Devexpress中的实时Grid和precessBar的学习笔记

正在实现一个调度界面，本身用到了TreeList示例。

用的是11版的：WinForms\XtraTreeList\CS\TreeListMainDemo

现在，我想了解一下最新的技术，特别是实时变更工具条的部分。

DevExpress-13.2.6 中，找到一个grid的实时示例：

C:\Users\Public\Documents\DevExpress Demos 13.2\Components\WinForms\CS\GridMainDemo\bin\Debug

我们这次分析，两个重点：

1. 如何在gridview中加入一列，显示进度条。

2. 进度条如何动态改变

启动后，我们先来看看，如何填加后面的工具条：

namespace DevExpress.XtraGrid.Demos {
    public partial class RealTimeSourceDemo : TutorialControl {
        public RealTimeSourceDemo() {
            InitializeComponent();
            TutorialInfo.WhatsThisCodeFile = "CS\\GridMainDemo\\Modules\\RealTimeSource.cs";
            TutorialInfo.WhatsThisXMLFile = "DevExpress.XtraGrid.Demos.CodeInfo.RealTimeSource.xml";
            editorProgressBar = new RepositoryItemProgressBar { Minimum = 300, Maximum = 1000, ShowTitle = true, PercentView = false };
        }

            editorProgressBar = new RepositoryItemProgressBar { Minimum = 300, Maximum = 1000, ShowTitle = true, PercentView = false };

        protected override void DoShow() {
            base.DoShow();
            isHide = false;
            syncContext = SynchronizationContext.Current;
            chtr = new ChangeThread(syncContext);
            trackBar1.Value = 10;
            PatchInterval();
            //
            realTimeSource = CreateRealTimeSource();
            gridControl1.DataSource = realTimeSource;
            //
            timerShow = new Timer(TimerShowCallback, null, 0, 500);
            backgroundTimer = new Timer(chtr.OnIdle, null, TimeSpan.Zero, TimeSpan.FromMilliseconds(10));
            this.Disposed += RealTimeSourceDemo_Disposed;
            chartControl1.Series["UPSDiagram"].Points.Clear();
            tr = new Thread(chtr.Do);
            tr.IsBackground = true;
            tr.Start();
            //
            realTimeSource.DataSource = chtr.List;
            //
            gridView1.GridControl.RepositoryItems.AddRange(new RepositoryItem[] { editorProgressBar });
        }

 gridView1.GridControl.RepositoryItems.AddRange(new RepositoryItem[] { editorProgressBar });

        private void gridView1_DataSourceChanged(object sender, EventArgs e) {
            GridColumn column = gridView1.Columns["DayVal"];
            if(column == null || editorProgressBar == null)
                return;
            column.ColumnEdit = editorProgressBar;
        }

column.ColumnEdit = editorProgressBar;

在这里下断，因为可以肯定，是需要改变这个值的。

 public class MarketData {

        double dayVal;
        public double DayVal {
            get { return Math.Round(dayVal, 1); }
            private set { dayVal = value; }
        }

    }

找到：

        public void Do() {
            Random rndRow = new Random();
            int postedOperation = 0;
            do {

                Stopwatch watch = Stopwatch.StartNew();
                int row = rndRow.Next(0, collection.Count);
                lock(lockObj) {
                    if(!useRealtimeSource) {
                        Interlocked.Increment(ref postedOperation);
                        context.Post((x) => {
                            collection[row].Update();
                            collection.ResetItem(row);
                            Interlocked.Decrement(ref postedOperation);
                        }, null);
                    } else {
                        collection[row].Update();
                        collection.ResetItem(row);
                    }
                }

把这句注释掉后，启动，发现界面果然静止了。

那么，这里也就是我们要调研的第二个重点。

最难懂的就是这句：

realTimeSource.DataSource = chtr.List;

后面没看明白。

    [DXToolboxItem(true)]
    [ToolboxBitmap(typeof(ResFinder), "Bitmaps256.RealTimeSource.bmp")]
    [Designer("DevExpress.Xpo.Design.RealtimeSourceDesigner, DevExpress.Xpo.v13.2.Design")]
    [ToolboxTabName("DX.13.2: Data & Analytics")]
    public class RealTimeSource : Component, IListSource, IDXCloneable
    {
        public static int SendQueueTimeout;

        public RealTimeSource();

        [RefreshProperties(RefreshProperties.All)]
        [Category("Data")]
        [AttributeProvider(typeof(IListSource))]
        [DefaultValue("")]
        public object DataSource { get; set; }
        [RefreshProperties(RefreshProperties.All)]
        [Editor("DevExpress.Design.RealTimeSourcePropertiesEditor, DevExpress.Design.v13.2", "System.Drawing.Design.UITypeEditor, System.Drawing")]
        public string DisplayableProperties { get; set; }
        [DefaultValue(false)]
        public bool IgnoreItemEvents { get; set; }
        [Browsable(false)]
        public bool UseWeakEventHandler { get; set; }

        public void CatchUp();
        protected override void Dispose(bool disposing);
        protected virtual object DXClone();
        protected virtual RealTimeSource DXCloneCreate();
        public static IEnumerable GetDisplayableProperties(object source);
        public IList GetList();
        public TimeSpan GetQueueDelay();
        public void Resume();
        public void Suspend();
    }

     

chtr = new ChangeThread(syncContext);

 RealTimeSource rts = new RealTimeSource();

realTimeSource.DataSource = chtr.List;

这个就是那个list

readonly BindingList collection = new BindingList();

    public class MarketData {
        readonly static Random rnd = new Random();
        const double MAX = 950;
        const double MIN = 350;
        public string Ticker { get; private set; }
        double last;
        public double Last {
            get { return Math.Round(last, 1); }
            private set { last = value; }
        }
        double chgPercent;
        public double ChgPercent {
            get { return Math.Round(chgPercent * 100, 2); }
            private set { chgPercent = value; }
        }
        double open;
        public double Open {
            get { return Math.Round(open, 1); }
            private set { open = value; }
        }
        double high;
        public double High {
            get { return Math.Round(high, 1); }
            private set { high = value; }
        }
        double low;
        public double Low {
            get { return Math.Round(low, 1); }
            private set { low = value; }
        }
        public DateTime Date;
        public string Time {
            get { return Date.ToLongTimeString(); }
        }
        double dayVal;
        public double DayVal {
            get { return Math.Round(dayVal, 1); }
            private set { dayVal = value; }
        }

没有完全看明白。但它就是能工作。

上面的属性，最终是如何映射到界面上的。