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/*
* 11/14/2003
*
* RScrollPane.java - An extension of JScrollPane that adds right-click popup
* menus on the scrollbars for scrolling.
* Copyright (C) 2003 Robert Futrell
* http://fifesoft.com/rtext
* Licensed under a modified BSD license.
* See the included license file for details.
*/
package org.fife.ui;
import java.awt.*;
import java.awt.event.*;
import java.io.Serializable;
import java.util.ResourceBundle;
import javax.swing.*;
/**
* An extension of JScrollPane that adds popup menus on its
* scrollbars, allowing the user to scroll, page over, etc.
*
* @author Robert Futrell
* @version 1.0
*/
public class RScrollPane extends JScrollPane implements ActionListener,
Serializable {
private static final long serialVersionUID = 1L;
private JPopupMenu vertSBMenu;
private JPopupMenu horizSBMenu;
// Mouse position RELATIVE TO THE SCROLLBAR when the user opens a
// scrollbar's popup menu.
private int mouseX, mouseY;
/**
* Creates an RScrollPane with no view. Note that if you use
* this constructor, you should then call setViewportView.
*/
public RScrollPane() {
initialize();
}
/**
* Creates an RScrollPane with the specified view.
*
* @param view The component this scrollpane contains.
*/
public RScrollPane(Component view) {
super(view);
initialize();
}
/**
* Creates an RScrollPane with the specified size and
* specified view.
*
* @param width The preferred width of the scrollpane.
* @param height The preferred height of the scrollpane.
* @param view The component this scrollpane contains.
*/
public RScrollPane(int width, int height, Component view) {
super(view);
setPreferredSize(new Dimension(width, height));
initialize();
}
/**
* Listens for scrollbars' popup menus' actions.
*
* @param e The action event.
*/
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
// Scroll to the position the mouse points to horizontally.
if ("ScrollHereHorizontal".equals(command)) {
int width = getHorizontalScrollBar().getWidth();
float howFarIn = ((float)mouseX) / ((float)width);
BoundedRangeModel brm = getHorizontalScrollBar().getModel();
int newPosition = java.lang.Math.round(howFarIn *
(brm.getMaximum() - brm.getMinimum())) - brm.getExtent()/2;
brm.setValue(newPosition);
}
// Scroll to the position the mouse points to vertically.
else if ("ScrollHereVertical".equals(command)) {
int height = getVerticalScrollBar().getHeight();
float howFarIn = ((float)mouseY) / ((float)height);
BoundedRangeModel brm = getVerticalScrollBar().getModel();
int newPosition = java.lang.Math.round(howFarIn *
(brm.getMaximum() - brm.getMinimum())) - brm.getExtent()/2;
brm.setValue(newPosition);
}
// Scroll to the top.
else if ("Top".equals(command)) {
BoundedRangeModel brm = getVerticalScrollBar().getModel();
brm.setValue(0);
}
// Scroll to the bottom.
else if ("Bottom".equals(command)) {
BoundedRangeModel brm = getVerticalScrollBar().getModel();
brm.setValue(brm.getMaximum());
}
// Scroll one page up in the document.
else if ("PageUp".equals(command)) {
JViewport viewport = getViewport();
Point p = viewport.getViewPosition();
int viewportHeight = viewport.getExtentSize().height;
p.translate(0, -viewportHeight);
if (p.getY()<0)
p.setLocation(p.getX(), 0);
viewport.setViewPosition(p);
}
// Scroll one page down in the document.
else if ("PageDown".equals(command)) {
JViewport viewport = getViewport();
Point p = viewport.getViewPosition();
int viewportHeight = viewport.getExtentSize().height;
Component view = viewport.getView();
double tempY = p.getY() + viewportHeight;
if (view.getHeight() >= tempY + viewportHeight)
p.setLocation(p.getX(), tempY);
else
p.setLocation(p.getX(), view.getHeight() - viewportHeight);
viewport.setViewPosition(p);
}
// Scroll one unit up in the document.
else if ("ScrollUp".equals(command)) {
JViewport viewport = getViewport();
Point p = viewport.getViewPosition();
int unitIncrement = getVerticalScrollBar().getUnitIncrement(-1);
if (p.getY() > unitIncrement) {
p.translate(0, -unitIncrement);
viewport.setViewPosition(p);
}
else {
p.setLocation(p.getX(), 0);
viewport.setViewPosition(p);
}
}
// Scroll one unit down in the document.
else if ("ScrollDown".equals(command)) {
JViewport viewport = getViewport();
Point p = viewport.getViewPosition();
int unitIncrement = getVerticalScrollBar().getUnitIncrement(1);
Component view = viewport.getView();
if (p.getY() < view.getHeight() - viewport.getHeight() - unitIncrement) {
p.translate(0, unitIncrement);
viewport.setViewPosition(p);
}
else {
p.setLocation(p.getX(), view.getHeight() - viewport.getHeight());
viewport.setViewPosition(p);
}
}
// Scroll all the way to the left.
else if ("LeftEdge".equals(command)) {
BoundedRangeModel brm = getHorizontalScrollBar().getModel();
brm.setValue(0);
}
// Scroll all the way to the right.
else if ("RightEdge".equals(command)) {
BoundedRangeModel brm = getHorizontalScrollBar().getModel();
brm.setValue(brm.getMaximum());
}
// Scroll one page to the left.
else if ("PageLeft".equals(command)) {
JViewport viewport = getViewport();
Point p = viewport.getViewPosition();
int viewportWidth = viewport.getExtentSize().width;
p.translate(-viewportWidth, 0);
if (p.getX()<0)
p.setLocation(0, p.getY());
viewport.setViewPosition(p);
}
// Scroll one page to the right.
else if ("PageRight".equals(command)) {
JViewport viewport = getViewport();
Point p = viewport.getViewPosition();
Component view = viewport.getView();
int viewportWidth = viewport.getExtentSize().width;
p.translate(viewportWidth, 0);
if (p.getX() > view.getWidth()-viewportWidth)
p.setLocation(view.getWidth()-viewportWidth, p.getY());
viewport.setViewPosition(p);
}
// Scroll one element (pixel) to the left.
else if ("ScrollLeft".equals(command)) {
JViewport viewport = getViewport();
Point p = viewport.getViewPosition();
int unitIncrement = getHorizontalScrollBar().getUnitIncrement(-1);
if (p.getX() > unitIncrement) {
p.translate(-unitIncrement, 0);
viewport.setViewPosition(p);
}
else {
p.setLocation(0, p.getY());
viewport.setViewPosition(p);
}
}
// Scroll one element (pixel) to the right.
else if ("ScrollRight".equals(command)) {
JViewport viewport = getViewport();
Point p = viewport.getViewPosition();
int unitIncrement = getHorizontalScrollBar().getUnitIncrement(1);
Component view = viewport.getView();
if (p.getX() < view.getWidth() - viewport.getWidth() - unitIncrement) {
p.translate(unitIncrement, 0);
viewport.setViewPosition(p);
}
else {
p.setLocation(view.getWidth() - viewport.getWidth(), p.getY());
viewport.setViewPosition(p);
}
}
}
/**
* Adds a menu item to a menu.
*
* @param key A key into this scroll pane's resource bundle for the menu
* item's value.
* @param actionCommand The command sent to the listener (the scroll pane).
* @param menu The popup menu to which to add the item.
* @param msg The resource bundle containing text, etc.
*/
private final void addMenuItem(String key, String actionCommand,
JPopupMenu menu, ResourceBundle msg) {
JMenuItem item = new JMenuItem(msg.getString(key));
item.setActionCommand(actionCommand);
item.addActionListener(this);
menu.add(item);
}
/**
* Sets up horizontal scrollbar's popup menu.
*/
private void createHorizontalScrollBarMenu() {
horizSBMenu = new JPopupMenu();
ResourceBundle msg = ResourceBundle.getBundle(RScrollPane.class.getName());
addMenuItem("ScrollHere", "ScrollHereHorizontal", horizSBMenu, msg);
horizSBMenu.addSeparator();
addMenuItem("LeftEdge", "LeftEdge", horizSBMenu, msg);
addMenuItem("RightEdge", "RightEdge", horizSBMenu, msg);
horizSBMenu.addSeparator();
addMenuItem("PageLeft", "PageLeft", horizSBMenu, msg);
addMenuItem("PageRight", "PageRight", horizSBMenu, msg);
horizSBMenu.addSeparator();
addMenuItem("ScrollLeft","ScrollLeft",horizSBMenu, msg);
addMenuItem("ScrollRight", "ScrollRight", horizSBMenu, msg);
horizSBMenu.applyComponentOrientation(getComponentOrientation());
}
/**
* Sets up vertical scrollbar's popup menu.
*/
private void createVerticalScrollBarMenu() {
vertSBMenu = new JPopupMenu();
ResourceBundle msg = ResourceBundle.getBundle(RScrollPane.class.getName());
addMenuItem("ScrollHere","ScrollHereVertical", vertSBMenu, msg);
vertSBMenu.addSeparator();
addMenuItem("Top", "Top", vertSBMenu, msg);
addMenuItem("Bottom", "Bottom", vertSBMenu, msg);
vertSBMenu.addSeparator();
addMenuItem("PageUp", "PageUp", vertSBMenu, msg);
addMenuItem("PageDown", "PageDown", vertSBMenu, msg);
vertSBMenu.addSeparator();
addMenuItem("ScrollUp", "ScrollUp", vertSBMenu, msg);
addMenuItem("ScrollDown", "ScrollDown", vertSBMenu, msg);
vertSBMenu.applyComponentOrientation(getComponentOrientation());
}
private void initialize() {
// Create scrollbars' popup menus.
MouseListener popupListener = new PopupListener();
getVerticalScrollBar().addMouseListener(popupListener);
getHorizontalScrollBar().addMouseListener(popupListener);
}
/**
* Resets the UI property with a value from the current look and feel.
* This overrides JComponent's updateUI method,
* so that the popup menus are updated as well.
*/
public void updateUI() {
super.updateUI();
if (vertSBMenu!=null)
SwingUtilities.updateComponentTreeUI(vertSBMenu);
if (horizSBMenu!=null)
SwingUtilities.updateComponentTreeUI(horizSBMenu);
}
/**
* Class to listen for, and respond do, popup menu requests.
*/
class PopupListener extends MouseAdapter {
public void mousePressed(MouseEvent e) {
maybeShowPopup(e);
}
public void mouseReleased(MouseEvent e) {
maybeShowPopup(e);
}
private void maybeShowPopup(MouseEvent e) {
if (e.isPopupTrigger()) {
mouseX = e.getX();
mouseY = e.getY();
if (e.getComponent().equals(getVerticalScrollBar())) {
if (vertSBMenu==null)
createVerticalScrollBarMenu();
vertSBMenu.show(getVerticalScrollBar(),
mouseX,mouseY);
}
else {
if (horizSBMenu==null)
createHorizontalScrollBarMenu();
horizSBMenu.show(getHorizontalScrollBar(),
mouseX,mouseY);
}
}
}
}
}
