영어에서 Logical tree 을 사용하는 예와 한국어로 번역
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Diagram of logical tree.
The DOM model represents a document with a logical tree.
Diagram of logical tree.
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For instance, the logical tree reports the Text value of a TextBlock, which is a string.
Overriding the Logical Tree.
In most cases, the logical tree is a more useful representation of the elements in a WPF application.
Composition of the Logical Tree.
The logical tree is used for resource lookup when both the logical tree and the visual tree are present.
The Purpose of the Logical Tree.
Advanced control authors can override the logical tree by overriding several APIs that define how a general object or content model adds or removes objects within the logical tree.
However, resource lookup can also extend beyond the immediate logical tree.
In addition to the concept of the logical tree, there is also the concept of the visual tree in WPF.
The LogicalTreeHelper class provides the GetChildren,GetParent, and FindLogicalNode methods for logical tree traversal.
Also, the logical tree provides a framework for certain notifications, such as when all objects in the logical tree are loaded.
Themes themselves can also reference system values outside of the theme logical tree if the resource references are dynamic.
This topic defines what the visual tree and logical tree represent, discusses how such trees relate to an overall object tree concept, and introduces LogicalTreeHelper and VisualTreeHelpers.
In order to appear in a UI at all, a ContentElement must be hosted in a content host that is both a Visual and a logical tree participant.
Both the visual tree and logical tree are synchronized with the current set of application elements, reflecting any addition, deletion, or modification of elements.
This example of processing XAML into an object tree is so far seemingly an example where the created object tree is basically the logical tree.
Objects that are not in the logical tree can reference keyed resources, but the resource lookup sequence begins at the point where that object is connected to the logical tree.
However, for existing WPF properties that support property inheritance, property value inheritance is able to perpetuate through an intervening object that is not in the logical tree.
However, as you can see if you actually use the LogicalTreeHelper API, the logical tree sometimes contains nodes that are not either FrameworkElement or FrameworkContentElement.
As mentioned before, the route of any given routed event travels along a single and predetermined path of a tree that is a hybrid of the visual and logical tree representations.
The terms visual tree and logical tree are also used in the WPF documentation because these same trees are useful for understanding the behavior of certain key WPF features.
Therefore, both the parent that holds the original value and the child object that inherits thatvalue must both be FrameworkElement or FrameworkContentElement, and they must both be part of some logical tree.
Basically, the logical tree is an approximation of a run time object graph at the framework level, which excludes visuals, but is adequate for many querying operations against your own run time application's composition.
In Windows Presentation Foundation(WPF), there are two ways that the complete objecttree is conceptualized and can be reported to its public API: as the logical tree and as the visual tree. .
In WPF, only logical tree nodes can have a Resources property that contains a ResourceDictionary, therefore there is no benefit in traversing the visual tree looking for keyed resources from a ResourceDictionary.