/*
* @(#)${NAME}.java
*
* Copyright 2002 - 2005 JIDE Software Inc. All rights reserved.
*/
package com.jidesoft.swing;
import javax.swing.*;
import javax.swing.border.Border;
import java.awt.*;
/**
* The layout manager used by <code>JideScrollPane</code>. <code>JideScrollPaneLayout</code> is responsible for eleven
* components: a viewport, two scrollbars, a row header, a column header, a row footer, a column footer, and four
* "corner" components.
*/
public class JideScrollPaneLayout extends ScrollPaneLayout implements JideScrollPaneConstants {
/**
* The row footer child. Default is <code>null</code>.
*
* @see JideScrollPane#setRowFooter
*/
protected JViewport _rowFoot;
/**
* The row sub column header componeng. Default is <code>null</code>.
*
* @see JideScrollPane#setSubColumnHeader
*/
protected JViewport _subColHead;
/**
* The column footer child. Default is <code>null</code>.
*
* @see JideScrollPane#setColumnFooter
*/
protected JViewport _colFoot;
/**
* The component to the left of horizontal scroll bar.
*/
protected Component _hLeft;
/**
* The component to the right of horizontal scroll bar.
*/
protected Component _hRight;
/**
* The component to the top of vertical scroll bar.
*/
protected Component _vTop;
/**
* The component to the bottom of vertical scroll bar.
*/
protected Component _vBottom;
/**
* The component under upper left corner. Default is <code>null</code>.
*/
protected Component _subUpperLeft;
/**
* The component under upper right corner. Default is <code>null</code>.
*/
protected Component _subUpperRight;
private static final long serialVersionUID = 7897026041296359186L;
@Override
public void syncWithScrollPane(JScrollPane sp) {
super.syncWithScrollPane(sp);
if (sp instanceof JideScrollPane) {
_rowFoot = ((JideScrollPane) sp).getRowFooter();
_colFoot = ((JideScrollPane) sp).getColumnFooter();
_subColHead = ((JideScrollPane) sp).getSubColumnHeader();
_hLeft = ((JideScrollPane) sp).getScrollBarCorner(HORIZONTAL_LEFT);
_hRight = ((JideScrollPane) sp).getScrollBarCorner(HORIZONTAL_RIGHT);
_vTop = ((JideScrollPane) sp).getScrollBarCorner(VERTICAL_TOP);
_vBottom = ((JideScrollPane) sp).getScrollBarCorner(VERTICAL_BOTTOM);
_subUpperLeft = sp.getCorner(SUB_UPPER_LEFT);
_subUpperRight = sp.getCorner(SUB_UPPER_RIGHT);
}
}
protected boolean isHsbCoversWholeWidth(JScrollPane sp) {
return sp instanceof JideScrollPane && ((JideScrollPane) sp).isHorizontalScrollBarCoversWholeWidth();
}
protected boolean isVsbCoversWholeHeight(JScrollPane sp) {
return sp instanceof JideScrollPane && ((JideScrollPane) sp).isVerticalScrollBarCoversWholeHeight();
}
protected boolean isColumnHeadersHeightUnified(JScrollPane sp) {
return sp instanceof JideScrollPane && ((JideScrollPane) sp).isColumnHeadersHeightUnified();
}
protected boolean isColumnFootersHeightUnified(JScrollPane sp) {
return sp instanceof JideScrollPane && ((JideScrollPane) sp).isColumnFootersHeightUnified();
}
@Override
public void addLayoutComponent(String s, Component c) {
if (s.equals(ROW_FOOTER)) {
_rowFoot = (JViewport) addSingletonComponent(_rowFoot, c);
}
else if (s.equals(SUB_COLUMN_HEADER)) {
_subColHead = (JViewport) addSingletonComponent(_subColHead, c);
}
else if (s.equals(COLUMN_FOOTER)) {
_colFoot = (JViewport) addSingletonComponent(_colFoot, c);
}
else if (s.equals(HORIZONTAL_LEFT)) {
_hLeft = addSingletonComponent(_hLeft, c);
}
else if (s.equals(HORIZONTAL_RIGHT)) {
_hRight = addSingletonComponent(_hRight, c);
}
else if (s.equals(VERTICAL_TOP)) {
_vTop = addSingletonComponent(_vTop, c);
}
else if (s.equals(VERTICAL_BOTTOM)) {
_vBottom = addSingletonComponent(_vBottom, c);
}
else if (s.equals(SUB_UPPER_LEFT)) {
_subUpperLeft = addSingletonComponent(_subUpperLeft, c);
}
else if (s.equals(SUB_UPPER_RIGHT)) {
_subUpperRight = addSingletonComponent(_subUpperRight, c);
}
else {
super.addLayoutComponent(s, c);
}
}
@Override
public void removeLayoutComponent(Component c) {
if (c == _rowFoot) {
_rowFoot = null;
}
else if (c == _subColHead) {
_subColHead = null;
}
else if (c == _colFoot) {
_colFoot = null;
}
else if (c == _hLeft) {
_hLeft = null;
}
else if (c == _hRight) {
_hRight = null;
}
else if (c == _vTop) {
_vTop = null;
}
else if (c == _vBottom) {
_vBottom = null;
}
else if (c == _subUpperLeft) {
_subUpperLeft = null;
}
else if (c == _subUpperRight) {
_subUpperRight = null;
}
else {
super.removeLayoutComponent(c);
}
}
/**
* Returns the <code>JViewport</code> object that is the row footer.
*
* @return the <code>JViewport</code> object that is the row footer
*
* @see JideScrollPane#getRowFooter
*/
public JViewport getRowFooter() {
return _rowFoot;
}
/**
* Returns the <code>JViewport</code> object that is the row sub column header.
*
* @return the <code>JViewport</code> object that is the row sub column header.
*
* @see com.jidesoft.swing.JideScrollPane#getSubColumnHeader()
*/
public JViewport getRowSubColumnHeader() {
return _subColHead;
}
/**
* Returns the <code>JViewport</code> object that is the column footer.
*
* @return the <code>JViewport</code> object that is the column footer
*
* @see JideScrollPane#getColumnFooter
*/
public JViewport getColumnFooter() {
return _colFoot;
}
/**
* Returns the <code>Component</code> at the specified corner.
*
* @param key the <code>String</code> specifying the corner
* @return the <code>Component</code> at the specified corner, as defined in {@link ScrollPaneConstants}; if
* <code>key</code> is not one of the four corners, <code>null</code> is returned
*
* @see JScrollPane#getCorner
*/
public Component getScrollBarCorner(String key) {
if (key.equals(HORIZONTAL_LEFT)) {
return _hLeft;
}
else if (key.equals(HORIZONTAL_RIGHT)) {
return _hRight;
}
else if (key.equals(VERTICAL_BOTTOM)) {
return _vBottom;
}
else if (key.equals(VERTICAL_TOP)) {
return _vTop;
}
else if (key.equals(SUB_UPPER_LEFT)) {
return _subUpperLeft;
}
else if (key.equals(SUB_UPPER_RIGHT)) {
return _subUpperRight;
}
else {
return super.getCorner(key);
}
}
/**
* The preferred size of a <code>ScrollPane</code> is the size of the insets, plus the preferred size of the
* viewport, plus the preferred size of the visible headers, plus the preferred size of the scrollbars that will
* appear given the current view and the current scrollbar displayPolicies. <p>Note that the rowHeader is calculated
* as part of the preferred width and the colHeader is calculated as part of the preferred size.
*
* @param parent the <code>Container</code> that will be laid out
* @return a <code>Dimension</code> object specifying the preferred size of the viewport and any scrollbars
*
* @see ViewportLayout
* @see LayoutManager
*/
@Override
public Dimension preferredLayoutSize(Container parent) {
/* Sync the (now obsolete) policy fields with the
* JScrollPane.
*/
JScrollPane scrollPane = (JScrollPane) parent;
vsbPolicy = scrollPane.getVerticalScrollBarPolicy();
hsbPolicy = scrollPane.getHorizontalScrollBarPolicy();
boolean flatLayout = scrollPane instanceof JideScrollPane && ((JideScrollPane) scrollPane).isFlatLayout();
Insets insets = parent.getInsets();
int prefWidth = insets.left + insets.right;
int prefHeight = insets.top + insets.bottom;
/* Note that viewport.getViewSize() is equivalent to
* viewport.getView().getPreferredSize() modulo a null
* view or a view whose size was explicitly set.
*/
Dimension extentSize = null;
Dimension viewSize = null;
Component view = null;
if (viewport != null) {
extentSize = viewport.getPreferredSize();
viewSize = viewport.getViewSize();
view = viewport.getView();
if (flatLayout && viewport.getView() != null) {
extentSize = viewport.getView().getPreferredSize();
}
}
/* If there's a viewport add its preferredSize.
*/
if (extentSize != null) {
prefWidth += extentSize.width;
prefHeight += extentSize.height;
}
/* If there's a JScrollPane.viewportBorder, add its insets.
*/
Border viewportBorder = scrollPane.getViewportBorder();
if (viewportBorder != null) {
Insets vpbInsets = viewportBorder.getBorderInsets(parent);
prefWidth += vpbInsets.left + vpbInsets.right;
prefHeight += vpbInsets.top + vpbInsets.bottom;
}
/* If a header exists and it's visible, factor its
* preferred size in.
*/
int rowHeaderWidth = 0;
if (rowHead != null && rowHead.isVisible()) {
rowHeaderWidth = rowHead.getPreferredSize().width;
}
if (upperLeft != null && upperLeft.isVisible()) {
rowHeaderWidth = Math.max(rowHeaderWidth, upperLeft.getPreferredSize().width);
}
if (lowerLeft != null && lowerLeft.isVisible()) {
rowHeaderWidth = Math.max(rowHeaderWidth, lowerLeft.getPreferredSize().width);
}
if (_subUpperLeft != null && _subUpperLeft.isVisible()) {
rowHeaderWidth = Math.max(rowHeaderWidth, _subUpperLeft.getPreferredSize().width);
}
prefWidth += rowHeaderWidth;
int upperHeight = getUpperHeight();
prefHeight += upperHeight + getSubUpperHeight();
if ((_rowFoot != null) && _rowFoot.isVisible()) {
prefWidth += _rowFoot.getPreferredSize().width;
}
int lowerHeight = getLowerHeight();
prefHeight += lowerHeight;
/* If a scrollbar is going to appear, factor its preferred size in.
* If the scrollbars policy is AS_NEEDED, this can be a little
* tricky:
*
* - If the view is a Scrollable then scrollableTracksViewportWidth
* and scrollableTracksViewportHeight can be used to effectively
* disable scrolling (if they're true) in their respective dimensions.
*
* - Assuming that a scrollbar hasn't been disabled by the
* previous constraint, we need to decide if the scrollbar is going
* to appear to correctly compute the JScrollPanes preferred size.
* To do this we compare the preferredSize of the viewport (the
* extentSize) to the preferredSize of the view. Although we're
* not responsible for laying out the view we'll assume that the
* JViewport will always give it its preferredSize.
*/
if ((vsb != null) && (vsbPolicy != VERTICAL_SCROLLBAR_NEVER) && !flatLayout) {
if (vsbPolicy == VERTICAL_SCROLLBAR_ALWAYS) {
prefWidth += vsb.getPreferredSize().width;
}
else if ((viewSize != null) && (extentSize != null)) {
boolean canScroll = true;
if (view instanceof Scrollable) {
canScroll = !((Scrollable) view).getScrollableTracksViewportHeight();
}
if (canScroll && (viewSize.height > extentSize.height)) {
prefWidth += vsb.getPreferredSize().width;
}
}
}
if ((hsb != null) && (hsbPolicy != HORIZONTAL_SCROLLBAR_NEVER) && !flatLayout) {
if (hsbPolicy == HORIZONTAL_SCROLLBAR_ALWAYS) {
prefHeight += hsb.getPreferredSize().height;
}
else if ((viewSize != null) && (extentSize != null)) {
boolean canScroll = true;
if (view instanceof Scrollable) {
canScroll = !((Scrollable) view).getScrollableTracksViewportWidth();
}
if (canScroll && (viewSize.width > extentSize.width)) {
prefHeight += hsb.getPreferredSize().height;
}
}
}
return new Dimension(prefWidth, prefHeight);
}
private int getSubUpperHeight() {
int subUpperHeight = 0;
if ((_subUpperLeft != null) && _subUpperLeft.isVisible()) {
subUpperHeight = _subUpperLeft.getPreferredSize().height;
}
if ((_subUpperRight != null) && _subUpperRight.isVisible()) {
subUpperHeight = Math.max(_subUpperRight.getPreferredSize().height, subUpperHeight);
}
if ((_subColHead != null) && _subColHead.isVisible()) {
subUpperHeight = Math.max(_subColHead.getPreferredSize().height, subUpperHeight);
}
return subUpperHeight;
}
private int getUpperHeight() {
int upperHeight = 0;
if ((upperLeft != null) && upperLeft.isVisible()) {
upperHeight = upperLeft.getPreferredSize().height;
}
if ((upperRight != null) && upperRight.isVisible()) {
upperHeight = Math.max(upperRight.getPreferredSize().height, upperHeight);
}
if ((colHead != null) && colHead.isVisible()) {
upperHeight = Math.max(colHead.getPreferredSize().height, upperHeight);
}
return upperHeight;
}
private int getLowerHeight() {
int lowerHeight = 0;
if ((lowerLeft != null) && lowerLeft.isVisible()) {
lowerHeight = lowerLeft.getPreferredSize().height;
}
if ((lowerRight != null) && lowerRight.isVisible()) {
lowerHeight = Math.max(lowerRight.getPreferredSize().height, lowerHeight);
}
if ((_colFoot != null) && _colFoot.isVisible()) {
lowerHeight = Math.max(_colFoot.getPreferredSize().height, lowerHeight);
}
return lowerHeight;
}
/**
* The minimum size of a <code>ScrollPane</code> is the size of the insets plus minimum size of the viewport, plus
* the scrollpane's viewportBorder insets, plus the minimum size of the visible headers, plus the minimum size of
* the scrollbars whose displayPolicy isn't NEVER.
*
* @param parent the <code>Container</code> that will be laid out
* @return a <code>Dimension</code> object specifying the minimum size
*/
@Override
public Dimension minimumLayoutSize(Container parent) {
/* Sync the (now obsolete) policy fields with the
* JScrollPane.
*/
JScrollPane scrollPane = (JScrollPane) parent;
boolean flatLayout = scrollPane instanceof JideScrollPane && ((JideScrollPane) scrollPane).isFlatLayout();
if (flatLayout) {
return preferredLayoutSize(parent);
}
vsbPolicy = scrollPane.getVerticalScrollBarPolicy();
hsbPolicy = scrollPane.getHorizontalScrollBarPolicy();
Insets insets = parent.getInsets();
int minWidth = insets.left + insets.right;
int minHeight = insets.top + insets.bottom;
/* If there's a viewport add its minimumSize.
*/
if (viewport != null) {
Dimension size = viewport.getMinimumSize();
if (flatLayout && viewport.getView() != null) {
size = viewport.getView().getMinimumSize();
}
minWidth += size.width;
minHeight += size.height;
}
/* If there's a JScrollPane.viewportBorder, add its insets.
*/
Border viewportBorder = scrollPane.getViewportBorder();
if (viewportBorder != null) {
Insets vpbInsets = viewportBorder.getBorderInsets(parent);
minWidth += vpbInsets.left + vpbInsets.right;
minHeight += vpbInsets.top + vpbInsets.bottom;
}
/* If a header exists and it's visible, factor its
* minimum size in.
*/
int rowHeaderWidth = 0;
if (rowHead != null && rowHead.isVisible()) {
Dimension size = rowHead.getMinimumSize();
rowHeaderWidth = size.width;
minHeight = Math.max(minHeight, size.height);
}
if (upperLeft != null && upperLeft.isVisible()) {
rowHeaderWidth = Math.max(rowHeaderWidth, upperLeft.getMinimumSize().width);
}
if (lowerLeft != null && lowerLeft.isVisible()) {
rowHeaderWidth = Math.max(rowHeaderWidth, lowerLeft.getMinimumSize().width);
}
if (_subUpperLeft != null && _subUpperLeft.isVisible()) {
rowHeaderWidth = Math.max(rowHeaderWidth, _subUpperLeft.getMinimumSize().width);
}
minWidth += rowHeaderWidth;
int upperHeight = 0;
if ((upperLeft != null) && upperLeft.isVisible()) {
upperHeight = upperLeft.getMinimumSize().height;
}
if ((upperRight != null) && upperRight.isVisible()) {
upperHeight = Math.max(upperRight.getMinimumSize().height, upperHeight);
}
if ((colHead != null) && colHead.isVisible()) {
Dimension size = colHead.getMinimumSize();
minWidth = Math.max(minWidth, size.width);
upperHeight = Math.max(size.height, upperHeight);
}
minHeight += upperHeight;
int subUpperHeight = 0;
if ((_subUpperLeft != null) && _subUpperLeft.isVisible()) {
subUpperHeight = _subUpperLeft.getMinimumSize().height;
}
if ((_subUpperRight != null) && _subUpperRight.isVisible()) {
subUpperHeight = Math.max(_subUpperRight.getMinimumSize().height, subUpperHeight);
}
if ((_subColHead != null) && _subColHead.isVisible()) {
Dimension size = _subColHead.getMinimumSize();
minWidth = Math.max(minWidth, size.width);
subUpperHeight = Math.max(size.height, subUpperHeight);
}
minHeight += subUpperHeight;
// JIDE: added for JideScrollPaneLayout
int lowerHeight = 0;
if ((lowerLeft != null) && lowerLeft.isVisible()) {
lowerHeight = lowerLeft.getMinimumSize().height;
}
if ((lowerRight != null) && lowerRight.isVisible()) {
lowerHeight = Math.max(lowerRight.getMinimumSize().height, lowerHeight);
}
if ((_colFoot != null) && _colFoot.isVisible()) {
Dimension size = _colFoot.getMinimumSize();
minWidth = Math.max(minWidth, size.width);
lowerHeight = Math.max(size.height, lowerHeight);
}
minHeight += lowerHeight;
if ((_rowFoot != null) && _rowFoot.isVisible()) {
Dimension size = _rowFoot.getMinimumSize();
minWidth = Math.max(minWidth, size.width);
minHeight += size.height;
}
// JIDE: End of added for JideScrollPaneLayout
/* If a scrollbar might appear, factor its minimum
* size in.
*/
if ((vsb != null) && (vsbPolicy != VERTICAL_SCROLLBAR_NEVER) && !flatLayout) {
Dimension size = vsb.getMinimumSize();
minWidth += size.width;
minHeight = Math.max(minHeight, size.height);
}
if ((hsb != null) && (hsbPolicy != HORIZONTAL_SCROLLBAR_NEVER && !flatLayout)) {
Dimension size = hsb.getMinimumSize();
minWidth = Math.max(minWidth, size.width);
minHeight += size.height;
}
return new Dimension(minWidth, minHeight);
}
/**
* Lays out the scrollpane. The positioning of components depends on the following constraints: <ul> <li> The row
* header, if present and visible, gets its preferred width and the viewport's height.
* <p/>
* <li> The column header, if present and visible, gets its preferred height and the viewport's width.
* <p/>
* <li> If a vertical scrollbar is needed, i.e. if the viewport's extent height is smaller than its view height or
* if the <code>displayPolicy</code> is ALWAYS, it's treated like the row header with respect to its dimensions and
* is made visible.
* <p/>
* <li> If a horizontal scrollbar is needed, it is treated like the column header (see the paragraph above regarding
* the vertical scrollbar).
* <p/>
* <li> If the scrollpane has a non-<code>null</code> <code>viewportBorder</code>, then space is allocated for
* that.
* <p/>
* <li> The viewport gets the space available after accounting for the previous constraints.
* <p/>
* <li> The corner components, if provided, are aligned with the ends of the scrollbars and headers. If there is a
* vertical scrollbar, the right corners appear; if there is a horizontal scrollbar, the lower corners appear; a row
* header gets left corners, and a column header gets upper corners. </ul>
*
* @param parent the <code>Container</code> to lay out
*/
@Override
public void layoutContainer(Container parent) {
/* Sync the (now obsolete) policy fields with the
* JScrollPane.
*/
JScrollPane scrollPane = (JScrollPane) parent;
boolean flatLayout = scrollPane instanceof JideScrollPane && ((JideScrollPane) scrollPane).isFlatLayout();
vsbPolicy = scrollPane.getVerticalScrollBarPolicy();
hsbPolicy = scrollPane.getHorizontalScrollBarPolicy();
Rectangle availR = scrollPane.getBounds();
availR.x = availR.y = 0;
Insets insets = parent.getInsets();
availR.x = insets.left;
availR.y = insets.top;
availR.width -= insets.left + insets.right;
availR.height -= insets.top + insets.bottom;
/* If there's a visible column header remove the space it
* needs from the top of availR. The column header is treated
* as if it were fixed height, arbitrary width.
*/
Rectangle colHeadR = new Rectangle(0, availR.y, 0, 0);
int upperHeight = getUpperHeight();
if ((colHead != null) && (colHead.isVisible())) {
int colHeadHeight = Math.min(availR.height, upperHeight);
colHeadR.height = colHeadHeight;
availR.y += colHeadHeight;
availR.height -= colHeadHeight;
}
int subUpperHeight = getSubUpperHeight();
Rectangle subColHeadR = new Rectangle(0, availR.y, 0, 0);
if (_subColHead != null && _subColHead.isVisible()) {
int subColHeadHeight = Math.min(availR.height, subUpperHeight);
subColHeadR.height = subColHeadHeight;
availR.y += subColHeadHeight;
availR.height -= subColHeadHeight;
}
/* If there's a visible row header remove the space it needs
* from the left or right of availR. The row header is treated
* as if it were fixed width, arbitrary height.
*/
Rectangle rowHeadR = new Rectangle(0, 0, 0, 0);
if ((rowHead != null) && (rowHead.isVisible())) {
int rowHeadWidth = rowHead.getPreferredSize().width;
if (upperLeft != null && upperLeft.isVisible()) {
rowHeadWidth = Math.max(rowHeadWidth, upperLeft.getPreferredSize().width);
}
if (lowerLeft != null && lowerLeft.isVisible()) {
rowHeadWidth = Math.max(rowHeadWidth, lowerLeft.getPreferredSize().width);
}
if (_subUpperLeft != null && _subUpperLeft.isVisible()) {
rowHeadWidth = Math.max(rowHeadWidth, _subUpperLeft.getPreferredSize().width);
}
rowHeadR.width = rowHeadWidth;
availR.width -= rowHeadWidth;
rowHeadR.x = availR.x;
availR.x += rowHeadWidth;
}
/* If there's a JScrollPane.viewportBorder, remove the
* space it occupies for availR.
*/
Border viewportBorder = scrollPane.getViewportBorder();
Insets vpbInsets;
if (viewportBorder != null) {
vpbInsets = viewportBorder.getBorderInsets(parent);
availR.x += vpbInsets.left;
availR.y += vpbInsets.top;
availR.width -= vpbInsets.left + vpbInsets.right;
availR.height -= vpbInsets.top + vpbInsets.bottom;
}
else {
vpbInsets = new Insets(0, 0, 0, 0);
}
/* If there's a visible row footer remove the space it needs
* from the left or right of availR. The row footer is treated
* as if it were fixed width, arbitrary height.
*/
Rectangle rowFootR = new Rectangle(0, 0, 0, 0);
if ((_rowFoot != null) && (_rowFoot.isVisible())) {
int rowFootWidth = _rowFoot.getPreferredSize().width;
if (upperRight != null && upperRight.isVisible()) {
rowFootWidth = Math.max(rowFootWidth, upperRight.getPreferredSize().width);
}
if (_subUpperRight != null && _subUpperRight.isVisible()) {
rowFootWidth = Math.max(rowFootWidth, _subUpperRight.getPreferredSize().width);
}
if (lowerRight != null && lowerRight.isVisible()) {
rowFootWidth = Math.max(rowFootWidth, lowerRight.getPreferredSize().width);
}
rowFootR.width = rowFootWidth;
availR.width -= rowFootWidth;
rowFootR.x = availR.x + availR.width;
}
/* If there's a visible column footer remove the space it
* needs from the top of availR. The column footer is treated
* as if it were fixed height, arbitrary width.
*/
Rectangle colFootR = new Rectangle(0, availR.y, 0, 0);
int lowerHeight = getLowerHeight();
if ((_colFoot != null) && (_colFoot.isVisible())) {
int colFootHeight = Math.min(availR.height, lowerHeight);
colFootR.height = colFootHeight;
availR.height -= colFootHeight;
colFootR.y = availR.y + availR.height;
}
/* At this point availR is the space available for the viewport
* and scrollbars. rowHeadR is correct except for its height and y
* and colHeadR is correct except for its width and x. Once we're
* through computing the dimensions of these three parts we can
* go back and set the dimensions of rowHeadR.height, rowHeadR.y,
* colHeadR.width, colHeadR.x and the bounds for the corners.
*
* We'll decide about putting up scrollbars by comparing the
* viewport views preferred size with the viewports extent
* size (generally just its size). Using the preferredSize is
* reasonable because layout proceeds top down - so we expect
* the viewport to be laid out next. And we assume that the
* viewports layout manager will give the view it's preferred
* size. One exception to this is when the view implements
* Scrollable and Scrollable.getViewTracksViewport{Width,Height}
* methods return true. If the view is tracking the viewports
* width we don't bother with a horizontal scrollbar, similarly
* if view.getViewTracksViewport(Height) is true we don't bother
* with a vertical scrollbar.
*/
Component view = (viewport != null) ? viewport.getView() : null;
Dimension viewPrefSize = (view != null) ? view.getPreferredSize() : new Dimension(0, 0);
Dimension extentSize =
(viewport != null) ? viewport.toViewCoordinates(availR.getSize())
: new Dimension(0, 0);
boolean viewTracksViewportWidth = false;
boolean viewTracksViewportHeight = false;
boolean isEmpty = (availR.width < 0 || availR.height < 0);
Scrollable sv;
// Don't bother checking the Scrollable methods if there is no room
// for the viewport, we aren't going to show any scrollbars in this
// case anyway.
if (!isEmpty && view instanceof Scrollable && !flatLayout) {
sv = (Scrollable) view;
viewTracksViewportWidth = sv.getScrollableTracksViewportWidth();
viewTracksViewportHeight = sv.getScrollableTracksViewportHeight();
}
else {
sv = null;
}
/* If there's a vertical scrollbar and we need one, allocate
* space for it (we'll make it visible later). A vertical
* scrollbar is considered to be fixed width, arbitrary height.
*/
Rectangle vsbR = new Rectangle(0, isVsbCoversWholeHeight(scrollPane) ? insets.top : availR.y - vpbInsets.top, 0, 0);
boolean vsbNeeded;
if (vsbPolicy == VERTICAL_SCROLLBAR_ALWAYS) {
vsbNeeded = true;
}
else if (vsbPolicy == VERTICAL_SCROLLBAR_NEVER) {
vsbNeeded = false;
}
else if (isEmpty) {
vsbNeeded = false;
}
else { // vsbPolicy == VERTICAL_SCROLLBAR_AS_NEEDED
vsbNeeded = !viewTracksViewportHeight && (viewPrefSize.height > extentSize.height || (rowHead != null && rowHead.getView() != null && rowHead.getView().getPreferredSize().height > extentSize.height));
if (!vsbNeeded && scrollPane instanceof JideScrollPane && ((JideScrollPane) scrollPane).isKeepCornerVisible() && (_vBottom != null || _vTop != null)) {
vsbNeeded = true;
}
}
if (flatLayout) {
vsbNeeded = false;
}
if ((vsb != null) && vsbNeeded) {
adjustForVSB(true, availR, vsbR, vpbInsets, true);
extentSize = viewport.toViewCoordinates(availR.getSize());
}
/* If there's a horizontal scrollbar and we need one, allocate
* space for it (we'll make it visible later). A horizontal
* scrollbar is considered to be fixed height, arbitrary width.
*/
Rectangle hsbR = new Rectangle(isHsbCoversWholeWidth(scrollPane) ? insets.left : availR.x - vpbInsets.left, 0, 0, 0);
boolean hsbNeeded;
if (hsbPolicy == HORIZONTAL_SCROLLBAR_ALWAYS) {
hsbNeeded = true;
}
else if (hsbPolicy == HORIZONTAL_SCROLLBAR_NEVER) {
hsbNeeded = false;
}
else if (isEmpty) {
hsbNeeded = false;
}
else { // hsbPolicy == HORIZONTAL_SCROLLBAR_AS_NEEDED
hsbNeeded = !viewTracksViewportWidth && (viewPrefSize.width > extentSize.width || (colHead != null && colHead.getView() != null && colHead.getView().getPreferredSize().width > extentSize.width));
if (!hsbNeeded && scrollPane instanceof JideScrollPane && ((JideScrollPane) scrollPane).isKeepCornerVisible() && (_hLeft != null || _hRight != null)) {
hsbNeeded = true;
}
}
if (flatLayout) {
hsbNeeded = false;
}
if ((hsb != null) && hsbNeeded) {
adjustForHSB(true, availR, hsbR, vpbInsets);
/* If we added the horizontal scrollbar then we've implicitly
* reduced the vertical space available to the viewport.
* As a consequence we may have to add the vertical scrollbar,
* if that hasn't been done so already. Of course we
* don't bother with any of this if the vsbPolicy is NEVER.
*/
if ((vsb != null) && !vsbNeeded &&
(vsbPolicy != VERTICAL_SCROLLBAR_NEVER)) {
extentSize = viewport.toViewCoordinates(availR.getSize());
vsbNeeded = viewPrefSize.height > extentSize.height;
if (!vsbNeeded && scrollPane instanceof JideScrollPane && ((JideScrollPane) scrollPane).isKeepCornerVisible() && (_vBottom != null || _vTop != null)) {
vsbNeeded = true;
}
if (vsbNeeded) {
adjustForVSB(true, availR, vsbR, vpbInsets, true);
}
}
}
/* Set the size of the viewport first, and then recheck the Scrollable
* methods. Some components base their return values for the Scrollable
* methods on the size of the Viewport, so that if we don't
* ask after resetting the bounds we may have gotten the wrong
* answer.
*/
// Get the scrollPane's orientation.
boolean ltr = scrollPane.getComponentOrientation().isLeftToRight();
if (viewport != null) {
viewport.setBounds(adjustBounds(parent, availR, ltr));
// viewport.setViewSize(availR.getSize()); // to fix the strange scroll bar problem reported on http://www.jidesoft.com/forum/viewtopic.php?p=20526#20526
if (sv != null) {
extentSize = viewport.toViewCoordinates(availR.getSize());
boolean oldHSBNeeded = hsbNeeded;
boolean oldVSBNeeded = vsbNeeded;
viewTracksViewportWidth = sv.getScrollableTracksViewportWidth();
viewTracksViewportHeight = sv.getScrollableTracksViewportHeight();
if (vsb != null && vsbPolicy == VERTICAL_SCROLLBAR_AS_NEEDED && !flatLayout) {
boolean newVSBNeeded = !viewTracksViewportHeight && (viewPrefSize.height > extentSize.height || (rowHead != null && rowHead.getView() != null && rowHead.getView().getPreferredSize().height > extentSize.height));
if (!newVSBNeeded && scrollPane instanceof JideScrollPane && ((JideScrollPane) scrollPane).isKeepCornerVisible() && (_vBottom != null || _vTop != null)) {
newVSBNeeded = true;
}
if (newVSBNeeded != vsbNeeded) {
vsbNeeded = newVSBNeeded;
adjustForVSB(vsbNeeded, availR, vsbR, vpbInsets, true);
extentSize = viewport.toViewCoordinates
(availR.getSize());
}
}
if (hsb != null && hsbPolicy == HORIZONTAL_SCROLLBAR_AS_NEEDED && !flatLayout) {
boolean newHSBbNeeded = !viewTracksViewportWidth && (viewPrefSize.width > extentSize.width || (colHead != null && colHead.getView() != null && colHead.getView().getPreferredSize().width > extentSize.width));
if (!newHSBbNeeded && scrollPane instanceof JideScrollPane && ((JideScrollPane) scrollPane).isKeepCornerVisible() && (_hLeft != null || _hRight != null)) {
newHSBbNeeded = true;
}
if (newHSBbNeeded != hsbNeeded) {
hsbNeeded = newHSBbNeeded;
adjustForHSB(hsbNeeded, availR, hsbR, vpbInsets);
if ((vsb != null) && !vsbNeeded &&
(vsbPolicy != VERTICAL_SCROLLBAR_NEVER)) {
extentSize = viewport.toViewCoordinates
(availR.getSize());
vsbNeeded = viewPrefSize.height >
extentSize.height;
if (!vsbNeeded && scrollPane instanceof JideScrollPane && ((JideScrollPane) scrollPane).isKeepCornerVisible() && (_vBottom != null || _vTop != null)) {
vsbNeeded = true;
}
if (vsbNeeded) {
adjustForVSB(true, availR, vsbR, vpbInsets, true);
}
}
if (_rowFoot != null && _rowFoot.isVisible()) {
vsbR.x += rowFootR.width;
}
}
}
if (oldHSBNeeded != hsbNeeded ||
oldVSBNeeded != vsbNeeded) {
viewport.setBounds(adjustBounds(parent, availR, ltr));
// You could argue that we should recheck the
// Scrollable methods again until they stop changing,
// but they might never stop changing, so we stop here
// and don't do any additional checks.
}
}
}
/*
* We now have the final size of the viewport: availR.
* Now fixup the header and scrollbar widths/heights.
*/
vsbR.height = isVsbCoversWholeHeight(scrollPane) ? scrollPane.getHeight() - insets.bottom - insets.top : availR.height + vpbInsets.top + vpbInsets.bottom;
hsbR.width = isHsbCoversWholeWidth(scrollPane) ? scrollPane.getWidth() - vsbR.width - insets.left - insets.right : availR.width + vpbInsets.left + vpbInsets.right;
rowHeadR.height = availR.height + vpbInsets.top + vpbInsets.bottom;
rowHeadR.y = availR.y - vpbInsets.top;
colHeadR.width = availR.width + vpbInsets.left + vpbInsets.right;
colHeadR.x = availR.x - vpbInsets.left;
subColHeadR.width = colHeadR.width;
subColHeadR.x = colHeadR.x;
colFootR.x = availR.x;
colFootR.y = rowHeadR.y + rowHeadR.height;
colFootR.width = availR.width;
rowFootR.x = availR.x + availR.width;
rowFootR.y = availR.y;
rowFootR.height = availR.height;
vsbR.x += rowFootR.width;
hsbR.y += colFootR.height;
/* Set the bounds of the remaining components. The scrollbars
* are made invisible if they're not needed.
*/
if (rowHead != null) {
rowHead.setBounds(adjustBounds(parent, rowHeadR, ltr));
}
if (_rowFoot != null) {
_rowFoot.setBounds(adjustBounds(parent, rowFootR, ltr));
}
int columnHeaderHeight = isColumnHeadersHeightUnified(scrollPane) ? Math.max(colHeadR.height,
Math.max(upperLeft == null ? 0 : upperLeft.getPreferredSize().height, upperRight == null ? 0 : upperRight.getPreferredSize().height)) : 0;
int columnFooterHeight = isColumnFootersHeightUnified(scrollPane) ? Math.max(colFootR.height,
Math.max(lowerLeft == null ? 0 : lowerLeft.getPreferredSize().height, lowerRight == null ? 0 : lowerRight.getPreferredSize().height)) : 0;
if (colHead != null) {
int height = isColumnHeadersHeightUnified(scrollPane) ? columnHeaderHeight : Math.min(colHeadR.height, colHead.getPreferredSize().height);
colHead.setBounds(adjustBounds(parent, new Rectangle(colHeadR.x, colHeadR.y + colHeadR.height - height, colHeadR.width, height), ltr));
}
if (_subColHead != null) {
_subColHead.setBounds(adjustBounds(parent, subColHeadR, ltr));
}
if (_colFoot != null) {
int height = isColumnFootersHeightUnified(scrollPane) ? columnFooterHeight : Math.min(colFootR.height, _colFoot.getPreferredSize().height);
_colFoot.setBounds(adjustBounds(parent, new Rectangle(colFootR.x, colFootR.y, colFootR.width, height), ltr));
}
else {
if (isColumnFootersHeightUnified(scrollPane)) {
columnFooterHeight = hsbR.height;
}
}
if (vsb != null) {
if (vsbNeeded) {
vsb.setVisible(true);
if (vsbPolicy == VERTICAL_SCROLLBAR_AS_NEEDED && !isEmpty && !(!viewTracksViewportHeight && (viewPrefSize.height > extentSize.height || (rowHead != null && rowHead.getView() != null && rowHead.getView().getPreferredSize().height > extentSize.height)))) {
vsb.setVisible(false);
}
if (_vTop == null && _vBottom == null)
vsb.setBounds(adjustBounds(parent, vsbR, ltr));
else {
Rectangle rect = new Rectangle(vsbR);
if (_vTop != null) {
Dimension dim = _vTop.getPreferredSize();
rect.y += dim.height;
rect.height -= dim.height;
_vTop.setVisible(true);
_vTop.setBounds(adjustBounds(parent, new Rectangle(vsbR.x, vsbR.y, vsbR.width, dim.height), ltr));
}
if (_vBottom != null) {
Dimension dim = _vBottom.getPreferredSize();
rect.height -= dim.height;
_vBottom.setVisible(true);
_vBottom.setBounds(adjustBounds(parent, new Rectangle(vsbR.x, vsbR.y + vsbR.height - dim.height, vsbR.width, dim.height), ltr));
}
vsb.setBounds(adjustBounds(parent, rect, ltr));
}
}
else {
if (viewPrefSize.height > extentSize.height && !flatLayout) {
vsb.setVisible(true);
vsb.setBounds(adjustBounds(parent, new Rectangle(vsbR.x, vsbR.y, 0, vsbR.height), ltr));
}
else {
vsb.setVisible(false);
}
if (_vTop != null)
_vTop.setVisible(false);
if (_vBottom != null)
_vBottom.setVisible(false);
}
}
if (hsb != null) {
if (hsbNeeded) {
hsb.setVisible(true);
if (hsbPolicy == HORIZONTAL_SCROLLBAR_AS_NEEDED && !isEmpty && !(!viewTracksViewportWidth && (viewPrefSize.width > extentSize.width || (colHead != null && colHead.getView() != null && colHead.getView().getPreferredSize().width > extentSize.width)))) {
hsb.setVisible(false);
}
if (_hLeft == null && _hRight == null)
hsb.setBounds(adjustBounds(parent, hsbR, ltr));
else {
Rectangle rect = new Rectangle(hsbR);
if (_hLeft != null) {
Dimension dim = _hLeft.getPreferredSize();
rect.x += dim.width;
rect.width -= dim.width;
_hLeft.setVisible(true);
_hLeft.setBounds(adjustBounds(parent, new Rectangle(hsbR.x, hsbR.y, dim.width, hsbR.height), ltr));
_hLeft.doLayout();
}
if (_hRight != null) {
Dimension dim = _hRight.getPreferredSize();
rect.width -= dim.width;
_hRight.setVisible(true);
_hRight.setBounds(adjustBounds(parent, new Rectangle(hsbR.x + hsbR.width - dim.width, hsbR.y, dim.width, hsbR.height), ltr));
}
hsb.setBounds(adjustBounds(parent, rect, ltr));
}
}
else {
if (viewPrefSize.width > extentSize.width && !flatLayout) {
hsb.setVisible(true);
hsb.setBounds(adjustBounds(parent, new Rectangle(hsbR.x, hsbR.y, hsbR.width, 0), ltr));
}
else {
hsb.setVisible(false);
}
if (_hLeft != null)
_hLeft.setVisible(false);
if (_hRight != null)
_hRight.setVisible(false);
}
}
if (lowerLeft != null && lowerLeft.isVisible()) {
int height = isColumnFootersHeightUnified(scrollPane) ? columnFooterHeight : Math.min(lowerLeft.getPreferredSize().height, colFootR.height);
lowerLeft.setBounds(adjustBounds(parent, new Rectangle(rowHeadR.x, colFootR.y != 0 ? colFootR.y : hsbR.y, rowHeadR.width, height), ltr));
}
if (lowerRight != null && lowerRight.isVisible()) {
int height = isColumnFootersHeightUnified(scrollPane) ? columnFooterHeight : Math.min(lowerRight.getPreferredSize().height, colFootR.height);
lowerRight.setBounds(adjustBounds(parent, new Rectangle(rowFootR.x, colFootR.y != 0 ? colFootR.y : hsbR.y, rowFootR.width + (isVsbCoversWholeHeight(scrollPane) || rowFootR.width != 0 ? 0 : vsbR.width), height), ltr));
}
if (upperLeft != null && upperLeft.isVisible()) {
int height = isColumnHeadersHeightUnified(scrollPane) ? columnHeaderHeight : Math.min(upperLeft.getPreferredSize().height, colHeadR.height);
upperLeft.setBounds(adjustBounds(parent, new Rectangle(rowHeadR.x, colHeadR.y + colHeadR.height - height, rowHeadR.width, height), ltr));
}
if (upperRight != null && upperRight.isVisible()) {
int height = isColumnHeadersHeightUnified(scrollPane) ? columnHeaderHeight : Math.min(upperRight.getPreferredSize().height, colHeadR.height);
upperRight.setBounds(adjustBounds(parent, new Rectangle(rowFootR.x, colHeadR.y + colHeadR.height - height, rowFootR.width + (isVsbCoversWholeHeight(scrollPane) || rowFootR.width != 0 ? 0 : vsbR.width), height), ltr));
}
if (_subUpperLeft != null && _subUpperLeft.isVisible()) {
int height = Math.min(_subUpperLeft.getPreferredSize().height, getSubUpperHeight());
_subUpperLeft.setBounds(adjustBounds(parent, new Rectangle(rowHeadR.x, subColHeadR.y + subColHeadR.height - height, rowHeadR.width, height), ltr));
}
if (_subUpperRight != null && _subUpperRight.isVisible()) {
int height = Math.min(_subUpperRight.getPreferredSize().height, getSubUpperHeight());
_subUpperRight.setBounds(adjustBounds(parent, new Rectangle(rowFootR.x, subColHeadR.y + subColHeadR.height - height, rowFootR.width + (isVsbCoversWholeHeight(scrollPane) || rowFootR.width != 0 ? 0 : vsbR.width), height), ltr));
}
}
private Rectangle adjustBounds(Container container, Rectangle rect, boolean ltr) {
if (ltr) {
return rect;
}
else {
Rectangle r = new Rectangle(rect);
int w = container.getWidth();
r.x = w - (rect.x + rect.width);
return r;
}
}
//
// Adjusts the <code>Rectangle</code> <code>available</code> based on if the vertical scrollbar is needed
// (<code>wantsVSB</code>). The location of the vsb is updated in <code>vsbR</code>, and the viewport border insets
// (<code>vpbInsets</code>) are used to offset the vsb. This is only called when <code>wantsVSB</code> has changed,
// eg you shouldn't invoke adjustForVSB(true) twice.
//
private void adjustForVSB(boolean wantsVSB, Rectangle available,
Rectangle vsbR, Insets vpbInsets,
boolean leftToRight) {
int oldWidth = vsbR.width;
if (wantsVSB) {
int vsbWidth = Math.max(0, vsb.getPreferredSize().width);
available.width -= vsbWidth;
vsbR.width = vsbWidth;
if (leftToRight) {
vsbR.x = available.x + available.width + vpbInsets.right;
}
else {
vsbR.x = available.x - vpbInsets.left;
available.x += vsbWidth;
}
}
else {
available.width += oldWidth;
}
}
//
// Adjusts the <code>Rectangle</code> <code>available</code> based on if the horizontal scrollbar is needed
// (<code>wantsHSB</code>). The location of the hsb is updated in <code>hsbR</code>, and the viewport border insets
// (<code>vpbInsets</code>) are used to offset the hsb. This is only called when <code>wantsHSB</code> has changed,
// eg you shouldn't invoked adjustForHSB(true) twice.
//
private void adjustForHSB(boolean wantsHSB, Rectangle available,
Rectangle hsbR, Insets vpbInsets) {
int oldHeight = hsbR.height;
if (wantsHSB) {
int hsbHeight = Math.max(0, hsb.getPreferredSize().height);
available.height -= hsbHeight;
hsbR.y = available.y + available.height + vpbInsets.bottom;
hsbR.height = hsbHeight;
}
else {
available.height += oldHeight;
}
}
/**
* The UI resource version of <code>ScrollPaneLayout</code>.
*/
static class UIResource extends JideScrollPaneLayout implements javax.swing.plaf.UIResource {
private static final long serialVersionUID = 1057343395078846689L;
}
}