Introducing TreeView

The TreeView, as currently implemented, extends the
TableView by adding support for hierarchical models. In
the broad sense, it remains a list view with columns,
like TableView.

The main architecture is based on TreeModelAdaptor, that
wraps the hierarchical model. It keeps track of which
items are expanded or collapsed, and also relays model
changes to the view. (TreeModelAdaptor is a private type
and should be considered as an implementation detail.)

The TreeView only supports QAbstractItemModels for the
time being, and, just like TableView, relies on roles to
pass the data to the view. This also means that model
columns are not supported.

Selection is supported by ItemSelectionModel which exposes
part of the API of QItemSelectionModel. For this, support
has been added for QModelIndex and related classes. This
requires importing QtQml.Models 2.2 should an actual usage
of the TreeView use selection.

In the same way, TreeViewStyle currently extends TableViewStyle
with the relevant features, like branch indicator.

[ChangeLog][QtQuick.Controls] Introducing TreeView

With-Help-From: Caroline Chao <caroline.chao@theqtcompany.com>
Change-Id: Id3dba240a732744571e4a646b7b98678ab522da6
Reviewed-by: Caroline Chao <caroline.chao@theqtcompany.com>

6 files changed, 223 insertions, 1 deletions

diff --git a/examples/quick/controls/controls.pro b/examples/quick/controls/controls.pro
index f6696bc5..2b164dc2 100644
--- a/examples/quick/controls/controls.pro
+++ b/examples/quick/controls/controls.pro
@@ -5,7 +5,8 @@ SUBDIRS += \
     tableview \
     touch \
     basiclayouts \
-    styles
+    styles \
+    filesystembrowser
 
 qtHaveModule(widgets) {
     SUBDIRS += texteditor
diff --git a/examples/quick/controls/filesystembrowser/deployment.pri b/examples/quick/controls/filesystembrowser/deployment.pri
new file mode 100644
index 00000000..5441b63d
--- /dev/null
+++ b/examples/quick/controls/filesystembrowser/deployment.pri
@@ -0,0 +1,27 @@
+android-no-sdk {
+    target.path = /data/user/qt
+    export(target.path)
+    INSTALLS += target
+} else:android {
+    x86 {
+        target.path = /libs/x86
+    } else: armeabi-v7a {
+        target.path = /libs/armeabi-v7a
+    } else {
+        target.path = /libs/armeabi
+    }
+    export(target.path)
+    INSTALLS += target
+} else:unix {
+    isEmpty(target.path) {
+        qnx {
+            target.path = /tmp/$${TARGET}/bin
+        } else {
+            target.path = /opt/$${TARGET}/bin
+        }
+        export(target.path)
+    }
+    INSTALLS += target
+}
+
+export(INSTALLS)
diff --git a/examples/quick/controls/filesystembrowser/filesystembrowser.pro b/examples/quick/controls/filesystembrowser/filesystembrowser.pro
new file mode 100644
index 00000000..1cdc565a
--- /dev/null
+++ b/examples/quick/controls/filesystembrowser/filesystembrowser.pro
@@ -0,0 +1,13 @@
+TEMPLATE = app
+
+QT += qml quick widgets
+
+SOURCES += main.cpp
+
+RESOURCES += qml.qrc
+
+# Additional import path used to resolve QML modules in Qt Creator's code model
+QML_IMPORT_PATH =
+
+# Default rules for deployment.
+include(deployment.pri)
diff --git a/examples/quick/controls/filesystembrowser/main.cpp b/examples/quick/controls/filesystembrowser/main.cpp
new file mode 100644
index 00000000..e64a9a22
--- /dev/null
+++ b/examples/quick/controls/filesystembrowser/main.cpp
@@ -0,0 +1,58 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QApplication>
+#include <QQmlApplicationEngine>
+#include <QtQml>
+#include <QFileSystemModel>
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+
+    QQmlApplicationEngine engine;
+    QFileSystemModel *fsm = new QFileSystemModel(&engine);
+    fsm->setRootPath(QDir::homePath());
+    fsm->setResolveSymlinks(true);
+    engine.rootContext()->setContextProperty("fileSystemModel", fsm);
+    engine.load(QUrl(QStringLiteral("qrc:///main.qml")));
+
+    return app.exec();
+}
diff --git a/examples/quick/controls/filesystembrowser/main.qml b/examples/quick/controls/filesystembrowser/main.qml
new file mode 100644
index 00000000..4b182b73
--- /dev/null
+++ b/examples/quick/controls/filesystembrowser/main.qml
@@ -0,0 +1,118 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.2
+import QtQuick.Controls 1.4
+import QtQml.Models 2.2
+
+ApplicationWindow {
+    visible: true
+    width: 640
+    height: 480
+    title: qsTr("File System")
+
+    menuBar: MenuBar {
+        Menu {
+            title: qsTr("File")
+            MenuItem {
+                text: qsTr("Exit")
+                onTriggered: Qt.quit();
+            }
+        }
+    }
+
+    Row {
+        id: row
+        anchors.top: parent.top
+        anchors.topMargin: 12
+        anchors.horizontalCenter: parent.horizontalCenter
+
+        ExclusiveGroup {
+            id: eg
+        }
+
+        Repeater {
+            model: [ "None", "Single", "Extended", "Multi", "Contig."]
+            Button {
+                text: modelData
+                exclusiveGroup: eg
+                checkable: true
+                checked: index === 1
+                onClicked: view.selectionMode = index
+            }
+        }
+    }
+
+    ItemSelectionModel {
+        id: sel
+        model: fileSystemModel
+        onSelectionChanged: {
+            console.log("selected", selected)
+            console.log("deselected", deselected)
+            console.log("selection", sel.selection())
+        }
+        onCurrentChanged: console.log("current", current)
+    }
+
+    TreeView {
+        id: view
+        anchors.fill: parent
+        anchors.margins: 2 * 12 + row.height
+        model: fileSystemModel
+        selection: sel
+
+        onCurrentIndexChanged: console.log("current index", currentIndex)
+
+        TableViewColumn {
+            title: "Name"
+            role: "fileName"
+            resizable: true
+        }
+
+        TableViewColumn {
+            title: "Permissions"
+            role: "filePermissions"
+            resizable: true
+        }
+
+        onClicked: console.log("clicked", index)
+        onDoubleClicked: isExpanded(index) ? collapse(index) : expand(index)
+    }
+}
diff --git a/examples/quick/controls/filesystembrowser/qml.qrc b/examples/quick/controls/filesystembrowser/qml.qrc
new file mode 100644
index 00000000..5f6483ac
--- /dev/null
+++ b/examples/quick/controls/filesystembrowser/qml.qrc
@@ -0,0 +1,5 @@
+<RCC>
+    <qresource prefix="/">
+        <file>main.qml</file>
+    </qresource>
+</RCC>