Board index » cppbuilder » CTRL-A and CTRL-Z in TEdit descendant -- closed

2003-11-10 03:15:35 PM
cppbuilder11
As for CTRL-A, keyboard hooks solved the problem:
TShiftState TestState;
TestState << ssCtrl;
...
if (Key == 65 && Shift == TestState) { // CTRL-A
if (Screen->ActiveForm != NULL &&
Screen->ActiveForm->ActiveControl != NULL)
{
// Enable CTRL-A (Select All) for edit fields
TWinControl *ActiveControl = Screen->ActiveForm->ActiveControl;
if (ActiveControl->InheritsFrom(__classid(TCustomEdit)))
((TCustomEdit*)ActiveControl)->SelectAll();
}
}
Ron Sommer
 

Ron Sommer wrote:
exactly do you test? I was trying WM_KEYDOWN and the
OnKeyDown event, not in a derived component but only subclassed.
Do you still get a beep?
 

I use an own event dispatcher component that enables all forms'
KeyPreview, and redirects it to an own message. It then lets any
component, that is interested in hooking keyboard messages, register
itself with the event dispatcher. However, the only component that does
that, is the main form, so actually I have set up an application-wide
key preview.
This main form then checks, if there is an active component, and if that
component is derived from TCustomEdit. If it is, it calls that
components' SelectAll(...) function, if CTRL-A is pressed.
With CTRL-Z, this didn't work - don't know why. I have therefore
followed your advice, intercept the EM_UNDO message and ignore it.
Therefore, there's no beep ...
Ron
 

{smallsort}

Ron Sommer wrote:
behavior wrapped into the component. Or do you create the event
dispatcher from within the component?
The win32.hlp topic "Edit Control Default Message Processing"
says of WM_CHAR:
"Writes a character to the single-line edit control and sends the
EN_UPDATE and EN_CHANGE notification messages to the
parent window. Writes a character to the multiline edit control.
Handles the accelerator keys for standard functions, such as
CTRL+C for copying and CTRL+V for pasting. In multiline edit
controls, also processes TAB, and CTRL+TAB keystrokes to
move among the controls in a dialog box and to insert tabs into
multiline edit controls. Uses the MessageBeep function for illegal
characters."
This may be the beep I am hearing. Somehow, setting the Key to
zero may not suppressing a subsequent WM_CHAR. I even tried
both both WM_KEYDOWN and WM_KEYUP.
 

works the way it does... ;-)
system sounds must be activated and assigned for that. But even with
system sounds enabled, I don't hear anything. Maybe because I'm using
single-line edits only...
Ron