我正在使用setView:
方法设置自定义视图的NSMenuItem
。在这个自定义视图中,有一个图片占据了整个视图。这个带有自定义视图的NSMenuItem
是菜单中的第一个,但问题是它与菜单顶部不对齐,存在一个大的空白间隙,如下所示:
为什么会出现这种情况,我应该如何解决?
编辑
我现在正在使用这段代码,但在InstallControlEventHandler
一行上我遇到了EXC_BAD_ACCESS
错误。
-(void)applicationDidFinishLaunching:(NSNotification *)aNotification {
HIViewRef contentView;
MenuRef menuRef = [statusMenu carbonMenuRef];
HIMenuGetContentView(menuRef, kThemeMenuTypePullDown, &contentView);
EventTypeSpec hsEventSpec[1] = {
{ kEventClassMenu, kEventMenuCreateFrameView }
};
InstallControlEventHandler(contentView,
NewEventHandlerUPP((EventHandlerProcPtr)hsMenuCreationEventHandler),
GetEventTypeCount(hsEventSpec),
hsEventSpec,
NULL,
NULL); // Get EXC_BAD_ACCESS here.
}
static OSStatus hsMenuContentEventHandler( EventHandlerCallRef caller, EventRef event, void* refcon )
{
OSStatus err;
check( GetEventClass( event ) == kEventClassControl );
check( GetEventKind( event ) == kEventControlGetFrameMetrics );
err = CallNextEventHandler( caller, event );
if ( err == noErr )
{
HIViewFrameMetrics metrics;
verify_noerr( GetEventParameter( event, kEventParamControlFrameMetrics, typeControlFrameMetrics, NULL,
sizeof( metrics ), NULL, &metrics ) );
metrics.top = 0;
verify_noerr( SetEventParameter( event, kEventParamControlFrameMetrics, typeControlFrameMetrics,
sizeof( metrics ), &metrics ) );
}
return err;
}
static OSStatus hsMenuCreationEventHandler( EventHandlerCallRef caller, EventRef event, void* refcon )
{
OSStatus err = eventNotHandledErr;
if ( GetEventKind( event ) == kEventMenuCreateFrameView)
{
err = CallNextEventHandler( caller, event );
if ( err == noErr )
{
static const EventTypeSpec kContentEvents[] =
{
{ kEventClassControl, kEventControlGetFrameMetrics }
};
HIViewRef frame;
HIViewRef content;
verify_noerr( GetEventParameter( event, kEventParamMenuFrameView, typeControlRef, NULL,
sizeof( frame ), NULL, &frame ) );
verify_noerr( HIViewFindByID( frame, kHIViewWindowContentID, &content ) );
InstallControlEventHandler( content, hsMenuContentEventHandler, GetEventTypeCount( kContentEvents ),
kContentEvents, 0, NULL );
}
}
return err;
}
还要注意这一行代码metrics.top = 0
可以消除顶部的间隙。但是我在这一步无法正常工作。有人知道为什么会出现EXC_BAD_ACCESS
吗?我已经创建并分配了statusMenu
,所以它应该可以正常工作才对?