CustomAction¶

Qualified name: delphivcl.CustomAction

class CustomAction¶

Bases: ContainedAction

TCustomAction is the base class for VCL actions intended to be used with menu items and controls. TCustomAction introduces support for the properties, events, and methods of menu items and controls that are clients of action objects. Most properties and events introduced in TCustomAction are public; therefore, use TCustomAction as a base class when deriving your own actions that publish specific subset of properties of associated controls. Action objects centralize the response to user commands (actions) and represent user interface elements in applications that use actions. They provide an easy way to synchronize, for example, the enabled state and caption of a speed button and a menu item, and handle the response when users click these components. Each such component, called the client, has its properties dynamically updated by the action and forwards user actions to the action for a response. At design time, you can work in the Action List editor with actions contained in an action list or in the Action Manager editor of the action manager. The action list or action manager is a container for actions, which it organizes into categories. Component and control public properties and events that are supported in TCustomAction, either directly or through an ancestor, are:

Caption Checked Enabled HelpType HelpContext HelpKeyword Hint ImageIndex ShortCut Visible OnHint OnUpdate OnExecute Because the OnHint, OnUpdate, and OnExecute events are public, they do not appear in the Object Inspector. That is, the Object Inspector does not support generating custom event handlers for these events. TCustomAction can also act as the base class for predefined action classes. You can derive from TCustomAction if you want to retain the public scope of supported properties and events or modify the public scope to the published scope. For predefined actions that augment the behavior of TCustomAction, see the action classes in the Vcl.StdActns, Vcl.DBActns, and Vcl.ExtActns units.

Methods

`Execute`	Generates an OnExecute event.
`Update`	Provides an opportunity to execute centralized code when an application is idle.

Attributes

`ActionComponent`	Indicates the client component that caused this action to execute.
`ActionList`	Holds the action list to which the action belongs.
`AutoCheck`	Controls whether the Checked property toggles when the action executes.
`Caption`	Represents the caption of the action.
`Category`	Group or category where the action belongs.
`Checked`	Indicates whether client controls and menu items appear checked.
`ClassName`	Returns the TObject.ClassName
`ComObject`	Specifies the interface reference implemented by the component.
`ComponentCount`	Returns the owned component count
`ComponentIndex`	Indicates the position of the component in its owner's Components property array.
`ComponentState`	Describes the current state of the component, indicating when a component needs to avoid certain actions.
`ComponentStyle`	Governs the behavior of the component.
`Components`	Returns an iterator over the owned components
`DesignInfo`	Contains information used by the Form designer.
`DisableIfNoHandler`	Indicates whether the action's clients should be disabled if no OnExecute event handler is found.
`Enabled`	Specifies the enabled state for the action.
`GroupIndex`	Indicates a group of actions in one action list.
`HelpContext`	Keeps the integer context ID that identifies the Help topic for the action.
`HelpKeyword`	Contains the keyword string that identifies the Help topic for the action.
`HelpType`	Keeps whether to use the HelpContext or HelpKeyword property to identify the Help topic.
`Hint`	Stores the Help hint text.
`ImageIndex`	Stores an index in a list of images.
`ImageName`	Displays the name of linked items from the Image Collection.
`Images`	Embarcadero Technologies does not currently have any additional information.
`Index`	Specifies the index of the action in its action list.
`Name`	Specifies the name of the component as referenced in code.
`Observers`	Indicates the TObservers object added to the TComponent.
`Owner`	Returns the Component Owner
`SecondaryShortCuts`	Stores shortcuts (in addition to ShortCut) for triggering the action.
`ShortCut`	Shortcut that triggers the action.
`StatusAction`	Stores the status for an input field in an action.
`Tag`	Stores a NativeInt integral value as a part of a component.
`VCLComObject`	Represents information used internally by components that support COM.
`Visible`	Stores whether the action representation is visible.

ActionComponent¶: Indicates the client component that caused this action to execute.

ActionList¶

Holds the action list to which the action belongs. Vcl.ActnList.TCustomAction.ActionList inherits from System.Actions.TContainedAction.ActionList. All content below this line refers to System.Actions.TContainedAction.ActionList. Holds the action list to which the action belongs.

Type:: CustomActionList

Execute()¶: Generates an OnExecute event.

ImageName¶

Displays the name of linked items from the Image Collection.

Type:: str

Images¶

Embarcadero Technologies does not currently have any additional information.

Type:: CustomImageList

Update()¶: Provides an opportunity to execute centralized code when an application is idle.