93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
// 10 february 2017
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#include "../ui.h"
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#include "uipriv.h"
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// TODO this doesn't handle the case where nLines == 0
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// TODO this should never happen even if there are no characters??
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// TODO figure out how to make this work on GTK+
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void uiDrawCaret(uiDrawContext *c, double x, double y, uiDrawTextLayout *layout, size_t pos, int *line)
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{
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double xoff;
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uiDrawTextLayoutLineMetrics m;
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struct caretDrawParams cdp;
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uiDrawPath *path;
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uiDrawBrush brush;
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if (*line < 0)
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*line = 0;
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if (*line > (uiDrawTextLayoutNumLines(layout) - 1))
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*line = (uiDrawTextLayoutNumLines(layout) - 1);
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// TODO cap pos
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xoff = uiDrawTextLayoutByteLocationInLine(layout, pos, *line);
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while (xoff < 0) {
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size_t start, end;
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uiDrawTextLayoutLineByteRange(layout, *line, &start, &end);
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if (end < pos) // too far up
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(*line)++;
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else
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(*line)--;
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xoff = uiDrawTextLayoutByteLocationInLine(layout, pos, *line);
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}
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uiDrawTextLayoutLineGetMetrics(layout, *line, &m);
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caretDrawParams(c, m.Height, &cdp);
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uiDrawSave(c);
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path = uiDrawNewPath(uiDrawFillModeWinding);
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uiDrawPathAddRectangle(path,
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// TODO add m.X?
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x + xoff - cdp.xoff, y + m.Y,
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cdp.width, m.Height);
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uiDrawPathEnd(path);
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brush.Type = uiDrawBrushTypeSolid;
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brush.R = cdp.r;
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brush.G = cdp.g;
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brush.B = cdp.b;
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brush.A = cdp.a;
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uiDrawFill(c, path, &brush);
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uiDrawFreePath(path);
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uiDrawRestore(c);
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}
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void drawTextBackground(uiDrawContext *c, double x, double y, uiDrawTextLayout *layout, size_t start, size_t end, uiDrawBrush *brush, int isSelection)
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{
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int line, nLines;
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size_t lstart, lend;
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double layoutwid, layoutht;
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uiDrawTextLayoutExtents(layout, &layoutwid, &layoutht);
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nLines = uiDrawTextLayoutNumLines(layout);
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for (line = 0; line < nLines; line++) {
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uiDrawTextLayoutLineByteRange(layout, line, &lstart, &lend);
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if (start >= lstart && start < lend)
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break;
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}
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while (end - start > 0) {
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uiDrawTextLayoutLineMetrics m;
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double startx, endx;
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uiDrawPath *path;
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uiDrawTextLayoutLineByteRange(layout, line, &lstart, &lend);
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if (lend > end) // don't cross lines
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lend = end;
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startx = uiDrawTextLayoutByteLocationInLine(layout, start, line);
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// TODO explain this; note the use of start with lend
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endx = layoutwid;
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if (!isSelection || end <= lend)
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endx = uiDrawTextLayoutByteLocationInLine(layout, lend, line);
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uiDrawTextLayoutLineGetMetrics(layout, line, &m);
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path = uiDrawNewPath(uiDrawFillModeWinding);
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uiDrawPathAddRectangle(path,
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x + startx, y + m.Y,
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endx - startx, m.Height);
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uiDrawPathEnd(path);
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uiDrawFill(c, path, brush);
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uiDrawFreePath(path);
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line++;
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start = lend;
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}
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}
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