How to make a form draggable in mobile 6.5

Question

I'm developing an aplication for windows mobile 6.5 (c#, .net, compact framework) and i'm having a hard time finding how to drag my form up and down without using the default scroll bar. My form is bigger than the device's screen and i don't want the user to use the default scroll bar, but drag the form instead.

Any idea on how to do this?

thanks

score 1 · Answer 1 · answered Oct 30 '12 at 14:34

Thorsten is right, the Form creation is hardcoded into any of the Compact Framework Runtimes and you cannot create a non-fullscreen Form (which is a dialog in view of windows).

If you start to develop a native C/C++ Windows CE project in VS (2003/2005/2008) the window sizes are free at your definition.

BUT, using pinvoke to change the window style of the form after creation, you can have a moveable window form:

enter image description here

And after applying (the same) window style and a bit resizing:

enter image description here

Here is a code snippet for C# Compact Framework:

    using System;

using System.Collections.Generic;
using System.Text;

using System.Runtime.InteropServices;
using System.Reflection;

namespace MovableForm
{
    class winapi
    {
        public static void moveWindow(System.Windows.Forms.Form form){
            SetWindowPos(form.Handle, (IntPtr) HWNDPOS.HWND_TOPMOST, form.Left + 10, form.Top + 10, form.Width - 20, form.Height - 20, (uint)SWP.SWP_SHOWWINDOW);
        }

        public static void setStyle(System.Windows.Forms.Form frm)
        {
            uint oldStyle = getStyle(frm);
            uint newStyle = (uint)(
                            WINSTYLES.WS_OVERLAPPED | WINSTYLES.WS_POPUP | WINSTYLES.WS_VISIBLE | 
                            //WINSTYLES.WS_SYSMENU |  // add if you need a X to close
                            WINSTYLES.WS_CAPTION | WINSTYLES.WS_BORDER | //WINSTYLES.WS_DLGFRAME | WINSTYLES.WS_MAXIMIZEBOX |
                            WINSTYLES.WS_POPUPWINDOW);
            int iRet = SetWindowLong(frm.Handle, (int)GWL.GWL_STYLE, (int)newStyle);
            //if returned iRet is zero we got an error

            int newExStyle = GetWindowLong(frm.Handle, (int)GWL.GWL_EXSTYLE);
            newExStyle = (int)((uint)newExStyle - (uint) WINEXSTYLES.WS_EX_CAPTIONOKBTN); //remove OK button
            iRet = SetWindowLong(frm.Handle, (int)GWL.GWL_EXSTYLE, (int)newExStyle);
            moveWindow(frm);
            frm.Refresh();
        }

        //great stuff by http://ideas.dalezak.ca/2008/11/enumgetvalues-in-compact-framework.html
        public static IEnumerable<Enum> GetValues(Enum enumeration)
        {
            List<Enum> enumerations = new List<Enum>();
            foreach (FieldInfo fieldInfo in enumeration.GetType().GetFields(
                  BindingFlags.Static | BindingFlags.Public))
            {
                enumerations.Add((Enum)fieldInfo.GetValue(enumeration));
            }
            return enumerations;
        }
...

Then there are the enums I used (sorry about all the casting, I never understand, why flags are defined as int in API calls):

        [DllImport("coredll.dll", SetLastError = true)]
    private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
    [DllImport("coredll.dll", SetLastError = true)]
    private static extern int GetWindowLong(IntPtr hWnd, int nIndex);

    //non-fullscreen window (ex zDump) = WS_STYLE=0x90c9004, WS_EX_STYLE=0x00000008
    //WS_POPUP | WS_VISIBLE
    enum GWL:int{
        GWL_STYLE = -16,
        GWL_EXSTYLE = -20,
    }

    [Flags]
    enum WINSTYLES:uint{
        WS_OVERLAPPED =     0x00000000,    //#define WS_OVERLAPPED       WS_BORDER | WS_CAPTION
        WS_POPUP=           0x80000000,
        WS_VISIBLE=         0x10000000,
        WS_MINIMIZE=        0x20000000,
        WS_CLIPSIBLINGS=    0x04000000,
        WS_CLIPCHILDREN=    0x02000000,
        WS_DISABLED=        0x08000000,
        WS_MAXIMIZE=        0x01000000,
        WS_CAPTION =        0x00C00000,    //#define WS_CAPTION          0x00C00000L     /* WS_BORDER | WS_DLGFRAME  */
        WS_BORDER=          0x00800000,
        WS_DLGFRAME=        0x00400000,
        WS_VSCROLL=         0x00200000,
        WS_HSCROLL=         0x00100000,
        WS_SYSMENU=         0x00080000,
        WS_THICKFRAME=      0x00040000,
        WS_MINIMIZEBOX=     0x00020000,
        WS_MAXIMIZEBOX=     0x00010000,
        WS_POPUPWINDOW=     0x80880000,     //  Creates a pop-up window with WS_BORDER, WS_POPUP, and WS_SYSMENU styles. The WS_CAPTION and WS_POPUPWINDOW styles must be combined to make the window menu visible.
    }
    enum WINEXSTYLES:uint{
        WS_EX_DLGMODALFRAME    = 0x00000001,
        WS_EX_TOPMOST          = 0x00000008,
        WS_EX_TOOLWINDOW       = 0x00000080,
        WS_EX_WINDOWEDGE       = 0x00000100,
        WS_EX_CLIENTEDGE       = 0x00000200,
        WS_EX_CONTEXTHELP      = 0x00000400,
        WS_EX_RIGHT            = 0x00001000,
        WS_EX_RTLREADING       = 0x00002000,
        WS_EX_LEFTSCROLLBAR    = 0x00004000,
        WS_EX_STATICEDGE       = 0x00020000,
        WS_EX_NOINHERITLAYOUT  = 0x00100000, // Disable inheritence of mirroring by children
        WS_EX_LAYOUTRTL        = 0x00400000, // Right to left mirroring
        WS_EX_OVERLAPPEDWINDOW = 0x00000300, // (WS_EX_WINDOWEDGE | WS_EX_CLIENTEDGE)
        WS_EX_CAPTIONOKBTN     = 0x80000000,
        WS_EX_NODRAG           = 0x40000000,
        WS_EX_ABOVESTARTUP     = 0x20000000,
        WS_EX_INK              = 0x10000000,
        WS_EX_NOANIMATION      = 0x04000000,
}

...

            [DllImport("coredll.dll", SetLastError = true)]

        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int cx, int cy, uint uFlags);

        enum SWP{
            SWP_ASYNCWINDOWPOS = 0x4000,
            SWP_DEFERERASE = 0x2000,
            SWP_DRAWFRAME = 0x0020,
            SWP_FRAMECHANGED = 0x0020,
            SWP_HIDEWINDOW = 0x0080,
            SWP_NOACTIVATE = 0x0010,
            SWP_NOCOPYBITS = 0x0100,
            SWP_NOMOVE = 0x0002,
            SWP_NOOWNERZORDER = 0x0200,
            SWP_NOREDRAW = 0x0008,
            SWP_NOREPOSITION = 0x0200,
            SWP_NOSENDCHANGING = 0x0400,
            SWP_NOSIZE = 0x0001,
            SWP_NOZORDER = 0x0004,
            SWP_SHOWWINDOW = 0x0040,
        }
        enum HWNDPOS{
            HWND_TOP = 0,
            HWND_BOTTOM = 1,
            HWND_TOPMOST = -1,
            HWND_NOTOPMOST = -2,
        }
    }
}

Hopefully, stackoverflow enables the upload of code sometime in near future.

regards

Josef

The essential window style to change is WS_CAPTION. ~josef – josef Oct 30 '12 at 15:33 — josef, Oct 30 '12 at 15:33

score 0 · Answer 2 · answered Oct 29 '12 at 12:29

0

Forms can not be moved on the screen in Windows Mobile. They also can not take only part of the screen. This is only possible in Windows CE.

answered Oct 29 '12 at 12:29

Thorsten Dittmar

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How to make a form draggable in mobile 6.5

2 Answers2