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();
//<gridControl1>
realTimeSource = CreateRealTimeSource();
gridControl1.DataSource = realTimeSource;
//</gridControl1>
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();
//<gridControl1>
realTimeSource.DataSource = chtr.List;
//</gridControl1>
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<string> 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<MarketData> collection = new BindingList<MarketData>();

    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。