view src/historywidget.cpp @ 571:012ba1b83328

Show cancel button with progress bar only when running an operation that it makes sense to cancel (we don't really want people cancelling e.g. initial folder scan because it would leave things in an inconsistent state)

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

/*
    EasyMercurial

    Based on HgExplorer by Jari Korhonen
    Copyright (c) 2010 Jari Korhonen
    Copyright (c) 2012 Chris Cannam
    Copyright (c) 2012 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.
*/

#include "historywidget.h"

#include "changesetscene.h"
#include "changesetview.h"
#include "panner.h"
#include "grapher.h"
#include "debug.h"
#include "uncommitteditem.h"
#include "findwidget.h"

#include <iostream>

#include <QGridLayout>
#include <QSettings>

HistoryWidget::HistoryWidget() :
    m_showUncommitted(false),
    m_refreshNeeded(false)
{
    m_panned = new ChangesetView;
    m_panner = new Panner;

    m_panned->setDragMode(QGraphicsView::ScrollHandDrag);
    m_panned->setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
    m_panned->setCacheMode(QGraphicsView::CacheNone);

    int row = 0;

    QGridLayout *layout = new QGridLayout;
    layout->setMargin(10);
    layout->addWidget(m_panned, row, 0);
    layout->addWidget(m_panner, row, 1);
    m_panner->setMaximumWidth(80);
    m_panner->connectToPanned(m_panned);

    layout->setRowStretch(row, 20);

    QSettings settings;
    settings.beginGroup("Presentation");
    bool showClosed = (settings.value("showclosedbranches", false).toBool());

    QWidget *opts = new QWidget;
    QGridLayout *optLayout = new QGridLayout(opts);
    optLayout->setMargin(0);
    layout->addWidget(opts, ++row, 0, 1, 2);

    m_findWidget = new FindWidget(this);
    optLayout->addWidget(m_findWidget, 0, 0, Qt::AlignLeft);
    connect(m_findWidget, SIGNAL(findTextChanged(QString)),
            this, SLOT(setSearchText(QString)));

    m_showClosedBranches = new QCheckBox(tr("Show closed branches"), this);
    m_showClosedBranches->setChecked(showClosed);
    connect(m_showClosedBranches, SIGNAL(toggled(bool)), 
            this, SLOT(showClosedChanged(bool)));
    optLayout->addWidget(m_showClosedBranches, 0, 1, Qt::AlignRight);
    m_showClosedBranches->hide();

    setLayout(layout);
}

HistoryWidget::~HistoryWidget()
{
    clearChangesets();
}

QGraphicsScene *HistoryWidget::scene()
{
    return m_panned->scene();
}

void HistoryWidget::clearChangesets()
{
    foreach (Changeset *cs, m_changesets) delete cs;
    m_changesets.clear();
}

void HistoryWidget::setCurrent(QStringList ids, QString branch,
                               bool showUncommitted)
{
    if (m_currentIds == ids &&
        m_currentBranch == branch &&
        m_showUncommitted == showUncommitted) return;

    DEBUG << "HistoryWidget::setCurrent: " << ids.size() << " ids, "
          << "showUncommitted: " << showUncommitted << endl;

    m_currentIds.clear();
    m_currentBranch = branch;
    m_showUncommitted = showUncommitted;

    if (ids.empty()) return;

    foreach (QString id, ids) {
        m_currentIds.push_back(id);
    }

    m_refreshNeeded = true;
}

void HistoryWidget::setClosedHeadIds(QSet<QString> closed)
{
    if (closed == m_closedIds) return;
    m_closedIds = closed;
    m_showClosedBranches->setVisible(!closed.empty());
    m_refreshNeeded = true;
}

void HistoryWidget::setShowUncommitted(bool showUncommitted)
{
    setCurrent(m_currentIds, m_currentBranch, showUncommitted);
}

void HistoryWidget::showClosedChanged(bool show)
{
    QSettings settings;
    settings.beginGroup("Presentation");
    settings.setValue("showclosedbranches", show);
    layoutAll();
}
    
void HistoryWidget::parseNewLog(QString log)
{
    DEBUG << "HistoryWidget::parseNewLog: log has " << log.length() << " chars" << endl;
    Changesets csets = Changeset::parseChangesets(log);
    DEBUG << "HistoryWidget::parseNewLog: log has " << csets.size() << " changesets" << endl;
    replaceChangesets(csets);
    m_refreshNeeded = true;
}
    
void HistoryWidget::parseIncrementalLog(QString log)
{
    DEBUG << "HistoryWidget::parseIncrementalLog: log has " << log.length() << " chars" << endl;
    Changesets csets = Changeset::parseChangesets(log);
    DEBUG << "HistoryWidget::parseIncrementalLog: log has " << csets.size() << " changesets" << endl;
    if (!csets.empty()) {
        addChangesets(csets);
    }
    m_refreshNeeded = true;
}

void HistoryWidget::replaceChangesets(Changesets csets)
{
    QSet<QString> oldIds;
    foreach (Changeset *cs, m_changesets) {
        oldIds.insert(cs->id());
    }

    QSet<QString> newIds;
    foreach (Changeset *cs, csets) {
        if (!oldIds.contains(cs->id())) {
            newIds.insert(cs->id());
        }
    }

    if (newIds.size() == csets.size()) {
        // completely new set, unrelated to the old: don't mark new
        m_newIds.clear();
    } else {
        m_newIds = newIds;
    }

    clearChangesets();
    m_changesets = csets;
}

void HistoryWidget::addChangesets(Changesets csets)
{
    m_newIds.clear();

    if (csets.empty()) return;

    foreach (Changeset *cs, csets) {
        m_newIds.insert(cs->id());
    }

    DEBUG << "addChangesets: " << csets.size() << " new changesets have ("
          << m_changesets.size() << " already)" << endl;

    csets << m_changesets;
    m_changesets = csets;
}

void HistoryWidget::update()
{
    if (m_refreshNeeded) {
        layoutAll();
    }
}

void HistoryWidget::layoutAll()
{
    m_refreshNeeded = false;

    setChangesetParents();

    ChangesetScene *scene = new ChangesetScene();
    ChangesetItem *tipItem = 0;

    QGraphicsScene *oldScene = m_panned->scene();

    m_panned->setScene(0);
    m_panner->setScene(0);

    delete oldScene;

    QGraphicsItem *toFocus = 0;

    if (!m_changesets.empty()) {
	Grapher g(scene);
        g.setClosedHeadIds(m_closedIds);
	try {
	    g.layout(m_changesets,
                     m_showUncommitted ? m_currentIds : QStringList(),
                     m_currentBranch);
	} catch (std::string s) {
	    std::cerr << "Internal error: Layout failed: " << s << std::endl;
	}
        toFocus = g.getUncommittedItem();
        if (!toFocus) {
            if (!m_currentIds.empty()) {
                toFocus = g.getItemFor(m_currentIds[0]);
            } else {
                toFocus = g.getItemFor(m_changesets[0]);
            }
        }
    }

    m_panned->setScene(scene);
    m_panner->setScene(scene);

    updateNewAndCurrentItems();

    if (toFocus) {
        toFocus->ensureVisible();
    }

    updateSearchStatus();
    connectSceneSignals();
}

void HistoryWidget::setChangesetParents()
{
    for (int i = 0; i < m_changesets.size(); ++i) {
        Changeset *cs = m_changesets[i];
        // Need to reset this, as Grapher::layout will recalculate it
        // and we don't want to end up with twice the children for
        // each parent...
        cs->setChildren(QStringList());
    }
    for (int i = 0; i+1 < m_changesets.size(); ++i) {
        Changeset *cs = m_changesets[i];
        if (cs->parents().empty()) {
            QStringList list;
            list.push_back(m_changesets[i+1]->id());
            cs->setParents(list);
        }
    }
}

void HistoryWidget::updateNewAndCurrentItems()
{
    QGraphicsScene *scene = m_panned->scene();
    if (!scene) return;

    QList<QGraphicsItem *> items = scene->items();
    foreach (QGraphicsItem *it, items) {

        ChangesetItem *csit = dynamic_cast<ChangesetItem *>(it);
        if (!csit) continue;

        QString id = csit->getChangeset()->id();

        bool current = m_currentIds.contains(id);
        if (current) {
            DEBUG << "id " << id << " is current" << endl;
        }
        bool newid = m_newIds.contains(id);
        if (newid) {
            DEBUG << "id " << id << " is new" << endl;
        }

        if (csit->isCurrent() != current ||
            csit->isNew() != newid) {
            csit->setCurrent(current);
            csit->setNew(newid);
            csit->update();
        }
    }
}

void HistoryWidget::setSearchText(QString text)
{
    if (m_searchText == text) return;
    m_searchText = text;
    updateSearchStatus();
}

void HistoryWidget::updateSearchStatus()
{
    QGraphicsScene *scene = m_panned->scene();
    if (!scene) return;

    ChangesetItem *toFocus = 0;

    QList<QGraphicsItem *> items = scene->items();
    foreach (QGraphicsItem *it, items) {

        ChangesetItem *csit = dynamic_cast<ChangesetItem *>(it);
        if (!csit) continue;
        
        bool matched = csit->matchSearchText(m_searchText);
        if (matched && (!toFocus || csit->row() < toFocus->row())) {
            toFocus = csit;
        }
        csit->update();
    }

    if (toFocus) {
        toFocus->ensureVisible();
    }
}

void HistoryWidget::connectSceneSignals()
{
    ChangesetScene *scene = qobject_cast<ChangesetScene *>(m_panned->scene());
    if (!scene) return;
    
    connect(scene, SIGNAL(commit()),
            this, SIGNAL(commit()));
    
    connect(scene, SIGNAL(revert()),
            this, SIGNAL(revert()));
    
    connect(scene, SIGNAL(diffWorkingFolder()),
            this, SIGNAL(diffWorkingFolder()));

    connect(scene, SIGNAL(showSummary()),
            this, SIGNAL(showSummary()));

    connect(scene, SIGNAL(showWork()),
            this, SIGNAL(showWork()));

    connect(scene, SIGNAL(newBranch()),
            this, SIGNAL(newBranch()));

    connect(scene, SIGNAL(noBranch()),
            this, SIGNAL(noBranch()));
    
    connect(scene, SIGNAL(updateTo(QString)),
            this, SIGNAL(updateTo(QString)));

    connect(scene, SIGNAL(diffToCurrent(QString)),
            this, SIGNAL(diffToCurrent(QString)));

    connect(scene, SIGNAL(diffToParent(QString, QString)),
            this, SIGNAL(diffToParent(QString, QString)));

    connect(scene, SIGNAL(showSummary(Changeset *)),
            this, SIGNAL(showSummary(Changeset *)));

    connect(scene, SIGNAL(mergeFrom(QString)),
            this, SIGNAL(mergeFrom(QString)));

    connect(scene, SIGNAL(newBranch(QString)),
            this, SIGNAL(newBranch(QString)));

    connect(scene, SIGNAL(closeBranch(QString)),
            this, SIGNAL(closeBranch(QString)));

    connect(scene, SIGNAL(tag(QString)),
            this, SIGNAL(tag(QString)));
}