+++ /dev/null
-/*
- * Jexer - Java Text User Interface
- *
- * The MIT License (MIT)
- *
- * Copyright (C) 2019 Kevin Lamonte
- *
- * 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.
- *
- * @author Kevin Lamonte [kevin.lamonte@gmail.com]
- * @version 1
- */
-package jexer.ttree;
-
-import jexer.TAction;
-import jexer.TKeypress;
-import jexer.TWidget;
-import jexer.event.TKeypressEvent;
-import static jexer.TKeypress.*;
-
-/**
- * TTreeView implements a simple tree view.
- */
-public class TTreeView extends TWidget {
-
- // ------------------------------------------------------------------------
- // Variables --------------------------------------------------------------
- // ------------------------------------------------------------------------
-
- /**
- * Root of the tree.
- */
- private TTreeItem treeRoot;
-
- /**
- * Only one of my children can be selected.
- */
- private TTreeItem selectedItem = null;
-
- /**
- * The action to perform when the user selects an item.
- */
- private TAction action = null;
-
- /**
- * The top line currently visible.
- */
- private int topLine = 0;
-
- /**
- * The left column currently visible.
- */
- private int leftColumn = 0;
-
- // ------------------------------------------------------------------------
- // Constructors -----------------------------------------------------------
- // ------------------------------------------------------------------------
-
- /**
- * Public constructor.
- *
- * @param parent parent widget
- * @param x column relative to parent
- * @param y row relative to parent
- * @param width width of tree view
- * @param height height of tree view
- */
- public TTreeView(final TWidget parent, final int x, final int y,
- final int width, final int height) {
-
- this(parent, x, y, width, height, null);
- }
-
- /**
- * Public constructor.
- *
- * @param parent parent widget
- * @param x column relative to parent
- * @param y row relative to parent
- * @param width width of tree view
- * @param height height of tree view
- * @param action action to perform when an item is selected
- */
- public TTreeView(final TWidget parent, final int x, final int y,
- final int width, final int height, final TAction action) {
-
- super(parent, x, y, width, height);
- this.action = action;
- }
-
- // ------------------------------------------------------------------------
- // Event handlers ---------------------------------------------------------
- // ------------------------------------------------------------------------
-
- /**
- * Handle keystrokes.
- *
- * @param keypress keystroke event
- */
- @Override
- public void onKeypress(final TKeypressEvent keypress) {
- if (keypress.equals(kbUp)) {
- // Select the previous item
- if (selectedItem != null) {
- if (selectedItem.keyboardPrevious != null) {
- setSelected(selectedItem.keyboardPrevious, true);
- }
- }
- } else if (keypress.equals(kbDown)) {
- // Select the next item
- if (selectedItem != null) {
- if (selectedItem.keyboardNext != null) {
- setSelected(selectedItem.keyboardNext, true);
- }
- }
- } else if (keypress.equals(kbPgDn)) {
- for (int i = 0; i < getHeight() - 1; i++) {
- onKeypress(new TKeypressEvent(TKeypress.kbDown));
- }
- } else if (keypress.equals(kbPgUp)) {
- for (int i = 0; i < getHeight() - 1; i++) {
- onKeypress(new TKeypressEvent(TKeypress.kbUp));
- }
- } else if (keypress.equals(kbHome)) {
- setSelected((TTreeItem) getChildren().get(0), false);
- setTopLine(0);
- } else if (keypress.equals(kbEnd)) {
- setSelected((TTreeItem) getChildren().get(getChildren().size() - 1),
- true);
- } else {
- if (selectedItem != null) {
- selectedItem.onKeypress(keypress);
- } else {
- // Pass other keys (tab etc.) on to TWidget's handler.
- super.onKeypress(keypress);
- }
- }
- }
-
- // ------------------------------------------------------------------------
- // TWidget ----------------------------------------------------------------
- // ------------------------------------------------------------------------
-
-
- // ------------------------------------------------------------------------
- // TTreeView --------------------------------------------------------------
- // ------------------------------------------------------------------------
-
- /**
- * Get the root of the tree.
- *
- * @return the root of the tree
- */
- public final TTreeItem getTreeRoot() {
- return treeRoot;
- }
-
- /**
- * Set the root of the tree.
- *
- * @param treeRoot the new root of the tree
- */
- public final void setTreeRoot(final TTreeItem treeRoot) {
- this.treeRoot = treeRoot;
- alignTree();
- }
-
- /**
- * Get the tree view item that was selected.
- *
- * @return the selected item, or null if no item is selected
- */
- public final TTreeItem getSelected() {
- return selectedItem;
- }
-
- /**
- * Set the new selected tree view item.
- *
- * @param item new item that became selected
- * @param centerWindow if true, move the window to put the selected into
- * view
- */
- public void setSelected(final TTreeItem item, final boolean centerWindow) {
- if (item != null) {
- item.setSelected(true);
- }
- if ((selectedItem != null) && (selectedItem != item)) {
- selectedItem.setSelected(false);
- }
- selectedItem = item;
-
- if (centerWindow) {
- int y = 0;
- for (TWidget widget: getChildren()) {
- if (widget == selectedItem) {
- break;
- }
- y++;
- }
- topLine = y - (getHeight() - 1)/2;
- if (topLine > getChildren().size() - getHeight()) {
- topLine = getChildren().size() - getHeight();
- }
- if (topLine < 0) {
- topLine = 0;
- }
- }
-
- if (selectedItem != null) {
- activate(selectedItem);
- }
- }
-
- /**
- * Perform user selection action.
- */
- public void dispatch() {
- if (action != null) {
- action.DO(this);
- }
- }
-
- /**
- * Get the left column value. 0 is the leftmost column.
- *
- * @return the left column
- */
- public int getLeftColumn() {
- return leftColumn;
- }
-
- /**
- * Set the left column value. 0 is the leftmost column.
- *
- * @param leftColumn the new left column
- */
- public void setLeftColumn(final int leftColumn) {
- this.leftColumn = leftColumn;
- }
-
- /**
- * Get the top line (row) value. 0 is the topmost line.
- *
- * @return the top line
- */
- public int getTopLine() {
- return topLine;
- }
-
- /**
- * Set the top line value. 0 is the topmost line.
- *
- * @param topLine the new top line
- */
- public void setTopLine(final int topLine) {
- this.topLine = topLine;
- }
-
- /**
- * Get the total line (rows) count, based on the items that are visible
- * and expanded.
- *
- * @return the line count
- */
- public int getTotalLineCount() {
- if (treeRoot == null) {
- return 0;
- }
- return getChildren().size();
- }
-
- /**
- * Get the length of the widest item to display.
- *
- * @return the maximum number of columns for this item or its children
- */
- public int getMaximumColumn() {
- if (treeRoot == null) {
- return 0;
- }
- return treeRoot.getMaximumColumn();
- }
-
- /**
- * Update the Y positions of all the children items to match the current
- * topLine value. Note package private access.
- */
- void alignTree() {
- if (treeRoot == null) {
- return;
- }
-
- // As we walk the list we also adjust next/previous pointers,
- // resulting in a doubly-linked list but only of the expanded items.
- TTreeItem p = null;
-
- for (int i = 0; i < getChildren().size(); i++) {
- TTreeItem item = (TTreeItem) getChildren().get(i);
-
- if (p != null) {
- item.keyboardPrevious = p;
- p.keyboardNext = item;
- }
- p = item;
-
- item.setY(i - topLine);
- item.setWidth(getWidth());
- }
-
- }
-
-}
git://git.nikiroo.be / fanfix.git / blobdiff