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A themeable Look and Feel for java swing
/*
* MIT License
*
* Copyright (c) 2020 Jannis Weis
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
* associated documentation files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge, publish, distribute,
* sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or
* substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
* NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
package com.github.weisj.darklaf.components;
import java.awt.*;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.*;
import com.github.weisj.darklaf.delegate.ScrollLayoutManagerDelegate;
import com.github.weisj.darklaf.ui.scrollpane.ScrollBarConstants;
import com.github.weisj.darklaf.util.PropertyKey;
/**
* Scroll pane that displays its content beneath the scrollbar.
*
* @author Jannis Weis
*/
public class OverlayScrollPane extends JLayeredPane implements PropertyChangeListener {
protected final JScrollPane scrollPane;
private final ControlPanel controlPanel;
/**
* Creates a OverlayScrollPane that displays the contents of the specified component,
* where both horizontal and vertical scrollbars appear whenever the component's contents are larger
* than the view and scrolling in underway or the mouse is over the scrollbar position. The
* scrollbars appear over the viewport.
*/
public OverlayScrollPane() {
this(null);
}
/**
* Creates a OverlayScrollPane that displays the contents of the specified component,
* where both horizontal and vertical scrollbars appear whenever the component's contents are larger
* than the view and scrolling in underway or the mouse is over the scrollbar position.
*
* @param view the component to display in the scrollable viewport
* @see JScrollPane#setViewportView
*/
public OverlayScrollPane(final JComponent view) {
this(view, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
}
/**
* Creates a OverlayScrollPane that displays the view component in a viewport whose
* view position can be controlled with a pair of scrollbars. The scrollbars appear over the
* viewport. The scrollbar policies specify when the scrollbars are displayed, For example, if
* vsbPolicy is JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED then the vertical scrollbar only appears if
* the view doesn't fit vertically. The available policy settings are listed at
* {@link JScrollPane#setVerticalScrollBarPolicy(int)} and
* {@link JScrollPane#setHorizontalScrollBarPolicy}.
*
* @param view the view of the component.
* @param vsbPolicy an integer that specifies the vertical scrollbar policy
* @param hsbPolicy an integer that specifies the horizontal scrollbar policy
*/
public OverlayScrollPane(final JComponent view, final int vsbPolicy, final int hsbPolicy) {
this.scrollPane = createScrollPane(view, vsbPolicy, hsbPolicy);
setupScrollPane(scrollPane);
setViewportView(view);
add(scrollPane, JLayeredPane.DEFAULT_LAYER);
controlPanel = new ControlPanel(scrollPane);
add(controlPanel, JLayeredPane.PALETTE_LAYER);
}
/**
* Creates a OverlayScrollPane that displays the view component in a viewport whose
* view position can be controlled with a pair of scrollbars. The scrollbars appear over the
* viewport.
*
* @param scrollPane the scroll pane to use.
*/
public OverlayScrollPane(final JScrollPane scrollPane) {
this.scrollPane = scrollPane;
setupScrollPane(scrollPane);
add(scrollPane, JLayeredPane.DEFAULT_LAYER);
controlPanel = new ControlPanel(scrollPane);
add(controlPanel, JLayeredPane.PALETTE_LAYER);
}
protected JScrollPane createScrollPane(final JComponent view, final int vsbPolicy, final int hsbPolicy) {
return new JScrollPane(view, vsbPolicy, hsbPolicy);
}
protected void setupScrollPane(final JScrollPane scrollPane) {
JScrollBar verticalScrollBar = createScrollBar(JScrollBar.VERTICAL);
verticalScrollBar.putClientProperty(ScrollBarConstants.KEY_SCROLL_PANE_PARENT, scrollPane);
JScrollBar horizontalScrollBar = createScrollBar(JScrollBar.HORIZONTAL);
horizontalScrollBar.putClientProperty(ScrollBarConstants.KEY_SCROLL_PANE_PARENT, scrollPane);
scrollPane.addPropertyChangeListener(this);
updateScrollPaneUI();
scrollPane.setVerticalScrollBar(verticalScrollBar);
scrollPane.setHorizontalScrollBar(horizontalScrollBar);
scrollPane.setColumnHeader(scrollPane.getColumnHeader());
scrollPane.setRowHeader(scrollPane.getRowHeader());
}
protected PopupScrollBar createScrollBar(final int orientation) {
return new PopupScrollBar(orientation);
}
/**
* Returns the scroll pane used by this scroll indicator. Use carefully (e.g. to set unit
* increments) because not all changes have an effect. You have to write listeners in this cases
* (e.g. for changing the scrollbar policy)
*
* @return the scrollPane
*/
public JScrollPane getScrollPane() {
return scrollPane;
}
@Override
public void doLayout() {
scrollPane.setSize(getSize());
controlPanel.setSize(getSize());
scrollPane.doLayout();
}
public void setVerticalScrollBarPolicy(final int policy) {
scrollPane.setVerticalScrollBarPolicy(policy);
controlPanel.showVerticalScrollBar(policy != JScrollPane.VERTICAL_SCROLLBAR_NEVER);
}
public void setHorizontalScrollBarPolicy(final int policy) {
scrollPane.setHorizontalScrollBarPolicy(policy);
controlPanel.showHorizontalScrollBar(policy != JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
}
public JScrollBar getVerticalScrollBar() {
return scrollPane.getVerticalScrollBar();
}
@Override
public Dimension getPreferredSize() {
return scrollPane.getPreferredSize();
}
public JScrollBar getHorizontalScrollBar() {
return scrollPane.getHorizontalScrollBar();
}
public void setViewportView(final Component c) {
scrollPane.setViewportView(c);
}
@Override
public void propertyChange(final PropertyChangeEvent evt) {
String key = evt.getPropertyName();
if (PropertyKey.UI.equals(key)) {
updateScrollPaneUI();
}
}
protected void updateScrollPaneUI() {
if (scrollPane == null) return;
scrollPane.setLayout(new ScrollLayoutManagerDelegate((ScrollPaneLayout) scrollPane.getLayout()) {
@Override
public void removeLayoutComponent(final Component comp) {
if (comp == scrollPane.getVerticalScrollBar() || comp == scrollPane.getHorizontalScrollBar()) {
return;
}
super.removeLayoutComponent(comp);
}
@Override
public void layoutContainer(final Container parent) {
super.layoutContainer(parent);
viewport = getViewport();
JScrollBar verticalScrollBar = scrollPane.getVerticalScrollBar();
JScrollBar horizontalScrollBar = scrollPane.getHorizontalScrollBar();
if (viewport != null) {
Rectangle bounds = viewport.getBounds();
Rectangle vertBounds = verticalScrollBar.getBounds();
Rectangle horBounds = horizontalScrollBar.getBounds();
JViewport columnHeader = getColumnHeader();
JViewport rowHeader = getRowHeader();
if (getComponentOrientation().isLeftToRight()) {
if (verticalScrollBar.isVisible()) {
bounds.width += vertBounds.width;
}
if (columnHeader != null && verticalScrollBar.isVisible()) {
Rectangle chb = columnHeader.getBounds();
chb.width += vertBounds.width;
columnHeader.setBounds(chb);
}
if (rowHeader != null && horizontalScrollBar.isVisible()) {
Rectangle rhb = rowHeader.getBounds();
rhb.height += horBounds.height;
rowHeader.setBounds(rhb);
}
} else {
if (verticalScrollBar.isVisible()) {
bounds.x -= vertBounds.width;
bounds.width += vertBounds.width;
}
if (columnHeader != null && verticalScrollBar.isVisible()) {
Rectangle chb = columnHeader.getBounds();
chb.x -= vertBounds.width;
chb.width += vertBounds.width;
columnHeader.setBounds(chb);
}
if (rowHeader != null && horizontalScrollBar.isVisible()) {
Rectangle rhb = rowHeader.getBounds();
rhb.height += horBounds.height;
rowHeader.setBounds(rhb);
}
}
if (horizontalScrollBar.isVisible()) {
bounds.height += horBounds.height;
}
viewport.setBounds(bounds);
}
}
});
}
protected static final class PopupScrollBar extends JScrollBar {
private PopupScrollBar(final int direction) {
super(direction);
putClientProperty(ScrollBarConstants.KEY_FAST_WHEEL_SCROLLING, true);
setOpaque(false);
}
@Override
public boolean isOpaque() {
return false;
}
}
@Override
public void setPreferredSize(final Dimension preferredSize) {
super.setPreferredSize(preferredSize);
scrollPane.setPreferredSize(preferredSize);
}
private static final class ControlPanel extends JPanel {
private boolean showVertical;
private boolean showHorizontal;
private final JScrollPane scrollPane;
private ControlPanel(final JScrollPane scrollPane) {
this.scrollPane = scrollPane;
setLayout(null);
scrollPane.setVerticalScrollBar(scrollPane.getVerticalScrollBar());
if (scrollPane.getVerticalScrollBarPolicy() != JScrollPane.VERTICAL_SCROLLBAR_NEVER) {
showVertical = true;
add(scrollPane.getVerticalScrollBar());
}
scrollPane.setHorizontalScrollBar(scrollPane.getHorizontalScrollBar());
if (scrollPane.getHorizontalScrollBarPolicy() != JScrollPane.HORIZONTAL_SCROLLBAR_NEVER) {
showHorizontal = true;
add(scrollPane.getHorizontalScrollBar());
}
}
private void showVerticalScrollBar(final boolean show) {
if (show == showVertical) {
return;
}
showVertical = show;
scrollPane.getVerticalScrollBar().setVisible(show);
}
private void showHorizontalScrollBar(final boolean show) {
if (show == showHorizontal) {
return;
}
showHorizontal = show;
scrollPane.getHorizontalScrollBar().setVisible(show);
}
@Override
public boolean contains(final int x, final int y) {
if (scrollPane.getHorizontalScrollBar().isVisible()
&& scrollPane.getHorizontalScrollBar().getBounds().contains(x, y)) {
return true;
}
return scrollPane.getVerticalScrollBar().isVisible()
&& scrollPane.getVerticalScrollBar().getBounds().contains(x, y);
}
@Override
public boolean isOpaque() {
return false;
}
}
}
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