iconpreviewarea.cpp Example File | Qt Widgets 5.12.10

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- iconpreviewarea.cpp Example File
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# iconpreviewarea.cpp Example File

widgets/icons/iconpreviewarea.cpp

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     #include <QtWidgets>

     #include "iconpreviewarea.h"

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

         for (int row = 0; row < NumStates; ++row) {
             stateLabels[row] = createHeaderLabel(IconPreviewArea::iconStateNames().at(row));
             mainLayout->addWidget(stateLabels[row], row + 1, 0);
         }
         Q_ASSERT(NumStates == 2);

         for (int column = 0; column < NumModes; ++column) {
             modeLabels[column] = createHeaderLabel(IconPreviewArea::iconModeNames().at(column));
             mainLayout->addWidget(modeLabels[column], 0, column + 1);
         }
         Q_ASSERT(NumModes == 4);

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

     #ifdef Q_COMPILER_INITIALIZER_LISTS

     QVector<QIcon::Mode> IconPreviewArea::iconModes()
     {
         static const QVector<QIcon::Mode> result = {QIcon::Normal, QIcon::Active, QIcon::Disabled, QIcon::Selected};
         return result;
     }

     QVector<QIcon::State> IconPreviewArea::iconStates()
     {
         static const QVector<QIcon::State> result = {QIcon::Off, QIcon::On};
         return result;
     }

     QStringList IconPreviewArea::iconModeNames()
     {
         static const QStringList result = {tr("Normal"), tr("Active"), tr("Disabled"), tr("Selected")};
         return result;
     }

     QStringList IconPreviewArea::iconStateNames()
     {
         static const QStringList result = {tr("Off"), tr("On")};
         return result;
     }

     #else // Q_COMPILER_INITIALIZER_LISTS

     QVector<QIcon::Mode> IconPreviewArea::iconModes()
     {
         static QVector<QIcon::Mode> result;
         if (result.isEmpty())
             result << QIcon::Normal << QIcon::Active << QIcon::Disabled << QIcon::Selected;
         return result;
     }

     QVector<QIcon::State> IconPreviewArea::iconStates()
     {
         static QVector<QIcon::State> result;
         if (result.isEmpty())
             result << QIcon::Off << QIcon::On;
         return result;
     }

     QStringList IconPreviewArea::iconModeNames()
     {
         static QStringList result;
         if (result.isEmpty())
             result << tr("Normal") << tr("Active") << tr("Disabled") << tr("Selected");
         return result;
     }

     QStringList IconPreviewArea::iconStateNames()
     {
         static QStringList result;
         if (result.isEmpty())
             result << tr("Off") << tr("On");
         return result;
     }

     #endif // !Q_COMPILER_INITIALIZER_LISTS

     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()
     {
         QWindow *window = nullptr;
         if (const QWidget *nativeParent = nativeParentWidget())
             window = nativeParent->windowHandle();
         for (int column = 0; column < NumModes; ++column) {
             for (int row = 0; row < NumStates; ++row) {
                 const QPixmap pixmap =
                     icon.pixmap(window, size, IconPreviewArea::iconModes().at(column),
                                 IconPreviewArea::iconStates().at(row));
                 QLabel *pixmapLabel = pixmapLabels[column][row];
                 pixmapLabel->setPixmap(pixmap);
                 pixmapLabel->setEnabled(!pixmap.isNull());
                 QString toolTip;
                 if (!pixmap.isNull()) {
                     const QSize actualSize = icon.actualSize(size);
                     toolTip =
                         tr("Size: %1x%2\nActual size: %3x%4\nDevice pixel ratio: %5")
                             .arg(size.width()).arg(size.height())
                             .arg(actualSize.width()).arg(actualSize.height())
                             .arg(pixmap.devicePixelRatioF());
                 }
                 pixmapLabel->setToolTip(toolTip);
             }
         }
     }