BuddyLabel.h

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/*
  BuddyLabel
  https://github.com/mpaperno/maxLibQt

  COPYRIGHT: (c)2019 Maxim Paperno; All Right Reserved.
  Contact: http://www.WorldDesign.com/contact

  LICENSE:

  Commercial License Usage
  Licensees holding valid commercial licenses may use this file in
  accordance with the terms contained in a written agreement between
  you and the copyright holder.

  GNU General Public License Usage
  Alternatively, this file may be used under the terms of the GNU
  General Public License as published by the Free Software Foundation,
  either version 3 of the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  A copy of the GNU General Public License is available at <http://www.gnu.org/licenses/>.
*/

#ifndef BUDDYLABEL_H
#define BUDDYLABEL_H

#include <QLabel>
#include <QAbstractSpinBox>
#include <QCheckBox>
#include <QComboBox>
#include <QMouseEvent>
#include <QLineEdit>

class BuddyLabel : public QLabel
{
    Q_OBJECT
  public:
    using QLabel::QLabel;

  public slots:
    void setBuddy(QWidget *buddy)
    {
      if (this->buddy()) {
        this->buddy()->removeEventFilter(this);
        disconnect(this->buddy());
        disconnectBuddy(this->buddy());
      }

      QLabel::setBuddy(buddy);

      if (!buddy)
        return;

      setToolTip(buddy->toolTip());
      buddy->installEventFilter(this);
      connectBuddy(buddy);
    }

  signals:
    void clicked();
    void doubleClicked();

  protected:
    virtual void connectBuddy(QWidget *buddy)
    {
      // Single clicks
      connect(this, &BuddyLabel::clicked, buddy, QOverload<>::of(&QWidget::setFocus));
      if (QCheckBox *cb = qobject_cast<QCheckBox*>(buddy))
        connect(this, &BuddyLabel::clicked, cb, &QCheckBox::click);

      // Double clicks
      if (QLineEdit *le = qobject_cast<QLineEdit*>(buddy))
        connect(this, &BuddyLabel::doubleClicked, le, &QLineEdit::selectAll);
      else if (QAbstractSpinBox *sb = qobject_cast<QAbstractSpinBox*>(buddy))
        connect(this, &BuddyLabel::doubleClicked, sb, &QAbstractSpinBox::selectAll);
      else if (QComboBox *cb = qobject_cast<QComboBox*>(buddy))
        if (cb->isEditable() && cb->lineEdit())
          connect(this, &BuddyLabel::doubleClicked, cb->lineEdit(), &QLineEdit::selectAll);
    }

    virtual void disconnectBuddy(QWidget *buddy) { Q_UNUSED(buddy) }

    bool eventFilter(QObject *obj, QEvent *ev)
    {
      if (ev->type() == QEvent::ToolTipChange && buddy() && obj == buddy())
        setToolTip(buddy()->toolTip());
      return false;
    }

    void mousePressEvent(QMouseEvent *ev)
    {
      if (ev->button() == Qt::LeftButton) {
        m_pressed = true;
        ev->accept();
      }
      QLabel::mousePressEvent(ev);
    }

    void mouseReleaseEvent(QMouseEvent *ev)
    {
      if (m_pressed && rect().contains(ev->pos()))
        emit clicked();
      m_pressed = false;
      QLabel::mouseReleaseEvent(ev);
    }

    void mouseDoubleClickEvent(QMouseEvent *ev)
    {
      if (ev->button() == Qt::LeftButton && rect().contains(ev->pos()))
        emit doubleClicked();
      QLabel::mouseDoubleClickEvent(ev);
    }

  private:
    bool m_pressed = false;
    Q_DISABLE_COPY(BuddyLabel)
};

#endif // BUDDYLABEL_H