如何動態(tài)更新添加到Splash表單的自定義控件

立即下載DevExpress WinForms

在這個例子中，一個自定義的進度條控件被添加到啟動界面，該示例展示了如何通過從啟動界面管理器發(fā)送命令來動態(tài)更新此進度條控件。啟動界面由啟動界面管理器在單獨的線程中顯示，與啟動界面的交互可以通過命令機制執(zhí)行，您通過SplashScreenManager.SendCommand方法發(fā)送命令，并通過覆蓋SplashScreen.ProcessCommand方法來處理此命令。 在該示例中，自定義命令被發(fā)送到啟動界面來推進啟動界面的進度條控件的進度。

注意：完整的示例項目位于https://github.com/DevExpress-Examples/how-to-interact-with-a-splash-screen-by-sending-commands-e3576。

SplashScreen1.cs：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using DevExpress.XtraSplashScreen;

namespace SplashScreen_ProcessCommand {
public partial class SplashScreen1 : SplashScreen {
public SplashScreen1() {
InitializeComponent();
}

#region Overrides

public override void ProcessCommand(Enum cmd, object arg) {
base.ProcessCommand(cmd, arg);
SplashScreenCommand command = (SplashScreenCommand)cmd;
if (command == SplashScreenCommand.SetProgress) {
int pos = (int)arg;
progressBarControl1.Position = pos;
}
}

#endregion

public enum SplashScreenCommand {
SetProgress,
Command2,
Command3
}
}
}

Form1.cs：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using DevExpress.XtraSplashScreen;
using System.Threading;

namespace SplashScreen_ProcessCommand {
public partial class Form1 : Form {
public Form1() {
InitializeComponent();
}

private void btnShowSplashScreen_Click(object sender, EventArgs e) {
// Open a Splash Screen
SplashScreenManager.ShowForm(this, typeof(SplashScreen1), true, true, false);

// The splash screen will be opened in a separate thread. To interact with it, use the SendCommand method.
for (int i = 1; i <= 100; i++) {
SplashScreenManager.Default.SendCommand(SplashScreen1.SplashScreenCommand.SetProgress, i);
//To process commands, override the SplashScreen.ProcessCommand method.
Thread.Sleep(25);
}

// Close the Splash Screen.
SplashScreenManager.CloseForm(false);
}
}
}

Form1.vb:

Imports Microsoft.VisualBasic
Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
Imports System.Drawing
Imports System.Linq
Imports System.Text
Imports System.Windows.Forms
Imports DevExpress.XtraSplashScreen
Imports System.Threading

Namespace SplashScreen_ProcessCommand
Partial Public Class Form1
Inherits Form
Public Sub New()
InitializeComponent()
End Sub

Private Sub btnShowSplashScreen_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnShowSplashScreen.Click
' Open a Splash Screen
SplashScreenManager.ShowForm(Me, GetType(SplashScreen1), True, True, False)

' The splash screen will be opened in a separate thread. To interact with it, use the SendCommand method.
For i As Integer = 1 To 100
SplashScreenManager.Default.SendCommand(SplashScreen1.SplashScreenCommand.SetProgress, i)
'To process commands, override the SplashScreen.ProcessCommand method.
Thread.Sleep(25)
Next i

' Close the Splash Screen.
SplashScreenManager.CloseForm(False)
End Sub
End Class
End Namespace

SplashScreen1.vb：

Imports Microsoft.VisualBasic
Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
Imports System.Drawing
Imports System.Text
Imports System.Windows.Forms
Imports DevExpress.XtraSplashScreen

Namespace SplashScreen_ProcessCommand
Partial Public Class SplashScreen1
Inherits SplashScreen
Public Sub New()
InitializeComponent()
End Sub

#Region "Overrides"

Public Overrides Sub ProcessCommand(ByVal cmd As System.Enum, ByVal arg As Object)
MyBase.ProcessCommand(cmd, arg)
Dim command As SplashScreenCommand = CType(cmd, SplashScreenCommand)
If command = SplashScreenCommand.SetProgress Then
Dim pos As Integer = CInt(Fix(arg))
progressBarControl1.Position = pos
End If
End Sub

#End Region

Public Enum SplashScreenCommand
SetProgress
Command2
Command3
End Enum
End Class
End Namespace