Clipboard operations using Qt

Comments

13 Sep
2009

Article Review by deepikagohil (20090913)

In General terms, Clipboad is a softwaree facility that can be used for short term data storage and/or data transfer between documents or applications. Simply it is used to copy and paste data between applications. This artilce covers the clipboard application in Qt for Symbian.

The artilce provides the source-code for the clipboard application in Qt and a short guide to explain the same. The screen-shots are also added in the article. The source-code is in arranged and proper manner, so easy to understand. The main API used in the article is QCliboard.

The article shows the basi clipboard application, which can be useful to beginners as well as intermediate developers.

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The Qt clipboard offers a simple mechanism to copy and paste data between different applications or between the same widget in am application. QClipboard supports the same data types as QDrag, and uses similar mechanisms.

Article Metadata

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Tested with

Devices(s): S60 for Emulator

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Compatibility

Platform(s): S60 3rd Edition, FP1, FP2
S60 5th Edition

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Article

Keywords: QClipboard

Created: mind_freak (09 Jul 2009)

Last edited: hamishwillee (11 Oct 2012)

Source code

Note: This code is used only to copy the text content, code for MIME data is shown later in this section.

Header File

#ifndef BOARD_H
#define BOARD_H
 
#include <QtGui/QWidget>
#include<QClipboard>
#include<QString>
#include<QLineEdit>
#include<QPushButton>
#include<QVBoxLayout>
#include<QApplication>
#include<QMessageBox>
class board : public QWidget
{
    Q_OBJECT
 
public:
    board(QWidget *parent = 0);
    ~board();
private slots:
    void copy();
    void paste();
private:
    QLineEdit *edit;
    QPushButton *but;
    QPushButton *but1;
    QLineEdit *edit1;
    QVBoxLayout *lay;
    QClipboard *cb;
    QString str;
    QString str1;
    QMessageBox *box;
 
 
};
 
#endif // BOARD_H

Source File

#include "board.h"
 
board::board(QWidget *parent)
    : QWidget(parent)
{
 
    edit=new QLineEdit();
 
     box=new QMessageBox(this);
     but=new QPushButton(tr("Copy"),this);
    but1=new QPushButton(tr("Paste"),this);
    edit1=new QLineEdit(this);
 
    lay=new QVBoxLayout(this);
    cb=QApplication::clipboard();
    setStyleSheet("* { background-color:rgb(0,0,0);color:rgb(255,255,255); padding: 7px}}");
    QObject::connect(but,SIGNAL(clicked()),this,SLOT(copy()));
    QObject::connect(but1,SIGNAL(clicked()),this,SLOT(paste()));
    lay->addWidget(edit);
    lay->addWidget(but);
    lay->addWidget(but1);
    lay->addWidget(edit1);
 
 
    setLayout(lay);
    showMaximized();
 
}
 
board::~board()
{
 // No need to delete any object that got a parent that is properly deleted.
}
void board::copy()
{
 
    str=edit->text();
    cb->setText(str);//Text copied to clipboard
    box->setText("Text copied to clipboard");
    box->exec();
 
 
}
void board::paste()
{
    str1=cb->text();//text reterived from clipboard
    edit1->setText(str1);
}

Advance clipboard(MIME data manipulation)

• Copying of MIME data

void board::copy()
{
    QApplication::clipboard()->setData(dragObject());
}

• Pasting of MIME data

void MyTable::paste()
{
    QMimeSource *source = QApplication::clipboard()->data();
    if (CellDrag::canDecode(source)) {
    QString str;
    CellDrag::decode(source, str);
    performPaste(str);
    }
}

Screenshots