How to use

equals

method

in

org.eclipse.swt.graphics.Font

void updateFont (Font oldFont, Font newFont) {
  if (getFont ().equals (oldFont)) setFont (newFont);
}

/**
 * Sets the font used by this viewer.
 * 
 * @param font
 *            the font used by this viewer
 */
public void setFont(Font font) {
  StyledText styledText = getTextWidget();
  Font oldFont = styledText.getFont();
  if (oldFont == font) {
    return;
  }
  if (font == null || !(font.equals(oldFont))) {
    styledText.setFont(font);
  }
}

/**
 * Sets the font used by this viewer.
 *
 * @param font
 *            the font used by this viewer
 */
public void setFont(Font font) {
  StyledText styledText = getTextWidget();
  Font oldFont = styledText.getFont();
  if (oldFont == font) {
    return;
  }
  if (font == null || !(font.equals(oldFont))) {
    styledText.setFont(font);
  }
}

@Override
void setFont( Font font ) {
 if( !this.font.equals( font ) ) {
  GCOperation operation = new SetProperty( cloneFontData( FontUtil.getData( font ) ) );
  addGCOperation( operation );
 }
 this.font = font;
}

/**
 * Returns a height hint for a button control.
 * @deprecated
 * @see IDialogConstants#BUTTON_HEIGHT
 */     
@Deprecated
public static int getButtonHeigthHint(Button button) {
  if (button.getFont().equals(JFaceResources.getDefaultFont()))
    button.setFont(JFaceResources.getDialogFont());
  PixelConverter converter= new PixelConverter(button);
  return converter.convertVerticalDLUsToPixels(IDialogConstants.BUTTON_HEIGHT);
}   

@Override
public void setFont(Font font) {
  checkWidget();
  if (font != null && font.equals(getFont())) return;
  super.setFont(font);
  oldFont = getFont();
  updateFolder(REDRAW);
}
@Override

/**
 * Returns a width hint for a button control.
 */
public static int getButtonWidthHint(Button button) {
  if (button.getFont().equals(JFaceResources.getDefaultFont()))
    button.setFont(JFaceResources.getDialogFont());
  PixelConverter converter = new PixelConverter(button);
  int widthHint = converter.convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH);
  return Math.max(widthHint, button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x);
}

public void setFont(Font font) {
  checkWidget();
  if (font != null && font.equals(getFont())) return;
  super.setFont(font);
  oldFont = getFont();
  updateFolder(REDRAW);
}
public void setForeground (Color color) {

@Override
public void setFont(Font font) {
  checkWidget();
  if (font != null && font.equals(getFont())) return;
  super.setFont(font);
  oldFont = getFont();
  updateFolder(REDRAW);
}
@Override

@Override
public void setFont(Font font) {
  checkWidget();
  if (font != null && font.equals(getFont())) return;
  super.setFont(font);
  oldFont = getFont();
  updateFolder(REDRAW);
}
@Override

@Override
public void setFont(Font font) {
  checkWidget();
  if (font != null && font.equals(getFont())) return;
  super.setFont(font);
  oldFont = getFont();
  updateFolder(REDRAW);
}
@Override

/**
 * Returns a width hint for a button control.
 */
public static int getButtonWidthHint(Button button) {
  if (button.getFont().equals(JFaceResources.getDefaultFont()))
    button.setFont(JFaceResources.getDialogFont());
  PixelConverter converter= new PixelConverter(button);
  int widthHint= converter.convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH);
  return Math.max(widthHint, button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x);
}

public static int getTableHeightHint(Table table, int rows) {
  if (table.getFont().equals(JFaceResources.getDefaultFont()))
    table.setFont(JFaceResources.getDialogFont());
  int result = table.getItemHeight() * rows + table.getHeaderHeight();
  if (table.getLinesVisible())
    result += table.getGridLineWidth() * (rows - 1);
  return result;
}

public static int getTableHeightHint(Table table, int rows) {
  if (table.getFont().equals(JFaceResources.getDefaultFont()))
    table.setFont(JFaceResources.getDialogFont());
  int result= table.getItemHeight() * rows + table.getHeaderHeight();
  if (table.getLinesVisible())
    result+= table.getGridLineWidth() * (rows - 1);
  return result;
}

public static int getTableHeightHint(Table table, int rows) {
  if (table.getFont().equals(JFaceResources.getDefaultFont()))
    table.setFont(JFaceResources.getDialogFont());
  int result= table.getItemHeight() * rows + table.getHeaderHeight();
  if (table.getLinesVisible())
    result+= table.getGridLineWidth() * (rows - 1);
  return result;
}

public static int getTableHeightHint(Table table, int rows) {
  if (table.getFont().equals(JFaceResources.getDefaultFont()))
    table.setFont(JFaceResources.getDialogFont());
  int result= table.getItemHeight() * rows + table.getHeaderHeight();
  if (table.getLinesVisible())
    result+= table.getGridLineWidth() * (rows - 1);
  return result;		
}

public static int getTableHeightHint(Table table, int rows) {
  if (table.getFont().equals(JFaceResources.getDefaultFont()))
    table.setFont(JFaceResources.getDialogFont());
  int result= table.getItemHeight() * rows + table.getHeaderHeight();
  if (table.getLinesVisible())
    result+= table.getGridLineWidth() * (rows - 1);
  return result;		
}

public static int getTableHeightHint(Table table, int rows) {
  if (table.getFont().equals(JFaceResources.getDefaultFont()))
    table.setFont(JFaceResources.getDialogFont());
  int result= table.getItemHeight() * rows + table.getHeaderHeight();
  if (table.getLinesVisible())
    result+= table.getGridLineWidth() * (rows - 1);
  return result;
}

public static int getTableHeightHint(Table table, int rows) {
  if (table.getFont().equals(JFaceResources.getDefaultFont()))
    table.setFont(JFaceResources.getDialogFont());
  int result= table.getItemHeight() * rows + table.getHeaderHeight();
  if (table.getLinesVisible())
    result+= table.getGridLineWidth() * (rows - 1);
  return result;      
}

public static int getTableHeightHint(Table table, int rows)
{
  if (table.getFont().equals(JFaceResources.getDefaultFont()))
  {
    table.setFont(JFaceResources.getDialogFont());
  }
  int result = table.getItemHeight() * rows + table.getHeaderHeight();
  if (table.getLinesVisible())
  {
    result += table.getGridLineWidth() * (rows - 1);
  }
  return result;
}