Customize Save file dialog to be similar to underlying OS save dialog C#

Question

I have been using this example to customize the save dialog,

http://www.codeproject.com/Articles/19566/Extend-OpenFileDialog-and-SaveFileDialog-the-easy

This wor

Answer 1

The suggested solution works as described:

The Save As file dialog (used in this example) is associated to a User Control, called CustomSaveFileDialog. It has the advantage that it is present in the Toolbox, and that it implements automatically the IDisposable interface. However, it could have also been a simple C# class.

This control has a constructor accepting an arbitrary application specific User Control hosting all the elements which are to show up in the File Dialog. When I got the question right, that is what is required.

The CustomSaveFileDialog has the following properties:

• Accepting arbitrary User Controls Docked to the bottom of the File Dialog, i.e. they follow the resizing of the File Dialog
• No special behaviour for the additional elements (buttons, images, checkboxes etc) is necessary. They act quite normally, as in other windows.

This is the code of the described class:

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Diagnostics;

namespace customSaveFileDialog
{
    public partial class CustomSaveFileDialog : UserControl
    {
        //https://stackoverflow.com/questions/9665579/setting-up-hook-on-windows-messages
        delegate void WinEventDelegate(IntPtr hWinEventHook, uint eventType,
            IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime);

        const uint WINEVENT_OUTOFCONTEXT = 0;

        [DllImport("user32.dll")]
        private static extern IntPtr SetWinEventHook(uint eventMin, uint eventMax, IntPtr
           hmodWinEventProc, WinEventDelegate lpfnWinEventProc, uint idProcess,
           uint idThread, uint dwFlags);

        [DllImport("user32.dll")]
        private static extern bool UnhookWinEvent(IntPtr hWinEventHook);

        [DllImport("user32.dll")]
        private static extern bool MoveWindow(IntPtr hWnd, int x, int y, int w, int h, bool repaint);
        private struct RECT { public int Left; public int Top; public int Right; public int Bottom; }

        [DllImport("user32.dll")]
        private static extern bool GetClientRect(IntPtr hWnd, out RECT rc);

        [DllImport("kernel32.dll")]
        private static extern uint GetLastError();

        [DllImport("user32.dll", SetLastError = true)]
        private static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

        [DllImport("user32.dll", SetLastError = true)]
        private static extern IntPtr SetParent(IntPtr hwndChild, IntPtr hwndNewParent);

        [DllImport("user32.dll", SetLastError = true)]
        private static extern IntPtr GetParent(IntPtr hWnd);

        private IntPtr hDlg;        // Save As dialog handle
        private IntPtr hHook;       // Event hook
        private IntPtr hCtrl;       // App. specific user control handle

        UserControl ctrl;           // App. specific user control

        //Static variable containing the instance object
        private static CustomSaveFileDialog customSaveFileDialog;

        //public property for the user
        //theSaveFileDialog has been added to the control in the designer from the Toolbox
        public SaveFileDialog Dlg { get { return theSaveFileDialog; } }

        //Event hook delegate
        private static WinEventDelegate procDelegate = new WinEventDelegate(WinEventProc);

        /// <summary>
        /// Constructor
        /// </summary>
        /// <param name="ctrl">The User Control to be displayed in the file dialog</param>
        public CustomSaveFileDialog(UserControl ctrl)
        {
            InitializeComponent();

            customSaveFileDialog = this;
            this.ctrl = ctrl;
            hCtrl = ctrl.Handle;

            //Setup Hook; for simplicity, hook all possible events from the current process
            hHook = SetWinEventHook(1, 0x7fffffff, IntPtr.Zero,
                    procDelegate, (uint)Process.GetCurrentProcess().Id, 0, WINEVENT_OUTOFCONTEXT);
        }


        // Hook function
        static void WinEventProc(IntPtr hWinEventHook, uint eventType,
            IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
        {
            CustomSaveFileDialog csfdg = customSaveFileDialog;
            if (csfdg.hDlg == IntPtr.Zero)
                csfdg.hDlg = FindWindowEx(IntPtr.Zero, IntPtr.Zero, "#32770", "Save As");

            if (hwnd == csfdg.hDlg) 
            {
                IntPtr hParent = GetParent(csfdg.hCtrl);

                //this is done only once
                if (!(hParent == csfdg.hDlg))
                    SetParent(csfdg.hCtrl, csfdg.hDlg);   //Bind the user control to the Common Dialog

                RECT cliRect;
                GetClientRect(csfdg.hDlg, out cliRect);

                //Position the button in the file dialog
                MoveWindow(csfdg.hCtrl, cliRect.Left + 130, cliRect.Bottom - 55, 500, 60, true);
            }
        }
    }
}

The essential part is the hooking of the windows events. This has been taken from that post.

It may be noted that the "FindWindowEx" function (in the WinEventProc) finds all Common Dialogs (and probably more) with a title of "Save As". If this should be a problem, more filtering would be necessary, e.g by searching in the current thread only. Such a search function may be found here.

Additionally (not shown in the above code) the "Dispose" method in CustormSaveFileDialog.desinger.cs contains the Unhook function with the hHook handle as the parameter.

The software has been tested in Windows7 in Debug mode. As a test, a simple Forms window with a button has been implemented:

        //Test for the customized "Save As" dialog
        private void button1_Click(object sender, EventArgs e)
        {
            //Arbitrary User Control
            myUserControl ctrl = new myUserControl();

            using (CustomSaveFileDialog csfdg = new CustomSaveFileDialog(ctrl))
            {
                csfdg.Dlg.FileName = "test";

                //Show the Save As dialog associated to the CustomFileDialog control
                DialogResult res = csfdg.Dlg.ShowDialog();
                if (res == System.Windows.Forms.DialogResult.OK)
                    MessageBox.Show("Save Dialog Finished");
            }
        }

And - as well as a test - the applicatioin specific user control handles the following events:

using System;
using System.Windows.Forms;

namespace CustomFile
{
    public partial class myUserControl : UserControl
    {
        public myUserControl()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show("Button Clicked");
        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {
            MessageBox.Show("Image Clicked");

        }

        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            if (!checkBox1.Checked)
                pictureBox1.Visible = false;
            else
                pictureBox1.Visible = true;
        }
    }
}

The following output is produced:

The next picture shows another screenshot, File Dialog resized, and the checkbox to display the image is unchecked.