Von: Damon Chandler
\nBetreff: Re: TListView Headers
\nDatum: Montag, 12. April 1999 07:38<\/p>\n
Sebastian,
\n\tWhay you need first is a handle to the ListView’s header control. This
\ncan be done with a call to the API function GetDlgItem()…<\/p>\n
[code lang=”delphi”]HeaderHandle : HWND;
\nHeaderHandle := GetDlgItem(ListView1.Handle, 0);
\n[\/code]
\nNow that you have a handle to the header control, what you need to do is
\nchange the header control to owner-drawn. This is done with a call to
\nthe SetHeader_Item API call…<\/p>\n
[code lang=”delphi”] hdi : HD_ITEM; <\/p>\n
for i := 0 to ListView1.Columns.Count – 1 do
\n begin <\/p>\n
hdi.mask := HDI_TEXT and HDI_FORMAT and HDI_WIDTH; <\/p>\n
{Flag owner draw state}
\n hdi.fmt := HDF_LEFT and HDF_OWNERDRAW and HDF_STRING; <\/p>\n
hdi.cxy := Columns.Items[i].Width;
\n hdi.cchTextMax := Columns.Items[i].Caption.Length(); <\/p>\n
hdi.pszText := Columns.Items[i].Caption; <\/p>\n
{Force the changes}
\n Header_SetItem(HeaderHandle, index, hdi^); <\/p>\n
end
\n[\/code]
\nNow that the headers are owner-drawn, Windows will send the ListView the
\nWM_DRAWITEM message which you have to trap in the ListView’s WindowProc
\n(or a derived unit from TListView) and decode. The LParam of the
\nWM_DRAWITEM message is a DRAWITEM structure. Its member will give you
\nvital info about how to draw the headers, including bounding rect and
\ndevice context. Unfotunately, my Object Pascal is rusty so I can’t give
\nany more specifics, but if you can read C++, I have an article on how to
\ndo this using C++ Builder at…<\/p>\n
http:\/\/bcbcaq.freeservers.com
\nhttp:\/\/bcbcaq.freeservers.com<\/p>\n
in the “ListViews and TreeViews” section. Good luck.<\/p>\n
\/\/Damon<\/p>\n
[tags]Delphi, Components, ListView[\/tags]<\/p>\n","protected":false},"excerpt":{"rendered":"
Von: Damon Chandler Betreff: Re: TListView Headers Datum: Montag, 12. April 1999 07:38 Sebastian, Whay you need first is a handle to the…<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[11],"tags":[90,75,78],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p71Tml-1p","_links":{"self":[{"href":"https:\/\/www.nsonic.de\/blog\/wp-json\/wp\/v2\/posts\/87"}],"collection":[{"href":"https:\/\/www.nsonic.de\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nsonic.de\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nsonic.de\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nsonic.de\/blog\/wp-json\/wp\/v2\/comments?post=87"}],"version-history":[{"count":0,"href":"https:\/\/www.nsonic.de\/blog\/wp-json\/wp\/v2\/posts\/87\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.nsonic.de\/blog\/wp-json\/wp\/v2\/media?parent=87"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nsonic.de\/blog\/wp-json\/wp\/v2\/categories?post=87"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nsonic.de\/blog\/wp-json\/wp\/v2\/tags?post=87"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}