backgrounddialog.java

具有不同语法高亮的编辑器实例

			String colorString = currentColor.toString();
			imageFileNameField.setText(colorString.substring(colorString.indexOf('[')));
			this.repaint();
		}

		else if (actionCommand.equals("PressedImageRadioButton")) {
			colorBrowseButton.setEnabled(false);
			imageBrowseButton.setEnabled(true);
			viewingColors = false;
			//imageFileNameField.setVisible(true);
			if (currentImageFileName!=null) {
				imageFileNameField.setText(currentImageFileName);
				okButton.setEnabled(true);
			}
			else {
				imageFileNameField.setText(msg.getString("NoImageLabel"));
				okButton.setEnabled(false);
			}
			this.repaint();
		}

		else if (actionCommand.equals("BrowseColors")) {
			Color tempColor = JColorChooser.showDialog(null,
							msg.getString("BGColorChooserTitle"),
							currentColor);
			if (tempColor != null) {
				currentColor = tempColor;
				String colorString = currentColor.toString();
				imageFileNameField.setText(colorString.substring(colorString.indexOf('[')));
				this.repaint();
				//currentImageFileName = null;
			}
		}

		else if (actionCommand.equals("BrowseImages")) {

			int returnVal = imageChooser.showOpenDialog(this);

			// If they selected a file and clicked "OK", open the flie!
			if (returnVal == JFileChooser.APPROVE_OPTION) {
				currentImageFileName = imageChooser.getSelectedFile().getAbsolutePath();
				previewImage = new ImageIcon(currentImageFileName).getImage();
				int length = currentImageFileName.length();
				String extension = currentImageFileName.substring(length-3,length).toUpperCase();
				if ((!extension.equals("GIF") && !extension.equals("JPG")) || previewImage==null) {
					JOptionPane.showMessageDialog(this,
							msg.getString("ImageFileError") + "\n'" +
										currentImageFileName + "'",
							msg.getString("ErrorDialogTitle"),
							JOptionPane.ERROR_MESSAGE);
					currentImageFileName = null;
					okButton.setEnabled(false);
					imageFileNameField.setText(msg.getString("NoImageLabel"));
				}
				else {
					imageFileNameField.setText(currentImageFileName);
					okButton.setEnabled(true);
					this.repaint();
				}
			}

		}

		else if (actionCommand.equals("BackgroundOK")) {
			this.setVisible(false);
		}

		else if (actionCommand.equals("BackgroundCancel")) {
			currentColor = null;
			currentImageFileName = null;
			this.setVisible(false);
		}

	}


/*****************************************************************************/


	/**
	 * Returns the background the user chose - either a
	 * <code>java.awt.Color</code> or a <code>java.awt.Image</code>,
	 * or <code>null</code> if they hit cancel.
	 *
	 * @return The background, as an <code>Object</code>.
	 */
	public Object getChosenBackground() {
		if (viewingColors)
			return currentColor;
		else if (currentImageFileName != null)
				return getImageFromFile(currentImageFileName);
		return null;
	}


/*****************************************************************************/


	/**
	 * Returns the full path to the image the user chose, or <code>null</code>
	 * if the user selected a color or hit cancel.
	 *
	 * @return The full path to the image the user chose for the background,
	 *         or <code>null</code>.
	 */
	public String getCurrentImageFileName() {
		if (viewingColors)
			return null;
		return currentImageFileName;	// Should be null if they hit cancel.
	}


/*****************************************************************************/


	/**
	 * Returns an image from a file in a safe fashion.
	 *
	 * @param fileName The file from which to get the image (must be .jpg or
	 *                 .bmp).
	 * @return The image contained in the file, or <code>null</code> if the
	 *         image file was invalid.
	 */
	private Image getImageFromFile(String fileName) {

		BufferedImage image = null;
		try {
			image = ImageIO.read(new URL("file:///" + fileName));
		} catch (Exception e) {	// IOException or MalformedURLException
			JOptionPane.showMessageDialog(this,
						msg.getString("ImageFileIOError") + "\nFile: " +
											fileName + " -\n" + e,
						msg.getString("ErrorDialogTitle"),
						JOptionPane.ERROR_MESSAGE);
		}
		return image;

	}


/*****************************************************************************/


	/**
	 * Sets the currently-selected background in this dialog.  This should be
	 * called just before calling <code>setVisible(true)</code>.
	 *
	 * @param defaultBackground Should be either a <code>java.awt.Color</code>
	 *        instance or a <code>java.awt.Image</code> instance containing an
	 *        image to use as the initial background choice.
	 * @param imageFileName Full path to the file containing
	 *        <code>defaultBackground</code>, if it is an image.  If it is a
	 *        <code>java.awt.Color</code>, this parameter should be
	 *        <code>null</code>.
	 */
	public void initializeData(Object defaultBackground, String imageFileName) {

		if (defaultBackground instanceof Color) {
			currentColor = (Color)defaultBackground;
			currentImageFileName = null;
			String colorString = currentColor.toString();
			imageFileNameField.setText(colorString.substring(colorString.indexOf('[')));
			colorButton.setSelected(true);	// In case they selected "Image", then cancelled last time.
			colorBrowseButton.setEnabled(true);
			imageBrowseButton.setEnabled(false);
			okButton.setEnabled(true); 		// In case they selected "Image", then cancelled last time.
			viewingColors = true;
		}
		else if (defaultBackground instanceof Image) {
			currentImageFileName = imageFileName;// We know that the image is currently displayed.
			previewImage = new ImageIcon(currentImageFileName).getImage();
			imageFileNameField.setText(currentImageFileName);
			currentColor = Color.WHITE;
			imageButton.setSelected(true);	// In case they selected "Color", then cancelled last time.
			colorBrowseButton.setEnabled(false);
			imageBrowseButton.setEnabled(true);
			viewingColors = false;
		}
		else {
			JOptionPane.showMessageDialog(this,
					msg.getString("BGBadObjectMessage") + "\n" + defaultBackground,
					msg.getString("ErrorDialogTitle"),
					JOptionPane.ERROR_MESSAGE);
			currentImageFileName = null;
			imageFileNameField.setText(msg.getString("NoImageLabel"));
			currentColor = Color.WHITE;
			colorBrowseButton.setEnabled(true);
			imageBrowseButton.setEnabled(false);
			viewingColors = true;
		}

	}


/*****************************************************************************/


	/**
	 * Paints the dialog.  This is overridden to properly paint the "preview"
	 * image or color.
	 *
	 * @param g The graphics context.
	 */
	public void paint(Graphics g) {

		// Paint all of the regular dialog components.
		super.paint(g);

		// If they are looking at colors, paint the current color in a block.
		if (viewingColors==true) {
			Insets insets = getInsets();
			Graphics newG = g.create();
			newG.setColor(currentColor);
			newG.fillRect(18+insets.left, 28+insets.top,
						80+insets.left, 61+insets.top);
		}

		// Otherwise, if they are looking at images, paint the current image.
		else {
			if (currentImageFileName != null) {
				Insets insets = getInsets();
				g.drawImage(previewImage, 18+insets.left,28+insets.top,
							80+insets.left,61+insets.top, null);
			}
		}

	}


/*****************************************************************************/


	/**
	 * Updates the UI used by this dialog.  This is overridden to update the
	 * file chooser for images.
	 */
	public void updateUI() {
		if (imageChooser != null)
			SwingUtilities.updateComponentTreeUI(imageChooser);
	}


/*****************************************************************************/

}