org.pushingpixels.lafwidget.scroll.TweakedScrollPaneLayout Maven / Gradle / Ivy
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/*
* Copyright (c) 2005-2010 Laf-Widget Kirill Grouchnikov. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* o Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* o Neither the name of Laf-Widget Kirill Grouchnikov nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.pushingpixels.lafwidget.scroll;
import javax.swing.*;
import javax.swing.border.Border;
import java.awt.*;
/**
* A hideous hack to allow the display of the selector's button even when only
* one scrollBar is visible.
*
* Contributed by the original author under BSD license. Also appears in the JDNC Incubator.
*
* @author weebib (Pierre LE LANNIC)
*/
public class TweakedScrollPaneLayout extends ScrollPaneLayout {
private void superlayoutContainer(Container parent) {
JScrollPane scrollPane = (JScrollPane) parent;
vsbPolicy = scrollPane.getVerticalScrollBarPolicy();
hsbPolicy = scrollPane.getHorizontalScrollBarPolicy();
Rectangle availR = scrollPane.getBounds();
Insets insets = parent.getInsets();
availR.x = insets.left;
availR.y = insets.top;
availR.width -= insets.left + insets.right;
availR.height -= insets.top + insets.bottom;
boolean leftToRight = scrollPane.getComponentOrientation()
.isLeftToRight();
Rectangle colHeadR = new Rectangle(0, availR.y, 0, 0);
if ((colHead != null) && (colHead.isVisible())) {
int colHeadHeight = Math.min(availR.height, colHead
.getPreferredSize().height);
colHeadR.height = colHeadHeight;
availR.y += colHeadHeight;
availR.height -= colHeadHeight;
}
Rectangle rowHeadR = new Rectangle(0, 0, 0, 0);
if ((rowHead != null) && (rowHead.isVisible())) {
int rowHeadWidth = Math.min(availR.width, rowHead
.getPreferredSize().width);
rowHeadR.width = rowHeadWidth;
availR.width -= rowHeadWidth;
if (leftToRight) {
rowHeadR.x = availR.x;
availR.x += rowHeadWidth;
} else {
rowHeadR.x = availR.x + availR.width;
}
}
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);
}
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;
if (!isEmpty && view instanceof Scrollable) {
sv = (Scrollable) view;
viewTracksViewportWidth = sv.getScrollableTracksViewportWidth();
viewTracksViewportHeight = sv.getScrollableTracksViewportHeight();
} else {
sv = null;
}
Rectangle vsbR = new Rectangle(0, availR.y - vpbInsets.top, 0, 0);
boolean vsbNeeded;
if (isEmpty) {
vsbNeeded = false;
} else if (vsbPolicy == VERTICAL_SCROLLBAR_ALWAYS) {
vsbNeeded = true;
} else if (vsbPolicy == VERTICAL_SCROLLBAR_NEVER) {
vsbNeeded = false;
} else { // vsbPolicy == VERTICAL_SCROLLBAR_AS_NEEDED
vsbNeeded = !viewTracksViewportHeight
&& (viewPrefSize.height > extentSize.height);
}
if ((vsb != null) && vsbNeeded) {
adjustForVSB(true, availR, vsbR, vpbInsets, leftToRight);
extentSize = viewport.toViewCoordinates(availR.getSize());
}
Rectangle hsbR = new Rectangle(availR.x - vpbInsets.left, 0, 0, 0);
boolean hsbNeeded;
if (isEmpty) {
hsbNeeded = false;
} else if (hsbPolicy == HORIZONTAL_SCROLLBAR_ALWAYS) {
hsbNeeded = true;
} else if (hsbPolicy == HORIZONTAL_SCROLLBAR_NEVER) {
hsbNeeded = false;
} else { // hsbPolicy == HORIZONTAL_SCROLLBAR_AS_NEEDED
hsbNeeded = !viewTracksViewportWidth
&& (viewPrefSize.width > extentSize.width);
}
if ((hsb != null) && hsbNeeded) {
adjustForHSB(true, availR, hsbR, vpbInsets);
if ((vsb != null) && !vsbNeeded
&& (vsbPolicy != VERTICAL_SCROLLBAR_NEVER)) {
extentSize = viewport.toViewCoordinates(availR.getSize());
vsbNeeded = viewPrefSize.height > extentSize.height;
if (vsbNeeded) {
adjustForVSB(true, availR, vsbR, vpbInsets, leftToRight);
// Hack to correct Bug 6411225
// I don't actually measure the consequences of this bug
// "fix"
if (!leftToRight) {
hsbR.x += vsbR.width;
}
// end of hack
}
}
}
if (viewport != null) {
viewport.setBounds(availR);
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) {
boolean newVSBNeeded = !viewTracksViewportHeight
&& (viewPrefSize.height > extentSize.height);
if (newVSBNeeded != vsbNeeded) {
vsbNeeded = newVSBNeeded;
adjustForVSB(vsbNeeded, availR, vsbR, vpbInsets,
leftToRight);
extentSize = viewport.toViewCoordinates(availR
.getSize());
}
}
if (hsb != null && hsbPolicy == HORIZONTAL_SCROLLBAR_AS_NEEDED) {
boolean newHSBbNeeded = !viewTracksViewportWidth
&& (viewPrefSize.width > extentSize.width);
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) {
adjustForVSB(true, availR, vsbR, vpbInsets,
leftToRight);
}
}
}
}
if (oldHSBNeeded != hsbNeeded || oldVSBNeeded != vsbNeeded) {
viewport.setBounds(availR);
}
}
}
vsbR.height = availR.height + vpbInsets.top + vpbInsets.bottom;
hsbR.width = 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;
if (rowHead != null) {
rowHead.setBounds(rowHeadR);
}
if (colHead != null) {
colHead.setBounds(colHeadR);
}
if (vsb != null) {
if (vsbNeeded) {
vsb.setVisible(true);
vsb.setBounds(vsbR);
} else {
vsb.setVisible(false);
}
}
if (hsb != null) {
if (hsbNeeded) {
hsb.setVisible(true);
hsb.setBounds(hsbR);
} else {
hsb.setVisible(false);
}
}
// bug 6411225 ????????
if (lowerLeft != null) {
lowerLeft.setBounds(leftToRight ? rowHeadR.x : vsbR.x, hsbR.y,
leftToRight ? rowHeadR.width : vsbR.width, hsbR.height);
}
if (lowerRight != null) {
lowerRight.setBounds(leftToRight ? vsbR.x : rowHeadR.x, hsbR.y,
leftToRight ? vsbR.width : rowHeadR.width, hsbR.height);
}
if (upperLeft != null) {
upperLeft.setBounds(leftToRight ? rowHeadR.x : vsbR.x, colHeadR.y,
leftToRight ? rowHeadR.width : vsbR.width, colHeadR.height);
}
if (upperRight != null) {
upperRight.setBounds(leftToRight ? vsbR.x : rowHeadR.x, colHeadR.y,
leftToRight ? vsbR.width : rowHeadR.width, colHeadR.height);
}
}
private void adjustForVSB(boolean wantsVSB, Rectangle available,
Rectangle vsbR, Insets vpbInsets, boolean leftToRight) {
int oldWidth = vsbR.width;
if (wantsVSB) {
int vsbWidth = Math.max(0, Math.min(vsb.getPreferredSize().width,
available.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;
}
}
private void adjustForHSB(boolean wantsHSB, Rectangle available,
Rectangle hsbR, Insets vpbInsets) {
int oldHeight = hsbR.height;
if (wantsHSB) {
int hsbHeight = Math.max(0, Math.min(available.height, hsb
.getPreferredSize().height));
available.height -= hsbHeight;
hsbR.y = available.y + available.height + vpbInsets.bottom;
hsbR.height = hsbHeight;
} else {
available.height += oldHeight;
}
}
public void layoutContainer(Container parent) {
superlayoutContainer(parent);
boolean isLeftToRight = parent.getComponentOrientation()
.isLeftToRight();
if (isLeftToRight && lowerRight == null)
return;
if (!isLeftToRight && lowerLeft == null)
return;
boolean onlyVsb = (vsb != null) && vsb.isVisible()
&& ((hsb == null) || ((hsb != null) && (!hsb.isVisible())));
if (onlyVsb) {
Rectangle vsbBounds = vsb.getBounds();
int delta = (hsb == null) ? ((Integer) (UIManager
.get("ScrollBar.width"))).intValue() : hsb
.getPreferredSize().height;
vsbBounds.height -= delta;
vsb.setBounds(vsbBounds);
if (isLeftToRight) {
lowerRight.setBounds(vsbBounds.x, vsbBounds.y
+ vsbBounds.height, vsbBounds.width, delta);
lowerRight.setVisible(true);
} else {
lowerLeft.setBounds(vsbBounds.x,
vsbBounds.y + vsbBounds.height, vsbBounds.width, delta);
lowerLeft.setVisible(true);
}
}
boolean onlyHsb = (hsb != null) && hsb.isVisible()
&& ((vsb == null) || ((vsb != null) && (!vsb.isVisible())));
if (onlyHsb) {
Rectangle hsbBounds = hsb.getBounds();
int delta = (vsb == null) ? ((Integer) (UIManager
.get("ScrollBar.width"))).intValue() : vsb
.getPreferredSize().width;
hsbBounds.width -= delta;
if (!isLeftToRight) {
hsbBounds.x += delta;
}
hsb.setBounds(hsbBounds);
if (isLeftToRight) {
lowerRight.setBounds(hsbBounds.x + hsbBounds.width,
hsbBounds.y, delta, hsbBounds.height);
lowerRight.setVisible(true);
} else {
lowerLeft.setBounds(hsbBounds.x - delta, hsbBounds.y, delta,
hsbBounds.height);
lowerLeft.setVisible(true);
}
}
}
}