Calling a QMainWindow method in its instance class method

Question

I have a MainWindow class

class MainWindow : public QMainWindow
{
    customClass * obj;
public:
    void foo(bool);
}

Here is my customClass:

class customClass 
{
    void foo1(bool);
}

Now, I want to call foo() method in foo1().

How to do that?

score 1 · Answer 1 · answered Apr 22 '13 at 20:59

You can make the constructor of your customClass take a pointer to a MainWindow which it stores in a member variable for later use.

class customClass 
{
public:
  customClass(MainWindow* mainWindow)
  : mainWindow_(mainWindow)
  {
  }

  void foo1(bool b) {
    mainWindow_->foo(b);
  }

private:
  MainWindow* mainWindow_;
}

score 0 · Answer 2 · answered Apr 22 '13 at 17:37

0

One of way - using of dependency injection pattern: link

struct A;
struct B
{
  B( A& a );

void foo1()
{
  m_a.foo();
}

private:
  A& m_a;
}

struct A
{
  void foo(){}
  B m_b;
}

answered Apr 22 '13 at 17:37

Dmitry Sazonov

8,801
1
35
61

can't it be simple, for a beginner? – shivshnkr Apr 22 '13 at 17:39
It's simple as much, as it can be. You should pass a pointer or a reference of class MainWindow to a constructor of class customClass and save in in some member. Then you may use it. – Dmitry Sazonov Apr 22 '13 at 17:50

score 0 · Answer 3 · answered Apr 22 '13 at 17:53

0

You can make your MainWindow implements singleton pattern (if it's applicable to your design), then you can directly get an instance from any place you like.

answered Apr 22 '13 at 17:53

evilruff

3,947
1
15
27

Calling a QMainWindow method in its instance class method

3 Answers3