parent-child

问题 I am working on Qt application. There I am creating layout and adding sublayout. I have seen that calling addLayout() sets as parent the container layout. Does that implies than when I delete superlayout its descendants will get deleted too? QWidget* centralWidget = new QWidget(this); QVBoxLayout *mainLayout = new QVBoxLayout(centralWidget); QFormLayout *formLayout = new QFormLayout; mainLayout->addLayout(formLayout); Will deleting centralWidget delete formLayout? Thanks and regards 回答1:

问题 I'm using the PageViewController (https://www.cocoacontrols.com/controls/pageviewcontroller) to create a Magazine App similar to Wired. I've used this code on CustomPagerViewController to load the childview's: - (IBAction)btn_index:(id)sender { NSInteger currentPage = 3; CGPoint offset = CGPointMake(currentPage * self.scrollView.frame.size.width, 0); [self.scrollView setContentOffset:offset animated:YES];} But I need several buttons on the indexviewcontroller to load the correct views and

问题 I have stuck in getting all children's query where parent id greater than the customer id table test id name parent 1 test1 0 2 test2 1 3 test3 1 4 test4 2 5 test5 2 6 test6 10 7 test7 10 8 test8 6 9 test9 6 10 test10 5 11 test10 7 Currently I am using this recursive query but it shows children till the 10 parent but not able to give children of 6 and 7 and further SELECT id , parent FROM (SELECT id , parent from (SELECT * FROM test order by parent , id) testdata_sorted, (SELECT @pv := '1')

问题 Is it possbile to restrict a Role in Dimension Data by allowing him to see only siblings in the parent-child Hierarchy? Example Hierarchy: EMEA 100 UK 50 London 30 Southampton 20 France 50 Paris 10 Lyon 40 To see only: EMEA 100 UK 50 France 50 回答1: I've received the expected result with the following MDX statement NONEMPTY( descendants( [Dim Branch Hierarchies].[Branch Hierarchy] ,,leaves ) , ( [Measures].[GrantedHi] ,StrtoMember( "([Dim Users].[Account Name].[Account Name].["+ Username()+ "]

问题 Is it possbile to restrict a Role in Dimension Data by allowing him to see only siblings in the parent-child Hierarchy? Example Hierarchy: EMEA 100 UK 50 London 30 Southampton 20 France 50 Paris 10 Lyon 40 To see only: EMEA 100 UK 50 France 50 回答1: I've received the expected result with the following MDX statement NONEMPTY( descendants( [Dim Branch Hierarchies].[Branch Hierarchy] ,,leaves ) , ( [Measures].[GrantedHi] ,StrtoMember( "([Dim Users].[Account Name].[Account Name].["+ Username()+ "]

问题 I know that this can be done in bash by: pstree parent-pid . But how can I do this in C ? Is there any method that doesn't have to iterating the whole /proc file system (e.g. system call/library function)? 回答1: you can use popen to read the output of the command ps -ef ,then look for the all the child process of a specified PID int getAllChildProcess(pid_t ppid) { char *buff = NULL; size_t len = 255; char command[256] = {0}; sprintf(command,"ps -ef|awk '$3==%u {print $2}'",ppid); FILE *fp =

问题 I'm attempting to have a Title and URL populate based off the parent child relationship. I've been able to work with other developers here on Stackoverflow (ref: Echo the subtitle of a PARENT page within WordPress - Part (2)) to mimic a similar function based off of data gathered from tables, however, this will be static information that is populated. What I need to be done: If you are on the Homepage or using the "Default" template for the page, the Title will be "Homepage" and the URL will

问题 I'm using an ExpandableListView to get an expandable list. I have 3 expandable "parent" lists: Price, Details, Notes. I want to be able to add unique child lists for each parent list. But the way its set up now, the same child list is being added for each parent list. How do I make it so I can add unique, separate child lists for Price, Details, and Notes? Here is my code: public class Assignment extends ExpandableListActivity { int listFlag = 0; @SuppressWarnings("unchecked") public void

问题 A new iOS ViewControllers created from a template contains several "boilerplate" methods that call their parent class methods. -(void) viewDidLoad { [super viewDidLoad]; } - (void) viewDidUnload { [super viewDidUnload]; } - (void) dealloc { [super dealloc]; } When modify these classes, should I put my own code before or after the parent class calls? - (void) viewDidLoad { // Should I put my code here? [super viewDidLoad]; // Or here? } 回答1: This is applicable for all OOP in general. In

问题 I want to call SingleCard child component methods in renderHiddenItem . I have assigned different ref name for each renderItem . But when I call this.name , it is undefined . Anything is wrong in this code? How can I achieve this? <SwipeListView data={this.state.listViewData} renderItem={(data, i) => { const name = 'childRef'+i return ( <SingleCard ref={component => this.name = component} itm={data.item} /> ); }} renderHiddenItem={(data, i) => { const name = 'childRef'+i return (