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pjs/layout/generic/nsTextFrame.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 "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "nsHTMLParts.h"
#include "nsCRT.h"
#include "nsSplittableFrame.h"
#include "nsLineLayout.h"
#include "nsString.h"
#include "nsIPresContext.h"
#include "nsStyleConsts.h"
#include "nsIStyleContext.h"
#include "nsCoord.h"
#include "nsIFontMetrics.h"
#include "nsIRenderingContext.h"
#include "nsHTMLIIDs.h"
#include "nsIPresShell.h"
#include "nsIView.h"
#include "nsIViewManager.h"
#include "nsITimerCallback.h"
#include "nsITimer.h"
#include "prtime.h"
#include "nsVoidArray.h"
#include "prprf.h"
#include "nsIDOMText.h"
#include "nsIDocument.h"
#include "nsIDeviceContext.h"
#include "nsXIFConverter.h"
#include "nsITextContent.h"
#include "nsISelection.h"
#include "nsSelectionRange.h"
static NS_DEFINE_IID(kIDOMTextIID, NS_IDOMTEXT_IID);
#ifdef NS_DEBUG
#undef NOISY
#undef NOISY_BLINK
#undef DEBUG_WORD_WRAPPING
#else
#undef NOISY
#undef NOISY_BLINK
#undef DEBUG_WORD_WRAPPING
#endif
// XXX TODO:
// 0. re-implement justified text
// 1. add in a rendering method that can render justified text
// 2. text renderer should negotiate with rendering context/font
// metrics to see what it can handle; for example, if the renderer can
// automatically deal with underlining, strikethrough, justification,
// etc, then the text renderer should let the rc do the work;
// otherwise there should be XP fallback code here.
// XXX TODO:
// implement nsIFrame::Reflow
// XXX Speedup ideas
// 1. justified text can use word width information during resize reflows
// 2. when we are doing an unconstrained reflow we know we are going to
// get reflowed again; collect up the word widths we are computing as we
// do this and then save them in the mWords; later on when we get reflowed
// again we can destroy them
// 3. when pulling up text get word width information from next-in-flow
// XXX temporary
#define XP_IS_SPACE(_ch) \
(((_ch) == ' ') || ((_ch) == '\t') || ((_ch) == '\n'))
// XXX need more of this in nsIRenderingContext.GetWidth
#define CH_NBSP 160
// XXX use a PreTextFrame for pre-formatted text?
static NS_DEFINE_IID(kITextContentIID, NS_ITEXT_CONTENT_IID);
class TextFrame;
class BlinkTimer : public nsITimerCallback {
public:
BlinkTimer();
~BlinkTimer();
NS_DECL_ISUPPORTS
void AddFrame(TextFrame* aFrame);
PRBool RemoveFrame(TextFrame* aFrame);
PRInt32 FrameCount();
void Start();
void Stop();
virtual void Notify(nsITimer *timer);
nsITimer* mTimer;
nsVoidArray mFrames;
};
class TextFrame : public nsSplittableFrame {
public:
TextFrame(nsIContent* aContent, nsIFrame* aParentFrame);
// nsIFrame
NS_IMETHOD CreateContinuingFrame(nsIPresContext& aPresContext,
nsIFrame* aParent,
nsIStyleContext* aStyleContext,
nsIFrame*& aContinuingFrame);
NS_IMETHOD Paint(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect);
NS_IMETHOD GetCursorAndContentAt(nsIPresContext& aPresContext,
const nsPoint& aPoint,
nsIFrame** aFrame,
nsIContent** aContent,
PRInt32& aCursor);
NS_IMETHOD ContentChanged(nsIPresContext* aPresContext,
nsIContent* aChild,
nsISupports* aSubContent);
NS_IMETHOD List(FILE* out, PRInt32 aIndent) const;
NS_IMETHOD ListTag(FILE* out) const;
NS_IMETHOD GetPosition(nsIPresContext& aCX,
nsIRenderingContext * aRendContext,
nsGUIEvent* aEvent,
nsIFrame * aNewFrame,
PRUint32& aAcutalContentOffset,
PRInt32& aOffset);
// nsIHTMLReflow
NS_IMETHOD FindTextRuns(nsLineLayout& aLineLayout);
NS_IMETHOD Reflow(nsIPresContext& aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
// TextFrame methods
struct SelectionInfo {
PRInt32 mStartOffset;
PRInt32 mEndOffset;
PRBool mEmptySelection;
};
void ComputeSelectionInfo(nsIRenderingContext& aRenderingContext,
nsIDocument* aDocument,
PRInt32* aIndicies, PRInt32 aTextLength,
SelectionInfo& aResult);
PRUnichar* PrepareUnicodeText(nsIRenderingContext& aRenderingContext,
PRInt32* aIndicies,
PRUnichar* aBuffer, PRInt32 aBufSize,
PRInt32& aStrLen,
nscoord& aNewWidth);
char* PrepareAsciiText(nsIRenderingContext& aRenderingContext,
PRInt32* aIndexes,
char* aBuffer, PRInt32 aBufSize,
PRInt32& aStrLen,
nscoord& aDeltaWidthResult);
void PaintTextDecorations(nsIRenderingContext& aRenderingContext,
PRUint8 aDecorations,
nscoord aX, nscoord aY, nscoord aWidth);
void PaintUnicodeText(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
nscolor aTextColor,
PRUint8 aDecorations,
nscolor aSelectionTextColor,
nscolor aSelectionBGColor,
nscoord dx, nscoord dy);
void PaintAsciiText(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
nscolor aTextColor,
PRUint8 aDecorations,
nscolor aSelectionTextColor,
nscolor aSelectionBGColor,
nscoord dx, nscoord dy);
nsReflowStatus ReflowPre(nsLineLayout& aLineLayout,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
const nsStyleFont& aFont,
PRInt32 aStartingOffset);
nsReflowStatus ReflowNormal(nsLineLayout& aLineLayout,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
const nsStyleFont& aFontStyle,
const nsStyleText& aTextStyle,
PRInt32 aStartingOffset);
nscoord ComputeTotalWordWidth(nsLineLayout& aLineLayout,
const nsHTMLReflowState& aReflowState,
nsIFrame* aNextFrame,
nscoord aBaseWidth);
nscoord ComputeWordFragmentWidth(nsLineLayout& aLineLayout,
const nsHTMLReflowState& aReflowState,
nsIFrame* aNextFrame,
nsITextContent* aText,
PRBool& aStop);
protected:
virtual ~TextFrame();
PRInt32 mContentOffset;
PRInt32 mContentLength;
// XXX need a better packing
PRUint32 mFlags;
PRUint32 mColumn;
};
// Flag information used by rendering code. This information is
// computed by the ResizeReflow code. Remaining bits are used by the
// tab count.
#define TEXT_SKIP_LEADING_WS 0x01
#define TEXT_HAS_MULTIBYTE 0x02
#define TEXT_IS_PRE 0x04
#define TEXT_BLINK_ON 0x08
//#define TEXT_ENDS_IN_WHITESPACE 0x10
#define TEXT_GET_TAB_COUNT(_mf) ((_mf) >> 5)
#define TEXT_SET_TAB_COUNT(_mf,_tabs) (_mf) = (_mf) | ((_tabs)<< 5)
//----------------------------------------------------------------------
static PRBool gBlinkTextOff;
static BlinkTimer* gTextBlinker;
#ifdef NOISY_BLINK
static PRTime gLastTick;
#endif
BlinkTimer::BlinkTimer()
{
NS_INIT_REFCNT();
mTimer = nsnull;
}
BlinkTimer::~BlinkTimer()
{
Stop();
}
void BlinkTimer::Start()
{
nsresult rv = NS_NewTimer(&mTimer);
if (NS_OK == rv) {
mTimer->Init(this, 750);
}
}
void BlinkTimer::Stop()
{
if (nsnull != mTimer) {
mTimer->Cancel();
NS_RELEASE(mTimer);
}
}
static NS_DEFINE_IID(kITimerCallbackIID, NS_ITIMERCALLBACK_IID);
NS_IMPL_ISUPPORTS(BlinkTimer, kITimerCallbackIID);
void BlinkTimer::AddFrame(TextFrame* aFrame) {
mFrames.AppendElement(aFrame);
if (1 == mFrames.Count()) {
Start();
}
}
PRBool BlinkTimer::RemoveFrame(TextFrame* aFrame) {
PRBool rv = mFrames.RemoveElement(aFrame);
if (0 == mFrames.Count()) {
Stop();
}
return rv;
}
PRInt32 BlinkTimer::FrameCount() {
return mFrames.Count();
}
void BlinkTimer::Notify(nsITimer *timer)
{
// Toggle blink state bit so that text code knows whether or not to
// render. All text code shares the same flag so that they all blink
// in unison.
gBlinkTextOff = PRBool(!gBlinkTextOff);
// XXX hack to get auto-repeating timers; restart before doing
// expensive work so that time between ticks is more even
Stop();
Start();
#ifdef NOISY_BLINK
PRTime now = PR_Now();
char buf[50];
PRTime delta;
LL_SUB(delta, now, gLastTick);
gLastTick = now;
PR_snprintf(buf, sizeof(buf), "%lldusec", delta);
printf("%s\n", buf);
#endif
PRInt32 i, n = mFrames.Count();
for (i = 0; i < n; i++) {
TextFrame* text = (TextFrame*) mFrames.ElementAt(i);
// Determine damaged area and tell view manager to redraw it
nsPoint offset;
nsRect bounds;
text->GetRect(bounds);
nsIView* view;
text->GetOffsetFromView(offset, view);
nsIViewManager* vm;
view->GetViewManager(vm);
bounds.x = offset.x;
bounds.y = offset.y;
vm->UpdateView(view, bounds, 0);
NS_RELEASE(vm);
}
}
//----------------------------------------------------------------------
nsresult
NS_NewTextFrame(nsIContent* aContent, nsIFrame* aParentFrame,
nsIFrame*& aResult)
{
nsIFrame* frame = new TextFrame(aContent, aParentFrame);
if (nsnull == frame) {
return NS_ERROR_OUT_OF_MEMORY;
}
aResult = frame;
return NS_OK;
}
TextFrame::TextFrame(nsIContent* aContent, nsIFrame* aParentFrame)
: nsSplittableFrame(aContent, aParentFrame)
{
if (nsnull == gTextBlinker) {
// Create text timer the first time out
gTextBlinker = new BlinkTimer();
}
NS_ADDREF(gTextBlinker);
}
TextFrame::~TextFrame()
{
if (0 != (mFlags & TEXT_BLINK_ON)) {
NS_ASSERTION(nsnull != gTextBlinker, "corrupted blinker");
gTextBlinker->RemoveFrame(this);
}
if (0 == gTextBlinker->Release()) {
// Release text timer when the last text frame is gone
gTextBlinker = nsnull;
}
}
NS_IMETHODIMP
TextFrame::GetCursorAndContentAt(nsIPresContext& aPresContext,
const nsPoint& aPoint,
nsIFrame** aFrame,
nsIContent** aContent,
PRInt32& aCursor)
{
*aContent = mContent;
aCursor = NS_STYLE_CURSOR_IBEAM;
return NS_OK;
}
NS_IMETHODIMP
TextFrame::CreateContinuingFrame(nsIPresContext& aCX,
nsIFrame* aParent,
nsIStyleContext* aStyleContext,
nsIFrame*& aContinuingFrame)
{
TextFrame* cf = new TextFrame(mContent, aParent);
if (nsnull == cf) {
return NS_ERROR_OUT_OF_MEMORY;
}
cf->SetStyleContext(&aCX, aStyleContext);
cf->AppendToFlow(this);
aContinuingFrame = cf;
return NS_OK;
}
NS_IMETHODIMP
TextFrame::ContentChanged(nsIPresContext* aPresContext,
nsIContent* aChild,
nsISupports* aSubContent)
{
// Generate a reflow command with this frame as the target frame
nsIReflowCommand* cmd;
nsresult result;
result = NS_NewHTMLReflowCommand(&cmd, this, nsIReflowCommand::ContentChanged);
if (NS_OK == result) {
nsIPresShell* shell = aPresContext->GetShell();
shell->AppendReflowCommand(cmd);
NS_RELEASE(shell);
NS_RELEASE(cmd);
}
return result;
}
NS_IMETHODIMP
TextFrame::Paint(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect)
{
if ((0 != (mFlags & TEXT_BLINK_ON)) && gBlinkTextOff) {
return NS_OK;
}
const nsStyleDisplay* disp =
(const nsStyleDisplay*)mStyleContext->GetStyleData(eStyleStruct_Display);
if (disp->mVisible) {
// Get style data
const nsStyleColor* color =
(const nsStyleColor*)mStyleContext->GetStyleData(eStyleStruct_Color);
const nsStyleFont* font =
(const nsStyleFont*)mStyleContext->GetStyleData(eStyleStruct_Font);
// Set font and color
aRenderingContext.SetColor(color->mColor);
nsFont plainFont(font->mFont);
plainFont.decorations = NS_FONT_DECORATION_NONE;
aRenderingContext.SetFont(plainFont); // don't let the system paint decorations
// XXX Get these from style
nscolor selbg = NS_RGB(0, 0, 0);
nscolor selfg = NS_RGB(255, 255, 255);
// Select rendering method and render
PRUint32 hints = 0;
aRenderingContext.GetHints(hints);
if ((TEXT_HAS_MULTIBYTE & mFlags) ||
(0 == (hints & NS_RENDERING_HINT_FAST_8BIT_TEXT))) {
// Use PRUnichar rendering routine
PaintUnicodeText(aPresContext, aRenderingContext,
color->mColor, font->mFont.decorations, selfg, selbg, 0, 0);
}
else {
// Use char rendering routine
PaintAsciiText(aPresContext, aRenderingContext,
color->mColor, font->mFont.decorations, selfg, selbg, 0, 0);
}
}
return NS_OK;
}
/**
* To keep things efficient we depend on text content implementing
* our nsITextContent API
*/
static const PRUnichar*
GetText(nsIContent* aContent, PRInt32& aLengthResult)
{
const PRUnichar* cp = nsnull;
nsITextContent* tc = nsnull;
nsresult rv = aContent->QueryInterface(kITextContentIID, (void**) &tc);
if ((NS_OK == rv) && (nsnull != tc)) {
tc->GetText(cp, aLengthResult);
NS_RELEASE(tc);
}
return cp;
}
/**
* This method computes the starting and ending offsets of the
* selection for this frame. The results are placed into
* aResult. There are 5 cases that we represent with a starting offset
* (aResult.mStartOffset), ending offset (aResult.mEndOffset) and an
* empty selection flag (aResult.mEmptySelection):
*
* case 1: The selection completely misses this content/frame. In this
* case mStartOffset and mEndOffset will be set to aTextLength and
* mEmptySelection will be false.
*
* case 2: The selection begins somewhere before or at this frame and
* ends somewhere in this frame. In this case mStartOffset will be set
* to 0 and mEndOffset will be set to the end of the selection and
* mEmptySelection will be false.
*
* case 3: The selection begins somewhere in this frame and ends
* somewhere in this frame. In this case mStartOffset and mEndOffset
* are set accordingly and if they happen to be the same value then
* mEmptySelection is set to true (otherwise it is set to false).
*
* case 4: The selection begins somewhere in this frame and ends
* somewhere else. In this case mStartOffset is set to where the
* selection begins and mEndOffset is set to aTextLength and
* mEmptySelection is set to false.
*
* case 5: The selection covers the entire content/frame. In this case
* mStartOffset is set to zero and mEndOffset is set to aTextLength and
* mEmptySelection is set to false.
*/
void
TextFrame::ComputeSelectionInfo(nsIRenderingContext& aRenderingContext,
nsIDocument* aDocument,
PRInt32* aIndicies, PRInt32 aTextLength,
SelectionInfo& aResult)
{
// Assume, for now, that the selection misses this section of
// content completely.
aResult.mStartOffset = aTextLength;
aResult.mEndOffset = aTextLength;
aResult.mEmptySelection = PR_FALSE;
nsISelection * selection;
aDocument->GetSelection(selection);
nsSelectionRange * range = selection->GetRange();
nsSelectionPoint * startPnt = range->GetStartPoint();
nsSelectionPoint * endPnt = range->GetEndPoint();
nsIContent * startContent = startPnt->GetContent();
nsIContent * endContent = endPnt->GetContent();
PRInt32 startOffset = startPnt->GetOffset() - mContentOffset;
PRInt32 endOffset = endPnt->GetOffset() - mContentOffset;
// Check for the case that requires up to 3 sections first. This
// case also handles the empty selection.
if ((mContent == startContent) && (mContent == endContent)) {
// Selection starts and ends in this content (but maybe not this
// frame)
if ((startOffset >= mContentLength) || (endOffset <= 0)) {
// Selection doesn't intersect this frame
}
else if (endOffset < mContentLength) {
// End of selection is in this frame
aResult.mEndOffset = aIndicies[endOffset] - mContentOffset;
if (startOffset > 0) {
// Beginning of selection is also in this frame (this is the 3
// section case)
aResult.mStartOffset = aIndicies[startOffset] - mContentOffset;
}
else {
// This is a 2 section case
aResult.mStartOffset = 0;
}
if (startOffset == endOffset) {
aResult.mEmptySelection = PR_TRUE;
}
} else if (startOffset > 0) {
// This is a 2 section case
aResult.mStartOffset = aIndicies[startOffset] - mContentOffset;
} else {
// This is a 1 section case (where the entire section is
// selected)
aResult.mStartOffset = 0;
}
}
else if (aDocument->IsInRange(startContent, endContent, mContent)) {
if (mContent == startContent) {
// Selection starts (but does not end) in this content (but
// maybe not in this frame)
if (startOffset <= 0) {
// Selection starts before or at this frame
aResult.mStartOffset = 0;
}
else if (startOffset < mContentLength) {
// Selection starts somewhere in this frame
aResult.mStartOffset = aIndicies[startOffset] - mContentOffset;
}
else {
// Selection starts after this frame
}
}
else if (mContent == endContent) {
// Selection ends (but does not start) in this content (but
// maybe not in this frame)
if (endOffset <= 0) {
// Selection ends before this frame
}
else if (endOffset < mContentLength) {
// Selection ends in this frame
aResult.mStartOffset = 0;
aResult.mEndOffset = aIndicies[endOffset] - mContentOffset;
}
else {
// Selection ends after this frame (the entire frame is selected)
aResult.mStartOffset = 0;
}
}
else {
// Selection starts before this content and ends after this
// content therefore the entire frame is selected
aResult.mStartOffset = 0;
}
}
NS_IF_RELEASE(startContent);
NS_IF_RELEASE(endContent);
NS_RELEASE(selection);
}
#define XP_IS_SPACE_W XP_IS_SPACE
/**
* Prepare the text in the content for rendering. If aIndexes is not nsnull
* then fill in aIndexes's with the mapping from the original input to
* the prepared output.
*/
PRUnichar*
TextFrame::PrepareUnicodeText(nsIRenderingContext& aRenderingContext,
PRInt32* aIndexes,
PRUnichar* aBuffer, PRInt32 aBufSize,
PRInt32& aStrLen,
nscoord& aNewWidth)
{
PRUnichar* s = aBuffer;
PRUnichar* s0 = s;
// Get text content
PRInt32 textLength;
const PRUnichar* cp = GetText(mContent, textLength);
if (0 == textLength) {
aBuffer[0] = 0;
aStrLen = 0;
return aBuffer;
}
cp += mContentOffset;
const PRUnichar* end = cp + mContentLength;
// Skip leading space if necessary
PRInt32 mappingInx = 0;
PRInt32 strInx = mContentOffset;
if (0 != (mFlags & TEXT_SKIP_LEADING_WS)) {
while (cp < end) {
PRUnichar ch = *cp++;
if (!XP_IS_SPACE_W(ch)) {
cp--;
break;
} else {
if (nsnull != aIndexes) {
aIndexes[mappingInx++] = strInx;
}
}
}
}
PRInt32 length = 0;
if (0 != (TEXT_IS_PRE & mFlags)) {
PRIntn tabs = TEXT_GET_TAB_COUNT(mFlags);
// Make a copy of the text we are to render, translating tabs
// into whitespace.
PRInt32 maxLen = (end - cp) + 8*tabs;
if (maxLen > aBufSize) {
s0 = s = new PRUnichar[maxLen];
}
// Translate tabs into whitespace; translate other whitespace into
// spaces.
PRIntn col = (PRIntn) mColumn;
while (cp < end) {
PRUnichar ch = *cp++;
if (XP_IS_SPACE_W(ch)) {
if (ch == '\t') {
PRIntn spaces = 8 - (col & 7);
col += spaces;
while (--spaces >= 0) {
*s++ = ' ';
length++;
}
if (nsnull != aIndexes) {
aIndexes[mappingInx++] = strInx;
strInx++;/* XXX wrong? */
}
continue;
} else {
ch = ' ';
}
}
else if (ch == CH_NBSP) {
ch = ' ';
}
*s++ = ch;
length++;
if (nsnull != aIndexes) {
aIndexes[mappingInx++] = strInx;
strInx++;
}
col++;
}
} else {
// Make a copy of the text we are to render, compressing out
// whitespace; translating whitespace to literal spaces;
// eliminating trailing whitespace.
PRInt32 maxLen = end - cp;
if (maxLen > aBufSize) {
s0 = s = new PRUnichar[maxLen];
}
// Compress down the whitespace
while (cp < end) {
PRUnichar ch = *cp++;
if (XP_IS_SPACE_W(ch)) {
while (cp < end) {
ch = *cp++;
if (!XP_IS_SPACE_W(ch)) {
cp--;
break;
} else {
if (nsnull != aIndexes) {
aIndexes[mappingInx++] = strInx;
}
}
}
ch = ' ';
}
else if (ch == CH_NBSP) {
ch = ' ';
}
*s++ = ch;
length++;
if (nsnull != aIndexes) {
aIndexes[mappingInx++] = strInx;
strInx++;
}
}
}
// Now remove trailing whitespace
PRIntn zapped = 0;
while (s > s0) {
if (s[-1] == ' ') {
s--;
length--;
zapped++;
}
else
break;
}
if (0 != zapped) {
nscoord spaceWidth;
aRenderingContext.GetWidth(' ', spaceWidth);
aNewWidth = aNewWidth - spaceWidth*zapped;
}
aStrLen = length;
return s0;
}
/**
* Prepare the text in the content for rendering. If aIndexes is not nsnull
* then fill in aIndexes's with the mapping from the original input to
* the prepared output.
*/
char*
TextFrame::PrepareAsciiText(nsIRenderingContext& aRenderingContext,
PRInt32* aIndexes,
char* aBuffer, PRInt32 aBufSize,
PRInt32& aStrLen,
nscoord& aNewWidth)
{
char* s = aBuffer;
char* s0 = s;
// Get text content
PRInt32 textLength;
const PRUnichar* cp = GetText(mContent, textLength);
if (0 == textLength) {
aBuffer[0] = 0;
aStrLen = 0;
return aBuffer;
}
cp += mContentOffset;
const PRUnichar* end = cp + mContentLength;
// Skip leading space if necessary
PRInt32 mappingInx = 0;
PRInt32 strInx = mContentOffset;
if (0 != (mFlags & TEXT_SKIP_LEADING_WS)) {
while (cp < end) {
char ch = char(*cp++);
if (!XP_IS_SPACE(ch)) {
cp--;
break;
} else {
if (nsnull != aIndexes) {
aIndexes[mappingInx++] = strInx;
}
}
}
}
PRInt32 length = 0;
if (0 != (TEXT_IS_PRE & mFlags)) {
PRIntn tabs = TEXT_GET_TAB_COUNT(mFlags);
// Make a copy of the text we are to render, translating tabs
// into whitespace.
PRInt32 maxLen = (end - cp) + 8*tabs;
if (maxLen > aBufSize) {
s0 = s = new char[maxLen];
}
// Translate tabs into whitespace; translate other whitespace into
// spaces.
PRIntn col = (PRIntn) mColumn;
while (cp < end) {
char ch = char(*cp++);
if (XP_IS_SPACE(ch)) {
if (ch == '\t') {
PRIntn spaces = 8 - (col & 7);
col += spaces;
while (--spaces >= 0) {
*s++ = ' ';
length++;
}
if (nsnull != aIndexes) {
aIndexes[mappingInx++] = strInx;
strInx++;/* XXX wrong? */
}
continue;
} else {
ch = ' ';
}
}
else if (ch == CH_NBSP) {
ch = ' ';
}
*s++ = ch;
length++;
if (nsnull != aIndexes) {
aIndexes[mappingInx++] = strInx;
strInx++;
}
col++;
}
} else {
// Make a copy of the text we are to render, compressing out
// whitespace; translating whitespace to literal spaces;
// eliminating trailing whitespace.
PRInt32 maxLen = end - cp;
if (maxLen > aBufSize) {
s0 = s = new char[maxLen];
}
// Compress down the whitespace
while (cp < end) {
char ch = char(*cp++);
if (XP_IS_SPACE(ch)) {
while (cp < end) {
ch = char(*cp++);
if (!XP_IS_SPACE(ch)) {
cp--;
break;
} else {
if (nsnull != aIndexes) {
aIndexes[mappingInx++] = strInx;
}
}
}
ch = ' ';
}
else if (ch == CH_NBSP) {
ch = ' ';
}
*s++ = ch;
length++;
if (nsnull != aIndexes) {
aIndexes[mappingInx++] = strInx;
strInx++;
}
}
}
// Now remove trailing whitespace
PRIntn zapped = 0;
while (s > s0) {
if (s[-1] == ' ') {
s--;
length--;
zapped++;
}
else
break;
}
if (0 != zapped) {
nscoord spaceWidth;
aRenderingContext.GetWidth(' ', spaceWidth);
aNewWidth = aNewWidth - spaceWidth*zapped;
}
aStrLen = length;
return s0;
}
// XXX This clearly needs to be done by the container, *somehow*
#define CURSOR_COLOR NS_RGB(0,0,255)
static void
RenderSelectionCursor(nsIRenderingContext& aRenderingContext,
nscoord dx, nscoord dy, nscoord aHeight,
nscolor aCursorColor)
{
nsPoint pnts[4];
nscoord ox = aHeight / 4;
nscoord oy = ox;
nscoord x0 = dx;
nscoord y0 = dy + aHeight;
pnts[0].x = x0 - ox;
pnts[0].y = y0;
pnts[1].x = x0;
pnts[1].y = y0 - oy;
pnts[2].x = x0 + ox;
pnts[2].y = y0;
pnts[3].x = x0 - ox;
pnts[3].y = y0;
// Draw little blue triangle
aRenderingContext.SetColor(aCursorColor);
aRenderingContext.FillPolygon(pnts, 4);
}
// XXX letter-spacing
// XXX word-spacing
void
TextFrame::PaintTextDecorations(nsIRenderingContext& aRenderingContext,
PRUint8 aDecorations,
nscoord aX, nscoord aY, nscoord aWidth)
{
nsIFontMetrics* fontMetrics = aRenderingContext.GetFontMetrics();
if (nsnull != fontMetrics) {
nscolor overColor;
nscolor underColor;
nscolor strikeColor;
nsIStyleContext* context = mStyleContext;
PRUint8 decorMask = aDecorations;
NS_ADDREF(context);
do { // find decoration colors
const nsStyleText* styleText =
(const nsStyleText*)context->GetStyleData(eStyleStruct_Text);
if (decorMask & styleText->mTextDecoration) { // a decoration defined here
const nsStyleColor* styleColor =
(const nsStyleColor*)context->GetStyleData(eStyleStruct_Color);
if (NS_STYLE_TEXT_DECORATION_UNDERLINE & decorMask & styleText->mTextDecoration) {
underColor = styleColor->mColor;
decorMask &= ~NS_STYLE_TEXT_DECORATION_UNDERLINE;
}
if (NS_STYLE_TEXT_DECORATION_OVERLINE & decorMask & styleText->mTextDecoration) {
overColor = styleColor->mColor;
decorMask &= ~NS_STYLE_TEXT_DECORATION_OVERLINE;
}
if (NS_STYLE_TEXT_DECORATION_LINE_THROUGH & decorMask & styleText->mTextDecoration) {
strikeColor = styleColor->mColor;
decorMask &= ~NS_STYLE_TEXT_DECORATION_LINE_THROUGH;
}
}
if (0 != decorMask) {
nsIStyleContext* lastContext = context;
context = context->GetParent();
NS_RELEASE(lastContext);
}
} while ((nsnull != context) && (0 != decorMask));
NS_IF_RELEASE(context);
nscoord offset;
nscoord size;
nscoord baseline;
fontMetrics->GetMaxAscent(baseline);
if (aDecorations & (NS_FONT_DECORATION_OVERLINE | NS_FONT_DECORATION_UNDERLINE)) {
fontMetrics->GetUnderline(offset, size);
if (aDecorations & NS_FONT_DECORATION_OVERLINE) {
aRenderingContext.SetColor(overColor);
aRenderingContext.FillRect(aX, aY, aWidth, size);
}
if (aDecorations & NS_FONT_DECORATION_UNDERLINE) {
aRenderingContext.SetColor(underColor);
aRenderingContext.FillRect(aX, aY + baseline - offset, aWidth, size);
}
}
if (aDecorations & NS_FONT_DECORATION_LINE_THROUGH) {
fontMetrics->GetStrikeout(offset, size);
aRenderingContext.SetColor(strikeColor);
aRenderingContext.FillRect(aX, aY + baseline - offset, aWidth, size);
}
NS_RELEASE(fontMetrics);
}
}
void
TextFrame::PaintUnicodeText(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
nscolor aTextColor,
PRUint8 aDecorations,
nscolor aSelectionTextColor,
nscolor aSelectionBGColor,
nscoord dx, nscoord dy)
{
nsIPresShell* shell = aPresContext.GetShell();
nsIDocument* doc = shell->GetDocument();
PRBool displaySelection;
displaySelection = doc->GetDisplaySelection();
PRInt32 textLength;
PRInt32 indicies[500];
PRInt32* ip = indicies;
if (mContentLength > 500) {
ip = new PRInt32[mContentLength];
}
PRUnichar buf[500];
nscoord width = mRect.width;
PRUnichar* text = PrepareUnicodeText(aRenderingContext,
displaySelection ? ip : nsnull,
buf, 500, textLength, width);
if (0 != textLength) {
if (!displaySelection) {
// When there is no selection showing, use the fastest and
// simplest rendering approach
aRenderingContext.DrawString(text, textLength, dx, dy, width);
PaintTextDecorations(aRenderingContext, aDecorations, dx, dy, width);
}
else {
SelectionInfo si;
ComputeSelectionInfo(aRenderingContext, doc, ip, textLength, si);
nscoord textWidth;
nsIFontMetrics * fm = aRenderingContext.GetFontMetrics();
if (si.mEmptySelection) {
aRenderingContext.DrawString(text, textLength, dx, dy, width);
PaintTextDecorations(aRenderingContext, aDecorations, dx, dy, width);
aRenderingContext.GetWidth(text, PRUint32(si.mStartOffset), textWidth);
RenderSelectionCursor(aRenderingContext,
dx + textWidth, dy, mRect.height,
CURSOR_COLOR);
}
else {
nscoord x = dx;
if (0 != si.mStartOffset) {
// Render first (unselected) section
aRenderingContext.GetWidth(text, PRUint32(si.mStartOffset), textWidth);
aRenderingContext.DrawString(text, si.mStartOffset,
x, dy, textWidth);
PaintTextDecorations(aRenderingContext, aDecorations, x, dy, textWidth);
x += textWidth;
}
PRInt32 secondLen = si.mEndOffset - si.mStartOffset;
if (0 != secondLen) {
// Get the width of the second (selected) section
aRenderingContext.GetWidth(text + si.mStartOffset, PRUint32(secondLen), textWidth);
// Render second (selected) section
aRenderingContext.SetColor(aSelectionBGColor);
aRenderingContext.FillRect(x, dy, textWidth, mRect.height);
aRenderingContext.SetColor(aSelectionTextColor);
aRenderingContext.DrawString(text + si.mStartOffset, secondLen,
x, dy, textWidth);
PaintTextDecorations(aRenderingContext, aDecorations, x, dy, textWidth);
aRenderingContext.SetColor(aTextColor);
x += textWidth;
}
if (textLength != si.mEndOffset) {
PRInt32 thirdLen = textLength - si.mEndOffset;
// Render third (unselected) section
aRenderingContext.GetWidth(text + si.mEndOffset, PRUint32(thirdLen), textWidth);
aRenderingContext.DrawString(text + si.mEndOffset,
thirdLen, x, dy, textWidth);
PaintTextDecorations(aRenderingContext, aDecorations, x, dy, textWidth);
}
}
NS_RELEASE(fm);
}
}
// Cleanup
if (text != buf) {
delete [] text;
}
if (ip != indicies) {
delete [] ip;
}
NS_RELEASE(shell);
NS_RELEASE(doc);
}
void
TextFrame::PaintAsciiText(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
nscolor aTextColor,
PRUint8 aDecorations,
nscolor aSelectionTextColor,
nscolor aSelectionBGColor,
nscoord dx, nscoord dy)
{
nsIPresShell* shell = aPresContext.GetShell();
nsIDocument* doc = shell->GetDocument();
PRBool displaySelection;
displaySelection = doc->GetDisplaySelection();
PRInt32 textLength;
PRInt32 indicies[500];
PRInt32* ip = indicies;
if (mContentLength > 500) {
ip = new PRInt32[mContentLength];
}
char buf[500];
nscoord width = mRect.width;
char* text = PrepareAsciiText(aRenderingContext,
displaySelection ? ip : nsnull,
buf, 500, textLength, width);
if (0 != textLength) {
if (!displaySelection) {
// When there is no selection showing, use the fastest and
// simplest rendering approach
aRenderingContext.DrawString(text, textLength, dx, dy, width);
PaintTextDecorations(aRenderingContext, aDecorations, dx, dy, width);
}
else {
SelectionInfo si;
ComputeSelectionInfo(aRenderingContext, doc, ip, textLength, si);
nscoord textWidth;
nsIFontMetrics * fm = aRenderingContext.GetFontMetrics();
if (si.mEmptySelection) {
aRenderingContext.DrawString(text, textLength, dx, dy, width);
PaintTextDecorations(aRenderingContext, aDecorations, dx, dy, width);
aRenderingContext.GetWidth(text, PRUint32(si.mStartOffset), textWidth);
RenderSelectionCursor(aRenderingContext,
dx + textWidth, dy, mRect.height,
CURSOR_COLOR);
}
else {
nscoord x = dx;
if (0 != si.mStartOffset) {
// Render first (unselected) section
aRenderingContext.GetWidth(text, PRUint32(si.mStartOffset), textWidth);
aRenderingContext.DrawString(text, si.mStartOffset,
x, dy, textWidth);
PaintTextDecorations(aRenderingContext, aDecorations, x, dy, textWidth);
x += textWidth;
}
PRInt32 secondLen = si.mEndOffset - si.mStartOffset;
if (0 != secondLen) {
// Get the width of the second (selected) section
aRenderingContext.GetWidth(text + si.mStartOffset, PRUint32(secondLen), textWidth);
// Render second (selected) section
aRenderingContext.SetColor(aSelectionBGColor);
aRenderingContext.FillRect(x, dy, textWidth, mRect.height);
aRenderingContext.SetColor(aSelectionTextColor);
aRenderingContext.DrawString(text + si.mStartOffset, secondLen,
x, dy, textWidth);
PaintTextDecorations(aRenderingContext, aDecorations, x, dy, textWidth);
aRenderingContext.SetColor(aTextColor);
x += textWidth;
}
if (textLength != si.mEndOffset) {
PRInt32 thirdLen = textLength - si.mEndOffset;
// Render third (unselected) section
aRenderingContext.GetWidth(text + si.mEndOffset, PRUint32(thirdLen), textWidth);
aRenderingContext.DrawString(text + si.mEndOffset,
thirdLen, x, dy, textWidth);
PaintTextDecorations(aRenderingContext, aDecorations, x, dy, textWidth);
}
}
NS_RELEASE(fm);
}
}
// Cleanup
if (text != buf) {
delete [] text;
}
if (ip != indicies) {
delete [] ip;
}
NS_RELEASE(shell);
NS_RELEASE(doc);
}
NS_IMETHODIMP
TextFrame::FindTextRuns(nsLineLayout& aLineLayout)
{
if (nsnull == mPrevInFlow) {
aLineLayout.AddText(this);
}
return NS_OK;
}
//---------------------------------------------------
// Uses a binary search for find where the cursor falls in the line of text
// It also keeps track of the part of the string that has already been measured
// so it doesn't have to keep measuring the same text over and over
//
// Param "aBaseWidth" contains the width in twips of the portion
// of the text that has already been measured, and aBaseInx contains
// the index of the text that has already been measured.
//
// aTextWidth returns the (in twips) the length of the text that falls before the cursor
// aIndex contains the index of the text where the cursor falls
static PRBool
BinarySearchForPosition(nsIRenderingContext* acx,
PRUnichar* aText,
PRInt32 aBaseWidth,
PRInt32 aBaseInx,
PRInt32 aStartInx,
PRInt32 aEndInx,
PRInt32 aCursorPos,
PRInt32& aIndex,
PRInt32& aTextWidth)
{
PRInt32 range = aEndInx - aStartInx;
if (range == 1) {
aIndex = aStartInx + aBaseInx;
return PR_TRUE;
}
PRInt32 inx = aStartInx + (range / 2);
PRInt32 textWidth;
acx->GetWidth(aText, inx, textWidth);
PRInt32 fullWidth = aBaseWidth + textWidth;
if (fullWidth == aCursorPos) {
aIndex = inx;
return PR_TRUE;
} else if (aCursorPos < fullWidth) {
aTextWidth = aBaseWidth;
if (BinarySearchForPosition(acx, aText, aBaseWidth, aBaseInx, aStartInx, inx, aCursorPos, aIndex, aTextWidth)) {
return PR_TRUE;
}
} else {
aTextWidth = fullWidth;
PRInt32 end = aEndInx - inx;
if (BinarySearchForPosition(acx, aText+inx, fullWidth, aBaseInx+inx, 0, end, aCursorPos, aIndex, aTextWidth)) {
return PR_TRUE;
}
}
return PR_FALSE;
}
//---------------------------------------------------------------------------
// Uses a binary search to find the position of the cursor in the text.
// The "indices array is used to map from the compressed text back to the
// un-compressed text, selection is based on the un-compressed text, the visual
// display of selection is based on the compressed text.
//---------------------------------------------------------------------------
NS_IMETHODIMP
TextFrame::GetPosition(nsIPresContext& aCX,
nsIRenderingContext * aRendContext,
nsGUIEvent* aEvent,
nsIFrame* aNewFrame,
PRUint32& aAcutalContentOffset,
PRInt32& aOffset)
{
const PRInt16 kNumIndices = 512;
// Get the rendered form of the text
PRInt32 textLength;
PRInt32 indicies[kNumIndices];
PRInt32* ip = indicies;
if (mContentLength > kNumIndices) {
ip = new PRInt32[mContentLength+1];
}
PRUnichar buf[kNumIndices];
nscoord width = 0;
PRUnichar* text = PrepareUnicodeText(*aRendContext,
ip, buf, kNumIndices, textLength,
width);
ip[mContentLength] = ip[mContentLength-1]+1;
// Find the font metrics for this text
nsIStyleContext* styleContext;
aNewFrame->GetStyleContext(&aCX, styleContext);
const nsStyleFont *font = (const nsStyleFont*) styleContext->GetStyleData(eStyleStruct_Font);
NS_RELEASE(styleContext);
nsIFontMetrics* fm = aCX.GetMetricsFor(font->mFont);
PRInt32 offset = mContentOffset + mContentLength;
PRInt32 index;
PRInt32 textWidth;
aRendContext->SetFont(fm);
PRBool found = BinarySearchForPosition(aRendContext, text, 0, 0, 0, PRInt32(textLength), PRInt32(aEvent->point.x), index, textWidth);
if (found) {
PRInt32 charWidth;
aRendContext->GetWidth(text[index], charWidth);
charWidth /= 2;
if (PRInt32(aEvent->point.x) > textWidth+charWidth) {
index++;
}
offset = 0;
PRInt32 j;
PRInt32* ptr = ip; // We will use pointer math to make it fast, instead of indexing into ip
for (j=0;j<=PRInt32(mContentLength);j++) {
if (*ptr == index+mContentOffset) {
offset = j+mContentOffset;
break;
}
ptr++;
}
}
NS_RELEASE(fm);
if (ip != indicies) {
delete [] ip;
}
if (text != buf) {
delete [] text;
}
aAcutalContentOffset = ((TextFrame *)aNewFrame)->mContentOffset;
aOffset = offset;
return NS_OK;
}
NS_IMETHODIMP
TextFrame::Reflow(nsIPresContext& aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
("enter TextFrame::Reflow: aMaxSize=%d,%d",
aReflowState.maxSize.width, aReflowState.maxSize.height));
// Get starting offset into the content
PRInt32 startingOffset = 0;
if (nsnull != mPrevInFlow) {
TextFrame* prev = (TextFrame*) mPrevInFlow;
startingOffset = prev->mContentOffset + prev->mContentLength;
}
const nsStyleFont* font =
(const nsStyleFont*)mStyleContext->GetStyleData(eStyleStruct_Font);
// Initialize mFlags (without destroying the TEXT_BLINK_ON bit) bits
// that are filled in by the reflow routines.
mFlags &= TEXT_BLINK_ON;
if (font->mFont.decorations & NS_STYLE_TEXT_DECORATION_BLINK) {
if (0 == (mFlags & TEXT_BLINK_ON)) {
mFlags |= TEXT_BLINK_ON;
gTextBlinker->AddFrame(this);
}
}
const nsStyleText* text =
(const nsStyleText*)mStyleContext->GetStyleData(eStyleStruct_Text);
NS_ASSERTION(nsnull != aReflowState.lineLayout, "no line layout");
if (NS_STYLE_WHITESPACE_PRE == text->mWhiteSpace) {
// Use a specialized routine for pre-formatted text
aStatus = ReflowPre(*aReflowState.lineLayout, aMetrics, aReflowState,
*font, startingOffset);
} else {
// Use normal wrapping routine for non-pre text (this includes
// text that is not wrapping)
aStatus = ReflowNormal(*aReflowState.lineLayout, aMetrics, aReflowState,
*font, *text, startingOffset);
}
NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
("exit TextFrame::Reflow: status=%x width=%d",
aStatus, aMetrics.width));
return NS_OK;
}
// Reflow normal text (stuff that doesn't have to deal with horizontal
// tabs). Normal text reflow may or may not wrap depending on the
// "whiteSpace" style property.
nsReflowStatus
TextFrame::ReflowNormal(nsLineLayout& aLineLayout,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
const nsStyleFont& aFont,
const nsStyleText& aTextStyle,
PRInt32 aStartingOffset)
{
PRInt32 textLength;
const PRUnichar* cp = GetText(mContent, textLength);
cp += aStartingOffset;
const PRUnichar* end = cp + textLength - aStartingOffset;
const PRUnichar* cpStart = cp;
mContentOffset = aStartingOffset;
nsIFontMetrics* fm = aLineLayout.mPresContext.GetMetricsFor(aFont.mFont);
PRInt32 spaceWidth;
aReflowState.rendContext->SetFont(fm);
aReflowState.rendContext->GetWidth(' ', spaceWidth);
PRBool wrapping = PR_TRUE;
if (NS_STYLE_WHITESPACE_NORMAL != aTextStyle.mWhiteSpace) {
wrapping = PR_FALSE;
}
// Set whitespace skip flag
PRBool skipWhitespace = PR_FALSE;
if (aLineLayout.GetSkipLeadingWhiteSpace()) {
skipWhitespace = PR_TRUE;
mFlags |= TEXT_SKIP_LEADING_WS;
}
// Try to fit as much of the text as possible. Note that if we are
// at the left margin then the first word always fits. In addition,
// we compute the size of the largest word that we contain. If we
// end up containing nothing (because there isn't enough space for
// the first word) then we still compute the size of that first
// non-fitting word.
// XXX XP_IS_SPACE must not return true for the unicode &nbsp character
// XXX what about &zwj and it's cousins?
nscoord x = 0;
nscoord maxWidth = aReflowState.maxSize.width;
nscoord maxWordWidth = 0;
nscoord prevMaxWordWidth = 0;
nscoord lastWordWidth;
const PRUnichar* lastWordEnd = cpStart;
const PRUnichar* lastWordStart = nsnull;
PRBool hasMultibyte = PR_FALSE;
PRBool endsInWhitespace = PR_FALSE;
while (cp < end) {
PRUnichar ch = *cp++;
PRBool isWhitespace;
nscoord width;
if (XP_IS_SPACE(ch)) {
// Compress whitespace down to a single whitespace
while (cp < end) {
ch = *cp;
if (XP_IS_SPACE(ch)) {
cp++;
continue;
}
break;
}
if (skipWhitespace) {
skipWhitespace = PR_FALSE;
continue;
}
width = spaceWidth;
isWhitespace = PR_TRUE;
lastWordStart = cp;
} else {
// The character is not a space character. Find the end of the
// word and then measure it.
if (ch >= 128) {
hasMultibyte = PR_TRUE;
}
lastWordStart = cp - 1;
while (cp < end) {
ch = *cp;
if (ch >= 128) {
hasMultibyte = PR_TRUE;
}
if (!XP_IS_SPACE(ch)) {
cp++;
continue;
}
break;
}
aReflowState.rendContext->GetWidth(lastWordStart,
PRUint32(cp - lastWordStart),
width);
skipWhitespace = PR_FALSE;
isWhitespace = PR_FALSE;
lastWordWidth = width;
}
// Now that we have the end of the word or whitespace, see if it
// will fit.
if ((0 != x) && wrapping && (x + width > maxWidth)) {
// The word/whitespace will not fit.
cp = lastWordEnd;
break;
}
// The word/whitespace fits. Add it to the run of text.
x += width;
prevMaxWordWidth = maxWordWidth;
if (width > maxWordWidth) {
maxWordWidth = width;
}
lastWordEnd = cp;
endsInWhitespace = isWhitespace;
}
if (hasMultibyte) {
mFlags |= TEXT_HAS_MULTIBYTE;
}
// Post processing logic to deal with non-breakable-units (in
// english "words")
if (aLineLayout.InNonBreakingUnit()) {
// We are already in an nbu. This means a text frame prior to
// this one had a fragment of an nbu that is joined with this
// frame. It also means that the prior frame already found this
// frame and recorded it as part of the nbu.
#ifdef DEBUG_WORD_WRAPPING
ListTag(stdout);
printf(": in nbu; skipping\n");
#endif
aLineLayout.ForgetWordFrame(this);
}
else {
// There is no currently active nbu. This frame may contain the
// start of one.
if (endsInWhitespace) {
// Nope, this frame doesn't start an nbu.
aLineLayout.ForgetWordFrames();
}
else if ((nsnull != lastWordStart) && wrapping && (cp == end)) {
// This frame does start an nbu. However, there is no point
// messing around with it if we are already out of room.
if ((0 == aLineLayout.GetPlacedFrames()) || (x <= maxWidth)) {
// There is room for this nbu fragment. It's possible that
// this nbu fragment is the end of the text-run. If it's not
// then we continue with the look-ahead processing.
nsIFrame* next = aLineLayout.FindNextText(this);
if (nsnull != next) {
#ifdef DEBUG_WORD_WRAPPING
nsAutoString tmp(lastWordStart, cp - lastWordStart);
ListTag(stdout);
printf(": start='");
fputs(tmp, stdout);
printf("' baseWidth=%d\n", lastWordWidth);
#endif
// Look ahead in the text-run and compute the final nbu
// width, taking into account any style changes and stopping
// at the first breakable point.
nscoord nbuWidth = ComputeTotalWordWidth(aLineLayout, aReflowState,
next, lastWordWidth);
if ((0 == aLineLayout.GetPlacedFrames()) ||
(x - lastWordWidth + nbuWidth <= maxWidth)) {
// The fully joined nbu has fit. Account for the joined
// nbu's affect on the max-element-size here (since the
// joined nbu is large than it's pieces, the right effect
// will occur)
if (nbuWidth > maxWordWidth) {
maxWordWidth = nbuWidth;
}
}
else {
// The fully joined nbu won't fit. We need to reduce our
// size by the lastWordWidth.
x -= lastWordWidth;
maxWordWidth = prevMaxWordWidth;
cp = lastWordEnd = lastWordStart;
#ifdef DEBUG_WORD_WRAPPING
printf(" x=%d maxWordWidth=%d len=%d\n", x, maxWordWidth,
cp - cpStart);
#endif
aLineLayout.ForgetWordFrames();
}
}
}
}
}
if (0 == x) {
// Since we collapsed into nothingness (all our whitespace
// is ignored) leave the aState->mSkipLeadingWhiteSpace
// flag alone since it doesn't want leading whitespace
}
else {
aLineLayout.SetSkipLeadingWhiteSpace(endsInWhitespace);
}
// XXX too much code here: some of it isn't needed
// Now we know our content length
mContentLength = lastWordEnd - cpStart;
if (0 == mContentLength) {
if (cp == end) {
// The entire chunk of text was whitespace that we skipped over.
aMetrics.width = 0;
aMetrics.height = 0;
aMetrics.ascent = 0;
aMetrics.descent = 0;
mContentLength = end - cpStart;
if (nsnull != aMetrics.maxElementSize) {
aMetrics.maxElementSize->width = 0;
aMetrics.maxElementSize->height = 0;
}
NS_RELEASE(fm);
return NS_FRAME_COMPLETE;
}
}
// Set desired size to the computed size
aMetrics.width = x;
fm->GetHeight(aMetrics.height);
fm->GetMaxAscent(aMetrics.ascent);
fm->GetMaxDescent(aMetrics.descent);
if (!wrapping) {
maxWordWidth = x;
}
if (nsnull != aMetrics.maxElementSize) {
aMetrics.maxElementSize->width = maxWordWidth;
fm->GetHeight(aMetrics.maxElementSize->height);
}
NS_RELEASE(fm);
if (cp == end) {
return NS_FRAME_COMPLETE;
}
else if (cp == cpStart) {
return NS_INLINE_LINE_BREAK_BEFORE();
}
return NS_FRAME_NOT_COMPLETE;
}
nscoord
TextFrame::ComputeTotalWordWidth(nsLineLayout& aLineLayout,
const nsHTMLReflowState& aReflowState,
nsIFrame* aNextFrame,
nscoord aBaseWidth)
{
nscoord addedWidth = 0;
while (nsnull != aNextFrame) {
nsIFrame* frame = aNextFrame;
while (nsnull != frame) {
nsIContent* content = nsnull;
if ((NS_OK == frame->GetContent(content)) && (nsnull != content)) {
#ifdef DEBUG_WORD_WRAPPING
printf(" next textRun=");
frame->ListTag(stdout);
printf("\n");
#endif
nsITextContent* tc;
if (NS_OK == content->QueryInterface(kITextContentIID, (void**)&tc)) {
PRBool stop;
nscoord moreWidth = ComputeWordFragmentWidth(aLineLayout,
aReflowState,
frame, tc,
stop);
NS_RELEASE(tc);
NS_RELEASE(content);
addedWidth += moreWidth;
#ifdef DEBUG_WORD_WRAPPING
printf(" moreWidth=%d (addedWidth=%d) stop=%c\n", moreWidth,
addedWidth, stop?'T':'F');
#endif
if (stop) {
goto done;
}
}
else {
// It claimed it was text but it doesn't implement the
// nsITextContent API. Therefore I don't know what to do with it
// and can't look inside it. Oh well.
NS_RELEASE(content);
goto done;
}
}
// XXX This assumes that a next-in-flow will follow it's
// prev-in-flow in the text-run. Maybe not a good assumption?
// What if the next-in-flow isn't actually part of the flow?
frame->GetNextInFlow(frame);
}
// Move on to the next frame in the text-run
aNextFrame = aLineLayout.FindNextText(aNextFrame);
}
done:;
#ifdef DEBUG_WORD_WRAPPING
printf(" total word width=%d\n", aBaseWidth + addedWidth);
#endif
return aBaseWidth + addedWidth;
}
nscoord
TextFrame::ComputeWordFragmentWidth(nsLineLayout& aLineLayout,
const nsHTMLReflowState& aReflowState,
nsIFrame* aTextFrame,
nsITextContent* aText,
PRBool& aStop)
{
// Get a pointer and length count for the text
const PRUnichar* cp;
const PRUnichar* cp0;
const PRUnichar* end;
PRInt32 len;
if (NS_OK != aText->GetText(cp0, len)) {
aStop = PR_TRUE;
return 0;
}
cp = cp0;
end = cp0 + len;
// Count forward in the text until we hit a whitespace character or
// run out of text.
aStop = PR_FALSE;
while (cp < end) {
PRUnichar ch = *cp;
if (XP_IS_SPACE(ch)) {
aStop = PR_TRUE;
break;
}
cp++;
}
len = cp - cp0;
if (0 == len) {
// Don't bother measuring nothing
return 0;
}
const nsStyleFont* font;
aTextFrame->GetStyleData(eStyleStruct_Font, (const nsStyleStruct*&) font);
if (nsnull != font) {
// Measure the piece of text. Note that we have to select the
// appropriate font into the text first because the rendering
// context has our font in it, not the font that aText is using.
nscoord width;
nsIRenderingContext& rc = *aReflowState.rendContext;
nsIFontMetrics* oldfm = rc.GetFontMetrics();
nsIFontMetrics* fm = aLineLayout.mPresContext.GetMetricsFor(font->mFont);
rc.SetFont(fm);
rc.GetWidth(cp0, len, width);
rc.SetFont(oldfm);
NS_RELEASE(oldfm);
NS_RELEASE(fm);
#ifdef DEBUG_WORD_WRAPPING
nsAutoString tmp(cp0, len);
printf(" fragment='");
fputs(tmp, stdout);
printf("' width=%d\n", width);
#endif
// Remember the text frame for later so that we don't bother doing
// the word look ahead.
aLineLayout.RecordWordFrame(aTextFrame);
return width;
}
return 0;
}
nsReflowStatus
TextFrame::ReflowPre(nsLineLayout& aLineLayout,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
const nsStyleFont& aFont,
PRInt32 aStartingOffset)
{
nsReflowStatus rs = NS_FRAME_COMPLETE;
PRInt32 textLength;
const PRUnichar* cp = GetText(mContent, textLength);
cp += aStartingOffset;
const PRUnichar* cpStart = cp;
const PRUnichar* end = cp + textLength - aStartingOffset;
mFlags |= TEXT_IS_PRE;
nsIFontMetrics* fm = aLineLayout.mPresContext.GetMetricsFor(aFont.mFont);
PRInt32 width = 0;
PRBool hasMultibyte = PR_FALSE;
PRUint16 tabs = 0;
PRUint16 col = aLineLayout.GetColumn();
mColumn = col;
nscoord spaceWidth, charWidth;
aReflowState.rendContext->SetFont(fm);
aReflowState.rendContext->GetWidth(' ', spaceWidth);
// XXX change this to measure a line at a time
while (cp < end) {
PRUnichar ch = *cp++;
if (ch == '\n') {
rs = (cp == end)
? NS_INLINE_LINE_BREAK_AFTER(NS_FRAME_COMPLETE)
: NS_INLINE_LINE_BREAK_AFTER(NS_FRAME_NOT_COMPLETE);
break;
}
if (ch == '\t') {
// Advance to next tab stop
PRIntn spaces = 8 - (col & 7);
width += spaces * spaceWidth;
col += spaces;
tabs++;
continue;
}
if (ch == CH_NBSP) {
width += spaceWidth;
col++;
continue;
}
aReflowState.rendContext->GetWidth(ch, charWidth);
width += charWidth;
if (ch > 128) {
hasMultibyte = PR_TRUE;
}
col++;
}
aLineLayout.SetColumn(col);
if (hasMultibyte) {
mFlags |= TEXT_HAS_MULTIBYTE;
}
TEXT_SET_TAB_COUNT(mFlags, tabs);
mContentOffset = aStartingOffset;
mContentLength = cp - cpStart;
aMetrics.width = width;
fm->GetHeight(aMetrics.height);
fm->GetMaxAscent(aMetrics.ascent);
fm->GetMaxDescent(aMetrics.descent);
if (nsnull != aMetrics.maxElementSize) {
aMetrics.maxElementSize->width = aMetrics.width;
aMetrics.maxElementSize->height = aMetrics.height;
}
NS_RELEASE(fm);
return rs;
}
// XXX there is a copy of this in nsGenericDomDataNode.cpp
static void
ToCString(const PRUnichar* cp, PRInt32 aLen, nsString& aBuf)
{
const PRUnichar* end = cp + aLen;
while (cp < end) {
PRUnichar ch = *cp++;
if (ch == '\r') {
aBuf.Append("\\r");
} else if (ch == '\n') {
aBuf.Append("\\n");
} else if (ch == '\t') {
aBuf.Append("\\t");
} else if ((ch < ' ') || (ch >= 127)) {
aBuf.Append("\\0");
aBuf.Append((PRInt32)ch, 8);
} else {
aBuf.Append(ch);
}
}
}
NS_IMETHODIMP
TextFrame::ListTag(FILE* out) const
{
fprintf(out, "Text(%d)@%p", ContentIndexInContainer(this), this);
return NS_OK;
}
NS_IMETHODIMP
TextFrame::List(FILE* out, PRInt32 aIndent) const
{
PRInt32 i;
for (i = aIndent; --i >= 0; ) fputs(" ", out);
// Output the tag
ListTag(out);
nsIView* view;
GetView(view);
if (nsnull != view) {
fprintf(out, " [view=%p]", view);
}
// Output the first/last content offset and prev/next in flow info
// XXX inefficient (especially for really large strings)
PRInt32 textLength;
const PRUnichar* cp = GetText(mContent, textLength);
PRBool isComplete = (mContentOffset + mContentLength) == textLength;
fprintf(out, "[%d,%d,%c] ",
mContentOffset, mContentOffset+mContentLength-1,
isComplete ? 'T':'F');
if (nsnull != mPrevInFlow) {
fprintf(out, "prev-in-flow=%p ", mPrevInFlow);
}
if (nsnull != mNextInFlow) {
fprintf(out, "next-in-flow=%p ", mNextInFlow);
}
// Output the rect and state
out << mRect;
if (0 != mState) {
fprintf(out, " [state=%08x]", mState);
}
// Output the text
fputs("<\n", out);
aIndent++;
for (i = aIndent; --i >= 0; ) fputs(" ", out);
fputs("\"", out);
nsAutoString tmp;
ToCString(cp, mContentLength, tmp);
fputs(tmp, out);
fputs("\"\n", out);
aIndent--;
for (i = aIndent; --i >= 0; ) fputs(" ", out);
fputs(">\n", out);
return NS_OK;
}
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