logical-tree | 易学教程

Concepts of Visual tree and Logical tree [closed]

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问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 6 months ago . I understand the concepts of Visual and logical tree but still I am not able to understand the real use and need of these. Although its not necessary to know everything about these trees but I believe it will benefit in some advanced scenarios. I have already gone through

Why does binding fail when binding a child element to another element when the parent succeeds?

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问题 Say I have two classes that can reference a third UI object (in this example a button). In addition, the parent class can contain an element of the child class. If they both are bound to the same control, the same way, the child will fail but the parent succeed. Is this a bug in WPF? The parent : class MyFrameworkElement : FrameworkElement { // A depenedency property that will contain a child element sub-element private static readonly DependencyProperty ChildElementProperty =

Algorithm for evaluating nested logical expression

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问题 I have a logical expression that I would like to evaluate. The expression can be nested and consists of T (True) or F (False) and parenthesis. The parenthesis "(" means "logical OR". Two terms TF beside each others (or any other two combinations beside each others), should be ANDED (Logical AND). For example, the expression: ((TFT)T) = true I need an algorithm for solving this problem. I thought of converting the expression first to disjunctive or conjunctive normal form and then I can easily

Why does binding fail when binding a child element to another element when the parent succeeds?

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Say I have two classes that can reference a third UI object (in this example a button). In addition, the parent class can contain an element of the child class. If they both are bound to the same control, the same way, the child will fail but the parent succeed. Is this a bug in WPF? The parent : class MyFrameworkElement : FrameworkElement { // A depenedency property that will contain a child element sub-element private static readonly DependencyProperty ChildElementProperty = DependencyProperty.Register("ChildElement", typeof(MyChildElement), typeof(MyFrameworkElement), new PropertyMetadata()

Disconnecting an element from any/unspecified parent container in WPF

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I have a control that is a child of another control (as all non-root controls/elemts are in WPF). If I want to move the control to another container I have to disconnect it from its current container first (otherwise an exception is thrown). If I know what the parent is then I can just remove it from its Children collection, or Content or whatever. But what if I don't know what the parent container's type is - how do I remove the child control then? In the code sample below: How would I be able to move "sp1" to another container without knowing the type of the parent (Panel, GroupBox...)? //

Binding ElementName. Does it use Visual Tree or Logical Tree

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Having {Binding ElementName=foo} , will it lookup visual or logical tree? Of logical and visual trees in WPF | Data See, Data Do When does the logical tree matter? When looking up a name, such as in {Binding ElementName=Foo}, the search walks up the ancestry looking for a name scope, again just as it does for inheritable properties. ElementName binding in Silverlight via Attached Behaviours In order to enable this, WPF provides ElementName and RelativeSource bindings, giving you a powerful mechanism for locating other elements within your visual tree to bind to EDIT: It looks like the Logical

Disconnecting an element from any/unspecified parent container in WPF

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问题 I have a control that is a child of another control (as all non-root controls/elemts are in WPF). If I want to move the control to another container I have to disconnect it from its current container first (otherwise an exception is thrown). If I know what the parent is then I can just remove it from its Children collection, or Content or whatever. But what if I don't know what the parent container's type is - how do I remove the child control then? In the code sample below: How would I be

Binding ElementName. Does it use Visual Tree or Logical Tree

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问题 Having {Binding ElementName=foo} , will it lookup visual or logical tree? Of logical and visual trees in WPF | Data See, Data Do When does the logical tree matter? When looking up a name, such as in {Binding ElementName=Foo}, the search walks up the ancestry looking for a name scope, again just as it does for inheritable properties. ElementName binding in Silverlight via Attached Behaviours In order to enable this, WPF provides ElementName and RelativeSource bindings, giving you a powerful