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How do I set the QComboBox width to fit the largest item?

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I have a QComboBox that I fill with QString using:

comboBox->addItem(someString); 

When I start my GUI application the width of the QComboBox is always 70, even if the smallest item is much larger. How can I dynamically set the width of a QComboBox, for instance, to the largest QString within the comboBox?

Edit:

After some further testing I found the following solution:

// get the minimum width that fits the largest item. int width = ui->sieveSizeComboBox->minimumSizeHint().width(); // set the ComboBoxe to that width. ui->sieveSizeComboBox->setMinimumWidth(width); 
like image 606
Linoliumz Avatar asked Jun 30 '10 17:06

Linoliumz


2 Answers

Qt (4.6) online documentation has this to say about QComboBox:

enum    SizeAdjustPolicy  { AdjustToContents, AdjustToContentsOnFirstShow, AdjustToMinimumContentsLength, AdjustToMinimumContentsLengthWithIcon } 

I would suggest

  1. ensuring the SizeAdjustPolicy is actually being used

  2. setting the enum to AdjustToContents. As you mention a .ui file I suggest doing that in Designer. Normally there shouldn't be anything fancy in your constructor at all concerning things you do in Designer.

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rubenvb Avatar answered Sep 28 '22 10:09

rubenvb


According to the docs the default SizeAdjustPolicy is AdjustToContentsOnFirstShow so perhaps you are showing it and then populating it?

Either populate it first before showing it or try setting the policy to QComboBox::AdjustToContents.

Edit:

BTW I'm assuming that you have the QComboBox in a suitable layout, eg. QHBoxLayout, so that the size hint/policy is actually being used.

like image 33
Troubadour Avatar answered Sep 28 '22 10:09

Troubadour