Boolean
HandleMenuOpenEvent(EventType *event)
{
DmSearchStateType searchState;
UInt16 cardNo;
LocalID dbID;
Boolean needsSeparator=false;
if (DmGetNextDatabaseByTypeCreator(true, &searchState, 0, UNICHAT_APP_CREATOR, true, &cardNo, &dbID) != dmErrCantFind) {
MenuAddItem(MENUITEM_exams, MENUITEM_chat, 'C', "UniChat");
needsSeparator=true;
}
if (DmGetNextDatabaseByTypeCreator(true, &searchState, 0, UNIMENSA_APP_CREATOR, true, &cardNo, &dbID) != dmErrCantFind) {
MenuAddItem(MENUITEM_exams, MENUITEM_mensa, 'M', "UniMensa");
needsSeparator=true;
}
if (needsSeparator) {
Char tmpSep[2];
tmpSep[0]=MenuSeparatorChar;
tmpSep[1]=0;
MenuAddItem(MENUITEM_exams, MENUITEM_addsep, 0, tmpSep);
}
if (TNPalmOSVersion() < 0x04000000) {
// No attention manager available, we do not work around that (yet?)
MenuHideItem(MENUITEM_alarm);
}
return true;
}
/* Palm OS does not have good dynamic menu support. About all you can do with
* the standard API calls is to add new items to an existing drop-down menu and
* hide/show items in a drop-down menu. It is impossible to add, hide, or
* change the label on a drop-down menu.
*
* The easiest and simplest way around this limitation is to modify the Palm OS
* MenuBarType structure directly. This gives limited ability to change the
* label on a drop-down menu. I have not been able to find a safe way to add,
* delete, or resize drop-down menus in OS 6.
*
* The following routine attempt to work around these limitations present in the
* Palm OS API to provide limited dynamic menu support. This solution is far
* from perfect, but the only other option is to wait for PalmSource to add full
* dynamic menu support, or to recreate the Palm OS menu system from scratch.
*
* This system is limited in that no more than 4 drop-down menus are allowed per
* menu bar, and the label for each drop-down menu is limited to 8 characters of
* text. However, this menu system should work for most applications.
*
* Basically the menu routines select one of four menu bars, depending on
* whether or not the requested menu bar has one, two, three, or four drop-down
* menus.
*
* These four "template" menu bars contain one, two, three, or four drop-down
* menus. Each menu has a dummy menu item attached to it to allow the Palm OS
* MenuAddItem function to add the real items.
*
* The labels on the drop-down menus are then replaced with the labels of the
* real menus.
*
* The menu is then attached to the active window and the MenuAddItem API
* function is called to add the items to each drop-down menu. Finally,
* MenuHideItem is called to remove the dummy items from each drop-down menu.
*/
void wxMenuBar::LoadMenu()
{
int i=0;
int j=0;
// Handle to the currently running application database
DmOpenRef AppDB;
// Get app database reference - needed for some Palm OS Menu API calls.
SysGetModuleDatabase(SysGetRefNum(), NULL, &AppDB);
// Get the number of menus
int NumMenus=GetMenuCount();
// Set up the pointers and handles
char *PalmOSMenuBarPtr;
MemHandle PalmOSMenuBar;
// Load the menu template and set up the menu pointers
if(NumMenus==1)
{
PalmOSMenuBar=DmGetResource(AppDB,'MBAR',1000);
PalmOSMenuBarPtr=(char *)MemHandleLock(PalmOSMenuBar);
PalmOSMenuBarPtr+=74;
}
else if(NumMenus==2)
{
PalmOSMenuBar=DmGetResource(AppDB,'MBAR',2000);
PalmOSMenuBarPtr=(char *)MemHandleLock(PalmOSMenuBar);
PalmOSMenuBarPtr+=116;
}
else if(NumMenus==3)
{
PalmOSMenuBar=DmGetResource(AppDB,'MBAR',3000);
PalmOSMenuBarPtr=(char *)MemHandleLock(PalmOSMenuBar);
PalmOSMenuBarPtr+=158;
}
else
{
// We support a maximum of 4 menus, so make sure that do not create
// more than we can handle.
NumMenus=4;
PalmOSMenuBar=DmGetResource(AppDB,'MBAR',4000);
PalmOSMenuBarPtr=(char *)MemHandleLock(PalmOSMenuBar);
PalmOSMenuBarPtr+=200;
}
// Set the proper names for the drop-down triggers.
for(i=0;i<NumMenus;i++)
{
// Clear out the old label
char buffer[8]={' ',' ',' ',' ',' ',' ',' ',' '};
MemMove(PalmOSMenuBarPtr,buffer,8);
wxString MenuTitle=m_titles.Item(i);
// Make sure we don't copy more than 8 bytes for the label
int LengthToCopy=MenuTitle.length();
if(LengthToCopy>8)
LengthToCopy=8;
MemMove(PalmOSMenuBarPtr,MenuTitle,LengthToCopy);
PalmOSMenuBarPtr+=11;
}
// We are done with the menu pointer.
MemHandleUnlock(PalmOSMenuBar);
DmReleaseResource(PalmOSMenuBar);
// We must make the menu active before we can add items to the drop-down
// triggers.
FrmSetMenu(FrmGetActiveForm(),AppDB,NumMenus*1000);
/* Add the menu items to the drop-down triggers. This must be done after
* setting the triggers, because setting the names of drop-down triggers
* that have a variable number of items requires carefull calculation of
* the offsets in the MenuBarType structure. Setting the triggers first
* avoids this.
*/
for(i=0;i<NumMenus;i++)
{
wxMenu *CurrentMenu=GetMenu(i);
for(j=0;j<CurrentMenu->GetMenuItemCount();j++)
{
wxMenuItem *CurrentItem=CurrentMenu->FindItemByPosition(j);
wxString ItemLabel=CurrentItem->GetLabel();
if(CurrentItem->IsSeparator()==true)
{
char Separator=MenuSeparatorChar;
if(j==0)
MenuAddItem(9000+i,((i*1000)+1000)+j,0x00,&Separator);
else
MenuAddItem(((i*1000)+1000)+j-1,((i*1000)+1000)+j,0x00,&Separator);
}
else
{
if(j==0)
MenuAddItem(9000+i,((i*1000)+1000)+j,0x00,ItemLabel);
else
MenuAddItem(((i*1000)+1000)+j-1,((i*1000)+1000)+j,0x00,ItemLabel);
}
}
// Hide the dummy menu item, since we don't need it anymore.
MenuHideItem(9000+i);
}
}
