qt-creator/src/plugins/debugger/watchwindow.cpp

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**
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** Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
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** Public License versions 2.0 or 3.0 as published by the Free Software
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#include "watchwindow.h"

#include <QtCore/QDebug>
#include <QtCore/QTimer>

#include <QtGui/QAction>
#include <QtGui/QContextMenuEvent>
#include <QtGui/QHeaderView>
#include <QtGui/QLineEdit>
#include <QtGui/QMenu>
#include <QtGui/QResizeEvent>
#include <QtGui/QSplitter>

using namespace Debugger::Internal;

enum { INameRole = Qt::UserRole, VisualRole };

/////////////////////////////////////////////////////////////////////
//
// WatchWindow
//
/////////////////////////////////////////////////////////////////////

WatchWindow::WatchWindow(Type type, QWidget *parent)
  : QTreeView(parent), m_type(type)
{
    m_blocked = false;
    setWindowTitle(tr("Locals and Watchers"));
    setAlternatingRowColors(true);
    setIndentation(indentation() * 9/10);
    setUniformRowHeights(true);

    connect(itemDelegate(), SIGNAL(commitData(QWidget *)),
        this, SLOT(handleChangedItem(QWidget *)));
    connect(this, SIGNAL(expanded(QModelIndex)),
        this, SLOT(expandNode(QModelIndex)));
    connect(this, SIGNAL(collapsed(QModelIndex)),
        this, SLOT(collapseNode(QModelIndex)));
}

void WatchWindow::expandNode(const QModelIndex &idx)
{
    //QModelIndex mi0 = idx.sibling(idx.row(), 0);
    //QString iname = model()->data(mi0, INameRole).toString();
    //QString name = model()->data(mi0, Qt::DisplayRole).toString();
    //qDebug() << "\n\nEXPAND NODE " // << iname << name
    //    << idx << (m_blocked ? "blocked" : "passed");
    //if (isExpanded(idx))
    //    return;
    //if (m_blocked)
    //    return;
    emit requestExpandChildren(idx);
}

void WatchWindow::collapseNode(const QModelIndex &idx)
{
    //QModelIndex mi0 = idx.sibling(idx.row(), 0);
    //QString iname = model()->data(mi0, INameRole).toString();
    //QString name = model()->data(mi0, Qt::DisplayRole).toString();
    //qDebug() << "COLLAPSE NODE " << idx;
    if (m_blocked)
        return;
    emit requestCollapseChildren(idx);
}

void WatchWindow::contextMenuEvent(QContextMenuEvent *ev)
{
    QMenu menu;
    QAction *act1 = new QAction("Adjust column widths to contents", &menu);
    QAction *act2 = new QAction("Always adjust column widths to contents", &menu);
    act2->setCheckable(true);
    act2->setChecked(m_alwaysResizeColumnsToContents);

    menu.addAction(act1);
    menu.addAction(act2);

    QAction *act3 = 0;
    QAction *act4 = 0;
    QModelIndex idx = indexAt(ev->pos());
    QModelIndex mi0 = idx.sibling(idx.row(), 0);
    QString exp = model()->data(mi0).toString();
    QString iname = model()->data(mi0, INameRole).toString();
    QModelIndex mi1 = idx.sibling(idx.row(), 0);
    QString value = model()->data(mi1).toString();
    bool visual = false;
    if (idx.isValid()) {
        menu.addSeparator();
        if (m_type == LocalsType)
            act3 = new QAction("Watch expression '" + exp + "'", &menu);
        else 
            act3 = new QAction("Remove expression '" + exp + "'", &menu);
        menu.addAction(act3);
    
        visual = model()->data(mi0, VisualRole).toBool();
        act4 = new QAction("Watch expression '" + exp + "' in separate widget", &menu);
        act4->setCheckable(true);
        act4->setChecked(visual);
        // FIXME: menu.addAction(act4);
    }

    QAction *act = menu.exec(ev->globalPos());

    if (!act)
        ;
    else if (act == act1)
        resizeColumnsToContents();
    else if (act == act2)
        setAlwaysResizeColumnsToContents(!m_alwaysResizeColumnsToContents);
    else if (act == act3)
        if (m_type == LocalsType)
            emit requestWatchExpression(exp);
        else
            emit requestRemoveWatchExpression(iname);
    else if (act == act4)
        model()->setData(mi0, !visual, VisualRole);
}

void WatchWindow::resizeColumnsToContents()
{
    resizeColumnToContents(0);
    resizeColumnToContents(1);
}

void WatchWindow::setAlwaysResizeColumnsToContents(bool on)
{
    if (!header())
        return;
    m_alwaysResizeColumnsToContents = on;
    QHeaderView::ResizeMode mode = on 
        ? QHeaderView::ResizeToContents : QHeaderView::Interactive;
    header()->setResizeMode(0, mode);
    header()->setResizeMode(1, mode);
}

void WatchWindow::editItem(const QModelIndex &idx)
{
    Q_UNUSED(idx); // FIXME
}

void WatchWindow::reset()
{
    int row = 0;
    if (m_type == TooltipType)
        row = 1;
    else if (m_type == WatchersType)
        row = 2;
    //qDebug() << "WATCHWINDOW::RESET" << row;
    QTreeView::reset(); 
    setRootIndex(model()->index(row, 0, model()->index(0, 0)));
    //setRootIndex(model()->index(0, 0));
}

void WatchWindow::setModel(QAbstractItemModel *model)
{
    QTreeView::setModel(model);

    setRootIsDecorated(true);
    header()->setDefaultAlignment(Qt::AlignLeft);
    header()->setResizeMode(QHeaderView::ResizeToContents);
    if (m_type != LocalsType)
        header()->hide();

    connect(model, SIGNAL(modelAboutToBeReset()),
        this, SLOT(modelAboutToBeReset()));
    connect(model, SIGNAL(modelReset()),
        this, SLOT(modelReset()));
}

void WatchWindow::modelAboutToBeReset()
{
    m_blocked = true;
    //qDebug() << "Model about to be reset";
    m_expandedItems.clear();
    m_expandedItems.insert("local");
    m_expandedItems.insert("watch");
    modelAboutToBeResetHelper(model()->index(0, 0));
    //qDebug() << "   expanded: " << m_expandedItems;
}

void WatchWindow::modelAboutToBeResetHelper(const QModelIndex &idx)
{
    QString iname = model()->data(idx, INameRole).toString();
    //qDebug() << "Model about to be reset helper" << iname << idx
    //    << isExpanded(idx);
    if (isExpanded(idx))
        m_expandedItems.insert(iname);
    for (int i = 0, n = model()->rowCount(idx); i != n; ++i) {
        QModelIndex idx1 = model()->index(i, 0, idx);
        modelAboutToBeResetHelper(idx1);
    }
}

void WatchWindow::modelReset()
{
    //qDebug() << "Model reset";
    expand(model()->index(0, 0));
    modelResetHelper(model()->index(0, 0));
    m_blocked = false;
}

void WatchWindow::modelResetHelper(const QModelIndex &idx)
{
    QString name = model()->data(idx, Qt::DisplayRole).toString();
    QString iname = model()->data(idx, INameRole).toString();
    //qDebug() << "Model reset helper" << iname << name;
    if (m_expandedItems.contains(iname)) {
        expand(idx);
        for (int i = 0, n = model()->rowCount(idx); i != n; ++i) {
            QModelIndex idx1 = model()->index(i, 0, idx);
            modelResetHelper(idx1);
        }
    }
}

void WatchWindow::handleChangedItem(QWidget *widget)
{
    QLineEdit *lineEdit = qobject_cast<QLineEdit *>(widget);
    if (lineEdit)
        requestAssignValue("foo", lineEdit->text());
}