96 lines
2.4 KiB
C++
96 lines
2.4 KiB
C++
#include "lineedit-autoresize.hpp"
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LineEditAutoResize::LineEditAutoResize()
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{
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connect(this, SIGNAL(textChanged()), this, SLOT(checkTextLength()));
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connect(document()->documentLayout(),
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SIGNAL(documentSizeChanged(const QSizeF &)), this,
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SLOT(resizeVertically(const QSizeF &)));
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}
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void LineEditAutoResize::checkTextLength()
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{
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QString text = toPlainText();
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if (text.length() > m_maxLength) {
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setPlainText(text.left(m_maxLength));
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QTextCursor cursor = textCursor();
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cursor.setPosition(m_maxLength);
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setTextCursor(cursor);
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}
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}
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int LineEditAutoResize::maxLength()
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{
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return m_maxLength;
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}
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void LineEditAutoResize::setMaxLength(int length)
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{
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m_maxLength = length;
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}
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void LineEditAutoResize::keyPressEvent(QKeyEvent *event)
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{
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/* Always allow events with modifiers, for example to Copy content */
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Qt::KeyboardModifiers modifiers = event->modifiers();
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if (modifiers != Qt::NoModifier && modifiers != Qt::ShiftModifier) {
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QTextEdit::keyPressEvent(event);
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return;
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}
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switch (event->key()) {
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/* Always ignore the return key and send the signal instead */
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case Qt::Key_Return:
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event->ignore();
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emit returnPressed();
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break;
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/* Always allow navigation and deletion */
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case Qt::Key_Left:
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case Qt::Key_Right:
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case Qt::Key_Up:
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case Qt::Key_Down:
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case Qt::Key_PageUp:
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case Qt::Key_PageDown:
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case Qt::Key_Delete:
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case Qt::Key_Backspace:
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QTextEdit::keyPressEvent(event);
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break;
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/* Allow only if the content is not already at max length.
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* Some keys with modifiers should still be allowed though
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* (for example for Copy), and we don't want to make assumptions
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* about which modifiers are okay and which aren't, so let's
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* allow all. Actions that will still exceed the limit (like
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* Paste) can be caught in a later step. */
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default:
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if (toPlainText().length() >= m_maxLength &&
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event->modifiers() == Qt::NoModifier &&
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!textCursor().hasSelection())
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event->ignore();
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else
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QTextEdit::keyPressEvent(event);
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break;
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}
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}
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void LineEditAutoResize::resizeVertically(const QSizeF &newSize)
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{
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QMargins margins = contentsMargins();
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setMaximumHeight(newSize.height() + margins.top() + margins.bottom());
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}
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QString LineEditAutoResize::text()
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{
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return toPlainText();
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}
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void LineEditAutoResize::setText(const QString &text)
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{
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QMetaObject::invokeMethod(this, "SetPlainText", Qt::QueuedConnection,
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Q_ARG(const QString &, text));
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}
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void LineEditAutoResize::SetPlainText(const QString &text)
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{
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setPlainText(text);
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}
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