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Wrote code to draw the background of text.

This commit is contained in:
Pietro Gagliardi 2017-02-13 01:22:59 -05:00
parent 44f24fc900
commit b2cd5ef851
2 changed files with 39 additions and 0 deletions
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38
common/drawtext.c
View File

@ -49,3 +49,41 @@ void uiDrawCaret(uiDrawContext *c, double x, double y, uiDrawTextLayout *layout,
uiDrawRestore(c);
}
void drawTextBackground(uiDrawContext *c, double x, double y, uiDrawTextLayout *layout, size_t start, size_t end, uiDrawBrush *brush, int isSelection)
{
int line, nLines;
size_t lstart, lend;
double layoutwid, layoutht;
uiDrawTextLayoutExtents(layout, &layoutwid, &layoutht);
nLines = uiDrawTextLayoutNumLines(layout);
for (line = 0; line < nLines; line++) {
uiDrawTextLayoutLineByteRange(layout, line, &lstart, &lend);
if (start >= lstart && start < lend)
break;
}
while (end - start > 0) {
uiDrawTextLayoutLineMetrics m;
double startx, endx;
uiDrawPath *path;
if (lend > end) // don't cross lines
lend = end;
startx = uiDrawTextLayoutByteLocationInLine(layout, line, start);
// TODO explain this
endx = layoutwid;
if (!isSelection || end <= lend)
endx = uiDrawTextLayoutByteLocationInLine(layout, line, end);
uiDrawTextLayoutLineGetMetrics(layout, line, &m);
path = uiDrawNewPath(uiDrawFillModeWinding);
uiDrawPathAddRectangle(path,
x + startx, y + m.Y,
endx - startx, m.Height);
uiDrawPathEnd(path);
uiDrawFill(c, path, brush);
uiDrawFreePath(path);
line++;
start += lend - start;
}
}

1
common/uipriv.h
View File

@ -99,6 +99,7 @@ struct caretDrawParams {
double width;
};
extern void caretDrawParams(uiDrawContext *c, double height, struct caretDrawParams *p);
extern void drawTextBackground(uiDrawContext *c, double x, double y, uiDrawTextLayout *layout, size_t start, size_t end, uiDrawBrush *brush, int isSelection);
#ifdef __cplusplus
}