I'm trying to create a dynamic QSlider that accepts a QVector of integer values and maps them underneath the QSlider relative to what position they represent.
Here's a screenshot of what I have now: My Slider http://dev.kyleswebspace.com/images/QInteractiveSlider.jpg
As you can see, the ticks don't line up with their values. This is one of the issues.
The main issue I'm struggling with though, is that no matter what I change my PADDING value to (see qinteractiveslider.h), the QSlider in my widget remains the same size in relation to the grid of values.
- Why isn't my QGridLayout's arguments providing the correct amount of padding?
- How can I enforce these margins on the QSlider?
- Is there a better way of positioning these labels? I'm open to suggestions.
Here is the code:
qinteractiveslider.h
#ifndef QINTERACTIVESLIDER_H
#define QINTERACTIVESLIDER_H
#include <QtGui/QGridLayout>
#include <QtGui/QLabel>
#include <QtGui/QSlider>
#include <QtGui/QWidget>
class QInteractiveSlider : public QWidget
{
Q_OBJECT
public:
QInteractiveSlider(QVector<int>* values, int min, int max, QWidget *parent = 0, Qt::WFlags flags = 0);
~QInteractiveSlider();
private:
static const int GRID_WIDTH = 10000;
static const int PADDING = GRID_WIDTH / 3;
QGridLayout* m_layout;
QSlider* m_slider;
QVector<int>* m_values;
};
qinteractiveslider.cpp
#include "qinteractiveslider.h"
QInteractiveSlider::QInteractiveSlider(QVector<int>* values, int min, int max, QWidget *parent, Qt::WFlags flags)
: QWidget(parent, flags)
{
m_layout = new QGridLayout();
m_layout->setSpacing(0);
m_slider = new QSlider(Qt::Horizontal);
m_slider->setTickInterval(25);
m_slider->setTickPosition(QSlider::TicksBelow);
m_layout->addWidget(m_slider, 0, PADDING, 1, GRID_WIDTH - PADDING, Qt::AlignBottom);
//populate bottom row with labels
QVector<int>::Iterator iterator = values->begin();
while(iterator != values->end()) {
//place the label at the relative position under the slider
int columnIndex = ((double)*iterator / (double)max) * (double)GRID_WIDTH;
QString labelString = QString::number(*iterator);
QLabel* label = new QLabel(labelString);
m_layout->addWidget(label, 1, columnIndex, 1, 1, Qt::AlignTop);
iterator++;
}
this->setLayout(m_layout);
}
QInteractiveSlider::~QInteractiveSlider()
{
}
main.cpp
#include "qinteractiveslider.h"
#include <QtGui/QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QVector<int>* testVector = new QVector<int>();
testVector->append(0);
testVector->append(50);
testVector->append(25);
testVector->append(100);
QInteractiveSlider* w = new QInteractiveSlider(testVector, 0, 100);
w->show();
return a.exec();
}
