textartdialog.cpp

Qt4的一些例子

#include <QtGui>

#include "textartdialog.h"
#include "textartinterface.h"

TextArtDialog::TextArtDialog(const QString &text, QWidget *parent)
    : QDialog(parent)
{
    listWidget = new QListWidget;
    listWidget->setViewMode(QListWidget::IconMode);
    listWidget->setMovement(QListWidget::Static);
    listWidget->setIconSize(QSize(260, 80));

    QPushButton *okButton = new QPushButton(tr("OK"));
    okButton->setDefault(true);

    QPushButton *cancelButton = new QPushButton(tr("Cancel"));

    connect(okButton, SIGNAL(clicked()), this, SLOT(accept()));
    connect(cancelButton, SIGNAL(clicked()), this, SLOT(reject()));

    QHBoxLayout *buttonLayout = new QHBoxLayout;
    buttonLayout->addStretch();
    buttonLayout->addWidget(okButton);
    buttonLayout->addWidget(cancelButton);

    QVBoxLayout *mainLayout = new QVBoxLayout;
    mainLayout->addWidget(listWidget);
    mainLayout->addLayout(buttonLayout);
    setLayout(mainLayout);

    loadPlugins();
    populateListWidget(text);

    setWindowTitle(tr("Text Art"));
}

QPixmap TextArtDialog::selectedPixmap() const
{
    if (!listWidget->currentItem())
        return QPixmap();

    return qvariant_cast<QPixmap>(
                listWidget->currentItem()->data(Qt::DecorationRole));
}

void TextArtDialog::loadPlugins()
{
    QDir pluginDir(QApplication::applicationDirPath());

#if defined(Q_OS_WIN)
    if (pluginDir.dirName().toLower() == "debug"
            || pluginDir.dirName().toLower() == "release")
        pluginDir.cdUp();
#elif defined(Q_OS_MAC)
    if (pluginDir.dirName() == "MacOS") {
        pluginDir.cdUp();
        pluginDir.cdUp();
        pluginDir.cdUp();
    }
#endif
    if (!pluginDir.cd("plugins"))
        return;

    foreach (QString fileName, pluginDir.entryList(QDir::Files)) {
        QPluginLoader loader(pluginDir.absoluteFilePath(fileName));
        if (TextArtInterface *interface =
                    qobject_cast<TextArtInterface *>(loader.instance()))
            interfaces.append(interface);
    }
}

void TextArtDialog::populateListWidget(const QString &text)
{
    QSize iconSize = listWidget->iconSize();
    QPen pen(QColor("darkseagreen"));

    QLinearGradient gradient(0, 0, iconSize.width() / 2,
                             iconSize.height() / 2);
    gradient.setColorAt(0.0, QColor("darkolivegreen"));
    gradient.setColorAt(0.8, QColor("darkgreen"));
    gradient.setColorAt(1.0, QColor("lightgreen"));

    QFont font("Helvetica", iconSize.height(), QFont::Bold);

    foreach (TextArtInterface *interface, interfaces) {
        foreach (QString effect, interface->effects()) {
            QListWidgetItem *item = new QListWidgetItem(effect,
                                                        listWidget);
            QPixmap pixmap = interface->applyEffect(effect, text, font,
                                                    iconSize, pen,
                                                    gradient);
            item->setData(Qt::DecorationRole, pixmap);
        }
    }
    listWidget->setCurrentRow(0);
}