iconpreviewarea.cpp Example File

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 #include <QtWidgets>

 #include "iconpreviewarea.h"

 IconPreviewArea::IconPreviewArea(QWidget *parent)
     : QWidget(parent)
 {
     QGridLayout *mainLayout = new QGridLayout;
     setLayout(mainLayout);

     stateLabels[0] = createHeaderLabel(tr("Off"));
     stateLabels[1] = createHeaderLabel(tr("On"));
     Q_ASSERT(NumStates == 2);

     modeLabels[0] = createHeaderLabel(tr("Normal"));
     modeLabels[1] = createHeaderLabel(tr("Active"));
     modeLabels[2] = createHeaderLabel(tr("Disabled"));
     modeLabels[3] = createHeaderLabel(tr("Selected"));
     Q_ASSERT(NumModes == 4);

     for (int j = 0; j < NumStates; ++j)
         mainLayout->addWidget(stateLabels[j], j + 1, 0);

     for (int i = 0; i < NumModes; ++i) {
         mainLayout->addWidget(modeLabels[i], 0, i + 1);

         for (int j = 0; j < NumStates; ++j) {
             pixmapLabels[i][j] = createPixmapLabel();
             mainLayout->addWidget(pixmapLabels[i][j], j + 1, i + 1);
         }
     }
 }

 void IconPreviewArea::setIcon(const QIcon &icon)
 {
     this->icon = icon;
     updatePixmapLabels();
 }

 void IconPreviewArea::setSize(const QSize &size)
 {
     if (size != this->size) {
         this->size = size;
         updatePixmapLabels();
     }
 }

 QLabel *IconPreviewArea::createHeaderLabel(const QString &text)
 {
     QLabel *label = new QLabel(tr("<b>%1</b>").arg(text));
     label->setAlignment(Qt::AlignCenter);
     return label;
 }

 QLabel *IconPreviewArea::createPixmapLabel()
 {
     QLabel *label = new QLabel;
     label->setEnabled(false);
     label->setAlignment(Qt::AlignCenter);
     label->setFrameShape(QFrame::Box);
     label->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
     label->setBackgroundRole(QPalette::Base);
     label->setAutoFillBackground(true);
     label->setMinimumSize(132, 132);
     return label;
 }

 void IconPreviewArea::updatePixmapLabels()
 {
     for (int i = 0; i < NumModes; ++i) {
         QIcon::Mode mode;
         if (i == 0) {
             mode = QIcon::Normal;
         } else if (i == 1) {
             mode = QIcon::Active;
         } else if (i == 2) {
             mode = QIcon::Disabled;
         } else {
             mode = QIcon::Selected;
         }

         for (int j = 0; j < NumStates; ++j) {
             QIcon::State state = (j == 0) ? QIcon::Off : QIcon::On;
             QPixmap pixmap = icon.pixmap(size, mode, state);
             pixmapLabels[i][j]->setPixmap(pixmap);
             pixmapLabels[i][j]->setEnabled(!pixmap.isNull());
         }
     }
 }