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gecko-dev/layout/generic/nsBulletFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (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/NPL/
*
* 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 Communicator client code.
*
* The Initial Developer of the Original Code is Netscape Communications
* Corporation. Portions created by Netscape are Copyright (C) 1998
* Netscape Communications Corporation. All Rights Reserved.
*/
#include "nsBulletFrame.h"
#include "nsHTMLAtoms.h"
#include "nsHTMLIIDs.h"
#include "nsHTMLParts.h"
#include "nsHTMLValue.h"
#include "nsHTMLContainerFrame.h"
#include "nsIFontMetrics.h"
#include "nsIHTMLContent.h"
#include "nsIPresContext.h"
#include "nsIPresShell.h"
#include "nsIReflowCommand.h"
#include "nsIRenderingContext.h"
#include "prprf.h"
nsBulletFrame::nsBulletFrame()
{
}
nsBulletFrame::~nsBulletFrame()
{
}
NS_IMETHODIMP
nsBulletFrame::DeleteFrame(nsIPresContext& aPresContext)
{
// Release image loader first so that its refcnt can go to zero
mImageLoader.DestroyLoader();
return nsFrame::DeleteFrame(aPresContext);
}
NS_IMETHODIMP
nsBulletFrame::GetFrameName(nsString& aResult) const
{
return MakeFrameName("Bullet", aResult);
}
NS_IMETHODIMP
nsBulletFrame::List(FILE* out, PRInt32 aIndent, nsIListFilter *aFilter) const
{
PRInt32 i;
for (i = aIndent; --i >= 0; ) fputs(" ", out);
fprintf(out, "Bullet(%d)@%p ", ContentIndexInContainer(this), this);
nsIView* view;
GetView(view);
if (nsnull != view) {
fprintf(out, " [view=%p]", view);
}
out << mRect;
if (0 != mState) {
fprintf(out, " [state=%08x]", mState);
}
fputs("<>\n", out);
return NS_OK;
}
NS_METHOD
nsBulletFrame::Paint(nsIPresContext& aCX,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect)
{
const nsStyleDisplay* disp =
(const nsStyleDisplay*)mStyleContext->GetStyleData(eStyleStruct_Display);
nscoord width;
if (disp->mVisible) {
const nsStyleList* myList =
(const nsStyleList*)mStyleContext->GetStyleData(eStyleStruct_List);
if (myList->mListStyleImage.Length() > 0) {
nsIImage* image = mImageLoader.GetImage();
if (nsnull == image) {
if (!mImageLoader.GetLoadImageFailed()) {
// No image yet
return NS_OK;
}
}
else {
nsRect innerArea(mPadding.left, mPadding.top,
mRect.width - (mPadding.left + mPadding.right),
mRect.height - (mPadding.top + mPadding.bottom));
aRenderingContext.DrawImage(image, innerArea);
return NS_OK;
}
}
const nsStyleFont* myFont =
(const nsStyleFont*)mStyleContext->GetStyleData(eStyleStruct_Font);
const nsStyleColor* myColor =
(const nsStyleColor*)mStyleContext->GetStyleData(eStyleStruct_Color);
nsIFontMetrics* fm;
aRenderingContext.SetColor(myColor->mColor);
nsAutoString text;
switch (myList->mListStyleType) {
case NS_STYLE_LIST_STYLE_NONE:
break;
default:
case NS_STYLE_LIST_STYLE_BASIC:
case NS_STYLE_LIST_STYLE_DISC:
aRenderingContext.FillEllipse(mPadding.left, mPadding.top,
mRect.width - (mPadding.left + mPadding.right),
mRect.height - (mPadding.top + mPadding.bottom));
break;
case NS_STYLE_LIST_STYLE_CIRCLE:
aRenderingContext.DrawEllipse(mPadding.left, mPadding.top,
mRect.width - (mPadding.left + mPadding.right),
mRect.height - (mPadding.top + mPadding.bottom));
break;
case NS_STYLE_LIST_STYLE_SQUARE:
aRenderingContext.FillRect(mPadding.left, mPadding.top,
mRect.width - (mPadding.left + mPadding.right),
mRect.height - (mPadding.top + mPadding.bottom));
break;
case NS_STYLE_LIST_STYLE_DECIMAL:
case NS_STYLE_LIST_STYLE_LOWER_ROMAN:
case NS_STYLE_LIST_STYLE_UPPER_ROMAN:
case NS_STYLE_LIST_STYLE_LOWER_ALPHA:
case NS_STYLE_LIST_STYLE_UPPER_ALPHA:
fm = aCX.GetMetricsFor(myFont->mFont);
GetListItemText(aCX, *myList, text);
aRenderingContext.SetFont(fm);
aRenderingContext.GetWidth(text, width);
aRenderingContext.DrawString(text, mPadding.left, mPadding.top, width);
NS_RELEASE(fm);
break;
}
}
return NS_OK;
}
PRInt32
nsBulletFrame::SetListItemOrdinal(PRInt32 aNextOrdinal)
{
// Assume that the ordinal comes from the block reflow state
mOrdinal = aNextOrdinal;
// Try to get value directly from the list-item, if it specifies a
// value attribute. Note: we do this with our parent's content
// because our parent is the list-item.
nsHTMLValue value;
nsIContent* parentContent;
mContentParent->GetContent(parentContent);
nsIHTMLContent* hc;
if (NS_OK == parentContent->QueryInterface(kIHTMLContentIID, (void**) &hc)) {
if (NS_CONTENT_ATTR_HAS_VALUE ==
hc->GetAttribute(nsHTMLAtoms::value, value)) {
if (eHTMLUnit_Integer == value.GetUnit()) {
// Use ordinal specified by the value attribute
mOrdinal = value.GetIntValue();
if (mOrdinal <= 0) {
mOrdinal = 1;
}
}
}
NS_RELEASE(hc);
}
NS_RELEASE(parentContent);
return mOrdinal + 1;
}
static const char* gLowerRomanCharsA = "ixcm";
static const char* gUpperRomanCharsA = "IXCM";
static const char* gLowerRomanCharsB = "vld?";
static const char* gUpperRomanCharsB = "VLD?";
static const char* gLowerAlphaChars = "abcdefghijklmnopqrstuvwxyz";
static const char* gUpperAlphaChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
// XXX change roman/alpha to use unsigned math so that maxint and
// maxnegint will work
void
nsBulletFrame::GetListItemText(nsIPresContext& aCX,
const nsStyleList& aListStyle,
nsString& result)
{
PRInt32 ordinal = mOrdinal;
char cbuf[40];
switch (aListStyle.mListStyleType) {
case NS_STYLE_LIST_STYLE_DECIMAL:
PR_snprintf(cbuf, sizeof(cbuf), "%ld", ordinal);
result.Append(cbuf);
break;
case NS_STYLE_LIST_STYLE_LOWER_ROMAN:
case NS_STYLE_LIST_STYLE_UPPER_ROMAN:
{
if (ordinal <= 0) {
ordinal = 1;
}
nsAutoString addOn, decStr;
decStr.Append(ordinal, 10);
PRIntn len = decStr.Length();
const PRUnichar* dp = decStr.GetUnicode();
const PRUnichar* end = dp + len;
PRIntn romanPos = len;
PRIntn n;
const char* achars;
const char* bchars;
if (aListStyle.mListStyleType == NS_STYLE_LIST_STYLE_LOWER_ROMAN) {
achars = gLowerRomanCharsA;
bchars = gLowerRomanCharsB;
}
else {
achars = gUpperRomanCharsA;
bchars = gUpperRomanCharsB;
}
for (; dp < end; dp++) {
romanPos--;
addOn.SetLength(0);
switch(*dp) {
case '3': addOn.Append(achars[romanPos]);
case '2': addOn.Append(achars[romanPos]);
case '1': addOn.Append(achars[romanPos]);
break;
case '4':
addOn.Append(achars[romanPos]);
// FALLTHROUGH
case '5': case '6':
case '7': case '8':
addOn.Append(bchars[romanPos]);
for(n=0;n<(*dp-'5');n++) {
addOn.Append(achars[romanPos]);
}
break;
case '9':
addOn.Append(achars[romanPos]);
addOn.Append(achars[romanPos+1]);
break;
default:
break;
}
result.Append(addOn);
}
}
break;
case NS_STYLE_LIST_STYLE_LOWER_ALPHA:
case NS_STYLE_LIST_STYLE_UPPER_ALPHA:
{
PRInt32 anOffset = -1;
PRInt32 aBase = 26;
PRInt32 ndex=0;
PRInt32 root=1;
PRInt32 next=aBase;
PRInt32 expn=1;
const char* chars =
(aListStyle.mListStyleType == NS_STYLE_LIST_STYLE_LOWER_ALPHA)
? gLowerAlphaChars : gUpperAlphaChars;
// must be positive here...
if (ordinal <= 0) {
ordinal = 1;
}
ordinal--; // a == 0
// scale up in baseN; exceed current value.
while (next<=ordinal) {
root=next;
next*=aBase;
expn++;
}
while (0!=(expn--)) {
ndex = ((root<=ordinal) && (0!=root)) ? (ordinal/root): 0;
ordinal %= root;
if (root>1)
result.Append(chars[ndex+anOffset]);
else
result.Append(chars[ndex]);
root /= aBase;
}
}
break;
}
result.Append(".");
}
#define MIN_BULLET_SIZE 5 // from laytext.c
static nsresult
UpdateBulletCB(nsIPresContext& aPresContext, nsIFrame* aFrame, PRIntn aStatus)
{
nsresult rv = NS_OK;
if (NS_IMAGE_LOAD_STATUS_SIZE_AVAILABLE & aStatus) {
// Now that the size is available, trigger a reflow of the bullet
// frame.
nsIPresShell* shell;
shell = aPresContext.GetShell();
if (nsnull != shell) {
nsIReflowCommand* cmd;
rv = NS_NewHTMLReflowCommand(&cmd, aFrame,
nsIReflowCommand::ContentChanged);
if (NS_OK == rv) {
shell->EnterReflowLock();
shell->AppendReflowCommand(cmd);
NS_RELEASE(cmd);
shell->ExitReflowLock();
}
NS_RELEASE(shell);
}
}
return rv;
}
void
nsBulletFrame::GetDesiredSize(nsIPresContext* aCX,
const nsHTMLReflowState& aReflowState,
nsHTMLReflowMetrics& aMetrics)
{
const nsStyleList* myList =
(const nsStyleList*)mStyleContext->GetStyleData(eStyleStruct_List);
nscoord ascent;
if (myList->mListStyleImage.Length() > 0) {
mImageLoader.SetURL(myList->mListStyleImage);
mImageLoader.GetDesiredSize(aCX, aReflowState, this, UpdateBulletCB,
aMetrics);
if (!mImageLoader.GetLoadImageFailed()) {
nsHTMLContainerFrame::CreateViewForFrame(*aCX, this, mStyleContext,
PR_FALSE);
aMetrics.ascent = aMetrics.height;
aMetrics.descent = 0;
return;
}
}
const nsStyleFont* myFont =
(const nsStyleFont*)mStyleContext->GetStyleData(eStyleStruct_Font);
nsIFontMetrics* fm = aCX->GetMetricsFor(myFont->mFont);
nscoord bulletSize;
float p2t;
float t2p;
nsAutoString text;
switch (myList->mListStyleType) {
case NS_STYLE_LIST_STYLE_NONE:
aMetrics.width = 0;
aMetrics.height = 0;
aMetrics.ascent = 0;
aMetrics.descent = 0;
break;
default:
case NS_STYLE_LIST_STYLE_DISC:
case NS_STYLE_LIST_STYLE_CIRCLE:
case NS_STYLE_LIST_STYLE_BASIC:
case NS_STYLE_LIST_STYLE_SQUARE:
t2p = aCX->GetTwipsToPixels();
fm->GetMaxAscent(ascent);
bulletSize = NSTwipsToIntPixels(
(nscoord)NSToIntRound(0.8f * (float(ascent) / 2.0f)), t2p);
if (bulletSize < 1) {
bulletSize = MIN_BULLET_SIZE;
}
p2t = aCX->GetPixelsToTwips();
bulletSize = NSIntPixelsToTwips(bulletSize, p2t);
mPadding.bottom = ascent / 8;
aMetrics.width = mPadding.right + bulletSize;
aMetrics.height = mPadding.bottom + bulletSize;
aMetrics.ascent = mPadding.bottom + bulletSize;
aMetrics.descent = 0;
break;
case NS_STYLE_LIST_STYLE_DECIMAL:
case NS_STYLE_LIST_STYLE_LOWER_ROMAN:
case NS_STYLE_LIST_STYLE_UPPER_ROMAN:
case NS_STYLE_LIST_STYLE_LOWER_ALPHA:
case NS_STYLE_LIST_STYLE_UPPER_ALPHA:
GetListItemText(*aCX, *myList, text);
fm->GetHeight(aMetrics.height);
aReflowState.rendContext->SetFont(fm);
aReflowState.rendContext->GetWidth(text, aMetrics.width);
aMetrics.width += mPadding.right;
fm->GetMaxAscent(aMetrics.ascent);
fm->GetMaxDescent(aMetrics.descent);
break;
}
NS_RELEASE(fm);
}
NS_IMETHODIMP
nsBulletFrame::Reflow(nsIPresContext& aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
// Get the base size
GetDesiredSize(&aPresContext, aReflowState, aMetrics);
// Add in the border and padding; split the top/bottom between the
// ascent and descent to make things look nice
const nsStyleSpacing* space =(const nsStyleSpacing*)
mStyleContext->GetStyleData(eStyleStruct_Spacing);
nsMargin borderPadding;
nsHTMLReflowState::ComputeBorderPaddingFor(this,
aReflowState.parentReflowState,
borderPadding);
aMetrics.width += borderPadding.left + borderPadding.right;
aMetrics.height += borderPadding.top + borderPadding.bottom;
aMetrics.ascent += borderPadding.top;
aMetrics.descent += borderPadding.bottom;
if (nsnull != aMetrics.maxElementSize) {
aMetrics.maxElementSize->width = aMetrics.width;
aMetrics.maxElementSize->height = aMetrics.height;
}
aStatus = NS_FRAME_COMPLETE;
return NS_OK;
}
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