Re: [platform-swt-dev] Size of IFigure in LightweightSystem

[Randy Hudson <hudsonr@xxxxxxxxxx>]

When the SWT shell is open()ed, it fires
RESIZE event even though you already sized it earlier.  This trigger's
a layout, which means that your graph Canvas has it's computeBounds() queried
by GridLayout.  The default implementation of compute bounds must
be returning 64x64.  All of the numbers you printed out change after
calling shell.open().

Try using FigureCanvas (it implements
computeBounds() by asking the Figure), and try implementing getPreferredSize()
in your custom figure instead of just hard-coding a specific size.  Questions
related to GEF should be asked on the gef-dev@xxxxxxxxxxx mailing list.

Thanks,
Randy

"W. Nathaniel Mills, III" <nat@xxxxxxxxxxxxxxxx> Sent by: platform-swt-dev-admin@xxxxxxxxxxx 09/17/2003 03:39 PM Please respond to platform-swt-dev

To:        platform-swt-dev@xxxxxxxxxxx         cc:                 Subject:        [platform-swt-dev] Size of IFigure in LightweightSystem

I have a group where I've set the bounds and I've
created a Canvas in its client area. When I query the canvas, I get reasonable
sizes:

However, when the paintFigure method is called, the dimension of the client
area is only 64x64 rather than the expected 494x59.  I've tried setting
the constructor of the Figure to a Dimension of 494x59.

Here is some example code that shows the problem.  I'd expected the
blue rectangle to fill the client area of the group.

import org.eclipse.draw2d.Figure;
import org.eclipse.draw2d.Graphics;
import org.eclipse.draw2d.LightweightSystem;
import org.eclipse.draw2d.geometry.Dimension;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Shell;

public class testFigure {
static class ChartFigure extends Figure {
    public ChartFigure(Dimension dim) {
      setMinimumSize(dim);
      System.out.println("Dim:" + dim);
      setBounds(new Rectangle(0, 0, dim.width, dim.height));
    }

    protected void paintFigure(Graphics g) {
      Rectangle clientArea = getClientArea();
      Rectangle graphArea = clientArea.getCopy();
      Dimension dim = graphArea.getSize();
      System.out.println(dim);
    }
}

public static void main(String[] args) {
    final Display display = new Display();
    Color m_Red = display.getSystemColor(SWT.COLOR_RED);
    Color m_Blue = display.getSystemColor(SWT.COLOR_BLUE);
    Color m_White = display.getSystemColor(SWT.COLOR_WHITE);
    Color m_Gray = display.getSystemColor(SWT.COLOR_WIDGET_BACKGROUND);
    Color m_Green = display.getSystemColor(SWT.COLOR_GREEN);
    Color m_Black = display.getSystemColor(SWT.COLOR_BLACK);

    final Shell shell = new Shell();
    shell.setBounds(0, 0, 540, 540);
    final GridLayout gridLayout = new GridLayout();
    gridLayout.makeColumnsEqualWidth = true;
    shell.setLayout(gridLayout);
    final Group graphGroup = new Group(shell, SWT.NONE);
    graphGroup.setBounds(0, 0, 500, 75);
    graphGroup.setText("Graph:");
    graphGroup.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
    final GridLayout graphLayout = new GridLayout();
    graphLayout.numColumns = 1;
    graphLayout.makeColumnsEqualWidth = true;
    graphGroup.setLayout(graphLayout);
    org.eclipse.swt.graphics.Rectangle rect = graphGroup.getClientArea();
    System.out.println("Rect:" + rect);

    final Canvas graphCanvas = new Canvas(graphGroup, SWT.NONE);
    graphCanvas.setBounds(graphGroup.getClientArea());
    graphCanvas.setBackground(m_Blue);
    org.eclipse.swt.graphics.Point pt = graphCanvas.getSize();
    System.out.println("Client:" + pt);

    ChartFigure m_ChartFigure = new ChartFigure(new Dimension(pt));
    LightweightSystem lws = new LightweightSystem(graphCanvas);
    lws.setContents(m_ChartFigure);
    // DESIGNER: Add controls before this line.
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
}
}

Thanks in advance for your help (I can send the source if it got too mangled)...
 Nat

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