81 lines
2.8 KiB
C
81 lines
2.8 KiB
C
// 7 december 2014
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// TODO verify header events (double-clicking on a divider, for example)
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static void makeHeader(struct table *t, HINSTANCE hInstance)
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{
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t->header = CreateWindowExW(0,
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WC_HEADERW, L"",
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// don't set WS_VISIBLE; according to MSDN we create the header hidden as part of setting the initial position (http://msdn.microsoft.com/en-us/library/windows/desktop/ff485935%28v=vs.85%29.aspx)
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// TODO WS_BORDER?
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// TODO is HDS_HOTTRACK needed?
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WS_CHILD | HDS_FULLDRAG | HDS_HORZ | HDS_HOTTRACK,
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0, 0, 0, 0, // no initial size
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t->hwnd, (HMENU) 100, hInstance, NULL);
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if (t->header == NULL)
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panic("error creating Table header");
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}
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static void destroyHeader(struct table *t)
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{
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if (DestroyWindow(t->header) == 0)
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panic("error destroying Table header");
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}
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// to avoid weird bugs, the only functions allowed to call this one are the horizontal scroll functions
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// when we need to reposition the header in a situation other than a user-initiated scroll, we use a dummy scroll (hscrollby(t, 0))
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// see update() in update.h
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static void repositionHeader(struct table *t)
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{
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RECT r;
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WINDOWPOS wp;
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HDLAYOUT l;
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if (GetClientRect(t->hwnd, &r) == 0)
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panic("error getting client rect for Table header repositioning");
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// we fake horizontal scrolling here by extending the client rect to the left by the scroll position
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r.left -= t->hscrollpos;
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l.prc = &r;
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l.pwpos = ℘
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if (SendMessageW(t->header, HDM_LAYOUT, 0, (LPARAM) (&l)) == FALSE)
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panic("error getting new Table header position");
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if (SetWindowPos(t->header, wp.hwndInsertAfter,
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wp.x, wp.y, wp.cx, wp.cy,
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// see above on showing the header here instead of in the CreateWindowExW() call
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wp.flags | SWP_SHOWWINDOW) == 0)
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panic("error repositioning Table header");
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t->headerHeight = wp.cy;
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}
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static void headerAddColumn(struct table *t, WCHAR *name)
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{
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HDITEMW item;
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ZeroMemory(&item, sizeof (HDITEMW));
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item.mask = HDI_WIDTH | HDI_TEXT | HDI_FORMAT;
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item.cxy = 200; // TODO
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item.pszText = name;
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item.fmt = HDF_LEFT | HDF_STRING;
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// TODO replace 100 with (t->nColumns - 1)
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if (SendMessage(t->header, HDM_INSERTITEM, (WPARAM) (100), (LPARAM) (&item)) == (LRESULT) (-1))
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panic("error adding column to Table header");
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}
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// TODO is this triggered if we programmatically move headers (for autosizing)?
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HANDLER(headerNotifyHandler)
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{
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NMHDR *nmhdr = (NMHDR *) lParam;
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if (nmhdr->hwndFrom != t->header)
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return FALSE;
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if (nmhdr->code != HDN_ITEMCHANGED)
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return FALSE;
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update(t, TRUE);
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// TODO make more intelligent
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// to do this, we have to redraw the column to the left of the divider that was dragged and scroll everything to the right normally (leaving the hole that was scrolled invalidated as well)
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// of course, this implies that dragging a divider only resizes the column of which it is the right side of and moves all others
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InvalidateRect(t->hwnd, NULL, TRUE);
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*lResult = 0;
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return TRUE;
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}
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