NavBarControl.LargeImages Property
Gets or sets an object that serves as the source of large images used in the NavBarControl.
Namespace: DevExpress.XtraNavBar
Assembly: DevExpress.XtraNavBar.v24.1.dll
NuGet Packages: DevExpress.Win, DevExpress.Win.Navigation
Declaration
Property Value
| Type | Default | Description |
|---|---|---|
| Object | null | An object that is an image collection providing large images for the NavBarControl’s items. |
Remarks
Use the LargeImages property to specify the source of large images that can be displayed in group headers and links.
Once the image source has been assigned, use the element’s NavElement.LargeImageIndex property to assign the required large image from this list to an item/group.
The NavBar can also display small images within its elements. To specify which images should be displayed in group headers and links, use the NavBarGroup.GroupCaptionUseImage and NavBarGroup.GroupStyle properties, respectively.
The LargeImages property accepts the following image collections:
- ImageCollection - Supports image transparency.
- SharedImageCollection - Supports image transparency. Allows you to share images between controls within multiple forms.
- SvgImageCollection - Stores vector icons that can scale without losing their quality on high resolution devices.
- ImageList.
Example
This example shows how to create a NavBarControl in code.
The NavBarControl will have two groups (‘Charts’ and ‘Settings’) with items. Item link selection is enabled by setting the LinkSelectionMode property to LinkSelectionModeType.OneInGroupAndAllowAutoSelect. To respond to a link selection, the SelectedLinkChanged event is handled.
In the OneInGroupAndAllowAutoSelect mode, each group can have a single selected link independent of other groups. When a group is activated and it has no selected link, the first link is auto-selected. At runtime, you will see that the SelectedLinkChanged event fires on group activation, while the LinkClicked event does not.
The example demonstrates two methods of assigning images to navbar items:
Explicit assignment of Image objects to items (see the ‘Charts’ navbar group item initialization).
Implicit assignment, using image indexes (see the ‘Settings’ navbar group item initialization).
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using DevExpress.XtraNavBar;
namespace CreateNavBar {
public partial class Form1 : Form {
public Form1() {
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e) {
// Create a NavBarControl.
NavBarControl navBar = new NavBarControl();
this.Controls.Add(navBar);
navBar.Width = 150;
navBar.Dock = DockStyle.Left;
// Apply the "NavigationPaneView" style.
navBar.PaintStyleKind = NavBarViewKind.NavigationPane;
// Create the 'Charts' navbar group.
NavBarGroup groupChart = new NavBarGroup("Charts");
// Display a large image in the group caption.
groupChart.LargeImage = global::CreateNavBar.Properties.Resources.chart_32x32;
// Create an 'Area' item and assign an image to it from the project resources.
NavBarItem itemChartArea = new NavBarItem("Area");
itemChartArea.LargeImage = global::CreateNavBar.Properties.Resources.area_32x32;
// Create a 'Bar' item.
NavBarItem itemChartBar = new NavBarItem("Bar");
itemChartBar.LargeImage = global::CreateNavBar.Properties.Resources.bar_32x32;
// Create a disabled 'Refresh' item.
NavBarItem itemChartRefresh = new NavBarItem("Refresh");
itemChartRefresh.LargeImage = global::CreateNavBar.Properties.Resources.refresh_32x32;
itemChartRefresh.Enabled = false;
//Assign an image collection to the NavBarControl.
//Images from this collection are used in the 'Settings' navbar group
navBar.LargeImages = imageCollection1;
// Create the 'Settings' navbar group.
NavBarGroup groupSettings = new NavBarGroup("Settings");
// Display a large image in the group caption.
groupSettings.LargeImage = global::CreateNavBar.Properties.Resources.customize_32x32;
// Create an 'Edit Settings' item and assign a large image to it by its index in the navBar.LargeImages collection.
NavBarItem itemEditSettings = new NavBarItem("Edit Settings");
itemEditSettings.LargeImageIndex = 0;
// Create an Export item and assign a large image to it by its index in the navBar.LargeImages collection.
NavBarItem itemExport = new NavBarItem("Export");
itemExport.LargeImageIndex = 1;
// Add the created items to the groups and the groups to the NavBarControl.
// Prevent excessive updates using the BeginUpdate and EndUpdate methods.
navBar.BeginUpdate();
navBar.Groups.Add(groupChart);
groupChart.ItemLinks.Add(itemChartArea);
groupChart.ItemLinks.Add(itemChartBar);
// Add a separator.
groupChart.ItemLinks.Add(new NavBarSeparatorItem());
groupChart.ItemLinks.Add(itemChartRefresh);
//Enable the display of large images in the group.
groupChart.GroupStyle = NavBarGroupStyle.LargeIconsText;
navBar.Groups.Add(groupSettings);
groupSettings.ItemLinks.Add(itemEditSettings);
groupSettings.ItemLinks.Add(itemExport);
//Enable the display of large images in the group.
groupSettings.GroupStyle = NavBarGroupStyle.LargeIconsText;
// Activate the 'Charts' group.
navBar.ActiveGroup = groupChart;
// Specify the event handler to process item clicks.
navBar.LinkClicked += new NavBarLinkEventHandler(navBar_LinkClicked);
// Specify the event handler to process item selection.
navBar.SelectedLinkChanged += navBar_SelectedLinkChanged;
// Enable link selection.
// Each group can have a single selected link independent of other groups.
// When a group is activated and it has no selected link, the first link is auto-selected.
// At runtime, you will see that the SelectedLinkChanged event fires on group activation,
// while the LinkClicked event does not.
navBar.LinkSelectionMode = LinkSelectionModeType.OneInGroupAndAllowAutoSelect;
navBar.EndUpdate();
// Manually select the second link:
//groupChart.SelectedLinkIndex = 1;
}
void navBar_SelectedLinkChanged(object sender, DevExpress.XtraNavBar.ViewInfo.NavBarSelectedLinkChangedEventArgs e) {
string s = string.Format("'{0}' selected", e.Link.Caption);
listBoxControl1.Items.Add(s);
}
void navBar_LinkClicked(object sender, NavBarLinkEventArgs e) {
string s = string.Format("'{0}' clicked", e.Link.Caption);
listBoxControl1.Items.Add(s);
}
}
}