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#include <QtGui/QPainter>
#include "texteditoroverlay.h"
#include <QDebug>
using namespace TextEditor;
using namespace TextEditor::Internal;
TextEditorOverlay::TextEditorOverlay(BaseTextEditor *editor)
:QObject(editor) {
m_visible = false;
m_borderWidth = 1;
m_editor = editor;
m_viewport = editor->viewport();
}
void TextEditorOverlay::update()
{
if (m_visible)
m_viewport->update();
}
void TextEditorOverlay::setVisible(bool b)
{
if (m_visible == b)
return;
m_visible = b;
update();
}
void TextEditorOverlay::clear()
{
m_selections.clear();
update();
}
void TextEditorOverlay::addOverlaySelection(int begin, int end, const QColor &color, bool lockSize)
return;
QTextDocument *document = m_editor->document();
OverlaySelection selection;
selection.m_color = color;
selection.m_cursor_begin = QTextCursor(document);
selection.m_cursor_begin.setPosition(begin);
selection.m_cursor_end = QTextCursor(document);
selection.m_cursor_end.setPosition(end);
if (lockSize)
selection.m_fixedLength = (end - begin);
m_selections += selection;
update();
}
void TextEditorOverlay::addOverlaySelection(const QTextCursor &cursor, const QColor &color, bool lockSize)
addOverlaySelection(cursor.selectionStart(), cursor.selectionEnd(), color, lockSize);
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}
QRect TextEditorOverlay::rect() const
{
return m_viewport->rect();
}
void TextEditorOverlay::paintSelection(QPainter *painter, const QTextCursor &begin, const QTextCursor &end, const QColor &color)
{
if (begin.isNull() || end.isNull() || begin.position() > end.position())
return;
QPointF offset = m_editor->contentOffset();
QRect viewportRect = rect();
QTextDocument *document = m_editor->document();
if (m_editor->blockBoundingGeometry(begin.block()).translated(offset).top() > viewportRect.bottom() + 10
|| m_editor->blockBoundingGeometry(end.block()).translated(offset).bottom() < viewportRect.top() - 10
)
return; // nothing of the selection is visible
QTextBlock block = begin.block();
bool inSelection = false;
QVector<QRectF> selection;
for (; block.isValid() && block.blockNumber() <= end.blockNumber(); block = block.next()) {
if (! block.isVisible())
continue;
const QRectF blockGeometry = m_editor->blockBoundingGeometry(block);
QTextLayout *blockLayout = block.layout();
QTextLine line = blockLayout->lineAt(0);
int beginChar = 0;
if (!inSelection) {
beginChar = begin.position() - begin.block().position();
line = blockLayout->lineForTextPosition(beginChar);
inSelection = true;
} else {
while (beginChar < block.length() && document->characterAt(block.position() + beginChar).isSpace())
++beginChar;
if (beginChar == block.length())
beginChar = 0;
}
int lastLine = blockLayout->lineCount()-1;
int endChar = -1;
if (block == end.block()) {
endChar = end.position() - end.block().position();
lastLine = blockLayout->lineForTextPosition(endChar).lineNumber();
inSelection = false;
} else {
endChar = block.length();
while (endChar > beginChar && document->characterAt(block.position() + endChar - 1).isSpace())
--endChar;
}
QRectF lineRect = line.naturalTextRect();
if (beginChar < endChar) {
lineRect.setLeft(line.cursorToX(beginChar));
if (line.lineNumber() == lastLine)
lineRect.setRight(line.cursorToX(endChar));
selection += lineRect.translated(blockGeometry.topLeft());
for (int lineIndex = line.lineNumber()+1; lineIndex <= lastLine; ++lineIndex) {
line = blockLayout->lineAt(lineIndex);
lineRect = line.naturalTextRect();
if (lineIndex == lastLine)
lineRect.setRight(line.cursorToX(endChar));
selection += lineRect.translated(blockGeometry.topLeft());
}
} else { // empty lines
if (!selection.isEmpty())
lineRect.setLeft(selection.last().left());
lineRect.setRight(lineRect.left() + 16);
selection += lineRect.translated(blockGeometry.topLeft());
}
if (!inSelection)
break;
if (blockGeometry.translated(offset).y() > 2*viewportRect.height())
break;
}
if (selection.isEmpty())
return;
QVector<QPointF> points;
const int margin = m_borderWidth/2;
points += (selection.at(0).topLeft() + selection.at(0).topRight()) / 2 + QPointF(0, -margin);
points += selection.at(0).topRight() + QPointF(margin+1, -margin);
points += selection.at(0).bottomRight() + QPointF(margin+1, 0);
for(int i = 1; i < selection.count()-1; ++i) {
#define MAX3(a,b,c) qMax(a, qMax(b,c))
qreal x = MAX3(selection.at(i-1).right(),
selection.at(i).right(),
selection.at(i+1).right()) + margin;
points += QPointF(x+1, selection.at(i).top());
points += QPointF(x+1, selection.at(i).bottom()+1);
}
points += selection.at(selection.count()-1).topRight() + QPointF(margin+1, 0);
points += selection.at(selection.count()-1).bottomRight() + QPointF(margin+1, margin+1);
points += selection.at(selection.count()-1).bottomLeft() + QPointF(-margin, margin+1);
points += selection.at(selection.count()-1).topLeft() + QPointF(-margin, 0);
for(int i = selection.count()-2; i > 0; --i) {
#define MIN3(a,b,c) qMin(a, qMin(b,c))
qreal x = MIN3(selection.at(i-1).left(),
selection.at(i).left(),
selection.at(i+1).left()) - margin;
points += QPointF(x, selection.at(i).bottom()+1);
points += QPointF(x, selection.at(i).top());
}
points += selection.at(0).bottomLeft() + QPointF(-margin, 1);
points += selection.at(0).topLeft() + QPointF(-margin, -margin);
QPainterPath path;
const int corner = 4;
path.moveTo(points.at(0));
points += points.at(0);
QPointF previous = points.at(0);
for (int i = 1; i < points.size(); ++i) {
QPointF point = points.at(i);
if (point.y() == previous.y() && qAbs(point.x() - previous.x()) > 2*corner) {
QPointF tmp = QPointF(previous.x() + corner * ((point.x() > previous.x())?1:-1), previous.y());
path.quadTo(previous, tmp);
previous = tmp;
i--;
continue;
} else if (point.x() == previous.x() && qAbs(point.y() - previous.y()) > 2*corner) {
QPointF tmp = QPointF(previous.x(), previous.y() + corner * ((point.y() > previous.y())?1:-1));
path.quadTo(previous, tmp);
previous = tmp;
i--;
continue;
}
QPointF target = (previous + point) / 2;
path.quadTo(previous, target);
previous = points.at(i);
}
path.closeSubpath();
painter->save();
QPen pen(color, m_borderWidth);
painter->translate(-.5, -.5);
QColor brush = color;
brush.setAlpha(30);
painter->setRenderHint(QPainter::Antialiasing);
pen.setJoinStyle(Qt::RoundJoin);
painter->setPen(pen);
painter->setBrush(brush);
path.translate(offset);
painter->drawPath(path);
painter->restore();
}
void TextEditorOverlay::paint(QPainter *painter, const QRect &clip)
{
Q_UNUSED(clip);
for (int i = 0; i < m_selections.size(); ++i) {
const OverlaySelection &selection = m_selections.at(i);
if (selection.m_fixedLength >= 0
&& selection.m_cursor_end.position() - selection.m_cursor_begin.position()
!= selection.m_fixedLength)
continue;