blazor-devexpress-dot-blazor-dot-dxtreelist-443dad82.md
Collapses all rows in the TreeList component.
Namespace : DevExpress.Blazor
Assembly : DevExpress.Blazor.v25.2.dll
NuGet Package : DevExpress.Blazor
public void CollapseAll()
Call the ExpandAll or CollapseAll method to expand or collapse all rows in the TreeList component. To expand or collapse a specific row, pass the row’s visible index to the ExpandRow or CollapseRow method. The IsRowExpanded method returns whether a row with the specified visible index is expanded.
Enable the AutoExpandAllNodes property to automatically expand TreeList rows when the TreeList loads data.
The TreeList component does not support ExpandAll() and CollapseAll methods when it bound to server-mode data or loads data on demand.
The following example displays Expand All and Collapse All buttons in the TreeList toolbar:
@inject SpaceObjectDataProvider SpaceObjectDataProvider
<DxTreeList @ref="TreeList" Data="TreeListData" ChildrenFieldName="Satellites">
<Columns>
<DxTreeListDataColumn FieldName="Name" />
<DxTreeListDataColumn FieldName="TypeOfObject" Caption="Type" />
<DxTreeListDataColumn FieldName="Mass10pow21kg" Caption="Mass, kg" DisplayFormat="N2">
<HeaderCaptionTemplate>Mass, 10<sup>21</sup> × kg</HeaderCaptionTemplate>
</DxTreeListDataColumn>
<DxTreeListDataColumn FieldName="MeanRadiusInKM" Caption="Radius, km" DisplayFormat="N2"/>
<DxTreeListDataColumn FieldName="Volume10pow9KM3" DisplayFormat="N2">
<HeaderCaptionTemplate>Volume, 10<sup>9</sup> × km<sup>3</sup></HeaderCaptionTemplate>
</DxTreeListDataColumn>
<DxTreeListDataColumn FieldName="SurfaceGravity" DisplayFormat="N2">
<HeaderCaptionTemplate>Gravity, m/s<sup>2</sup></HeaderCaptionTemplate>
</DxTreeListDataColumn>
</Columns>
<ToolbarTemplate>
<DxToolbar>
<Items>
<DxToolbarItem Text="Expand All" Click="() => TreeList.ExpandAll()" />
<DxToolbarItem Text="Collapse All" Click="() => TreeList.CollapseAll()" />
</Items>
</DxToolbar>
</ToolbarTemplate>
</DxTreeList>
@code {
ITreeList TreeList { get; set; }
object TreeListData { get; set; }
protected override async Task OnInitializedAsync() {
TreeListData = SpaceObjectDataProvider.GenerateData();
}
}
using System.Collections.Generic;
public class SpaceObject {
public string Name { get; set; }
public double MeanRadiusInKM { get; set; }
public double Volume10pow9KM3 { get; set; }
public double Mass10pow21kg { get; set; }
public double Density { get; set; }
public double SurfaceGravity { get; set; }
public string TypeOfObject { get; set; }
public List<SpaceObject> Satellites { get; set; }
public SpaceObject(
string name,
double meanRadiusInKM,
double volume10pow9KM3,
double mass10pow21kg,
double density,
double surfaceGravity,
string typeOfObject,
List<SpaceObject> satellites = null
) {
Name = name;
MeanRadiusInKM = meanRadiusInKM;
Volume10pow9KM3 = volume10pow9KM3;
Mass10pow21kg = mass10pow21kg;
Density = density;
SurfaceGravity = surfaceGravity;
TypeOfObject = typeOfObject;
Satellites = satellites ?? new List<SpaceObject>();
}
}
public class SpaceObjectDataProvider {
public List<SpaceObject> GenerateData() {
return new List<SpaceObject>() {
new SpaceObject("Sun", 696000, 1412000000, 1989100000, 1.409, 274.0, "Star", new List<SpaceObject>() {
new SpaceObject("Mercury", 2439.7, 60.83, 330.2, 5.43, 3.7, "Planet"),
new SpaceObject("Venus", 6051.8, 928.43, 4868.5, 5.24, 8.872, "Planet"),
new SpaceObject("Earth", 6371.0, 1083.21, 5973.6, 5.515, 9.78033, "Planet", new List<SpaceObject> () {
new SpaceObject("Moon", 1737.1, 21.958, 73.5, 3.3464, 1.625, "Satellite")
}),
new SpaceObject("Mars", 3390.0, 163.18, 641.85, 3.94, 3.7, "Planet"),
new SpaceObject("Jupiter", 69911, 1431280, 1898600, 1.33, 24.79, "Planet", new List<SpaceObject>() {
new SpaceObject("Ganymede", 2631.2, 76.30, 148.2, 1.936, 1.428, "Satellite"),
new SpaceObject("Callisto", 2410.3, 58.65, 107.6, 1.83, 1.23603, "Satellite"),
new SpaceObject("Io", 1821.5, 25.32, 89.3, 3.528, 1.797, "Satellite"),
new SpaceObject("Europa", 1561, 15.93, 48, 3.01, 1.316, "Satellite"),
}),
new SpaceObject("Saturn", 58232, 827130, 568460, 0.70, 10.445, "Planet", new List<SpaceObject>() {
new SpaceObject("Titan", 2576, 71.52, 134.5, 1.88, 1.354, "Satellite"),
new SpaceObject("Rhea", 764.4, 1.87, 2.3166, 1.23, 0.26, "Satellite"),
new SpaceObject("Iapetus", 736, 1.55, 1.9739, 1.08, 0.223, "Satellite"),
new SpaceObject("Dione", 561.6, 0.73, 1.096, 1.48, 0.232, "Satellite"),
new SpaceObject("Tethys", 533, 0.624, 0.6173, 1.15, 0.145, "Satellite"),
new SpaceObject("Enceladus", 252.1, 0.067, 0.108, 1.61, 0.111, "Satellite"),
new SpaceObject("Mimas", 198.3, 0.033, 0.03749, 1.15, 0.06363, "Satellite")
}),
new SpaceObject("Uranus", 25362, 68340, 86832, 1.30, 8.87, "Planet", new List<SpaceObject>() {
new SpaceObject("Titania", 788.9, 2.06, 3.526, 1.72, 0.378, "Satellite"),
new SpaceObject("Oberon", 761.4, 1.85, 3.014, 1.63, 0.347, "Satellite"),
new SpaceObject("Umbriel", 584.7, 0.84, 1.2, 1.4, 0.234, "Satellite"),
new SpaceObject("Ariel", 578.9, 0.81, 1.35, 1.67, 0.269, "Satellite"),
new SpaceObject("Miranda", 235.8, 0.055, 0.0659, 1.20, 0.07910375, "Satellite"),
}),
new SpaceObject("Neptune", 24622, 62540, 102430, 1.76, 11.15, "Planet", new List<SpaceObject>() {
new SpaceObject("Triton", 1353.4, 10.38, 21.5, 2.061, 0.782, "Satellite"),
new SpaceObject("Proteus", 210, 0.038, 0.050, 1.3, 0.0666, "Satellite"),
}),
new SpaceObject("Eris", 1170, 7, 16.7, 2.25, 0.662, "Dwarf planet"),
new SpaceObject("Pluto", 1153, 7.15, 13.105, 2.0, 0.61, "Dwarf planet"),
new SpaceObject("Makemake", 710, 1.8, 3, 2.0, 0.4, "Dwarf planet"),
new SpaceObject("Haumea", 575, 1.3, 4.006, 3, 0.44, "Dwarf planet"),
new SpaceObject("Ceres", 475, 0.437, 0.95, 2.08, 0.27, "Dwarf planet"),
new SpaceObject("Pallas", 266, 0.078, 0.211, 2.8, 0.2, "Asteroid"),
new SpaceObject("Vesta", 264.6, 0.078, 0.262, 3.42, 0.251, "Asteroid")
})
};
}
}
// ...
builder.Services.AddSingleton<SpaceObjectDataProvider>();
See Also