Program Listing for File widgets.h

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#ifndef MAPVIZ__WIDGETS_H_
#define MAPVIZ__WIDGETS_H_

// QT libraries
#include <QWidget>
#include <QListWidget>
#include <QListWidgetItem>
#include <QLabel>
#include <QMouseEvent>
#include <QDropEvent>
#include <QPainter>
#include <QPixmap>

namespace mapviz
{
class PluginConfigList : public QListWidget
{
  Q_OBJECT

public:
  explicit PluginConfigList(QWidget *parent = nullptr) : QListWidget(parent) {}
  PluginConfigList() = default;

  void UpdateIndices()
  {
    for (int i = 0; i < count(); i++) {
      item(i)->setData(Qt::UserRole, QVariant((static_cast<float>(i))));
    }
  }

Q_SIGNALS:
  void ItemsMoved();

protected:
  void dropEvent(QDropEvent* event) override
  {
    QListWidget::dropEvent(event);

    UpdateIndices();

    Q_EMIT ItemsMoved();
  }
};

class PluginConfigListItem : public QListWidgetItem
{
public:
  explicit PluginConfigListItem(QListWidget *parent = nullptr) : QListWidgetItem(parent) {}

  bool operator< (const QListWidgetItem & other) const override
  {
    return data(Qt::UserRole).toFloat() < other.data(Qt::UserRole).toFloat();
  }
};

class SingleClickLabel : public QLabel
{
  Q_OBJECT

public:
  explicit SingleClickLabel(QWidget *parent = 0, Qt::WindowFlags flags = 0) :
    QLabel(parent, flags) {}

  ~SingleClickLabel() override = default;

Q_SIGNALS:
  void Clicked();

protected:
  void mousePressEvent(QMouseEvent*) override
  {
    Q_EMIT Clicked();
  }
};

class DoubleClickWidget : public QWidget
{
  Q_OBJECT

public:
  explicit DoubleClickWidget(QWidget *parent = 0, Qt::WindowFlags flags = 0) :
    QWidget(parent, flags) {}

  ~DoubleClickWidget() override = default;

Q_SIGNALS:
  void DoubleClicked();
  void RightClicked();

protected:
  void mouseDoubleClickEvent(QMouseEvent* event) override
  {
    if (event->button() == Qt::LeftButton) {
      Q_EMIT DoubleClicked();
    }
  }

  void mouseReleaseEvent(QMouseEvent* event) override
  {
    if (event->button() == Qt::RightButton) {
      Q_EMIT RightClicked();
    }
  }
};

class IconWidget : public QWidget
{
  Q_OBJECT

public:
  explicit IconWidget(QWidget *parent = nullptr, Qt::WindowFlags flags = nullptr) :
    QWidget(parent, flags)
  {
    pixmap_ = QPixmap(16, 16);
    pixmap_.fill(Qt::transparent);
  }

  ~IconWidget() override = default;

  void SetPixmap(QPixmap pixmap)
  {
    pixmap_ = pixmap;
    update();
  }

protected:
  void paintEvent(QPaintEvent*) override
  {
    QPainter painter(this);
    painter.fillRect(0, 0, width(), height(), palette().color(QPalette::Button));

    int x_offset = (width() - pixmap_.width()) / 2;
    int y_offset = (height() - pixmap_.height()) / 2;

    painter.drawPixmap(x_offset, y_offset, pixmap_);
  }

  QPixmap pixmap_;
};
}   // namespace mapviz

#endif  // MAPVIZ__WIDGETS_H_