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   [Expand]AreaChartRangeControlClientView Class
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     CheckEdit Members
     CheckEdit Constructor
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    [Expand]CheckEdit Methods
   [Expand]CheckedListBoxControl Class
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 End-User Documentation

CheckEdit Class

Allows an end-user to select between two (checked and unchecked) or three (checked, unchecked and indeterminate) states. Multiple CheckEdit controls can be combined into a logical radio-group.

Namespace:DevExpress.XtraEditors
Assembly:DevExpress.XtraEditors.v17.2.dll

Expanded Syntax

Expanded Remarks

A CheckEdit control displays a check box and a caption.

According to the RepositoryItemCheckEdit.AllowGrayed setting, the CheckEdit control supports two (checked and unchecked) or three (checked, unchecked and indeterminate) check states.

Multiple check box styles are available (see RepositoryItemCheckEdit.CheckStyle). Additionally, you can assign your own images to be displayed as a check box glyph using the RepositoryItemCheckEdit.PictureChecked, RepositoryItemCheckEdit.PictureUnchecked and RepositoryItemCheckEdit.PictureGrayed properties. Check box alignment within a check editor is specified by the BaseRepositoryItemCheckEdit.GlyphAlignment property.

The control's caption can be set with the BaseCheckEdit.Text or the BaseRepositoryItemCheckEdit.Caption property. To hide the caption, you can clear these properties, or set the BaseRepositoryItemCheckEdit.GlyphAlignment option to Center.

A user can toggle check states by clicking the editor with the mouse or by pressing the SPACE key. To set the state programmatically, use either the Checked or CheckState property. Checked is Boolean and can identify only checked and unchecked states. If the check editor supports three states (see RepositoryItemCheckEdit.AllowGrayed), use the CheckState property. In the indeterminate state, the check box is displayed with a dimmed appearance, based on the RepositoryItemCheckEdit.NullStyle property.

It is possible to associate any values (not only Boolean values) with the checked, unchecked and grayed states. To accomplish this, use the RepositoryItemCheckEdit.ValueChecked, RepositoryItemCheckEdit.ValueUnchecked and RepositoryItemCheckEdit.ValueGrayed properties. When an editor's state is modified (e.g., when an end-user toggles the check box), a corresponding value (ValueChecked, ValueUnchecked or ValueGrayed) is assigned to the EditValue property. Conversely, when the EditValue property is set to either ValueChecked, ValueUnchecked or ValueGrayed in code, the check box is set to the corresponding check state and the Checked and CheckState properties are set accordingly.

If the editor is bound to a data source field, ensure that the types of the ValueChecked, ValueUnchecked or ValueGrayed values match the bound field's type.

The example below shows how to set the ValueChecked, ValueUnchecked and ValueGrayed properties to Byte values:

Multiple CheckEdit controls can be combined into a logical group of mutually exclusive options (as in a radio-group). Use the RepositoryItemCheckEdit.RadioGroupIndex property to do this. Alternatively, you can use the RadioGroup control to implement a logical group of options.

When creating multiple CheckEdit controls, you can also use the CheckedListBoxControl control. This control is easier to use for creating a set of check boxes using data binding, while separate CheckEdit editors give you greater control over the layout.

Expanded Example

This example demonstrates how to programmatically create two check editors, initialize their properties and assign the same handler for their CheckedChanged events. The created check editors will be used to control the visibility and availability of a standard button control. The example implies that the button is already placed onto a form.

Changing the check state of the first check editor affects both the button's visibility and the second check editor's availability. The second check editor specifies the availability of the button for end-users.

The image below displays the example application.

Expanded Inheritance Hierarchy

System.Object
    System.MarshalByRefObject
       System.ComponentModel.Component
          System.Windows.Forms.Control
             ControlBase
                BaseControl
                   BaseEdit
                      BaseCheckEdit
                         CheckEdit

Expanded See Also

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