137 lines
3.1 KiB
C
137 lines
3.1 KiB
C
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// 29 november 2014
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static LONG rowHeight(struct table *t)
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{
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HFONT thisfont, prevfont;
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TEXTMETRICW tm;
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HDC dc;
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LONG ret;
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dc = GetDC(t->hwnd);
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if (dc == NULL)
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abort();
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thisfont = t->font; // in case WM_SETFONT happens before we return
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prevfont = (HFONT) SelectObject(dc, thisfont);
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if (prevfont == NULL)
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abort();
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if (GetTextMetricsW(dc, &tm) == 0)
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abort();
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if (SelectObject(dc, prevfont) != (HGDIOBJ) (thisfont))
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abort();
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if (ReleaseDC(t->hwnd, dc) == 0)
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abort();
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ret = tm.tmHeight;
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if (ret < t->imagelistHeight)
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ret = t->imagelistHeight;
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if (ret < t->checkboxHeight)
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ret = t->checkboxHeight;
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return ret;
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}
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static void redrawAll(struct table *t)
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{
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if (InvalidateRect(t->hwnd, NULL, TRUE) == 0)
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abort();
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if (UpdateWindow(t->hwnd) == 0)
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abort();
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}
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static RECT realClientRect(struct table *t)
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{
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RECT r;
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if (GetClientRect(t->hwnd, &r) == 0)
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abort();
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r.top += t->headerHeight;
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return r;
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}
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static void repositionHeader(struct table *t)
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{
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RECT r;
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HDLAYOUT headerlayout;
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WINDOWPOS headerpos;
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if (GetClientRect(t->hwnd, &r) == 0) // use the whole client rect
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abort();
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// grow the rectangle to the left to fake scrolling
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r.left -= t->hpos;
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headerlayout.prc = &r;
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headerlayout.pwpos = &headerpos;
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if (SendMessageW(t->header, HDM_LAYOUT, 0, (LPARAM) (&headerlayout)) == FALSE)
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abort();
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if (SetWindowPos(t->header, headerpos.hwndInsertAfter, headerpos.x, headerpos.y, headerpos.cx, headerpos.cy, headerpos.flags | SWP_SHOWWINDOW) == 0)
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abort();
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t->headerHeight = headerpos.cy;
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}
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// this counts partially visible rows
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// for all fully visible rows use t->pagesize
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// cliprect and rowHeight must be specified here to avoid recomputing things multiple times
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static intptr_t lastVisible(struct table *t, RECT cliprect, LONG rowHeight)
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{
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intptr_t last;
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last = ((cliprect.bottom + rowHeight - 1) / rowHeight) + t->firstVisible;
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if (last >= t->count)
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last = t->count;
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return last;
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}
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static void redrawRow(struct table *t, intptr_t row)
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{
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RECT r;
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intptr_t height;
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r = realClientRect(t);
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height = rowHeight(t);
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if (row < t->firstVisible || row > lastVisible(t, r, height)) // not visible; don't bother
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return;
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r.top = (row - t->firstVisible) * height + t->headerHeight;
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r.bottom = r.top + height;
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// keep the width and height the same; it spans the client area anyway
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if (InvalidateRect(t->hwnd, &r, TRUE) == 0)
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abort();
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if (UpdateWindow(t->hwnd) == 0)
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abort();
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}
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static intptr_t hitTestColumn(struct table *t, int x)
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{
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HDITEMW item;
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intptr_t i;
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// TODO count dividers
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for (i = 0; i < t->nColumns; i++) {
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ZeroMemory(&item, sizeof (HDITEMW));
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item.mask = HDI_WIDTH;
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if (SendMessageW(t->header, HDM_GETITEM, (WPARAM) i, (LPARAM) (&item)) == FALSE)
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abort();
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if (x < item.cxy)
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return i;
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x -= item.cxy; // not yet
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}
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// no column
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return -1;
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}
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static void lParamToRowColumn(struct table *t, LPARAM lParam, intptr_t *row, intptr_t *column)
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{
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int x, y;
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LONG h;
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x = GET_X_LPARAM(lParam);
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y = GET_Y_LPARAM(lParam);
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h = rowHeight(t);
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y += t->firstVisible * h;
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y -= t->headerHeight;
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y /= h;
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if (row != NULL) {
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*row = y;
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if (*row >= t->count)
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*row = -1;
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}
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if (column != NULL)
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*column = hitTestColumn(t, x);
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}
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