text: /******************************************************************************
   * The MIT License (MIT)
   *
   * Copyright (c) 2019-2021 Baldur Karlsson
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   ******************************************************************************/
  
  #pragma once
  
  #include <QFrame>
  
  class PipelineFlowChart : public QFrame
  {
    Q_OBJECT
  
  public:
    explicit PipelineFlowChart(QWidget *parent = 0);
    ~PipelineFlowChart();
  
    const QStringList &stageAbbreviations() { return m_StageAbbrevs; }
    const QStringList &stageNames() { return m_StageNames; }
    void setStages(const QStringList &abbrevs, const QStringList &names);
    void setStageName(int index, const QString &abbrev, const QString &name);
    void setIsolatedStage(int index);
  
    void setStagesEnabled(const QList<bool> &enabled);
  
    void setSelectedStage(int idx);
    int selectedStage();
  
    QSize minimumSizeHint() const override;
    QSize sizeHint() const override;
  
  signals:
    void stageSelected(int idx);
  
  private:
    void paintEvent(QPaintEvent *e) override;
    void mouseMoveEvent(QMouseEvent *e) override;
    void mousePressEvent(QMouseEvent *e) override;
    void leaveEvent(QEvent *e) override;
    void focusOutEvent(QFocusEvent *event) override;
  
    QList<bool> m_StagesEnabled;
    QList<bool> m_StageFlows;
    QStringList m_StageAbbrevs;
    QStringList m_StageNames;
  
    int m_HoverStage = -1;
    int m_SelectedStage = 0;
  
    bool stageEnabled(int index);
  
    const qreal BoxBorderWidth = 2.5;
    const qreal MinBoxDimension = 25.0;
    const qreal MaxBoxCornerRadius = 20.0;
    const qreal BoxCornerRadiusFraction = 1.0 / 6.0;
    const qreal ArrowHeadSize = 6.0;
    const qreal MinBoxMargin = 4.0;
    const qreal BoxLabelMargin = 8.0;
    const qreal BoxMarginFraction = 0.02;
  
    int numGaps();
    int numItems();
  
    QRectF totalAreaRect();
    qreal boxMargin();
    QRectF boxRect(int i);
  
    void drawArrow(QPainter &p, const QPen &pen, float headsize, float y, float left, float right);
  };
  