Renderer pattern : QPainter « Qt « C++

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2. Qt
3. QPainter

Renderer pattern

  
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#ifndef CLIPWINDOW_H
#define CLIPWINDOW_H

#include <QMainWindow>

class QClipboard;
class QComboBox;
class QLabel;
class QListWidget;
class QMimeData;
class QWidget;

class ClipWindow : public QMainWindow
{
    Q_OBJECT

public:
    ClipWindow(QWidget *parent = 0);

public slots:
    void updateClipboard();
    void updateData(const QString &format);

private:
    int currentItem;
    QClipboard *clipboard;
    QComboBox *mimeTypeCombo;
    QLabel *dataInfoLabel;
    QListWidget *previousItems;
};

#endif












#include <QtGui>

#include "clipwindow.h"

ClipWindow::ClipWindow(QWidget *parent)
    : QMainWindow(parent)
{
    clipboard = QApplication::clipboard();

    QWidget *centralWidget = new QWidget(this);
    QWidget *currentItem = new QWidget(centralWidget);
    QLabel *mimeTypeLabel = new QLabel(tr("MIME types:"), currentItem);
    mimeTypeCombo = new QComboBox(currentItem);
    QLabel *dataLabel = new QLabel(tr("Data:"), currentItem);
    dataInfoLabel = new QLabel("", currentItem);

    previousItems = new QListWidget(centralWidget);

    connect(clipboard, SIGNAL(dataChanged()), this, SLOT(updateClipboard()));

    connect(mimeTypeCombo, SIGNAL(activated(const QString &)),
            this, SLOT(updateData(const QString &)));

    QVBoxLayout *currentLayout = new QVBoxLayout(currentItem);
    currentLayout->addWidget(mimeTypeLabel);
    currentLayout->addWidget(mimeTypeCombo);
    currentLayout->addWidget(dataLabel);
    currentLayout->addWidget(dataInfoLabel);
    currentLayout->addStretch(1);

    QHBoxLayout *mainLayout = new QHBoxLayout(centralWidget);
    mainLayout->addWidget(currentItem, 1);
    mainLayout->addWidget(previousItems);

    setCentralWidget(centralWidget);
    setWindowTitle(tr("Clipboard"));
}


void ClipWindow::updateClipboard()
{
    QStringList formats = clipboard->mimeData()->formats();
    QByteArray data = clipboard->mimeData()->data(format);


    mimeTypeCombo->clear();
    mimeTypeCombo->insertStringList(formats);

    int size = clipboard->mimeData()->data(formats[0]).size();
    QListWidgetItem *newItem = new QListWidgetItem(previousItems);
    newItem->setText(tr("%1 (%2 bytes)").arg(formats[0]).arg(size));

    updateData(formats[0]);

}


void ClipWindow::updateData(const QString &format)
{
    QByteArray data = clipboard->mimeData()->data(format);
    dataInfoLabel->setText(tr("%1 bytes").arg(data.size()));
}









#include <QApplication>

#include "clipwindow.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    ClipWindow *window = new ClipWindow;
    window->resize(640, 480);
    window->show();
    return app.exec();
}

   
    
  

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