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Archived:How to select a color using QColorDialog

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axeljaeger (Talk | contribs)
(Removed unneccessary deletes in favor of Qt)
Line 35: Line 35:
 
     : QDialog(parent)
 
     : QDialog(parent)
 
{
 
{
button = new QPushButton("Select Color");
+
button = new QPushButton("Select Color", this);
 
connect(button, SIGNAL(clicked()), this, SLOT(setcolor()));
 
connect(button, SIGNAL(clicked()), this, SLOT(setcolor()));
 
 
colorLabel =new QLabel;
+
colorLabel =new QLabel(this);
layout = new QVBoxLayout;
+
layout = new QVBoxLayout(this);
 
layout->addWidget(button);
 
layout->addWidget(button);
 
layout->addWidget(colorLabel);
 
layout->addWidget(colorLabel);
Line 47: Line 47:
 
dialogcolor::~dialogcolor()
 
dialogcolor::~dialogcolor()
 
{
 
{
  if(button)
+
// No need to delete any object that got a parent that is properly deleted.
  {
+
    delete button;
+
  }
+
  if(colorlabel)
+
  {
+
    delete colorlabel;
+
  }
+
  if(layout)
+
  {
+
    delete layout;
+
  }
+
 
+
 
}
 
}
 
void dialogcolor::setcolor()
 
void dialogcolor::setcolor()

Revision as of 16:20, 30 July 2009


Article Metadata
Tested with
Devices(s): Emulator
Compatibility
Platform(s): S60 3rd Edition FP1, S60 3rd Edition FP2, S60 5th Edition
Symbian
Article
Keywords: QColorDialog,QColor,QPalette,QLabel
Created: (28 Jan 2009)
Last edited: axeljaeger (30 Jul 2009)


Overview

This code snippet demonstrates how to allow user to select a color of his choice and use it as either a background or foreground color in Qt for S60.

Qt provides a QColorDialog class for performing this task.

Preconditions


Source File

#include "dialogcolor.h"
 
dialogcolor::dialogcolor(QWidget *parent)
: QDialog(parent)
{
button = new QPushButton("Select Color", this);
connect(button, SIGNAL(clicked()), this, SLOT(setcolor()));
 
colorLabel =new QLabel(this);
layout = new QVBoxLayout(this);
layout->addWidget(button);
layout->addWidget(colorLabel);
setLayout(layout);
}
 
dialogcolor::~dialogcolor()
{
// No need to delete any object that got a parent that is properly deleted.
}
void dialogcolor::setcolor()
{
QColor color = QColorDialog::getColor(Qt::green, this);
if (color.isValid())
{
colorLabel->setText(color.name());
colorLabel->setPalette(QPalette(color));
colorLabel->setAutoFillBackground(true);
}
}

Header File

#ifndef DIALOGCOLOR_H
#define DIALOGCOLOR_H
 
#include <QtGui/QDialog>
#include "ui_dialogcolor.h"
#include <QPushButton>
#include <QColorDialog>
#include <QLabel>
#include <QVBoxLayout>
#include <QString>
 
class dialogcolor : public QDialog
{
Q_OBJECT
 
public:
dialogcolor(QWidget *parent = 0);
~dialogcolor();
private slots:
void setcolor();
 
private:
QString str;
QPushButton *button;
QLabel *colorLabel;
QVBoxLayout *layout;
 
 
};
 
#endif // DIALOGCOLOR_H

Screenshot

QColorDialog

Colordialog.JPG


Co.JPG


Co1.JPG

QColorDialog

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