gridlayouttab.java

很好的学习swt的 sample 很好的学习swt的 sample

package org.eclipse.swt.examples.layoutexample;

/*
 * Copyright (c) 2000, 2002 IBM Corp.  All rights reserved.
 * This file is made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 */

import org.eclipse.swt.*;
import org.eclipse.swt.custom.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.graphics.*;

class GridLayoutTab extends Tab {
	/* Controls for setting layout parameters */
	Text numColumns;
	Button makeColumnsEqualWidth;
	Combo marginHeight, marginWidth, horizontalSpacing, verticalSpacing;
	/* The example layout instance */
	GridLayout gridLayout;
	/* TableEditors and related controls*/
	TableEditor comboEditor, widthEditor, heightEditor;
	TableEditor vAlignEditor, hAlignEditor, hIndentEditor;
	TableEditor hSpanEditor, vSpanEditor, hGrabEditor, vGrabEditor;
	CCombo combo, vAlign, hAlign, hGrab, vGrab;
	Text widthText, heightText, hIndent, hSpan, vSpan;
	
	/* Constants */
	final int COMBO_COL = 1;
	final int WIDTH_COL = 2;
	final int HEIGHT_COL = 3;
	final int HALIGN_COL = 4;
	final int VALIGN_COL = 5;
	final int HINDENT_COL = 6;
	final int HSPAN_COL = 7;
	final int VSPAN_COL = 8;
	final int HGRAB_COL = 9;
	final int VGRAB_COL = 10;
	
	final int TOTAL_COLS = 11;
		
	/**
	 * Creates the Tab within a given instance of LayoutExample.
	 */
	GridLayoutTab(LayoutExample instance) {
		super(instance);
	}
	
	/**
	 * Creates the widgets in the "child" group.
	 */
	void createChildWidgets () {
		/* Create the TraverseListener */
		final TraverseListener traverseListener = new TraverseListener () {
			public void keyTraversed (TraverseEvent e) {
				if (e.detail == SWT.TRAVERSE_RETURN || e.detail == SWT.TRAVERSE_TAB_NEXT)
					resetEditors ();
				if (e.detail == SWT.TRAVERSE_ESCAPE)
					disposeEditors ();
			};
		};
		
		/* Add common controls */
		super.createChildWidgets ();
			
		/* Add TableEditors */		
		comboEditor = new TableEditor (table);
		widthEditor = new TableEditor (table);
		heightEditor = new TableEditor (table);
		vAlignEditor = new TableEditor (table);
		hAlignEditor = new TableEditor (table);
		hIndentEditor = new TableEditor (table);
		hSpanEditor = new TableEditor (table);
		vSpanEditor = new TableEditor (table);
		hGrabEditor = new TableEditor (table);
		vGrabEditor = new TableEditor (table);
		table.addMouseListener (new MouseAdapter () {
			public void mouseDown(MouseEvent e) {
				resetEditors();
				index = table.getSelectionIndex ();
				Point pt = new Point (e.x, e.y);
                newItem = table.getItem (pt);
                if (newItem == null) return;
                TableItem oldItem = comboEditor.getItem ();
                if (newItem == oldItem || newItem != lastSelected) {
					lastSelected = newItem;
					return;
				}
				table.showSelection ();
				
				combo = new CCombo (table, SWT.READ_ONLY);
				createComboEditor (combo, comboEditor);
				
				widthText = new Text (table, SWT.SINGLE);
				widthText.setText (((String [])data.elementAt (index)) [WIDTH_COL]);
				createTextEditor (widthText, widthEditor, WIDTH_COL);
				
				heightText = new Text (table, SWT.SINGLE);
				heightText.setText (((String [])data.elementAt (index)) [HEIGHT_COL]);
				createTextEditor (heightText, heightEditor, HEIGHT_COL);
				String [] alignValues = new String [] {"BEGINNING","CENTER","END","FILL"};
				hAlign = new CCombo (table, SWT.NONE);
				hAlign.setItems (alignValues);
				hAlign.setText (newItem.getText (HALIGN_COL));
				hAlignEditor.horizontalAlignment = SWT.LEFT;
				hAlignEditor.grabHorizontal = true;
				hAlignEditor.minimumWidth = 50;
				hAlignEditor.setEditor (hAlign, newItem, HALIGN_COL);
				hAlign.addTraverseListener (traverseListener);
				
				vAlign = new CCombo (table, SWT.NONE);
				vAlign.setItems (alignValues);
				vAlign.setText (newItem.getText (VALIGN_COL));
				vAlignEditor.horizontalAlignment = SWT.LEFT;
				vAlignEditor.grabHorizontal = true;
				vAlignEditor.minimumWidth = 50;
				vAlignEditor.setEditor (vAlign, newItem, VALIGN_COL);
				vAlign.addTraverseListener (traverseListener);
				
				hIndent = new Text (table, SWT.SINGLE);
				hIndent.setText (((String [])data.elementAt (index)) [HINDENT_COL]);
				createTextEditor (hIndent, hIndentEditor, HINDENT_COL);
				
				hSpan = new Text (table, SWT.SINGLE);
				hSpan.setText (((String [])data.elementAt (index)) [HSPAN_COL]);
				createTextEditor (hSpan, hSpanEditor, HSPAN_COL);
				
				vSpan = new Text (table, SWT.SINGLE);
				vSpan.setText (((String [])data.elementAt (index)) [VSPAN_COL]);
				createTextEditor (vSpan, vSpanEditor, VSPAN_COL);
				
				String [] boolValues = new String [] {"false","true"};
				hGrab = new CCombo (table, SWT.NONE);
				hGrab.setItems (boolValues);
				hGrab.setText (newItem.getText (HGRAB_COL));
				hGrabEditor.horizontalAlignment = SWT.LEFT;
				hGrabEditor.grabHorizontal = true;
				hGrabEditor.minimumWidth = 50;
				hGrabEditor.setEditor (hGrab, newItem, HGRAB_COL);
				hGrab.addTraverseListener (traverseListener);;
				
				vGrab = new CCombo (table, SWT.NONE);
				vGrab.setItems (boolValues);
				vGrab.setText (newItem.getText (VGRAB_COL));
				vGrabEditor.horizontalAlignment = SWT.LEFT;
				vGrabEditor.grabHorizontal = true;
				vGrabEditor.minimumWidth = 50;
				vGrabEditor.setEditor (vGrab, newItem, VGRAB_COL);
				vGrab.addTraverseListener (traverseListener);
                
                for (int i=0; i<table.getColumnCount (); i++) {
                	Rectangle rect = newItem.getBounds (i);
                    if (rect.contains (pt)) {
                    	switch (i) {
							case COMBO_COL :
								combo.setFocus ();	
								break;
							case WIDTH_COL :	
								widthText.setFocus ();
								break;
							case HEIGHT_COL :
								heightText.setFocus ();
								break;
							case HALIGN_COL :
								hAlign.setFocus ();
								break;
							case VALIGN_COL :
								vAlign.setFocus ();
								break;
							case HINDENT_COL :
								hIndent.setFocus ();
								break;
							case HSPAN_COL :
								hSpan.setFocus ();
								break;
							case VSPAN_COL :
								vSpan.setFocus ();
								break;
							case HGRAB_COL :
								hGrab.setFocus ();
								break;
							case VGRAB_COL :
								vGrab.setFocus ();
								break;
							default :
								resetEditors ();
								break;
						}
                    }
                } 
			}
		});
		
		/* Add listener to add an element to the table */
		add.addSelectionListener(new SelectionAdapter () {
			public void widgetSelected(SelectionEvent e) {
				TableItem item = new TableItem (table, 0);
				String [] insert = new String [] { 
					String.valueOf (table.indexOf (item)), "Button",
					"-1","-1","BEGINNING","CENTER",
					"0","1","1","false","false"};
				item.setText (insert);
				data.addElement (insert);
				resetEditors ();
			}
		});
	}

	/**
	 * Creates the control widgets.
	 */
	void createControlWidgets () {
		/* Rearrange the layout of the control group */
		size.setLayoutData (new GridData ());
		
		/* Controls the margins and spacing of the GridLayout */
		String [] marginValues = new String [] {"0","3","5","10"};
		Group marginGroup = new Group (controlGroup, SWT.NONE);
		marginGroup.setText (LayoutExample.getResourceString ("Margins_Spacing"));
		GridData data = new GridData (GridData.FILL_HORIZONTAL);
		data.verticalSpan = 2;
		marginGroup.setLayoutData (data);
		GridLayout layout = new GridLayout ();
		layout.numColumns = 2;
		marginGroup.setLayout (layout);
		new Label (marginGroup, SWT.NONE).setText ("marginHeight");
		marginHeight = new Combo (marginGroup, SWT.NONE);
		marginHeight.setItems (marginValues);
		marginHeight.select (2);
		data = new GridData (GridData.FILL_HORIZONTAL);
		data.widthHint = 60;
		marginHeight.setLayoutData (data);
		marginHeight.addSelectionListener (selectionListener);
		marginHeight.addTraverseListener (traverseListener);
		new Label (marginGroup, SWT.NONE).setText ("marginWidth");
		marginWidth = new Combo (marginGroup, SWT.NONE);
		marginWidth.setItems (marginValues);
		marginWidth.select (2);
		data = new GridData (GridData.FILL_HORIZONTAL);
		data.widthHint = 60;
		marginWidth.setLayoutData (data);
		marginWidth.addSelectionListener (selectionListener);
		marginWidth.addTraverseListener (traverseListener);
		new Label (marginGroup, SWT.NONE).setText ("horizontalSpacing");
		horizontalSpacing = new Combo (marginGroup, SWT.NONE);
		horizontalSpacing.setItems (marginValues);
		horizontalSpacing.select (2);
		data = new GridData (GridData.FILL_HORIZONTAL);
		data.widthHint = 60;
		horizontalSpacing.setLayoutData (data);
		horizontalSpacing.addSelectionListener (selectionListener);
		horizontalSpacing.addTraverseListener (traverseListener);
		new Label (marginGroup, SWT.NONE).setText ("verticalSpacing");
		verticalSpacing = new Combo (marginGroup, SWT.NONE);
		verticalSpacing.setItems (marginValues);
		verticalSpacing.select (2);
		data = new GridData (GridData.FILL_HORIZONTAL);
		data.widthHint = 60;
		verticalSpacing.setLayoutData (data);
		verticalSpacing.addSelectionListener (selectionListener);
		verticalSpacing.addTraverseListener (traverseListener);
        
        /* Controls the columns in the GridLayout */
		Group columnGroup = new Group (controlGroup, SWT.NONE);
		columnGroup.setText (LayoutExample.getResourceString ("Columns"));
		layout = new GridLayout ();
		layout.numColumns = 2;
		columnGroup.setLayout (layout);
		data = new GridData (GridData.VERTICAL_ALIGN_FILL);
		columnGroup.setLayoutData (data);
		numColumns = new Text (columnGroup, SWT.BORDER);
		numColumns.setText ("1");
		numColumns.addSelectionListener (selectionListener);
		numColumns.addTraverseListener (traverseListener);
       	data = new GridData (GridData.FILL_HORIZONTAL);
       	data.widthHint = 15;
       	numColumns.setLayoutData (data);
       	new Label (columnGroup, SWT.NONE).setText ("numColumns");
		makeColumnsEqualWidth = new Button (columnGroup, SWT.CHECK);
		makeColumnsEqualWidth.setText ("makeColumnsEqualWidth");
		makeColumnsEqualWidth.addSelectionListener (selectionListener);
		data = new GridData (GridData.FILL_HORIZONTAL);
		data.horizontalSpan = 2;
		data.horizontalIndent = 14;
		makeColumnsEqualWidth.setLayoutData (data);

		/* Add common controls */
		super.createControlWidgets ();
		controlGroup.pack();
	}