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Layout problem when resizing shell [message #721320]

Thu, 01 September 2011 13:12

christian.packenius

Messages: 2
Registered: September 2011

Junior Member

Hello,

I have a very complex GUI in a program but there's a bug in it. I broke it done to a little snippet to show you (hoping, you can help me).

In this snippet I have a multi line text widget at the bottom and anything (here: a button) above. You can see my problem when you (a) write some more text lines in the text widget and (b) change the width of the shell: The text widget will become higher to show all the text.

What I need is a layout, that grabs minimal space for a complex composite (with multi line text widgets in it) but does not change it's hight after resizing the shell.

Can anybody help me?

Greetings,
Christian.

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import de.chris_soft.fyllgen.Consts;

public class GuiExample {
public static void main(String[] args) {
Display display = Consts.display;
Shell shell = new Shell(display);
shell.setLayout(new FormLayout());

Text text = new Text(shell, SWT.BORDER | SWT.MULTI | SWT.WRAP | SWT.V_SCROLL);
text.setText("Small text");
FormData fd = new FormData();
fd.bottom = new FormAttachment(100, 0);
fd.left = new FormAttachment(0, 0);
fd.right = new FormAttachment(100, 0);
text.setLayoutData(fd);

Button button = new Button(shell, 0);
button.setText("Just a button");
fd = new FormData();
fd.top = new FormAttachment(0, 0);
fd.bottom = new FormAttachment(text, -5, SWT.TOP);
fd.left = new FormAttachment(0, 0);
fd.right = new FormAttachment(100, 0);
button.setLayoutData(fd);

shell.open();

// Warten bis TopLevel-Shell geschlossen wird
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}

display.dispose();
}
}

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Re: Layout problem when resizing shell [message #721544 is a reply to message #721320]

Fri, 02 September 2011 05:13

Vijay Raj

Messages: 608
Registered: July 2009

Senior Member

Why to use a FormLayout for such a simple configuration..
why not use GridLayout(in my opinion the universal layout as in universal gates)

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class GuiExample {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout());

Button button = new Button(shell, 0);
button.setText("Just a button");

button.setLayoutData(new GridData(GridData.FILL_BOTH));

Text text = new Text(shell, SWT.BORDER | SWT.MULTI | SWT.WRAP | SWT.V_SCROLL);
text.setText("Small text");

GridData layoutData = new GridData(GridData.FILL_HORIZONTAL);
layoutData.heightHint=20;
text.setLayoutData(layoutData);



shell.open();

// Warten bis TopLevel-Shell geschlossen wird
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}

display.dispose();
}
}

or if you prefer FormLayout then

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class GuiExample {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FormLayout());

Text text = new Text(shell, SWT.BORDER | SWT.MULTI | SWT.WRAP | SWT.V_SCROLL);
text.setText("Small text");
FormData fd = new FormData();
fd.bottom = new FormAttachment(100, 0);
fd.left = new FormAttachment(0, 0);
fd.right = new FormAttachment(100, 0);
//[b]the prefered height[/b]
fd.height=20;
text.setLayoutData(fd);

Button button = new Button(shell, 0);
button.setText("Just a button");
//[b]Always create new if your layour data changes[/b]
FormData fd1 = new FormData();
fd1.top = new FormAttachment(0, 0);
fd1.bottom = new FormAttachment(text, -5, SWT.TOP);
fd1.left = new FormAttachment(0, 0);
fd1.right = new FormAttachment(100, 0);

button.setLayoutData(fd1);

shell.open();

// Warten bis TopLevel-Shell geschlossen wird
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}

display.dispose();
}
};

---------------------
why, mr. Anderson, why, why do you persist?
Because I Choose To.
Regards,
Vijay

[Updated on: Fri, 02 September 2011 05:20]

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