Xlib â C Language X Interface

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<strong>Xlib</strong> − C LibraryX11, Release 6.7 DRAFTText: A BCDEˆˆˆˆˆˆCharPos: 0 12345The CharPos in the diagram shows the location of the character position relative to thecharacter.If the value of chg_first is 1 and the value of chg_length is 3, this says to replace 3 charactersbeginning at character position 1 with the string in the XIMText structure. Hence,BCD would be replaced by the value in the structure.Though chg_length and chg_first are both signed integers they will never have aneg ativevalue.• The caret member identifies the character position before which the cursor should be placed−after modification to the preedit buffer has been completed. For example, if caret is zero,the cursor is at the beginning of the buffer. Ifthe caret is one, the cursor is between the firstand second character.typedef struct _XIMText {unsigned short length;XIMFeedback * feedback;Bool encoding_is_wchar;union {char * multi_byte;wchar_t * wide_char;}string;}XIMText;The text string passed is actually a structure specifying as follows:• The length member is the text length in characters.• The encoding_is_wchar member is a value that indicates if the text string is encoded inwide character or multibyte format. The text string may be passed either as multibyte or aswide character; the input method controls in which form data is passed. The client’s callbackroutine must be able to handle data passed in either form.• The string member is the text string.• The feedback member indicates rendering type for each character in the string member. Ifstring is NULL (indicating that only highlighting of the existing preedit buffer should beupdated), feedback points to length highlight elements that should be applied to the existingpreedit buffer, beginning at chg_first.The feedback member expresses the types of rendering feedback the callback should apply whendrawing text. Rendering of the text to be drawn is specified either in generic ways (for example,primary, secondary) or in specific ways (reverse, underline). When generic indications are given,the client is free to choose the rendering style. It is necessary, however, that primary and secondarybe mapped to two distinct rendering styles.If an input method wants to control display of the preedit string, an input method can indicate thevisibility hints using feedbacks in a specific way. The XIMVisibleToForward, XIMVisibleTo-Backward, and XIMVisibleCenter masks are exclusively used for these visibility hints. TheXIMVisibleToForward mask indicates that the preedit text is preferably displayed in the335
<strong>Xlib</strong> − C LibraryX11, Release 6.7 DRAFTprimary draw direction from the caret position in the preedit area forward. The XIMVisibleTo-Backward mask indicates that the preedit text is preferably displayed from the caret position inthe preedit area backward, relative to the primary draw direction. The XIMVisibleCenter maskindicates that the preedit text is preferably displayed with the caret position in the preedit areacentered.The insertion point of the preedit string could exist outside of the visible area when visibility hintsare used. Only one of the masks is valid for the entire preedit string, and only one character canhold one of these feedbacks for a given input context at one time. This feedback may be OR’edtogether with another highlight (such as XIMReverse). Only the most recently set feedback isvalid, and any previous feedback is automatically canceled. This is a hint to the client, and theclient is free to choose how todisplay the preedit string.The feedback member also specifies how rendering of the text argument should be performed. Ifthe feedback is NULL, the callback should apply the same feedback as is used for the surroundingcharacters in the preedit buffer; if chg_first is at a highlight boundary, the client can choosewhich of the two highlights to use. If feedback is not NULL, feedback specifies an array definingthe rendering for each character of the string, and the length of the array is thus length.If an input method wants to indicate that it is only updating the feedback of the preedit text withoutchanging the content of it, the XIMText structure will contain a NULL value for the stringfield, the number of characters affected (relative to chg_first) will be in the length field, and thefeedback field will point to an array of XIMFeedback.Each element in the feedback array is a bitmask represented by a value of type XIMFeedback.The valid mask names are as follows:typedef unsigned long XIMFeedback;#define XIMReverse 1L#define XIMUnderline (1L
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AcknowledgmentsThe design and imple
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Release 6Stephen Gildea (X Consorti
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Xlib − C LibraryX11, Release 6.7
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4.2. Translating Screen Coordinates
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10.7. Input Focus Events . . . . .
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13.5.6.1. Input Style . . . . . . .
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