AnalyzerBase: Extract some base classes from Valgrind

This makes the view of the valgrind tools avilable for other analyzers.

Change-Id: Icb28a3a6d6dbd7d437de803d50e30fada7dca0da
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/analyzerbase/detailederrorview.cpp

@@ -0,0 +1,294 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://www.qt.io/licensing.  For further information
+** use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#include "detailederrorview.h"
+
+#include <coreplugin/editormanager/editormanager.h>
+
+#include <utils/qtcassert.h>
+
+#include <QFontMetrics>
+#include <QPainter>
+#include <QScrollBar>
+
+namespace Analyzer {
+
+DetailedErrorDelegate::DetailedErrorDelegate(QListView *parent)
+    : QStyledItemDelegate(parent),
+      m_detailsWidget(0)
+{
+    connect(parent->verticalScrollBar(), &QScrollBar::valueChanged,
+            this, &DetailedErrorDelegate::onVerticalScroll);
+}
+
+QSize DetailedErrorDelegate::sizeHint(const QStyleOptionViewItem &opt,
+                                      const QModelIndex &index) const
+{
+    const QListView *view = qobject_cast<const QListView *>(parent());
+    const int viewportWidth = view->viewport()->width();
+    const bool isSelected = view->selectionModel()->currentIndex() == index;
+    const int dy = 2 * s_itemMargin;
+
+    if (!isSelected) {
+        QFontMetrics fm(opt.font);
+        return QSize(viewportWidth, fm.height() + dy);
+    }
+
+    if (m_detailsWidget && m_detailsIndex != index) {
+        m_detailsWidget->deleteLater();
+        m_detailsWidget = 0;
+    }
+
+    if (!m_detailsWidget) {
+        m_detailsWidget = createDetailsWidget(opt.font, index, view->viewport());
+        QTC_ASSERT(m_detailsWidget->parent() == view->viewport(),
+                   m_detailsWidget->setParent(view->viewport()));
+        m_detailsIndex = index;
+    } else {
+        QTC_ASSERT(m_detailsIndex == index, /**/);
+    }
+    const int widthExcludingMargins = viewportWidth - 2 * s_itemMargin;
+    m_detailsWidget->setFixedWidth(widthExcludingMargins);
+
+    m_detailsWidgetHeight = m_detailsWidget->heightForWidth(widthExcludingMargins);
+    // HACK: it's a bug in QLabel(?) that we have to force the widget to have the size it said
+    //       it would have.
+    m_detailsWidget->setFixedHeight(m_detailsWidgetHeight);
+    return QSize(viewportWidth, dy + m_detailsWidget->heightForWidth(widthExcludingMargins));
+}
+
+void DetailedErrorDelegate::paint(QPainter *painter, const QStyleOptionViewItem &basicOption,
+                                  const QModelIndex &index) const
+{
+    QStyleOptionViewItemV4 opt(basicOption);
+    initStyleOption(&opt, index);
+
+    const QListView *const view = qobject_cast<const QListView *>(parent());
+    const bool isSelected = view->selectionModel()->currentIndex() == index;
+
+    QFontMetrics fm(opt.font);
+    QPoint pos = opt.rect.topLeft();
+
+    painter->save();
+
+    const QColor bgColor = isSelected
+            ? opt.palette.highlight().color()
+            : opt.palette.background().color();
+    painter->setBrush(bgColor);
+
+    // clear background
+    painter->setPen(Qt::NoPen);
+    painter->drawRect(opt.rect);
+
+    pos.rx() += s_itemMargin;
+    pos.ry() += s_itemMargin;
+
+    if (isSelected) {
+        // only show detailed widget and let it handle everything
+        QTC_ASSERT(m_detailsIndex == index, /**/);
+        QTC_ASSERT(m_detailsWidget, return); // should have been set in sizeHint()
+        m_detailsWidget->move(pos);
+        // when scrolling quickly, the widget can get stuck in a visible part of the scroll area
+        // even though it should not be visible. therefore we hide it every time the scroll value
+        // changes and un-hide it when the item with details widget is paint()ed, i.e. visible.
+        m_detailsWidget->show();
+
+        const int viewportWidth = view->viewport()->width();
+        const int widthExcludingMargins = viewportWidth - 2 * s_itemMargin;
+        QTC_ASSERT(m_detailsWidget->width() == widthExcludingMargins, /**/);
+        QTC_ASSERT(m_detailsWidgetHeight == m_detailsWidget->height(), /**/);
+    } else {
+        // the reference coordinate for text drawing is the text baseline; move it inside the view rect.
+        pos.ry() += fm.ascent();
+
+        const QColor textColor = opt.palette.text().color();
+        painter->setPen(textColor);
+        // draw only text + location
+
+        const SummaryLineInfo info = summaryInfo(index);
+        const QString errorText = info.errorText;
+        painter->drawText(pos, errorText);
+
+        const int whatWidth = QFontMetrics(opt.font).width(errorText);
+        const int space = 10;
+        const int widthLeft = opt.rect.width() - (pos.x() + whatWidth + space + s_itemMargin);
+        if (widthLeft > 0) {
+            QFont monospace = opt.font;
+            monospace.setFamily(QLatin1String("monospace"));
+            QFontMetrics metrics(monospace);
+            QColor nameColor = textColor;
+            nameColor.setAlphaF(0.7);
+
+            painter->setFont(monospace);
+            painter->setPen(nameColor);
+
+            QPoint namePos = pos;
+            namePos.rx() += whatWidth + space;
+            painter->drawText(namePos, metrics.elidedText(info.errorLocation, Qt::ElideLeft,
+                                                          widthLeft));
+        }
+    }
+
+    // Separator lines (like Issues pane)
+    painter->setPen(QColor::fromRgb(150,150,150));
+    painter->drawLine(0, opt.rect.bottom(), opt.rect.right(), opt.rect.bottom());
+
+    painter->restore();
+}
+
+void DetailedErrorDelegate::onCurrentSelectionChanged(const QModelIndex &now,
+                                                      const QModelIndex &previous)
+{
+    if (m_detailsWidget) {
+        m_detailsWidget->deleteLater();
+        m_detailsWidget = 0;
+    }
+
+    m_detailsIndex = QModelIndex();
+    if (now.isValid())
+        emit sizeHintChanged(now);
+    if (previous.isValid())
+        emit sizeHintChanged(previous);
+}
+
+void DetailedErrorDelegate::onLayoutChanged()
+{
+    if (m_detailsWidget) {
+        m_detailsWidget->deleteLater();
+        m_detailsWidget = 0;
+        m_detailsIndex = QModelIndex();
+    }
+}
+
+void DetailedErrorDelegate::onViewResized()
+{
+    const QListView *view = qobject_cast<const QListView *>(parent());
+    if (m_detailsWidget)
+        emit sizeHintChanged(view->selectionModel()->currentIndex());
+}
+
+void DetailedErrorDelegate::onVerticalScroll()
+{
+    if (m_detailsWidget)
+        m_detailsWidget->hide();
+}
+
+void DetailedErrorDelegate::openLinkInEditor(const QString &link)
+{
+    const int pathStart = int(sizeof("file://")) - 1;
+    const int pathEnd = link.lastIndexOf(QLatin1Char(':'));
+    const QString path = link.mid(pathStart, pathEnd - pathStart);
+    const int line = link.mid(pathEnd + 1).toInt(0);
+    Core::EditorManager::openEditorAt(path, qMax(line, 0));
+}
+
+DetailedErrorView::DetailedErrorView(QWidget *parent)
+    : QListView(parent)
+{
+}
+
+DetailedErrorView::~DetailedErrorView()
+{
+    itemDelegate()->deleteLater();
+}
+
+void DetailedErrorView::setItemDelegate(QAbstractItemDelegate *delegate)
+{
+    QListView::setItemDelegate(delegate);
+
+    DetailedErrorDelegate *myDelegate = qobject_cast<DetailedErrorDelegate *>(itemDelegate());
+    connect(this, &DetailedErrorView::resized, myDelegate, &DetailedErrorDelegate::onViewResized);
+}
+
+void DetailedErrorView::setModel(QAbstractItemModel *model)
+{
+    QListView::setModel(model);
+
+    DetailedErrorDelegate *delegate = qobject_cast<DetailedErrorDelegate *>(itemDelegate());
+    QTC_ASSERT(delegate, return);
+
+    connect(selectionModel(), &QItemSelectionModel::currentChanged,
+            delegate, &DetailedErrorDelegate::onCurrentSelectionChanged);
+    connect(model, &QAbstractItemModel::layoutChanged,
+            delegate, &DetailedErrorDelegate::onLayoutChanged);
+}
+
+void DetailedErrorView::resizeEvent(QResizeEvent *e)
+{
+    emit resized();
+    QListView::resizeEvent(e);
+}
+
+void DetailedErrorView::updateGeometries()
+{
+    if (model()) {
+        QModelIndex index = model()->index(0, modelColumn(), rootIndex());
+        QStyleOptionViewItem option = viewOptions();
+        // delegate for row / column
+        QSize step = itemDelegate()->sizeHint(option, index);
+        horizontalScrollBar()->setSingleStep(step.width() + spacing());
+        verticalScrollBar()->setSingleStep(step.height() + spacing());
+    }
+    QListView::updateGeometries();
+}
+
+void DetailedErrorView::goNext()
+{
+    QTC_ASSERT(rowCount(), return);
+    setCurrentRow((currentRow() + 1) % rowCount());
+}
+
+void DetailedErrorView::goBack()
+{
+    QTC_ASSERT(rowCount(), return);
+    const int prevRow = currentRow() - 1;
+    setCurrentRow(prevRow >= 0 ? prevRow : rowCount() - 1);
+}
+
+int DetailedErrorView::rowCount() const
+{
+    return model() ? model()->rowCount() : 0;
+}
+
+int DetailedErrorView::currentRow() const
+{
+    const QModelIndex index = selectionModel()->currentIndex();
+    return index.row();
+}
+
+void DetailedErrorView::setCurrentRow(int row)
+{
+    const QModelIndex index = model()->index(row, 0);
+    selectionModel()->setCurrentIndex(index,
+            QItemSelectionModel::ClearAndSelect | QItemSelectionModel::Rows);
+    scrollTo(index);
+}
+
+} // namespace Analyzer