package com.onpositive.mapper.newwizard;
import org.eclipse.swt.SWT;
import org.eclipse.swt.accessibility.AccessibleAdapter;
import org.eclipse.swt.accessibility.AccessibleEvent;
import org.eclipse.swt.dnd.DragSource;
import org.eclipse.swt.dnd.DropTarget;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Caret;
import org.eclipse.swt.widgets.Combo;
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.Table;
import org.eclipse.swt.widgets.Widget;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.layout.PixelConverter;
import org.eclipse.jface.resource.JFaceResources;
/**
* Utility class to simplify access to some SWT resources.
*/
public class SWTUtil {
/**
* The default visible item count for {@link Combo}s.
* Workaround for https://bugs.eclipse.org/bugs/show_bug.cgi?id=245569 .
*
* @see Combo#setVisibleItemCount(int)
*
* @since 3.5
*/
public static final int COMBO_VISIBLE_ITEM_COUNT = 30;
/**
* Returns the standard display to be used. The method first checks, if
* the thread calling this method has an associated display. If so, this
* display is returned. Otherwise the method returns the default display.
* @return returns the standard display to be used
*/
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.
* @param widget the widget
*
* @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.
* @param button the button
* @return the width hint
*/
public static int getButtonWidthHint(Button button) {
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);
}
/**
* 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 button 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).widthHint = getButtonWidthHint(button);
((GridData) gd).horizontalAlignment = GridData.FILL;
}
}
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;
}
/**
* Adds an accessibility listener returning the given fixed name.
*
* @param control the control to add the accessibility support to
* @param text the name
*/
public static void setAccessibilityText(Control control,
final String text) {
control.getAccessible().addAccessibleListener(
new AccessibleAdapter() {
public void getName(AccessibleEvent e) {
e.result = text;
}
});
}
/**
* Sets the default visible item count for {@link Combo}s.
* Workaround for https://bugs.eclipse.org/bugs/show_bug.cgi?id=7845 .
*
* @param combo the combo
*
* @see Combo#setVisibleItemCount(int)
* @see #COMBO_VISIBLE_ITEM_COUNT
*
* @since 3.5
*/
public static void setDefaultVisibleItemCount(Combo combo) {
combo.setVisibleItemCount(COMBO_VISIBLE_ITEM_COUNT);
}
public static GridLayout newLayoutNoMargins(int columns) {
GridLayout layout = new GridLayout(columns, false);
layout.marginWidth = 0;
layout.marginHeight = 0;
return layout;
}
}