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// 7 december 2014
static void makeHeader(struct table *t, HINSTANCE hInstance)
{
t->header = CreateWindowExW(0,
WC_HEADERW, L"",
// 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)
// TODO WS_BORDER?
// TODO is HDS_HOTTRACK needed?
WS_CHILD | HDS_FULLDRAG | HDS_HORZ | HDS_HOTTRACK,
0, 0, 0, 0, // no initial size
t->hwnd, (HMENU) 100, hInstance, NULL);
if (t->header == NULL)
panic("error creating Table header");
}
static void destroyHeader(struct table *t)
{
if (DestroyWindow(t->header) == 0)
panic("error destroying Table header");
}
static void repositionHeader(struct table *t)
{
RECT r;
WINDOWPOS wp;
HDLAYOUT l;
if (GetClientRect(t->hwnd, &r) == 0)
panic("error getting client rect for Table header repositioning");
// we fake horizontal scrolling here by extending the client rect to the left by the scroll position
r.left -= t->hscrollpos;
l.prc = &r;
l.pwpos = ℘
if (SendMessageW(t->header, HDM_LAYOUT, 0, (LPARAM) (&l)) == FALSE)
panic("error getting new Table header position");
if (SetWindowPos(t->header, wp.hwndInsertAfter,
wp.x, wp.y, wp.cx, wp.cy,
// see above on showing the header here instead of in the CreateWindowExW() call
wp.flags | SWP_SHOWWINDOW) == 0)
panic("error repositioning Table header");
t->headerHeight = wp.cy;
}
static void headerAddColumn(struct table *t, WCHAR *name)
{
HDITEMW item;
ZeroMemory(&item, sizeof (HDITEMW));
item.mask = HDI_WIDTH | HDI_TEXT | HDI_FORMAT;
item.cxy = 200; // TODO
item.pszText = name;
item.fmt = HDF_LEFT | HDF_STRING;
// TODO replace 100 with (t->nColumns - 1)
if (SendMessage(t->header, HDM_INSERTITEM, (WPARAM) (100), (LPARAM) (&item)) == (LRESULT) (-1))
panic("error adding column to Table header");
}
// TODO make a better name for this?
// TODO move to hscroll.h?
// TODO organize this in general...
// TODO because of this function's new extended functionality only hscrollto() is allowed to call repositionHeader()
static void updateTableWidth(struct table *t)
{
HDITEMW item;
intptr_t i;
RECT client;
t->width = 0;
// TODO count dividers?
// TODO use columnWidth()
for (i = 0; i < t->nColumns; i++) {
ZeroMemory(&item, sizeof (HDITEMW));
item.mask = HDI_WIDTH;
if (SendMessageW(t->header, HDM_GETITEM, (WPARAM) i, (LPARAM) (&item)) == FALSE)
panic("error getting Table column width for updateTableWidth()");
t->width += item.cxy;
}
if (GetClientRect(t->hwnd, &client) == 0)
panic("error getting Table client rect in updateTableWidth()");
t->hpagesize = client.right - client.left;
// this part is critical: if we resize the columns to less than the client area width, then the following hscrollby() will make t->hscrollpos negative, which does very bad things
// note to self: do this regardless of whether the table width or the client area width was changed
if (t->hpagesize > t->width)
t->hpagesize = t->width;
// do a dummy scroll to update the horizontal scrollbar to use the new width
hscrollby(t, 0);
}
HANDLER(headerNotifyHandler)
{
NMHDR *nmhdr = (NMHDR *) lParam;
if (nmhdr->hwndFrom != t->header)
return FALSE;
if (nmhdr->code != HDN_ITEMCHANGED)
return FALSE;
updateTableWidth(t);
// TODO make more intelligent
InvalidateRect(t->hwnd, NULL, TRUE);
// TODO UpdateWindow()?
*lResult = 0;
return TRUE;
}
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