QNX RTOS v4 Knowledge Base
QNX RTOS v4 Knowledge Base
| Title |
Modal Dialog Example |
| Ref. No. |
QNX.000009532 |
| Category(ies) |
Development |
| Issue |
We need to create a modal dialog. Do you have any examples?
|
| Solution |
Note that this procedure is fully described and defined here:
Photon microGUI->Programmers Guide->Interprocess Communication and Lengthy Operations->Lengthy Operations->Modal Dialogs
For more eager developers who need an example, here is the basic outline:
- Create a blocking function that will block input to the parent window, and all other windows.
e.g.
void BlockWindows( int block )
{
PtWidget_t *widget;
PtArg_t argt;
PtSetArg( &argt, Pt_ARG_FLAGS, block ? Pt_BLOCKED : 0, Pt_BLOCKED );
widget = NULL;
while( NULL != ( widget = PtNextTopLevelWidget( widget ) ) )
if ( PtWidgetIsClass( widget, PtWindow ) )
PtSetResources( widget, 1, &argt );
} // **** See note at bottom regarding PtNextTopLevelWidget ***
- Calling this function will be as easy as:
BlockWindows( 1 );
// block the parent window or all windows.
- Using PtModalStart() and PtModalEnd(), invoke your module:
e.g.
count = PtModalStart();
ApCreateModule( ABM_your_module, NULL, NULL );
while( !var_set_when_module_is_destroyed ){
PtProcessEvent();
}
PtModalEnd( count );
- Unblock everything previously blocked by calling your function:
e.g.
BlockWindows( 0 );
// unblock what we blocked.
***NOTE***
If you don't have the latest Photon 1.13 patch then you may not have the PtNextTopLevelWidget() function, so here it is just in case
PtWidget_t *PtNextTopLevelWidget( PtWidget_t *widget )
{
PtWidgetList_t *wlp;
if( !widget )
{
if( _Pt_->top_level )
return _Pt_->top_level->widget;
return NULL;
}
widget = PtFindDisjoint( widget );
for( wlp = _Pt_->top_level; wlp; wlp = wlp->next )
if( wlp->widget == widget && wlp->next )
return wlp->next->widget;
return NULL;
} |
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