JvMouseGesture.pas

This unit implements mouse gestures. For this purpose actually two classes are available. one is the interpreter and can be used to enhance special components like a grid. In this case the programmer is responsible to fill matching OnMouseDown, OnMouseUp and OnMouseMove events of component. This works fine with MSWINDOWS and Linux The second component installs a hook for a specific application and fires an event after detecting a mouse gesture (Windows only in this version :-( ).

Programmers will get a string with the detected gesture from following matrix:

7	U	9
L	*	R
1	D	3

The asterix is the startpoint for the first vector. E.g. a gesture string "LU" means, user has first moved mouse to the left side and then up. There's no limit for complexity of a gesture ...

Notes

See demo project for usage ...

Classes

Class

Description

TJvMouseGesture

This class implements the basic interpreter. It can be used to enhance single components, too. E.g., if you want to enable a grid with gesture feature. For this purpose you have to do 4 steps:

1) Fill the "OnMouseDown" event with code like

TJvMouseGestureHook

This class implements a application wide mouse hook for mouse gestures. Programmers get only one event for a detected mouse gesture:

OnJvMouseGestureCustomInterpretation

Constants

Constant	Description
JVMG_DOWN	The text for this constant has been generated automatically. This means that it is not documented.
JVMG_LEFT
JVMG_LEFTLOWER	The text for this constant has been generated automatically. This means that it is not documented.
JVMG_LEFTUPPER	The text for this constant has been generated automatically. This means that it is not documented.
JVMG_RIGHT	The text for this constant has been generated automatically. This means that it is not documented.
JVMG_RIGHTLOWER	The text for this constant has been generated automatically. This means that it is not documented.
JVMG_RIGHTUPPER	The text for this constant has been generated automatically. This means that it is not documented.
JVMG_UP	The text for this constant has been generated automatically. This means that it is not documented.

Enumerations

Enumeration	Description
TJvActivationMode	Defines, whether or not the hook will be activated automatically or not.
TJvMouseGestureButton	This type defines a set of available buttons for the hook.

Functions

Function	Description
JvMouseGestureHook	Hook call back function. DO NOT USE EXTERN!

Types

Type	Description
TOnJvMouseGestureCustomInterpretation	Defines a complex gesture (two or more letters event)
TOnJvMouseGestureSimple	Defines a simple gesture (one letter event

Variables

Variable	Description
JvCurrentHook	contains the handle of the currently installed hook
JvMouseButtonDown	Some global vars to be accessed by call back function ...
JvMouseButtonUp	Some global vars to be accessed by call back function ...
JvMouseGestureHookActive	Some global vars to be accessed by call back function ...
JvMouseGestureHookAlreadyInstalled	Some global vars to be accessed by call back function ...
JvMouseGestureInterpreter	Object pointer to interpreter class used by hook

Links

Classes, Constants, Enumerations, Functions, Types, Variables