (aReflowState.ComputedHeight() != NS_INTRINSICSIZE)
aDesiredSize.height = aReflowState.ComputedHeight();
else
aDesiredSize.height += focusPadding.TopBottom();
aDesiredSize.width += aReflowState.mComputedBorderPadding.LeftRight();
aDesiredSize.height += aReflowState.mComputedBorderPadding.TopBottom();
// Make sure we obey min/max-height. Note that we do this after adjusting
// for borderpadding, since buttons have border-box sizing...
// XXXbz unless someone overrides that, of course! We should really consider
// exposing nsHTMLReflowState::AdjustComputed* or something.
aDesiredSize.height = NS_CSS_MINMAX(aDesiredSize.height,
aReflowState.mComputedMinHeight,
aReflowState.mComputedMaxHeight);
aDesiredSize.ascent +=
aReflowState.mComputedBorderPadding.top + focusPadding.top;
aDesiredSize.mOverflowArea =
nsRect(0, 0, aDesiredSize.width, aDesiredSize.height);
ConsiderChildOverflow(aDesiredSize.mOverflowArea, firstKid);
FinishAndStoreOverflow(&aDesiredSize);
aStatus = NS_FRAME_COMPLETE;
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
return NS_OK;
}
void
nsHTMLButtonControlFrame::ReflowButtonContents(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsIFrame* aFirstKid,
nsMargin aFocusPadding,
nsReflowStatus& aStatus)
{
nsSize availSize(aReflowState.ComputedWidth(), NS_INTRINSICSIZE);
// Indent the child inside us by the focus border. We must do this separate
// from the regular border.
availSize.width -= aFocusPadding.LeftRight();
// See whether out availSize's width is big enough. If it's smaller than our
// intrinsic min width, that means that the kid wouldn't really fit; for a
// better look in such cases we adjust the available width and our left
// offset to allow the kid to spill left into our padding.
nscoord xoffset = aFocusPadding.left + aReflowState.mComputedBorderPadding.left;
nscoord extrawidth = GetMinWidth(aReflowState.rendContext) -
aReflowState.ComputedWidth();
if (extrawidth > 0) {
nscoord extraleft = extrawidth / 2;
nscoord extraright = extrawidth - extraleft;
NS_ASSERTION(extraright >=0, "How'd that happen?");
// Do not allow the extras to be bigger than the relevant padding
extraleft = NS_MIN(extraleft, aReflowState.mComputedPadding.left);
extraright = NS_MIN(extraright, aReflowState.mComputedPadding.right);
xoffset -= extraleft;
availSize.width += extraleft + extraright;
}
availSize.width = NS_MAX(availSize.width,0);
nsHTMLReflowState reflowState(aPresContext, aReflowState, aFirstKid,
availSize);
ReflowChild(aFirstKid, aPresContext, aDesiredSize, reflowState,
xoffset,
aFocusPadding.top + aReflowState.mComputedBorderPadding.top,
0, aStatus);
// calculate the min internal height so the contents gets centered correctly.
// XXXbz this assumes border-box sizing.
nscoord minInternalHeight = aReflowState.mComputedMinHeight -
aReflowState.mComputedBorderPadding.TopBottom();
minInternalHeight = NS_MAX(minInternalHeight, 0);
// center child vertically
nscoord yoff = 0;
if (aReflowState.ComputedHeight() != NS_INTRINSICSIZE) {
yoff = (aReflowState.ComputedHeight() - aDesiredSize.height)/2;
if (yoff < 0) {
yoff = 0;
}
} else if (aDesiredSize.height < minInternalHeight) {
yoff = (minInternalHeight - aDesiredSize.height) / 2;
}
// Place the child
FinishReflowChild(aFirstKid, aPresContext, &reflowState, aDesiredSize,
xoffset,
yoff + aFocusPadding.top + aReflowState.mComputedBorderPadding.top, 0);
if (aDesiredSize.ascent == nsHTMLReflowMetrics::ASK_FOR_BASELINE)
aDesiredSize.ascent = aFirstKid->GetBaseline();
// Adjust the baseline by our offset (since we moved the child's
// baseline by that much).
aDesiredSize.ascent += yoff;
}
/* virtual */ PRBool
nsHTMLButtonControlFrame::IsContainingBlock() const
{
return PR_TRUE;
}
PRIntn
nsHTMLButtonControlFrame::GetSkipSides() const
{
return 0;
}
nsresult nsHTMLButtonControlFrame::SetFormProperty(nsIAtom* aName, const nsAString& aValue)
{
if (nsGkAtoms::value == aName) {
return mContent->SetAttr(kNameSpaceID_None, nsGkAtoms::value,
aValue, PR_TRUE);
}
return NS_OK;
}
nsresult nsHTMLButtonControlFrame::GetFormProperty(nsIAtom* aName, nsAString& aValue) const
{
if (nsGkAtoms::value == aName)
mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::value, aValue);
return NS_OK;
}
nsStyleContext*
nsHTMLButtonControlFrame::GetAdditionalStyleContext(PRInt32 aIndex) const
{
return mRenderer.GetStyleContext(aIndex);
}
void
nsHTMLButtonControlFrame::SetAdditionalStyleContext(PRInt32 aIndex,
nsStyleContext* aStyleContext)
{
mRenderer.SetStyleContext(aIndex, aStyleContext);
}
NS_IMETHODIMP
nsHTMLButtonControlFrame::AppendFrames(nsIAtom* aListName,
nsFrameList& aFrameList)
{
NS_NOTREACHED("unsupported operation");
return NS_ERROR_UNEXPECTED;
}
NS_IMETHODIMP
nsHTMLButtonControlFrame::InsertFrames(nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList)
{
NS_NOTREACHED("unsupported operation");
return NS_ERROR_UNEXPECTED;
}
NS_IMETHODIMP
nsHTMLButtonControlFrame::RemoveFrame(nsIAtom* aListName,
nsIFrame* aOldFrame)
{
NS_NOTREACHED("unsupported operation");
return NS_ERROR_UNEXPECTED;
}