Why do we, use pushContext() amd popContext() method in blackberry, because they cause no effect to the screen!

and why we use pushContext(), if you want just popit after someline.

public class field_extendit extends the scope
{
field_extendit (long style)
{
Super (style);
}

protected void layout (int width, int height)
{
setExtent (width, height);
}

protected void paint (Graphics graphics)
{
B_r XYPoint = new XYPoint (200, 200);
XYPoint t_l = new XYPoint (20, 20);
XYRect rect = new XYRect (b_r, t_l);

graphics.pushContext (rect, 0, 0);
graphics.fillRect (10, 10, 30, 30);
graphics.drawRect (15, 15, 30, 30);
graphics.popContext ();

graphics.drawRect (15, 15, 30, 30);

graphics.pushContext (rect, 0, 0);
graphics.fillRect (10, 10, 30, 30);
graphics.drawRect (15, 15, 30, 30);
graphics.popContext ();

graphics.drawRect (15, 15, 30, 30);
}

}

In the example you gave, there is no advantage.  It is more benefits when you place a box grahics to another method, perhaps great painting of a class method.

Tags: BlackBerry Developers

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