CustomControl¶

Qualified name: delphivcl.CustomControl

class CustomControl¶

Bases: WinControl

Base class for controls that wrap Windows screen objects but perform their own rendering. In most descendants of TWinControl, the job of drawing the control’s surface belongs to the underlying Windows screen object. If a control has visible features that cannot be rendered by a Windows screen object, it requires access to a canvas object so it can do its own drawing. TCustomControl is one of two base classes for controls that draw their own surfaces. Because TCustomControl is descended from TWinControl, instances of its descendants can receive focus and serve as containers. Classes of controls that perform their own screen rendering and do not need the features of TWinControl should be descendants of TGraphicControl instead of TCustomControl. TGraphicControl objects can render themselves with less overhead, because they do not have underlying Windows screen objects. TCustomControl objects have a Paint method, which is called whenever the control needs to render its image. Custom controls paint themselves using the Canvas property.

Methods

`BringToFront`	Puts the control in front of all other controls in its parent control.
`ClientToScreen`	Translates a given point from client area coordinates to global screen coordinates.
`Hide`	Hides the wrapped Control
`Invalidate`	Completely repaint control.
`Repaint`	Forces the control to repaint its image on the screen.
`ScreenToClient`	Converts the screen coordinates of a specified point on the screen to client coordinates.
`SendToBack`	Puts a windowed control behind all other windowed controls, or puts a non-windowed control behind all other non-windowed controls.
`SetBounds`	Sets the Left, Top, Width, and Height properties all at once.
`Show`	Shows the wrapped Control
`Update`	Processes any pending paint messages immediately.

Attributes

`Action`	Specifies the action associated with the control.
`Align`	Determines how the control aligns within its container (parent control).
`AlignDisabled`	Indicates child control realignment disabled.
`AlignWithMargins`	Specifies whether a control should be constrained by margins.
`Anchors`	Specifies how the control is anchored to its parent.
`BiDiMode`	Specifies the bidirectional mode for the control.
`BoundsRect`	Specifies the bounding rectangle of the control, expressed in the coordinate system of the parent control.
`Brush`	Determines the color and pattern used for painting the background of the control.
`ClassName`	Returns the TObject.ClassName
`ClientHeight`	Specifies the height of the control's client area in pixels.
`ClientOrigin`	Specifies the screen coordinates (in pixels) of the upper-left corner of a control's client area.
`ClientRect`	Specifies the size of a control's client area in pixels.
`ClientWidth`	Specifies the horizontal size of the control's client area in pixels.
`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
`Constraints`	Specifies the size constraints for the control.
`ControlCount`	Returns the count of contained controls
`ControlState`	Specifies the current state of a control at run time.
`ControlStyle`	Determines style characteristics of the control.
`Controls`	Returns an iterator over contained controls
`CurrentPPI`	Embarcadero Technologies does not currently have any additional information.
`Cursor`	Specifies the image used to represent the mouse pointer when it passes into the region covered by the control.
`CustomHint`	CustomHint is a custom hint for the control.
`DesignInfo`	Contains information used by the Form designer.
`DockClientCount`	Specifies the number of controls that are docked on the windowed control.
`DockClients`	Control:
`DockManager`	Specifies the control's docking manager interface.
`DockOrientation`	DockOrientation specifies how the control is docked relative to other controls docked in the same parent.
`DockSite`	Specifies whether the control can be the target of drag-and-dock operations.
`DoubleBuffered`	Determines whether the control's image is rendered directly to the window or painted to an in-memory bitmap first.
`DoubleBufferedMode`	DoubleBufferedMode:
`Enabled`	Controls whether the control responds to mouse, keyboard, and timer events.
`ExplicitHeight`	Specifies the explicit vertical size of the control in pixels.
`ExplicitLeft`	Specifies the explicit horizontal pixel coordinate of the left edge of a component relative to its parent.
`ExplicitTop`	Specifies the explicit vertical pixel coordinate of the top edge of a component relative to its parent.
`ExplicitWidth`	Specifies the explicit horizontal size of the control in pixels.
`Floating`	Specifies whether the control is floating.
`FloatingDockSiteClass`	Specifies the class of the temporary control that hosts the control when it is floating.
`Focused`	Determines whether the control has input focus.
`Handle`	Provides access to the underlying Windows screen object for the control.
`HandleAllocated`	Reports whether a screen object handle exists for the control.
`Height`	Specifies the vertical size of the control in pixels.
`HelpContext`	The HelpContext property contains the numeric context ID that identifies the Help topic for the control.
`HelpKeyword`	The HelpKeyword property contains the keyword string that identifies the Help topic for the control.
`HelpType`	Specifies whether the control's context-sensitive Help topic is identified by a context ID or by keyword.
`Hint`	Hint contains the text string that appears when the user moves the mouse over the control.
`HostDockSite`	Specifies the control in which the control is docked.
`IsDrawingLocked`	IsDrawingLocked property returns True when redrawing for this control is locked.
`LRDockWidth`	Specifies the width of the control when it is docked horizontally.
`Left`	Specifies the horizontal coordinate of the left edge of a component relative to its parent.
`Margins`	Specifies the margins of the control.
`MouseInClient`	Indicates whether the mouse pointer is currently in the client area of the control.
`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
`Padding`	Specifies the padding of a control.
`Parent`	Returns/Sets the Control Parent
`ParentCustomHint`	Specifies where a control looks for its custom hint.
`ParentDoubleBuffered`	ParentDoubleBuffered defers the DoubleBuffered property of this component to the value of the parent's DoubleBuffered property.
`ParentWindow`	Reference to parent's underlying control.
`PixelsPerInch`	Embarcadero Technologies does not currently have any additional information.
`RedrawDisabled`	RedrawDisabled property returns True when redrawing for this control is locked.
`ScaleFactor`	Embarcadero Technologies does not currently have any additional information.
`ShowHint`	ShowHint specifies whether to show the Help Hint when the mouse pointer moves over the control.
`Showing`	Indicates whether the control is showing on the screen.
`StyleElements`	Specifies the style elements that are used by the control.
`StyleName`	Embarcadero Technologies does not currently have any additional information.
`TBDockHeight`	Specifies the height of the control when it is docked vertically.
`TabOrder`	Indicates the position of the control in its parent's tab order.
`TabStop`	Determines whether the user can tab to a control.
`Tag`	Stores a NativeInt integral value as a part of a component.
`Top`	Specifies the Y coordinate of the upper-left corner of a control, relative to its parent or containing control in pixels.
`Touch`	Specifies the touch manager component associated with the control.
`UndockHeight`	Specifies the height of the control when it is floating.
`UndockWidth`	Specifies the width of the control when it is floating.
`UseDockManager`	Specifies whether the docking manager is used in drag-and-dock operations.
`VCLComObject`	Represents information used internally by components that support COM.
`Visible`	Specifies whether the component appears onscreen.
`VisibleDockClientCount`	Specifies the number of visible controls that are docked on the windowed control.
`Width`	Specifies the horizontal size of the control or form in pixels.

BringToFront()¶: Puts the control in front of all other controls in its parent control.

ClientToScreen()¶: Translates a given point from client area coordinates to global screen coordinates.

Hide()¶: Hides the wrapped Control

Invalidate()¶: Completely repaint control.

Parent¶: Returns/Sets the Control Parent

Repaint()¶: Forces the control to repaint its image on the screen.

ScreenToClient()¶: Converts the screen coordinates of a specified point on the screen to client coordinates.

SendToBack()¶: Puts a windowed control behind all other windowed controls, or puts a non-windowed control behind all other non-windowed controls.

SetBounds(Left, Top, Width, Height)¶: Sets the Left, Top, Width, and Height properties all at once.

Show()¶: Shows the wrapped Control

Update()¶: Processes any pending paint messages immediately.