ImageInfo.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CommonUI / System / Drawing / ImageInfo.cs / 1 / ImageInfo.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 
namespace System.Drawing {
    using System.Threading; 
 
    using System;
    using System.Diagnostics; 
    using System.Drawing.Imaging;

    /// 
    ///     Animates one or more images that have time-based frames. 
    ///     This file contains the nested ImageInfo class - See ImageAnimator.cs for the definition of the outer class.
    ///  
    public sealed partial class ImageAnimator { 
        /// 
        ///     ImageAnimator nested helper class used to store extra image state info. 
        /// 
        private class ImageInfo {
            const int PropertyTagFrameDelay = 0x5100;
 
            Image image;
            int frame; 
            int frameCount; 
            bool frameDirty;
            bool animated; 
            EventHandler onFrameChangedHandler;
            int[] frameDelay;
            int frameTimer;
 
            /// 
            ///  
            public ImageInfo(Image image) { 
                this.image = image;
                animated = ImageAnimator.CanAnimate(image); 

                if (animated) {
                    frameCount = image.GetFrameCount(FrameDimension.Time);
 
                    PropertyItem frameDelayItem = image.GetPropertyItem(PropertyTagFrameDelay);
 
                    // If the image does not have a frame delay, we just return 0. 
                    //
                    if (frameDelayItem != null) { 
                        // Convert the frame delay from byte[] to int
                        //
                        byte[] values = frameDelayItem.Value;
                        Debug.Assert(values.Length == 4 * FrameCount, "PropertyItem has invalid value byte array"); 
                        frameDelay = new int[FrameCount];
                        for (int i=0; i < FrameCount; ++i) { 
                            frameDelay[i] = values[i * 4] + 256 * values[i * 4 + 1] + 256 * 256 * values[i * 4 + 2] + 256 * 256 * 256 * values[i * 4 + 3]; 
                        }
                    } 
                }
                else {
                    frameCount = 1;
                } 
                if (frameDelay == null) {
                    frameDelay = new int[FrameCount]; 
                } 
            }
 
            /// 
            ///     Whether the image supports animation.
            /// 
            public bool Animated { 
                get {
                    return animated; 
                } 
            }
 
            /// 
            ///     The current frame.
            /// 
            public int Frame { 
                get {
                    return frame; 
                } 
                set {
                    if (frame != value) { 
                        if (value < 0 || value >= FrameCount) {
                            throw new ArgumentException(SR.GetString(SR.InvalidFrame), "value");
                        }
 
                        if (Animated) {
                            frame = value; 
                            frameDirty = true; 

                            OnFrameChanged(EventArgs.Empty); 
                        }
                    }
                }
            } 

            ///  
            ///     The current frame has not been updated. 
            /// 
            public bool FrameDirty { 
                get {
                    return frameDirty;
                }
            } 

            ///  
            ///  
            public EventHandler FrameChangedHandler {
                get { 
                    return onFrameChangedHandler;
                }
                set {
                    onFrameChangedHandler = value; 
                }
            } 
 
            /// 
            ///     The number of frames in the image. 
            /// 
            public int FrameCount {
                get {
                    return frameCount; 
                }
            } 
 
            /// 
            ///     The delay associated with the frame at the specified index. 
            /// 
            public int FrameDelay(int frame) {
                return frameDelay[frame];
            } 

            ///  
            ///  
            internal int FrameTimer {
                get { 
                    return frameTimer;
                }
                set {
                    frameTimer = value; 
                }
            } 
 
            /// 
            ///     The image this object wraps. 
            /// 
            internal Image Image {
                get {
                    return image; 
                }
            } 
 
            /// 
            ///     Selects the current frame as the active frame in the image. 
            /// 
            internal void UpdateFrame() {
                if (frameDirty) {
                    image.SelectActiveFrame(FrameDimension.Time, Frame); 
                    frameDirty = false;
                } 
            } 

            ///  
            ///     Raises the FrameChanged event.
            /// 
            protected void OnFrameChanged(EventArgs e) {
                if( this.onFrameChangedHandler != null ){ 
                    this.onFrameChangedHandler(image, e);
                } 
            } 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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