casa::PlotDrawWatcher Class Reference

Abstract parent for any class that wants to be notified when the canvas is about to start drawing. More...

#include <PlotCanvas.h>

Inheritance diagram for casa::PlotDrawWatcher:

List of all members.

Public Member Functions
	PlotDrawWatcher ()
	Constructor.
virtual	~PlotDrawWatcher ()
	Destructor.
virtual bool	canvasDrawBeginning (PlotOperationPtr drawOperation, bool drawingIsThreaded, int drawnLayersFlag)=0
	This method should be called by the canvas whenever drawing is about to begin.

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Detailed Description

Abstract parent for any class that wants to be notified when the canvas is about to start drawing.

This class is needed because a canvas could start redrawing for a number of reasons (user-requested, items changing the scale, resizing, ...) and instead of forcing applications to catch all cases this class can be used to notify when a drawing has begun for any reason.

Definition at line 55 of file PlotCanvas.h.

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Constructor & Destructor Documentation

casa::PlotDrawWatcher::PlotDrawWatcher

(

)

[inline]

Constructor.

Definition at line 58 of file PlotCanvas.h.

virtual casa::PlotDrawWatcher::~PlotDrawWatcher

(

)

[inline, virtual]

Destructor.

Definition at line 61 of file PlotCanvas.h.

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Member Function Documentation

virtual bool casa::PlotDrawWatcher::canvasDrawBeginning	(	PlotOperationPtr	drawOperation,
		bool	drawingIsThreaded,
		int	drawnLayersFlag
	)		[pure virtual]

This method should be called by the canvas whenever drawing is about to begin.

The watcher is given: A pointer to the PlotOperation object which is updated with progress information, A flag indicating whether the drawing will happen in its own thread or not, A flag indicating which layers are going to be drawn (bitwise-or of PlotCanvasLayer values). The method should return true UNLESS the watcher wants to stop the canvas from drawing. For example, if a canvas does not have threaded drawing, the watcher may want to stop drawing initially in order to spawn a new thread and then redraw.

Implemented in casa::PlotMSPlotter.

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The documentation for this class was generated from the following file:

• code/graphics/GenericPlotter/PlotCanvas.h