[Qt-interest] QAbstractSpinBox question

[Malyushytsky, Alex]

Spin box is complex control, which uses QLineEdit.

So I guess you need to set background color for
QAbstractSpinBox::lineEdit()

To get the pointer to line edit  correctly you need to subclass QAbstractSpinBox.

But you don't have to if you use QObject functionality, something like:

QAbstractSpinBox* spinBox =...; // your spinbox

QLineEdit  * edit = spinBox ->findChild< QLineEdit *>( QLatin1String("qt_spinbox_lineedit"));

Regards,

Alex



From: qt-interest-bounces+alex=wai.com at qt.nokia.com [mailto:qt-interest-bounces+alex=wai.com at qt.nokia.com] On Behalf Of Doug Stewart
Sent: Tuesday, September 06, 2011 6:17 PM
To: Qt Interest
Subject: [Qt-interest] QAbstractSpinBox question

I am new to qt and C++ === so any suggestions will be appreciated.


I am trying to make a text spinbox from QAbstractSpinBox such that the color of each item
in the spinbox is different. So far I have the forground text changing color like I want it by using
QPalette::Text
I then tried to change the background color by using

QPalette::Window    but this does not work.


Is there a way to change the background color in my textspinbox?



Doug







This is  textspinbox.cpp




#include "textspinbox.h"
#include <QAbstractSpinBox>
#include <QDebug>
#include <QPalette>
TextSpinBox::TextSpinBox(QWidget* parent)
    : QAbstractSpinBox(parent), m_list(0), m_index(0), m_colorMap()
{
    this->setWrapping(true);
    this->stepEnabled();
    this->setMinimumSize(150, 30);
    connect(this, SIGNAL(colorChanged(QString)),
            this, SLOT(colorChangedSlot(QString)));
}
TextSpinBox::~TextSpinBox()
{
    /* Set the pointer to null, and then the stack part of it will be
     * handled regularly.*/
    m_list = 0;
}
void TextSpinBox::setText(const QString& text)
{
    if(m_list != 0)
    {
       m_index = m_list->indexOf(text);
       this->lineEdit()->setText(m_list->at(m_index));
       setColourMap();
       emit colorChanged(m_list->at(m_index));
   }
   else
       qDebug() << "The TextSpinBog QStringList is not initialized properly.";
}
/* This is the best way, and most secure way of setting up the spin box. */
void TextSpinBox::init(const QStringList &list, const QString &text)
{
    m_list = &list;
    m_index = m_list->indexOf(text);
    this->lineEdit()->setText(m_list->at(m_index));
    setColourMap();
    emit colorChanged(m_list->at(m_index));
}
void TextSpinBox::stepBy(int steps)
{
    m_index += steps;
    if( m_index >= m_list->size() )
        m_index = 0;
    else if( m_index < 0 )
        m_index = m_list->size()-1;
    this->lineEdit()->setText( m_list->at(m_index) );
    emit colorChanged(m_list->at(m_index));
    emit textChanged();
}
QAbstractSpinBox::StepEnabled TextSpinBox::stepEnabled() const
{
    return QAbstractSpinBox::StepDownEnabled|QAbstractSpinBox::StepUpEnabled;
}
void TextSpinBox::colorChangedSlot(QString text)
{
    //qDebug() << " Colour was changed.";
    QPalette p = this->palette();
    p.setColor(QPalette::Text, m_colorMap.value(text));
    setPalette(p);
}
void TextSpinBox::setColourMap()
{
    int size = 128 / m_list->size();
    for (int i = m_list->size() -1 ; i >= 0 ; i--)
    {
        /*These colours are hard coded to try to match the present
          octave colour settings in a different part of the program.
         */
        QColor color( 30, 127 + i*size, 127 - i*size);
        m_colorMap.insert(m_list->at(i), color);
    }
}

--
DAS

https://linuxcounter.net/user/206392.html


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