annotate data/model/TextModel.h @ 1752:6d09d68165a4 by-id

Further review of ById: make IDs only available when adding a model to the ById store, not by querying the item directly. This means any id encountered in the wild must have been added to the store at some point (even if later released), which simplifies reasoning about lifecycles

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef SV_TEXT_MODEL_H
#define SV_TEXT_MODEL_H

#include "EventCommands.h"
#include "TabularModel.h"
#include "Model.h"
#include "DeferredNotifier.h"

#include "base/EventSeries.h"
#include "base/XmlExportable.h"
#include "base/RealTime.h"

#include "system/System.h"

#include <QStringList>

/**
 * A model representing casual textual annotations. A piece of text
 * has a given time and y-value in the [0,1) range (indicative of
 * height on the window).
 */
class TextModel : public Model,
                  public TabularModel,
                  public EventEditable
{
    Q_OBJECT
    
public:
    TextModel(sv_samplerate_t sampleRate,
              int resolution,
              bool notifyOnAdd = true) :
        m_sampleRate(sampleRate),
        m_resolution(resolution),
        m_notifier(this,
                   getId(),
                   notifyOnAdd ?
                   DeferredNotifier::NOTIFY_ALWAYS :
                   DeferredNotifier::NOTIFY_DEFERRED),
        m_completion(100) {
    }

    QString getTypeName() const override { return tr("Text"); }
    bool isSparse() const override { return true; }
    bool isOK() const override { return true; }

    sv_frame_t getStartFrame() const override {
        return m_events.getStartFrame();
    }
    sv_frame_t getTrueEndFrame() const override {
        if (m_events.isEmpty()) return 0;
        sv_frame_t e = m_events.getEndFrame() + 1;
        if (e % m_resolution == 0) return e;
        else return (e / m_resolution + 1) * m_resolution;
    }
    
    sv_samplerate_t getSampleRate() const override { return m_sampleRate; }
    int getResolution() const { return m_resolution; }
    
    int getCompletion() const override { return m_completion; }

    void setCompletion(int completion, bool update = true) {
        
        {   QMutexLocker locker(&m_mutex);
            if (m_completion == completion) return;
            m_completion = completion;
        }

        if (update) {
            m_notifier.makeDeferredNotifications();
        }
        
        emit completionChanged(getId());

        if (completion == 100) {
            // henceforth:
            m_notifier.switchMode(DeferredNotifier::NOTIFY_ALWAYS);
            emit modelChanged(getId());
        }
    }
    
    /**
     * Query methods.
     */

    int getEventCount() const {
        return m_events.count();
    }
    bool isEmpty() const {
        return m_events.isEmpty();
    }
    bool containsEvent(const Event &e) const {
        return m_events.contains(e);
    }
    EventVector getAllEvents() const {
        return m_events.getAllEvents();
    }
    EventVector getEventsSpanning(sv_frame_t f, sv_frame_t duration) const {
        return m_events.getEventsSpanning(f, duration);
    }
    EventVector getEventsCovering(sv_frame_t f) const {
        return m_events.getEventsCovering(f);
    }
    EventVector getEventsWithin(sv_frame_t f, sv_frame_t duration,
                                int overspill = 0) const {
        return m_events.getEventsWithin(f, duration, overspill);
    }
    EventVector getEventsStartingWithin(sv_frame_t f, sv_frame_t duration) const {
        return m_events.getEventsStartingWithin(f, duration);
    }
    EventVector getEventsStartingAt(sv_frame_t f) const {
        return m_events.getEventsStartingAt(f);
    }
    bool getNearestEventMatching(sv_frame_t startSearchAt,
                                 std::function<bool(Event)> predicate,
                                 EventSeries::Direction direction,
                                 Event &found) const {
        return m_events.getNearestEventMatching
            (startSearchAt, predicate, direction, found);
    }

    /**
     * Editing methods.
     */
    void add(Event e) override {

        {   QMutexLocker locker(&m_mutex);
            m_events.add(e.withoutDuration().withoutLevel());
        }
        
        m_notifier.update(e.getFrame(), m_resolution);
    }
    
    void remove(Event e) override {
        {   QMutexLocker locker(&m_mutex);
            m_events.remove(e);
        }
        emit modelChangedWithin(getId(),
                                e.getFrame(), e.getFrame() + m_resolution);
    }

    /**
     * TabularModel methods.  
     */
    
    int getRowCount() const override {
        return m_events.count();
    }

    int getColumnCount() const override {
        return 4;
    }

    bool isColumnTimeValue(int column) const override {
        return (column < 2);
    }

    sv_frame_t getFrameForRow(int row) const override {
        if (row < 0 || row >= m_events.count()) {
            return 0;
        }
        Event e = m_events.getEventByIndex(row);
        return e.getFrame();
    }

    int getRowForFrame(sv_frame_t frame) const override {
        return m_events.getIndexForEvent(Event(frame));
    }
    
    QString getHeading(int column) const override {
        switch (column) {
        case 0: return tr("Time");
        case 1: return tr("Frame");
        case 2: return tr("Height");
        case 3: return tr("Label");
        default: return tr("Unknown");
        }
    }

    SortType getSortType(int column) const override {
        if (column == 3) return SortAlphabetical;
        return SortNumeric;
    }

    QVariant getData(int row, int column, int role) const override {
        
        if (row < 0 || row >= m_events.count()) {
            return QVariant();
        }

        Event e = m_events.getEventByIndex(row);

        switch (column) {
        case 0: return adaptFrameForRole(e.getFrame(), getSampleRate(), role);
        case 1: return int(e.getFrame());
        case 2: return e.getValue();
        case 3: return e.getLabel();
        default: return QVariant();
        }
    }

    Command *getSetDataCommand(int row, int column, const QVariant &value, int role) override {
        
        if (row < 0 || row >= m_events.count()) return nullptr;
        if (role != Qt::EditRole) return nullptr;

        Event e0 = m_events.getEventByIndex(row);
        Event e1;

        switch (column) {
        case 0: e1 = e0.withFrame(sv_frame_t(round(value.toDouble() *
                                                   getSampleRate()))); break;
        case 1: e1 = e0.withFrame(value.toInt()); break;
        case 2: e1 = e0.withValue(float(value.toDouble())); break;
        case 3: e1 = e0.withLabel(value.toString()); break;
        }

        auto command = new ChangeEventsCommand(getId().untyped, tr("Edit Data"));
        command->remove(e0);
        command->add(e1);
        return command->finish();
    }
    
    /**
     * XmlExportable methods.
     */
    void toXml(QTextStream &out,
               QString indent = "",
               QString extraAttributes = "") const override {

        Model::toXml
            (out,
             indent,
             QString("type=\"sparse\" dimensions=\"2\" resolution=\"%1\" "
                     "notifyOnAdd=\"%2\" dataset=\"%3\" subtype=\"text\" %4")
             .arg(m_resolution)
             .arg("true") // always true after model reaches 100% -
                          // subsequent events are always notified
             .arg(m_events.getExportId())
             .arg(extraAttributes));

        Event::ExportNameOptions options;
        options.valueAtttributeName = "height";
        
        m_events.toXml(out, indent, QString("dimensions=\"2\""), options);
    }

    QString toDelimitedDataString(QString delimiter,
                                  DataExportOptions options,
                                  sv_frame_t startFrame,
                                  sv_frame_t duration) const override {
        return m_events.toDelimitedDataString(delimiter,
                                              options,
                                              startFrame,
                                              duration,
                                              m_sampleRate,
                                              m_resolution,
                                              Event().withValue(0.f));
    }
  
protected:
    sv_samplerate_t m_sampleRate;
    int m_resolution;

    DeferredNotifier m_notifier;
    int m_completion;

    EventSeries m_events;

    mutable QMutex m_mutex;  

};


#endif