Click here to Skip to main content
12,406,971 members (63,679 online)
Click here to Skip to main content

Stats

194.6K views
9.6K downloads
138 bookmarked
Posted

DSGraphEdit: A Reasonable Facsimile of Microsoft's GraphEdit in .NET

, 19 Dec 2007 CPOL
A library for adding DirectShow GraphEdit-like abilities to .NET applications.
WeifenLuo.WinFormsUI.Docking.dll
DaggerLib.dll
DaggerLib.DSGraphEdit.dll
DaggerLib.UI.Windows.dll
DirectShowLib-2005.dll
DSGraphEdit.exe
MediaFoundation.dll
DSGraphEdit
bin
Release
DSIcon.ico
Properties
Referenced Libs
WeifenLuo.WinFormsUI.Docking.dll
RemoteGraphTile.jpg
DaggerLib
bin
Release
Core
Interfaces
Properties
SetGeneric
UI
DaggerLib.DSGraphEdit
DMOParameterControls
DSFilterTreeView
DSGraphEditControls
lib
Properties
ReferencedLibs
DirectShowLib-2005.dll
MediaFoundation.dll
DaggerLib.UI.Windows
AStar
bin
Debug
DaggerPropertyGrid
PropertyGridEx
Properties
using System;
using System.Runtime.InteropServices;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;

using DirectShowLib;
using DirectShowLib.Dvd;
using MediaFoundation.EVR;
using MediaFoundation.Misc;

namespace DaggerLib.DSGraphEdit
{
    [ToolboxItem(false)]
    public partial class VideoInternalWindow : UserControl
    {
        private IVideoWindow _vw;
        private bool _isInit;
        private IMFVideoDisplayControl _evr;
        private DetachedVideoWindow _detachedWindow;
        private bool _isFullScreen = false;
        private string _filterName;
        private IDvdControl2 _dvdControl;
        private bool _handleLost = false;

        // when loading a graph, the EVR can't be initialized to a window until the VideoInternalWindow's handle
        // is fully created
        private bool _delayedInit;

        public VideoInternalWindow(string caption, IBaseFilter filter)
        {
            InitializeComponent();            
            _vw = filter as IVideoWindow;
            _isInit = false;
            _filterName = caption;

            this.Resize += new EventHandler(VideoInternalWindow_Resize);
            this.Paint += new PaintEventHandler(VideoInternalWindow_Paint);
            this.MouseMove += new MouseEventHandler(VideoInternalWindow_MouseMove);
            this.MouseDown += new MouseEventHandler(VideoInternalWindow_MouseDown);
        }

        public VideoInternalWindow(string caption, IMFVideoDisplayControl evr)
        {
            InitializeComponent();
            _evr = evr;
            _isInit = false;
            _filterName = caption;

            this.Resize += new EventHandler(VideoInternalWindow_Resize);
            this.Paint += new PaintEventHandler(VideoInternalWindow_Paint);
            this.MouseMove += new MouseEventHandler(VideoInternalWindow_MouseMove);
            this.MouseDown += new MouseEventHandler(VideoInternalWindow_MouseDown);
        }

        /// <summary>
        /// Gets or sets the IDvdControl2 associated with this Video Window
        /// </summary>
        public IDvdControl2 DVDControl
        {
            get
            {
                return _dvdControl;
            }
            set
            {
                _dvdControl = value;

                // show/hide the dvd control button
                (this.Parent.Parent as DSFilterNodeUI).dvdControlbutton.Visible = (value == null) ? false : true;
            }
        }

        protected override void OnVisibleChanged(EventArgs e)
        {
            base.OnVisibleChanged(e);
            if (_delayedInit)
            {
                // we had to delay the init of the EVR's Video Window until it was made visible
                _delayedInit = false;
                _isInit = false;
                InitVideoWindow();
            }
        }
        /// <summary> 
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }

            if (_vw != null)
            {
                int hr = _vw.put_Owner(IntPtr.Zero);
                _vw = null;
            }

            if (_evr != null)
            {
                try
                {
                    _evr.SetVideoWindow(IntPtr.Zero);
                }
                catch (Exception ex)
                {
#if DEBUG
                    MessageBox.Show(ex.Message, "Failed to reset EVR Window");
#endif
                }
                finally
                {
                    _evr = null;
                }
            }

            if (_detachedWindow != null)
            {
                _detachedWindow.Close();
            }

            base.Dispose(disposing);
        }

        public void InitVideoWindow()
        {
            InitVideoWindow(this.Handle);
        }

        private void InitVideoWindow(IntPtr handle)
        {
            int hr = 0;
            if (!_isInit)
            {
                _isInit = true;

                if (_vw != null)
                {
                    hr = _vw.put_Owner(handle);
                    if (hr != 0)
                    {
                        return;
                    }

                    hr = _vw.put_WindowStyle(WindowStyle.Child | WindowStyle.ClipSiblings | WindowStyle.ClipChildren);
                    _vw.put_MessageDrain(Handle);
                    if (hr != 0)
                    {
                        return;
                    }
                }
                else if (_evr != null)
                {
                    if (!_delayedInit)
                    {
                        try
                        {
                            _evr.SetVideoWindow(handle);
                        }
                        catch (Exception ex)
                        {                            
                            _isInit = false;
                            _delayedInit = true;
                        }
                    }
                }                
            }
            OnResize(new EventArgs());
        }

        public Form DetachVideoWindow(bool fullscreen)
        {
            if (!_isInit) return null;

            //if we're already deteched, close the form
            if (_detachedWindow != null)
            {
                _detachedWindow.Close();
                return null;
            }

            _detachedWindow = new DetachedVideoWindow(this);
            _detachedWindow.Size = new Size(320, 240);
            _detachedWindow.BackColor = Color.Black;
            _detachedWindow.Text = _filterName;
            _detachedWindow.FormClosing += new FormClosingEventHandler(_detachedWindow_FormClosing);
            _detachedWindow.Resize += new EventHandler(VideoInternalWindow_Resize);
            _detachedWindow.Paint += new PaintEventHandler(VideoInternalWindow_Paint);
            _detachedWindow.MouseMove += new MouseEventHandler(VideoInternalWindow_MouseMove);
            _detachedWindow.MouseDown += new MouseEventHandler(VideoInternalWindow_MouseDown);
            _detachedWindow.Icon = (this.TopLevelControl as Form).Icon;

            // if we're going full screen, we're going to fake the funk with a fullscreen window
            if (fullscreen)
            {
                _detachedWindow.FullScreen = true;
            }
            _detachedWindow.Show(this.TopLevelControl);
            
            // reset the video initialization
            _isInit = false;
            InitVideoWindow(_detachedWindow.Handle);

            // if it's a vmr7 or vmr9, sned it's message drain through the detached window
            if (_vw != null)
            {
                int hr = _vw.put_MessageDrain(_detachedWindow.Handle);
            }

            return _detachedWindow;
        }

        #region Events

        protected override void WndProc(ref Message m)
        {
            if (m.Msg == 2) // Catch WM_Destroy to reassign the VideoWindow owner
            {
                if (_detachedWindow == null && _vw != null)
                {
                    // The EVR easily handles this, but VMR7 and VMR9 parent windows have to be reset
                    // when they lose the Handle.
                    _vw.put_Visible(OABool.False);
                    _vw.put_Owner(IntPtr.Zero);                    
                }
                _handleLost = true;
            }

            base.WndProc(ref m);

            if (m.Msg == 1)
            {
                if (_handleLost)
                {
                    if (_detachedWindow == null)
                    {
                        // the window handle was lost (probably due to docking).  Reinit with the new handle                
                        _isInit = false;
                        InitVideoWindow(this.Handle);
                        if (_vw != null)
                        {
                            _vw.put_Visible(OABool.True);
                        }
                    }
                    _handleLost = false;
                }
            }

            if (m.Msg == 0x203) //WM_LBUTTONDBLCLK
            {
                this.VideoInternalWindow_DoubleClick(this, new EventArgs());
            }
        }

        void VideoInternalWindow_Paint(object sender, PaintEventArgs e)
        {
            if (_evr != null && _isInit)
            {
                try
                {
                    _evr.RepaintVideo();
                }
                catch
                {
                    // evr is not connected
                }
            }
        }

        void VideoInternalWindow_Resize(object sender, EventArgs e)
        {
            int top = 0;
            int left = 0;
            int width = this.Width;
            int height = this.Height;

            if (_detachedWindow != null)
            {
                top = _detachedWindow.ClientRectangle.Top;
                left = _detachedWindow.ClientRectangle.Left;
                width = _detachedWindow.ClientRectangle.Width;
                height = _detachedWindow.ClientRectangle.Height;
            }

            if (_isInit)
            {
                if (_vw != null)
                {
                    _vw.SetWindowPosition(top, left, width, height);
                }
                else if (_evr != null & !_delayedInit)
                {
                    try
                    {
                        RECT rcDest = new RECT();
                        MFVideoNormalizedRect nRect = new MFVideoNormalizedRect();

                        nRect.left = 0;
                        nRect.right = 1;
                        nRect.top = 0;
                        nRect.bottom = 1;
                        rcDest.left = top;
                        rcDest.top = left;
                        rcDest.right = width;
                        rcDest.bottom = height;

                        _evr.SetVideoPosition(nRect, rcDest);
                    }
                    catch (Exception ex)
                    {
#if DEBUG
                        MessageBox.Show(ex.Message, "Failed to set EVR Window Position");
#endif
                    }
                }
            }
        }

        void _detachedWindow_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (_evr != null || _vw != null)
            {
                // put the video window back to this control
                _isInit = false;
                InitVideoWindow(this.Handle);
            }

            _detachedWindow.Dispose();
            _detachedWindow = null;

            // force resize to repaint the frame of video in the Node
            VideoInternalWindow_Resize(null, null);
        }

        void VideoInternalWindow_MouseDown(object sender, MouseEventArgs e)
        {
            if (_dvdControl == null || (sender == this && _detachedWindow != null))
            {
                // ignore the internal window if there is a detached window
                return;
            }
            _dvdControl.ActivateAtPosition(e.Location);
        }

        void VideoInternalWindow_MouseMove(object sender, MouseEventArgs e)
        {
            if (_dvdControl == null || (sender == this && _detachedWindow != null))
            {
                // ignore the internal window if there is a detached window
                return;
            }
            _dvdControl.SelectAtPosition(e.Location);
        }

        public void ToggleFullScreen()
        {
            if (_isFullScreen)
            {
                _detachedWindow.FullScreen = false;
                _isFullScreen = false;
            }
            else
            {
                if (_detachedWindow != null)
                {
                    _detachedWindow.FullScreen = true;
                    _isFullScreen = true;
                }
                else
                {
                    DetachVideoWindow(true);
                    _isFullScreen = true;
                }
            }
        }

        void VideoInternalWindow_DoubleClick(object sender, EventArgs e)
        {
            ToggleFullScreen();
        }

        #endregion
    }

    internal class DetachedVideoWindow : Form
    {
        private VideoInternalWindow _parent;
        private bool _isFullScreen = false;

        public DetachedVideoWindow(VideoInternalWindow parent)
        {
            _parent = parent;
        }

        public bool FullScreen
        {
            get
            {
                return _isFullScreen;
            }
            set
            {
                if (value)
                {
                    this.FormBorderStyle = FormBorderStyle.None;
                    this.WindowState = FormWindowState.Maximized;
                    this.TopMost = true;
                }
                else
                {
                    this.WindowState = FormWindowState.Normal;
                    this.TopMost = false;
                    this.FormBorderStyle = FormBorderStyle.Sizable;
                }
                _isFullScreen = value;
            }
        }

        protected override void OnKeyPress(KeyPressEventArgs e)
        {
            base.OnKeyPress(e);
            if (e.KeyChar == (char)0x1b && _isFullScreen)
            {
                _parent.ToggleFullScreen();
            }
        }

        protected override void WndProc(ref Message m)
        {
            base.WndProc(ref m);

            if (m.Msg == 0x203) //WM_LBUTTONDBLCLK
            {
                _parent.ToggleFullScreen();
            }
        }
    }
}

By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.

If a file you wish to view isn't highlighted, and is a text file (not binary), please let us know and we'll add colourisation support for it.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Share

About the Author

JohnnyLocust
Software Developer (Senior) Haivision Network Video
United States United States
AKA Rich Insley.

I have over 25 years experience in programming, and I'm completely self taught. (Except for one year at California State University Fresno where I had to learn the God awful language Miranda (http://miranda.org.uk/). I've spent 10 years as a Paratrooper in the US Army during the Clinton Administration.

You may also be interested in...

| Advertise | Privacy | Terms of Use | Mobile
Web02 | 2.8.160730.1 | Last Updated 20 Dec 2007
Article Copyright 2007 by JohnnyLocust
Everything else Copyright © CodeProject, 1999-2016
Layout: fixed | fluid