Layout issue

SPlatten

@JonB, what is a stretch? I don't see it in the side bar, under which group should I find that?

JonB

@SPlatten
I don't run Designer but it's there on the toolbar. Horizontal & vertical stretchers. They look like blue stretches when you place them. They should end up generating

vertLayout.addStretch()

I think/assume. void QBoxLayout::addStretch(int stretch = 0).

Pl45m4

@JonB

Spacers not stretch :)
Stretch is the stretch factor to stretch a layout item over multiple layout "slots"

JonB

@Pl45m4
I have written what I thought it was. I thought spacers were fixed size. Anyway whichever you say! It's some blue thing in Designer :) The link I gave for addStretch() states:

Adds a stretchable space (a QSpacerItem) with zero minimum size and stretch factor stretch to the end of this box layout.

Isn't that it?

SPlatten

@JonB I'm running version 5.9.2 of Qt Designer, there is no stretchers...Spacers there is thank you @Pl45m4 , but I don't want to spacer things out stretch is the correct terminology just don't see it.

I have now modified the source adding a call to:

mpui->pvtloMain->addStretch(1);

Ok, now with this its different, the whilespace between the QHBoxLayout layout and QGridLayout is now gone and when resizing the grid layout moves with the window, unlike before when it stayed anchored to the bottom, however its still not right because its not "stretching" the content, instead is moves up the window with space under the layout not occupied.

Just to be absolutely clear I don't want space, I want the content of the QGridLayout to resize as the container is dragged. In the same way it already does when dragging out horizontally.

JonB

@SPlatten said in Layout issue:

Just to be absolutely clear I don't want space, I want the content of the QGridLayout to resize as the container is dragged.

I had no idea that was what you wanted. That's why I asked each time.

So I think you need to set the grid layout (as a whole, not an individual row) to occupy as much height as possible. Now is that what you want?

SPlatten

@JonB , ok, please elaborate, its sounds like thats what I need, how do I do that?

JonB

@SPlatten
Dunno, I just play till I get what I want :) At least we finally seem to be agreeing about what that is!

Don't you have to set the grid in the vertical layout to expand its height as much as possible?

Is QBoxLayout::addLayout(QLayout *layout, int stretch = 0) what is wanted? With a non-0 stretch.

Otherwise maybe @Pl45m4 can state what is wanted here?

J.Hilk

@SPlatten

assuming:

MainWindow              QMainWindow
  pvtloMain             QVBoxLayout
    phzloTop            QHBoxLayout
      cboTraineeToView  QComboBox
      lblTtoV           QLabel
      pbtnAdmin         QPushButton
      pbtnBeginSession  QPushButton
      pbtnEndSession    QPushButton
      pbtnSearch        QPushButton
    pgrdloContent       QGridLayout

pvtloMain->setStretch(0, 0);
pvtloMain->setStretch(1, 1);

that makes phzloTop take up as little space as possible and pgrdloContent as much as possible

SPlatten

@J-Hilk , I've removed both of those lines and the result is the same, they did nothing.

SPlatten

@JonB The QGridLayout is added to the QVBoxLayout in the designer, I cannot set the layoutRowStretch property, trying to set it to 1, it goes right back to 0 after I press enter.

JonB

@SPlatten
My last attempt, because I'm going out, and someone who knows designer better than me can doubtless say.

The stretch needs to be set on the layout items added to the enclosing vboxlayout. That (the vboxlayout) has stretch factors doesn't it, or not? Temporarily put a stretch of 1 for its first first item, the hbox, and a stretch of 100 for its second item, the gridlayout? That's probably not fully right but does it do what you want? Else I don't know which way to do it.

J.Hilk

@SPlatten than they layouts or widgets are otherwise constraint

did you set max height of the Gridlayout ? or the sizepolicy to fixed ?

because a default arrangement works as intended:

JonB

@J-Hilk
Thank you for rescuing me here! I leave you to deal further with the question ;-)

SPlatten

@JonB, the QVboxLayout has the property layoutStretch with I've changed from 0,0 to 1,100.

Thats the puzzle solved! It works perfectly, thank you for your help and support.