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WPF MeasureOverride and ArrangeOverride

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问题 My question here is more of a theoretical one rather than functional. So what I'm looking for is an answer that can maybe be backed up with some documentation. I find myself in the situation where I need to do some custom measurements/arrangements for a wpf control's children? Is it ok to measure the children based on other size constraints rather than the one received as a parameter. Some pseudocode of what I'm trying to achieve: MeasureOverride(size) { foreach(child in children) { if

WPF MeasureOverride and ArrangeOverride

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MeasureOverride not always called on children's property changes

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问题 I wrote a panel similar to the built-in StackPanel. I works almost fine except for a slight problem: Changing layout properties on children do not always cause the panel's MeasureOverride and ArrangeOverride to be called. They are always called when a child's Visibility property changes, but not when the Width and Height properties change. I haven't yet managed to reproduce this behavior in a sample small enough to be appropriate for being included in a question on StackOverflow: But since it

Measure Control with double.PositiveInfinity WPF

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问题 I am working on a custom control that has a custom panel and inside the custom panel I have a small and simple MeasureOverride method that passes the size of double.PositiveInfinity to its children MeasureOverride method. The custom panel should take care of the layout and it should make children bigger or smaller depending on window size. If you have dealt with controls you should then know how wpf layout system works and that basically every child calls MeasureOverride which calls

Why is a ListBoxItem not calling MeasureOverride when its width is changed?

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问题 Ok, for illustrative purposes, below I created a subclass of ListBoxItem and a subclass of ListBox which uses it as its container by overriding both IsItemItsOwnContainerOverride and GetContainerForItemOverride . Now when the window first appears, as expected, MeasureOverride is called on every ListBoxItem (with Infinity,Infinity) followed by ArrangeOverride being called on every item. However, when resizing the ListBox , only ArrangeOverride is called on the ListBoxItem , not MeasureOverride

Why is a ListBoxItem not calling MeasureOverride when its width is changed?

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Ok, for illustrative purposes, below I created a subclass of ListBoxItem and a subclass of ListBox which uses it as its container by overriding both IsItemItsOwnContainerOverride and GetContainerForItemOverride . Now when the window first appears, as expected, MeasureOverride is called on every ListBoxItem (with Infinity,Infinity) followed by ArrangeOverride being called on every item. However, when resizing the ListBox , only ArrangeOverride is called on the ListBoxItem , not MeasureOverride even though the metadata for the width property is set to AffectsMeasure . NotE: I know I can get

Measure Control with double.PositiveInfinity WPF

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I am working on a custom control that has a custom panel and inside the custom panel I have a small and simple MeasureOverride method that passes the size of double.PositiveInfinity to its children MeasureOverride method. The custom panel should take care of the layout and it should make children bigger or smaller depending on window size. If you have dealt with controls you should then know how wpf layout system works and that basically every child calls MeasureOverride which calls MeasureOverride of childs children and so on. Now the problem is that when I resize the window, the custom panel