sizeHint()

[sm]

Great!
I was able to implement sizeHint like you suggested without the compiler complaining about it (for the first time). If I want to resize the main window, do I just do this?

adjustSize();

adjustSize();

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or

QSize sizeHint();
adjustSize();

QSize sizeHint();
adjustSize();

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Both of these only work abot half the time.
My question is how does another function that uses sizeHint() actually know to invoke the sizeHint() function? How do you call sizeHint() when you want to use it for adjustSize()?

[jpn]

QSize sizeHint();
adjustSize();

QSize sizeHint();
adjustSize();

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The first one is not a valid C++ statement. It shouldn't even compile.

From QWidget::adjustSize() docs:

Adjusts the size of the widget to fit the contents.

Uses sizeHint() if valid (i.e if the size hint's width and height are >= 0); otherwise sets the size to the children rectangle that covers all child widgets (the union of all child widget rectangles). For top-level widgets, the screen size is also taken into account.

As it says, adjustSize() will use the value returned by sizeHint().

Edit: PS. Oh, actually it is a valid C++ statement. It just constructs a variable of type QSize called sizeHint. However, it won't call that function.

[sm]

For some reason both of the versions compiled. I am now only using the version that you suggested (the second version). But even this only works but only half the time. I understand that sizeHint() + adjustSize() are only executed when they are possible (the size is meaningful) but in my case they don't work when it should be very easy to do what's asked. I know it's very difficult for anyone to trouble-shoot my code without seeing it. So I have to figure it out myself. In order to do this I'd like to know the following:
a) do you have to put the adjustSize() in in the end of the drawing functions (only execute it after everything else has been done)?
b) is it OK to put adjustSize() in any function (other than main function)
c) how do the addStretch commands in they layout constructor affect adjustSize? is it possible that addStretch functions make adjustSize somewhat nonfunctional because they tend to expand the layout (while I try to use adjustSize to contract it).

[wysota]

"QSize sizeHint();" probably compiles as a "declaration of a local function sizeHint() returning QSize".

[Gopala Krishna]

It would be nice if you could post some code.
BTW sizeHint is used by layouts mainly and if you are using layout then it is enough to just reimplement sizeHint() as suggested. The rest is taken care by the layout.