| /** |
| * (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 2000 Dirk Mueller (mueller@kde.org) |
| * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved. |
| * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net) |
| * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com) |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #include "config.h" |
| #include "RenderText.h" |
| |
| #include "CharacterNames.h" |
| #include "InlineTextBox.h" |
| #include "Range.h" |
| #include "RenderArena.h" |
| #include "RenderBlock.h" |
| #include "RenderLayer.h" |
| #include "Text.h" |
| #include "TextBreakIterator.h" |
| #include "break_lines.h" |
| #include <wtf/AlwaysInline.h> |
| |
| using namespace std; |
| using namespace WTF; |
| using namespace Unicode; |
| |
| namespace WebCore { |
| |
| static inline bool charactersAreAllASCII(StringImpl* text) |
| { |
| const UChar* chars = text->characters(); |
| unsigned length = text->length(); |
| UChar ored = 0; |
| for (unsigned i = 0; i < length; ++i) |
| ored |= chars[i]; |
| return !(ored & 0xFF80); |
| } |
| |
| RenderText::RenderText(Node* node, PassRefPtr<StringImpl> str) |
| : RenderObject(node) |
| , m_text(str) |
| , m_firstTextBox(0) |
| , m_lastTextBox(0) |
| , m_minWidth(-1) |
| , m_maxWidth(-1) |
| , m_selectionState(SelectionNone) |
| , m_hasTab(false) |
| , m_linesDirty(false) |
| , m_containsReversedText(false) |
| , m_isAllASCII(charactersAreAllASCII(m_text.get())) |
| { |
| ASSERT(m_text); |
| setRenderText(); |
| m_text = m_text->replace('\\', backslashAsCurrencySymbol()); |
| } |
| |
| #ifndef NDEBUG |
| |
| RenderText::~RenderText() |
| { |
| ASSERT(!m_firstTextBox); |
| ASSERT(!m_lastTextBox); |
| } |
| |
| #endif |
| |
| void RenderText::setStyle(RenderStyle* newStyle) |
| { |
| RenderStyle* oldStyle = style(); |
| if (oldStyle == newStyle) |
| return; |
| |
| ETextTransform oldTransform = oldStyle ? oldStyle->textTransform() : TTNONE; |
| ETextSecurity oldSecurity = oldStyle ? oldStyle->textSecurity() : TSNONE; |
| |
| RenderObject::setStyle(newStyle); |
| |
| if (oldTransform != newStyle->textTransform() || oldSecurity != newStyle->textSecurity() |
| #if ENABLE(SVG) |
| || isSVGText() /* All SVG text has to be transformed */ |
| #endif |
| ) { |
| if (RefPtr<StringImpl> textToTransform = originalText()) |
| setText(textToTransform.release(), true); |
| } |
| } |
| |
| void RenderText::destroy() |
| { |
| if (!documentBeingDestroyed()) { |
| if (firstTextBox()) { |
| if (isBR()) { |
| RootInlineBox* next = firstTextBox()->root()->nextRootBox(); |
| if (next) |
| next->markDirty(); |
| } |
| for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) |
| box->remove(); |
| } else if (parent()) |
| parent()->dirtyLinesFromChangedChild(this); |
| } |
| deleteTextBoxes(); |
| RenderObject::destroy(); |
| } |
| |
| void RenderText::extractTextBox(InlineTextBox* box) |
| { |
| checkConsistency(); |
| |
| m_lastTextBox = box->prevTextBox(); |
| if (box == m_firstTextBox) |
| m_firstTextBox = 0; |
| if (box->prevTextBox()) |
| box->prevTextBox()->setNextLineBox(0); |
| box->setPreviousLineBox(0); |
| for (InlineRunBox* curr = box; curr; curr = curr->nextLineBox()) |
| curr->setExtracted(); |
| |
| checkConsistency(); |
| } |
| |
| void RenderText::attachTextBox(InlineTextBox* box) |
| { |
| checkConsistency(); |
| |
| if (m_lastTextBox) { |
| m_lastTextBox->setNextLineBox(box); |
| box->setPreviousLineBox(m_lastTextBox); |
| } else |
| m_firstTextBox = box; |
| InlineTextBox* last = box; |
| for (InlineTextBox* curr = box; curr; curr = curr->nextTextBox()) { |
| curr->setExtracted(false); |
| last = curr; |
| } |
| m_lastTextBox = last; |
| |
| checkConsistency(); |
| } |
| |
| void RenderText::removeTextBox(InlineTextBox* box) |
| { |
| checkConsistency(); |
| |
| if (box == m_firstTextBox) |
| m_firstTextBox = box->nextTextBox(); |
| if (box == m_lastTextBox) |
| m_lastTextBox = box->prevTextBox(); |
| if (box->nextTextBox()) |
| box->nextTextBox()->setPreviousLineBox(box->prevTextBox()); |
| if (box->prevTextBox()) |
| box->prevTextBox()->setNextLineBox(box->nextTextBox()); |
| |
| checkConsistency(); |
| } |
| |
| void RenderText::deleteTextBoxes() |
| { |
| if (firstTextBox()) { |
| RenderArena* arena = renderArena(); |
| InlineTextBox* next; |
| for (InlineTextBox* curr = firstTextBox(); curr; curr = next) { |
| next = curr->nextTextBox(); |
| curr->destroy(arena); |
| } |
| m_firstTextBox = m_lastTextBox = 0; |
| } |
| } |
| |
| PassRefPtr<StringImpl> RenderText::originalText() const |
| { |
| Node* e = element(); |
| return e ? static_cast<Text*>(e)->string() : 0; |
| } |
| |
| void RenderText::absoluteRects(Vector<IntRect>& rects, int tx, int ty, bool) |
| { |
| for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) |
| rects.append(IntRect(tx + box->xPos(), ty + box->yPos(), box->width(), box->height())); |
| } |
| |
| void RenderText::addLineBoxRects(Vector<IntRect>& rects, unsigned start, unsigned end, bool useSelectionHeight) |
| { |
| // Work around signed/unsigned issues. This function takes unsigneds, and is often passed UINT_MAX |
| // to mean "all the way to the end". InlineTextBox coordinates are unsigneds, so changing this |
| // function to take ints causes various internal mismatches. But selectionRect takes ints, and |
| // passing UINT_MAX to it causes trouble. Ideally we'd change selectionRect to take unsigneds, but |
| // that would cause many ripple effects, so for now we'll just clamp our unsigned parameters to INT_MAX. |
| ASSERT(end == UINT_MAX || end <= INT_MAX); |
| ASSERT(start <= INT_MAX); |
| start = min(start, static_cast<unsigned>(INT_MAX)); |
| end = min(end, static_cast<unsigned>(INT_MAX)); |
| |
| int x, y; |
| absolutePositionForContent(x, y); |
| |
| for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) { |
| // Note: box->end() returns the index of the last character, not the index past it |
| if (start <= box->start() && box->end() < end) { |
| IntRect r = IntRect(x + box->xPos(), y + box->yPos(), box->width(), box->height()); |
| if (useSelectionHeight) { |
| IntRect selectionRect = box->selectionRect(x, y, start, end); |
| r.setHeight(selectionRect.height()); |
| r.setY(selectionRect.y()); |
| } |
| rects.append(r); |
| } else { |
| unsigned realEnd = min(box->end() + 1, end); |
| IntRect r = box->selectionRect(x, y, start, realEnd); |
| if (!r.isEmpty()) { |
| if (!useSelectionHeight) { |
| // change the height and y position because selectionRect uses selection-specific values |
| r.setHeight(box->height()); |
| r.setY(y + box->yPos()); |
| } |
| rects.append(r); |
| } |
| } |
| } |
| } |
| |
| InlineTextBox* RenderText::findNextInlineTextBox(int offset, int& pos) const |
| { |
| // The text runs point to parts of the RenderText's m_text |
| // (they don't include '\n') |
| // Find the text run that includes the character at offset |
| // and return pos, which is the position of the char in the run. |
| |
| if (!m_firstTextBox) |
| return 0; |
| |
| InlineTextBox* s = m_firstTextBox; |
| int off = s->m_len; |
| while (offset > off && s->nextTextBox()) { |
| s = s->nextTextBox(); |
| off = s->m_start + s->m_len; |
| } |
| // we are now in the correct text run |
| pos = (offset > off ? s->m_len : s->m_len - (off - offset) ); |
| return s; |
| } |
| |
| VisiblePosition RenderText::positionForCoordinates(int x, int y) |
| { |
| if (!firstTextBox() || textLength() == 0) |
| return VisiblePosition(element(), 0, DOWNSTREAM); |
| |
| // Get the offset for the position, since this will take rtl text into account. |
| int offset; |
| |
| // FIXME: We should be able to roll these special cases into the general cases in the loop below. |
| if (firstTextBox() && y < firstTextBox()->root()->bottomOverflow() && x < firstTextBox()->m_x) { |
| // at the y coordinate of the first line or above |
| // and the x coordinate is to the left of the first text box left edge |
| offset = firstTextBox()->offsetForPosition(x); |
| return VisiblePosition(element(), offset + firstTextBox()->m_start, DOWNSTREAM); |
| } |
| if (lastTextBox() && y >= lastTextBox()->root()->topOverflow() && x >= lastTextBox()->m_x + lastTextBox()->m_width) { |
| // at the y coordinate of the last line or below |
| // and the x coordinate is to the right of the last text box right edge |
| offset = lastTextBox()->offsetForPosition(x); |
| return VisiblePosition(element(), offset + lastTextBox()->m_start, DOWNSTREAM); |
| } |
| |
| InlineTextBox* lastBoxAbove = 0; |
| for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) { |
| if (y >= box->root()->topOverflow()) { |
| int bottom = box->root()->nextRootBox() ? box->root()->nextRootBox()->topOverflow() : box->root()->bottomOverflow(); |
| if (y < bottom) { |
| offset = box->offsetForPosition(x); |
| |
| if (x == box->m_x) |
| // the x coordinate is equal to the left edge of this box |
| // the affinity must be downstream so the position doesn't jump back to the previous line |
| return VisiblePosition(element(), offset + box->m_start, DOWNSTREAM); |
| |
| if (x < box->m_x + box->m_width) |
| // and the x coordinate is to the left of the right edge of this box |
| // check to see if position goes in this box |
| return VisiblePosition(element(), offset + box->m_start, offset > 0 ? VP_UPSTREAM_IF_POSSIBLE : DOWNSTREAM); |
| |
| if (!box->prevOnLine() && x < box->m_x) |
| // box is first on line |
| // and the x coordinate is to the left of the first text box left edge |
| return VisiblePosition(element(), offset + box->m_start, DOWNSTREAM); |
| |
| if (!box->nextOnLine()) |
| // box is last on line |
| // and the x coordinate is to the right of the last text box right edge |
| // generate VisiblePosition, use UPSTREAM affinity if possible |
| return VisiblePosition(element(), offset + box->m_start, VP_UPSTREAM_IF_POSSIBLE); |
| } |
| lastBoxAbove = box; |
| } |
| } |
| |
| return VisiblePosition(element(), lastBoxAbove ? lastBoxAbove->m_start + lastBoxAbove->m_len : 0, DOWNSTREAM); |
| } |
| |
| static RenderObject* lastRendererOnPrevLine(InlineBox* box) |
| { |
| if (!box) |
| return 0; |
| |
| RootInlineBox* root = box->root(); |
| if (!root) |
| return 0; |
| |
| if (root->endsWithBreak()) |
| return 0; |
| |
| RootInlineBox* prevRoot = root->prevRootBox(); |
| if (!prevRoot) |
| return 0; |
| |
| InlineBox* lastChild = prevRoot->lastChild(); |
| if (!lastChild) |
| return 0; |
| |
| return lastChild->object(); |
| } |
| |
| static inline bool atLineWrap(InlineTextBox* box, int offset) |
| { |
| return box->nextTextBox() && !box->nextOnLine() && offset == box->m_start + box->m_len; |
| } |
| |
| IntRect RenderText::caretRect(int offset, EAffinity affinity, int* extraWidthToEndOfLine) |
| { |
| if (!firstTextBox() || !textLength()) |
| return IntRect(); |
| |
| // Find the text box for the given offset |
| InlineTextBox* box = 0; |
| for (box = firstTextBox(); box; box = box->nextTextBox()) { |
| if (box->containsCaretOffset(offset)) { |
| // Check if downstream affinity would make us move to the next line. |
| if (atLineWrap(box, offset) && affinity == DOWNSTREAM) { |
| // Use the next text box |
| box = box->nextTextBox(); |
| offset = box->m_start; |
| } else { |
| InlineTextBox* prevBox = box->prevTextBox(); |
| if (offset == box->m_start && affinity == UPSTREAM && prevBox && !box->prevOnLine()) { |
| if (prevBox) { |
| box = prevBox; |
| offset = box->m_start + box->m_len; |
| } else { |
| RenderObject *object = lastRendererOnPrevLine(box); |
| if (object) |
| return object->caretRect(0, affinity); |
| } |
| } |
| } |
| break; |
| } |
| } |
| |
| if (!box) |
| return IntRect(); |
| |
| int height = box->root()->bottomOverflow() - box->root()->topOverflow(); |
| int top = box->root()->topOverflow(); |
| |
| int left = box->positionForOffset(offset); |
| |
| int rootLeft = box->root()->xPos(); |
| // FIXME: should we use the width of the root inline box or the |
| // width of the containing block for this? |
| if (extraWidthToEndOfLine) |
| *extraWidthToEndOfLine = (box->root()->width() + rootLeft) - (left + 1); |
| |
| int absx, absy; |
| absolutePositionForContent(absx, absy); |
| left += absx; |
| top += absy; |
| |
| RenderBlock* cb = containingBlock(); |
| if (style()->autoWrap()) { |
| int availableWidth = cb->lineWidth(top); |
| if (!box->m_reversed) |
| left = min(left, absx + rootLeft + availableWidth - 1); |
| else |
| left = max(left, absx + rootLeft); |
| } |
| |
| return IntRect(left, top, 1, height); |
| } |
| |
| ALWAYS_INLINE int RenderText::widthFromCache(const Font& f, int start, int len, int xPos) const |
| { |
| if (f.isFixedPitch() && !f.isSmallCaps() && m_isAllASCII) { |
| // FIXME: This code should be simplfied; it's only run when m_text is known to be all 0000-007F, |
| // but is uses the general purpose Unicode direction function. |
| int monospaceCharacterWidth = f.spaceWidth(); |
| int tabWidth = allowTabs() ? monospaceCharacterWidth * 8 : 0; |
| int w = 0; |
| char previousChar = ' '; // FIXME: Preserves historical behavior, but seems wrong for start > 0. |
| for (int i = start; i < start + len; i++) { |
| char c = (*m_text)[i]; |
| Direction dir = direction(c); |
| if (dir != NonSpacingMark && dir != BoundaryNeutral) { |
| if (c == '\t' && tabWidth) |
| w += tabWidth - ((xPos + w) % tabWidth); |
| else |
| w += monospaceCharacterWidth; |
| if (isASCIISpace(c) && !isASCIISpace(previousChar)) |
| w += f.wordSpacing(); |
| } |
| previousChar = c; |
| } |
| return w; |
| } |
| |
| return f.width(TextRun(text()->characters() + start, len, allowTabs(), xPos)); |
| } |
| |
| void RenderText::trimmedPrefWidths(int leadWidth, |
| int& beginMinW, bool& beginWS, |
| int& endMinW, bool& endWS, |
| bool& hasBreakableChar, bool& hasBreak, |
| int& beginMaxW, int& endMaxW, |
| int& minW, int& maxW, bool& stripFrontSpaces) |
| { |
| bool collapseWhiteSpace = style()->collapseWhiteSpace(); |
| if (!collapseWhiteSpace) |
| stripFrontSpaces = false; |
| |
| if (m_hasTab || prefWidthsDirty()) |
| calcPrefWidths(leadWidth); |
| |
| int len = textLength(); |
| if (!len || (stripFrontSpaces && m_text->containsOnlyWhitespace())) { |
| maxW = 0; |
| hasBreak = false; |
| return; |
| } |
| |
| minW = m_minWidth; |
| maxW = m_maxWidth; |
| beginWS = !stripFrontSpaces && m_hasBeginWS; |
| endWS = m_hasEndWS; |
| |
| beginMinW = m_beginMinWidth; |
| endMinW = m_endMinWidth; |
| |
| hasBreakableChar = m_hasBreakableChar; |
| hasBreak = m_hasBreak; |
| |
| if ((*m_text)[0] == ' ' || ((*m_text)[0] == '\n' && !style()->preserveNewline()) || (*m_text)[0] == '\t') { |
| const Font& f = style()->font(); // FIXME: This ignores first-line. |
| if (stripFrontSpaces) { |
| const UChar space = ' '; |
| int spaceWidth = f.width(TextRun(&space, 1)); |
| maxW -= spaceWidth; |
| } else |
| maxW += f.wordSpacing(); |
| } |
| |
| stripFrontSpaces = collapseWhiteSpace && m_hasEndWS; |
| |
| if (!style()->autoWrap() || minW > maxW) |
| minW = maxW; |
| |
| // Compute our max widths by scanning the string for newlines. |
| if (hasBreak) { |
| const Font& f = style()->font(); // FIXME: This ignores first-line. |
| bool firstLine = true; |
| beginMaxW = maxW; |
| endMaxW = maxW; |
| for (int i = 0; i < len; i++) { |
| int linelen = 0; |
| while (i + linelen < len && (*m_text)[i + linelen] != '\n') |
| linelen++; |
| |
| if (linelen) { |
| endMaxW = widthFromCache(f, i, linelen, leadWidth + endMaxW); |
| if (firstLine) { |
| firstLine = false; |
| leadWidth = 0; |
| beginMaxW = endMaxW; |
| } |
| i += linelen; |
| } else if (firstLine) { |
| beginMaxW = 0; |
| firstLine = false; |
| leadWidth = 0; |
| } |
| |
| if (i == len - 1) |
| // A <pre> run that ends with a newline, as in, e.g., |
| // <pre>Some text\n\n<span>More text</pre> |
| endMaxW = 0; |
| } |
| } |
| } |
| |
| static inline bool isSpaceAccordingToStyle(UChar c, RenderStyle* style) |
| { |
| return c == ' ' || (c == noBreakSpace && style->nbspMode() == SPACE); |
| } |
| |
| int RenderText::minPrefWidth() const |
| { |
| if (prefWidthsDirty()) |
| const_cast<RenderText*>(this)->calcPrefWidths(0); |
| |
| return m_minWidth; |
| } |
| |
| int RenderText::maxPrefWidth() const |
| { |
| if (prefWidthsDirty()) |
| const_cast<RenderText*>(this)->calcPrefWidths(0); |
| |
| return m_maxWidth; |
| } |
| |
| void RenderText::calcPrefWidths(int leadWidth) |
| { |
| ASSERT(m_hasTab || prefWidthsDirty()); |
| |
| m_minWidth = 0; |
| m_beginMinWidth = 0; |
| m_endMinWidth = 0; |
| m_maxWidth = 0; |
| |
| if (isBR()) |
| return; |
| |
| int currMinWidth = 0; |
| int currMaxWidth = 0; |
| m_hasBreakableChar = false; |
| m_hasBreak = false; |
| m_hasTab = false; |
| m_hasBeginWS = false; |
| m_hasEndWS = false; |
| |
| const Font& f = style()->font(); // FIXME: This ignores first-line. |
| int wordSpacing = style()->wordSpacing(); |
| int len = textLength(); |
| const UChar* txt = characters(); |
| bool needsWordSpacing = false; |
| bool ignoringSpaces = false; |
| bool isSpace = false; |
| bool firstWord = true; |
| bool firstLine = true; |
| int nextBreakable = -1; |
| int lastWordBoundary = 0; |
| |
| bool breakNBSP = style()->autoWrap() && style()->nbspMode() == SPACE; |
| bool breakAll = (style()->wordBreak() == BreakAllWordBreak || style()->wordBreak() == BreakWordBreak) && style()->autoWrap(); |
| |
| for (int i = 0; i < len; i++) { |
| UChar c = txt[i]; |
| |
| bool previousCharacterIsSpace = isSpace; |
| |
| bool isNewline = false; |
| if (c == '\n') { |
| if (style()->preserveNewline()) { |
| m_hasBreak = true; |
| isNewline = true; |
| isSpace = false; |
| } else |
| isSpace = true; |
| } else if (c == '\t') { |
| if (!style()->collapseWhiteSpace()) { |
| m_hasTab = true; |
| isSpace = false; |
| } else |
| isSpace = true; |
| } else |
| isSpace = c == ' '; |
| |
| if ((isSpace || isNewline) && !i) |
| m_hasBeginWS = true; |
| if ((isSpace || isNewline) && i == len - 1) |
| m_hasEndWS = true; |
| |
| if (!ignoringSpaces && style()->collapseWhiteSpace() && previousCharacterIsSpace && isSpace) |
| ignoringSpaces = true; |
| |
| if (ignoringSpaces && !isSpace) |
| ignoringSpaces = false; |
| |
| // Ignore spaces and soft hyphens |
| if (ignoringSpaces) { |
| ASSERT(lastWordBoundary == i); |
| lastWordBoundary++; |
| continue; |
| } else if (c == softHyphen) { |
| currMaxWidth += widthFromCache(f, lastWordBoundary, i - lastWordBoundary, leadWidth + currMaxWidth); |
| lastWordBoundary = i + 1; |
| continue; |
| } |
| |
| bool hasBreak = breakAll || isBreakable(txt, i, len, nextBreakable, breakNBSP); |
| bool betweenWords = true; |
| int j = i; |
| while (c != '\n' && !isSpaceAccordingToStyle(c, style()) && c != '\t' && c != softHyphen) { |
| j++; |
| if (j == len) |
| break; |
| c = txt[j]; |
| if (isBreakable(txt, j, len, nextBreakable, breakNBSP)) |
| break; |
| if (breakAll) { |
| betweenWords = false; |
| break; |
| } |
| } |
| |
| int wordLen = j - i; |
| if (wordLen) { |
| int w = widthFromCache(f, i, wordLen, leadWidth + currMaxWidth); |
| currMinWidth += w; |
| if (betweenWords) { |
| if (lastWordBoundary == i) |
| currMaxWidth += w; |
| else |
| currMaxWidth += widthFromCache(f, lastWordBoundary, j - lastWordBoundary, leadWidth + currMaxWidth); |
| lastWordBoundary = j; |
| } |
| |
| bool isSpace = (j < len) && isSpaceAccordingToStyle(c, style()); |
| bool isCollapsibleWhiteSpace = (j < len) && style()->isCollapsibleWhiteSpace(c); |
| if (j < len && style()->autoWrap()) |
| m_hasBreakableChar = true; |
| |
| // Add in wordSpacing to our currMaxWidth, but not if this is the last word on a line or the |
| // last word in the run. |
| if (wordSpacing && (isSpace || isCollapsibleWhiteSpace) && !containsOnlyWhitespace(j, len-j)) |
| currMaxWidth += wordSpacing; |
| |
| if (firstWord) { |
| firstWord = false; |
| // If the first character in the run is breakable, then we consider ourselves to have a beginning |
| // minimum width of 0, since a break could occur right before our run starts, preventing us from ever |
| // being appended to a previous text run when considering the total minimum width of the containing block. |
| if (hasBreak) |
| m_hasBreakableChar = true; |
| m_beginMinWidth = hasBreak ? 0 : w; |
| } |
| m_endMinWidth = w; |
| |
| if (currMinWidth > m_minWidth) |
| m_minWidth = currMinWidth; |
| currMinWidth = 0; |
| |
| i += wordLen - 1; |
| } else { |
| // Nowrap can never be broken, so don't bother setting the |
| // breakable character boolean. Pre can only be broken if we encounter a newline. |
| if (style()->autoWrap() || isNewline) |
| m_hasBreakableChar = true; |
| |
| if (currMinWidth > m_minWidth) |
| m_minWidth = currMinWidth; |
| currMinWidth = 0; |
| |
| if (isNewline) { // Only set if preserveNewline was true and we saw a newline. |
| if (firstLine) { |
| firstLine = false; |
| leadWidth = 0; |
| if (!style()->autoWrap()) |
| m_beginMinWidth = currMaxWidth; |
| } |
| |
| if (currMaxWidth > m_maxWidth) |
| m_maxWidth = currMaxWidth; |
| currMaxWidth = 0; |
| } else { |
| currMaxWidth += f.width(TextRun(txt + i, 1, allowTabs(), leadWidth + currMaxWidth)); |
| needsWordSpacing = isSpace && !previousCharacterIsSpace && i == len - 1; |
| } |
| ASSERT(lastWordBoundary == i); |
| lastWordBoundary++; |
| } |
| } |
| |
| if (needsWordSpacing && len > 1 || ignoringSpaces && !firstWord) |
| currMaxWidth += wordSpacing; |
| |
| m_minWidth = max(currMinWidth, m_minWidth); |
| m_maxWidth = max(currMaxWidth, m_maxWidth); |
| |
| if (!style()->autoWrap()) |
| m_minWidth = m_maxWidth; |
| |
| if (style()->whiteSpace() == PRE) { |
| if (firstLine) |
| m_beginMinWidth = m_maxWidth; |
| m_endMinWidth = currMaxWidth; |
| } |
| |
| setPrefWidthsDirty(false); |
| } |
| |
| bool RenderText::containsOnlyWhitespace(unsigned from, unsigned len) const |
| { |
| unsigned currPos; |
| for (currPos = from; |
| currPos < from + len && ((*m_text)[currPos] == '\n' || (*m_text)[currPos] == ' ' || (*m_text)[currPos] == '\t'); |
| currPos++) { } |
| return currPos >= (from + len); |
| } |
| |
| int RenderText::minXPos() const |
| { |
| if (!m_firstTextBox) |
| return 0; |
| |
| // FIXME: we should not use an arbitrary value like this. Perhaps we should use INT_MAX. |
| int minXPos = 6666666; |
| for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) |
| minXPos = min(minXPos, static_cast<int>(box->m_x)); |
| return minXPos; |
| } |
| |
| int RenderText::xPos() const |
| { |
| return m_firstTextBox ? m_firstTextBox->m_x : 0; |
| } |
| |
| int RenderText::yPos() const |
| { |
| return m_firstTextBox ? m_firstTextBox->m_y : 0; |
| } |
| |
| void RenderText::setSelectionState(SelectionState state) |
| { |
| InlineTextBox* box; |
| |
| m_selectionState = state; |
| if (state == SelectionStart || state == SelectionEnd || state == SelectionBoth) { |
| int startPos, endPos; |
| selectionStartEnd(startPos, endPos); |
| if (selectionState() == SelectionStart) { |
| endPos = textLength(); |
| |
| // to handle selection from end of text to end of line |
| if (startPos != 0 && startPos == endPos) |
| startPos = endPos - 1; |
| } else if (selectionState() == SelectionEnd) |
| startPos = 0; |
| |
| for (box = firstTextBox(); box; box = box->nextTextBox()) { |
| if (box->isSelected(startPos, endPos)) { |
| RootInlineBox* line = box->root(); |
| if (line) |
| line->setHasSelectedChildren(true); |
| } |
| } |
| } else { |
| for (box = firstTextBox(); box; box = box->nextTextBox()) { |
| RootInlineBox* line = box->root(); |
| if (line) |
| line->setHasSelectedChildren(state == SelectionInside); |
| } |
| } |
| |
| containingBlock()->setSelectionState(state); |
| } |
| |
| void RenderText::setTextWithOffset(PassRefPtr<StringImpl> text, unsigned offset, unsigned len, bool force) |
| { |
| unsigned oldLen = textLength(); |
| unsigned newLen = text->length(); |
| int delta = newLen - oldLen; |
| unsigned end = len ? offset + len - 1 : offset; |
| |
| RootInlineBox* firstRootBox = 0; |
| RootInlineBox* lastRootBox = 0; |
| |
| bool dirtiedLines = false; |
| |
| // Dirty all text boxes that include characters in between offset and offset+len. |
| for (InlineTextBox* curr = firstTextBox(); curr; curr = curr->nextTextBox()) { |
| // Text run is entirely before the affected range. |
| if (curr->end() < offset) |
| continue; |
| |
| // Text run is entirely after the affected range. |
| if (curr->start() > end) { |
| curr->offsetRun(delta); |
| RootInlineBox* root = curr->root(); |
| if (!firstRootBox) { |
| firstRootBox = root; |
| if (!dirtiedLines) { |
| // The affected area was in between two runs. Go ahead and mark the root box of |
| // the run after the affected area as dirty. |
| firstRootBox->markDirty(); |
| dirtiedLines = true; |
| } |
| } |
| lastRootBox = root; |
| } else if (curr->end() >= offset && curr->end() <= end) { |
| // Text run overlaps with the left end of the affected range. |
| curr->dirtyLineBoxes(); |
| dirtiedLines = true; |
| } else if (curr->start() <= offset && curr->end() >= end) { |
| // Text run subsumes the affected range. |
| curr->dirtyLineBoxes(); |
| dirtiedLines = true; |
| } else if (curr->start() <= end && curr->end() >= end) { |
| // Text run overlaps with right end of the affected range. |
| curr->dirtyLineBoxes(); |
| dirtiedLines = true; |
| } |
| } |
| |
| // Now we have to walk all of the clean lines and adjust their cached line break information |
| // to reflect our updated offsets. |
| if (lastRootBox) |
| lastRootBox = lastRootBox->nextRootBox(); |
| if (firstRootBox) { |
| RootInlineBox* prev = firstRootBox->prevRootBox(); |
| if (prev) |
| firstRootBox = prev; |
| } |
| for (RootInlineBox* curr = firstRootBox; curr && curr != lastRootBox; curr = curr->nextRootBox()) { |
| if (curr->lineBreakObj() == this && curr->lineBreakPos() > end) |
| curr->setLineBreakPos(curr->lineBreakPos() + delta); |
| } |
| |
| m_linesDirty = dirtiedLines; |
| setText(text, force); |
| } |
| |
| static inline bool isInlineFlowOrEmptyText(RenderObject* o) |
| { |
| if (o->isInlineFlow()) |
| return true; |
| if (!o->isText()) |
| return false; |
| StringImpl* text = static_cast<RenderText*>(o)->text(); |
| if (!text) |
| return true; |
| return !text->length(); |
| } |
| |
| UChar RenderText::previousCharacter() |
| { |
| // find previous text renderer if one exists |
| RenderObject* previousText = this; |
| while ((previousText = previousText->previousInPreOrder())) |
| if (!isInlineFlowOrEmptyText(previousText)) |
| break; |
| UChar prev = ' '; |
| if (previousText && previousText->isText()) |
| if (StringImpl* previousString = static_cast<RenderText*>(previousText)->text()) |
| prev = (*previousString)[previousString->length() - 1]; |
| return prev; |
| } |
| |
| void RenderText::setTextInternal(PassRefPtr<StringImpl> text) |
| { |
| m_text = text; |
| ASSERT(m_text); |
| |
| m_text = m_text->replace('\\', backslashAsCurrencySymbol()); |
| |
| #if ENABLE(SVG) |
| if (isSVGText()) { |
| if (style() && style()->whiteSpace() == PRE) { |
| // Spec: When xml:space="preserve", the SVG user agent will do the following using a |
| // copy of the original character data content. It will convert all newline and tab |
| // characters into space characters. Then, it will draw all space characters, including |
| // leading, trailing and multiple contiguous space characters. |
| |
| m_text = m_text->replace('\n', ' '); |
| |
| // If xml:space="preserve" is set, white-space is set to "pre", which |
| // preserves leading, trailing & contiguous space character for us. |
| } else { |
| // Spec: When xml:space="default", the SVG user agent will do the following using a |
| // copy of the original character data content. First, it will remove all newline |
| // characters. Then it will convert all tab characters into space characters. |
| // Then, it will strip off all leading and trailing space characters. |
| // Then, all contiguous space characters will be consolidated. |
| |
| m_text = m_text->replace('\n', StringImpl::empty()); |
| |
| // If xml:space="default" is set, white-space is set to "nowrap", which handles |
| // leading, trailing & contiguous space character removal for us. |
| } |
| |
| m_text = m_text->replace('\t', ' '); |
| } |
| #endif |
| |
| if (style()) { |
| switch (style()->textTransform()) { |
| case TTNONE: |
| break; |
| case CAPITALIZE: { |
| m_text = m_text->capitalize(previousCharacter()); |
| break; |
| } |
| case UPPERCASE: |
| m_text = m_text->upper(); |
| break; |
| case LOWERCASE: |
| m_text = m_text->lower(); |
| break; |
| } |
| |
| // We use the same characters here as for list markers. |
| // See the listMarkerText function in RenderListMarker.cpp. |
| switch (style()->textSecurity()) { |
| case TSNONE: |
| break; |
| case TSCIRCLE: |
| m_text = m_text->secure(whiteBullet); |
| break; |
| case TSDISC: |
| m_text = m_text->secure(bullet); |
| break; |
| case TSSQUARE: |
| m_text = m_text->secure(blackSquare); |
| } |
| } |
| |
| ASSERT(m_text); |
| ASSERT(!isBR() || (textLength() == 1 && (*m_text)[0] == '\n')); |
| |
| m_isAllASCII = charactersAreAllASCII(m_text.get()); |
| } |
| |
| void RenderText::setText(PassRefPtr<StringImpl> text, bool force) |
| { |
| ASSERT(text); |
| |
| if (!force && equal(m_text.get(), text.get())) |
| return; |
| |
| setTextInternal(text); |
| setNeedsLayoutAndPrefWidthsRecalc(); |
| } |
| |
| int RenderText::height() const |
| { |
| int retval = 0; |
| if (firstTextBox()) |
| retval = lastTextBox()->m_y + lastTextBox()->height() - firstTextBox()->m_y; |
| return retval; |
| } |
| |
| short RenderText::lineHeight(bool firstLine, bool) const |
| { |
| // Always use the interior line height of the parent (e.g., if our parent is an inline block). |
| return parent()->lineHeight(firstLine, true); |
| } |
| |
| void RenderText::dirtyLineBoxes(bool fullLayout, bool) |
| { |
| if (fullLayout) |
| deleteTextBoxes(); |
| else if (!m_linesDirty) { |
| for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) |
| box->dirtyLineBoxes(); |
| } |
| m_linesDirty = false; |
| } |
| |
| InlineTextBox* RenderText::createInlineTextBox() |
| { |
| return new (renderArena()) InlineTextBox(this); |
| } |
| |
| InlineBox* RenderText::createInlineBox(bool, bool isRootLineBox, bool) |
| { |
| ASSERT(!isRootLineBox); |
| InlineTextBox* textBox = createInlineTextBox(); |
| if (!m_firstTextBox) |
| m_firstTextBox = m_lastTextBox = textBox; |
| else { |
| m_lastTextBox->setNextLineBox(textBox); |
| textBox->setPreviousLineBox(m_lastTextBox); |
| m_lastTextBox = textBox; |
| } |
| return textBox; |
| } |
| |
| void RenderText::position(InlineBox* box) |
| { |
| InlineTextBox* s = static_cast<InlineTextBox*>(box); |
| |
| // FIXME: should not be needed!!! |
| if (!s->m_len) { |
| // We want the box to be destroyed. |
| s->remove(); |
| s->destroy(renderArena()); |
| m_firstTextBox = m_lastTextBox = 0; |
| return; |
| } |
| |
| m_containsReversedText |= s->m_reversed; |
| } |
| |
| unsigned int RenderText::width(unsigned int from, unsigned int len, int xPos, bool firstLine) const |
| { |
| if (from >= textLength()) |
| return 0; |
| |
| if (from + len > textLength()) |
| len = textLength() - from; |
| |
| return width(from, len, style(firstLine)->font(), xPos); |
| } |
| |
| unsigned int RenderText::width(unsigned int from, unsigned int len, const Font& f, int xPos) const |
| { |
| if (!characters() || from > textLength()) |
| return 0; |
| |
| if (from + len > textLength()) |
| len = textLength() - from; |
| |
| int w; |
| if (&f == &style()->font()) { |
| if (!style()->preserveNewline() && !from && len == textLength()) |
| w = maxPrefWidth(); |
| else |
| w = widthFromCache(f, from, len, xPos); |
| } else |
| w = f.width(TextRun(text()->characters() + from, len, allowTabs(), xPos)); |
| |
| return w; |
| } |
| |
| int RenderText::width() const |
| { |
| // FIXME: we should not use an arbitrary value like this. Perhaps we should use INT_MAX. |
| int minx = 100000000; |
| int maxx = 0; |
| // slooow |
| for (InlineTextBox* s = firstTextBox(); s; s = s->nextTextBox()) { |
| if (s->m_x < minx) |
| minx = s->m_x; |
| if (s->m_x + s->m_width > maxx) |
| maxx = s->m_x + s->m_width; |
| } |
| |
| return max(0, maxx - minx); |
| } |
| |
| IntRect RenderText::absoluteClippedOverflowRect() |
| { |
| RenderObject* cb = containingBlock(); |
| return cb->absoluteClippedOverflowRect(); |
| } |
| |
| IntRect RenderText::selectionRect(bool clipToVisibleContent) |
| { |
| ASSERT(!needsLayout()); |
| |
| IntRect rect; |
| if (selectionState() == SelectionNone) |
| return rect; |
| RenderBlock* cb = containingBlock(); |
| if (!cb) |
| return rect; |
| |
| // Now calculate startPos and endPos for painting selection. |
| // We include a selection while endPos > 0 |
| int startPos, endPos; |
| if (selectionState() == SelectionInside) { |
| // We are fully selected. |
| startPos = 0; |
| endPos = textLength(); |
| } else { |
| selectionStartEnd(startPos, endPos); |
| if (selectionState() == SelectionStart) |
| endPos = textLength(); |
| else if (selectionState() == SelectionEnd) |
| startPos = 0; |
| } |
| |
| if (startPos == endPos) |
| return rect; |
| |
| for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) |
| rect.unite(box->selectionRect(0, 0, startPos, endPos)); |
| |
| if (clipToVisibleContent) |
| computeAbsoluteRepaintRect(rect); |
| else { |
| if (cb->hasColumns()) |
| cb->adjustRectForColumns(rect); |
| int absx, absy; |
| absolutePosition(absx, absy); |
| rect.move(absx, absy); |
| } |
| |
| return rect; |
| } |
| |
| short RenderText::verticalPositionHint(bool firstLine) const |
| { |
| if (parent()->isReplaced()) |
| return 0; // Treat inline blocks just like blocks. There can't be any vertical position hint. |
| return parent()->verticalPositionHint(firstLine); |
| } |
| |
| int RenderText::caretMinOffset() const |
| { |
| InlineTextBox* box = firstTextBox(); |
| if (!box) |
| return 0; |
| int minOffset = box->m_start; |
| for (box = box->nextTextBox(); box; box = box->nextTextBox()) |
| minOffset = min(minOffset, box->m_start); |
| return minOffset; |
| } |
| |
| int RenderText::caretMaxOffset() const |
| { |
| InlineTextBox* box = lastTextBox(); |
| if (!box) |
| return textLength(); |
| int maxOffset = box->m_start + box->m_len; |
| for (box = box->prevTextBox(); box; box = box->prevTextBox()) |
| maxOffset = max(maxOffset, box->m_start + box->m_len); |
| return maxOffset; |
| } |
| |
| unsigned RenderText::caretMaxRenderedOffset() const |
| { |
| int l = 0; |
| for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) |
| l += box->m_len; |
| return l; |
| } |
| |
| int RenderText::previousOffset(int current) const |
| { |
| StringImpl* si = m_text.get(); |
| TextBreakIterator* iterator = characterBreakIterator(si->characters(), si->length()); |
| if (!iterator) |
| return current - 1; |
| |
| long result = textBreakPreceding(iterator, current); |
| if (result == TextBreakDone) |
| result = current - 1; |
| |
| return result; |
| } |
| |
| int RenderText::nextOffset(int current) const |
| { |
| StringImpl* si = m_text.get(); |
| TextBreakIterator* iterator = characterBreakIterator(si->characters(), si->length()); |
| if (!iterator) |
| return current + 1; |
| |
| long result = textBreakFollowing(iterator, current); |
| if (result == TextBreakDone) |
| result = current + 1; |
| |
| return result; |
| } |
| |
| InlineBox* RenderText::inlineBox(int offset, EAffinity affinity) |
| { |
| for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) { |
| if (box->containsCaretOffset(offset)) { |
| if (atLineWrap(box, offset) && affinity == DOWNSTREAM) |
| return box->nextTextBox(); |
| return box; |
| } |
| if (offset < box->m_start) |
| // The offset we're looking for is before this node |
| // this means the offset must be in content that is |
| // not rendered. |
| return box->prevTextBox() ? box->prevTextBox() : firstTextBox(); |
| } |
| |
| return 0; |
| } |
| |
| #ifndef NDEBUG |
| |
| void RenderText::checkConsistency() const |
| { |
| #ifdef CHECK_CONSISTENCY |
| const InlineTextBox* prev = 0; |
| for (const InlineTextBox* child = m_firstTextBox; child != 0; child = child->nextTextBox()) { |
| ASSERT(child->object() == this); |
| ASSERT(child->prevTextBox() == prev); |
| prev = child; |
| } |
| ASSERT(prev == m_lastTextBox); |
| #endif |
| } |
| |
| #endif |
| |
| } // namespace WebCore |
