{"id":64,"date":"2009-06-09T11:53:13","date_gmt":"2009-06-09T19:53:13","guid":{"rendered":"http:\/\/blog.gerrior.com\/?p=64"},"modified":"2011-11-04T09:56:52","modified_gmt":"2011-11-04T17:56:52","slug":"changing-background-color-in-a-cstatic-object","status":"publish","type":"post","link":"https:\/\/blog.gerrior.com\/?p=64","title":{"rendered":"Changing Background Color in a CStatic Object"},"content":{"rendered":"

Here’s a classic example of a seemingly easy problem actually being harder to implement. \u00a0I wanted a dialog with white static controls in MFC. \u00a0The resulting code is simple but divining the answer was no easy feat. \u00a0Ultimately it’s more a failure of documentation that it is a engineering\u00a0challenge. \u00a0More details in my commented code which follows:<\/p>\n

\n
\n
\"Before<\/a><\/dt>\n
Before and After<\/dd>\n<\/dl>\n<\/div>\n


\nHBRUSH TReaderDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
\n{
\nHBRUSH hbr = __super::OnCtlColor(pDC, pWnd, nCtlColor);<\/code><\/p>\n

\n


\n\/\/ For static controls, draw black text on a white
\n\/\/ background (instead of the default Windows
\n\/\/ dialog background color)
\nif (nCtlColor == CTLCOLOR_STATIC)
\n{
\n\/\/ Set the background color to white
\n\/\/ This is a red herring. You will only affect the text
\n\/\/ drawn and the static control is certainly larger than
\n\/\/ the text drawn so you will have the original color
\n\/\/ \"leaking\" out. (see pic)
\n\/\/pDC->SetBkColor(RGB(255, 255, 255));<\/code><\/p>\n

<\/code><\/p>\n


\n\/\/ Set the background mode for the drawn text to
\n\/\/ transparent
\n\/\/ If you use SetBkColor with SetBkMode you will further
\n\/\/ compound the confusion\/frustrtion. Using
\n\/\/ SetBkMode(TRANSPARENT) after SetBkColor cancels
\n\/\/ out SetBkColor.
\npDC->SetBkMode(TRANSPARENT);<\/code><\/p>\n


\n\/\/ The real solution is to create a brush with a solid
\n\/\/ white background and return that from this function.
\n\/\/ Also set the background mode to transparent.<\/code><\/p>\n

static CBrush mBrush(RGB(255, 255, 255)); \/\/ Solid white brush.<\/code><\/p>\n

hbr = mBrush;
\n}<\/code><\/p>\n

<\/code><\/p>\n

\n

\n


\n\/\/ Return a different brush if the default is
\n\/\/ not desired
\nreturn hbr;
\n}
\n<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"

Here’s a classic example of a seemingly easy problem actually being harder to implement. \u00a0I wanted a dialog with white static controls in MFC. \u00a0The resulting code is simple but divining the answer was no easy feat. \u00a0Ultimately it’s more a failure of documentation that it is a engineering\u00a0challenge. \u00a0More details in my commented code … Continue reading Changing Background Color in a CStatic Object<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,6],"tags":[],"class_list":["post-64","post","type-post","status-publish","format-standard","hentry","category-mfc","category-windows"],"_links":{"self":[{"href":"https:\/\/blog.gerrior.com\/index.php?rest_route=\/wp\/v2\/posts\/64","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.gerrior.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.gerrior.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.gerrior.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.gerrior.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=64"}],"version-history":[{"count":13,"href":"https:\/\/blog.gerrior.com\/index.php?rest_route=\/wp\/v2\/posts\/64\/revisions"}],"predecessor-version":[{"id":405,"href":"https:\/\/blog.gerrior.com\/index.php?rest_route=\/wp\/v2\/posts\/64\/revisions\/405"}],"wp:attachment":[{"href":"https:\/\/blog.gerrior.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=64"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.gerrior.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=64"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.gerrior.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=64"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}