SkPlainTextEditor::Editor Class Reference

#include <editor.h>

Classes
struct	PaintOpts
struct	Text
struct	TextPosition

Public Types
enum class	Movement {   kNowhere , kLeft , kUp , kRight ,   kDown , kHome , kEnd , kWordLeft ,   kWordRight }

Public Member Functions
int	getHeight () const
void	setWidth (int w)
const SkFont &	font () const
void	setFont (SkFont font)
void	setFontMgr (sk_sp< SkFontMgr > fontMgr)
Text	text () const
int	lineHeight (size_t index) const
TextPosition	move (Editor::Movement move, Editor::TextPosition pos) const
TextPosition	getPosition (SkIPoint)
SkRect	getLocation (TextPosition)
TextPosition	insert (TextPosition, const char *utf8Text, size_t byteLen)
TextPosition	remove (TextPosition, TextPosition)
size_t	copy (TextPosition pos1, TextPosition pos2, char *dst=nullptr) const
size_t	lineCount () const
StringView	line (size_t i) const
void	paint (SkCanvas *canvas, PaintOpts)

Detailed Description

Definition at line 26 of file editor.h.

Member Enumeration Documentation

Movement

enum class SkPlainTextEditor::Editor::Movement

strong

Enumerator
kNowhere
kLeft
kUp
kRight
kDown
kHome
kEnd
kWordLeft
kWordRight

Definition at line 66 of file editor.h.

                        {
        kNowhere,
        kLeft,
        kUp,
        kRight,
        kDown,
        kHome,
        kEnd,
        kWordLeft,
        kWordRight,
    };

Member Function Documentation

copy()

size_t Editor::copy	(	TextPosition	pos1,
		TextPosition	pos2,
		char *	dst = nullptr
	)		const

Definition at line 219 of file editor.cpp.

                                                                         {
    size_t size = 0;
    pos1 = this->move(Editor::Movement::kNowhere, pos1);
    pos2 = this->move(Editor::Movement::kNowhere, pos2);
    auto cmp = [](const Editor::TextPosition& u, const Editor::TextPosition& v) { return u < v; };
    Editor::TextPosition start = std::min(pos1, pos2, cmp);
    Editor::TextPosition end = std::max(pos1, pos2, cmp);
    if (start == end || start.fParagraphIndex == fLines.size()) {
        return size;
    }
    if (start.fParagraphIndex == end.fParagraphIndex) {
        SkASSERT(end.fTextByteIndex > start.fTextByteIndex);
        auto& str = fLines[start.fParagraphIndex].fText;
        append(&dst, &size, str.begin() + start.fTextByteIndex,
               end.fTextByteIndex - start.fTextByteIndex);
        return size;
    }
    SkASSERT(end.fParagraphIndex < fLines.size());
    const std::vector<TextLine>::const_iterator firstP = fLines.begin() + start.fParagraphIndex;
    const std::vector<TextLine>::const_iterator lastP  = fLines.begin() + end.fParagraphIndex;
    const auto& first = firstP->fText;
    const auto& last  = lastP->fText;
 
    append(&dst, &size, first.begin() + start.fTextByteIndex, first.size() - start.fTextByteIndex);
    for (auto line = firstP + 1; line < lastP; ++line) {
        append(&dst, &size, "\n", 1);
        append(&dst, &size, line->fText.begin(), line->fText.size());
    }
    append(&dst, &size, "\n", 1);
    append(&dst, &size, last.begin(), end.fTextByteIndex);
    return size;
}

font()

const SkFont & SkPlainTextEditor::Editor::font ( ) const

inline

Definition at line 36 of file editor.h.

{ return fFont; }

getHeight()

int SkPlainTextEditor::Editor::getHeight ( ) const

inline

Definition at line 30 of file editor.h.

{ return fHeight; }

getLocation()

SkRect Editor::getLocation

(

Editor::TextPosition

cursor

)

Definition at line 131 of file editor.cpp.

                                                    {
    this->reshapeAll();
    cursor = this->move(Editor::Movement::kNowhere, cursor);
    if (fLines.size() > 0) {
        const TextLine& cLine = fLines[cursor.fParagraphIndex];
        SkRect pos = {0, 0, 0, 0};
        if (cursor.fTextByteIndex < cLine.fCursorPos.size()) {
            pos = cLine.fCursorPos[cursor.fTextByteIndex];
        }
        pos.fRight = pos.fLeft + 1;
        pos.fLeft -= 1;
        return offset(pos, cLine.fOrigin);
    }
    return SkRect{0, 0, 0, 0};
}

getPosition()

Editor::TextPosition Editor::getPosition

(

SkIPoint

xy

)

Definition at line 77 of file editor.cpp.

                                                  {
    Editor::TextPosition approximatePosition;
    this->reshapeAll();
    for (size_t j = 0; j < fLines.size(); ++j) {
        const TextLine& line = fLines[j];
        SkIRect lineRect = {0,
                            line.fOrigin.y(),
                            fWidth,
                            j + 1 < fLines.size() ? fLines[j + 1].fOrigin.y() : INT_MAX};
        if (const SkTextBlob* b = line.fBlob.get()) {
            SkIRect r = b->bounds().roundOut();
            r.offset(line.fOrigin);
            lineRect.join(r);
        }
        if (!lineRect.contains(xy.x(), xy.y())) {
            continue;
        }
        SkPoint pt = to_point(xy - line.fOrigin);
        const std::vector<SkRect>& pos = line.fCursorPos;
        for (size_t i = 0; i < pos.size(); ++i) {
            if (pos[i] != kUnsetRect && pos[i].contains(pt.x(), pt.y())) {
                return Editor::TextPosition{i, j};
            }
        }
        approximatePosition = {xy.x() <= line.fOrigin.x() ? 0 : line.fText.size(), j};
    }
    return approximatePosition;
}

insert()

Editor::TextPosition Editor::insert	(	TextPosition	pos,
		const char *	utf8Text,
		size_t	byteLen
	)

Definition at line 153 of file editor.cpp.

                                                                                        {
    if (!valid_utf8(utf8Text, byteLen) || 0 == byteLen) {
        return pos;
    }
    pos = this->move(Editor::Movement::kNowhere, pos);
    fNeedsReshape = true;
    if (pos.fParagraphIndex < fLines.size()) {
        fLines[pos.fParagraphIndex].fText.insert(pos.fTextByteIndex, utf8Text, byteLen);
        this->markDirty(&fLines[pos.fParagraphIndex]);
    } else {
        SkASSERT(pos.fParagraphIndex == fLines.size());
        SkASSERT(pos.fTextByteIndex == 0);
        fLines.push_back(Editor::TextLine(StringSlice(utf8Text, byteLen)));
    }
    pos = Editor::TextPosition{pos.fTextByteIndex + byteLen, pos.fParagraphIndex};
    size_t newlinecount = count_char(fLines[pos.fParagraphIndex].fText, '\n');
    if (newlinecount > 0) {
        StringSlice src = std::move(fLines[pos.fParagraphIndex].fText);
        std::vector<TextLine>::const_iterator next = fLines.begin() + pos.fParagraphIndex + 1;
        fLines.insert(next, newlinecount, TextLine());
        TextLine* line = &fLines[pos.fParagraphIndex];
        readlines(src.begin(), src.size(), [&line](const char* str, size_t l) {
            (line++)->fText = remove_newline(str, l);
        });
    }
    return pos;
}

line()

StringView SkPlainTextEditor::Editor::line ( size_t  i ) const

inline

Definition at line 89 of file editor.h.

                                    {
        return i < fLines.size() ? fLines[i].fText.view() : StringView{nullptr, 0};
    }

lineCount()

size_t SkPlainTextEditor::Editor::lineCount ( ) const

inline

Definition at line 88 of file editor.h.

{ return fLines.size(); }

lineHeight()

int SkPlainTextEditor::Editor::lineHeight ( size_t  index ) const

inline

Definition at line 60 of file editor.h.

{ return fLines[index].fHeight; }

move()

Editor::TextPosition Editor::move	(	Editor::Movement	move,
		Editor::TextPosition	pos
	)		const

Definition at line 287 of file editor.cpp.

                                                                                 {
    if (fLines.empty()) {
        return {0, 0};
    }
    // First thing: fix possible bad input values.
    if (pos.fParagraphIndex >= fLines.size()) {
        pos.fParagraphIndex = fLines.size() - 1;
        pos.fTextByteIndex = fLines[pos.fParagraphIndex].fText.size();
    } else {
        pos.fTextByteIndex = align_column(fLines[pos.fParagraphIndex].fText, pos.fTextByteIndex);
    }
 
    SkASSERT(pos.fParagraphIndex < fLines.size());
    SkASSERT(pos.fTextByteIndex <= fLines[pos.fParagraphIndex].fText.size());
 
    SkASSERT(pos.fTextByteIndex == fLines[pos.fParagraphIndex].fText.size() ||
             !is_utf8_continuation(fLines[pos.fParagraphIndex].fText.begin()[pos.fTextByteIndex]));
 
    switch (move) {
        case Editor::Movement::kNowhere:
            break;
        case Editor::Movement::kLeft:
            if (0 == pos.fTextByteIndex) {
                if (pos.fParagraphIndex > 0) {
                    --pos.fParagraphIndex;
                    pos.fTextByteIndex = fLines[pos.fParagraphIndex].fText.size();
                }
            } else {
                const auto& str = fLines[pos.fParagraphIndex].fText;
                pos.fTextByteIndex =
                    prev_utf8(begin(str) + pos.fTextByteIndex, begin(str)) - begin(str);
            }
            break;
        case Editor::Movement::kRight:
            if (fLines[pos.fParagraphIndex].fText.size() == pos.fTextByteIndex) {
                if (pos.fParagraphIndex + 1 < fLines.size()) {
                    ++pos.fParagraphIndex;
                    pos.fTextByteIndex = 0;
                }
            } else {
                const auto& str = fLines[pos.fParagraphIndex].fText;
                pos.fTextByteIndex =
                    next_utf8(begin(str) + pos.fTextByteIndex, end(str)) - begin(str);
            }
            break;
        case Editor::Movement::kHome:
            {
                const std::vector<size_t>& list = fLines[pos.fParagraphIndex].fLineEndOffsets;
                size_t f = find_first_larger(list, pos.fTextByteIndex);
                pos.fTextByteIndex = f > 0 ? list[f - 1] : 0;
            }
            break;
        case Editor::Movement::kEnd:
            {
                const std::vector<size_t>& list = fLines[pos.fParagraphIndex].fLineEndOffsets;
                size_t f = find_first_larger(list, pos.fTextByteIndex);
                if (f < list.size()) {
                    pos.fTextByteIndex = list[f] > 0 ? list[f] - 1 : 0;
                } else {
                    pos.fTextByteIndex = fLines[pos.fParagraphIndex].fText.size();
                }
            }
            break;
        case Editor::Movement::kUp:
            {
                SkASSERT(pos.fTextByteIndex < fLines[pos.fParagraphIndex].fCursorPos.size());
                float x = fLines[pos.fParagraphIndex].fCursorPos[pos.fTextByteIndex].left();
                const std::vector<size_t>& list = fLines[pos.fParagraphIndex].fLineEndOffsets;
                size_t f = find_first_larger(list, pos.fTextByteIndex);
                // list[f] > value.  value > list[f-1]
                if (f > 0) {
                    // not the first line in paragraph.
                    pos.fTextByteIndex = find_closest_x(fLines[pos.fParagraphIndex].fCursorPos, x,
                                                        (f == 1) ? 0 : list[f - 2],
                                                        list[f - 1]);
                } else if (pos.fParagraphIndex > 0) {
                    --pos.fParagraphIndex;
                    const auto& newLine = fLines[pos.fParagraphIndex];
                    size_t r = newLine.fLineEndOffsets.size();
                    if (r > 0) {
                        pos.fTextByteIndex = find_closest_x(newLine.fCursorPos, x,
                                                            newLine.fLineEndOffsets[r - 1],
                                                            newLine.fCursorPos.size());
                    } else {
                        pos.fTextByteIndex = find_closest_x(newLine.fCursorPos, x, 0,
                                                            newLine.fCursorPos.size());
                    }
                }
                pos.fTextByteIndex =
                    align_column(fLines[pos.fParagraphIndex].fText, pos.fTextByteIndex);
            }
            break;
        case Editor::Movement::kDown:
            {
                const std::vector<size_t>& list = fLines[pos.fParagraphIndex].fLineEndOffsets;
                float x = fLines[pos.fParagraphIndex].fCursorPos[pos.fTextByteIndex].left();
 
                size_t f = find_first_larger(list, pos.fTextByteIndex);
                if (f < list.size()) {
                    const auto& bounds = fLines[pos.fParagraphIndex].fCursorPos;
                    pos.fTextByteIndex = find_closest_x(bounds, x, list[f],
                                                        f + 1 < list.size() ? list[f + 1]
                                                                            : bounds.size());
                } else if (pos.fParagraphIndex + 1 < fLines.size()) {
                    ++pos.fParagraphIndex;
                    const auto& bounds = fLines[pos.fParagraphIndex].fCursorPos;
                    const std::vector<size_t>& l2 = fLines[pos.fParagraphIndex].fLineEndOffsets;
                    pos.fTextByteIndex = find_closest_x(bounds, x, 0,
                                                        l2.size() > 0 ? l2[0] : bounds.size());
                } else {
                    pos.fTextByteIndex = fLines[pos.fParagraphIndex].fText.size();
                }
                pos.fTextByteIndex =
                    align_column(fLines[pos.fParagraphIndex].fText, pos.fTextByteIndex);
            }
            break;
        case Editor::Movement::kWordLeft:
            {
                if (pos.fTextByteIndex == 0) {
                    pos = this->move(Editor::Movement::kLeft, pos);
                    break;
                }
                const std::vector<bool>& words = fLines[pos.fParagraphIndex].fWordBoundaries;
                SkASSERT(words.size() == fLines[pos.fParagraphIndex].fText.size());
                do {
                    --pos.fTextByteIndex;
                } while (pos.fTextByteIndex > 0 && !words[pos.fTextByteIndex]);
            }
            break;
        case Editor::Movement::kWordRight:
            {
                const StringSlice& text = fLines[pos.fParagraphIndex].fText;
                if (pos.fTextByteIndex == text.size()) {
                    pos = this->move(Editor::Movement::kRight, pos);
                    break;
                }
                const std::vector<bool>& words = fLines[pos.fParagraphIndex].fWordBoundaries;
                SkASSERT(words.size() == text.size());
                do {
                    ++pos.fTextByteIndex;
                } while (pos.fTextByteIndex < text.size() && !words[pos.fTextByteIndex]);
            }
            break;
 
    }
    return pos;
}

paint()

void Editor::paint	(	SkCanvas *	canvas,
		PaintOpts	options
	)

Definition at line 435 of file editor.cpp.

                                                 {
    this->reshapeAll();
    if (!c) {
        return;
    }
 
    c->drawPaint(SkPaint(options.fBackgroundColor));
 
    SkPaint selection = SkPaint(options.fSelectionColor);
    auto cmp = [](const Editor::TextPosition& u, const Editor::TextPosition& v) { return u < v; };
    for (TextPosition pos = std::min(options.fSelectionBegin, options.fSelectionEnd, cmp),
                      end = std::max(options.fSelectionBegin, options.fSelectionEnd, cmp);
         pos < end;
         pos = this->move(Editor::Movement::kRight, pos))
    {
        SkASSERT(pos.fParagraphIndex < fLines.size());
        const TextLine& l = fLines[pos.fParagraphIndex];
        c->drawRect(offset(l.fCursorPos[pos.fTextByteIndex], l.fOrigin), selection);
    }
 
    if (fLines.size() > 0) {
        c->drawRect(Editor::getLocation(options.fCursor), SkPaint(options.fCursorColor));
    }
 
    SkPaint foreground = SkPaint(options.fForegroundColor);
    for (const TextLine& line : fLines) {
        if (line.fBlob) {
            c->drawTextBlob(line.fBlob.get(), line.fOrigin.x(), line.fOrigin.y(), foreground);
        }
    }
}

remove()

Editor::TextPosition Editor::remove	(	TextPosition	pos1,
		TextPosition	pos2
	)

Definition at line 181 of file editor.cpp.

                                                                      {
    pos1 = this->move(Editor::Movement::kNowhere, pos1);
    pos2 = this->move(Editor::Movement::kNowhere, pos2);
    auto cmp = [](const Editor::TextPosition& u, const Editor::TextPosition& v) { return u < v; };
    Editor::TextPosition start = std::min(pos1, pos2, cmp);
    Editor::TextPosition end = std::max(pos1, pos2, cmp);
    if (start == end || start.fParagraphIndex == fLines.size()) {
        return start;
    }
    fNeedsReshape = true;
    if (start.fParagraphIndex == end.fParagraphIndex) {
        SkASSERT(end.fTextByteIndex > start.fTextByteIndex);
        fLines[start.fParagraphIndex].fText.remove(
                start.fTextByteIndex, end.fTextByteIndex - start.fTextByteIndex);
        this->markDirty(&fLines[start.fParagraphIndex]);
    } else {
        SkASSERT(end.fParagraphIndex < fLines.size());
        auto& line = fLines[start.fParagraphIndex];
        line.fText.remove(start.fTextByteIndex,
                          line.fText.size() - start.fTextByteIndex);
        line.fText.insert(start.fTextByteIndex,
                          fLines[end.fParagraphIndex].fText.begin() + end.fTextByteIndex,
                          fLines[end.fParagraphIndex].fText.size() - end.fTextByteIndex);
        this->markDirty(&line);
        fLines.erase(fLines.begin() + start.fParagraphIndex + 1,
                     fLines.begin() + end.fParagraphIndex + 1);
    }
    return start;
}

setFont()

void Editor::setFont

(

SkFont

font

)

Definition at line 54 of file editor.cpp.

                                {
    if (font != fFont) {
        fFont = std::move(font);
        fNeedsReshape = true;
        for (auto& l : fLines) { this->markDirty(&l); }
    }
}

setFontMgr()

void Editor::setFontMgr

(

sk_sp< SkFontMgr >

fontMgr

)

Definition at line 62 of file editor.cpp.

                                                {
    fFontMgr = fontMgr;
    fNeedsReshape = true;
    for (auto& l : fLines) { this->markDirty(&l); }
}

setWidth()

void Editor::setWidth

(

int

w

)

Definition at line 68 of file editor.cpp.

                           {
    if (fWidth != w) {
        fWidth = w;
        fNeedsReshape = true;
        for (auto& l : fLines) { this->markDirty(&l); }
    }
}

text()

Text SkPlainTextEditor::Editor::text ( ) const

inline

Definition at line 57 of file editor.h.

{ return Text{fLines}; }

---

The documentation for this class was generated from the following files:

• third_party/skia/modules/skplaintexteditor/include/editor.h
• third_party/skia/modules/skplaintexteditor/src/editor.cpp