Improved completion processor

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

diff --git a/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/util/SWTUtil.java b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/util/SWTUtil.java
new file mode 100644 (file)
index 0000000..a5dc609
--- /dev/null
+++ b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/util/SWTUtil.java
@@ -0,0 +1,101 @@
+/*
+ * (c) Copyright IBM Corp. 2000, 2001.
+ * All Rights Reserved.
+ */
+package net.sourceforge.phpdt.internal.ui.util;
+
+
+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;
+
+import org.eclipse.jface.dialogs.IDialogConstants;
+import org.eclipse.jface.util.Assert;
+
+/**
+ * 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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