Elided Label: Difference between revisions

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Just call this function and you're good to go.
[[Category:Snippets::Misc]]
{{LangSwitch}}
Make sure to set the horizontal size policy to minimum and just call this function and you're good to go:


<code><br />//! Set the elide mode used for displaying text.<br /> void setElideMode(Qt::TextElideMode elideMode) {<br /> elideMode_ = elideMode;<br /> updateGeometry();<br /> }<br /></code>
<code>
// Set the elide mode used for displaying text.
void ElidedLabel::setElideMode(Qt::TextElideMode elideMode)
{
    m_elideMode = elideMode;
    m_cachedText.clear();
    update();
}
</code>


<code>#ifndef ELIDEDLABEL_H<br />#define ELIDEDLABEL_H
<code>
#ifndef ELIDEDLABEL_H
#define ELIDEDLABEL_H


#include &lt;QLabel&amp;gt;
#include <QLabel>


/*<br />MIT - Yash : Speedovation.com [ Picked from internet and modified. if owner needs to add or change license do let me know.]<br />*/
// MIT - Yash : Speedovation.com [ Picked from internet and modified. if owner needs to add or change license do let me know.]


class ElidedLabel : public QLabel {<br /> Q_OBJECT
class ElidedLabel : public QLabel  
{
    Q_OBJECT
public:
    using QLabel::QLabel;
    // Set the elide mode used for displaying text.
    void setElideMode(Qt::TextElideMode elideMode);
    // Get the elide mode currently used to display text.
    Qt::TextElideMode elideMode() const { return m_elideMode; }


public:<br /> ElidedLabel(QWidget '''parent = 0, Qt::WindowFlags f = 0);<br /> ElidedLabel(const QString &amp;txt, QWidget''' parent = 0, Qt::WindowFlags f = 0);<br /> ElidedLabel(const QString &amp;txt,<br /> Qt::TextElideMode elideMode = Qt::ElideRight,<br /> QWidget * parent = 0,<br /> Qt::WindowFlags f = 0);
protected:
    void paintEvent(QPaintEvent *e) override;
    void resizeEvent(QResizeEvent *e) override;


public:<br /> //! Set the elide mode used for displaying text.<br /> void setElideMode(Qt::TextElideMode elideMode) {<br /> elideMode_ = elideMode;<br /> updateGeometry();<br /> }
private:
    void updateCachedTexts();


//! Get the elide mode currently used to display text.<br /> Qt::TextElideMode elideMode() const { return elideMode_; }
private:
    Qt::TextElideMode m_elideMode = Qt::ElideRight;
    QString m_cachedElidedText;
    QString m_cachedText;
};


public: // QLabel overrides<br /> void setText(const QString &amp;);
#endif // ELIDEDLABEL_HPP
</code>


protected: // QLabel overrides<br /> void paintEvent(QPaintEvent ''');<br /> void resizeEvent(QResizeEvent''');
<code>
#include "ElidedLabel.h"


protected:<br /> //! Cache the elided text so as to not recompute it every paint event<br /> void cacheElidedText(int w);
#include <QPaintEvent>
#include <QResizeEvent>


private:<br /> Qt::TextElideMode elideMode_;<br /> QString cachedElidedText;<br />};
void ElidedLabel::setElideMode(Qt::TextElideMode elideMode)
{
    m_elideMode = elideMode;
    m_cachedText.clear();
    update();
}


#endif // ELIDEDLABEL_HPP<br /></code>
void ElidedLabel::resizeEvent(QResizeEvent *e)
{
    QLabel::resizeEvent(e);
    m_cachedText.clear();
}


<code>#include &quot;ElidedLabel.h&amp;quot;
void ElidedLabel::paintEvent(QPaintEvent *e)
{
    if (m_elideMode == Qt::ElideNone)
        return QLabel::paintEvent(e);


#include &lt;QDebug&amp;gt;<br />#include &lt;QPainter&amp;gt;<br />#include &lt;QResizeEvent&amp;gt;
    updateCachedTexts();
    QLabel::setText(m_cachedElidedText);
    QLabel::paintEvent(e);
    QLabel::setText(m_cachedText);
}


ElidedLabel::ElidedLabel(QWidget *parent, Qt::WindowFlags f)<br /> : QLabel(parent, f) , elideMode_(Qt::ElideRight)<br />{<br /> // setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Preferred);<br />}
void ElidedLabel::updateCachedTexts()
 
{
ElidedLabel::ElidedLabel(const QString &amp;txt, QWidget *parent, Qt::WindowFlags f)<br /> : QLabel(txt, parent, f) , elideMode_(Qt::ElideRight)<br />{<br />}
    // setText() is not virtual ... :/
 
    const auto txt = text();
ElidedLabel::ElidedLabel(const QString &amp;txt, Qt::TextElideMode elideMode,<br /> QWidget *parent, Qt::WindowFlags f) : QLabel(txt, parent, f)<br /> , elideMode_(elideMode)<br />{<br />}
    if (m_cachedText == txt)
 
        return;
void ElidedLabel::setText(const QString &amp;txt) {<br /> QLabel::setText(txt);<br /> cacheElidedText(geometry().width());<br />}
    m_cachedText = txt;
 
    const QFontMetrics fm(fontMetrics());
void ElidedLabel::cacheElidedText(int w) {<br /> cachedElidedText = fontMetrics().elidedText(text(), elideMode_, w, Qt::TextShowMnemonic);<br />}
    m_cachedElidedText = fm.elidedText(text(),
 
                                      m_elideMode,
void ElidedLabel::resizeEvent(QResizeEvent *e) {<br /> QLabel::resizeEvent(e);<br /> cacheElidedText(e-&gt;size().width());<br />}
                                      width(),
 
                                      Qt::TextShowMnemonic);
void ElidedLabel::paintEvent(QPaintEvent *e) {<br /> if(elideMode_ == Qt::ElideNone) {<br /> QLabel::paintEvent(e);<br /> } else {<br /> QPainter p(this);<br /> p.drawText(0, 0,<br /> geometry().width(),<br /> geometry().height(),<br /> alignment(),<br /> cachedElidedText);<br /> }<br />}
    // make sure to show at least the first character
    if (!m_cachedText.isEmpty())
    {
      const QString showFirstCharacter = m_cachedText.at(0) + QStringLiteral("...");
      setMinimumWidth(fm.horizontalAdvance(showFirstCharacter) + 1);
    }
}


</code>
</code>

Revision as of 12:46, 17 December 2018

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Make sure to set the horizontal size policy to minimum and just call this function and you're good to go:

// Set the elide mode used for displaying text.
void ElidedLabel::setElideMode(Qt::TextElideMode elideMode)
{
    m_elideMode = elideMode;
    m_cachedText.clear();
    update();
}
#ifndef ELIDEDLABEL_H
#define ELIDEDLABEL_H

#include <QLabel>

// MIT - Yash : Speedovation.com [ Picked from internet and modified. if owner needs to add or change license do let me know.]

class ElidedLabel : public QLabel 
{
    Q_OBJECT
public:
    using QLabel::QLabel;
    // Set the elide mode used for displaying text.
    void setElideMode(Qt::TextElideMode elideMode);
    // Get the elide mode currently used to display text.
    Qt::TextElideMode elideMode() const { return m_elideMode; }

protected:
    void paintEvent(QPaintEvent *e) override;
    void resizeEvent(QResizeEvent *e) override;

private:
    void updateCachedTexts();

private:
    Qt::TextElideMode m_elideMode = Qt::ElideRight;
    QString m_cachedElidedText;
    QString m_cachedText;
};

#endif // ELIDEDLABEL_HPP
#include "ElidedLabel.h"

#include <QPaintEvent>
#include <QResizeEvent>

void ElidedLabel::setElideMode(Qt::TextElideMode elideMode)
{
    m_elideMode = elideMode;
    m_cachedText.clear();
    update();
}

void ElidedLabel::resizeEvent(QResizeEvent *e)
{
    QLabel::resizeEvent(e);
    m_cachedText.clear();
}

void ElidedLabel::paintEvent(QPaintEvent *e)
{
    if (m_elideMode == Qt::ElideNone)
        return QLabel::paintEvent(e);

    updateCachedTexts();
    QLabel::setText(m_cachedElidedText);
    QLabel::paintEvent(e);
    QLabel::setText(m_cachedText);
}

void ElidedLabel::updateCachedTexts()
{
    // setText() is not virtual ... :/
    const auto txt = text();
    if (m_cachedText == txt)
        return;
    m_cachedText = txt;
    const QFontMetrics fm(fontMetrics());
    m_cachedElidedText = fm.elidedText(text(),
                                       m_elideMode,
                                       width(),
                                       Qt::TextShowMnemonic);
    // make sure to show at least the first character
    if (!m_cachedText.isEmpty())
    {
      const QString showFirstCharacter = m_cachedText.at(0) + QStringLiteral("...");
      setMinimumWidth(fm.horizontalAdvance(showFirstCharacter) + 1);
    }
}