*
* The MIT License (MIT)
*
- * Copyright (C) 2017 Kevin Lamonte
+ * 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"),
*/
package jexer;
+import java.io.IOException;
+
import jexer.bits.CellAttributes;
import jexer.event.TKeypressEvent;
import jexer.event.TMouseEvent;
* TEditorWidget displays an editable text document. It is unaware of
* scrolling behavior, but can respond to mouse and keyboard events.
*/
-public final class TEditorWidget extends TWidget {
+public class TEditorWidget extends TWidget {
+
+ // ------------------------------------------------------------------------
+ // Constants --------------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * The number of lines to scroll on mouse wheel up/down.
+ */
+ private static final int wheelScrollSize = 3;
+
+ // ------------------------------------------------------------------------
+ // Variables --------------------------------------------------------------
+ // ------------------------------------------------------------------------
/**
* The document being edited.
*/
private int leftColumn = 0;
+ // ------------------------------------------------------------------------
+ // Constructors -----------------------------------------------------------
+ // ------------------------------------------------------------------------
+
/**
* Public constructor.
*
document = new Document(text, defaultColor);
}
+ // ------------------------------------------------------------------------
+ // TWidget ----------------------------------------------------------------
+ // ------------------------------------------------------------------------
+
/**
* Draw the text box.
*/
}
}
}
-
}
/**
@Override
public void onMouseDown(final TMouseEvent mouse) {
if (mouse.isMouseWheelUp()) {
- if (getCursorY() == getHeight() - 1) {
- if (document.up()) {
- if (topLine > 0) {
- topLine--;
- }
- alignCursor();
- }
- } else {
+ for (int i = 0; i < wheelScrollSize; i++) {
if (topLine > 0) {
topLine--;
- setCursorY(getCursorY() + 1);
+ alignDocument(false);
}
}
return;
}
if (mouse.isMouseWheelDown()) {
- if (getCursorY() == 0) {
- if (document.down()) {
- if (topLine < document.getLineNumber()) {
- topLine++;
- }
- alignCursor();
- }
- } else {
- if (topLine < document.getLineCount() - getHeight()) {
+ for (int i = 0; i < wheelScrollSize; i++) {
+ if (topLine < document.getLineCount() - 1) {
topLine++;
- setCursorY(getCursorY() - 1);
+ alignDocument(true);
}
}
return;
// Set the row and column
int newLine = topLine + mouse.getY();
int newX = leftColumn + mouse.getX();
- if (newLine > document.getLineCount()) {
+ if (newLine > document.getLineCount() - 1) {
// Go to the end
document.setLineNumber(document.getLineCount() - 1);
document.end();
- if (document.getLineCount() > getHeight()) {
- setCursorY(getHeight() - 1);
+ if (newLine > document.getLineCount() - 1) {
+ setCursorY(document.getLineCount() - 1 - topLine);
} else {
- setCursorY(document.getLineCount() - 1);
+ setCursorY(mouse.getY());
}
alignCursor();
return;
document.setLineNumber(newLine);
setCursorY(mouse.getY());
- if (newX > document.getCurrentLine().getDisplayLength()) {
+ if (newX >= document.getCurrentLine().getDisplayLength()) {
document.end();
alignCursor();
} else {
+ document.setCursor(newX);
setCursorX(mouse.getX());
}
return;
super.onMouseDown(mouse);
}
- /**
- * Align visible cursor with document cursor.
- */
- private void alignCursor() {
- int width = getWidth();
-
- int desiredX = document.getCursor() - leftColumn;
- if (desiredX < 0) {
- // We need to push the screen to the left.
- leftColumn = document.getCursor();
- } else if (desiredX > width - 1) {
- // We need to push the screen to the right.
- leftColumn = document.getCursor() - (width - 1);
- }
-
- /*
- System.err.println("document cursor " + document.getCursor() +
- " leftColumn " + leftColumn);
- */
-
- setCursorX(document.getCursor() - leftColumn);
- }
-
/**
* Handle keystrokes.
*
@Override
public void onKeypress(final TKeypressEvent keypress) {
if (keypress.equals(kbLeft)) {
- if (document.left()) {
- alignCursor();
- }
+ document.left();
+ alignTopLine(false);
} else if (keypress.equals(kbRight)) {
- if (document.right()) {
- alignCursor();
- }
+ document.right();
+ alignTopLine(true);
+ } else if (keypress.equals(kbAltLeft)
+ || keypress.equals(kbCtrlLeft)
+ ) {
+ document.backwardsWord();
+ alignTopLine(false);
+ } else if (keypress.equals(kbAltRight)
+ || keypress.equals(kbCtrlRight)
+ ) {
+ document.forwardsWord();
+ alignTopLine(true);
} else if (keypress.equals(kbUp)) {
- if (document.up()) {
- if (getCursorY() > 0) {
- setCursorY(getCursorY() - 1);
- } else {
- if (topLine > 0) {
- topLine--;
- }
- }
- alignCursor();
- }
+ document.up();
+ alignTopLine(false);
} else if (keypress.equals(kbDown)) {
- if (document.down()) {
- if (getCursorY() < getHeight() - 1) {
- setCursorY(getCursorY() + 1);
- } else {
- if (topLine < document.getLineCount() - getHeight()) {
- topLine++;
- }
- }
- alignCursor();
- }
+ document.down();
+ alignTopLine(true);
} else if (keypress.equals(kbPgUp)) {
- for (int i = 0; i < getHeight() - 1; i++) {
- if (document.up()) {
- if (getCursorY() > 0) {
- setCursorY(getCursorY() - 1);
- } else {
- if (topLine > 0) {
- topLine--;
- }
- }
- alignCursor();
- } else {
- break;
- }
- }
+ document.up(getHeight() - 1);
+ alignTopLine(false);
} else if (keypress.equals(kbPgDn)) {
- for (int i = 0; i < getHeight() - 1; i++) {
- if (document.down()) {
- if (getCursorY() < getHeight() - 1) {
- setCursorY(getCursorY() + 1);
- } else {
- if (topLine < document.getLineCount() - getHeight()) {
- topLine++;
- }
- }
- alignCursor();
- } else {
- break;
- }
- }
+ document.down(getHeight() - 1);
+ alignTopLine(true);
} else if (keypress.equals(kbHome)) {
if (document.home()) {
leftColumn = 0;
} else if (keypress.equals(kbCtrlEnd)) {
document.setLineNumber(document.getLineCount() - 1);
document.end();
- topLine = document.getLineCount() - getHeight();
- if (topLine < 0) {
- topLine = 0;
- }
- if (document.getLineCount() > getHeight()) {
- setCursorY(getHeight() - 1);
- } else {
- setCursorY(document.getLineCount() - 1);
- }
- alignCursor();
+ alignTopLine(false);
} else if (keypress.equals(kbIns)) {
document.setOverwrite(!document.getOverwrite());
} else if (keypress.equals(kbDel)) {
document.del();
- } else if (keypress.equals(kbBackspace)) {
+ alignCursor();
+ } else if (keypress.equals(kbBackspace)
+ || keypress.equals(kbBackspaceDel)
+ ) {
document.backspace();
+ alignTopLine(false);
+ } else if (keypress.equals(kbTab)) {
+ // TODO: tab character. For now just add spaces until we hit
+ // modulo 8.
+ for (int i = document.getCursor(); (i + 1) % 8 != 0; i++) {
+ document.addChar(' ');
+ }
alignCursor();
+ } else if (keypress.equals(kbEnter)) {
+ document.enter();
+ alignTopLine(true);
} else if (!keypress.getKey().isFnKey()
&& !keypress.getKey().isAlt()
&& !keypress.getKey().isCtrl()
) {
// Plain old keystroke, process it
document.addChar(keypress.getKey().getChar());
+ alignCursor();
} else {
// Pass other keys (tab etc.) on to TWidget
super.onKeypress(keypress);
}
}
+ // ------------------------------------------------------------------------
+ // TEditorWidget ----------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * Align visible area with document current line.
+ *
+ * @param topLineIsTop if true, make the top visible line the document
+ * current line if it was off-screen. If false, make the bottom visible
+ * line the document current line.
+ */
+ private void alignTopLine(final boolean topLineIsTop) {
+ int line = document.getLineNumber();
+
+ if ((line < topLine) || (line > topLine + getHeight() - 1)) {
+ // Need to move topLine to bring document back into view.
+ if (topLineIsTop) {
+ topLine = line - (getHeight() - 1);
+ if (topLine < 0) {
+ topLine = 0;
+ }
+ assert (topLine >= 0);
+ } else {
+ topLine = line;
+ assert (topLine >= 0);
+ }
+ }
+
+ /*
+ System.err.println("line " + line + " topLine " + topLine);
+ */
+
+ // Document is in view, let's set cursorY
+ assert (line >= topLine);
+ setCursorY(line - topLine);
+ alignCursor();
+ }
+
+ /**
+ * Align document current line with visible area.
+ *
+ * @param topLineIsTop if true, make the top visible line the document
+ * current line if it was off-screen. If false, make the bottom visible
+ * line the document current line.
+ */
+ private void alignDocument(final boolean topLineIsTop) {
+ int line = document.getLineNumber();
+ int cursor = document.getCursor();
+
+ if ((line < topLine) || (line > topLine + getHeight() - 1)) {
+ // Need to move document to ensure it fits view.
+ if (topLineIsTop) {
+ document.setLineNumber(topLine);
+ } else {
+ document.setLineNumber(topLine + (getHeight() - 1));
+ }
+ if (cursor < document.getCurrentLine().getDisplayLength()) {
+ document.setCursor(cursor);
+ }
+ }
+
+ /*
+ System.err.println("getLineNumber() " + document.getLineNumber() +
+ " topLine " + topLine);
+ */
+
+ // Document is in view, let's set cursorY
+ setCursorY(document.getLineNumber() - topLine);
+ alignCursor();
+ }
+
+ /**
+ * Align visible cursor with document cursor.
+ */
+ private void alignCursor() {
+ int width = getWidth();
+
+ int desiredX = document.getCursor() - leftColumn;
+ if (desiredX < 0) {
+ // We need to push the screen to the left.
+ leftColumn = document.getCursor();
+ } else if (desiredX > width - 1) {
+ // We need to push the screen to the right.
+ leftColumn = document.getCursor() - (width - 1);
+ }
+
+ /*
+ System.err.println("document cursor " + document.getCursor() +
+ " leftColumn " + leftColumn);
+ */
+
+
+ setCursorX(document.getCursor() - leftColumn);
+ }
+
+ /**
+ * Get the number of lines in the underlying Document.
+ *
+ * @return the number of lines
+ */
+ public int getLineCount() {
+ return document.getLineCount();
+ }
+
+ /**
+ * Get the current visible top row number. 1-based.
+ *
+ * @return the visible top row number. Row 1 is the first row.
+ */
+ public int getVisibleRowNumber() {
+ return topLine + 1;
+ }
+
+ /**
+ * Set the current visible row number. 1-based.
+ *
+ * @param row the new visible row number. Row 1 is the first row.
+ */
+ public void setVisibleRowNumber(final int row) {
+ assert (row > 0);
+ if ((row > 0) && (row < document.getLineCount())) {
+ topLine = row - 1;
+ alignDocument(true);
+ }
+ }
+
+ /**
+ * Get the current editing row number. 1-based.
+ *
+ * @return the editing row number. Row 1 is the first row.
+ */
+ public int getEditingRowNumber() {
+ return document.getLineNumber() + 1;
+ }
+
+ /**
+ * Set the current editing row number. 1-based.
+ *
+ * @param row the new editing row number. Row 1 is the first row.
+ */
+ public void setEditingRowNumber(final int row) {
+ assert (row > 0);
+ if ((row > 0) && (row < document.getLineCount())) {
+ document.setLineNumber(row - 1);
+ alignTopLine(true);
+ }
+ }
+
+ /**
+ * Set the current visible column number. 1-based.
+ *
+ * @return the visible column number. Column 1 is the first column.
+ */
+ public int getVisibleColumnNumber() {
+ return leftColumn + 1;
+ }
+
+ /**
+ * Set the current visible column number. 1-based.
+ *
+ * @param column the new visible column number. Column 1 is the first
+ * column.
+ */
+ public void setVisibleColumnNumber(final int column) {
+ assert (column > 0);
+ if ((column > 0) && (column < document.getLineLengthMax())) {
+ leftColumn = column - 1;
+ alignDocument(true);
+ }
+ }
+
+ /**
+ * Get the current editing column number. 1-based.
+ *
+ * @return the editing column number. Column 1 is the first column.
+ */
+ public int getEditingColumnNumber() {
+ return document.getCursor() + 1;
+ }
+
+ /**
+ * Set the current editing column number. 1-based.
+ *
+ * @param column the new editing column number. Column 1 is the first
+ * column.
+ */
+ public void setEditingColumnNumber(final int column) {
+ if ((column > 0) && (column < document.getLineLength())) {
+ document.setCursor(column - 1);
+ alignCursor();
+ }
+ }
+
+ /**
+ * Get the maximum possible row number. 1-based.
+ *
+ * @return the maximum row number. Row 1 is the first row.
+ */
+ public int getMaximumRowNumber() {
+ return document.getLineCount() + 1;
+ }
+
+ /**
+ * Get the maximum possible column number. 1-based.
+ *
+ * @return the maximum column number. Column 1 is the first column.
+ */
+ public int getMaximumColumnNumber() {
+ return document.getLineLengthMax() + 1;
+ }
+
+ /**
+ * Get the dirty value.
+ *
+ * @return true if the buffer is dirty
+ */
+ public boolean isDirty() {
+ return document.isDirty();
+ }
+
+ /**
+ * Save contents to file.
+ *
+ * @param filename file to save to
+ * @throws IOException if a java.io operation throws
+ */
+ public void saveToFilename(final String filename) throws IOException {
+ document.saveToFilename(filename);
+ }
+
}
git://git.nikiroo.be / nikiroo-utils.git / blobdiff