--- /dev/null
+/*
+ * Jexer - Java Text User Interface
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (C) 2017 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 java.util.ArrayList;
+import java.util.List;
+
+import jexer.TWidget;
+import jexer.bits.CellAttributes;
+import jexer.bits.GraphicsChars;
+import jexer.event.TKeypressEvent;
+import jexer.event.TMouseEvent;
+import static jexer.TKeypress.*;
+
+/**
+ * TTreeItem is a single item in a tree view.
+ */
+public class TTreeItem extends TWidget {
+
+ // ------------------------------------------------------------------------
+ // Variables --------------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * Hang onto reference to my parent TTreeView so I can call its reflow()
+ * when I add a child node.
+ */
+ private TTreeView view;
+
+ /**
+ * Displayable text for this item.
+ */
+ private String text;
+
+ /**
+ * If true, this item is expanded in the tree view.
+ */
+ private boolean expanded = true;
+
+ /**
+ * If true, this item can be expanded in the tree view.
+ */
+ private boolean expandable = false;
+
+ /**
+ * The vertical bars and such along the left side.
+ */
+ private String prefix = "";
+
+ /**
+ * Tree level.
+ */
+ protected int level = 0;
+
+ /**
+ * True means selected.
+ */
+ private boolean selected = false;
+
+ /**
+ * True means select-able.
+ */
+ private boolean selectable = true;
+
+ /**
+ * Whether or not this item is last in its parent's list of children.
+ */
+ private boolean last = false;
+
+ /**
+ * Pointer to the previous keyboard-navigable item (kbUp). Note package
+ * private access.
+ */
+ TTreeItem keyboardPrevious = null;
+
+ /**
+ * Pointer to the next keyboard-navigable item (kbDown). Note package
+ * private access.
+ */
+ TTreeItem keyboardNext = null;
+
+ // ------------------------------------------------------------------------
+ // Constructors -----------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * Public constructor.
+ *
+ * @param view root TTreeView
+ * @param text text for this item
+ * @param expanded if true, have it expanded immediately
+ */
+ public TTreeItem(final TTreeView view, final String text,
+ final boolean expanded) {
+
+ super(view, 0, 0, view.getWidth() - 3, 1);
+
+ this.text = text;
+ this.expanded = expanded;
+ this.view = view;
+
+ if (view.getTreeRoot() == null) {
+ view.setTreeRoot(this);
+ } else {
+ view.alignTree();
+ }
+ }
+
+ // ------------------------------------------------------------------------
+ // Event handlers ---------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * Handle mouse release events.
+ *
+ * @param mouse mouse button release event
+ */
+ @Override
+ public void onMouseUp(final TMouseEvent mouse) {
+ if ((mouse.getX() == (getExpanderX() - view.getLeftColumn()))
+ && (mouse.getY() == 0)
+ ) {
+ if (level == 0) {
+ // Root node can't switch.
+ return;
+ }
+ if (selectable) {
+ // Flip expanded flag
+ expanded = !expanded;
+ if (expanded == false) {
+ // Unselect children that became invisible
+ unselect();
+ }
+ view.setSelected(this, false);
+ }
+ // Let subclasses do something with this
+ onExpand();
+
+ // Update the screen after any thing has expanded/contracted
+ view.alignTree();
+ } else if (mouse.getY() == 0) {
+ // Do the action associated with this item.
+ view.setSelected(this, false);
+ view.dispatch();
+ }
+ }
+
+ /**
+ * Called when this item is expanded or collapsed. this.expanded will be
+ * true if this item was just expanded from a mouse click or keypress.
+ */
+ public void onExpand() {
+ // Default: do nothing.
+ if (!expandable) {
+ return;
+ }
+ }
+
+ /**
+ * Handle keystrokes.
+ *
+ * @param keypress keystroke event
+ */
+ @Override
+ public void onKeypress(final TKeypressEvent keypress) {
+ if (keypress.equals(kbLeft)
+ || keypress.equals(kbRight)
+ || keypress.equals(kbSpace)
+ ) {
+ if (level == 0) {
+ // Root node can't switch.
+ return;
+ }
+ if (selectable) {
+ // Flip expanded flag
+ expanded = !expanded;
+ if (expanded == false) {
+ // Unselect children that became invisible
+ unselect();
+ }
+ view.setSelected(this, false);
+ }
+ // Let subclasses do something with this
+ onExpand();
+ } else if (keypress.equals(kbEnter)) {
+ // Do the action associated with this item.
+ view.dispatch();
+ } else {
+ // Pass other keys (tab etc.) on to TWidget's handler.
+ super.onKeypress(keypress);
+ }
+ }
+
+ // ------------------------------------------------------------------------
+ // TWidget ----------------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * Draw this item to a window.
+ */
+ @Override
+ public void draw() {
+ if ((getY() < 0) || (getY() > getParent().getHeight() - 1)) {
+ return;
+ }
+
+ int offset = -view.getLeftColumn();
+
+ CellAttributes color = getTheme().getColor("ttreeview");
+ CellAttributes textColor = getTheme().getColor("ttreeview");
+ CellAttributes expanderColor = getTheme().getColor("ttreeview.expandbutton");
+ CellAttributes selectedColor = getTheme().getColor("ttreeview.selected");
+
+ if (!getParent().isAbsoluteActive()) {
+ color = getTheme().getColor("ttreeview.inactive");
+ textColor = getTheme().getColor("ttreeview.inactive");
+ selectedColor = getTheme().getColor("ttreeview.selected.inactive");
+ }
+
+ if (!selectable) {
+ textColor = getTheme().getColor("ttreeview.unreadable");
+ }
+
+ // Blank out the background
+ getScreen().hLineXY(0, 0, getWidth(), ' ', color);
+
+ String line = prefix;
+ if (level > 0) {
+ if (last) {
+ line += GraphicsChars.CP437[0xC0];
+ } else {
+ line += GraphicsChars.CP437[0xC3];
+ }
+ line += GraphicsChars.CP437[0xC4];
+ if (expandable) {
+ line += "[ ] ";
+ } else {
+ line += " ";
+ }
+ }
+ getScreen().putStringXY(offset, 0, line, color);
+ if (selected) {
+ getScreen().putStringXY(offset + line.length(), 0, text,
+ selectedColor);
+ } else {
+ getScreen().putStringXY(offset + line.length(), 0, text, textColor);
+ }
+ if ((level > 0) && (expandable)) {
+ if (expanded) {
+ getScreen().putCharXY(offset + getExpanderX(), 0, '-',
+ expanderColor);
+ } else {
+ getScreen().putCharXY(offset + getExpanderX(), 0, '+',
+ expanderColor);
+ }
+ }
+ }
+
+ // ------------------------------------------------------------------------
+ // TTreeItem --------------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * Get the parent TTreeView.
+ *
+ * @return the parent TTreeView
+ */
+ public final TTreeView getTreeView() {
+ return view;
+ }
+
+ /**
+ * Get the displayable text for this item.
+ *
+ * @return the displayable text for this item
+ */
+ public final String getText() {
+ return text;
+ }
+
+ /**
+ * Set the displayable text for this item.
+ *
+ * @param text the displayable text for this item
+ */
+ public final void setText(final String text) {
+ this.text = text;
+ }
+
+ /**
+ * Get expanded value.
+ *
+ * @return if true, this item is expanded
+ */
+ public final boolean isExpanded() {
+ return expanded;
+ }
+
+ /**
+ * Set expanded value.
+ *
+ * @param expanded new value
+ */
+ public final void setExpanded(final boolean expanded) {
+ if (level == 0) {
+ // Root node can't be unexpanded, ever.
+ this.expanded = true;
+ return;
+ }
+ if (level > 0) {
+ this.expanded = expanded;
+ }
+ }
+
+ /**
+ * Get expandable value.
+ *
+ * @return if true, this item is expandable
+ */
+ public final boolean isExpandable() {
+ return expandable;
+ }
+
+ /**
+ * Set expandable value.
+ *
+ * @param expandable new value
+ */
+ public final void setExpandable(final boolean expandable) {
+ if (level == 0) {
+ // Root node can't be unexpanded, ever.
+ this.expandable = true;
+ return;
+ }
+ if (level > 0) {
+ this.expandable = expandable;
+ }
+ }
+
+ /**
+ * Get the vertical bars and such along the left side.
+ *
+ * @return the vertical bars and such along the left side
+ */
+ public final String getPrefix() {
+ return prefix;
+ }
+
+ /**
+ * Get selected value.
+ *
+ * @return if true, this item is selected
+ */
+ public final boolean isSelected() {
+ return selected;
+ }
+
+ /**
+ * Set selected value.
+ *
+ * @param selected new value
+ */
+ public final void setSelected(final boolean selected) {
+ this.selected = selected;
+ }
+
+ /**
+ * Set selectable value.
+ *
+ * @param selectable new value
+ */
+ public final void setSelectable(final boolean selectable) {
+ this.selectable = selectable;
+ }
+
+ /**
+ * Get the length of the widest item to display.
+ *
+ * @return the maximum number of columns for this item or its children
+ */
+ public int getMaximumColumn() {
+ int max = prefix.length() + 4 + text.length();
+ for (TWidget widget: getChildren()) {
+ TTreeItem item = (TTreeItem) widget;
+ int n = item.prefix.length() + 4 + item.text.length();
+ if (n > max) {
+ max = n;
+ }
+ }
+ return max;
+ }
+
+ /**
+ * Recursively expand the tree into a linear array of items.
+ *
+ * @param prefix vertical bar of parent levels and such that is set on
+ * each child
+ * @param last if true, this is the "last" leaf node of a tree
+ * @return additional items to add to the array
+ */
+ public List<TTreeItem> expandTree(final String prefix, final boolean last) {
+ List<TTreeItem> array = new ArrayList<TTreeItem>();
+ this.last = last;
+ this.prefix = prefix;
+ array.add(this);
+
+ if ((getChildren().size() == 0) || !expanded) {
+ return array;
+ }
+
+ String newPrefix = prefix;
+ if (level > 0) {
+ if (last) {
+ newPrefix += " ";
+ } else {
+ newPrefix += GraphicsChars.CP437[0xB3];
+ newPrefix += ' ';
+ }
+ }
+ for (int i = 0; i < getChildren().size(); i++) {
+ TTreeItem item = (TTreeItem) getChildren().get(i);
+ if (i == getChildren().size() - 1) {
+ array.addAll(item.expandTree(newPrefix, true));
+ } else {
+ array.addAll(item.expandTree(newPrefix, false));
+ }
+ }
+ return array;
+ }
+
+ /**
+ * Get the x spot for the + or - to expand/collapse.
+ *
+ * @return column of the expand/collapse button
+ */
+ private int getExpanderX() {
+ if ((level == 0) || (!expandable)) {
+ return 0;
+ }
+ return prefix.length() + 3;
+ }
+
+ /**
+ * Recursively unselect me and my children.
+ */
+ public void unselect() {
+ if (selected == true) {
+ selected = false;
+ view.setSelected(null, false);
+ }
+ for (TWidget widget: getChildren()) {
+ if (widget instanceof TTreeItem) {
+ TTreeItem item = (TTreeItem) widget;
+ item.unselect();
+ }
+ }
+ }
+
+}
git://git.nikiroo.be / fanfix.git / blobdiff