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Issue #116: Navigate to text

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This commit is contained in:
Jakub Melka
2023-12-02 15:40:11 +01:00
parent a892c192fc
commit 288eead65e
6 changed files with 175 additions and 70 deletions
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145
Pdf4QtLib/sources/pdftextlayout.cpp
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@ -966,6 +966,82 @@ void PDFTextBlock::applyTransform(const QTransform& matrix)
}
}
QPainterPath PDFTextBlock::getCharacterRangeBoundingPath(const PDFCharacterPointer& start,
const PDFCharacterPointer& end,
const QTransform& matrix,
PDFReal heightIncreaseFactor) const
{
QPainterPath path;
PDFTextBlock block = *this;
// Fix angle of block, so we will get correct selection rectangles (parallel to lines)
QTransform angleMatrix;
angleMatrix.rotate(block.getAngle());
block.applyTransform(angleMatrix);
const size_t lineStart = start.lineIndex;
const size_t lineEnd = end.lineIndex;
Q_ASSERT(lineEnd >= lineStart);
const PDFTextLines& lines = block.getLines();
for (size_t lineIndex = lineStart; lineIndex <= lineEnd; ++lineIndex)
{
if (lineIndex >= lines.size())
{
// Selection is invalid, do nothing
continue;
}
const PDFTextLine& line = lines[lineIndex];
const TextCharacters& characters = line.getCharacters();
if (characters.empty())
{
// Selection is invalid, do nothing
continue;
}
// First determine, which characters will be selected
size_t characterStart = 0;
size_t characterEnd = characters.size() - 1;
if (lineIndex == lineStart)
{
characterStart = start.characterIndex;
}
if (lineIndex == lineEnd)
{
characterEnd = end.characterIndex;
}
// Validate indices, then calculate bounding box
if (!(characterStart <= characterEnd && characterEnd < characters.size()))
{
continue;
}
QRectF boundingBox;
for (size_t i = characterStart; i <= characterEnd; ++i)
{
boundingBox = boundingBox.united(characters[i].boundingBox.boundingRect());
}
if (boundingBox.isValid())
{
// Enlarge height by some percent
PDFReal heightAdvance = boundingBox.height() * heightIncreaseFactor * 0.5;
boundingBox.adjust(0, -heightAdvance, 0, heightAdvance);
path.addRect(boundingBox);
}
}
QTransform transformMatrix = angleMatrix.inverted() * matrix;
path = transformMatrix.map(path);
return path;
}
QDataStream& operator>>(QDataStream& stream, PDFTextBlock& block)
{
stream >> block.m_lines;
@ -1459,73 +1535,8 @@ void PDFTextSelectionPainter::draw(QPainter* painter, PDFInteger pageIndex, PDFT
continue;
}
PDFTextBlock block = blocks[start.blockIndex];
// Fix angle of block, so we will get correct selection rectangles (parallel to lines)
QTransform angleMatrix;
angleMatrix.rotate(block.getAngle());
block.applyTransform(angleMatrix);
QPainterPath path;
const size_t lineStart = start.lineIndex;
const size_t lineEnd = end.lineIndex;
Q_ASSERT(lineEnd >= lineStart);
const PDFTextLines& lines = block.getLines();
for (size_t lineIndex = lineStart; lineIndex <= lineEnd; ++lineIndex)
{
if (lineIndex >= lines.size())
{
// Selection is invalid, do nothing
continue;
}
const PDFTextLine& line = lines[lineIndex];
const TextCharacters& characters = line.getCharacters();
if (characters.empty())
{
// Selection is invalid, do nothing
continue;
}
// First determine, which characters will be selected
size_t characterStart = 0;
size_t characterEnd = characters.size() - 1;
if (lineIndex == lineStart)
{
characterStart = start.characterIndex;
}
if (lineIndex == lineEnd)
{
characterEnd = end.characterIndex;
}
// Validate indices, then calculate bounding box
if (!(characterStart <= characterEnd && characterEnd < characters.size()))
{
continue;
}
QRectF boundingBox;
for (size_t i = characterStart; i <= characterEnd; ++i)
{
boundingBox = boundingBox.united(characters[i].boundingBox.boundingRect());
}
if (boundingBox.isValid())
{
// Enlarge height by some percent
PDFReal heightAdvance = boundingBox.height() * HEIGHT_INCREASE_FACTOR * 0.5;
boundingBox.adjust(0, -heightAdvance, 0, heightAdvance);
path.addRect(boundingBox);
}
}
QTransform transformMatrix = angleMatrix.inverted() * matrix;
path = transformMatrix.map(path);
const PDFTextBlock& block = blocks[start.blockIndex];
QPainterPath path = block.getCharacterRangeBoundingPath(start, end, matrix, HEIGHT_INCREASE_FACTOR);
QColor penColor = item.color.darker();
QColor brushColor = item.color;