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50
51#include "characterwidget.h"
52
53#include <QFontDatabase>
54#include <QMouseEvent>
55#include <QPainter>
56#include <QToolTip>
57
58//! [0]
59CharacterWidget::CharacterWidget(QWidget *parent)
60 : QWidget(parent)
61{
62 calculateSquareSize();
63 setMouseTracking(true);
64}
65//! [0]
66
67//! [1]
68void CharacterWidget::updateFont(const QFont &font)
69{
70 displayFont.setFamily(font.family());
71 calculateSquareSize();
72 adjustSize();
73 update();
74}
75//! [1]
76
77//! [2]
78void CharacterWidget::updateSize(const QString &fontSize)
79{
80 displayFont.setPointSize(fontSize.toInt());
81 calculateSquareSize();
82 adjustSize();
83 update();
84}
85//! [2]
86
87void CharacterWidget::updateStyle(const QString &fontStyle)
88{
89 QFontDatabase fontDatabase;
90 const QFont::StyleStrategy oldStrategy = displayFont.styleStrategy();
91 displayFont = fontDatabase.font(family: displayFont.family(), style: fontStyle, pointSize: displayFont.pointSize());
92 displayFont.setStyleStrategy(oldStrategy);
93 calculateSquareSize();
94 adjustSize();
95 update();
96}
97
98void CharacterWidget::updateFontMerging(bool enable)
99{
100 if (enable)
101 displayFont.setStyleStrategy(QFont::PreferDefault);
102 else
103 displayFont.setStyleStrategy(QFont::NoFontMerging);
104 adjustSize();
105 update();
106}
107
108void CharacterWidget::calculateSquareSize()
109{
110 squareSize = qMax(a: 16, b: 4 + QFontMetrics(displayFont, this).height());
111}
112
113//! [3]
114QSize CharacterWidget::sizeHint() const
115{
116 return QSize(columns*squareSize, (65536 / columns) * squareSize);
117}
118//! [3]
119
120//! [4]
121void CharacterWidget::mouseMoveEvent(QMouseEvent *event)
122{
123 QPoint widgetPosition = mapFromGlobal(event->globalPos());
124 uint key = (widgetPosition.y() / squareSize) * columns + widgetPosition.x() / squareSize;
125
126 QString text = QString::fromLatin1(str: "<p>Character: <span style=\"font-size: 24pt; font-family: %1\">").arg(a: displayFont.family())
127 + QChar(key)
128 + QString::fromLatin1(str: "</span><p>Value: 0x")
129 + QString::number(key, base: 16);
130 QToolTip::showText(pos: event->globalPos(), text, w: this);
131}
132//! [4]
133
134//! [5]
135void CharacterWidget::mousePressEvent(QMouseEvent *event)
136{
137 if (event->button() == Qt::LeftButton) {
138 lastKey = (event->y() / squareSize) * columns + event->x() / squareSize;
139 if (QChar(lastKey).category() != QChar::Other_NotAssigned)
140 emit characterSelected(character: QString(QChar(lastKey)));
141 update();
142 }
143 else
144 QWidget::mousePressEvent(event);
145}
146//! [5]
147
148//! [6]
149void CharacterWidget::paintEvent(QPaintEvent *event)
150{
151 QPainter painter(this);
152 painter.fillRect(event->rect(), QBrush(Qt::white));
153 painter.setFont(displayFont);
154//! [6]
155
156//! [7]
157 QRect redrawRect = event->rect();
158 int beginRow = redrawRect.top() / squareSize;
159 int endRow = redrawRect.bottom() / squareSize;
160 int beginColumn = redrawRect.left() / squareSize;
161 int endColumn = redrawRect.right() / squareSize;
162//! [7]
163
164//! [8]
165 painter.setPen(QPen(Qt::gray));
166 for (int row = beginRow; row <= endRow; ++row) {
167 for (int column = beginColumn; column <= endColumn; ++column) {
168 painter.drawRect(x: column * squareSize, y: row * squareSize, w: squareSize, h: squareSize);
169 }
170//! [8] //! [9]
171 }
172//! [9]
173
174//! [10]
175 QFontMetrics fontMetrics(displayFont);
176 painter.setPen(QPen(Qt::black));
177 for (int row = beginRow; row <= endRow; ++row) {
178 for (int column = beginColumn; column <= endColumn; ++column) {
179 int key = row * columns + column;
180 painter.setClipRect(x: column * squareSize, y: row * squareSize, w: squareSize, h: squareSize);
181
182 if (key == lastKey)
183 painter.fillRect(x: column * squareSize + 1, y: row * squareSize + 1,
184 w: squareSize, h: squareSize, b: QBrush(Qt::red));
185
186 painter.drawText(x: column * squareSize + (squareSize / 2) -
187 fontMetrics.horizontalAdvance(QChar(key)) / 2,
188 y: row * squareSize + 4 + fontMetrics.ascent(),
189 s: QString(QChar(key)));
190 }
191 }
192}
193//! [10]
194

source code of qtbase/examples/widgets/widgets/charactermap/characterwidget.cpp