96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
// 4 december 2014
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struct rowcol {
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intptr_t row;
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intptr_t column;
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};
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static struct rowcol clientCoordToRowColumn(struct table *t, POINT pt)
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{
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RECT r;
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struct rowcol rc;
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intptr_t i;
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RECT colrect;
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// initial values for the PtInRect() check
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rc.row = -1;
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rc.column = -1;
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if (GetClientRect(t->hwnd, &r) == 0)
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panic("error getting Table client rect in clientCoordToRowColumn()");
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r.top += t->headerHeight;
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if (PtInRect(&r, p) == 0)
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return rc;
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// the row is easy
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rc.row = (pt.y / rowht(t)) + t->yscrollpos;
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// the column... not so much
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// we scroll p.x, then subtract column widths until we cross the left edge of the control
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p.x += t->hscrollpos;
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rc.column = 0;
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for (i = 0; i < t->nColumns; i++) {
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// TODO error check
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SendMessage(t->header, HDM_GETITEMRECT, (WPARAM) i, (LPARAM) (&colrect));
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p.x -= colrect.right - colrect.left;
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// use <, not <=, here:
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// assume r.left and t->hscrollpos == 0;
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// given the first column is 100 wide,
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// p.x == 0 (first pixel of col 0) -> p.x - 100 == -100 < 0 -> break
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// p.x == 99 (last pixel of col 0) -> p.x - 100 == -1 < 0 -> break
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// p.x == 100 (first pixel of col 1) -> p.x - 100 == 0 >= 0 -> next column
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if (p.x < r.left)
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break;
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rc.column++;
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}
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// TODO what happens if the break was never taken?
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return rc;
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}
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// same as client coordinates, but stored in a lParam (like the various mouse messages provide)
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static struct rowcol lParamToRowColumn(struct table *t, LPARAM lParam)
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{
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POINT pt;
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pt.x = GET_X_LPARAM(lParam);
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pt.y = GET_Y_LPARAM(lParam);
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return clientCoordToRowColumn(t, pt);
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}
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// returns TRUE if the row is visible and thus has client coordinates; FALSE otherwise
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static BOOL rowColumnToClientCoord(struct table *t, struct rowcol rc, struct POINT *pt)
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{
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// TODO
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}
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// TODO idealCoordToRowColumn/rowColumnToIdealCoord?
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// TODO find a better place for this
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static LONG rowHeight(struct table *t, HDC dc, BOOL select)
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{
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BOOL release;
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HFONT prevfont, newfont;
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TEXTMETRICW tm;
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release = FALSE;
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if (dc == NULL) {
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dc = GetDC(t->hwnd);
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if (dc == NULL)
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panic("error getting Table DC for rowHeight()");
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release = TRUE;
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}
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if (select)
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prevfont = selectFont(t, dc, &newfont);
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if (GetTextMetricsW(dc, &tm) == 0)
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panic("error getting text metrics for rowHeight()");
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if (select)
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deselectFont(dc, prevfont, newfont);
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if (release)
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if (ReleaseDC(t->hwnd, dc) == 0)
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panic("error releasing Table DC for rowHeight()");
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return tm.tmHeight;
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}
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#define rowht(t) rowHeight(t, NULL, TRUE)
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