RE: Keyboard shortcuts

From: Martin, Marc <"Martin,>
Date: Mon, 5 Jan 2004 15:40:39 -0800

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>In fact I'd like to know how to handle keyboard events generally,
>e.g. a key press for suspending the execution of a program,
>followed by another key press to re-activate the program. Can
>anyone provide a simple example?

Here's an edited example from one of my programs:

-----
PROCEDURE HandleKey( v: View; key: CHAR );
CONST
  arrowLeft = 1CX;
  arrowRight = 1DX;
  arrowUp = 1EX;
  arrowDown = 1FX;
  esc = 1BX;
BEGIN
  CASE key OF

| arrowRight:
    settings.horizontal := settings.horizontal - 0.1;
    Views.Update(v, Views.keepFrames)

| arrowLeft:
    settings.horizontal := settings.horizontal + 0.1;
    Views.Update(v, Views.keepFrames)

| arrowDown:
     settings.vertical := settings.vertical + 0.1;
     Views.Update(v, Views.keepFrames)

| arrowUp:
    settings.vertical := settings.vertical - 0.1;
    Views.Update(v, Views.keepFrames)

| esc:
    settings.horizontal := 0;
    settings.vertical := 0;
    Views.Update(v, Views.keepFrames)

| "p", "P":
    pause := ~pause;
    Views.Update(v, Views.keepFrames)

  ELSE
  END
END HandleKey;


PROCEDURE ( v: View ) HandleCtrlMsg
( f: Views.Frame; VAR msg: Controllers.Message; VAR focus: Views.View );
BEGIN
  WITH msg: Controllers.EditMsg DO
    IF msg.op = Controllers.pasteChar THEN
      HandleKey( v, msg.char )
    END
  | msg: Controllers.TrackMsg DO
       HandleMouse( v, f, msg )
  ELSE
  END
END HandleCtrlMsg;
-----
--------------------------------------------

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Received on Tue Jan 06 2004 - 00:40:39 UTC