CODEWITHSUNDEEP
wpfvisual-studiocontrolssize
tranmq
tranmq

Reputation: 15658

How does Visual Studio set sizes for WPF controls?

In visual studio, when dragging a control from the toolbox onto the design area, VS automatic sets width and height of the control with some values. Do you know how it does it? I was suspicious that there were some kind of attributes for the Width and Height properties or even the class itself but could not find anything from reflecting the Button control.

Upvotes: 2

Views: 138

Answers (2)

HolisticElastic
HolisticElastic

Reputation: 967

Actually, there is no any magic, the VS would need to do to acquire those defaults. My guess, it allows all layout passes to finish and then simply copies values of ActualWidth and ActualHeight properties.

Google a little on the purpose of MeasureOverride and ArrangeOverride methods, layout passes, etcetera.

Have in mind, that actual default values for dependency properties are specified by their metadata either along with their registration or by means of overriding it in subclasses. I believe, that actual default value for either of Width and Height properties is the double.NaN value.

Upvotes: 1

Aran Mulholland
Aran Mulholland

Reputation: 23935

I haven't found it using reflector yet, at least not in the Button class. When i add a button using xaml, it will take up the available space given to it. when i add one using the designer, its height gets set at 23.

this article describes creating a control with default values for use in the toolbox, i would assume that the toolbox items are done the same way.

Upvotes: 0

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