Taskwindow: Speed up the task window

Make the taskwindow semi-graciously handle my Qt Creator build
with 91k build issues.

Change-Id: I47275e2057d2ff9bf5229f0a367bb19c4f3141e4
Task-number: QTCREATORBUG-1551
Reviewed-on: http://codereview.qt-project.org/5263
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>

src/plugins/projectexplorer/taskmodel.h

@@ -0,0 +1,187 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (info@qt.nokia.com)
+**
+**
+** GNU Lesser General Public License Usage
+**
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this file.
+** Please review the following information to ensure the GNU Lesser General
+** Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** Other Usage
+**
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at info@qt.nokia.com.
+**
+**************************************************************************/
+
+#include <QtCore/QAbstractItemModel>
+
+#include <QtGui/QIcon>
+
+#include "task.h"
+
+namespace ProjectExplorer {
+namespace Internal {
+
+class TaskModel : public QAbstractItemModel
+{
+    Q_OBJECT
+
+public:
+    // Model stuff
+    TaskModel(QObject *parent);
+
+    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const;
+    QModelIndex parent(const QModelIndex &child) const;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const;
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
+    Task task(const QModelIndex &index) const;
+
+    QStringList categoryIds() const;
+    QString categoryDisplayName(const QString &categoryId) const;
+    void addCategory(const QString &categoryId, const QString &categoryName);
+
+    QList<Task> tasks(const QString &categoryId = QString()) const;
+    void addTask(const Task &task);
+    void removeTask(const Task &task);
+    void clearTasks(const QString &categoryId = QString());
+
+    int sizeOfFile(const QFont &font);
+    int sizeOfLineNumber(const QFont &font);
+    void setFileNotFound(const QModelIndex &index, bool b);
+
+    enum Roles { File = Qt::UserRole, Line, Description, FileNotFound, Type, Category, Icon, Task_t };
+
+    QIcon taskTypeIcon(Task::TaskType t) const;
+
+    int taskCount(const QString &category);
+    int errorTaskCount(const QString &category);
+    int warningTaskCount(const QString &category);
+
+    bool hasFile(const QModelIndex &index) const;
+
+private:
+
+    class CategoryData
+    {
+    public:
+        CategoryData() : count(0), warnings(0), errors(0) { }
+
+        void addTask(const Task &task)
+        {
+            ++count;
+            if (task.type == Task::Warning)
+                ++warnings;
+            else if (task.type == Task::Error)
+                ++errors;
+        }
+
+        void removeTask(const Task &task)
+        {
+            --count;
+            if (task.type == Task::Warning)
+                --warnings;
+            else if (task.type == Task::Error)
+                --errors;
+        }
+
+        void clear() {
+            count = 0;
+            warnings = 0;
+            errors = 0;
+        }
+
+        QString displayName;
+        int count;
+        int warnings;
+        int errors;
+    };
+
+    QHash<QString,CategoryData> m_categories; // category id to data
+    QList<Task> m_tasks;   // all tasks (in order of insertion)
+
+    QHash<QString,bool> m_fileNotFound;
+    int m_maxSizeOfFileName;
+    int m_lastMaxSizeIndex;
+    QFont m_fileMeasurementFont;
+    const QIcon m_errorIcon;
+    const QIcon m_warningIcon;
+    int m_sizeOfLineNumber;
+    QFont m_lineMeasurementFont;
+};
+
+class TaskFilterModel : public TaskModel
+{
+    Q_OBJECT
+
+public:
+    TaskFilterModel(TaskModel *sourceModel, QObject *parent = 0);
+
+    TaskModel *taskModel() { return m_sourceModel; }
+
+    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const;
+    QModelIndex parent(const QModelIndex &child) const;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const;
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
+
+    bool filterIncludesUnknowns() const { return m_includeUnknowns; }
+    void setFilterIncludesUnknowns(bool b) { m_includeUnknowns = b; invalidateFilter(); }
+
+    bool filterIncludesWarnings() const { return m_includeWarnings; }
+    void setFilterIncludesWarnings(bool b) { m_includeWarnings = b; invalidateFilter(); }
+
+    bool filterIncludesErrors() const { return m_includeErrors; }
+    void setFilterIncludesErrors(bool b) { m_includeErrors = b; invalidateFilter(); }
+
+    QStringList filteredCategories() const { return m_categoryIds; }
+    void setFilteredCategories(const QStringList &categoryIds) { m_categoryIds = categoryIds; invalidateFilter(); }
+
+    Task task(const QModelIndex &index) const
+    { return m_sourceModel->task(mapToSource(index)); }
+
+    bool hasFile(const QModelIndex &index) const
+    { return m_sourceModel->hasFile(mapToSource(index)); }
+
+private slots:
+    void handleNewRows(const QModelIndex &index, int first, int last);
+    void handleRemovedRows(const QModelIndex &index, int first, int last);
+    void handleDataChanged(QModelIndex,QModelIndex bottom);
+    void handleReset();
+
+private:
+    QModelIndex mapToSource(const QModelIndex &index) const;
+    void invalidateFilter();
+    void updateMapping() const;
+    bool filterAcceptsTask(const Task &task) const;
+
+    bool m_includeUnknowns;
+    bool m_includeWarnings;
+    bool m_includeErrors;
+    QStringList m_categoryIds;
+
+    mutable QList<int> m_mapping;
+    mutable bool m_mappingUpToDate;
+
+    TaskModel *m_sourceModel;
+};
+
+} // namespace Internal
+} // namespace ProjectExplorer