net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/util/SWTUtil.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2004 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpdt.internal.ui.util;
  12
  13
  14 import org.eclipse.jface.dialogs.IDialogConstants;
  15 import org.eclipse.jface.resource.JFaceResources;
  16 import org.eclipse.jface.util.Assert;
  17 import org.eclipse.swt.SWT;
  18 import org.eclipse.swt.dnd.DragSource;
  19 import org.eclipse.swt.dnd.DropTarget;
  20 import org.eclipse.swt.layout.GridData;
  21 import org.eclipse.swt.widgets.Button;
  22 import org.eclipse.swt.widgets.Caret;
  23 import org.eclipse.swt.widgets.Control;
  24 import org.eclipse.swt.widgets.Display;
  25 import org.eclipse.swt.widgets.Menu;
  26 import org.eclipse.swt.widgets.ScrollBar;
  27 import org.eclipse.swt.widgets.Shell;
  28 import org.eclipse.swt.widgets.Table;
  29 import org.eclipse.swt.widgets.Widget;
  30
  31 /**
  32  * Utility class to simplify access to some SWT resources.
  33  */
  34 public class SWTUtil {
  35
  36         /**
  37          * Returns the standard display to be used. The method first checks, if
  38          * the thread calling this method has an associated disaply. If so, this
  39          * display is returned. Otherwise the method returns the default display.
  40          */
  41         public static Display getStandardDisplay() {
  42                 Display display;
  43                 display= Display.getCurrent();
  44                 if (display == null)
  45                         display= Display.getDefault();
  46                 return display;
  47         }
  48
  49         /**
  50          * Returns the shell for the given widget. If the widget doesn't represent
  51          * a SWT object that manage a shell, <code>null</code> is returned.
  52          *
  53          * @return the shell for the given widget
  54          */
  55         public static Shell getShell(Widget widget) {
  56                 if (widget instanceof Control)
  57                         return ((Control)widget).getShell();
  58                 if (widget instanceof Caret)
  59                         return ((Caret)widget).getParent().getShell();
  60                 if (widget instanceof DragSource)
  61                         return ((DragSource)widget).getControl().getShell();
  62                 if (widget instanceof DropTarget)
  63                         return ((DropTarget)widget).getControl().getShell();
  64                 if (widget instanceof Menu)
  65                         return ((Menu)widget).getParent().getShell();
  66                 if (widget instanceof ScrollBar)
  67                         return ((ScrollBar)widget).getParent().getShell();
  68
  69                 return null;
  70         }
  71
  72
  73         /**
  74          * Returns a width hint for a button control.
  75          */
  76         public static int getButtonWidthHint(Button button) {
  77                 button.setFont(JFaceResources.getDialogFont());
  78                 PixelConverter converter= new PixelConverter(button);
  79                 int widthHint= converter.convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH);
  80                 return Math.max(widthHint, button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x);
  81         }
  82
  83         /**
  84          * Returns a height hint for a button control.
  85          */
  86         public static int getButtonHeightHint(Button button) {
  87                 button.setFont(JFaceResources.getDialogFont());
  88                 PixelConverter converter= new PixelConverter(button);
  89                 return converter.convertVerticalDLUsToPixels(IDialogConstants.BUTTON_HEIGHT);
  90         }
  91
  92         /**
  93          * Sets width and height hint for the button control.
  94          * <b>Note:</b> This is a NOP if the button's layout data is not
  95          * an instance of <code>GridData</code>.
  96          *
  97          * @param button        the button for which to set the dimension hint
  98          */
  99         public static void setButtonDimensionHint(Button button) {
 100                 Assert.isNotNull(button);
 101                 Object gd= button.getLayoutData();
 102                 if (gd instanceof GridData) {
 103                         ((GridData)gd).heightHint= getButtonHeightHint(button);
 104                         ((GridData)gd).widthHint= getButtonWidthHint(button);
 105                         ((GridData)gd).horizontalAlignment = GridData.FILL;
 106                 }
 107         }
 108
 109         public static int getTableHeightHint(Table table, int rows) {
 110                 if (table.getFont().equals(JFaceResources.getDefaultFont()))
 111                         table.setFont(JFaceResources.getDialogFont());
 112                 int result= table.getItemHeight() * rows + table.getHeaderHeight();
 113                 if (table.getLinesVisible())
 114                         result+= table.getGridLineWidth() * (rows - 1);
 115                 return result;
 116         }
 117
 118
 119 }