| /******************************************************************************* |
| * Copyright (c) 2000, 2003 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are 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 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jface.dialogs; |
| |
| import org.eclipse.jface.resource.ImageDescriptor; |
| import org.eclipse.jface.resource.JFaceResources; |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.layout.GridData; |
| import org.eclipse.swt.widgets.*; |
| |
| /** |
| * Abstract base implementation of a dialog page. |
| * All dialog pages are subclasses of this one. |
| */ |
| public abstract class DialogPage implements IDialogPage, IMessageProvider { |
| /** |
| * The control for this dialog page. |
| */ |
| private Control control; |
| /** |
| * Optional title; <code>null</code> if none. |
| * |
| * @see #setTitle |
| */ |
| private String title = null; |
| /** |
| * Optional description; <code>null</code> if none. |
| * |
| * @see #setDescription |
| */ |
| private String description = null; |
| /** |
| * Cached image; <code>null</code> if none. |
| * |
| * @see #setImageDescription |
| */ |
| private Image image = null; |
| /** |
| * Optional image; <code>null</code> if none. |
| * |
| * @see #setImageDescription |
| */ |
| private ImageDescriptor imageDescriptor = null; |
| /** |
| * The current message; <code>null</code> if none. |
| */ |
| private String message = null; |
| /** |
| * The current message type; default value <code>NONE</code>. |
| */ |
| private int messageType = NONE; |
| /** |
| * The current error message; <code>null</code> if none. |
| */ |
| private String errorMessage = null; |
| |
| /** |
| * Font metrics to use for determining pixel sizes. |
| */ |
| private FontMetrics fontMetrics; |
| |
| /** |
| * Creates a new empty dialog page. |
| */ |
| protected DialogPage() { |
| } |
| /** |
| * Creates a new dialog page with the given title. |
| * |
| * @param title the title of this dialog page, |
| * or <code>null</code> if none |
| */ |
| protected DialogPage(String title) { |
| this.title = title; |
| } |
| /** |
| * Creates a new dialog page with the given title and image. |
| * |
| * @param title the title of this dialog page, |
| * or <code>null</code> if none |
| * @param image the image for this dialog page, |
| * or <code>null</code> if none |
| */ |
| protected DialogPage(String title, ImageDescriptor image) { |
| this(title); |
| imageDescriptor = image; |
| } |
| /** |
| * Returns the number of pixels corresponding to the |
| * height of the given number of characters. |
| * <p> |
| * This method may only be called after <code>initializeDialogUnits</code> |
| * has been called. |
| * </p> |
| * <p> |
| * Clients may call this framework method, but should not override it. |
| * </p> |
| * |
| * @param chars the number of characters |
| * @return the number of pixels |
| */ |
| protected int convertHeightInCharsToPixels(int chars) { |
| // test for failure to initialize for backward compatibility |
| if (fontMetrics == null) |
| return 0; |
| return Dialog.convertHeightInCharsToPixels(fontMetrics, chars); |
| } |
| /** |
| * Returns the number of pixels corresponding to the |
| * given number of horizontal dialog units. |
| * <p> |
| * This method may only be called after <code>initializeDialogUnits</code> |
| * has been called. |
| * </p> |
| * <p> |
| * Clients may call this framework method, but should not override it. |
| * </p> |
| * |
| * @param dlus the number of horizontal dialog units |
| * @return the number of pixels |
| */ |
| protected int convertHorizontalDLUsToPixels(int dlus) { |
| // test for failure to initialize for backward compatibility |
| if (fontMetrics == null) |
| return 0; |
| return Dialog.convertHorizontalDLUsToPixels(fontMetrics, dlus); |
| } |
| /** |
| * Returns the number of pixels corresponding to the |
| * given number of vertical dialog units. |
| * <p> |
| * This method may only be called after <code>initializeDialogUnits</code> |
| * has been called. |
| * </p> |
| * <p> |
| * Clients may call this framework method, but should not override it. |
| * </p> |
| * |
| * @param dlus the number of vertical dialog units |
| * @return the number of pixels |
| */ |
| protected int convertVerticalDLUsToPixels(int dlus) { |
| // test for failure to initialize for backward compatibility |
| if (fontMetrics == null) |
| return 0; |
| return Dialog.convertVerticalDLUsToPixels(fontMetrics, dlus); |
| } |
| /** |
| * Returns the number of pixels corresponding to the |
| * width of the given number of characters. |
| * <p> |
| * This method may only be called after <code>initializeDialogUnits</code> |
| * has been called. |
| * </p> |
| * <p> |
| * Clients may call this framework method, but should not override it. |
| * </p> |
| * |
| * @param chars the number of characters |
| * @return the number of pixels |
| */ |
| protected int convertWidthInCharsToPixels(int chars) { |
| // test for failure to initialize for backward compatibility |
| if (fontMetrics == null) |
| return 0; |
| return Dialog.convertWidthInCharsToPixels(fontMetrics, chars); |
| } |
| /** |
| * The <code>DialogPage</code> implementation of an <code>IDialogPage</code> |
| * method does nothing. Subclasses may extend. |
| */ |
| public void dispose() { |
| // deallocate SWT resources |
| if (image != null) { |
| image.dispose(); |
| image = null; |
| } |
| } |
| /** |
| * Returns the top level control for this dialog page. |
| * |
| * @return the top level control |
| */ |
| public Control getControl() { |
| return control; |
| } |
| /* (non-Javadoc) |
| * Method declared on IDialogPage. |
| */ |
| public String getDescription() { |
| return description; |
| } |
| /** |
| * Returns the symbolic font name used by dialog pages. |
| * |
| * @return the symbolic font name |
| */ |
| protected String getDialogFontName() { |
| return JFaceResources.DIALOG_FONT; |
| } |
| /* (non-Javadoc) |
| * Method declared on IDialogPage. |
| */ |
| public String getErrorMessage() { |
| return errorMessage; |
| } |
| /** |
| * Returns the default font to use for this dialog page. |
| * |
| * @return the font |
| */ |
| protected Font getFont() { |
| return JFaceResources.getFontRegistry().get(getDialogFontName()); |
| } |
| /* (non-Javadoc) |
| * Method declared on IDialogPage. |
| */ |
| public Image getImage() { |
| if (image == null) { |
| if (imageDescriptor != null) { |
| image = imageDescriptor.createImage(); |
| } |
| } |
| return image; |
| } |
| /* (non-Javadoc) |
| * Method declared on IDialogPage. |
| */ |
| public String getMessage() { |
| return message; |
| } |
| /* (non-Javadoc) |
| * Method declared on IMessageProvider. |
| */ |
| public int getMessageType() { |
| return messageType; |
| } |
| /** |
| * Returns this dialog page's shell. |
| * Convenience method for <code>getControl().getShell()</code>. |
| * This method may only be called after the page's control |
| * has been created. |
| * |
| * @return the shell |
| */ |
| public Shell getShell() { |
| return getControl().getShell(); |
| } |
| /* (non-Javadoc) |
| * Method declared on IDialogPage. |
| */ |
| public String getTitle() { |
| return title; |
| } |
| /** |
| * Returns the tool tip text for the widget with the given id. |
| * <p> |
| * The default implementation of this framework method |
| * does nothing and returns <code>null</code>. |
| * Subclasses may override. |
| * </p> |
| * |
| * @param widgetID the id of the widget for which |
| * hover help is requested |
| * @return the tool tip text, or <code>null</code> if none |
| * @depecated will be removed |
| */ |
| protected final String getToolTipText(int widgetId) { |
| // return nothing by default |
| return null; |
| } |
| /** |
| * Initializes the computation of horizontal and vertical dialog units |
| * based on the size of current font. |
| * <p> |
| * This method must be called before any of the dialog unit based |
| * conversion methods are called. |
| * </p> |
| * |
| * @param control a control from which to obtain the current font |
| */ |
| protected void initializeDialogUnits(Control control) { |
| // Compute and store a font metric |
| GC gc = new GC(control); |
| gc.setFont(control.getFont()); |
| fontMetrics = gc.getFontMetrics(); |
| gc.dispose(); |
| } |
| |
| /** |
| * Sets the <code>GridData</code> on the specified button to |
| * be one that is spaced for the current dialog page units. The |
| * method <code>initializeDialogUnits</code> must be called once |
| * before calling this method for the first time. |
| * |
| * @param button the button to set the <code>GridData</code> |
| * @return the <code>GridData</code> set on the specified button |
| */ |
| protected GridData setButtonLayoutData(Button button) { |
| GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL); |
| data.heightHint = convertVerticalDLUsToPixels(IDialogConstants.BUTTON_HEIGHT); |
| int widthHint = convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH); |
| data.widthHint = Math.max(widthHint, button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x); |
| button.setLayoutData(data); |
| return data; |
| } |
| |
| /** |
| * Tests whether this page's UI content has already been created. |
| * |
| * @return <code>true</code> if the control has been created, |
| * and <code>false</code> if not |
| */ |
| protected boolean isControlCreated() { |
| return control != null; |
| } |
| /** |
| * This default implementation of an <code>IDialogPage</code> |
| * method does nothing. Subclasses should override to take some |
| * action in response to a help request. |
| */ |
| public void performHelp() { |
| } |
| /* (non-Javadoc) |
| * Set the control for this page. |
| */ |
| protected void setControl(Control newControl) { |
| control = newControl; |
| } |
| /* (non-Javadoc) |
| * Method declared on IDialogPage. |
| */ |
| public void setDescription(String description) { |
| this.description= description; |
| } |
| /** |
| * Sets or clears the error message for this page. |
| * |
| * @param newMessage the message, or <code>null</code> to clear |
| * the error message |
| */ |
| public void setErrorMessage(String newMessage) { |
| errorMessage = newMessage; |
| } |
| /* (non-Javadoc) |
| * Method declared on IDialogPage. |
| */ |
| public void setImageDescriptor(ImageDescriptor desc) { |
| imageDescriptor = desc; |
| if (image != null) { |
| image.dispose(); |
| image = null; |
| } |
| } |
| /** |
| * Sets or clears the message for this page. |
| * <p> |
| * This is a shortcut for <code>setMessage(newMesasge, NONE)</code> |
| * </p> |
| * @param newMessage the message, or <code>null</code> to clear |
| * the message |
| */ |
| public void setMessage(String newMessage) { |
| setMessage(newMessage, NONE); |
| } |
| /** |
| * Sets the message for this page with an indication of what type |
| * of message it is. |
| * <p> |
| * The valid message types are one of <code>NONE</code>, |
| * <code>INFORMATION</code>, <code>WARNING</code>, or <code>ERROR</code>. |
| * </p> |
| * <p> |
| * Note that for backward compatibility, a message of type <code>ERROR</code> |
| * is different than an error message (set using <code>setErrorMessage</code>). |
| * An error message overrides the current message until the error message is |
| * cleared. This method replaces the current message and does not affect the |
| * error message. |
| * </p> |
| * |
| * @param newMessage the message, or <code>null</code> to clear |
| * the message |
| * @param newType the message type |
| * @since 2.0 |
| */ |
| public void setMessage(String newMessage, int newType) { |
| message = newMessage; |
| messageType = newType; |
| } |
| /** |
| * The <code>DialogPage</code> implementation of this <code>IDialogPage</code> |
| * method remembers the title in an internal state variable. |
| * Subclasses may extend. |
| */ |
| public void setTitle(String title) { |
| this.title = title; |
| } |
| /** |
| * The <code>DialogPage</code> implementation of this <code>IDialogPage</code> |
| * method sets the control to the given visibility state. |
| * Subclasses may extend. |
| */ |
| public void setVisible(boolean visible) { |
| control.setVisible(visible); |
| } |
| } |