72 lines
3.3 KiB
C
72 lines
3.3 KiB
C
|
|
typedef struct uiDrawTextLayoutLineMetrics uiDrawTextLayoutLineMetrics;
|
|
|
|
// Height will equal ParagraphSpacingBefore + LineHeightSpace + Ascent + Descent + Leading + LineSpacing + ParagraphSpacing.
|
|
// The above values are listed in vertical order, from top to bottom.
|
|
// Ascent + Descent + Leading will give you the typographic bounds
|
|
// of the text. BaselineY is the boundary between Ascent and Descent.
|
|
// X, Y, and BaselineY are all in the layout's coordinate system, so the
|
|
// start point of the baseline will be at (X, BaselineY). All values are
|
|
// nonnegative.
|
|
struct uiDrawTextLayoutLineMetrics {
|
|
// This describes the overall bounding box of the line.
|
|
double X;
|
|
double Y;
|
|
double Width;
|
|
double Height;
|
|
|
|
// This describes the typographic bounds of the line.
|
|
double BaselineY;
|
|
double Ascent;
|
|
double Descent;
|
|
double Leading;
|
|
|
|
// This describes any additional whitespace.
|
|
// TODO come up with better names for these.
|
|
double ParagraphSpacingBefore;
|
|
double LineHeightSpace;
|
|
double LineSpacing;
|
|
double ParagraphSpacing;
|
|
|
|
// TODO trailing whitespace?
|
|
};
|
|
|
|
_UI_EXTERN void uiDrawTextLayoutLineGetMetrics(uiDrawTextLayout *tl, int line, uiDrawTextLayoutLineMetrics *m);
|
|
|
|
// TODO rewrite this documentation
|
|
|
|
// uiDrawTextLayoutHitTest() returns the byte offset and line closest
|
|
// to the given point. The point is relative to the top-left of the layout.
|
|
// If the point is outside the layout itself, the closest point is chosen;
|
|
// this allows the function to be used for cursor positioning with the
|
|
// mouse. Do keep the returned line in mind if used in this way; the
|
|
// user might click on the end of a line, at which point the cursor
|
|
// might be at the trailing edge of the last grapheme on the line
|
|
// (subject to the operating system's APIs).
|
|
_UI_EXTERN void uiDrawTextLayoutHitTest(uiDrawTextLayout *tl, double x, double y, size_t *pos, int *line);
|
|
|
|
// uiDrawTextLayoutByteLocationInLine() returns the point offset
|
|
// into the given line that the given byte position stands. This is
|
|
// relative to the line's X position (as returned by
|
|
// uiDrawTextLayoutLineGetMetrics()), which in turn is relative to
|
|
// the top-left of the layout. This function can be used for cursor
|
|
// positioning: if start and end are the start and end of the line
|
|
// (as returned by uiDrawTextLayoutLineByteRange()), you will get
|
|
// the correct offset, even if pos is at the end of the line. If pos is not
|
|
// in the range [start, end], a negative value will be returned,
|
|
// indicating you need to move the cursor to another line.
|
|
// TODO make sure this works right for right-aligned and center-aligned lines and justified lines and RTL text
|
|
_UI_EXTERN double uiDrawTextLayoutByteLocationInLine(uiDrawTextLayout *tl, size_t pos, int line);
|
|
|
|
_UI_EXTERN void uiDrawCaret(uiDrawContext *c, double x, double y, uiDrawTextLayout *layout, size_t pos, int *line);
|
|
// TODO allow blinking
|
|
// TODO allow secondary carets
|
|
|
|
typedef struct uiFontButton uiFontButton;
|
|
#define uiFontButton(this) ((uiFontButton *) (this))
|
|
// TODO have a function that sets an entire font descriptor to a range in a uiAttributedString at once, for SetFont?
|
|
_UI_EXTERN void uiFontButtonFont(uiFontButton *b, uiDrawFontDescriptor *desc);
|
|
// TOOD SetFont, mechanics
|
|
_UI_EXTERN void uiFontButtonOnChanged(uiFontButton *b, void (*f)(uiFontButton *, void *), void *data);
|
|
_UI_EXTERN uiFontButton *uiNewFontButton(void);
|