Modularize virtual keyboard and add an extension interface

With the extension interface it is possible to add new input
method and/or languages without recompiling the Qt Virtual
Keyboard plugin itself.

The existing input methods are now isolated into plugins.
So installing a new input method is a matter of copying the
corresponding extension plugin to the plugins/virtualkeyboard
directory (and any collateral required by the extension plugin
itself).

This change also renames the HunspellInputMethod to
DefaultInputMethod. This change is necessary because some other
extension plugin may want to provide the default input method
instead.

Implementation plan
===================
[x] Create virtualkeyboard-private module
[x] Create plugin library
[x] Define interface for input method plugin
[x] Define interface for keyboard layouts
[x] Move existing input methods and layouts to plugins
    [x] HangulInputMethod
    [x] HunspellInputMethod
        [x] Maybe create a private library for sharing
            between HunspellInputMethod and LipiInputMethod
    [x] LipiInputMethod
    [x] OpenWnnInputMethod
    [x] PinyinInputMethod
    [x] T9WriteInputMethod
    [x] TCInputMethod
[o] Rename some C++ classes (too generic name?)
[x] Think again replacing the QtVirtualKeyboard namespace
[x] Update documentation
    [x] General instructions for creating a plugin
    [x] For the C++ interfaces too (previously removed)

[ChangeLog][Important Behavior Changes] Introduce an extension
interface for the virtual keyboard. All the current input methods and
some special keyboard layouts (e.g. Hunspell, OpenWnn, etc.) have been
moved to extensions. The extension interface allows third party to
create a new input method without having to modify or rebuild the
virtual keyboard. In addition, this change makes it possible to add
features and languages independently by copying the desired extension
to the system.

[ChangeLog][Important Behavior Changes] Introduce a virtualkeyboard
module, which can be linked against an extension plugin. This module
provides the C++ API necessary for creating an input method.

[ChangeLog][Important Behavior Changes] Wrap the entire virtual
keyboard API into Qt namespace (e.g. QT_BEGIN_NAMESPACE/QT_END_NAMESPACE).

Task-number: QTBUG-57602
Change-Id: I449f4429109f596a7a1df7517c81f97d4aada27c
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

1 files changed, 0 insertions, 267 deletions

diff --git a/src/virtualkeyboard/3rdparty/lipi-toolkit/src/reco/shaperec/featureextractor/l7/L7ShapeFeature.h b/src/virtualkeyboard/3rdparty/lipi-toolkit/src/reco/shaperec/featureextractor/l7/L7ShapeFeature.h
deleted file mode 100644
index 6c767112..00000000
--- a/src/virtualkeyboard/3rdparty/lipi-toolkit/src/reco/shaperec/featureextractor/l7/L7ShapeFeature.h
+++ /dev/null
@@ -1,267 +0,0 @@
-/*****************************************************************************************
-* Copyright (c) 2006 Hewlett-Packard Development Company, L.P.
-* Permission is hereby granted, free of charge, to any person obtaining a copy of 
-* this software and associated documentation files (the "Software"), to deal in 
-* the Software without restriction, including without limitation the rights to use, 
-* copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the 
-* Software, and to permit persons to whom the Software is furnished to do so, 
-* subject to the following conditions:
-*
-* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-*
-* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
-* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 
-* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 
-* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
-* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE 
-* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 
-*****************************************************************************************/
-
-/************************************************************************
- * SVN MACROS
- *
- * $LastChangedDate: 2008-02-20 10:03:51 +0530 (Wed, 20 Feb 2008) $
- * $Revision: 423 $
- * $Author: sharmnid $
- *
- ************************************************************************/
-#include "LTKShapeFeature.h"
-
-
-
-/** @ingroup L7ShapeFeatureExtractor
-* @brief The feature representation class for L7 features
-* This class represents X and Y coordinates, Normalized X and Y First Derivatives, Normalized X and Y Second Derivatives and the Curvature values of a point.
-* @class L7ShapeFeature
-*
-*/
-class L7ShapeFeature : public LTKShapeFeature
-{
-	/** @name private data members */
-	//@{
-
-private:
-	/** @brief X value  */
-	float m_x;					
-
-	/** @brief Y value  */
-	float m_y;
-	
-	/** @brief Normalized First Derivative w.r.t X  */
-	float m_xFirstDerv;
-
-	/** @brief Normalized First Derivative w.r.t Y  */
-	float m_yFirstDerv;
-
-    /** @brief Normalized Second Derivative w.r.t X  */
-	float m_xSecondDerv;
-
-	/** @brief Normalized Second Derivative w.r.t Y  */
-	float m_ySecondDerv;
-
-	/** @brief Curvature value */
-	float m_curvature;
-	
-	/** @brief Pen-up information */
-	bool m_penUp;
-
-	/** @brief Delimiter character  */
-    string m_data_delimiter;
-	//@}
-	
-public:
-	
-	/** @name Constructors and Destructor */
-	//@{
-
-	/**
-	* Default Constructor.
-	*/
-	L7ShapeFeature();
-
-    /** parameterized constructor
-        */
-    L7ShapeFeature(float inX, float inY, float inXFirstDerv, float inYFirstDerv,
-                   float inXSecondDerv, float inYSecondDerv, float inCurvature,
-                   bool inPenUp);
-    
-	/**
-	* Default destructor.
-	*/
-	~L7ShapeFeature();
-	
-	/**
-	* Returns the value of the class data member L7ShapeFeature::m_x
-	*/
-	float getX() const;
-
-	/**
-	* Returns the value of the class data member L7ShapeFeature::m_y
-	*/
-	float getY() const;
-
-	/**
-	* Returns the value of the class data member L7ShapeFeature::m_xFirstDerv
-	*/
-	float getXFirstDerv() const;
-
-	/**
-	* Returns the value of the class data member L7ShapeFeature::m_yFirstDerv
-	*/
-	float getYFirstDerv() const;
-
-	/**
-	* Returns the value of the class data member L7ShapeFeature::m_xSecondDerv
-	*/
-	float getXSecondDerv() const;
-
-	/**
-	* Returns the value of the class data member L7ShapeFeature::m_ySecondDerv
-	*/
-	float getYSecondDerv() const;
-
-	/**
-	* Returns the value of the class data member L7ShapeFeature::m_curvature
-	*/
-	float getCurvature() const;
-
-	/**
-	* Returns the value of the class data member L7ShapeFeature::m_penUp
-	*/
-	bool isPenUp() const;
-
-	/**
-	* Sets the value of L7ShapeFeature::m_x
-	*/	
-	void setX(float x);
-
-	/**
-	* Sets the value of L7ShapeFeature::m_y
-	*/	
-	void setY(float y);
-
-	/**
-	* Sets the value of L7ShapeFeature::m_xFirstDerv
-	*/	
-	void setXFirstDerv(float xFirstDerv);
-
-	/**
-	* Sets the value of L7ShapeFeature::m_yFirstDerv
-	*/	
-
-	void setYFirstDerv(float yFirstDerv);
-	/**
-	* Sets the value of L7ShapeFeature::m_xSecondDerv
-	*/	
-	void setXSecondDerv(float xSecondDerv);
-
-	/**
-	* Sets the value of L7ShapeFeature::m_ySecondDerv
-	*/	
-	void setYSecondDerv(float ySecondDerv);
-
-	/**
-	* Sets the value of L7ShapeFeature::m_curvature
-	*/	
-	void setCurvature(float curvature);
-	
-	/**
-	* Sets the value of L7ShapeFeature::m_penUp
-	*/
-	void setPenUp(bool penUp);
-
-	
-	/**
-	* @brief Initializes an instance of L7ShapeFeature from the string passed as parameter.
-	*
-	* <b>Semantics</b>
-	*
-	*	- Tokenize the input string on L7ShapeFeature::m_data_delimiter using StringTokenizer::tokenizeString
-	*	- Initialize the data members of the class with the tokens returned.
-	*
-	* @param initString : string& : Reference to the initialization string.
-	*
-	* @return FAILURE : If the initalization string contains more than or less than seven tokens (after tokenizing on L7ShapeFeature::m_data_delimiter)
-	* @return SUCCESS : If initialization done without any errors.
-	*	
-	*/
-
-    //see interface
-	int initialize(const string& initString);
-
-    int initialize(const floatVector& initFloatVector);
-
-	/**
-	* @brief  Gives the string representation of the L7ShapeFeature instance
-	*/
-    //see interface
-	void toString(string& strFeat) const;
-	
-	/**
-	* This method implements the clone pattern and returns a cloned instance of the invoking L7ShapeFeature object
-	*/	
-	LTKShapeFeaturePtr clone() const;
-    
-    
-	/**
-	* @brief Computes the Euclidean Distance between two L7ShapeFeature instances.
-	* Computes  the square root of ( (m_x-passed_x)^2 + (m_y-passed_y)^2+ (m_xFirstDerv-passed_x1)^2 +(m_yFirstDerv-passed_y1)^2+(m_xSecondDerv-passed_x2)^2+(m_ySecondDerv-passed_y2)^2+(m_curvature-passed_curvature)^2).
-	* @param f : LTKShapeFeature* : Base class pointer holding a pointer to L7ShapeFeature instance from which the distance to the invoking object is to be computed.
-	*
-	* @return float : Distance between two points in the LocalSeven feature representation
-	*
-	*/
-	void getDistance(const LTKShapeFeaturePtr& shapeFeaturePtr, float& outDistance) const;
-	
-	/**
-	* @brief Adds two L7ShapeFeature instances.
-	* Computes the sum of the member variables of the passed LTKShapeFeature object and the invoking LTKShapeFeature object. The new member variables are stored in a newly created L7ShapeFeature object. Neither the invoking nor the passed object object are changed.
-	* new_x=m_x+ (*secondFeature).m_x;
-	* @param secondFeature : LTKShapeFeature* : Base class pointer holding a pointer to the L7ShapeFeature instance which is to be added to the invoking L7ShapeFeature object.
-	*
-	* @return LTKShapeFeature* : Base class pointer to the L7ShapeFeature instance holding the result of the addition operation.
-	*	
-	*/
-	int addFeature(const LTKShapeFeaturePtr& secondFeature, LTKShapeFeaturePtr& outResult ) const;
-
-	/**
-	* @brief Subtracts two L7ShapeFeature instances.
-	* Subtracts the member variables of the passed LTKShapeFeature object from the invoking LTKShapeFeature object. The new member variables are stored in a newly created L7ShapeFeature object, which is returned. Neither the invoking nor the passed object object are changed.
-	* new_x=m_x-(*secondFeature).m_x;
-	*
-	* @param secondFeature : LTKShapeFeature* : Base class pointer holding a pointer to the L7ShapeFeature instance which is to be subtracted.
-	*
-	* @return LTKShapeFeature* : Base class pointer to the L7ShapeFeature instance holding the result of the subtraction operation.
-	*	
-	*/
-	int subtractFeature(const LTKShapeFeaturePtr& secondFeature, LTKShapeFeaturePtr& outResult ) const;
-
-	/**
-	* @brief Scales the L7ShapeFeature feature by a scalar (float value).
-	* Mulitplies all the member variables of the invoking L7ShapeFeature object by alpha. The new member variables are stored in a newly created L7ShapeFeature object, which is returned. The invoking LTKShapeFeature object is not changed.
-	* new_x=alpha*m_x
-	*
-	* @param alpha : float: The float value by which all the member variables should be multiplied.
-	* @return LTKShapeFeature* : Base class pointer to the L7ShapeFeature instance holding the result of the scaling operation .
-	*	
-	*/
-	int scaleFeature(float alpha, LTKShapeFeaturePtr& outResult) const;
-
-	/**
-	* Converts the LocalSeven feature instance into a float vector. The elements of the float vector are m_x,m_y,m_xFirstDerv,m_yFirstDerv,m_xSecondDerv,m_ySecondDerv and m_curvature in this order.
-	* @param floatVec: vector<float>&: The float vector which will contain the member values. 
-	* @return int : returns SUCCESS or FAILURE
-	*	
-	*/
-	int toFloatVector(vector<float>& floatVec);
-	
-	/**
-	* Converts the LocalSeven feature instance into a integer vector. The elements of the int vector are m_x,m_y,m_xFirstDerv,m_yFirstDerv,m_xSecondDerv,m_ySecondDerv and m_curvature in this order.
-	* @param intVec: vector<int>&: The int vector which will contain the member values. 
-	* @return int : returns SUCCESS or FAILURE
-	*	
-	*/
-	int toIntVector(vector<int>& intVec);
-
-    int getFeatureDimension();
-};