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SqlTextEdit: Show line numbers

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Show line numbers in the SqlTextEdit widget. This code is based on the
CodeEditor example from the Qt documentation.
This commit is contained in:
Martin Kleusberg
2013-05-07 20:16:17 +02:00
parent 61ee8b4871
commit 432180ec03
2 changed files with 99 additions and 6 deletions
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83
src/sqltextedit.cpp
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@@ -5,10 +5,11 @@
#include <QAbstractItemView>
#include <QCompleter>
#include <QScrollBar>
//#include <QDebug>
#include <QPainter>
#include <QTextBlock>
SqlTextEdit::SqlTextEdit(QWidget* parent) :
QTextEdit(parent), m_Completer(0), m_defaultCompleterModel(0)
QPlainTextEdit(parent), m_Completer(0), m_defaultCompleterModel(0)
{
// basic auto completer for sqliteedit
m_Completer = new QCompleter(this);
@@ -17,10 +18,16 @@ SqlTextEdit::SqlTextEdit(QWidget* parent) :
m_Completer->setWrapAround(false);
m_Completer->setWidget(this);
// Create line number area
lineNumberArea = new LineNumberArea(this);
connect(this, SIGNAL(blockCountChanged(int)), this, SLOT(updateLineNumberAreaWidth()));
connect(this, SIGNAL(updateRequest(QRect,int)), this, SLOT(updateLineNumberArea(QRect,int)));
connect(m_Completer, SIGNAL(activated(QString)), this, SLOT(insertCompletion(QString)));
connect(this, SIGNAL(cursorPositionChanged()), this, SLOT(highlightCurrentLine()));
highlightCurrentLine();
updateLineNumberAreaWidth();
}
SqlTextEdit::~SqlTextEdit()
@@ -111,6 +118,74 @@ void SqlTextEdit::highlightCurrentLine()
setExtraSelections(extra_selections);
}
int SqlTextEdit::lineNumberAreaWidth()
{
int digits = 1;
int max = qMax(1, blockCount());
while(max >= 10)
{
max /= 10;
++digits;
}
return 3 + fontMetrics().width(QLatin1Char('9')) * digits;
}
void SqlTextEdit::updateLineNumberAreaWidth()
{
setViewportMargins(lineNumberAreaWidth(), 0, 0, 0);
}
void SqlTextEdit::updateLineNumberArea(const QRect& rect, int dy)
{
if(dy)
lineNumberArea->scroll(0, dy);
else
lineNumberArea->update(0, rect.y(), lineNumberArea->width(), rect.height());
if(rect.contains(viewport()->rect()))
updateLineNumberAreaWidth();
}
void SqlTextEdit::resizeEvent(QResizeEvent* e)
{
QPlainTextEdit::resizeEvent(e);
QRect cr = contentsRect();
lineNumberArea->setGeometry(QRect(cr.left(), cr.top(), lineNumberAreaWidth(), cr.height()));
}
void SqlTextEdit::LineNumberArea::paintEvent(QPaintEvent* event)
{
QPainter painter(this);
painter.fillRect(event->rect(), Qt::lightGray);
QTextBlock block = parent->firstVisibleBlock();
int blockNumber = block.blockNumber();
int top = parent->blockBoundingGeometry(block).translated(parent->contentOffset()).top();
int bottom = top + parent->blockBoundingRect(block).height();
while(block.isValid() && top <= event->rect().bottom())
{
if(block.isVisible() && bottom >= event->rect().top())
{
QString number = QString::number(blockNumber + 1);
painter.setPen(Qt::black);
painter.drawText(0, top, width(), fontMetrics().height(), Qt::AlignRight, number);
}
block = block.next();
top = bottom;
bottom = top + parent->blockBoundingRect(block).height();
blockNumber++;
}
}
QSize SqlTextEdit::LineNumberArea::sizeHint() const
{
return QSize(parent->lineNumberAreaWidth(), 0);
}
namespace {
bool isSqliteIdentifierChar(QChar c) {
return c.isLetterOrNumber() || c == '.' || c == '_';
@@ -165,7 +240,7 @@ void SqlTextEdit::focusInEvent(QFocusEvent *e)
{
if (m_Completer)
m_Completer->setWidget(this);
QTextEdit::focusInEvent(e);
QPlainTextEdit::focusInEvent(e);
}
void SqlTextEdit::keyPressEvent(QKeyEvent *e)
@@ -187,7 +262,7 @@ void SqlTextEdit::keyPressEvent(QKeyEvent *e)
bool isShortcut = ((e->modifiers() & Qt::ControlModifier) && e->key() == Qt::Key_Space); // CTRL+SPACE
if (!m_Completer || !isShortcut) // do not process the shortcut when we have a completer
QTextEdit::keyPressEvent(e);
QPlainTextEdit::keyPressEvent(e);
const bool ctrlOrShift = e->modifiers() & (Qt::ControlModifier | Qt::ShiftModifier);
const bool cursorKey = e->key() == Qt::Key_Left ||
e->key() == Qt::Key_Up ||