characterwidget.cpp Example File

widgets/charactermap/characterwidget.cpp
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#include <QtWidgets> #include "characterwidget.h" CharacterWidget::CharacterWidget(QWidget *parent) : QWidget(parent), columns(16), lastKey(-1) { calculateSquareSize(); setMouseTracking(true); } void CharacterWidget::updateFont(const QFont &font) { displayFont.setFamily(font.family()); calculateSquareSize(); adjustSize(); update(); } void CharacterWidget::updateSize(const QString &fontSize) { displayFont.setPointSize(fontSize.toInt()); calculateSquareSize(); adjustSize(); update(); } void CharacterWidget::updateStyle(const QString &fontStyle) { QFontDatabase fontDatabase; const QFont::StyleStrategy oldStrategy = displayFont.styleStrategy(); displayFont = fontDatabase.font(displayFont.family(), fontStyle, displayFont.pointSize()); displayFont.setStyleStrategy(oldStrategy); calculateSquareSize(); adjustSize(); update(); } void CharacterWidget::updateFontMerging(bool enable) { if (enable) displayFont.setStyleStrategy(QFont::PreferDefault); else displayFont.setStyleStrategy(QFont::NoFontMerging); adjustSize(); update(); } void CharacterWidget::calculateSquareSize() { squareSize = qMax(16, 4 + QFontMetrics(displayFont, this).height()); } QSize CharacterWidget::sizeHint() const { return QSize(columns*squareSize, (65536/columns)*squareSize); } void CharacterWidget::mouseMoveEvent(QMouseEvent *event) { QPoint widgetPosition = mapFromGlobal(event->globalPos()); uint key = (widgetPosition.y()/squareSize)*columns + widgetPosition.x()/squareSize; QString text = QString::fromLatin1("<p>Character: <span style=\"font-size: 24pt; font-family: %1\">").arg(displayFont.family()) + QChar(key) + QString::fromLatin1("</span><p>Value: 0x") + QString::number(key, 16); QToolTip::showText(event->globalPos(), text, this); } void CharacterWidget::mousePressEvent(QMouseEvent *event) { if (event->button() == Qt::LeftButton) { lastKey = (event->y()/squareSize)*columns + event->x()/squareSize; if (QChar(lastKey).category() != QChar::Other_NotAssigned) emit characterSelected(QString(QChar(lastKey))); update(); } else QWidget::mousePressEvent(event); } void CharacterWidget::paintEvent(QPaintEvent *event) { QPainter painter(this); painter.fillRect(event->rect(), QBrush(Qt::white)); painter.setFont(displayFont); QRect redrawRect = event->rect(); int beginRow = redrawRect.top()/squareSize; int endRow = redrawRect.bottom()/squareSize; int beginColumn = redrawRect.left()/squareSize; int endColumn = redrawRect.right()/squareSize; painter.setPen(QPen(Qt::gray)); for (int row = beginRow; row <= endRow; ++row) { for (int column = beginColumn; column <= endColumn; ++column) { painter.drawRect(column*squareSize, row*squareSize, squareSize, squareSize); } } QFontMetrics fontMetrics(displayFont); painter.setPen(QPen(Qt::black)); for (int row = beginRow; row <= endRow; ++row) { for (int column = beginColumn; column <= endColumn; ++column) { int key = row*columns + column; painter.setClipRect(column*squareSize, row*squareSize, squareSize, squareSize); if (key == lastKey) painter.fillRect(column*squareSize + 1, row*squareSize + 1, squareSize, squareSize, QBrush(Qt::red)); painter.drawText(column*squareSize + (squareSize / 2) - fontMetrics.width(QChar(key))/2, row*squareSize + 4 + fontMetrics.ascent(), QString(QChar(key))); } } }