tab.java

很好的学习swt的 sample 很好的学习swt的 sample

		/* Create the group */
		sizeGroup = new Group (controlGroup, SWT.NONE);
		sizeGroup.setLayout (new GridLayout());
		sizeGroup.setLayoutData (new GridData (GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_FILL));
		sizeGroup.setText (ControlExample.getResourceString("Size"));
	
		/* Create the controls */
	
		/*
		 * The preferred size of a widget is the size returned
		 * by widget.computeSize (SWT.DEFAULT, SWT.DEFAULT).
		 * This size is defined on a widget by widget basis.
		 * Many widgets will attempt to display their contents.
		 */
		preferredButton = new Button (sizeGroup, SWT.RADIO);
		preferredButton.setText (ControlExample.getResourceString("Preferred"));
		tooSmallButton = new Button (sizeGroup, SWT.RADIO);
		tooSmallButton.setText (TOO_SMALL_SIZE + " X " + TOO_SMALL_SIZE);
		smallButton = new Button(sizeGroup, SWT.RADIO);
		smallButton.setText (SMALL_SIZE + " X " + SMALL_SIZE);
		largeButton = new Button (sizeGroup, SWT.RADIO);
		largeButton.setText (LARGE_SIZE + " X " + LARGE_SIZE);
		fillButton = new Button (sizeGroup, SWT.RADIO);
		fillButton.setText (ControlExample.getResourceString("Fill"));
	
		/* Add the listeners */
		SelectionAdapter selectionListener = new SelectionAdapter () {
			public void widgetSelected (SelectionEvent event) {
				if (!((Button) event.widget).getSelection ()) return;
				setExampleWidgetSize ();
			};
		};
		preferredButton.addSelectionListener(selectionListener);
		tooSmallButton.addSelectionListener(selectionListener);
		smallButton.addSelectionListener(selectionListener);
		largeButton.addSelectionListener(selectionListener);
		fillButton.addSelectionListener(selectionListener);
	
		/* Set the default state */
		preferredButton.setSelection (true);
	}
	
	/**
	 * Creates the "Style" group.  The "Style" group contains
	 * controls that allow the user to change the style of
	 * the example widgets.  Changing a widget "Style" causes
	 * the widget to be destroyed and recreated.
	 */
	void createStyleGroup () {
		styleGroup = new Group (controlGroup, SWT.NONE);
		styleGroup.setLayout (new GridLayout ());
		styleGroup.setLayoutData (new GridData (GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_FILL));
		styleGroup.setText (ControlExample.getResourceString("Styles"));
	}
	
	/**
	 * Creates the tab folder page.
	 *
	 * @param tabFolder org.eclipse.swt.widgets.TabFolder
	 * @return the new page for the tab folder
	 */
	Composite createTabFolderPage (TabFolder tabFolder) {
		/*
		* Create a two column page.
		*/
		tabFolderPage = new Composite (tabFolder, SWT.NULL);
		GridLayout gridLayout = new GridLayout ();
		tabFolderPage.setLayout (gridLayout);
		gridLayout.numColumns = 2;
	
		/* Create the "Example" and "Control" columns */
		createExampleGroup ();
		createControlGroup ();
	
		/* Create the widgets in the two columns */
		createExampleWidgets ();
		createControlWidgets ();
		setExampleWidgetState ();
		
		return tabFolderPage;
	}
	
	/**
	 * Disposes the "Example" widgets.
	 */
	void disposeExampleWidgets () {
		Control [] controls = getExampleWidgets ();
		for (int i=0; i<controls.length; i++) {
			controls [i].dispose ();
		}
	}
	
	void drawImage (Image image, Color color) {
		GC gc = new GC(image);
		gc.setBackground(color);
		Rectangle bounds = image.getBounds();
		gc.fillRectangle(0, 0, bounds.width, bounds.height);
		gc.drawRectangle(0, 0, bounds.width - 1, bounds.height - 1);
		gc.dispose();
	}
	
	/**
	 * Gets the "Example" widget children.
	 *
	 * @return an array of example widget children
	 */
	Control [] getExampleWidgets () {
		return new Control [0];
	}
	
	/**
	 * Gets the text for the tab folder item.
	 *
	 * @return the text for the tab item
	 */
	String getTabText () {
		return "";
	}
	
	/**
	 * Recreates the "Example" widgets.
	 */
	void recreateExampleWidgets () {
		disposeExampleWidgets ();
		createExampleWidgets ();
		setExampleWidgetState ();
	}
	
	/**
	 * Sets the background color of the "Example" widgets.
	 */
	void setExampleWidgetBackground () {
		if (backgroundButton == null) return;
		Control [] controls = getExampleWidgets ();
		Color color = backgroundColor;
		if (color == null) color = controls [0].getBackground ();
		Image image = backgroundButton.getImage ();
		drawImage (image, color);
		backgroundButton.setImage (image);
		if (backgroundColor == null) return;
		for (int i = 0; i < controls.length; i++) {
			Control control = controls[i];
			control.setBackground (backgroundColor);
		}
	}
	
	/**
	 * Sets the enabled state of the "Example" widgets.
	 */
	void setExampleWidgetEnabled () {
		Control [] controls = getExampleWidgets ();
		for (int i=0; i<controls.length; i++) {
			controls [i].setEnabled (enabledButton.getSelection ());
		}
	}
	
	/**
	 * Sets the font of the "Example" widgets.
	 */
	void setExampleWidgetFont () {
		if (font == null) return;
		Control [] controls = getExampleWidgets ();
		for (int i = 0; i < controls.length; i++) {
			Control control = controls[i];
			control.setFont(font);
		}
	}
	
	/**
	 * Sets the foreground color of the "Example" widgets.
	 */
	void setExampleWidgetForeground () {
		if (foregroundButton == null) return;
		Control [] controls = getExampleWidgets ();
		Color color = foregroundColor;
		if (color == null) color = controls [0].getForeground ();
		Image image = foregroundButton.getImage ();
		drawImage (image, color);
		foregroundButton.setImage (image);
		if (foregroundColor == null) return;
		for (int i = 0; i < controls.length; i++) {
			Control control = controls[i];
			control.setForeground (foregroundColor);
		}
	}
	
	/**
	 * Sets the size of the "Example" widgets.
	 */
	void setExampleWidgetSize () {
		int size = SWT.DEFAULT;
		if (preferredButton == null) return;
		if (preferredButton.getSelection()) size = SWT.DEFAULT;
		if (tooSmallButton.getSelection()) size = TOO_SMALL_SIZE;
		if (smallButton.getSelection()) size = SMALL_SIZE;
		if (largeButton.getSelection()) size = LARGE_SIZE;
		Control [] controls = getExampleWidgets ();
		for (int i=0; i<controls.length; i++) {
			GridData gridData; 
			if (fillButton.getSelection()) {
				gridData = new GridData (GridData.FILL_BOTH);
			} else {
				gridData = new GridData ();
				gridData.widthHint = size;
				gridData.heightHint = size;
			}
			controls [i].setLayoutData (gridData);
		}
		/*
		 * Force the entire widget tree to layout,
		 * even when the child sizes may not have
		 * changed.
		 */
		int seenCount = 0;
		Composite [] seen = new Composite [4];
		for (int i=0; i<controls.length; i++) {
			Control control = controls [i];
			while (control != exampleGroup) {
				Composite parent = control.getParent ();
				int index = 0;
				while (index < seenCount) {
					if (seen [index] == parent) break;
					index++;
				}
				if (index == seenCount) parent.layout ();
				if (seenCount == seen.length) {
					Composite [] newSeen = new Composite [seen.length + 4];
					System.arraycopy (seen, 0, newSeen, 0, seen.length);
					seen = newSeen;
				}
				seen [seenCount++] = parent;
				control = control.getParent ();
			}
		}
	}
	
	/**
	 * Sets the state of the "Example" widgets.  Subclasses
	 * reimplement this method to set "Example" widget state
	 * that is specific to the widget.
	 */
	void setExampleWidgetState () {
		setExampleWidgetEnabled ();
		setExampleWidgetVisibility ();
		setExampleWidgetBackground ();
		setExampleWidgetForeground ();
		setExampleWidgetFont ();
		setExampleWidgetSize ();
	}
	
	/**
	 * Sets the visibility of the "Example" widgets.
	 */
	void setExampleWidgetVisibility () {
		Control [] controls = getExampleWidgets ();
		for (int i=0; i<controls.length; i++) {
			controls [i].setVisible (visibleButton.getSelection ());
		}
	}
}