tablecombostrategy.java

利用它可以做出非常漂亮的swt界面,包含的组件有PShelf Plist

package com.swtplus.widgets.combo;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableItem;
import org.eclipse.swt.widgets.Text;

import com.swtplus.internal.Assert;
import com.swtplus.widgets.PCombo;

/**
 * TableComboStrategy creates a Table widget inside a PCombo's dropdown.
 * The value object returned to the PCombo is a TableItem.
 */
public class TableComboStrategy implements IComboStrategy {
	
	private Table table;
	private int tableStyle = SWT.NONE;
	private int visibleItemCount = 5;
	
	/**
	 * Creates a TableComboStrategy with the given strategy style and the
	 * given SWT Table style.
	 * 
	 * @param style style bits for this strategy (currently none available)
	 * @param tableStyle SWT style bits to be given to Table constructor
	 */
	public TableComboStrategy(int style,int tableStyle) {
		this.tableStyle = tableStyle;
	}

	/* (non-Javadoc)
	 * @see com.swtplus.widgets.combo.IComboStrategy#getSize(int)
	 */
	public Point getSize(int comboWidth) {
		int x = Math.max(comboWidth,table.computeSize(SWT.DEFAULT,SWT.DEFAULT).x);
		int y = table.getHeaderHeight() + (visibleItemCount * table.getItemHeight());
		return new Point(x,y);
	}

	/* (non-Javadoc)
	 * @see com.swtplus.widgets.combo.IComboStrategy#createContents(org.eclipse.swt.widgets.Composite, com.swtplus.widgets.combo.IComboUpdater)
	 */
	public Control createContents(Composite parent, final IComboUpdater updater) {
		table = new Table(parent,tableStyle);
		
		table.addSelectionListener(new SelectionListener(){
			public void widgetSelected(SelectionEvent e) {
				TableItem[] items = table.getSelection();
				if (items.length < 1)
					return;
					
				updater.update(items[0],true);
			}
			public void widgetDefaultSelected(SelectionEvent e) {
			}}
		);
		
		return table;		
	}

	/* (non-Javadoc)
	 * @see com.swtplus.widgets.combo.IComboStrategy#keyUp(com.swtplus.widgets.combo.IComboUpdater)
	 */
	public void keyUp(IComboUpdater updater) {
		int sel = table.getSelectionIndex();
		if (sel < 1)
			return;
		table.setSelection(sel -1);
		table.showSelection();
		TableItem[] items = table.getSelection();
		if (items.length < 1)
			return;
			
		updater.update(items[0],false);		
	}

	/* (non-Javadoc)
	 * @see com.swtplus.widgets.combo.IComboStrategy#keyDown(com.swtplus.widgets.combo.IComboUpdater)
	 */
	public void keyDown(IComboUpdater updater) {
		if (table.getItemCount() == 0)
			return;
		int sel = table.getSelectionIndex();
		if (sel == -1){
			table.setSelection(0);
		} else if (sel != table.getItemCount() -1){
			table.setSelection(sel +1);
		}
		table.showSelection();
		
		TableItem[] items = table.getSelection();
		if (items.length < 1)
			return;
			
		updater.update(items[0],false);	
	}

	/* (non-Javadoc)
	 * @see com.swtplus.widgets.combo.IComboStrategy#selectValue(java.lang.Object)
	 */
	public void selectValue(Object newValue) {
		TableItem[] items = table.getItems();
		TableItem selectThis = null;
		for (int i = 0; i < items.length; i++) {
			TableItem item = items[i];
			
			if (item.getText().equals(newValue)){
				selectThis = item;
				break;
			}			
		}
		
		if (selectThis != null){
			table.setSelection(new TableItem[]{selectThis});
		}		
	}

	/* (non-Javadoc)
	 * @see com.swtplus.widgets.combo.IComboStrategy#canReturnFocusOnMouseDown()
	 */
	public boolean canReturnFocusOnMouseDown() {
		return false;
	}

	/**
	 * Returns the number of items that will be visible in the
	 * popup.
	 * 
	 * @return Items to be visible
	 */
	public int getVisibleItemCount() {
		return visibleItemCount;
	}

	/**
	 * Sets how many items will be visible in the popup.
	 * @param visibleItemCount Items to be visible
	 * 
	 */
	public void setVisibleItemCount(int visibleItemCount) {
		this.visibleItemCount = visibleItemCount;
	}

	/**
	 * Returns the Table widget created on the popup.
	 * 
	 * @return the underlying Table widget	 * 
	 */
	public Table getTable() {
		return table;
	}

	/* (non-Javadoc)
	 * @see com.swtplus.widgets.combo.IComboStrategy#mouseWheel(int)
	 */
	public void mouseWheel(int linesToScroll) {
		linesToScroll = -linesToScroll;
		if (table.getItemCount() == 0)
			return;
		
		int current = table.getTopIndex();
		current += linesToScroll;
		if (current < 0){
			current = 0;
		} else if (current > table.getItemCount() -1){
			current = table.getItemCount() -1;
		}
		table.setTopIndex(current);}

	/* (non-Javadoc)
	 * @see com.swtplus.widgets.combo.IComboStrategy#dispose()
	 */
	public void dispose() {
	}
	
	/* (non-Javadoc)
	 * @see com.swtplus.widgets.combo.IComboStrategy#createLabelProvider()
	 */
	public IComboLabelProvider createLabelProvider(){
		IComboLabelProvider labelProvider = new IComboLabelProvider(){
			public String getText(Object element) {
				if (element == null)
					return "";
				if (element instanceof String)
					return (String) element;
				TableItem item = (TableItem) element;
				return item.getText();
			}
			public Image getImage(Object element) {
				if (element == null)
					return null;
				if (element instanceof String)
					return null;
				TableItem item = (TableItem) element;
				return item.getImage();
			}
			public String getToolTip(Object element) {
				if (element == null)
					return "";
				if (element instanceof String)
					return (String) element;
				TableItem item = (TableItem) element;
				return item.getText();
			}
			public void dispose() {
			}
		};
		return labelProvider;
	}

	/* (non-Javadoc)
	 * @see com.swtplus.widgets.combo.IComboStrategy#jumpTo(java.lang.String)
	 */
	public void jumpTo(String beginning) {
		TableItem[] items = table.getItems();
		for (int i = 0; i < items.length; i++) {
			TableItem item = items[i];
			if (item.getText().toLowerCase().startsWith(beginning.toLowerCase())){
				table.setTopIndex(i);
				return;
			}
		}
		
	}

	/* (non-Javadoc)
	 * @see com.swtplus.widgets.combo.IComboStrategy#initializeEditor(org.eclipse.swt.widgets.Text)
	 */
	public void initializeEditor(Text editor) {
	}

	/* (non-Javadoc)
	 * @see com.swtplus.widgets.combo.IComboStrategy#initialize(com.swtplus.widgets.combo.PCombo)
	 */
	public void initialize(PCombo pCombo) {
	}

	public void checkValue(Object newValue) {
		Assert.isTrue(newValue instanceof String || newValue instanceof TableItem,"Value must be instance of String or TableItem");
	}

	/* (non-Javadoc)
	 * @see com.swtplus.widgets.combo.IComboStrategy#isLazyCreation()
	 */
	public boolean isLazyCreation() {
		return false;
	}


}