ciderpress/util/Modeless.h

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2007-03-27 17:47:10 +00:00
/*
* CiderPress
* Copyright (C) 2007 by faddenSoft, LLC. All Rights Reserved.
* See the file LICENSE for distribution terms.
*/
/*
* Trivial implementation of a modeless dialog box.
*/
#ifndef __MODELESS__
#define __MODELESS__
/*
* This class must be allocated on the heap, and destroyed by calling
* DestroyWindow(). Do not delete the object or call EndDialog().
*
* To use, call Create(dialogID, pParentWnd). Make sure "visible" is set to
* "true" in the dialog properties.
*
* For "progress" dialogs: immediately before creating the window with Create,
* disable the main window with EnableWindow(FALSE). That prevents it from
* getting user input. When you're done, re-enable it with
* EnableWindow(TRUE), and then DestroyWindow on this object. (If you do it
* the other way, some other window will get focus, and you have to use
* SetActiveWindow() to get it back... but that causes a UI flash.) This
* behavior is now implemented in ExclusiveModelessDialog.
*/
class ModelessDialog : public CDialog {
public:
ModelessDialog(void) : fOkayToDelete(false) {}
virtual ~ModelessDialog(void) { ASSERT(fOkayToDelete); }
/*
* OK button clicked. Must override to prevent standard EndDialog
* behavior.
*/
virtual void OnOK(void) {
if (UpdateData() != FALSE) // try the DDX/DDV stuff, if any
DestroyWindow();
}
/*
* ESC key hit or Cancel button clicked. Must override to prevent
* standard EndDialog behavior.
*/
virtual void OnCancel(void) {
DestroyWindow();
}
protected:
void PostNcDestroy(void) {
// this may not arrive immediately
fOkayToDelete = true;
delete this;
}
private:
bool fOkayToDelete; // sanity check
};
/*
* Variant of ModelessDialog that handles enabling and disabling the parent
* window.
*/
class ExclusiveModelessDialog : public ModelessDialog {
public:
ExclusiveModelessDialog(void) : fpParentWnd(nil) {}
virtual ~ExclusiveModelessDialog(void) {};
/* disable the parent window before we're created */
BOOL Create(int dialogID, CWnd* pParentWnd = NULL) {
ASSERT(pParentWnd != nil); // else what's the point?
if (pParentWnd != nil) {
fpParentWnd = pParentWnd;
fpParentWnd->EnableWindow(FALSE);
}
return ModelessDialog::Create(dialogID, pParentWnd);
}
/* enable the parent window before we're destroyed */
virtual BOOL DestroyWindow(void) {
if (fpParentWnd != nil)
fpParentWnd->EnableWindow(TRUE);
return ModelessDialog::DestroyWindow();
}
private:
CWnd* fpParentWnd;
};
/*
From DLGCORE.CPP line 516:
// disable parent (before creating dialog)
HWND hWndParent = PreModal(); // ATM: finds parent of modal dlg
AfxUnhookWindowCreate();
BOOL bEnableParent = FALSE;
if (hWndParent != NULL && ::IsWindowEnabled(hWndParent))
{
::EnableWindow(hWndParent, FALSE);
bEnableParent = TRUE;
}
[...]
if (bEnableParent)
::EnableWindow(hWndParent, TRUE);
if (hWndParent != NULL && ::GetActiveWindow() == m_hWnd)
::SetActiveWindow(hWndParent);
// destroy modal window
DestroyWindow();
PostModal();
*/
#endif /*__MODELESS__*/