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And implemented the functions on Windows. Yeah I think I'll need cursor functions, perhaps.

This commit is contained in:
Pietro Gagliardi 2017-02-06 18:38:44 -05:00
parent 3d8bf01972
commit e4ed1c337b
2 changed files with 98 additions and 8 deletions
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6
examples/drawtext/hittest.c
View File

@ -160,8 +160,10 @@ static void mouse(uiAreaMouseEvent *e)
&res);
uiDrawFreeTextLayout(layout);
sprintf(labelText, "pos %zd line %d x position %s y position %s",
res.Pos, res.Line,
// urgh %zd is not supported by MSVC with sprintf()
// TODO get that part in test/ about having no other option
sprintf(labelText, "pos %d line %d x position %s y position %s",
(int) (res.Pos), res.Line,
positions[res.XPosition],
positions[res.YPosition]);
uiLabelSetText(caretLabel, labelText);

100
windows/drawtext.cpp
View File

@ -5,15 +5,18 @@
// TODO
// - consider the warnings about antialiasing in the PadWrite sample
// - if that's not a problem, do we have overlapping rects in the hittest sample? I can't tell...
// - what happens if any nLines == 0?
struct uiDrawTextLayout {
IDWriteTextFormat *format;
IDWriteTextLayout *layout;
UINT32 nLines;
struct lineInfo *lineInfo;
// for converting DirectWrite indices to byte offsets
// for converting DirectWrite indices from/to byte offsets
size_t *u8tou16;
size_t nUTF8;
size_t *u16tou8;
size_t nu16tou8; // TODO I don't like the casing of this name; is it even necessary?
size_t nUTF16;
};
// TODO copy notes about DirectWrite DIPs being equal to Direct2D DIPs here
@ -43,7 +46,7 @@ static std::map<uiDrawTextStretch, DWRITE_FONT_STRETCH> dwriteStretches = {
};
struct lineInfo {
size_t startPos;
size_t startPos; // in UTF-16 points
size_t endPos;
size_t newlineCount;
double x;
@ -182,8 +185,9 @@ uiDrawTextLayout *uiDrawNewTextLayout(uiAttributedString *s, uiDrawFontDescripto
computeLineInfo(tl);
// and finally copy the UTF-16 to UTF-8 index conversion table
tl->u16tou8 = attrstrCopyUTF16ToUTF8(s, &(tl->nu16tou8));
// and finally copy the UTF-8/UTF-16 index conversion tables
tl->u8tou16 = attrstrCopyUTF8ToUTF16(s, &(tl->nUTF8));
tl->u16tou8 = attrstrCopyUTF16ToUTF8(s, &(tl->nUTF16));
// TODO can/should this be moved elsewhere?
uiFree(wDefaultFamily);
@ -193,6 +197,7 @@ uiDrawTextLayout *uiDrawNewTextLayout(uiAttributedString *s, uiDrawFontDescripto
void uiDrawFreeTextLayout(uiDrawTextLayout *tl)
{
uiFree(tl->u16tou8);
uiFree(tl->u8tou16);
uiFree(tl->lineInfo);
tl->layout->Release();
tl->format->Release();
@ -294,11 +299,94 @@ void uiDrawTextLayoutLineGetMetrics(uiDrawTextLayout *tl, int line, uiDrawTextLa
m->ParagraphSpacing = 0; // TODO
}
// TODO stretches space at the end of a line to the whole line
void uiDrawTextLayoutHitTest(uiDrawTextLayout *tl, double x, double y, uiDrawTextLayoutHitTestResult *result)
{
// TODO
DWRITE_HIT_TEST_METRICS m;
size_t line;
double width, height;
BOOL trailing, inside; // crashes if I skip these :/
HRESULT hr;
hr = tl->layout->HitTestPoint(x, y,
&trailing, &inside,
&m);
if (hr != S_OK)
logHRESULT(L"error hit-testing IDWriteTextLayout", hr);
// figure out what line this is
if (y < 0)
line = 0;
else
for (line = 0; line < tl->nLines; line++)
if (y >= tl->lineInfo[line].y && y < (tl->lineInfo[line].y + tl->lineInfo[line].height))
break;
if (line == tl->nLines) // last position
line--;
result->Pos = tl->u16tou8[m.textPosition];
result->Line = line;
uiDrawTextLayoutExtents(tl, &width, &height);
result->XPosition = uiDrawTextLayoutHitTestPositionInside;
if (x < 0)
result->XPosition = uiDrawTextLayoutHitTestPositionBefore;
else if (x >= width)
result->XPosition = uiDrawTextLayoutHitTestPositionAfter;
result->YPosition = uiDrawTextLayoutHitTestPositionInside;
if (y < 0)
result->YPosition = uiDrawTextLayoutHitTestPositionBefore;
else if (y >= height)
result->YPosition = uiDrawTextLayoutHitTestPositionAfter;
}
void uiDrawTextLayoutByteRangeToRectangle(uiDrawTextLayout *tl, size_t start, size_t end, uiDrawTextLayoutByteRangeRectangle *r)
{
DWRITE_HIT_TEST_METRICS mstart, mend;
size_t line;
FLOAT x, y; // crashes if I skip these :/
BOOL trailing, inside; // crashes if I skip these :/
HRESULT hr;
start = tl->u8tou16[start];
end = tl->u8tou16[end];
// TODO explain why this is a leading hit
hr = tl->layout->HitTestTextPosition(start, FALSE,
&x, &y,
&mstart);
if (hr != S_OK)
logHRESULT(L"error getting rect of start position", hr);
// figure out what line this is
for (line = 0; line < tl->nLines; line++)
if (start >= tl->lineInfo[line].startPos && start < tl->lineInfo[line].endPos)
break;
if (line == tl->nLines) // last position
line--;
if (end > tl->lineInfo[line].endPos)
end = tl->lineInfo[line].endPos;
hr = tl->layout->HitTestTextPosition(end, FALSE,
&x, &y,
&mend);
if (hr != S_OK)
logHRESULT(L"error getting rect of end position", hr);
r->X = mstart.left;
r->Y = tl->lineInfo[line].y;
r->Width = mend.left - mstart.left;
r->Height = tl->lineInfo[line].height;
hr = tl->layout->HitTestPoint(r->X, r->Y,
&trailing, &inside,
&mstart);
if (hr != S_OK)
logHRESULT(L"TODO write this", hr);
// TODO also get the end pos just so we can have an accurate r->RealEnd
r->RealStart = mstart.textPosition;
r->RealEnd = end;
r->RealStart = tl->u16tou8[r->RealStart];
r->RealEnd = tl->u16tou8[r->RealEnd];
}