QGIS API Documentation 3.40.0-Bratislava (b56115d8743)
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characterwidget.cpp
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45
46#include "characterwidget.h"
47#include "qgsapplication.h"
48#include "qgsfontutils.h"
49
50#include <QFontDatabase>
51#include <QMouseEvent>
52#include <QPaintEvent>
53#include <QPainter>
54#include <QPen>
55#include <QPoint>
56#include <QScrollArea>
57#include <QScrollBar>
58#include <QToolTip>
59
61 : QWidget( parent )
62{
63 setMouseTracking( true );
64 setFocusPolicy( Qt::StrongFocus );
65}
66
67void CharacterWidget::setFont( const QFont &font )
68{
69 QgsFontUtils::setFontFamily( mDisplayFont, font.family() );
70 mSquareSize = std::max( 34, QFontMetrics( mDisplayFont ).xHeight() * 3 );
71 adjustSize();
72 update();
73}
74
75void CharacterWidget::setFontSize( double fontSize )
76{
77 mDisplayFont.setPointSizeF( fontSize );
78 mSquareSize = std::max( 34, QFontMetrics( mDisplayFont ).xHeight() * 3 );
79 adjustSize();
80 update();
81}
82
83void CharacterWidget::setFontStyle( const QString &fontStyle )
84{
85 const QFontDatabase fontDatabase;
86 const QFont::StyleStrategy oldStrategy = mDisplayFont.styleStrategy();
87 mDisplayFont = fontDatabase.font( mDisplayFont.family(), fontStyle, mDisplayFont.pointSize() );
88 mDisplayFont.setStyleStrategy( oldStrategy );
89 mSquareSize = std::max( 34, QFontMetrics( mDisplayFont ).xHeight() * 3 );
90 adjustSize();
91 update();
92}
93
95{
96 if ( enable )
97 mDisplayFont.setStyleStrategy( QFont::PreferDefault );
98 else
99 mDisplayFont.setStyleStrategy( QFont::NoFontMerging );
100 adjustSize();
101 update();
102}
103
105{
106 if ( mColumns == columns || columns < 1 )
107 return;
108 mColumns = columns;
109 adjustSize();
110 update();
111}
112
113void CharacterWidget::setCharacter( QChar character )
114{
115 const bool changed = character.unicode() != mLastKey;
116 mLastKey = character.isNull() ? -1 : character.unicode();
117 QWidget *widget = parentWidget();
118 if ( widget )
119 {
120 QScrollArea *scrollArea = qobject_cast< QScrollArea *>( widget->parent() );
121 if ( scrollArea && mLastKey < 65536 )
122 {
123 scrollArea->ensureVisible( 0, mLastKey / mColumns * mSquareSize );
124 }
125 }
126 if ( changed )
127 emit characterSelected( mLastKey >= 0 ? QChar( mLastKey ) : QChar() );
128
129 update();
130}
131
133{
134 mLastKey = -1;
135 update();
136}
137
139{
140 return QSize( mColumns * mSquareSize, ( 65536 / mColumns ) * mSquareSize );
141}
142
143void CharacterWidget::keyPressEvent( QKeyEvent *event )
144{
145 const QFontMetrics fm( mDisplayFont );
146
147 if ( event->key() == Qt::Key_Right )
148 {
149 int next = std::min( mLastKey + 1, 0xfffc );
150 while ( next < 0xfffc && !fm.inFont( QChar( next ) ) )
151 {
152 next++;
153 }
154 setCharacter( QChar( next ) );
155 }
156 else if ( event->key() == Qt::Key_Left )
157 {
158 int next = mLastKey - 1;
159 while ( next > 0 && !fm.inFont( QChar( next ) ) )
160 {
161 next--;
162 }
163 setCharacter( QChar( next ) );
164 }
165 else if ( event->key() == Qt::Key_Down )
166 {
167 int next = std::min( mLastKey + mColumns, 0xfffc );
168 while ( next < 0xfffc && !fm.inFont( QChar( next ) ) )
169 {
170 next = std::min( next + mColumns, 0xfffc );
171 }
172 setCharacter( QChar( next ) );
173 }
174 else if ( event->key() == Qt::Key_Up )
175 {
176 int next = std::max( 0, mLastKey - mColumns );
177 while ( next > 0 && !fm.inFont( QChar( next ) ) )
178 {
179 next = std::max( 0, next - mColumns );
180 }
181 setCharacter( QChar( next ) );
182 }
183 else if ( event->key() == Qt::Key_Home )
184 {
185 int next = 0;
186 while ( next < 0xfffc && !fm.inFont( QChar( next ) ) )
187 {
188 next++;
189 }
190 setCharacter( QChar( next ) );
191 }
192 else if ( event->key() == Qt::Key_End )
193 {
194 int next = 0xfffc;
195 while ( next > 0 && !fm.inFont( QChar( next ) ) )
196 {
197 next--;
198 }
199 setCharacter( QChar( next ) );
200 }
201 else if ( !event->text().isEmpty() )
202 {
203 QChar chr = event->text().at( 0 );
204 if ( chr.unicode() != mLastKey )
205 {
206 setCharacter( chr );
207 }
208 }
209}
210
211void CharacterWidget::mouseMoveEvent( QMouseEvent *event )
212{
213 const QPoint widgetPosition = mapFromGlobal( event->globalPos() );
214 const uint key = ( widgetPosition.y() / mSquareSize ) * mColumns + widgetPosition.x() / mSquareSize;
215
216 const QString text = QStringLiteral( "<p style=\"text-align: center; font-size: 24pt; font-family: %1\">%2</p><p><table><tr><td>%3</td><td>%2</td></tr><tr><td>%4</td><td>%5</td></tr><tr><td>%6</td><td>0x%7</td></tr></table>" )
217 .arg( mDisplayFont.family() )
218 .arg( QChar( key ) )
219 .arg( tr( "Character" ),
220 tr( "Decimal" ) )
221 .arg( key )
222 .arg( tr( "Hex" ),
223 QString::number( key, 16 ) );
224 QToolTip::showText( event->globalPos(), text, this );
225}
226
227void CharacterWidget::mousePressEvent( QMouseEvent *event )
228{
229 if ( event->button() == Qt::LeftButton )
230 {
231 mLastKey = ( event->y() / mSquareSize ) * mColumns + event->x() / mSquareSize;
232 if ( QChar( mLastKey ).category() != QChar::Other_NotAssigned )
233 emit characterSelected( QChar( mLastKey ) );
234 update();
235 }
236 else
237 QWidget::mousePressEvent( event );
238}
239
240void CharacterWidget::paintEvent( QPaintEvent *event )
241{
242 QPainter painter( this );
243 painter.setFont( mDisplayFont );
244
245 const QFontMetrics fontMetrics( mDisplayFont );
246
247 const QRect redrawRect = event->rect();
248 const int beginRow = redrawRect.top() / mSquareSize;
249 const int endRow = redrawRect.bottom() / mSquareSize;
250 const int beginColumn = redrawRect.left() / mSquareSize;
251 const int endColumn = std::min( mColumns - 1, redrawRect.right() / mSquareSize );
252
253 const QPalette palette = qApp->palette();
254 painter.setPen( QPen( palette.color( QPalette::Mid ) ) );
255 for ( int row = beginRow; row <= endRow; ++row )
256 {
257 for ( int column = beginColumn; column <= endColumn; ++column )
258 {
259 const int key = row * mColumns + column;
260 painter.setBrush( fontMetrics.inFont( QChar( key ) ) ? QBrush( palette.color( QPalette::Base ) ) : Qt::NoBrush );
261 painter.drawRect( column * mSquareSize, row * mSquareSize, mSquareSize, mSquareSize );
262 }
263 }
264
265 for ( int row = beginRow; row <= endRow; ++row )
266 {
267 for ( int column = beginColumn; column <= endColumn; ++column )
268 {
269 const int key = row * mColumns + column;
270 painter.setClipRect( column * mSquareSize, row * mSquareSize, mSquareSize, mSquareSize );
271 painter.setPen( QPen( palette.color( key == mLastKey ? QPalette::HighlightedText : QPalette::WindowText ) ) );
272
273 if ( key == mLastKey )
274 painter.fillRect( column * mSquareSize + 1, row * mSquareSize + 1, mSquareSize, mSquareSize, QBrush( palette.color( QPalette::Highlight ) ) );
275
276 if ( fontMetrics.inFont( QChar( key ) ) )
277 {
278 painter.drawText( column * mSquareSize + ( mSquareSize / 2 ) - fontMetrics.boundingRect( QChar( key ) ).width() / 2,
279 row * mSquareSize + 4 + fontMetrics.ascent(),
280 QString( QChar( key ) ) );
281 }
282 }
283 }
284}
285
286void CharacterWidget::resizeEvent( QResizeEvent *event )
287{
288 mColumns = event->size().width() / mSquareSize;
289 QWidget::resizeEvent( event );
290}
void updateFontMerging(bool enable)
void keyPressEvent(QKeyEvent *event) override
void characterSelected(QChar character)
Emitted when a character is selected in the widget.
void setFontStyle(const QString &fontStyle)
Sets the font style to show in the widget.
void setCharacter(QChar character)
Sets the currently selected character in the widget.
void setFont(const QFont &font)
Sets the font to show in the widget.
void mousePressEvent(QMouseEvent *event) override
QSize sizeHint() const override
void paintEvent(QPaintEvent *event) override
CharacterWidget(QWidget *parent=nullptr)
Constructor for CharacterWidget.
void setFontSize(double fontSize)
Sets the font size (in points) to render in the widget.
void clearCharacter()
Clears the currently selected character in the widget.
void setColumns(int columns)
Sets the number of columns of characters to show in the widget.
void resizeEvent(QResizeEvent *event) override
void mouseMoveEvent(QMouseEvent *event) override
static void setFontFamily(QFont &font, const QString &family)
Sets the family for a font object.