Qt 5.11 | Qt Widgets | Icons Example | iconpreviewarea.cpp Example File

Qt 5.11.3 Reference Documentation

# 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);
              }
          }
      }