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elidedlabel.cpp
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50 
51 #include "elidedlabel.h"
52 
53 #include <QPainter>
54 #include <QSizePolicy>
55 #include <QTextLayout>
56 
57 
58 ElidedLabel::ElidedLabel(QWidget *parent)
59  : QFrame(parent)
60  , elided(false)
61 {
63 }
64 
66 ElidedLabel::ElidedLabel(const QString &text, QWidget *parent) :
67  ElidedLabel(parent)
68 {
69  content = text;
70 }
72 
74 void ElidedLabel::setText(const QString &newText)
75 {
76  content = newText;
77  update();
78 }
80 
82 {
83  return fontMetrics().size(0, content);
84 }
85 
88 {
89  QFrame::paintEvent(event);
90 
91  QPainter painter(this);
93 
94  bool didElide = false;
95  int lineSpacing = fontMetrics.lineSpacing();
96  int y = 0;
97 
98  QTextLayout textLayout(content, painter.font());
99  textLayout.beginLayout();
100  forever {
101  QTextLine line = textLayout.createLine();
102 
103  if (!line.isValid())
104  break;
105 
106  line.setLineWidth(width());
107  int nextLineY = y + lineSpacing;
108 
109  if (height() >= nextLineY + lineSpacing) {
110  line.draw(&painter, QPoint(0, y));
111  y = nextLineY;
114  } else {
115  QString lastLine = content.mid(line.textStart());
116  QString elidedLastLine = fontMetrics.elidedText(lastLine, Qt::ElideRight, width());
117  painter.drawText(QPoint(0, y + fontMetrics.ascent()), elidedLastLine);
118  line = textLayout.createLine();
119  didElide = line.isValid();
120  break;
121  }
122  }
123  textLayout.endLayout();
125 
127  if (didElide != elided) {
128  elided = didElide;
129  emit elisionChanged(didElide);
130  }
131 }
int ascent() const const
const QFont & font() const const
int y() const const
void setText(const QString &text)
[0]
Definition: elidedlabel.cpp:74
void update()
void beginLayout()
void setLineWidth(qreal width)
int width() const const
virtual void paintEvent(QPaintEvent *) override
QString elidedText(const QString &text, Qt::TextElideMode mode, int width, int flags) const const
virtual QSize sizeHint() const override
[1]
Definition: elidedlabel.cpp:81
void drawText(const QPointF &position, const QString &text)
int textStart() const const
void setSizePolicy(QSizePolicy)
QString mid(int position, int n) const const
QFontMetrics fontMetrics() const const
QFontMetrics fontMetrics() const const
ElideRight
bool isValid() const const
QSize size(int flags, const QString &text, int tabStops, int *tabArray) const const
QObject * parent() const const
void paintEvent(QPaintEvent *event) override
[2]
Definition: elidedlabel.cpp:87
int lineSpacing() const const
int height() const const
void draw(QPainter *painter, const QPointF &position, const QTextLayout::FormatRange *selection) const const