Tutorial 13: Display Filters | ||||||||||||
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What are Display Filters? |
Display filters modify the way in which articles are displayed in the
group window's article view area. The original article is not modified in
any way, only its presentation is affected. Display filters might do
things such as trim excess quoted text, colorize various aspects of an
article, hide unwanted header fields, and so on. It's possible to make
display filters group specific, or to apply them to any subset of groups,
such as "comp.*". Display filters can also modify text streams when saving articles to disk files, printing article text, or generating replies to other people's articles. For example, a filter might remove a large UUencoded block of data in a post that you are replying to. This section of the documentation discusses general display filter topics. The specifics of each different type of filter are covered in the reference section of this documentation. |
Filter Scope |
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Adding and Deleting Filters |
In each filter list there is an Add button that, when pressed, will
display a popup list of available filters. Filters are plug-ins,
so the list may change depending on which filters are currently
installed. The popup filter list looks like this:
A filter may be added by double clicking on it's name in the popup list. You may insert multiple filters at once by drag-selecting several and clicking the Insert Selected button. The list may be closed without adding a filter by clicking the Close button. Removing filters is a simple matter of selecting those to be removed and using the Delete button. |
Editing Filters |
Each filter provides a user interface for customizing its operation. For
example, a quoted text hilighting filter might let you chose the font and
color for text of different quoted indent levels, while a header hiding
filter might let you specify a pattern indicating which headers to hide
and which to show. The user interface for any filter may be called up by either double clicking on the name of the filter in the filter list, or by using the Edit button. The user interface for each filter is described in detail in the reference section of this documentation. |
Common Filter Features |
Certain information is available in every type of display filter.
Calling up the editor for a particular filter reveals three main click
tabs:
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Global Info |
The global info area looks like this:
The following features are available here:
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Author Notes | The use of the Author Note field is the same as in Selection Filters. Please see that documentation for more details. |
Saving & Loading Filters | Display filters can be saved and loaded in a manner identical to Selection Filters. Please see that documentation for more details. |
Summary |
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