mozilla
/
gecko-dev
зеркало из https://github.com/mozilla/gecko-dev.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность
gecko-dev/layout/xul/nsTextBoxFrame.cpp

1144 строки
37 KiB
C++
Исходник Ответственный История

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsTextBoxFrame.h"
#include "nsReadableUtils.h"
#include "nsCOMPtr.h"
#include "nsGkAtoms.h"
#include "nsPresContext.h"
#include "nsRenderingContext.h"
#include "nsStyleContext.h"
#include "nsIContent.h"
#include "nsNameSpaceManager.h"
#include "nsBoxLayoutState.h"
#include "nsMenuBarListener.h"
#include "nsXPIDLString.h"
#include "nsIServiceManager.h"
#include "nsIDOMElement.h"
#include "nsIDOMXULLabelElement.h"
#include "nsEventStateManager.h"
#include "nsITheme.h"
#include "nsUnicharUtils.h"
#include "nsContentUtils.h"
#include "nsCxPusher.h"
#include "nsDisplayList.h"
#include "nsCSSRendering.h"
#include "nsIReflowCallback.h"
#include "nsBoxFrame.h"
#include "mozilla/Preferences.h"
#include "nsLayoutUtils.h"
#include "mozilla/Attributes.h"
#ifdef ACCESSIBILITY
#include "nsAccessibilityService.h"
#endif
#ifdef IBMBIDI
#include "nsBidiUtils.h"
#include "nsBidiPresUtils.h"
#endif // IBMBIDI
using namespace mozilla;
class nsAccessKeyInfo
{
public:
int32_t mAccesskeyIndex;
nscoord mBeforeWidth, mAccessWidth, mAccessUnderlineSize, mAccessOffset;
};
bool nsTextBoxFrame::gAlwaysAppendAccessKey = false;
bool nsTextBoxFrame::gAccessKeyPrefInitialized = false;
bool nsTextBoxFrame::gInsertSeparatorBeforeAccessKey = false;
bool nsTextBoxFrame::gInsertSeparatorPrefInitialized = false;
nsIFrame*
NS_NewTextBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsTextBoxFrame (aPresShell, aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsTextBoxFrame)
NS_QUERYFRAME_HEAD(nsTextBoxFrame)
NS_QUERYFRAME_ENTRY(nsTextBoxFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsTextBoxFrameSuper)
nsresult
nsTextBoxFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
bool aResize;
bool aRedraw;
UpdateAttributes(aAttribute, aResize, aRedraw);
if (aResize) {
PresContext()->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eStyleChange,
NS_FRAME_IS_DIRTY);
} else if (aRedraw) {
nsBoxLayoutState state(PresContext());
Redraw(state);
}
// If the accesskey changed, register for the new value
// The old value has been unregistered in nsXULElement::SetAttr
if (aAttribute == nsGkAtoms::accesskey || aAttribute == nsGkAtoms::control)
RegUnregAccessKey(true);
return NS_OK;
}
nsTextBoxFrame::nsTextBoxFrame(nsIPresShell* aShell, nsStyleContext* aContext):
nsLeafBoxFrame(aShell, aContext), mAccessKeyInfo(nullptr), mCropType(CropRight),
mNeedsReflowCallback(false)
{
MarkIntrinsicWidthsDirty();
}
nsTextBoxFrame::~nsTextBoxFrame()
{
delete mAccessKeyInfo;
}
void
nsTextBoxFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsTextBoxFrameSuper::Init(aContent, aParent, aPrevInFlow);
bool aResize;
bool aRedraw;
UpdateAttributes(nullptr, aResize, aRedraw); /* update all */
// register access key
RegUnregAccessKey(true);
}
void
nsTextBoxFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
// unregister access key
RegUnregAccessKey(false);
nsTextBoxFrameSuper::DestroyFrom(aDestructRoot);
}
bool
nsTextBoxFrame::AlwaysAppendAccessKey()
{
if (!gAccessKeyPrefInitialized)
{
gAccessKeyPrefInitialized = true;
const char* prefName = "intl.menuitems.alwaysappendaccesskeys";
nsAdoptingString val = Preferences::GetLocalizedString(prefName);
gAlwaysAppendAccessKey = val.Equals(NS_LITERAL_STRING("true"));
}
return gAlwaysAppendAccessKey;
}
bool
nsTextBoxFrame::InsertSeparatorBeforeAccessKey()
{
if (!gInsertSeparatorPrefInitialized)
{
gInsertSeparatorPrefInitialized = true;
const char* prefName = "intl.menuitems.insertseparatorbeforeaccesskeys";
nsAdoptingString val = Preferences::GetLocalizedString(prefName);
gInsertSeparatorBeforeAccessKey = val.EqualsLiteral("true");
}
return gInsertSeparatorBeforeAccessKey;
}
class nsAsyncAccesskeyUpdate MOZ_FINAL : public nsIReflowCallback
{
public:
nsAsyncAccesskeyUpdate(nsIFrame* aFrame) : mWeakFrame(aFrame)
{
}
virtual bool ReflowFinished() MOZ_OVERRIDE
{
bool shouldFlush = false;
nsTextBoxFrame* frame =
static_cast<nsTextBoxFrame*>(mWeakFrame.GetFrame());
if (frame) {
shouldFlush = frame->UpdateAccesskey(mWeakFrame);
}
delete this;
return shouldFlush;
}
virtual void ReflowCallbackCanceled() MOZ_OVERRIDE
{
delete this;
}
nsWeakFrame mWeakFrame;
};
bool
nsTextBoxFrame::UpdateAccesskey(nsWeakFrame& aWeakThis)
{
nsAutoString accesskey;
nsCOMPtr<nsIDOMXULLabelElement> labelElement = do_QueryInterface(mContent);
NS_ENSURE_TRUE(aWeakThis.IsAlive(), false);
if (labelElement) {
// Accesskey may be stored on control.
// Because this method is called by the reflow callback, current context
// may not be the right one. Pushing the context of mContent so that
// if nsIDOMXULLabelElement is implemented in XBL, we don't get a
// security exception.
nsCxPusher cx;
if (cx.Push(mContent)) {
labelElement->GetAccessKey(accesskey);
NS_ENSURE_TRUE(aWeakThis.IsAlive(), false);
}
}
else {
mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::accesskey, accesskey);
}
if (!accesskey.Equals(mAccessKey)) {
// Need to get clean mTitle.
mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::value, mTitle);
mAccessKey = accesskey;
UpdateAccessTitle();
PresContext()->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eStyleChange,
NS_FRAME_IS_DIRTY);
return true;
}
return false;
}
void
nsTextBoxFrame::UpdateAttributes(nsIAtom* aAttribute,
bool& aResize,
bool& aRedraw)
{
bool doUpdateTitle = false;
aResize = false;
aRedraw = false;
if (aAttribute == nullptr || aAttribute == nsGkAtoms::crop) {
static nsIContent::AttrValuesArray strings[] =
{&nsGkAtoms::left, &nsGkAtoms::start, &nsGkAtoms::center,
&nsGkAtoms::right, &nsGkAtoms::end, nullptr};
CroppingStyle cropType;
switch (mContent->FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::crop,
strings, eCaseMatters)) {
case 0:
case 1:
cropType = CropLeft;
break;
case 2:
cropType = CropCenter;
break;
case 3:
case 4:
cropType = CropRight;
break;
default:
cropType = CropNone;
break;
}
if (cropType != mCropType) {
aResize = true;
mCropType = cropType;
}
}
if (aAttribute == nullptr || aAttribute == nsGkAtoms::value) {
mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::value, mTitle);
doUpdateTitle = true;
}
if (aAttribute == nullptr || aAttribute == nsGkAtoms::accesskey) {
mNeedsReflowCallback = true;
// Ensure that layout is refreshed and reflow callback called.
aResize = true;
}
if (doUpdateTitle) {
UpdateAccessTitle();
aResize = true;
}
}
class nsDisplayXULTextBox : public nsDisplayItem {
public:
nsDisplayXULTextBox(nsDisplayListBuilder* aBuilder,
nsTextBoxFrame* aFrame) :
nsDisplayItem(aBuilder, aFrame),
mDisableSubpixelAA(false)
{
MOZ_COUNT_CTOR(nsDisplayXULTextBox);
}
#ifdef NS_BUILD_REFCNT_LOGGING
virtual ~nsDisplayXULTextBox() {
MOZ_COUNT_DTOR(nsDisplayXULTextBox);
}
#endif
virtual void Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) MOZ_OVERRIDE;
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) MOZ_OVERRIDE;
NS_DISPLAY_DECL_NAME("XULTextBox", TYPE_XUL_TEXT_BOX)
virtual nsRect GetComponentAlphaBounds(nsDisplayListBuilder* aBuilder) MOZ_OVERRIDE;
virtual void DisableComponentAlpha() MOZ_OVERRIDE {
mDisableSubpixelAA = true;
}
void PaintTextToContext(nsRenderingContext* aCtx,
nsPoint aOffset,
const nscolor* aColor);
bool mDisableSubpixelAA;
};
static void
PaintTextShadowCallback(nsRenderingContext* aCtx,
nsPoint aShadowOffset,
const nscolor& aShadowColor,
void* aData)
{
reinterpret_cast<nsDisplayXULTextBox*>(aData)->
PaintTextToContext(aCtx, aShadowOffset, &aShadowColor);
}
void
nsDisplayXULTextBox::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
gfxContextAutoDisableSubpixelAntialiasing disable(aCtx->ThebesContext(),
mDisableSubpixelAA);
// Paint the text shadow before doing any foreground stuff
nsRect drawRect = static_cast<nsTextBoxFrame*>(mFrame)->mTextDrawRect +
ToReferenceFrame();
nsLayoutUtils::PaintTextShadow(mFrame, aCtx,
drawRect, mVisibleRect,
mFrame->StyleColor()->mColor,
PaintTextShadowCallback,
(void*)this);
PaintTextToContext(aCtx, nsPoint(0, 0), nullptr);
}
void
nsDisplayXULTextBox::PaintTextToContext(nsRenderingContext* aCtx,
nsPoint aOffset,
const nscolor* aColor)
{
static_cast<nsTextBoxFrame*>(mFrame)->
PaintTitle(*aCtx, mVisibleRect, ToReferenceFrame() + aOffset, aColor);
}
nsRect
nsDisplayXULTextBox::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) {
*aSnap = false;
return mFrame->GetVisualOverflowRectRelativeToSelf() + ToReferenceFrame();
}
nsRect
nsDisplayXULTextBox::GetComponentAlphaBounds(nsDisplayListBuilder* aBuilder)
{
return static_cast<nsTextBoxFrame*>(mFrame)->GetComponentAlphaBounds() +
ToReferenceFrame();
}
void
nsTextBoxFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
if (!IsVisibleForPainting(aBuilder))
return;
nsLeafBoxFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
aLists.Content()->AppendNewToTop(new (aBuilder)
nsDisplayXULTextBox(aBuilder, this));
}
void
nsTextBoxFrame::PaintTitle(nsRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsPoint aPt,
const nscolor* aOverrideColor)
{
if (mTitle.IsEmpty())
return;
DrawText(aRenderingContext, aDirtyRect, mTextDrawRect + aPt, aOverrideColor);
}
void
nsTextBoxFrame::DrawText(nsRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
const nsRect& aTextRect,
const nscolor* aOverrideColor)
{
nsPresContext* presContext = PresContext();
// paint the title
nscolor overColor;
nscolor underColor;
nscolor strikeColor;
uint8_t overStyle;
uint8_t underStyle;
uint8_t strikeStyle;
// Begin with no decorations
uint8_t decorations = NS_STYLE_TEXT_DECORATION_LINE_NONE;
// A mask of all possible decorations.
uint8_t decorMask = NS_STYLE_TEXT_DECORATION_LINE_LINES_MASK;
nsIFrame* f = this;
do { // find decoration colors
nsStyleContext* context = f->StyleContext();
if (!context->HasTextDecorationLines()) {
break;
}
const nsStyleTextReset* styleText = context->StyleTextReset();
if (decorMask & styleText->mTextDecorationLine) { // a decoration defined here
nscolor color;
if (aOverrideColor) {
color = *aOverrideColor;
} else {
bool isForeground;
styleText->GetDecorationColor(color, isForeground);
if (isForeground) {
color = nsLayoutUtils::GetColor(f, eCSSProperty_color);
}
}
uint8_t style = styleText->GetDecorationStyle();
if (NS_STYLE_TEXT_DECORATION_LINE_UNDERLINE & decorMask &
styleText->mTextDecorationLine) {
underColor = color;
underStyle = style;
decorMask &= ~NS_STYLE_TEXT_DECORATION_LINE_UNDERLINE;
decorations |= NS_STYLE_TEXT_DECORATION_LINE_UNDERLINE;
}
if (NS_STYLE_TEXT_DECORATION_LINE_OVERLINE & decorMask &
styleText->mTextDecorationLine) {
overColor = color;
overStyle = style;
decorMask &= ~NS_STYLE_TEXT_DECORATION_LINE_OVERLINE;
decorations |= NS_STYLE_TEXT_DECORATION_LINE_OVERLINE;
}
if (NS_STYLE_TEXT_DECORATION_LINE_LINE_THROUGH & decorMask &
styleText->mTextDecorationLine) {
strikeColor = color;
strikeStyle = style;
decorMask &= ~NS_STYLE_TEXT_DECORATION_LINE_LINE_THROUGH;
decorations |= NS_STYLE_TEXT_DECORATION_LINE_LINE_THROUGH;
}
}
} while (0 != decorMask &&
(f = nsLayoutUtils::GetParentOrPlaceholderFor(f)));
nsRefPtr<nsFontMetrics> fontMet;
nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fontMet));
nscoord offset;
nscoord size;
nscoord ascent = fontMet->MaxAscent();
nscoord baseline =
presContext->RoundAppUnitsToNearestDevPixels(aTextRect.y + ascent);
nsRefPtr<gfxContext> ctx = aRenderingContext.ThebesContext();
gfxPoint pt(presContext->AppUnitsToGfxUnits(aTextRect.x),
presContext->AppUnitsToGfxUnits(aTextRect.y));
gfxFloat width = presContext->AppUnitsToGfxUnits(aTextRect.width);
gfxFloat ascentPixel = presContext->AppUnitsToGfxUnits(ascent);
gfxFloat xInFrame = PresContext()->AppUnitsToGfxUnits(mTextDrawRect.x);
gfxRect dirtyRect(presContext->AppUnitsToGfxUnits(aDirtyRect));
// Underlines are drawn before overlines, and both before the text
// itself, per http://www.w3.org/TR/CSS21/zindex.html point 7.2.1.4.1.1.
// (We don't apply this rule to the access-key underline because we only
// find out where that is as a side effect of drawing the text, in the
// general case -- see below.)
if (decorations & (NS_FONT_DECORATION_OVERLINE |
NS_FONT_DECORATION_UNDERLINE)) {
fontMet->GetUnderline(offset, size);
gfxFloat offsetPixel = presContext->AppUnitsToGfxUnits(offset);
gfxFloat sizePixel = presContext->AppUnitsToGfxUnits(size);
if ((decorations & NS_FONT_DECORATION_UNDERLINE) &&
underStyle != NS_STYLE_TEXT_DECORATION_STYLE_NONE) {
nsCSSRendering::PaintDecorationLine(this, ctx, dirtyRect, underColor,
pt, xInFrame, gfxSize(width, sizePixel),
ascentPixel, offsetPixel,
NS_STYLE_TEXT_DECORATION_LINE_UNDERLINE, underStyle);
}
if ((decorations & NS_FONT_DECORATION_OVERLINE) &&
overStyle != NS_STYLE_TEXT_DECORATION_STYLE_NONE) {
nsCSSRendering::PaintDecorationLine(this, ctx, dirtyRect, overColor,
pt, xInFrame, gfxSize(width, sizePixel),
ascentPixel, ascentPixel,
NS_STYLE_TEXT_DECORATION_LINE_OVERLINE, overStyle);
}
}
nsRefPtr<nsRenderingContext> refContext =
PresContext()->PresShell()->GetReferenceRenderingContext();
aRenderingContext.SetFont(fontMet);
refContext->SetFont(fontMet);
CalculateUnderline(*refContext);
aRenderingContext.SetColor(aOverrideColor ? *aOverrideColor : StyleColor()->mColor);
#ifdef IBMBIDI
nsresult rv = NS_ERROR_FAILURE;
if (mState & NS_FRAME_IS_BIDI) {
presContext->SetBidiEnabled();
nsBidiLevel level = nsBidiPresUtils::BidiLevelFromStyle(StyleContext());
if (mAccessKeyInfo && mAccessKeyInfo->mAccesskeyIndex != kNotFound) {
// We let the RenderText function calculate the mnemonic's
// underline position for us.
nsBidiPositionResolve posResolve;
posResolve.logicalIndex = mAccessKeyInfo->mAccesskeyIndex;
rv = nsBidiPresUtils::RenderText(mCroppedTitle.get(), mCroppedTitle.Length(), level,
presContext, aRenderingContext,
*refContext,
aTextRect.x, baseline,
&posResolve,
1);
mAccessKeyInfo->mBeforeWidth = posResolve.visualLeftTwips;
mAccessKeyInfo->mAccessWidth = posResolve.visualWidth;
}
else
{
rv = nsBidiPresUtils::RenderText(mCroppedTitle.get(), mCroppedTitle.Length(), level,
presContext, aRenderingContext,
*refContext,
aTextRect.x, baseline);
}
}
if (NS_FAILED(rv) )
#endif // IBMBIDI
{
aRenderingContext.SetTextRunRTL(false);
if (mAccessKeyInfo && mAccessKeyInfo->mAccesskeyIndex != kNotFound) {
// In the simple (non-BiDi) case, we calculate the mnemonic's
// underline position by getting the text metric.
// XXX are attribute values always two byte?
if (mAccessKeyInfo->mAccesskeyIndex > 0)
mAccessKeyInfo->mBeforeWidth =
refContext->GetWidth(mCroppedTitle.get(),
mAccessKeyInfo->mAccesskeyIndex);
else
mAccessKeyInfo->mBeforeWidth = 0;
}
fontMet->DrawString(mCroppedTitle.get(), mCroppedTitle.Length(),
aTextRect.x, baseline, &aRenderingContext,
refContext.get());
}
if (mAccessKeyInfo && mAccessKeyInfo->mAccesskeyIndex != kNotFound) {
aRenderingContext.FillRect(aTextRect.x + mAccessKeyInfo->mBeforeWidth,
aTextRect.y + mAccessKeyInfo->mAccessOffset,
mAccessKeyInfo->mAccessWidth,
mAccessKeyInfo->mAccessUnderlineSize);
}
// Strikeout is drawn on top of the text, per
// http://www.w3.org/TR/CSS21/zindex.html point 7.2.1.4.1.1.
if ((decorations & NS_FONT_DECORATION_LINE_THROUGH) &&
strikeStyle != NS_STYLE_TEXT_DECORATION_STYLE_NONE) {
fontMet->GetStrikeout(offset, size);
gfxFloat offsetPixel = presContext->AppUnitsToGfxUnits(offset);
gfxFloat sizePixel = presContext->AppUnitsToGfxUnits(size);
nsCSSRendering::PaintDecorationLine(this, ctx, dirtyRect, strikeColor,
pt, xInFrame, gfxSize(width, sizePixel), ascentPixel,
offsetPixel, NS_STYLE_TEXT_DECORATION_LINE_LINE_THROUGH,
strikeStyle);
}
}
void
nsTextBoxFrame::CalculateUnderline(nsRenderingContext& aRenderingContext)
{
if (mAccessKeyInfo && mAccessKeyInfo->mAccesskeyIndex != kNotFound) {
// Calculate all fields of mAccessKeyInfo which
// are the same for both BiDi and non-BiDi frames.
const char16_t *titleString = mCroppedTitle.get();
aRenderingContext.SetTextRunRTL(false);
mAccessKeyInfo->mAccessWidth =
aRenderingContext.GetWidth(titleString[mAccessKeyInfo->
mAccesskeyIndex]);
nscoord offset, baseline;
nsFontMetrics* metrics = aRenderingContext.FontMetrics();
metrics->GetUnderline(offset, mAccessKeyInfo->mAccessUnderlineSize);
baseline = metrics->MaxAscent();
mAccessKeyInfo->mAccessOffset = baseline - offset;
}
}
nscoord
nsTextBoxFrame::CalculateTitleForWidth(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
nscoord aWidth)
{
if (mTitle.IsEmpty()) {
mCroppedTitle.Truncate();
return 0;
}
nsRefPtr<nsFontMetrics> fm;
nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));
aRenderingContext.SetFont(fm);
// see if the text will completely fit in the width given
nscoord titleWidth = nsLayoutUtils::GetStringWidth(this, &aRenderingContext,
mTitle.get(), mTitle.Length());
if (titleWidth <= aWidth) {
mCroppedTitle = mTitle;
#ifdef IBMBIDI
if (HasRTLChars(mTitle)) {
mState |= NS_FRAME_IS_BIDI;
}
#endif // IBMBIDI
return titleWidth; // fits, done.
}
const nsDependentString& kEllipsis = nsContentUtils::GetLocalizedEllipsis();
// start with an ellipsis
mCroppedTitle.Assign(kEllipsis);
// see if the width is even smaller than the ellipsis
// if so, clear the text (XXX set as many '.' as we can?).
aRenderingContext.SetTextRunRTL(false);
titleWidth = aRenderingContext.GetWidth(kEllipsis);
if (titleWidth > aWidth) {
mCroppedTitle.SetLength(0);
return 0;
}
// if the ellipsis fits perfectly, no use in trying to insert
if (titleWidth == aWidth)
return titleWidth;
aWidth -= titleWidth;
// XXX: This whole block should probably take surrogates into account
// XXX and clusters!
// ok crop things
switch (mCropType)
{
case CropNone:
case CropRight:
{
nscoord cwidth;
nscoord twidth = 0;
int length = mTitle.Length();
int i;
for (i = 0; i < length; ++i) {
char16_t ch = mTitle.CharAt(i);
// still in LTR mode
cwidth = aRenderingContext.GetWidth(ch);
if (twidth + cwidth > aWidth)
break;
twidth += cwidth;
#ifdef IBMBIDI
if (UCS2_CHAR_IS_BIDI(ch) ) {
mState |= NS_FRAME_IS_BIDI;
}
#endif // IBMBIDI
}
if (i == 0)
return titleWidth;
// insert what character we can in.
nsAutoString title( mTitle );
title.Truncate(i);
mCroppedTitle.Insert(title, 0);
}
break;
case CropLeft:
{
nscoord cwidth;
nscoord twidth = 0;
int length = mTitle.Length();
int i;
for (i=length-1; i >= 0; --i) {
char16_t ch = mTitle.CharAt(i);
cwidth = aRenderingContext.GetWidth(ch);
if (twidth + cwidth > aWidth)
break;
twidth += cwidth;
#ifdef IBMBIDI
if (UCS2_CHAR_IS_BIDI(ch) ) {
mState |= NS_FRAME_IS_BIDI;
}
#endif // IBMBIDI
}
if (i == length-1)
return titleWidth;
nsAutoString copy;
mTitle.Right(copy, length-1-i);
mCroppedTitle += copy;
}
break;
case CropCenter:
{
nscoord stringWidth =
nsLayoutUtils::GetStringWidth(this, &aRenderingContext,
mTitle.get(), mTitle.Length());
if (stringWidth <= aWidth) {
// the entire string will fit in the maximum width
mCroppedTitle.Insert(mTitle, 0);
break;
}
// determine how much of the string will fit in the max width
nscoord charWidth = 0;
nscoord totalWidth = 0;
char16_t ch;
int leftPos, rightPos;
nsAutoString leftString, rightString;
rightPos = mTitle.Length() - 1;
aRenderingContext.SetTextRunRTL(false);
for (leftPos = 0; leftPos <= rightPos;) {
// look at the next character on the left end
ch = mTitle.CharAt(leftPos);
charWidth = aRenderingContext.GetWidth(ch);
totalWidth += charWidth;
if (totalWidth > aWidth)
// greater than the allowable width
break;
leftString.Insert(ch, leftString.Length());
#ifdef IBMBIDI
if (UCS2_CHAR_IS_BIDI(ch))
mState |= NS_FRAME_IS_BIDI;
#endif
// look at the next character on the right end
if (rightPos > leftPos) {
// haven't looked at this character yet
ch = mTitle.CharAt(rightPos);
charWidth = aRenderingContext.GetWidth(ch);
totalWidth += charWidth;
if (totalWidth > aWidth)
// greater than the allowable width
break;
rightString.Insert(ch, 0);
#ifdef IBMBIDI
if (UCS2_CHAR_IS_BIDI(ch))
mState |= NS_FRAME_IS_BIDI;
#endif
}
// look at the next two characters
leftPos++;
rightPos--;
}
mCroppedTitle = leftString + kEllipsis + rightString;
}
break;
}
return nsLayoutUtils::GetStringWidth(this, &aRenderingContext,
mCroppedTitle.get(), mCroppedTitle.Length());
}
#define OLD_ELLIPSIS NS_LITERAL_STRING("...")
// the following block is to append the accesskey to mTitle if there is an accesskey
// but the mTitle doesn't have the character
void
nsTextBoxFrame::UpdateAccessTitle()
{
/*
* Note that if you change appending access key label spec,
* you need to maintain same logic in following methods. See bug 324159.
* toolkit/content/commonDialog.js (setLabelForNode)
* toolkit/content/widgets/text.xml (formatAccessKey)
*/
int32_t menuAccessKey;
nsMenuBarListener::GetMenuAccessKey(&menuAccessKey);
if (!menuAccessKey || mAccessKey.IsEmpty())
return;
if (!AlwaysAppendAccessKey() &&
FindInReadable(mAccessKey, mTitle, nsCaseInsensitiveStringComparator()))
return;
nsAutoString accessKeyLabel;
accessKeyLabel += '(';
accessKeyLabel += mAccessKey;
ToUpperCase(accessKeyLabel);
accessKeyLabel += ')';
if (mTitle.IsEmpty()) {
mTitle = accessKeyLabel;
return;
}
const nsDependentString& kEllipsis = nsContentUtils::GetLocalizedEllipsis();
uint32_t offset = mTitle.Length();
if (StringEndsWith(mTitle, kEllipsis)) {
offset -= kEllipsis.Length();
} else if (StringEndsWith(mTitle, OLD_ELLIPSIS)) {
// Try to check with our old ellipsis (for old addons)
offset -= OLD_ELLIPSIS.Length();
} else {
// Try to check with
// our default ellipsis (for non-localized addons) or ':'
const char16_t kLastChar = mTitle.Last();
if (kLastChar == char16_t(0x2026) || kLastChar == char16_t(':'))
offset--;
}
if (InsertSeparatorBeforeAccessKey() &&
offset > 0 && !NS_IS_SPACE(mTitle[offset - 1])) {
mTitle.Insert(' ', offset);
offset++;
}
mTitle.Insert(accessKeyLabel, offset);
}
void
nsTextBoxFrame::UpdateAccessIndex()
{
int32_t menuAccessKey;
nsMenuBarListener::GetMenuAccessKey(&menuAccessKey);
if (menuAccessKey) {
if (mAccessKey.IsEmpty()) {
if (mAccessKeyInfo) {
delete mAccessKeyInfo;
mAccessKeyInfo = nullptr;
}
} else {
if (!mAccessKeyInfo) {
mAccessKeyInfo = new nsAccessKeyInfo();
if (!mAccessKeyInfo)
return;
}
nsAString::const_iterator start, end;
mCroppedTitle.BeginReading(start);
mCroppedTitle.EndReading(end);
// remember the beginning of the string
nsAString::const_iterator originalStart = start;
bool found;
if (!AlwaysAppendAccessKey()) {
// not appending access key - do case-sensitive search
// first
found = FindInReadable(mAccessKey, start, end);
if (!found) {
// didn't find it - perform a case-insensitive search
start = originalStart;
found = FindInReadable(mAccessKey, start, end,
nsCaseInsensitiveStringComparator());
}
} else {
found = RFindInReadable(mAccessKey, start, end,
nsCaseInsensitiveStringComparator());
}
if (found)
mAccessKeyInfo->mAccesskeyIndex = Distance(originalStart, start);
else
mAccessKeyInfo->mAccesskeyIndex = kNotFound;
}
}
}
NS_IMETHODIMP
nsTextBoxFrame::DoLayout(nsBoxLayoutState& aBoxLayoutState)
{
if (mNeedsReflowCallback) {
nsIReflowCallback* cb = new nsAsyncAccesskeyUpdate(this);
if (cb) {
PresContext()->PresShell()->PostReflowCallback(cb);
}
mNeedsReflowCallback = false;
}
nsresult rv = nsLeafBoxFrame::DoLayout(aBoxLayoutState);
CalcDrawRect(*aBoxLayoutState.GetRenderingContext());
const nsStyleText* textStyle = StyleText();
nsRect scrollBounds(nsPoint(0, 0), GetSize());
nsRect textRect = mTextDrawRect;
nsRefPtr<nsFontMetrics> fontMet;
nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fontMet));
nsBoundingMetrics metrics =
fontMet->GetInkBoundsForVisualOverflow(mCroppedTitle.get(),
mCroppedTitle.Length(),
aBoxLayoutState.GetRenderingContext());
textRect.x -= metrics.leftBearing;
textRect.width = metrics.width;
// In DrawText() we always draw with the baseline at MaxAscent() (relative to mTextDrawRect),
textRect.y += fontMet->MaxAscent() - metrics.ascent;
textRect.height = metrics.ascent + metrics.descent;
// Our scrollable overflow is our bounds; our visual overflow may
// extend beyond that.
nsRect visualBounds;
visualBounds.UnionRect(scrollBounds, textRect);
nsOverflowAreas overflow(visualBounds, scrollBounds);
if (textStyle->mTextShadow) {
// text-shadow extends our visual but not scrollable bounds
nsRect &vis = overflow.VisualOverflow();
vis.UnionRect(vis, nsLayoutUtils::GetTextShadowRectsUnion(mTextDrawRect, this));
}
FinishAndStoreOverflow(overflow, GetSize());
return rv;
}
nsRect
nsTextBoxFrame::GetComponentAlphaBounds()
{
if (StyleText()->mTextShadow) {
return GetVisualOverflowRectRelativeToSelf();
}
return mTextDrawRect;
}
bool
nsTextBoxFrame::ComputesOwnOverflowArea()
{
return true;
}
/* virtual */ void
nsTextBoxFrame::MarkIntrinsicWidthsDirty()
{
mNeedsRecalc = true;
nsTextBoxFrameSuper::MarkIntrinsicWidthsDirty();
}
void
nsTextBoxFrame::GetTextSize(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
const nsString& aString,
nsSize& aSize, nscoord& aAscent)
{
nsRefPtr<nsFontMetrics> fontMet;
nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fontMet));
aSize.height = fontMet->MaxHeight();
aRenderingContext.SetFont(fontMet);
aSize.width =
nsLayoutUtils::GetStringWidth(this, &aRenderingContext,
aString.get(), aString.Length());
aAscent = fontMet->MaxAscent();
}
void
nsTextBoxFrame::CalcTextSize(nsBoxLayoutState& aBoxLayoutState)
{
if (mNeedsRecalc)
{
nsSize size;
nsPresContext* presContext = aBoxLayoutState.PresContext();
nsRenderingContext* rendContext = aBoxLayoutState.GetRenderingContext();
if (rendContext) {
GetTextSize(presContext, *rendContext,
mTitle, size, mAscent);
mTextSize = size;
mNeedsRecalc = false;
}
}
}
void
nsTextBoxFrame::CalcDrawRect(nsRenderingContext &aRenderingContext)
{
nsRect textRect(nsPoint(0, 0), GetSize());
nsMargin borderPadding;
GetBorderAndPadding(borderPadding);
textRect.Deflate(borderPadding);
// determine (cropped) title and underline position
nsPresContext* presContext = PresContext();
// determine (cropped) title which fits in aRect.width and its width
nscoord titleWidth =
CalculateTitleForWidth(presContext, aRenderingContext, textRect.width);
#ifdef ACCESSIBILITY
// Make sure to update the accessible tree in case when cropped title is
// changed.
nsAccessibilityService* accService = GetAccService();
if (accService) {
accService->UpdateLabelValue(PresContext()->PresShell(), mContent,
mCroppedTitle);
}
#endif
// determine if and at which position to put the underline
UpdateAccessIndex();
// make the rect as small as our (cropped) text.
nscoord outerWidth = textRect.width;
textRect.width = titleWidth;
// Align our text within the overall rect by checking our text-align property.
const nsStyleVisibility* vis = StyleVisibility();
const nsStyleText* textStyle = StyleText();
if (textStyle->mTextAlign == NS_STYLE_TEXT_ALIGN_CENTER)
textRect.x += (outerWidth - textRect.width)/2;
else if (textStyle->mTextAlign == NS_STYLE_TEXT_ALIGN_RIGHT ||
(textStyle->mTextAlign == NS_STYLE_TEXT_ALIGN_DEFAULT &&
vis->mDirection == NS_STYLE_DIRECTION_RTL) ||
(textStyle->mTextAlign == NS_STYLE_TEXT_ALIGN_END &&
vis->mDirection == NS_STYLE_DIRECTION_LTR)) {
textRect.x += (outerWidth - textRect.width);
}
mTextDrawRect = textRect;
}
/**
* Ok return our dimensions
*/
nsSize
nsTextBoxFrame::GetPrefSize(nsBoxLayoutState& aBoxLayoutState)
{
CalcTextSize(aBoxLayoutState);
nsSize size = mTextSize;
DISPLAY_PREF_SIZE(this, size);
AddBorderAndPadding(size);
bool widthSet, heightSet;
nsIFrame::AddCSSPrefSize(this, size, widthSet, heightSet);
return size;
}
/**
* Ok return our dimensions
*/
nsSize
nsTextBoxFrame::GetMinSize(nsBoxLayoutState& aBoxLayoutState)
{
CalcTextSize(aBoxLayoutState);
nsSize size = mTextSize;
DISPLAY_MIN_SIZE(this, size);
// if there is cropping our min width becomes our border and padding
if (mCropType != CropNone)
size.width = 0;
AddBorderAndPadding(size);
bool widthSet, heightSet;
nsIFrame::AddCSSMinSize(aBoxLayoutState, this, size, widthSet, heightSet);
return size;
}
nscoord
nsTextBoxFrame::GetBoxAscent(nsBoxLayoutState& aBoxLayoutState)
{
CalcTextSize(aBoxLayoutState);
nscoord ascent = mAscent;
nsMargin m(0,0,0,0);
GetBorderAndPadding(m);
ascent += m.top;
return ascent;
}
#ifdef DEBUG_FRAME_DUMP
nsresult
nsTextBoxFrame::GetFrameName(nsAString& aResult) const
{
MakeFrameName(NS_LITERAL_STRING("TextBox"), aResult);
aResult += NS_LITERAL_STRING("[value=") + mTitle + NS_LITERAL_STRING("]");
return NS_OK;
}
#endif
// If you make changes to this function, check its counterparts
// in nsBoxFrame and nsXULLabelFrame
nsresult
nsTextBoxFrame::RegUnregAccessKey(bool aDoReg)
{
// if we have no content, we can't do anything
if (!mContent)
return NS_ERROR_FAILURE;
// check if we have a |control| attribute
// do this check first because few elements have control attributes, and we
// can weed out most of the elements quickly.
// XXXjag a side-effect is that we filter out anonymous <label>s
// in e.g. <menu>, <menuitem>, <button>. These <label>s inherit
// |accesskey| and would otherwise register themselves, overwriting
// the content we really meant to be registered.
if (!mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::control))
return NS_OK;
// see if we even have an access key
nsAutoString accessKey;
mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::accesskey, accessKey);
if (accessKey.IsEmpty())
return NS_OK;
// With a valid PresContext we can get the ESM
// and (un)register the access key
nsEventStateManager *esm = PresContext()->EventStateManager();
uint32_t key = accessKey.First();
if (aDoReg)
esm->RegisterAccessKey(mContent, key);
else
esm->UnregisterAccessKey(mContent, key);
return NS_OK;
}
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку