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#include <QtGui>
#include "editor.h"
Editor::Editor() : QPlainTextEdit(),
folded(false)
{
document()->setDocumentLayout(new EditorLayout(document()));
setPlainText(
"int main(int argc, char **args)\n"
"{\n"
"\tqDebug() << \"Folding Code Example\";\n"
"\treturn 0;\n"
"}\n"
"\n"
"#include main.moc"
);
connect(this, SIGNAL(cursorPositionChanged()), this, SLOT(updateCursorPosition()));
}
void Editor::paintEvent(QPaintEvent *event)
{
if (folded) {
QTextBlock foldedBlock = document()->findBlockByNumber(1);
if (!foldedBlock.isValid() || !foldedBlock.isVisible())
return;
qreal top = blockBoundingGeometry(foldedBlock).translated(contentOffset()).top();
QTextLayout *layout = foldedBlock.layout();
QTextLine line = layout->lineAt(layout->lineCount()-1);
QRectF lineRect = line.naturalTextRect().translated(0, top);
lineRect.adjust(0, 0, -1, -1);
QRectF collapseRect(lineRect.right() + 12,
lineRect.top(),
fontMetrics().width(QLatin1String(" ...} ")),
lineRect.height());
QPainter painter(viewport());
painter.setRenderHint(QPainter::Antialiasing, true);
painter.translate(.5, .5);
painter.drawRoundedRect(collapseRect.adjusted(0, 0, 0, -1), 3, 3);
painter.translate(-.5, -.5);
painter.drawText(collapseRect, Qt::AlignCenter, "...}");
}
QPlainTextEdit::paintEvent(event);
}
QTextBlock Editor::foldedBlockAt(const QPoint &pos)
{
QTextBlock block = firstVisibleBlock();
qreal top = blockBoundingGeometry(block).translated(contentOffset()).top();
qreal bottom = top + blockBoundingRect(block).height();
int viewportHeight = viewport()->height();
while (block.isValid() && top <= viewportHeight) {
QTextBlock nextBlock = block.next();
if (block.isVisible() && bottom >= 0) {
if (nextBlock.isValid() && !nextBlock.isVisible()) {
QTextLayout *layout = block.layout();
QTextLine line = layout->lineAt(layout->lineCount()-1);
QRectF lineRect = line.naturalTextRect().translated(0, top);
lineRect.adjust(0, 0, -1, -1);
QRectF collapseRect(lineRect.right() + 12,
lineRect.top(),
fontMetrics().width(QLatin1String(" ...} ")),
lineRect.height());
if (collapseRect.contains(pos)) {
QTextBlock result = block;
return result;
} else {
block = nextBlock;
while (nextBlock.isValid() && !nextBlock.isVisible()) {
block = nextBlock;
nextBlock = block.next();
}
}
}
}
block = nextBlock;
top = bottom;
bottom = top + blockBoundingRect(block).height();
}
return QTextBlock();
}
void Editor::updateCursorPosition()
{
QTextCursor cursor = textCursor();
QTextBlock block = cursor.block();
if (!block.isVisible()) {
while (!block.isVisible() && block.previous().isValid()) {
block.setVisible(true);
block.setLineCount(qMax(1, block.layout()->lineCount()));
block = block.previous();
}
EditorLayout *layout = static_cast<EditorLayout *>(document()->documentLayout());
layout->requestUpdate();
layout->emitDocumentSizeChanged();
folded = false;
QPlainTextEdit::ensureCursorVisible();
}
}
void Editor::mousePressEvent(QMouseEvent *event)
{
if (folded) {
QTextBlock foldedBlock = foldedBlockAt(event->pos());
if (!foldedBlock.isValid()) {
QPlainTextEdit::mousePressEvent(event);
return;
}
} else {
QPlainTextEdit::mousePressEvent(event);
}
EditorLayout *layout = static_cast<EditorLayout *>(document()->documentLayout());
folded = !folded;
for (int i = 0; i < 3; ++i) {
QTextBlock block = document()->findBlockByNumber(i + 2);
block.setVisible(!folded);
block.setLineCount(folded ? 0 : qMax(1, block.layout()->lineCount()));
}
QTextCursor cursor = textCursor();
if (!cursor.block().isVisible()) {
cursor.setVisualNavigation(true);
cursor.movePosition(QTextCursor::Up);
setTextCursor(cursor);
}
layout->requestUpdate();
layout->emitDocumentSizeChanged();
}
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