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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "characterwidget.h"
#include <QFontDatabase>
#include <QMouseEvent>
#include <QPainter>
#include <QToolTip>
//! [0]
CharacterWidget::CharacterWidget(QWidget *parent)
: QWidget(parent)
{
calculateSquareSize();
setMouseTracking(true);
}
//! [0]
//! [1]
void CharacterWidget::updateFont(const QFont &font)
{
displayFont.setFamily(font.family());
calculateSquareSize();
adjustSize();
update();
}
//! [1]
//! [2]
void CharacterWidget::updateSize(const QString &fontSize)
{
displayFont.setPointSize(fontSize.toInt());
calculateSquareSize();
adjustSize();
update();
}
//! [2]
void CharacterWidget::updateStyle(const QString &fontStyle)
{
const QFont::StyleStrategy oldStrategy = displayFont.styleStrategy();
displayFont = QFontDatabase::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());
}
//! [3]
QSize CharacterWidget::sizeHint() const
{
return QSize(columns*squareSize, (65536 / columns) * squareSize);
}
//! [3]
//! [4]
void CharacterWidget::mouseMoveEvent(QMouseEvent *event)
{
QPoint widgetPosition = mapFromGlobal(event->globalPosition().toPoint());
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->globalPosition().toPoint(), text, this);
}
//! [4]
//! [5]
void CharacterWidget::mousePressEvent(QMouseEvent *event)
{
if (event->button() == Qt::LeftButton) {
lastKey = (event->position().toPoint().y() / squareSize) * columns + event->position().toPoint().x() / squareSize;
if (QChar(lastKey).category() != QChar::Other_NotAssigned)
emit characterSelected(QString(QChar(lastKey)));
update();
}
else
QWidget::mousePressEvent(event);
}
//! [5]
//! [6]
void CharacterWidget::paintEvent(QPaintEvent *event)
{
QPainter painter(this);
painter.fillRect(event->rect(), QBrush(Qt::white));
painter.setFont(displayFont);
//! [6]
//! [7]
QRect redrawRect = event->rect();
int beginRow = redrawRect.top() / squareSize;
int endRow = redrawRect.bottom() / squareSize;
int beginColumn = redrawRect.left() / squareSize;
int endColumn = redrawRect.right() / squareSize;
//! [7]
//! [8]
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);
}
//! [8] //! [9]
}
//! [9]
//! [10]
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.horizontalAdvance(QChar(key)) / 2,
row * squareSize + 4 + fontMetrics.ascent(),
QString(QChar(key)));
}
}
}
//! [10]
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