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| Re: How to determine size of parent figure based on a child label??? [message #217200 is a reply to message #216735] |
Thu, 01 June 2006 16:11  |
 Mark Robinson
Messages: 37
Registered: July 2009 |
Member |
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Steven Shaw wrote:
> This is a common use-case in GEF which is what the validation phase for
> figures is for. This phase will invoke the layout managers on Figure
> containers to determine the preferred size and location of the children
> based on assigned constraints.
> You would need to override the getPreferredSize or calculatePreferredSize of
> the layout manager you install on the container to union the preferred sizes
> of the children to get it's size. ToolbarLayout does something similar to
> this in it's calculatePreferredSize method. Also, XYLayout will assume
> auto-size behavior if the hints passed to calculatePreferredSize are -1, -1.
> -Steve
> "Mark Robinson" <mr@prismtech.com> wrote in message
> news:51592213bf4511a2e88ed1bdbbdc15a9$1@www.eclipse.org...
>> I'm new to draw2d and struggling ...
>>
>> I'm trying to create a figure that will contain 2 children - a
>> parallelogram in the background, plus a label that will be centered inside
>> the parallelogram.
>>
>> The size of the parallelogram is determined by the size of the label,
>> hence you need to know the bounds of the label before you can draw the
>> parallelogram.
>>
>> I'm having a lot of difficulty figuring out how to do this as the bounds
>> of the label are not known until the figure is painted. I came up with a
>> solution that involved putting each figure (label, parallelogram) onto a
>> seperate layer, and revalidating the label to get its bounds. I'm pretty
>> sure there must be an easier way of doing this as this seems too
>> complicated?
>>
>> It maybe I need to use a different layout (I'm using XYLayout at the
>> moment), such as delegating or stacklayout - I cannot find any useful
>> information on how these layouts work or how to use them.
>>
>> Can somebody enlighten me please?
>>
>>
Thanks for the info Stephen.
I actually used a different method. I don't know if this is correct but it
seems to work okay:
public class DCPS_imageFigure extends Figure
{
Label m_label;
Image m_img;
ImageFigure m_imgFig;
public DCPS_imageFigure (Image img, Label label)
{
super();
m_img = img;
m_imgFig = new ImageFigure (m_img);
m_label = label;
setLayoutManager (new XYLayout ());
org.eclipse.draw2d.geometry.Rectangle constraint = new
org.eclipse.draw2d.geometry.Rectangle (100,100,-1,-1);
add (m_imgFig, constraint);
add (m_label, constraint);
}
public void paintFigure(Graphics g)
{
//***************************************************
// Center the image around the label ...
//***************************************************
List children = getChildren();
Figure label = (Figure) children.get(1); // The label
Dimension size = label.getSize(); // Size of label
Point centerPt = label.getBounds().getCenter(); // Center point of
label
int scale = size.width + 40;
Image image = new Image (null, m_img.getImageData ().scaledTo
(scale, scale));
org.eclipse.swt.graphics.Rectangle bounds = image.getBounds();
int x, y;
x = centerPt.x - (bounds.width / 2);
y = centerPt.y - (bounds.height / 2);
m_imgFig.setLocation(new Point (x, y));
m_imgFig.setImage(image);
m_imgFig.setSize(bounds.width, bounds.height);
}
}
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