Obsolete QDirModel and remove it from the doc.

QFileSystemModel provides the same features as QDirModel but in a
efficient way so no need to keep QDirModel around.
This commit mark as obsolete QDirModel. Examples has been ported to
use QFileSystemModel instead. QCompleter also gain the support of
QFileSystemModel to complete nicely a line edit.

This commit also add a new signal in QFileSystemModel when the directory
is loaded, i.e. the thread has finished to read the current dir.

Task-number:QTBUG-3884
Reviewed-by:ogoffart
Reviewed-by:gabi
Reviewed-by:mbm

3 files changed, 59 insertions, 13 deletions

diff --git a/src/gui/util/qcompleter.cpp b/src/gui/util/qcompleter.cpp
index 30bccfb..eeabc22 100644
--- a/src/gui/util/qcompleter.cpp
+++ b/src/gui/util/qcompleter.cpp
@@ -62,7 +62,7 @@
 
     \snippet doc/src/snippets/code/src_gui_util_qcompleter.cpp 0
 
-    A QDirModel can be used to provide auto completion of file names.
+    A QFileSystemModel can be used to provide auto completion of file names.
     For example:
 
     \snippet doc/src/snippets/code/src_gui_util_qcompleter.cpp 1
@@ -120,7 +120,7 @@
     completion is then performed one level at a time.
 
     Let's take the example of a user typing in a file system path.
-    The model is a (hierarchical) QDirModel. The completion
+    The model is a (hierarchical) QFileSystemModel. The completion
     occurs for every element in the path. For example, if the current
     text is \c C:\Wind, QCompleter might suggest \c Windows to
     complete the current path element. Similarly, if the current text
@@ -130,12 +130,12 @@
     split the path into a list of strings that are matched at each level.
     For \c C:\Windows\Sy, it needs to be split as "C:", "Windows" and "Sy".
     The default implementation of splitPath(), splits the completionPrefix
-    using QDir::separator() if the model is a QDirModel.
+    using QDir::separator() if the model is a QFileSystemModel.
 
     To provide completions, QCompleter needs to know the path from an index.
     This is provided by pathFromIndex(). The default implementation of
     pathFromIndex(), returns the data for the \l{Qt::EditRole}{edit role}
-    for list models and the absolute file path if the mode is a QDirModel.
+    for list models and the absolute file path if the mode is a QFileSystemModel.
 
     \sa QAbstractItemModel, QLineEdit, QComboBox, {Completer Example}
 */
@@ -147,6 +147,7 @@
 #include "QtGui/qscrollbar.h"
 #include "QtGui/qstringlistmodel.h"
 #include "QtGui/qdirmodel.h"
+#include "QtGui/qfilesystemmodel.h"
 #include "QtGui/qheaderview.h"
 #include "QtGui/qlistview.h"
 #include "QtGui/qapplication.h"
@@ -470,9 +471,13 @@ QMatchData QCompletionEngine::filterHistory()
     QAbstractItemModel *source = c->proxy->sourceModel();
     if (curParts.count() <= 1 || c->proxy->showAll || !source)
         return QMatchData();
-    bool dirModel = false;
+    bool isDirModel = false;
+    bool isFsModel = false;
 #ifndef QT_NO_DIRMODEL
-    dirModel = (qobject_cast<QDirModel *>(source) != 0);
+    isDirModel = (qobject_cast<QDirModel *>(source) != 0);
+#endif
+#ifndef QT_NO_FILESYSTEMMODEL
+    isFsModel = (qobject_cast<QFileSystemModel *>(source) != 0);
 #endif
     QVector<int> v;
     QIndexMapper im(v);
@@ -482,7 +487,7 @@ QMatchData QCompletionEngine::filterHistory()
         QString str = source->index(i, c->column).data().toString();
         if (str.startsWith(c->prefix, c->cs)
 #if (!defined(Q_OS_WIN) || defined(Q_OS_WINCE)) && !defined(Q_OS_SYMBIAN)
-            && (!dirModel || QDir::toNativeSeparators(str) != QDir::separator())
+            && ((!isFsModel && !isDirModel) || QDir::toNativeSeparators(str) != QDir::separator())
 #endif
             )
             m.indices.append(i);
@@ -838,6 +843,13 @@ void QCompleterPrivate::_q_complete(QModelIndex index, bool highlighted)
                 completion += QDir::separator();
         }
 #endif
+#ifndef QT_NO_FILESYSTEMMODEL
+        // add a trailing separator in inline
+        if (mode == QCompleter::InlineCompletion) {
+            if (qobject_cast<QFileSystemModel *>(proxy->sourceModel()) && QFileInfo(completion).isDir())
+                completion += QDir::separator();
+        }
+#endif
     }
 
     if (highlighted) {
@@ -891,6 +903,14 @@ void QCompleterPrivate::showPopup(const QRect& rect)
         popup->show();
 }
 
+
+void QCompleterPrivate::_q_fileSystemModelDirectoryLoaded(const QString &path)
+{
+    Q_Q(QCompleter);
+    Q_UNUSED(path);
+    q->complete();
+}
+
 /*!
     Constructs a completer object with the given \a parent.
 */
@@ -971,7 +991,7 @@ QWidget *QCompleter::widget() const
     be list model or a tree model. If a model has been already previously set
     and it has the QCompleter as its parent, it is deleted.
 
-    For convenience, if \a model is a QDirModel, QCompleter switches its
+    For convenience, if \a model is a QFileSystemModel, QCompleter switches its
     caseSensitivity to Qt::CaseInsensitive on Windows and Qt::CaseSensitive
     on other platforms.
 
@@ -995,6 +1015,17 @@ void QCompleter::setModel(QAbstractItemModel *model)
 #endif
     }
 #endif // QT_NO_DIRMODEL
+#ifndef QT_NO_FILESYSTEMMODEL
+    QFileSystemModel *fsModel = qobject_cast<QFileSystemModel *>(model);
+    if (fsModel) {
+#if (defined(Q_OS_WIN) && !defined(Q_OS_WINCE)) || defined(Q_OS_SYMBIAN)
+        setCaseSensitivity(Qt::CaseInsensitive);
+#else
+        setCaseSensitivity(Qt::CaseSensitive);
+#endif
+        connect(fsModel, SIGNAL(directoryLoaded(QString)), this, SLOT(_q_fileSystemModelDirectoryLoaded(QString)));
+    }
+#endif // QT_NO_FILESYSTEMMODEL
 }
 
 /*!
@@ -1626,10 +1657,11 @@ QAbstractItemModel *QCompleter::completionModel() const
 
     The default implementation returns the \l{Qt::EditRole}{edit role} of the
     item for list models. It returns the absolute file path if the model is a
-    QDirModel.
+    QFileSystemModel.
 
     \sa splitPath()
 */
+
 QString QCompleter::pathFromIndex(const QModelIndex& index) const
 {
     Q_D(const QCompleter);
@@ -1639,10 +1671,15 @@ QString QCompleter::pathFromIndex(const QModelIndex& index) const
     QAbstractItemModel *sourceModel = d->proxy->sourceModel();
     if (!sourceModel)
         return QString();
+    bool isDirModel = false;
+    bool isFsModel = false;
 #ifndef QT_NO_DIRMODEL
-    QDirModel *dirModel = qobject_cast<QDirModel *>(sourceModel);
-    if (!dirModel)
+    isDirModel = qobject_cast<QDirModel *>(d->proxy->sourceModel()) != 0;
+#endif
+#ifndef QT_NO_FILESYSTEMMODEL
+    isFsModel = qobject_cast<QFileSystemModel *>(d->proxy->sourceModel()) != 0;
 #endif
+    if (!isDirModel && !isFsModel)
         return sourceModel->data(index, d->role).toString();
 
     QModelIndex idx = index;
@@ -1668,7 +1705,7 @@ QString QCompleter::pathFromIndex(const QModelIndex& index) const
     in the model().
 
     The default implementation of splitPath() splits a file system path based on
-    QDir::separator() when the sourceModel() is a QDirModel.
+    QDir::separator() when the sourceModel() is a QFileSystemModel.
 
     When used with list models, the first item in the returned list is used for
     matching.
@@ -1678,12 +1715,19 @@ QString QCompleter::pathFromIndex(const QModelIndex& index) const
 QStringList QCompleter::splitPath(const QString& path) const
 {
     bool isDirModel = false;
+    bool isFsModel = false;
 #ifndef QT_NO_DIRMODEL
     Q_D(const QCompleter);
     isDirModel = qobject_cast<QDirModel *>(d->proxy->sourceModel()) != 0;
 #endif
+#ifndef QT_NO_FILESYSTEMMODEL
+#ifdef QT_NO_DIRMODEL
+    Q_D(const QCompleter);
+#endif
+    isFsModel = qobject_cast<QFileSystemModel *>(d->proxy->sourceModel()) != 0;
+#endif
 
-    if (!isDirModel || path.isEmpty())
+    if ((!isDirModel && !isFsModel) || path.isEmpty())
         return QStringList(completionPrefix());
 
     QString pathCopy = QDir::toNativeSeparators(path);
diff --git a/src/gui/util/qcompleter.h b/src/gui/util/qcompleter.h
index c6ec75d..16cdac0 100644
--- a/src/gui/util/qcompleter.h
+++ b/src/gui/util/qcompleter.h
@@ -159,6 +159,7 @@ private:
     Q_PRIVATE_SLOT(d_func(), void _q_complete(QModelIndex))
     Q_PRIVATE_SLOT(d_func(), void _q_completionSelected(const QItemSelection&))
     Q_PRIVATE_SLOT(d_func(), void _q_autoResizePopup())
+    Q_PRIVATE_SLOT(d_func(), void _q_fileSystemModelDirectoryLoaded(const QString&))
 };
 
 #endif // QT_NO_COMPLETER
diff --git a/src/gui/util/qcompleter_p.h b/src/gui/util/qcompleter_p.h
index 107d85f..84a1a74 100644
--- a/src/gui/util/qcompleter_p.h
+++ b/src/gui/util/qcompleter_p.h
@@ -98,6 +98,7 @@ public:
     void _q_complete(QModelIndex, bool = false);
     void _q_completionSelected(const QItemSelection&);
     void _q_autoResizePopup();
+    void _q_fileSystemModelDirectoryLoaded(const QString &path);
     void setCurrentIndex(QModelIndex, bool = true);
 };