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textedit.cpp
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textedit.cpp
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// Copyright 2010 Anders Bakken
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <QScrollArea>
#include <QScrollBar>
#include <QDesktopWidget>
#include "textedit.h"
#include "textedit_p.h"
#include "textcursor_p.h"
#include "textdocument_p.h"
#ifndef QT_NO_DEBUG
bool doLog = true;
QString logFileName;
#endif
/*!
Constructs an empty TextEdit with parent \a parent.
*/
TextEdit::TextEdit(QWidget *parent)
: QAbstractScrollArea(parent), d(new TextEditPrivate(this))
{
viewport()->setCursor(Qt::IBeamCursor);
#ifndef QT_NO_DEBUG
if (logFileName.isEmpty())
logFileName = QDateTime::currentDateTime().toString("yyyyMMdd_hhmmsszzz.log");
#endif
connect(verticalScrollBar(), SIGNAL(valueChanged(int)), d, SLOT(onScrollBarValueChanged(int)));
connect(verticalScrollBar(), SIGNAL(actionTriggered(int)), d, SLOT(onScrollBarActionTriggered(int)));
connect(verticalScrollBar(), SIGNAL(sliderReleased()), d, SLOT(updateScrollBar()));
setDocument(new TextDocument(this));
setViewportMargins(0, 0, 0, 0);
struct {
QString text;
const char *member;
QKeySequence::StandardKey key;
} shortcuts[] = {
{ tr("Copy"), SLOT(copy()), QKeySequence::Copy },
{ tr("Paste"), SLOT(paste()), QKeySequence::Paste },
{ tr("Cut"), SLOT(cut()), QKeySequence::Cut },
{ tr("Undo"), SLOT(undo()), QKeySequence::Undo },
{ tr("Redo"), SLOT(redo()), QKeySequence::Redo },
{ tr("Select All"), SLOT(selectAll()), QKeySequence::SelectAll },
{ QString(), 0, QKeySequence::UnknownKey } };
for (int i=0; shortcuts[i].member; ++i) {
d->actions[i] = new QAction(shortcuts[i].text, this);
d->actions[i]->setShortcutContext(Qt::WidgetShortcut);
d->actions[i]->setShortcut(QKeySequence(shortcuts[i].key));
d->actions[i]->setShortcutContext(Qt::WidgetShortcut);
connect(d->actions[i], SIGNAL(triggered(bool)), this, shortcuts[i].member);
addAction(d->actions[i]);
}
connect(this, SIGNAL(undoAvailableChanged(bool)), d->actions[UndoAction], SLOT(setEnabled(bool)));
connect(this, SIGNAL(redoAvailableChanged(bool)), d->actions[RedoAction], SLOT(setEnabled(bool)));
d->actions[UndoAction]->setEnabled(false);
d->actions[RedoAction]->setEnabled(false);
setContextMenuPolicy(Qt::ActionsContextMenu);
setCursorVisible(true); // starts blinking
connect(this, SIGNAL(selectionChanged()), d, SLOT(onSelectionChanged()));
}
/*!
returns the current cursor position
*/
int TextEdit::cursorPosition() const
{
return d->textCursor.position();
}
/*!
ensures that \a cursor is visible with \a linesMargin lines of
margin on each side (if possible)
*/
void TextEdit::ensureCursorVisible(const TextCursor &cursor, int linesMargin)
{
linesMargin = qMin(d->visibleLines, linesMargin); // ### could this be a problem down at the bottom of the document?
Q_ASSERT(cursor.document() == document());
TextCursor above = cursor;
for (int i=0; i<linesMargin; ++i) {
if (!above.movePosition(TextCursor::Up))
break;
}
if (above.position() < d->viewportPosition) {
d->updateViewportPosition(above.position(), TextLayout::Backward);
return;
}
TextCursor below = cursor;
for (int i=0; i<linesMargin; ++i) {
if (!below.movePosition(TextCursor::Down))
break;
}
if (below.position() > d->lastVisibleCharacter) {
for (int i=0; i<d->visibleLines; ++i) {
below.movePosition(TextCursor::Up);
d->updateViewportPosition(below.position(), TextLayout::Forward);
}
}
}
/*!
returns the QAction * for \a type.
*/
QAction *TextEdit::action(ActionType type) const
{
return d->actions[type];
}
/*!
Called when the textEdit is deleted
*/
TextEdit::~TextEdit()
{
if (d->document) {
foreach(SyntaxHighlighter *syntaxHighlighter, d->syntaxHighlighters) {
if (syntaxHighlighter->parent() == this)
disconnect(syntaxHighlighter, 0, d, 0);
syntaxHighlighter->d->textEdit = 0;
syntaxHighlighter->d->textLayout = 0;
}
disconnect(d->document, 0, this, 0);
disconnect(d->document, 0, d, 0);
disconnect(d->document->d, 0, this, 0);
disconnect(d->document->d, 0, d, 0);
if (d->document->parent() == this) {
delete d->document;
d->document = 0;
} else {
d->document->d->textEditDestroyed(this);
}
// to make sure we don't do anything drastic on shutdown
}
delete d;
}
/*!
returns the text edit's document. document() always returns a
valid TextDocument *
\sa setDocument
*/
TextDocument *TextEdit::document() const
{
return d->document;
}
/*!
sets the text edit's document to \a doc. The previous document
will be deleted if it's parented to the text edit.
If \a doc is 0 a default TextDocument will be set.
\sa document
*/
void TextEdit::setDocument(TextDocument *doc)
{
if (doc == d->document)
return;
if (d->document) {
disconnect(d->document, 0, this, 0);
disconnect(d->document, 0, d, 0);
disconnect(d->document->d, 0, this, 0);
disconnect(d->document->d, 0, d, 0);
if (d->document->parent() == this)
delete d->document;
}
if (!doc)
doc = new TextDocument(this);
d->sections.clear();
d->buffer.clear();
d->sectionsDirty = true;
d->document = doc;
d->sectionPressed = 0;
d->layoutDirty = true;
qDeleteAll(d->unusedTextLayouts);
d->unusedTextLayouts.clear();
qDeleteAll(d->textLayouts);
d->textLayouts.clear();
viewport()->setCursor(Qt::IBeamCursor);
viewport()->setMouseTracking(true);
d->sectionCount = 0;
d->textCursor = TextCursor(doc);
d->textCursor.textEdit = this;
connect(d->document->d, SIGNAL(undoRedoCommandInserted(DocumentCommand *)),
d, SLOT(onDocumentCommandInserted(DocumentCommand *)));
connect(d->document, SIGNAL(sectionAdded(TextSection *)),
d, SLOT(onTextSectionAdded(TextSection *)));
connect(d->document, SIGNAL(sectionRemoved(TextSection *)),
d, SLOT(onTextSectionRemoved(TextSection *)));
connect(d->document->d, SIGNAL(undoRedoCommandRemoved(DocumentCommand *)),
d, SLOT(onDocumentCommandRemoved(DocumentCommand *)));
connect(d->document->d, SIGNAL(undoRedoCommandTriggered(DocumentCommand *, bool)),
d, SLOT(onDocumentCommandTriggered(DocumentCommand *, bool)));
connect(d->document, SIGNAL(charactersAdded(int, int)),
d, SLOT(onCharactersAddedOrRemoved(int, int)));
connect(d->document, SIGNAL(charactersRemoved(int, int)),
d, SLOT(onCharactersAddedOrRemoved(int, int)));
connect(d->document, SIGNAL(textChanged()), this, SIGNAL(textChanged()));
connect(d->document, SIGNAL(undoAvailableChanged(bool)),
this, SIGNAL(undoAvailableChanged(bool)));
connect(d->document, SIGNAL(redoAvailableChanged(bool)),
this, SIGNAL(redoAvailableChanged(bool)));
connect(d->document, SIGNAL(documentSizeChanged(int)), d, SLOT(onDocumentSizeChanged(int)));
connect(d->document, SIGNAL(destroyed(QObject*)), d, SLOT(onDocumentDestroyed()));
connect(d->document->d, SIGNAL(sectionFormatChanged(TextSection *)),
d, SLOT(onTextSectionFormatChanged(TextSection *)));
connect(d->document->d, SIGNAL(sectionCursorChanged(TextSection *)),
d, SLOT(onTextSectionCursorChanged(TextSection *)));
d->onDocumentSizeChanged(d->document->documentSize());
viewport()->update();
}
/*!
returns the textCursor's width (in pixels)
\sa setCursorWidth
*/
int TextEdit::cursorWidth() const
{
return d->cursorWidth;
}
/*!
sets the cursorWidth of the text edit to \a cw pixels.
\a cw must be a valid integer larger than 0.
\sa setCursorVisible
*/
void TextEdit::setCursorWidth(int cw)
{
Q_ASSERT(d->cursorWidth > 0);
d->cursorWidth = cw;
viewport()->update();
}
/*!
Loads the contenst of \a dev into the text edit's document.
Equivalent to calling document()->load(\a dev, \a mode);
\sa setCursorVisible
*/
bool TextEdit::load(QIODevice *dev, TextDocument::DeviceMode mode, QTextCodec *codec)
{
#ifndef QT_NO_DEBUG
if (doLog) {
QFile f(logFileName);
f.open(QIODevice::WriteOnly);
QDataStream ds(&f);
if (QFile *ff = qobject_cast<QFile*>(dev)) {
ds << ff->fileName();
} else {
ds << QString::fromLatin1(dev->metaObject()->className());
}
}
#endif
return d->document->load(dev, mode, codec);
}
bool TextEdit::load(const QString &file, TextDocument::DeviceMode mode, QTextCodec *codec)
{
#ifndef QT_NO_DEBUG
if (doLog) {
QFile f(logFileName);
f.open(QIODevice::WriteOnly);
QDataStream ds(&f);
ds << file;
}
#endif
return d->document->load(file, mode, codec);
}
enum SelectionAddStatus {
Invalid,
Before,
After,
Success
};
static inline SelectionAddStatus addSelection(int layoutStart, int layoutLength,
const TextCursor &cursor, QTextLayout::FormatRange *format)
{
Q_ASSERT(format);
if (!cursor.hasSelection())
return Invalid;
if (cursor.selectionEnd() < layoutStart)
return Before;
if (cursor.selectionStart() > layoutStart + layoutLength)
return After;
format->start = qMax(0, cursor.selectionStart() - layoutStart);
format->length = qMin(layoutLength - format->start,
cursor.selectionEnd() - layoutStart - format->start);
return Success;
}
void TextEdit::paintEvent(QPaintEvent *e)
{
d->updateScrollBarPosition();
d->relayout();
if (d->updateScrollBarPageStepPending) {
d->updateScrollBarPageStepPending = false;
d->updateScrollBarPageStep();
}
QPainter p(viewport());
const QRect er = e->rect();
p.translate(-horizontalScrollBar()->value(), 0);
p.setFont(font());
QVector<QTextLayout::FormatRange> selections;
selections.reserve(d->extraSelections.size() + 1);
int textLayoutOffset = d->viewportPosition;
const QTextLayout *cursorLayout = d->cursorVisible ? d->layoutForPosition(d->textCursor.position()) : 0;
int extraSelectionIndex = 0;
QTextLayout::FormatRange selectionRange;
selectionRange.start = -1;
foreach(QTextLayout *l, d->textLayouts) {
const int textSize = l->text().size();
const QRect r = l->boundingRect().toRect();
if (r.intersects(er)) {
const QBrush background = d->blockFormats.value(l).background();
if (background.style() != Qt::NoBrush) {
p.fillRect(r, background);
}
if (::addSelection(textLayoutOffset, textSize, d->textCursor, &selectionRange) == Success) {
selectionRange.format.setBackground(palette().highlight());
selectionRange.format.setForeground(palette().highlightedText());
}
int lowestIncompleteSelection = -1;
while (extraSelectionIndex < d->extraSelections.size()) {
QTextLayout::FormatRange range;
const SelectionAddStatus s = ::addSelection(textLayoutOffset, textSize,
d->extraSelections.at(extraSelectionIndex).
cursor, &range);
if (s == Success) {
range.format = d->extraSelections.at(extraSelectionIndex).format;
selections.append(range);
const TextCursor &cursor = d->extraSelections.at(extraSelectionIndex).cursor;
int lastPos = cursor.position() + cursor.selectionSize();
if (lastPos > textLayoutOffset+textSize && lowestIncompleteSelection < 0) {
lowestIncompleteSelection = extraSelectionIndex;
}
} else if (s == After) {
break;
}
++extraSelectionIndex;
}
if (lowestIncompleteSelection > -1) {
extraSelectionIndex = lowestIncompleteSelection;
}
if (selectionRange.start != -1) {
// The last range in the vector has priority, that
// should probably be the real selection
selections.append(selectionRange);
selectionRange.start = -1;
}
l->draw(&p, QPoint(0, 0), selections);
if (!selections.isEmpty())
selections.clear();
if (cursorLayout == l) {
cursorLayout->drawCursor(&p, QPoint(0, 0), d->textCursor.position() - textLayoutOffset,
d->cursorWidth);
}
} else if (r.top() > er.bottom()) {
break;
}
textLayoutOffset += l->text().size() + 1;
}
#if 0
QRect r = cursorRect(d->textCursor);
QTextLine line = d->lineForPosition(cursorPosition());
p.drawRect(line.rect().adjusted(0, 0, -1, -1));
p.fillRect(r.adjusted(0, 0, 20, 0), QColor(0, 255, 0, 120));
#endif
}
void TextEdit::scrollContentsBy(int dx, int dy)
{
Q_UNUSED(dx);
Q_UNUSED(dy);
// viewport()->update();
viewport()->scroll(dx, dy); // seems to jitter more
}
int TextEdit::viewportPosition() const
{
return d->viewportPosition;
}
bool TextEdit::isUndoAvailable() const
{
return d->document->isUndoAvailable();
}
bool TextEdit::isRedoAvailable() const
{
return d->document->isRedoAvailable();
}
void TextEdit::mousePressEvent(QMouseEvent *e)
{
d->inMouseEvent = true;
if (e->button() == Qt::LeftButton) {
#ifndef QT_NO_DEBUG
if (doLog) {
QFile file(logFileName);
file.open(QIODevice::Append);
QDataStream ds(&file);
ds << int(e->type()) << e->pos() << e->button() << e->buttons() << e->modifiers();
}
#endif
if (d->tripleClickTimer.isActive()) {
d->tripleClickTimer.stop();
d->textCursor.movePosition(TextCursor::StartOfBlock);
d->textCursor.movePosition(TextCursor::EndOfBlock, TextCursor::KeepAnchor);
} else {
const bool shift = e->modifiers() & Qt::ShiftModifier;
if (!shift) {
clearSelection();
}
int pos = textPositionAt(e->pos());
if (pos == -1)
pos = d->document->documentSize() - 1;
d->sectionPressed = d->document->d->sectionAt(pos, this);
setCursorPosition(pos, shift ? TextCursor::KeepAnchor : TextCursor::MoveAnchor);
}
e->accept();
} else if (e->button() == Qt::MidButton && qApp->clipboard()->supportsSelection()) {
int pos = textPositionAt(e->pos());
if (pos == -1)
pos = d->document->documentSize() - 1;
paste(pos, QClipboard::Selection);
e->accept();
} else {
QAbstractScrollArea::mousePressEvent(e);
}
}
void TextEdit::mouseDoubleClickEvent(QMouseEvent *e)
{
if (e->button() == Qt::LeftButton) {
#ifndef QT_NO_DEBUG
if (doLog) {
QFile file(logFileName);
file.open(QIODevice::Append);
QDataStream ds(&file);
ds << int(e->type()) << e->pos() << e->button() << e->buttons() << e->modifiers();
}
#endif
const int pos = textPositionAt(e->pos());
if (pos == d->textCursor.position()) {
d->tripleClickTimer.start(qApp->doubleClickInterval(), d);
if (d->document->isWordCharacter(d->textCursor.cursorCharacter(),
d->textCursor.position())) {
// ### this is not quite right
d->textCursor.movePosition(TextCursor::StartOfWord);
d->textCursor.movePosition(TextCursor::EndOfWord, TextCursor::KeepAnchor);
return;
}
}
mousePressEvent(e);
}
}
void TextEdit::mouseMoveEvent(QMouseEvent *e)
{
if (e->buttons() == Qt::NoButton) {
d->updateCursorPosition(e->pos());
} else if (e->buttons() == Qt::LeftButton && d->document->documentSize()) {
#ifndef QT_NO_DEBUG
if (doLog) {
QFile file(logFileName);
file.open(QIODevice::Append);
QDataStream ds(&file);
ds << int(e->type()) << e->pos() << e->button() << e->buttons() << e->modifiers();
}
#endif
const QRect r = viewport()->rect();
d->lastMouseMove = e->pos();
e->accept();
if (e->y() < r.top()) {
if (d->atBeginning()) {
d->updateHorizontalPosition();
d->autoScrollTimer.stop();
return;
}
} else if (e->y() > r.bottom()) {
if (d->atEnd()) {
d->updateHorizontalPosition();
d->autoScrollTimer.stop();
return;
}
} else {
int pos = textPositionAt(QPoint(qBound(0, d->lastMouseMove.x(), r.right()), d->lastMouseMove.y()));
if (pos == -1)
pos = d->document->documentSize();
d->autoScrollTimer.stop();
setCursorPosition(pos, TextCursor::KeepAnchor);
return;
}
const int distance = qMax(r.top() - d->lastMouseMove.y(), d->lastMouseMove.y() - r.bottom());
Q_ASSERT(distance != 0);
enum { MinimumTimeOut = 3 };
int timeout = qMax<int>(MinimumTimeOut, 100 - distance);
enum { Margin = 3 };
if (qApp->desktop()->screenGeometry(this).bottom() - mapToGlobal(d->lastMouseMove).y() <= Margin) {
timeout = MinimumTimeOut;
}
d->autoScrollLines = 1 + ((100 - timeout) / 30);
if (d->autoScrollTimer.isActive()) {
d->pendingTimeOut = timeout;
} else {
d->pendingTimeOut = -1;
d->autoScrollTimer.start(timeout, d);
}
} else {
QAbstractScrollArea::mouseMoveEvent(e);
}
}
void TextEdit::mouseReleaseEvent(QMouseEvent *e)
{
d->inMouseEvent = false;
if (e->button() == Qt::LeftButton) {
#ifndef QT_NO_DEBUG
if (doLog) {
QFile file(logFileName);
file.open(QIODevice::Append);
QDataStream ds(&file);
ds << int(e->type()) << e->pos() << e->button() << e->buttons() << e->modifiers();
}
#endif
d->autoScrollTimer.stop();
d->pendingTimeOut = -1;
e->accept();
if (d->sectionPressed && sectionAt(e->pos()) == d->sectionPressed) {
emit sectionClicked(d->sectionPressed, e->pos());
}
d->sectionPressed = 0;
} else {
QAbstractScrollArea::mouseReleaseEvent(e);
}
}
void TextEdit::resizeEvent(QResizeEvent *e)
{
#ifndef QT_NO_DEBUG
if (doLog) {
QFile file(logFileName);
file.open(QIODevice::Append);
QDataStream ds(&file);
ds << int(e->type()) << e->size();
}
#endif
QAbstractScrollArea::resizeEvent(e);
d->updateScrollBarPageStepPending = true;
d->layoutDirty = true;
}
#if 0
void TextEdit::dragEnterEvent(QDragEnterEvent *e)
{
if (!d->readOnly && d->canInsertFromMimeData(e->mimeData())) {
e->acceptProposedAction();
} else {
e->ignore();
}
}
void TextEdit::dragMoveEvent(QDragMoveEvent *e)
{
if (d->dragOverrideCursor.isValid()) {
const QRect r = cursorRect(d->dragOverrideCursor);
if (!r.isNull())
viewport()->update(r);
d->dragOverrideCursor = TextCursor();
}
if (!d->readOnly && d->canInsertFromMimeData(e->mimeData())) {
int pos;
if (e->pos().y() > viewport()->rect().bottom()) {
pos = d->document->documentSize();
} else {
pos = textPositionAt(e->pos());
}
if (pos != -1) {
e->acceptProposedAction();
d->dragOverrideCursor = TextCursor(this);
d->dragOverrideCursor.setPosition(pos);
const QRect r = cursorRect(d->dragOverrideCursor);
if (!r.isNull())
viewport()->update(r);
return;
}
}
e->ignore();
}
void TextEdit::dropEvent(QDropEvent *e)
{
if (!d->readOnly && d->canInsertFromMimeData(e->mimeData())) {
int pos;
if (e->pos().y() > viewport()->rect().bottom()) {
pos = d->document->documentSize();
} else {
pos = textPositionAt(e->pos());
}
if (pos != -1) {
e->acceptProposedAction();
d->dragOverrideCursor = TextCursor(this);
d->dragOverrideCursor.setPosition(pos);
const QRect r = cursorRect(d->dragOverrideCursor);
if (!r.isNull())
viewport()->update(r);
return;
}
}
e->ignore();
}
#endif
int TextEdit::textPositionAt(const QPoint &pos) const
{
if (!viewport()->rect().contains(pos))
return -1;
return d->textPositionAt(pos);
}
bool TextEdit::readOnly() const
{
return d->readOnly;
}
void TextEdit::setReadOnly(bool rr)
{
d->readOnly = rr;
setCursorVisible(!rr);
d->actions[PasteAction]->setEnabled(!rr);
d->actions[CutAction]->setEnabled(!rr);
const bool redoWasAvailable = isRedoAvailable();
const bool undoWasAvailable = isUndoAvailable();
d->actions[UndoAction]->setEnabled(!rr);
d->actions[RedoAction]->setEnabled(!rr);
if (undoWasAvailable != isUndoAvailable())
emit undoAvailableChanged(!undoWasAvailable);
if (redoWasAvailable != isRedoAvailable())
emit redoAvailableChanged(!redoWasAvailable);
}
bool TextEdit::lineBreaking() const
{
return d->lineBreaking;
}
void TextEdit::setLineBreaking(bool lineBreaking)
{
if (d->lineBreaking != lineBreaking) {
d->lineBreaking = lineBreaking;
d->layoutDirty = true;
viewport()->update();
}
}
int TextEdit::maximumSizeCopy() const
{
return d->maximumSizeCopy;
}
void TextEdit::setMaximumSizeCopy(int max)
{
d->maximumSizeCopy = qMax(0, max);
d->updateCopyAndCutEnabled();
}
QRect TextEdit::cursorBlockRect(const TextCursor &textCursor) const
{
if (const QTextLayout *l = d->layoutForPosition(textCursor.position())) {
return l->boundingRect().toRect();
}
return QRect();
}
QRect TextEdit::cursorRect(const TextCursor &textCursor) const
{
int offset = -1;
if (d->layoutForPosition(textCursor.position(), &offset)) {
ASSUME(offset != -1);
QTextLine line = d->lineForPosition(textCursor.position());
qreal x = line.cursorToX(offset);
return QRect(x, line.y(), d->cursorWidth, line.height());
}
return QRect();
}
int TextEdit::lineNumber(int position) const
{
return d->document->lineNumber(position);
}
int TextEdit::columnNumber(int position) const
{
TextCursor cursor(this, position);
return cursor.isNull() ? -1 : cursor.columnNumber();
}
int TextEdit::lineNumber(const TextCursor &cursor) const
{
return cursor.document() == d->document
? d->document->lineNumber(cursor.position()) : -1;
}
int TextEdit::columnNumber(const TextCursor &cursor) const
{
return cursor.document() == d->document
? cursor.columnNumber() : -1;
}
void TextEdit::wheelEvent(QWheelEvent *e)
{
if (e->orientation() == Qt::Vertical) {
d->scrollLines(3 * (e->delta() > 0 ? -1 : 1));
} else {
QAbstractScrollArea::wheelEvent(e);
}
}
void TextEdit::changeEvent(QEvent *e)
{
if (e->type() == QEvent::FontChange) {
d->font = font();
foreach(QTextLayout *l, d->textLayouts) {
l->setFont(d->font);
}
foreach(QTextLayout *l, d->unusedTextLayouts) {
l->setFont(d->font);
}
d->layoutDirty = true;
viewport()->update();
}
}
void TextEdit::keyPressEvent(QKeyEvent *e)
{
#ifndef QT_NO_DEBUG
if (doLog) {
QFile file(logFileName);
file.open(QIODevice::Append);
QDataStream ds(&file);
ds << int(e->type()) << e->key() << int(e->modifiers()) << e->text() << e->isAutoRepeat() << e->count();
}
#endif
Q_ASSERT(d->textCursor.textEdit == this);
if (d->readOnly) {
d->cursorMoveKeyEventReadOnly(e);
return;
}
ensureCursorVisible();
if (d->textCursor.cursorMoveKeyEvent(e)) {
e->accept();
return;
}
TextCursor::MoveOperation operation = TextCursor::NoMove;
bool restoreCursorPosition = false;
if (e->key() == Qt::Key_Backspace && !(e->modifiers() & ~Qt::ShiftModifier)) {
operation = TextCursor::Left;
} else {
enum { Count = 4 };
struct {
QKeySequence::StandardKey standardKey;
TextCursor::MoveOperation operation;
bool restoreCursorPosition;
} commands[Count] = {
{ QKeySequence::Delete, TextCursor::Right, true },
{ QKeySequence::DeleteStartOfWord, TextCursor::StartOfWord, false },
{ QKeySequence::DeleteEndOfWord, TextCursor::EndOfWord, true },
{ QKeySequence::DeleteEndOfLine, TextCursor::EndOfLine, true },
};
for (int i=0; i<Count; ++i) {
if (e->matches(commands[i].standardKey)) {
operation = commands[i].operation;
restoreCursorPosition = commands[i].restoreCursorPosition;
break;
}
}
}
if (operation != TextCursor::NoMove) {
if (hasSelection()) {
const int old = qMin(d->textCursor.anchor(), d->textCursor.position());
removeSelectedText();
setCursorPosition(old, TextCursor::MoveAnchor);
} else {
const int old = d->textCursor.position();
if (moveCursorPosition(operation, TextCursor::KeepAnchor)) {
removeSelectedText();
if (restoreCursorPosition) {
setCursorPosition(old, TextCursor::MoveAnchor);
}
}
}
} else if (e->key() == Qt::Key_Enter || e->key() == Qt::Key_Return) {
d->textCursor.insertText(QLatin1String("\n"));
} else if (!e->text().isEmpty() && !(e->modifiers() & ~Qt::ShiftModifier)) {
d->textCursor.insertText(e->text());
} else {
e->ignore();
// QAbstractScrollArea::keyPressEvent(e); // this causes some
// weird unrecognized key to go through to the scrollBar and raise hell
return;
}
}
void TextEdit::keyReleaseEvent(QKeyEvent *e)
{
#ifndef QT_NO_DEBUG
if (doLog) { // ### does it make any sense to replay these? Probably not
QFile file(logFileName);
file.open(QIODevice::Append);
QDataStream ds(&file);
ds << int(e->type()) << e->key() << int(e->modifiers()) << e->text() << e->isAutoRepeat() << e->count();
}
#endif
QAbstractScrollArea::keyReleaseEvent(e);
}
void TextEdit::setCursorPosition(int pos, TextCursor::MoveMode mode)
{
d->textCursor.setPosition(pos, mode);
}
bool TextEdit::moveCursorPosition(TextCursor::MoveOperation op, TextCursor::MoveMode mode, int n)
{
return d->textCursor.movePosition(op, mode, n);
}
void TextEdit::copy(QClipboard::Mode mode)
{
if (d->textCursor.selectionSize() <= d->maximumSizeCopy) {
QApplication::clipboard()->setText(selectedText(), mode);
}
}
void TextEdit::paste(QClipboard::Mode mode)
{
paste(cursorPosition(), mode);
}
void TextEdit::paste(int pos, QClipboard::Mode mode)
{
if (d->readOnly)
return;
textCursor().setPosition(pos);
textCursor().insertText(qApp->clipboard()->text(mode));
}
bool TextEdit::cursorVisible() const
{
return d->cursorBlinkTimer.isActive();
}
void TextEdit::setCursorVisible(bool cc)
{
if (cc == d->cursorBlinkTimer.isActive())
return;
d->cursorVisible = cc;
if (cc) {
d->cursorBlinkTimer.start(QApplication::cursorFlashTime(), d);
} else {
d->cursorBlinkTimer.stop();
}
const QRect r = cursorRect(d->textCursor) & viewport()->rect();
if (!r.isNull()) {
viewport()->update(r);
}
}
void TextEdit::clearSelection()
{
if (!d->textCursor.hasSelection())
return;
d->textCursor.clearSelection();
}
QString TextEdit::selectedText() const
{
return d->textCursor.selectedText();
}
bool TextEdit::hasSelection() const
{
return d->textCursor.hasSelection();
}
void TextEdit::insert(int pos, const QString &text)
{
Q_ASSERT(d->document);
d->document->insert(pos, text);
}
void TextEdit::remove(int from, int size)
{
if (d->readOnly)
return;
Q_ASSERT(d->document);
d->document->remove(from, size);
}
void TextEdit::append(const QString &text)
{
Q_ASSERT(d->document);
enum { Margin = 1 };
const int diff = verticalScrollBar()->maximum() - verticalScrollBar()->value();
d->document->append(text);
if (diff <= Margin)
verticalScrollBar()->setValue(verticalScrollBar()->maximum() - diff);
}
void TextEdit::removeSelectedText()
{
if (d->readOnly)
return;
d->textCursor.removeSelectedText();
}
void TextEdit::cut()
{
if (d->readOnly || !hasSelection())
return;
copy(QClipboard::Clipboard);
removeSelectedText();
}
void TextEdit::undo()
{
if (!d->readOnly)
d->document->undo();
}
void TextEdit::redo()
{
if (!d->readOnly)
d->document->redo();
}
void TextEdit::selectAll()
{
TextCursor cursor(d->document);
Q_ASSERT(cursor.position() == 0);
cursor.movePosition(TextCursor::End, TextCursor::KeepAnchor);
setTextCursor(cursor);
emit selectionChanged();
}
bool TextEdit::save(QIODevice *device)
{
return d->document->save(device);
}
bool TextEdit::save(const QString &file)
{
return d->document->save(file);
}
bool TextEdit::save()
{