Typo fix for GetSizer.

[wxWidgets.git] / docs / latex / wx / keyevent.tex

diff --git a/docs/latex/wx/keyevent.tex b/docs/latex/wx/keyevent.tex
index 95552f42065b3ca5f1fad344d273cc91fcfe170c..0abdc667d4cd0915ff2f79e5a5b30fb8344b694b 100644 (file)
--- a/docs/latex/wx/keyevent.tex
+++ b/docs/latex/wx/keyevent.tex
@@ -2,6 +2,49 @@
 
 This event class contains information about keypress (character) events.
 
 
 This event class contains information about keypress (character) events.
 

+Notice that there are three different kinds of keyboard events in wxWindows:
+key down and up events and char events. The difference between the first two
+is clear - the first corresponds to a key press and the second to a key
+release - otherwise they are identical. Just note that if the key is
+maintained in a pressed state you will typically get a lot of (automatically
+generated) down events but only up one so it is wrong to assume that there is
+one up event corresponding to each down one.
+
+Both key events provide untranslated key codes while the char event carries
+the translated one. The untranslated code for alphanumeric keys is always
+an upper case value. For the other keys it is one of {\tt WXK\_XXX} values
+from the \helpref{keycodes table}{keycodes}. The translated key is, in
+general, the character the user expects to appear as the result of the key
+combination when typing the text into a text entry zone, for example.
+
+A few examples to clarify this (all assume that {\sc Caps Lock} is unpressed
+and the standard US keyboard): when the {\tt 'A'} key is pressed, the key down
+event key code is equal to {\tt ASCII A} $== 65$. But the char event key code
+is {\tt ASCII a} $== 97$. On the other hand, if you press both {\sc Shift} and
+{\tt 'A'} keys simultaneously , the key code in key down event will still be
+just {\tt 'A'} while the char event key code parameter will now be {\tt 'A'} 
+as well.
+
+Although in this simple case it is clear that the correct key code could be
+found in the key down event handler by checking the value returned by 
+\helpref{ShiftDown()}{wxkeyeventshiftdown}, in general you should use 
+{\tt EVT\_CHAR} for this as for non alphanumeric keys the translation is
+keyboard-layout dependent and can only be done properly by the system itself.
+
+Another kind of translation is done when the control key is pressed: for
+example, for {\sc Ctrl-A} key press the key down event still carries the
+same key code {\tt 'a'} as usual but the char event will have key code of
+$1$, the ASCII value of this key combination.
+
+You may discover how the other keys on your system behave interactively by
+running the \helpref{text}{sampletext} wxWindows sample and pressing some keys
+in any of the text controls shown in it.
+
+{\bf Note for Windows programmers:} The key and char events in wxWindows are
+similar to but slightly different from Windows {\tt WM\_KEYDOWN} and 
+{\tt WM\_CHAR} events. In particular, Alt-x combination will generate a char
+event in wxWindows (unless it is used as an acclerator).
+

 \wxheading{Derived from}
 
 \helpref{wxEvent}{wxevent}
 \wxheading{Derived from}
 
 \helpref{wxEvent}{wxevent}


@@ -17,11 +60,10 @@ functions that take a wxKeyEvent argument.
 
 \twocolwidtha{7cm}
 \begin{twocollist}\itemsep=0pt
 
 \twocolwidtha{7cm}
 \begin{twocollist}\itemsep=0pt

-\twocolitem{{\bf EVT\_CHAR(func)}}{Process a wxEVT\_CHAR event (a non-modifier key has been pressed).}

 \twocolitem{{\bf EVT\_KEY\_DOWN(func)}}{Process a wxEVT\_KEY\_DOWN event (any key has been pressed).}
 \twocolitem{{\bf EVT\_KEY\_UP(func)}}{Process a wxEVT\_KEY\_UP event (any key has been released).}
 \twocolitem{{\bf EVT\_CHAR(func)}}{Process a wxEVT\_CHAR event.}
 \twocolitem{{\bf EVT\_KEY\_DOWN(func)}}{Process a wxEVT\_KEY\_DOWN event (any key has been pressed).}
 \twocolitem{{\bf EVT\_KEY\_UP(func)}}{Process a wxEVT\_KEY\_UP event (any key has been released).}
 \twocolitem{{\bf EVT\_CHAR(func)}}{Process a wxEVT\_CHAR event.}

-\twocolitem{{\bf EVT\_CHAR\_HOOK(func)}}{Process a wxEVT\_CHAR\_HOOK event.}
+%\twocolitem{{\bf EVT\_CHAR\_HOOK(func)}}{Process a wxEVT\_CHAR\_HOOK event.}

 \end{twocollist}%
 
 \wxheading{See also}
 \end{twocollist}%
 
 \wxheading{See also}


@@ -93,6 +135,14 @@ Returns TRUE if the Alt key was down at the time of the key event.
 
 Returns TRUE if the control key was down at the time of the key event.
 
 
 Returns TRUE if the control key was down at the time of the key event.
 

+\membersection{wxKeyEvent::GetKeyCode}
+
+\constfunc{int}{GetKeyCode}{\void}
+
+Returns the virtual key code. ASCII events return normal ASCII values,
+while non-ASCII events return values such as {\bf WXK\_LEFT} for the
+left cursor key. See \helpref{Keycodes}{keycodes} for a full list of the virtual key codes.
+

 \membersection{wxKeyEvent::GetX}
 
 \constfunc{long}{GetX}{\void}
 \membersection{wxKeyEvent::GetX}
 
 \constfunc{long}{GetX}{\void}


@@ -105,14 +155,6 @@ Returns the X position of the event.
 
 Returns the Y position of the event.
 
 
 Returns the Y position of the event.
 

-\membersection{wxKeyEvent::KeyCode}
-
-\constfunc{long}{KeyCode}{\void}
-
-Returns the virtual key code. ASCII events return normal ASCII values,
-while non-ASCII events return values such as {\bf WXK\_LEFT} for the
-left cursor key. See \helpref{Keycodes}{keycodes} for a full list of the virtual key codes.
-

 \membersection{wxKeyEvent::MetaDown}
 
 \constfunc{bool}{MetaDown}{\void}
 \membersection{wxKeyEvent::MetaDown}
 
 \constfunc{bool}{MetaDown}{\void}


@@ -127,7 +169,18 @@ Returns TRUE if the Meta key was down at the time of the key event.
 
 Obtains the position at which the key was pressed.
 
 
 Obtains the position at which the key was pressed.
 

-\membersection{wxKeyEvent::ShiftDown}
+\membersection{wxKeyEvent::HasModifiers}
+
+\constfunc{bool}{HasModifiers}{\void}
+
+Returns TRUE if either {\sc Ctrl} or {\sc Alt} keys was down
+at the time of the key event. Note that this function does not take into
+account neither {\sc Shift} nor {\sc Meta} key states (the reason for ignoring
+the latter is that it is common for {\sc NumLock} key to be configured as 
+{\sc Meta} under X but the key presses even while {\sc NumLock} is on should
+be still processed normally).
+
+\membersection{wxKeyEvent::ShiftDown}\label{wxkeyeventshiftdown}

 
 \constfunc{bool}{ShiftDown}{\void}
 
 
 \constfunc{bool}{ShiftDown}{\void}