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Base class which provides a canvas property used in graphic controls.
Source position: controls.pp line 364
type TControlCanvas = class(TCanvas) |
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protected |
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procedure CreateHandle; override; |
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Ensures that a handle exists for the class instance. |
function GetDefaultColor(); override; |
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Gets the color value used for clDefault. |
public |
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constructor Create; |
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Constructor for the class instance. |
destructor Destroy; override; |
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Destructor for the class instance. |
procedure FreeHandle; override; |
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Frees the Handle for the control canvas, and its device context when assigned. |
function ControlIsPainting; |
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Indicates if the Control has called but not completed its Paint method. |
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The Control object for which the Canvas is used. |
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end; |
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Base class which provides a canvas property used in graphic controls. |
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Implements a drawing surface for a visual control or bitmap image. |
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TFPCustomCanvas |
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TObject |
TControlCanvas is a TCanvas descendant that implements the base class which provides a canvas used in graphic controls. TControlCanvas extends the ancestor class by including a property representing the TControl associated with the canvas, a window handle for the associated control, and the device context for the handle.
TControlCanvas is used in the implementation of classes like TGraphicControl and TCustomControl, and other visual controls.
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Implements a drawing surface for a visual control or bitmap image. |
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TGraphicControl is the base class for all lightweight controls. |
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The base class for windowed controls which paint themselves. |
| Version 3.2 | Generated 2024-02-25 | Home |