WM 6.5 - disable drag scroll for a given list
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From: RaNo on 9 Oct 2009 14:13 Hi, WM 6.5 has introduced whole-clientarea drag scrolling of various UI elements with side scrollbars. I'd like to disable this feature for a given listbox in my app. This interferes with the drag&drop functionality that I implemented in this listbox. How to disable this new feature in WM 6.5?
From: Christopher Fairbairn [MVP] on 20 Oct 2009 17:16
Hi, "RaNo" <google(a)ranosoft.net> wrote in message news:ae2ce1be-55aa-4674-9ba0-47adbf0e4af0(a)j39g2000yqh.googlegroups.com... > WM 6.5 has introduced whole-clientarea drag scrolling of various UI > elements with side scrollbars. I'd like to disable this feature for a > given listbox in my app. This interferes with the drag&drop > functionality that I implemented in this listbox. I did a little digging through the MSDN documentation (http://msdn.microsoft.com/en-us/library/ee220935.aspx etc) and couldn't find a window style or similiar feature that could programatically toggle this functionality on and off cleanly. It may exist, but I couldn't find it.. The best approach I am aware of at present is to subclass the window procedure of the listbox and make it ignore any WM_GESTURE window messages it receives by sending them directly to the default window procedure. For example within a native C or C++ application you could use the following source code (assuming hWndList is the HWND of your listbox). #include <gesture.h> LRESULT CALLBACK DisableAutoScrollWindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { WNDPROC oldProc = (WNDPROC)GetWindowLong(hWnd, GWL_USERDATA); if (message == WM_GESTURE) return DefWindowProc(hWnd, message, wParam, lParam); else return CallWindowProc(oldProc, hWnd, message, wParam, lParam); } // This will hook up the new window procedure, call this from within WM_CREATE or WM_INITDIALOG etc SetWindowLong(hWndList, GWL_USERDATA, GetWindowLong(hWndList, GWL_WNDPROC)); SetWindowLong(hWndList, GWL_WNDPROC, (LONG)DisableAutoScrollWindowProc); If you are developing for the .NET CF, you could also use this technique. Take a look at an article such as "How to: Use a Class for Hooking Windows Procedures" - http://msdn.microsoft.com/en-us/library/ms229658.aspx - to determine how this could be converted into a couple of P/Invoke calls. Hope this helps, Christopher Fairbairn |