how to Find child Widget from Parent Widget

Question

Hi.,

in my project i added Custom Widget inherit from QWidget class. the shape is Circle. i added this widget in to the parent Widget.

if the custom button clicked then how to find which button clicked?

Adding custom button to Parent Widget:

void ShotViewCTRL::addShot(QString shotNanme)
{
    ShotButton *btnShot=new ShotButton(this);
    btnShot->shotName=shotNanme;

    connect(btnShot,SIGNAL(Shot_Selected()),this,SLOT(SHOT_CLICKED()));
    btnShot->CreateButton();
    btnShot->show();

}

my parent widget is "ShotViewCTRL"(inherit from QWidget). child widget is "ShotButton" (custom control, inherit from Qwidget)

Control working fine. it's sending sending to parent object. in my problem i added same custom control 10 times.

i need to find which control is clicked? Please help me to find the solution.

i refered the Qt documentation to find the Child Widget, but i did't understand. please any one having some code sample that's great.

Answer 1

you specify different slots for different buttons with same signal.with that you can recognize the different button click

Answer 2

You can use the QObject::Sender function to find which QObject sends the signal. Regarding the first warning in the doc, it's what you are searching for.

Answer 3

QSignalMapper is whatyou are searching for. You can add with QSignalMapper something like an Id (or even the QButton Pointer itself) as additional data to the signal emittance and you have to adjust your slots so it takes additional data (ID or Pointer).

Then either distinguish in the slot itself by the id your give your objects some virtual function type() so you can distinguish with that or even trycasting and catch errors (Tip: don't try the last method, it may work differntly on different compiler).