iOS: Add text selection support from the platform plugin

This patch will add touch based text selection support
to Qt from the iOS plugin.

QIOSTextInputOverlay will listen to changes to the
focus object, and if IM enabled, create three different
gesture recognizers that tracks what the user is doing.

The first recogniser detects if the user does a press
and hold on the text when there is no selection. If
triggered, it will show a loupe that follows the touch
around together with the cursor.

The second recogniser will instead be active when text
is selected, and takes care of drawing a set of handles
on each side of the selection. If the user drags on any
of the handles, a loupe will show that follows the
touch/text line together with the handle.

The third recogniser detects if the user does a tap, and
depending on if there's a selection, or if the cursor didn't
move, it will show or hide the edit menu.

The handles and loupe are implemented as overlays using
Core Animation layers.

Change-Id: Idff6e40e12307a458c9c399b0487bb976fce29c8
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/src/plugins/platforms/ios/qiostextinputoverlay.h b/src/plugins/platforms/ios/qiostextinputoverlay.h
new file mode 100644
index 0000000000..2f01993b19
--- /dev/null
+++ b/src/plugins/platforms/ios/qiostextinputoverlay.h
@@ -0,0 +1,64 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** 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 The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. 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.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QIOSTEXTEDITOVERLAY_H
+#define QIOSTEXTEDITOVERLAY_H
+
+#include <QtCore/QObject>
+
+Q_FORWARD_DECLARE_OBJC_CLASS(QIOSEditMenu);
+Q_FORWARD_DECLARE_OBJC_CLASS(QIOSCursorRecognizer);
+Q_FORWARD_DECLARE_OBJC_CLASS(QIOSSelectionRecognizer);
+Q_FORWARD_DECLARE_OBJC_CLASS(QIOSTapRecognizer);
+
+QT_BEGIN_NAMESPACE
+
+class QIOSTextInputOverlay : public QObject
+{
+public:
+    QIOSTextInputOverlay();
+    ~QIOSTextInputOverlay();
+
+    static QIOSEditMenu *s_editMenu;
+
+private:
+    QIOSCursorRecognizer *m_cursorRecognizer;
+    QIOSSelectionRecognizer *m_selectionRecognizer;
+    QIOSTapRecognizer *m_openMenuOnTapRecognizer;
+
+    void updateFocusObject();
+};
+
+QT_END_NAMESPACE
+
+#endif