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TCanvasRecall.md

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TCanvasRecall = class(TObject)

This class holds a reference to a Canvas object and saves its current state. Later, the saved state of the Canvas object can be retrieved by calling the Retrieve method or automatically when the TCanvasRecall instance is destroyed.

Properties

In addition to the properties of the TObject class, the TCanvasRecall class has the following property:

  • public Reference: TCanvas
    The reference to a Canvas object that is managed by this instance. This property can be nil.

    By changing this property, the TCanvasRecall instance restores the state of the previous Canvas object and saves the state of the new one.

Methods

In addition to the methods of the TObject class, the TCanvasRecall class defines or overrides the following public methods:

  • constructor Create(AReference: TCanvas);
    Creates an instance of the class and saves the state of the Canvas object specified by the parameter.

    Parameter Description
    AReference The Canvas object that should be managed by this instance (can be nil)

  • destructor Destroy; override;
    Restores the saved state of the Canvas object and destroys the instance.

  • procedure Store;
    Saves the current state of the Canvas object.

  • procedure Retrieve;
    Restores the saved state of the Canvas object.