processing4/app/src/processing/app/contrib/ListPanel.java at main · processing/processing4 · GitHub

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/* -*- mode: java; c-basic-offset: 2; indent-tabs-mode: nil -*- */

Part of the Processing project - http://processing.org

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License version 2

as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License along

with this program; if not, write to the Free Software Foundation, Inc.

59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

package processing.app.contrib;

import java.awt.*;

import java.awt.geom.Arc2D;

import java.awt.geom.Ellipse2D;

import java.awt.geom.Line2D;

import java.awt.image.BufferedImage;

import java.util.List;

import java.util.*;

import java.util.concurrent.ConcurrentHashMap;

import javax.swing.*;

import javax.swing.RowSorter.SortKey;

import javax.swing.table.*;

import processing.app.Util;

import processing.app.ui.Theme;

import processing.app.laf.PdeScrollBarUI;

import processing.app.ui.Toolkit;

// The "Scrollable" implementation and its methods here take care of preventing

// the scrolling area from running exceptionally slowly. Not sure why they're

// necessary in the first place, however. Is that hiding a bigger problem?

// It also allows the description text in the panels to wrap properly.

public class ListPanel extends JPanel implements Scrollable {

ContributionTab contributionTab;

Map<Contribution, StatusDetail> detailForContrib =

new ConcurrentHashMap<>();

private final Contribution.Filter filter;

private StatusDetail selectedDetail;

protected ContributionRowFilter rowFilter;

protected JTable table;

protected TableRowSorter<ContributionTableModel> sorter;

protected ContributionTableModel model;

// state icons appearing to the left side of the list

static final int ICON_SIZE = 16;

Icon upToDateIcon;

Icon updateAvailableIcon;

Icon incompatibleIcon;

Icon downloadingIcon;

// used in the list next to the creator name

Icon foundationIcon;

Color headerFgColor;

Color headerBgColor;

Color sectionColor;

Color rowColor;

Color textColor;

Color selectionColor;

Color textColorIncompatible;

Color selectionColorIncompatible;

JScrollPane scrollPane;

static final SectionHeaderContribution[] sectionHeaders = {

new SectionHeaderContribution(ContributionType.LIBRARY),

new SectionHeaderContribution(ContributionType.MODE),

new SectionHeaderContribution(ContributionType.TOOL),

new SectionHeaderContribution(ContributionType.EXAMPLES)

};

public ListPanel(final ContributionTab contributionTab,

final Contribution.Filter filter,

final boolean enableSections,

final ContributionColumn... columns) {

this.contributionTab = contributionTab;

this.filter = filter;

model = new ContributionTableModel(columns); /* {

@Override

public void fireTableDataChanged() {

new Exception().printStackTrace(System.out);

super.fireTableDataChanged();

}

};*/

model.enableSections(enableSections);

table = new JTable(model) {

@Override

public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {

Component c = super.prepareRenderer(renderer, row, column);

Object rowValue = getValueAt(row, column);

if (rowValue instanceof SectionHeaderContribution) {

c.setBackground(sectionColor);

} else if (isRowSelected(row)) {

if (((Contribution) rowValue).isCompatible()) {

c.setBackground(selectionColor);

} else {

c.setBackground(selectionColorIncompatible);

}

} else {

c.setBackground(rowColor);

}

return c;

}

@Override

public void changeSelection(int rowIndex, int columnIndex, boolean toggle, boolean extend) {

// disallow selection of the header lines

if (!(getValueAt(rowIndex, columnIndex) instanceof SectionHeaderContribution)) {

super.changeSelection(rowIndex, columnIndex, toggle, extend);

}

};

scrollPane = new JScrollPane(table);

scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);

scrollPane.getVerticalScrollBar().setUI(new PdeScrollBarUI("manager.scrollbar"));

scrollPane.setBorder(BorderFactory.createEmptyBorder());

table.setFillsViewportHeight(true);

table.setDefaultRenderer(Contribution.class, new ContribCellRenderer());

table.setRowHeight(Toolkit.zoom(28));

table.setRowMargin(Toolkit.zoom(6));

TableColumnModel tcm = table.getColumnModel();

tcm.setColumnMargin(0);

tcm.getColumn(0).setMaxWidth(ManagerFrame.STATUS_WIDTH);

tcm.getColumn(2).setMinWidth(ManagerFrame.AUTHOR_WIDTH);

tcm.getColumn(2).setMaxWidth(ManagerFrame.AUTHOR_WIDTH);

table.setShowGrid(false);

table.setColumnSelectionAllowed(false);

table.setCellSelectionEnabled(false);

table.setAutoCreateColumnsFromModel(true);

table.setAutoCreateRowSorter(false);

table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

table.getSelectionModel().addListSelectionListener(event -> {

// This is called twice for each mouse click, once on mouse press with

// event.getValueIsAdjusting()) set true, and again when the mouse is

// released where adjusting will be set false. But instead of only

// responding to one or the other, need to fire on both so that the

// selection updates while the user drags mouse across the list (and

// not just when released). Using the arrow keys will only fire once

// because adjusting will be false (no ongoing drag with keys).

int row = table.getSelectedRow();

if (row != -1) {

Contribution contrib = (Contribution) table.getValueAt(row, 0);

setSelectedDetail(detailForContrib.get(contrib));

// Preventing the focus to move out of filterField after typing every character

if (!contributionTab.filterHasFocus()) {

table.requestFocusInWindow();

}

});

sorter = new TableRowSorter<>(model);

table.setRowSorter(sorter);

rowFilter = new ContributionRowFilter(filter);

sorter.setRowFilter(rowFilter);

for (int i = 0; i < model.getColumnCount(); i++) {

if (model.columns[i] == ContributionColumn.NAME) {

sorter.setSortKeys(Collections.singletonList(new SortKey(i, SortOrder.ASCENDING)));

}

sorter.setComparator(i, model.columns[i].getComparator());

}

table.getTableHeader().setDefaultRenderer(new ContribHeaderRenderer());

table.getTableHeader().setReorderingAllowed(false);

table.getTableHeader().setResizingAllowed(true);

table.setVisible(true);

setOpaque(true);

setLayout(new BorderLayout());

add(scrollPane, BorderLayout.CENTER);

}

protected void updateTheme() {

headerFgColor = Theme.getColor("manager.list.header.fgcolor");

headerBgColor = Theme.getColor("manager.list.header.bgcolor");

sectionColor = Theme.getColor("manager.list.section.color");

textColor = Theme.getColor("manager.list.text.color");

selectionColor = Theme.getColor("manager.list.selection.color");

textColorIncompatible = Theme.getColor("manager.list.incompatible.text.color");

selectionColorIncompatible = Theme.getColor("manager.list.incompatible.selection.color");

rowColor = Theme.getColor("manager.list.background.color");

table.setBackground(rowColor);

foundationIcon = Toolkit.renderIcon("manager/foundation", Theme.get("manager.list.foundation.color"), ICON_SIZE);

upToDateIcon = Toolkit.renderIcon("manager/list-up-to-date", Theme.get("manager.list.icon.color"), ICON_SIZE);

updateAvailableIcon = Toolkit.renderIcon("manager/list-update-available", Theme.get("manager.list.icon.color"), ICON_SIZE);

incompatibleIcon = Toolkit.renderIcon("manager/list-incompatible", Theme.get("manager.list.icon.color"), ICON_SIZE);

downloadingIcon = Toolkit.renderIcon("manager/list-downloading", Theme.get("manager.list.icon.color"), ICON_SIZE);

((PdeScrollBarUI) scrollPane.getVerticalScrollBar().getUI()).updateTheme();

}

/**

* Render the pie chart or indeterminate spinner for table rows.

* @param amount 0..1 for a pie, -1 for indeterminate

* @param hash unique offset to prevent indeterminate from being in the same position

* @return properly scalable ImageIcon for rendering in the Table at 1x or 2x

Icon renderProgressIcon(float amount, int hash) {

// final int FFS_JAVA2D = ICON_SIZE - 2;

final float FFS_JAVA2D = ICON_SIZE - 1.5f;

// final int scale = Toolkit.highResImages() ? 2 : 1;

// final int dim = ICON_SIZE * scale;

final int dim = ICON_SIZE * (Toolkit.highResImages() ? 2 : 1);

// Image image = Toolkit.offscreenGraphics(this, ICON_SIZE, ICON_SIZE);

Image image = new BufferedImage(dim, dim, BufferedImage.TYPE_INT_ARGB);

// Graphics2D g2 = (Graphics2D) image.getGraphics();

// Toolkit.prepareGraphics(g2);

Graphics2D g2 = Toolkit.prepareGraphics(image);

// g2.setColor(rowColor);

// g2.fillRect(0, 0, ICON_SIZE, ICON_SIZE);

g2.translate(0.5, 0.5);

g2.setStroke(new BasicStroke(1.5f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND));

Color iconColor = Theme.getColor("manager.list.icon.color");

g2.setColor(iconColor);

// g2.drawOval(0, 0, FFS_JAVA2D, FFS_JAVA2D);

Ellipse2D circle = new Ellipse2D.Float(0, 0, FFS_JAVA2D, FFS_JAVA2D);

if (amount != -1) {

// draw ever-growing pie wedge

g2.draw(circle);

int theta = (int) (360 * amount);

// g2.fillArc(0, 0, ICON_SIZE-1, ICON_SIZE-1, 90, -theta);

Arc2D wedge = new Arc2D.Float(0, 0, FFS_JAVA2D, FFS_JAVA2D, 90, -theta, Arc2D.PIE);

g2.fill(wedge);

} else {

// draw indeterminate state

g2.fill(circle);

g2.translate(FFS_JAVA2D/2, FFS_JAVA2D/2);

// offset by epoch to avoid integer out of bounds (the date is in 2001)

final long EPOCH = 1500000000000L + Math.abs((long) hash);

int angle = (int) ((System.currentTimeMillis() - EPOCH) / 20) % 360;

g2.rotate(angle);

g2.setColor(rowColor);

float lineRadius = FFS_JAVA2D * 0.3f;

g2.draw(new Line2D.Float(-lineRadius, 0, lineRadius, 0));

}

g2.dispose();

return Toolkit.wrapIcon(image);

}

// TODO remove this, yuck [fry 220313]

protected int getScrollBarWidth() {

return scrollPane.getVerticalScrollBar().getPreferredSize().width;

}

private static int getContributionStatusRank(Contribution c) {

// Uninstalled items are at the bottom of the sort order

int pos = 4;

if (c.isInstalled()) {

pos = 1;

if (ContributionListing.getInstance().hasUpdates(c)) {

pos = 2;

}

if (!c.isCompatible()) {

// This is weird because it means some grayed-out items will

// show up before non-gray items. We probably need another

// state icon for 'installed but incompatible' [fry 220116]

pos = 3;

}

return pos;

}

// . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

class ContribHeaderRenderer extends DefaultTableCellRenderer {

public ContribHeaderRenderer() {

setHorizontalTextPosition(LEFT);

setOpaque(true);

}

/**

* Returns the default table header cell renderer.

* <P>

* If the column is sorted, the appropriate icon is retrieved from the

* current Look and Feel, and a border appropriate to a table header cell

* is applied.

* <P>

* Subclasses may override this method to provide custom content or

* formatting.

* @param table the <code>JTable</code>.

* @param value the value to assign to the header cell

* @param isSelected This parameter is ignored.

* @param hasFocus This parameter is ignored.

* @param row This parameter is ignored.

* @param column the column of the header cell to render

* @return the default table header cell renderer

@Override

public Component getTableCellRendererComponent(JTable table, Object value,

boolean isSelected, boolean hasFocus, int row, int column) {

super.getTableCellRendererComponent(table, value,

isSelected, hasFocus, row, column);

setForeground(headerFgColor);

setText(getText() + getSortText(table, column));

putClientProperty("FlatLaf.styleClass", "small");

setBackground(headerBgColor);

setBorder(null);

return this;

}

// /**

// * Return an icon suitable to the primary sorted column,

// * or null if the column is not the primary sort key.

// *

// * @param table the <code>JTable</code>.

// * @param column the column index.

// * @return the sort icon, or null if the column is unsorted.

// */

// private Icon getSortIcon(JTable table, int column) {

// SortKey sortKey = getSortKey(table);

// if (sortKey != null && table.convertColumnIndexToView(sortKey.getColumn()) == column) {

// switch (sortKey.getSortOrder()) {

// case ASCENDING:

// return UIManager.getIcon("Table.ascendingSortIcon");

// case DESCENDING:

// return UIManager.getIcon("Table.descendingSortIcon");

// }

// return null;

// }

private String getSortText(JTable table, int column) {

SortKey sortKey = getSortKey(table);

if (sortKey != null && table.convertColumnIndexToView(sortKey.getColumn()) == column) {

switch (sortKey.getSortOrder()) {

case ASCENDING -> { return " ↓"; }

case DESCENDING -> { return " ↑"; }

}

// if not sorting on this column

return "";

}

/**

* Returns the current sort key, or null if the column is unsorted.

* @param table the table

* @return the SortKey, or null if the column is unsorted

protected SortKey getSortKey(JTable table) {

return Optional.ofNullable(table.getRowSorter())

.map(RowSorter::getSortKeys)

.map(columns -> columns.isEmpty() ? null : columns.get(0))

.orElse(null);

}

// . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

private class ContribCellRenderer extends DefaultTableCellRenderer {

@Override

public void setVerticalAlignment(int alignment) {

super.setVerticalAlignment(SwingConstants.CENTER);

}

@Override

public Component getTableCellRendererComponent(JTable table, Object value,

boolean isSelected,

boolean hasFocus, int row,

int column) {

Contribution contribution = (Contribution) value;

JLabel label = new JLabel();

ContributionColumn col = model.columns[column];

// Removing this workaround for 4.1.2; likely fixed by change

// for the concurrent Set used with allContributions list.

if (value == null) {

// Working on https://github.com/processing/processing/issues/3667

//System.err.println("null value seen in getTableCellRendererComponent()");

// TODO this is now working, but the underlying issue is not fixed

return label;

}

label.setOpaque(true);

if (value instanceof SectionHeaderContribution && col != ContributionColumn.NAME) {

return label;

}

switch (col) {

case STATUS, STATUS_NO_HEADER -> configureStatusColumnLabel(label, contribution);

case NAME -> configureNameColumnLabel(table, label, contribution);

case AUTHOR -> configureAuthorsColumnLabel(label, contribution);

case INSTALLED_VERSION -> label.setText(contribution.getBenignVersion());

case AVAILABLE_VERSION -> label.setText(ContributionListing.getInstance().getLatestPrettyVersion(contribution));

}

if (contribution instanceof SectionHeaderContribution) {

// grouping color for libraries, modes, tools headers in updates panel

label.setForeground(textColorIncompatible);

} else if (contribution.isCompatible()) {

label.setForeground(textColor);

} else {

label.setForeground(textColorIncompatible);

}

return label;

}

private void configureStatusColumnLabel(JLabel label, Contribution contribution) {

Icon icon = null;

StatusDetail detail = detailForContrib.get(contribution);

if (detail != null && (detail.updateInProgress || detail.installInProgress)) {

// Display "loading" icon if download/install in progress

// icon = downloadingIcon;

// float amount = detail.getProgressAmount();

// icon = (amount == -1) ? downloadingIcon : renderProgressIcon(amount);

icon = renderProgressIcon(detail.getProgressAmount(), contribution.hashCode());

} else if (contribution.isInstalled()) {

if (!contribution.isCompatible()) {

icon = incompatibleIcon;

} else if (ContributionListing.getInstance().hasUpdates(contribution)) {

icon = updateAvailableIcon;

} else if (detail != null && (detail.installInProgress || detail.updateInProgress)) {

icon = downloadingIcon;

} else {

icon = upToDateIcon;

}

label.setIcon(icon);

label.setHorizontalAlignment(SwingConstants.CENTER);

}

private void configureNameColumnLabel(JTable table, JLabel label, Contribution contribution) {

// Generating ellipses based on fontMetrics

final Font boldFont = Theme.getFont("manager.list.heavy.font");

FontMetrics fontMetrics = table.getFontMetrics(boldFont);

int colSize = table.getColumnModel().getColumn(1).getWidth();

int currentWidth = fontMetrics.stringWidth(contribution.getName() + " | …");

String sentence = Util.removeMarkDownLinks(contribution.getSentence());

StringBuilder text =

new StringBuilder("<html><body><font face=\"")

.append(boldFont.getName())

.append("\">")

.append(contribution.getName());

if (sentence.length() == 0) {

text.append("</font>");

} else {

int index;

for (index = 0; index < sentence.length(); index++) {

currentWidth += fontMetrics.charWidth(sentence.charAt(index));

if (currentWidth >= colSize) {

break;

}

text.append(" | </font>").append(sentence, 0, index);

// Adding ellipses only if text doesn't fit into the column

if (index != sentence.length()) {

text.append("…");

}

text.append("</body></html>");

label.setText(text.toString());

}

private void configureAuthorsColumnLabel(JLabel label, Contribution contribution) {

if (contribution.isFoundation()) {

label.setIcon(foundationIcon);

}

String authorList = contribution.getAuthorList();

String name = Util.removeMarkDownLinks(authorList);

label.setText(name);

label.setHorizontalAlignment(SwingConstants.LEFT);

label.setForeground(Color.BLACK);

label.setFont(Theme.getFont("manager.list.heavy.font"));

}

protected enum ContributionColumn {

STATUS(" Status"),

NAME("Name"),

AUTHOR("Author"),

INSTALLED_VERSION("Installed"),

AVAILABLE_VERSION("Available"),

STATUS_NO_HEADER("");

final String name;

ContributionColumn(String name) {

this.name = name;

}

Comparator<Contribution> getComparator() {

Comparator<Contribution> comparator = Comparator.comparing(Contribution::getType)

.thenComparingInt(contribution -> contribution instanceof SectionHeaderContribution ? 0 : 1);

if (this == STATUS || this == STATUS_NO_HEADER) {

return comparator.thenComparingInt(ListPanel::getContributionStatusRank);

} else if (this == AUTHOR) {

return comparator.thenComparing(contribution -> Util.removeMarkDownLinks(contribution.getAuthorList()));

} else { // default case, or this == NAME

return comparator.thenComparing(Contribution::getName, String.CASE_INSENSITIVE_ORDER);

}

// . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

static class ContributionTableModel extends AbstractTableModel {

ContributionColumn[] columns = {

ContributionColumn.STATUS,

ContributionColumn.NAME,

ContributionColumn.AUTHOR

};

boolean sectionsEnabled;

ContributionTableModel(ContributionColumn... columns) {

if (columns.length > 0) {

this.columns = columns;

}

@Override

public int getRowCount() {

return ContributionListing.getAllContribs().size() + (sectionsEnabled ? 4 : 0);

}

@Override

public int getColumnCount() {

return columns.length;

}

@Override

public String getColumnName(int column) {

if (column < 0 || column > columns.length) {

return "";

}

return columns[column].name;

}

@Override

public Class<?> getColumnClass(int columnIndex) {

return Contribution.class;

}

@Override

public Object getValueAt(int rowIndex, int columnIndex) {

Set<Contribution> allContribs = ContributionListing.getAllContribs();

if (rowIndex >= allContribs.size()) {

return sectionHeaders[rowIndex - allContribs.size()];

}

return allContribs.stream().skip(rowIndex).findFirst().orElse(null);

}

public void enableSections(boolean enable) {

this.sectionsEnabled = enable;

}

// . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

static protected boolean matches(Contribution contrib, String typed) {

String search = ".*" + typed.toLowerCase() + ".*";

return (matchField(contrib.getName(), search) ||

matchField(contrib.getSentence(), search) ||

matchField(contrib.getAuthorList(), search) ||

matchField(contrib.getParagraph(), search));

}

static private boolean matchField(String field, String regex) {

return (field != null) && field.toLowerCase().matches(regex);

}

static class ContributionRowFilter extends RowFilter<ContributionTableModel, Integer> {

Contribution.Filter contributionFilter;

String categoryFilter;

List<String> stringFilters = Collections.emptyList();

ContributionRowFilter(Contribution.Filter contributionFilter) {

this.contributionFilter = contributionFilter;

}

public void setCategoryFilter(String categoryFilter) {

this.categoryFilter = categoryFilter;

}

public void setStringFilters(List<String> filters) {

this.stringFilters = filters;

}

@Override

public boolean include(Entry<? extends ContributionTableModel, ? extends Integer> entry) {

Contribution contribution = (Contribution) entry.getValue(0);

// if (contributionTab.getName().equals("updates")) {

// System.out.println(contributionTab.getName() + " checking " + contribution.getName() + " for inclusion " + includeContribution(contribution));

// }

if (contribution instanceof SectionHeaderContribution) {

return includeSection((SectionHeaderContribution) contribution);

}

return includeContribution(contribution);

}

private boolean includeContribution(Contribution contribution) {

return contributionFilter.matches(contribution) &&

Optional.ofNullable(categoryFilter).map(contribution::hasCategory).orElse(true) &&

stringFilters.stream().allMatch(pattern -> matches(contribution, pattern));

}

private boolean includeSection(SectionHeaderContribution section) {

return ContributionListing.getAllContribs().stream()

.filter(contribution -> contribution.getType() == section.getType())

.anyMatch(this::includeContribution);

}

// . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

/**

* Fake contribution that's just a section header for the updates panel.

static class SectionHeaderContribution extends Contribution {

ContributionType type;

SectionHeaderContribution(ContributionType type) {

this.type = type;

switch (type) {

case LIBRARY -> this.name = "Libraries";

case MODE -> this.name = "Modes";

case TOOL -> this.name = "Tools";

case EXAMPLES -> this.name = "Examples";

}

@Override

public ContributionType getType() {

return type;

}

@Override

public boolean isInstalled() {

return false;

}

// . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

// Thread: EDT

protected void contributionAdded(final Contribution contribution) {

if (filter.matches(contribution)) {

if (!detailForContrib.containsKey(contribution)) {

StatusDetail newPanel = contributionTab.createStatusDetail();

detailForContrib.put(contribution, newPanel);

newPanel.setContrib(contribution);

// model.fireTableDataChanged();

}

// Thread: EDT

protected void contributionRemoved(final Contribution contribution) {

if (filter.matches(contribution)) {

StatusDetail panel = detailForContrib.get(contribution);

if (panel != null) {

detailForContrib.remove(contribution);

}

// model.fireTableDataChanged();

}

// Thread: EDT

protected void contributionChanged(final Contribution oldContrib,

final Contribution newContrib) {

if (filter.matches(oldContrib)) {

StatusDetail detail = detailForContrib.get(oldContrib);

detailForContrib.remove(oldContrib);

detail.setContrib(newContrib);

detailForContrib.put(newContrib, detail);

// model.fireTableDataChanged();

}

// Thread: EDT

protected void updateFilter(String category, List<String> filters) {

rowFilter.setCategoryFilter(category);

rowFilter.setStringFilters(filters);

// model.fireTableDataChanged();

updateModel();

}

protected void updateModel() {

model.fireTableDataChanged();

}

// Thread: EDT

private void setSelectedDetail(StatusDetail contribDetail) {

contributionTab.applyDetail(contribDetail);

if (selectedDetail != contribDetail) {

selectedDetail = contribDetail;

requestFocusInWindow();

}

protected StatusDetail getSelectedDetail() {

return selectedDetail;

}

@Override

public Dimension getPreferredScrollableViewportSize() {

return getPreferredSize();

}

/**

* Amount to scroll to reveal a new page of items

@Override

public int getScrollableBlockIncrement(Rectangle visibleRect,

int orientation, int direction) {

if (orientation == SwingConstants.VERTICAL) {

int blockAmount = visibleRect.height;

if (direction > 0) {

visibleRect.y += blockAmount;

} else {

visibleRect.y -= blockAmount;

}

blockAmount +=

getScrollableUnitIncrement(visibleRect, orientation, direction);

return blockAmount;

}

return 0;

}

/**

* Amount to scroll to reveal the rest of something we are on or a new item

@Override

public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction) {

if (orientation != SwingConstants.VERTICAL) {

return 0;

}

int lastHeight = 0;

int height = 0;

int bottomOfScrollArea = visibleRect.y + visibleRect.height;

for (Component c : getComponents()) {

Dimension d = c.getPreferredSize();

int nextHeight = height + d.height;

if (direction > 0) {

// scrolling down

if (nextHeight > bottomOfScrollArea) {

return nextHeight - bottomOfScrollArea;

}

} else if (nextHeight > visibleRect.y) {

if (visibleRect.y != height) {

return visibleRect.y - height;

} else {

return visibleRect.y - lastHeight;

}

lastHeight = height;

height = nextHeight;

}

return 0;

}

@Override

public boolean getScrollableTracksViewportHeight() {

return false;

}

@Override

public boolean getScrollableTracksViewportWidth() {

return true;

}

processing4/app/src/processing/app/contrib/ListPanel.java at main · processing/processing4 · GitHub

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