SchedulerControl.QueryResourceColorSchema Event

Enables visible resources to be painted according to certain conditions.

Namespace : DevExpress.XtraScheduler

Assembly : DevExpress.XtraScheduler.v25.2.dll

NuGet Package : DevExpress.Win.Scheduler

Declaration

C#
VB.NET

csharp

public event QueryResourceColorSchemaEventHandler QueryResourceColorSchema

Public Event QueryResourceColorSchema As QueryResourceColorSchemaEventHandler

Event Data

The QueryResourceColorSchema event's data class is QueryResourceColorSchemaEventArgs. The following properties provide information specific to this event:

Property	Description
Resource	Gets the resource for which the color schema is queried.
ResourceColorIndex	Gets the index of the processed resource’s color schema in a SchedulerColorSchemaCollection collection.
ResourceColorSchema	Gets or sets a color schema to be used for a visible resource coloring.

Remarks

By default, if you change a set of visible resources (for example, by using resource filter controls) the collection of resource color schemas will remain unchanged (SchedulerControl.GetResourceColorSchemasCopy), i.e. the same color schemas in the same order will be used to paint resources newly selected for display in the scheduler.

However, you can assign a specific color schema to each resource to be displayed. To do this, handle the QueryResourceColorSchema event.

The QueryResourceColorSchema event is raised before a resource to be displayed in the scheduler is painted. The event parameter’s QueryResourceColorSchemaEventArgs.Resource property provides information on a processed resource. To associate this resource with a required color schema, use the QueryResourceColorSchemaEventArgs.ResourceColorSchema property.

The QueryResourceColorSchema event can be helpful, if it is required to paint resources according to certain conditions (for example, to highlight a selected resource or specify a certain color schema for a resource, depending on its custom field value, etc.).

Example

This example demonstrates how to link a specific SchedulerColorSchema to each visible resource.

Call the SchedulerControl.GetResourceColorSchemasCopy method to obtain a collection of color schemas that are currently available for resource coloring (according to the currently active skin) and handle the SchedulerControl.QueryResourceColorSchema event to associate a specific color schema from the obtained collection to each resource displayed in the scheduler control.

C#
VB.NET

csharp

using DevExpress.XtraScheduler;
using System.Collections.Generic;
// ...

namespace QueryResourceColorSchema {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
            AddResources();

            // Get copies of color schemas that are curremnty used to paint resources.
            PrepareResourceColorSchemas();

            schedulerControl1.LookAndFeel.StyleChanged += new EventHandler(LookAndFeel_StyleChanged);
        }

        void LookAndFeel_StyleChanged(object sender, EventArgs e) {
            // Get copies of color schemas to be used to paint resources
            // after the active skin has been changed.
            PrepareResourceColorSchemas();

            schedulerControl1.ActiveView.LayoutChanged();
        }

        // ...

        Dictionary<object, SchedulerColorSchema> resourceColorSchemas = 
            new Dictionary<object, SchedulerColorSchema>();

        private void PrepareResourceColorSchemas() {
            this.resourceColorSchemas.Clear();
            int count = Resources.Count;
            SchedulerColorSchemaCollection currentColorSchemas = 
                schedulerControl1.GetResourceColorSchemasCopy();
            int schemaCount = currentColorSchemas.Count;
            for (int i = 0; i < count; i++) {
                Resource resource = schedulerControl1.Storage.Resources[i];
                this.resourceColorSchemas.Add(resource.Id, currentColorSchemas[i % schemaCount]);
            }
        }

        private void schedulerControl1_QueryResourceColorSchema(object sender, 
                                                                QueryResourceColorSchemaEventArgs e) {
            object key = e.Resource.Id;
            if (this.resourceColorSchemas.ContainsKey(key))
                e.ResourceColorSchema = this.resourceColorSchemas[key];
        }
    }
}

Imports DevExpress.XtraScheduler
Imports System.Collections.Generic
' ...

Namespace QueryResourceColorSchema
    Partial Public Class Form1
        Inherits Form
        Public Sub New()
            InitializeComponent()
            AddResources()

            ' Get copies of color schemas that are curremnty used to paint resources.
            PrepareResourceColorSchemas()

            AddHandler schedulerControl1.LookAndFeel.StyleChanged, AddressOf LookAndFeel_StyleChanged
        End Sub

        Private Sub LookAndFeel_StyleChanged(ByVal sender As Object, ByVal e As EventArgs)
            ' Get copies of color schemas to be used to paint resources after the active skin has been changed.
            PrepareResourceColorSchemas()

            schedulerControl1.ActiveView.LayoutChanged()
        End Sub

        Private resourceColorSchemas As Dictionary(Of Object, SchedulerColorSchema) = _
                                                    New Dictionary(Of Object, SchedulerColorSchema)()

        ' ...

        Private Sub PrepareResourceColorSchemas()
            Me.resourceColorSchemas.Clear()
            Dim count As Integer = Resources.Count
            Dim currentColorSchemas As SchedulerColorSchemaCollection = _
                                       schedulerControl1.GetResourceColorSchemasCopy()
            Dim schemaCount As Integer = currentColorSchemas.Count
            For i As Integer = 0 To count - 1
                Dim resource As Resource = schedulerControl1.Storage.Resources(i)
                Me.resourceColorSchemas.Add(resource.Id, currentColorSchemas(i Mod schemaCount))
            Next i
        End Sub
        Private Sub schedulerControl1_QueryResourceColorSchema(ByVal sender As Object, _
                            ByVal e As QueryResourceColorSchemaEventArgs) _
                            Handles schedulerControl1.QueryResourceColorSchema
            Dim key As Object = e.Resource.Id
            If Me.resourceColorSchemas.ContainsKey(key) Then
                e.ResourceColorSchema = Me.resourceColorSchemas(key)
            End If
        End Sub
    End Class
End Namespace