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Implemented the new hit-test functions on Windows.

This commit is contained in:
Pietro Gagliardi 2017-02-08 20:10:34 -05:00
parent 749a0cddaf
commit 5458e10134
1 changed files with 75 additions and 0 deletions
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75
windows/drawtext.cpp
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@ -300,6 +300,8 @@ void uiDrawTextLayoutLineGetMetrics(uiDrawTextLayout *tl, int line, uiDrawTextLa
m->ParagraphSpacing = 0; // TODO
}
#if 0 /* TODO */
// expected behavior on end of line:
// - same as OS X
// - TODO RETEST THIS ON OTHER PLATFORMS: EXCEPT: if you type something, then backspace, the cursor will move back to where you clicked!
@ -398,3 +400,76 @@ void uiDrawTextLayoutByteRangeToRectangle(uiDrawTextLayout *tl, size_t start, si
r->RealStart = tl->u16tou8[r->RealStart];
r->RealEnd = tl->u16tou8[r->RealEnd];
}
#endif
// this algorithm comes from Microsoft's PadWrite sample, following TextEditor::SetSelectionFromPoint()
void uiDrawTextLayoutHitTest(uiDrawTextLayout *tl, double x, double y, size_t *pos, int *line)
{
DWRITE_HIT_TEST_METRICS m;
BOOL trailing, inside;
size_t p;
HRESULT hr;
hr = tl->layout->HitTestPoint(x, y,
&trailing, &inside,
&m);
if (hr != S_OK)
logHRESULT(L"error hit-testing IDWriteTextLayout", hr);
p = m.textPosition;
// on a trailing hit, align to the nearest cluster
if (trailing) {
DWRITE_HIT_TEST_METRICS m2;
FLOAT x, y; // crashes if I skip these :/
hr = tl->layout->HitTestTextPosition(m.textPosition, trailing,
&x, &y, &m2);
if (hr != S_OK)
logHRESULT(L"error aligning trailing hit to nearest cluster", hr);
p = m2.textPosition + m2.length;
}
// TODO should we just make the pointers required?
if (pos != NULL)
*pos = tl->u16tou8[p];
// TODO do the line detection unconditionally?
if (line != NULL) {
UINT32 i;
for (i = 0; i < tl->nLines; i++) {
double ltop, lbottom;
ltop = tl->lineInfo[i].y;
lbottom = ltop + tl->lineInfo[i].height;
// y will already >= ltop at this point since the past lbottom should == ltop
if (y < lbottom)
break;
}
if (i == tl->nLines)
i--;
*line = i;
}
}
double uiDrawTextLayoutByteLocationInLine(uiDrawTextLayout *tl, size_t pos, int line)
{
BOOL trailing;
DWRITE_HIT_TEST_METRICS m;
FLOAT x, y;
HRESULT hr;
pos = tl->u8tou16[pos];
// this behavior seems correct
// there's also PadWrite's TextEditor::GetCaretRect() but that requires state...
// TODO where does this fail?
trailing = FALSE;
if (pos != 0 && pos != tl->nUTF16 && pos == tl->lineInfo[line].endPos) {
pos--;
trailing = TRUE;
}
hr = tl->layout->HitTestTextPosition(pos, trailing,
&x, &y, &m);
if (hr != S_OK)
logHRESULT(L"error calling IDWriteTextLayout::HitTestTextPosition()", hr);
return x;
}