Edit control with autocompletion

Change-Id: Id3aefbffa6b36b475ca78856c9e103cef433f88c

include/svtools/autocmpledit.hxx

+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_SVTOOLS_AUTOCMPLEDIT_HXX
+#define INCLUDED_SVTOOLS_AUTOCMPLEDIT_HXX
+
+#include <svtools/svtdllapi.h>
+
+#include <vcl/edit.hxx>
+
+#include <vector>
+
+class SVT_DLLPUBLIC AutocompleteEdit : public Edit
+{
+private:
+    std::vector< OUString > m_aEntries;
+    std::vector< OUString > m_aMatching;
+    std::vector< OUString >::size_type m_nCurrent;
+
+    void AutoCompleteHandler( Edit* );
+    bool Match( const OUString& rText );
+    bool PreNotify( NotifyEvent& rNEvt );
+
+public:
+    AutocompleteEdit( vcl::Window* pParent );
+
+    void AddEntry( const OUString& rEntry );
+    void ClearEntries();
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

svtools/Library_svt.mk

@@ -107,6 +107,7 @@ $(eval $(call gb_Library_add_exception_objects,svt,\
     svtools/source/contnr/viewdataentry \
     svtools/source/control/accessibleruler \
     svtools/source/control/asynclink \
+    svtools/source/control/autocmpledit \
     svtools/source/control/breadcrumb \
     svtools/source/control/calendar \
     svtools/source/control/collatorres \

svtools/source/control/autocmpledit.cxx

+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <svtools/autocmpledit.hxx>
+#include <vcl/svapp.hxx>
+
+AutocompleteEdit::AutocompleteEdit( vcl::Window* pParent )
+    : Edit( pParent )
+    , m_nCurrent( 0 )
+{
+    SignalConnectAutocomplete( nullptr,
+            [this] ( Edit *const pEdit ) { this->AutoCompleteHandler( pEdit ); } );
+}
+
+void AutocompleteEdit::AddEntry( const OUString& rEntry )
+{
+    m_aEntries.push_back( rEntry );
+}
+
+void AutocompleteEdit::ClearEntries()
+{
+    m_aEntries.clear();
+    m_aMatching.clear();
+}
+
+void AutocompleteEdit::AutoCompleteHandler( Edit* )
+{
+    if( GetAutocompleteAction() != AUTOCOMPLETE_KEYINPUT )
+        return;
+
+    if( Application::AnyInput( VclInputFlags::KEYBOARD ) )
+        return;
+
+    OUString aCurText = GetText();
+    Selection aSelection( GetSelection() );
+
+    if( aSelection.Max() != aCurText.getLength() )
+        return;
+
+    sal_uInt16 nLen = ( sal_uInt16 )aSelection.Min();
+    aCurText = aCurText.copy( 0, nLen );
+    if( !aCurText.isEmpty() )
+    {
+        if( m_aEntries.size() )
+        {
+            if( Match( aCurText ) )
+            {
+                m_nCurrent = 0;
+                SetText( m_aMatching[0] );
+                sal_uInt16 nNewLen = m_aMatching[0].getLength();
+
+                Selection aSel( nLen, nNewLen );
+                SetSelection( aSel );
+            }
+        }
+    }
+}
+
+bool AutocompleteEdit::Match( const OUString& rText )
+{
+    bool bRet = false;
+
+    m_aMatching.clear();
+
+    for( std::vector< OUString >::size_type i = 0; i < m_aEntries.size(); ++i )
+    {
+        if( m_aEntries[i].startsWith( rText ) )
+        {
+            m_aMatching.push_back( m_aEntries[i] );
+            bRet = true;
+        }
+    }
+
+    return bRet;
+}
+
+bool AutocompleteEdit::PreNotify( NotifyEvent& rNEvt )
+{
+    if( rNEvt.GetType() == MouseNotifyEvent::KEYINPUT )
+    {
+        const KeyEvent& rEvent = *rNEvt.GetKeyEvent();
+        const vcl::KeyCode& rKey = rEvent.GetKeyCode();
+        vcl::KeyCode aCode( rKey.GetCode() );
+
+        if( ( aCode == KEY_UP || aCode == KEY_DOWN ) && !rKey.IsMod2() )
+        {
+            Selection aSelection( GetSelection() );
+            sal_uInt16 nLen = ( sal_uInt16 )aSelection.Min();
+
+            if( m_aMatching.size() &&
+                ( ( aCode == KEY_DOWN && m_nCurrent + 1 < m_aMatching.size() )
+                || ( aCode == KEY_UP && m_nCurrent > 0 ) ) )
+            {
+                SetText( m_aMatching[ aCode == KEY_DOWN ? ++m_nCurrent : --m_nCurrent ] );
+                SetSelection( Selection( nLen, GetText().getLength() ) );
+                return true;
+            }
+        }
+    }
+
+    return Edit::PreNotify( rNEvt );
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */