IMarkupPointer :: Right and IMarkupPointer :: Left 'notes document describes

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最新推荐文章于 2024-09-26 13:42:05 发布

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本文介绍了Markup Pointer接口中使用的MARKUP_CONTEXT_TYPE枚举类型，该类型定义了指针左右移动时遇到的不同内容类型，包括无内容、文本、元素开始标签和结束标签等。文章通过具体示例解释了如何使用IMarkupPointer::Left和IMarkupPointer::Right方法来确定指针周围的上下文。

MARKUP_CONTEXT_TYPE Enumerated Type
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An enumerated type that contains the different options for the IMarkupPointer :: Right and IMarkupPointer :: Left methods.

Syntax

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typedef enum {
CONTEXT_TYPE_None = 0,
CONTEXT_TYPE_Text = 1,
CONTEXT_TYPE_EnterScope = 2
CONTEXT_TYPE_ExitScope = 3,
CONTEXT_TYPE_NoScope = 4
} MARKUP_CONTEXT_TYPE;

Constants

CONTEXT_TYPE_None
There is no markup content next to the markup pointer in the specified direction.

CONTEXT_TYPE_Text
The markup content next to the markup pointer in the specified direction is text.

CONTEXT_TYPE_EnterScope

An element's opening tag is next to the markup pointer in the specified direction.

/ / Here CONTEXT_TYPE_EnterScope is markup pointer neighbor elements in the specified direction of opening tag, that <xx> (</ xx>) element, but that is not the case, CONTEXT_TYPE_EnterScope represented in a given direction, into <xx> ... </ xx> element or leave this element.

Example: <xx> | ... </ xx> (red vertical line represents markup pointer) to test if the left (Left function that is called):

HRESULT Left (BOOL fMove, MARKUP_CONTEXT_TYPE * pContext, IHTMLElement ** ppElement, long * pcch, OLECHAR * pchText);

Get to parameter pContext is CONTEXT_TYPE_ExitScope a Left is to promote markup the Pointer to leave <xx> ... </ xx> element. But

Markup pointer <xx> ... </ xx> | this position, then the Left function parameters pContext is CONTEXT_TYPE_EnterScope.

Conclusion: IMarkupPointer :: Right / Left function returns the pContext determined by their leave or enter the element node, rather than the current direction of movement of the neighbor is opening or closing tag.

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