mainwindow.cpp Example File

widgets/charactermap/mainwindow.cpp

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  ** Contact: http://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** You may use this file under the terms of the BSD license as follows:
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  #include <QtWidgets>

  #include "characterwidget.h"
  #include "mainwindow.h"

  MainWindow::MainWindow()
  {
      QWidget *centralWidget = new QWidget;

      QLabel *fontLabel = new QLabel(tr("Font:"));
      fontCombo = new QFontComboBox;
      QLabel *sizeLabel = new QLabel(tr("Size:"));
      sizeCombo = new QComboBox;
      QLabel *styleLabel = new QLabel(tr("Style:"));
      styleCombo = new QComboBox;
      QLabel *fontMergingLabel = new QLabel(tr("Automatic Font Merging:"));
      fontMerging = new QCheckBox;
      fontMerging->setChecked(true);

      scrollArea = new QScrollArea;
      characterWidget = new CharacterWidget;
      scrollArea->setWidget(characterWidget);

      findStyles(fontCombo->currentFont());
      findSizes(fontCombo->currentFont());

      lineEdit = new QLineEdit;
  #ifndef QT_NO_CLIPBOARD
      QPushButton *clipboardButton = new QPushButton(tr("&To clipboard"));

      clipboard = QApplication::clipboard();
  #endif

      connect(fontCombo, SIGNAL(currentFontChanged(QFont)),
              this, SLOT(findStyles(QFont)));
      connect(fontCombo, SIGNAL(currentFontChanged(QFont)),
              this, SLOT(findSizes(QFont)));
      connect(fontCombo, SIGNAL(currentFontChanged(QFont)),
              characterWidget, SLOT(updateFont(QFont)));
      connect(sizeCombo, SIGNAL(currentIndexChanged(QString)),
              characterWidget, SLOT(updateSize(QString)));
      connect(styleCombo, SIGNAL(currentIndexChanged(QString)),
              characterWidget, SLOT(updateStyle(QString)));
      connect(characterWidget, SIGNAL(characterSelected(QString)),
              this, SLOT(insertCharacter(QString)));

  #ifndef QT_NO_CLIPBOARD
      connect(clipboardButton, SIGNAL(clicked()), this, SLOT(updateClipboard()));
  #endif
      connect(fontMerging, SIGNAL(toggled(bool)), characterWidget, SLOT(updateFontMerging(bool)));

      QHBoxLayout *controlsLayout = new QHBoxLayout;
      controlsLayout->addWidget(fontLabel);
      controlsLayout->addWidget(fontCombo, 1);
      controlsLayout->addWidget(sizeLabel);
      controlsLayout->addWidget(sizeCombo, 1);
      controlsLayout->addWidget(styleLabel);
      controlsLayout->addWidget(styleCombo, 1);
      controlsLayout->addWidget(fontMergingLabel);
      controlsLayout->addWidget(fontMerging, 1);
      controlsLayout->addStretch(1);

      QHBoxLayout *lineLayout = new QHBoxLayout;
      lineLayout->addWidget(lineEdit, 1);
      lineLayout->addSpacing(12);
  #ifndef QT_NO_CLIPBOARD
      lineLayout->addWidget(clipboardButton);
  #endif

      QVBoxLayout *centralLayout = new QVBoxLayout;
      centralLayout->addLayout(controlsLayout);
      centralLayout->addWidget(scrollArea, 1);
      centralLayout->addSpacing(4);
      centralLayout->addLayout(lineLayout);
      centralWidget->setLayout(centralLayout);

      setCentralWidget(centralWidget);
      setWindowTitle(tr("Character Map"));
  }

  void MainWindow::findStyles(const QFont &font)
  {
      QFontDatabase fontDatabase;
      QString currentItem = styleCombo->currentText();
      styleCombo->clear();

      QString style;
      foreach (style, fontDatabase.styles(font.family()))
          styleCombo->addItem(style);

      int styleIndex = styleCombo->findText(currentItem);

      if (styleIndex == -1)
          styleCombo->setCurrentIndex(0);
      else
          styleCombo->setCurrentIndex(styleIndex);
  }

  void MainWindow::findSizes(const QFont &font)
  {
      QFontDatabase fontDatabase;
      QString currentSize = sizeCombo->currentText();
      sizeCombo->blockSignals(true);
      sizeCombo->clear();

      int size;
      if(fontDatabase.isSmoothlyScalable(font.family(), fontDatabase.styleString(font))) {
          foreach(size, QFontDatabase::standardSizes()) {
              sizeCombo->addItem(QVariant(size).toString());
              sizeCombo->setEditable(true);
          }

      } else {
          foreach(size, fontDatabase.smoothSizes(font.family(), fontDatabase.styleString(font))) {
              sizeCombo->addItem(QVariant(size).toString());
              sizeCombo->setEditable(false);
          }
      }

      sizeCombo->blockSignals(false);

      int sizeIndex = sizeCombo->findText(currentSize);

      if(sizeIndex == -1)
          sizeCombo->setCurrentIndex(qMax(0, sizeCombo->count() / 3));
      else
          sizeCombo->setCurrentIndex(sizeIndex);
  }

  void MainWindow::insertCharacter(const QString &character)
  {
      lineEdit->insert(character);
  }

  #ifndef QT_NO_CLIPBOARD
  void MainWindow::updateClipboard()
  {
      clipboard->setText(lineEdit->text(), QClipboard::Clipboard);
      clipboard->setText(lineEdit->text(), QClipboard::Selection);
  }
  #endif