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/*
* (c) Copyright IBM Corp. 2000, 2001. All Rights Reserved.
*/
package org.eclipse.cdt.debug.internal.ui;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.util.Assert;
import org.eclipse.swt.SWT;
import org.eclipse.swt.dnd.DragSource;
import org.eclipse.swt.dnd.DropTarget;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Caret;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.ScrollBar;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Widget;
/**
* Utility class to simplify access to some SWT resources.
*/
public class SWTUtil {
/**
* Returns the standard display to be used. The method first checks, if the
* thread calling this method has an associated disaply. If so, this
* display is returned. Otherwise the method returns the default display.
*/
public static Display getStandardDisplay() {
Display display;
display = Display.getCurrent();
if ( display == null )
display = Display.getDefault();
return display;
}
/**
* Returns the shell for the given widget. If the widget doesn't represent
* a SWT object that manage a shell, <code>null</code> is returned.
*
* @return the shell for the given widget
*/
public static Shell getShell(Widget widget) {
if ( widget instanceof Control )
return ((Control)widget).getShell();
if ( widget instanceof Caret )
return ((Caret)widget).getParent().getShell();
if ( widget instanceof DragSource )
return ((DragSource)widget).getControl().getShell();
if ( widget instanceof DropTarget )
return ((DropTarget)widget).getControl().getShell();
if ( widget instanceof Menu )
return ((Menu)widget).getParent().getShell();
if ( widget instanceof ScrollBar )
return ((ScrollBar)widget).getParent().getShell();
return null;
}
/**
* Returns a width hint for a button control.
*/
public static int getButtonWidthHint( Button button ) {
PixelConverter converter = new PixelConverter( button );
int widthHint = converter.convertHorizontalDLUsToPixels( IDialogConstants.BUTTON_WIDTH );
return Math.max( widthHint, button.computeSize( SWT.DEFAULT, SWT.DEFAULT, true ).x );
}
/**
* Returns a height hint for a button control.
*/
public static int getButtonHeigthHint( Button button ) {
PixelConverter converter = new PixelConverter( button );
return converter.convertVerticalDLUsToPixels( IDialogConstants.BUTTON_HEIGHT );
}
/**
* Sets width and height hint for the button control. <b>Note:</b> This
* is a NOP if the button's layout data is not an instance of <code>GridData</code>.
*
* @param the button for which to set the dimension hint
*/
public static void setButtonDimensionHint( Button button ) {
Assert.isNotNull( button );
Object gd = button.getLayoutData();
if ( gd instanceof GridData ) {
((GridData)gd).heightHint = getButtonHeigthHint( button );
((GridData)gd).widthHint = getButtonWidthHint( button );
}
}
}
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