{"id":140,"date":"2010-06-30T17:08:00","date_gmt":"2010-06-30T17:08:00","guid":{"rendered":"http:\/\/madprogrammer76.wordpress.com\/2010\/06\/30\/dotnet-windows-form-image-transparency"},"modified":"2010-06-30T17:08:00","modified_gmt":"2010-06-30T17:08:00","slug":"dotnet-windows-form-image-transparency","status":"publish","type":"post","link":"http:\/\/andrewpallant.ca\/wordpress\/dotnet-windows-form-image-transparency\/","title":{"rendered":"DotNet Windows Form Image Transparency"},"content":{"rendered":"

Recently during a project I had a need to overlay an image on a windows form in order to indicate a status of inability.\u00a0 This image had a semi-transparency quality as well as a full transparency background.\u00a0 To my dismay, the semi-transparency rendered in full color and the full transparency background seemed to inherit the parent form, but not show the controls behind it as one would expect.<\/p>\n

After sometime of researching the issue, I came to a determination that what I was trying to do could only be done in web development (HTML).\u00a0 From my research I had assembled some ideas in how to make transparencies work.\u00a0\u00a0 I took ideas from several sources and came up with the following.<\/p>\n

Step By Step ( see Sample Code )<\/strong><\/p>\n

1. Create a class that extends System.Windows.Forms.Control
\n2. Place code from sample cod
\n3. Compile Project
\n4. Add new control to the Form ( remember this is for a windows application )
\n5. Set Background Image<\/p>\n

Sample Code<\/strong><\/p>\n

\n\nprotected override CreateParams CreateParams\n{\n     \/\/ Make window transparent\n     get\n     {\n          CreateParams cp = base.CreateParams;\n          cp.ExStyle |= 0x20;  \/\/ WS_EX_TRANSPARENT return cp;\n     }\n}\n\nprotected override void OnPaintBackground(PaintEventArgs pevent)\n{\n\/\/ Do not paint the background\n}\n\nprotected override void OnPaint(PaintEventArgs e)\n{ \n     \/\/ Paint background image \n     if (BackgroundImage != null)\n     {\n          Bitmap bmp = new Bitmap(BackgroundImage);\n          bmp.MakeTransparent(Color.White);\n          e.Graphics.DrawImage(bmp, 0, 0, Width, Height);\n     }\n}<\/pre>\n
Note:\u00a0 <\/strong>When you overlay an image – even transparent, you may see the controls behind, but you will not be able to access them.\u00a0 This is true in both web and windows development.<\/p>\n","protected":false},"excerpt":{"rendered":"
Recently during a project I had a need to overlay an image on a windows form in order to indicate a status of inability.\u00a0 This image had a semi-transparency quality as well as a full transparency background.\u00a0 To my dismay, the semi-transparency rendered in full color and the full transparency background seemed to inherit the … Continue reading DotNet Windows Form Image Transparency<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,13,23,25],"tags":[],"yoast_head":"\r\nDotNet Windows Form Image Transparency - LDNDeveloper<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"http:\/\/andrewpallant.ca\/wordpress\/dotnet-windows-form-image-transparency\/\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"DotNet Windows Form Image Transparency - 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