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feat(renderer): enhance CustomMultiLineTextArea with selection and clipboard support

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extio-de
2026-01-25 19:18:11 +01:00
parent b570276e1b
commit d46e1468ec
1 changed files with 238 additions and 14 deletions
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252
src/main/java/de/extio/game_engine/renderer/g2d/control/components/CustomMultiLineTextArea.java
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@@ -4,6 +4,10 @@ import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.KeyEvent;
@@ -37,6 +41,8 @@ public class CustomMultiLineTextArea extends Component {
private int caretPosition = 0;
private int selectionAnchor = 0;
private int scrollOffsetY = 0;
private int fontSize;
@@ -78,6 +84,7 @@ public class CustomMultiLineTextArea extends Component {
public void setText(final String text) {
this.text = text == null ? "" : text;
this.caretPosition = Math.min(this.caretPosition, this.text.length());
this.selectionAnchor = this.caretPosition;
this.dirty = true;
}
@@ -142,9 +149,11 @@ public class CustomMultiLineTextArea extends Component {
final char ch = e.getKeyChar();
if (!Character.isISOControl(ch)) {
deleteSelection();
insertChar(ch);
}
else if (ch == '\n' || ch == '\r') {
deleteSelection();
insertChar('\n');
}
else if (ch == '\b') {
@@ -158,10 +167,16 @@ public class CustomMultiLineTextArea extends Component {
return;
}
final boolean shiftPressed = e.isShiftDown();
final boolean ctrlPressed = e.isControlDown();
switch (e.getKeyCode()) {
case KeyEvent.VK_LEFT:
if (CustomMultiLineTextArea.this.caretPosition > 0) {
CustomMultiLineTextArea.this.caretPosition--;
if (!shiftPressed) {
CustomMultiLineTextArea.this.selectionAnchor = CustomMultiLineTextArea.this.caretPosition;
}
ensureCaretVisible();
CustomMultiLineTextArea.this.dirty = true;
}
@@ -169,28 +184,87 @@ public class CustomMultiLineTextArea extends Component {
case KeyEvent.VK_RIGHT:
if (CustomMultiLineTextArea.this.caretPosition < CustomMultiLineTextArea.this.text.length()) {
CustomMultiLineTextArea.this.caretPosition++;
if (!shiftPressed) {
CustomMultiLineTextArea.this.selectionAnchor = CustomMultiLineTextArea.this.caretPosition;
}
ensureCaretVisible();
CustomMultiLineTextArea.this.dirty = true;
}
break;
case KeyEvent.VK_UP:
moveCaretUp();
if (!shiftPressed) {
CustomMultiLineTextArea.this.selectionAnchor = CustomMultiLineTextArea.this.caretPosition;
}
break;
case KeyEvent.VK_DOWN:
moveCaretDown();
if (!shiftPressed) {
CustomMultiLineTextArea.this.selectionAnchor = CustomMultiLineTextArea.this.caretPosition;
}
break;
case KeyEvent.VK_HOME:
moveCaretToLineStart();
if (!shiftPressed) {
CustomMultiLineTextArea.this.selectionAnchor = CustomMultiLineTextArea.this.caretPosition;
}
break;
case KeyEvent.VK_END:
moveCaretToLineEnd();
if (!shiftPressed) {
CustomMultiLineTextArea.this.selectionAnchor = CustomMultiLineTextArea.this.caretPosition;
}
break;
case KeyEvent.VK_DELETE:
if (!CustomMultiLineTextArea.this.readonly && CustomMultiLineTextArea.this.caretPosition < CustomMultiLineTextArea.this.text.length()) {
CustomMultiLineTextArea.this.text = CustomMultiLineTextArea.this.text.substring(0, CustomMultiLineTextArea.this.caretPosition) +
CustomMultiLineTextArea.this.text.substring(CustomMultiLineTextArea.this.caretPosition + 1);
notifyTextChanged();
CustomMultiLineTextArea.this.dirty = true;
if (!CustomMultiLineTextArea.this.readonly) {
if (hasSelection()) {
if (e.isShiftDown()) {
cut();
}
else {
deleteSelection();
}
}
else if (CustomMultiLineTextArea.this.caretPosition < CustomMultiLineTextArea.this.text.length()) {
CustomMultiLineTextArea.this.text = CustomMultiLineTextArea.this.text.substring(0, CustomMultiLineTextArea.this.caretPosition) +
CustomMultiLineTextArea.this.text.substring(CustomMultiLineTextArea.this.caretPosition + 1);
notifyTextChanged();
CustomMultiLineTextArea.this.dirty = true;
}
}
break;
case KeyEvent.VK_C:
if (ctrlPressed) {
copy();
e.consume();
}
break;
case KeyEvent.VK_X:
if (ctrlPressed && !CustomMultiLineTextArea.this.readonly) {
cut();
e.consume();
}
break;
case KeyEvent.VK_V:
if (ctrlPressed && !CustomMultiLineTextArea.this.readonly) {
paste();
e.consume();
}
break;
case KeyEvent.VK_INSERT:
if (ctrlPressed) {
copy();
e.consume();
}
else if (shiftPressed && !CustomMultiLineTextArea.this.readonly) {
paste();
e.consume();
}
break;
case KeyEvent.VK_A:
if (ctrlPressed) {
selectAll();
e.consume();
}
break;
}
@@ -215,6 +289,9 @@ public class CustomMultiLineTextArea extends Component {
}
else {
updateCaretPosition(e.getX(), e.getY());
if (!e.isShiftDown()) {
CustomMultiLineTextArea.this.selectionAnchor = CustomMultiLineTextArea.this.caretPosition;
}
}
e.consume();
}
@@ -238,6 +315,10 @@ public class CustomMultiLineTextArea extends Component {
handleScrollbarDrag(e.getY());
e.consume();
}
else if (!isInScrollbarArea(e.getX(), e.getY())) {
updateCaretPosition(e.getX(), e.getY());
e.consume();
}
}
});
@@ -272,15 +353,20 @@ public class CustomMultiLineTextArea extends Component {
private void insertChar(final char ch) {
this.text = this.text.substring(0, this.caretPosition) + ch + this.text.substring(this.caretPosition);
this.caretPosition++;
this.selectionAnchor = this.caretPosition;
ensureCaretVisible();
notifyTextChanged();
this.dirty = true;
}
private void backspace() {
if (this.caretPosition > 0) {
if (hasSelection()) {
deleteSelection();
}
else if (this.caretPosition > 0) {
this.text = this.text.substring(0, this.caretPosition - 1) + this.text.substring(this.caretPosition);
this.caretPosition--;
this.selectionAnchor = this.caretPosition;
ensureCaretVisible();
notifyTextChanged();
this.dirty = true;
@@ -442,7 +528,12 @@ public class CustomMultiLineTextArea extends Component {
final List<String> wrappedLines = getWrappedLines();
final List<String> rawLines = getLines();
final int lineHeight = getLineHeight();
final int clickedWrappedLine = Math.max(0, Math.min(wrappedLines.size() - 1, (mouseY + this.scrollOffsetY) / lineHeight));
// Convert mouse coordinates from screen pixels to logical coordinates
final int logicalMouseX = (int) (mouseX / this.scaleFactor);
final int logicalMouseY = (int) (mouseY / this.scaleFactor);
final int clickedWrappedLine = Math.max(0, Math.min(wrappedLines.size() - 1, (logicalMouseY + this.scrollOffsetY) / lineHeight));
int rawLineIndex = 0;
int wrappedLineCount = 0;
@@ -492,7 +583,7 @@ public class CustomMultiLineTextArea extends Component {
for (int j = 0; j <= clickedLine.length(); j++) {
final String substr = clickedLine.substring(0, j);
final int textWidth = G2DDrawFont.getTextDimensions(substr, this.getGraphics(), this.fontSize, 1.0).getX();
final int dist = Math.abs((int) (textWidth * this.scaleFactor) - mouseX);
final int dist = Math.abs(textWidth - (logicalMouseX - 2)); // Account for 2px text offset
if (dist < bestDist) {
bestDist = dist;
bestPos = j;
@@ -661,6 +752,89 @@ public class CustomMultiLineTextArea extends Component {
this.dirty = true;
}
private boolean hasSelection() {
return this.caretPosition != this.selectionAnchor;
}
private int getSelectionStart() {
return Math.min(this.caretPosition, this.selectionAnchor);
}
private int getSelectionEnd() {
return Math.max(this.caretPosition, this.selectionAnchor);
}
private String getSelectedText() {
if (!hasSelection()) {
return "";
}
return this.text.substring(getSelectionStart(), getSelectionEnd());
}
private void deleteSelection() {
if (!hasSelection()) {
return;
}
final int start = getSelectionStart();
final int end = getSelectionEnd();
this.text = this.text.substring(0, start) + this.text.substring(end);
this.caretPosition = start;
this.selectionAnchor = start;
notifyTextChanged();
this.dirty = true;
}
private void copy() {
if (!hasSelection()) {
return;
}
final String selectedText = getSelectedText();
final StringSelection selection = new StringSelection(selectedText);
final Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
clipboard.setContents(selection, null);
}
private void cut() {
if (!hasSelection() || this.readonly) {
return;
}
copy();
deleteSelection();
}
private void paste() {
if (this.readonly) {
return;
}
try {
final Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
if (clipboard.isDataFlavorAvailable(DataFlavor.stringFlavor)) {
final String clipboardText = (String) clipboard.getData(DataFlavor.stringFlavor);
if (clipboardText != null && !clipboardText.isEmpty()) {
deleteSelection();
this.text = this.text.substring(0, this.caretPosition) + clipboardText + this.text.substring(this.caretPosition);
this.caretPosition += clipboardText.length();
this.selectionAnchor = this.caretPosition;
ensureCaretVisible();
notifyTextChanged();
this.dirty = true;
}
}
}
catch (final Exception ex) {
}
}
private void selectAll() {
this.selectionAnchor = 0;
this.caretPosition = this.text.length();
this.dirty = true;
}
@Override
public void update(final Graphics g) {
}
@@ -685,7 +859,6 @@ public class CustomMultiLineTextArea extends Component {
final int lineHeight = getLineHeight();
final Color fgColor = this.foregroundColor != null ? this.foregroundColor : theme.getTextNormal().toColor();
g2d.setColor(fgColor);
final var oldClip = g2d.getClip();
g2d.setClip(0, 0, (int) (textAreaWidth * this.scaleFactor), this.getHeight());
@@ -693,13 +866,52 @@ public class CustomMultiLineTextArea extends Component {
final int startLine = Math.max(0, this.scrollOffsetY / lineHeight);
final int endLine = Math.min(wrappedLines.size(), (this.scrollOffsetY + visibleHeight) / lineHeight + 2);
final boolean hasSelection = hasSelection();
final int selStart = hasSelection ? getSelectionStart() : 0;
final int selEnd = hasSelection ? getSelectionEnd() : 0;
for (int i = startLine; i < endLine; i++) {
final String line = wrappedLines.get(i);
final int yPos = i * lineHeight - this.scrollOffsetY;
if (yPos + lineHeight >= 0 && yPos < visibleHeight) {
final var textDim = G2DDrawFont.getTextDimensions(line, g2d, this.fontSize, 1.0);
final var textDimScaled = ImmutableCoordI2.create((int) (textDim.getX() * this.scaleFactor), (int) (textDim.getY() * this.scaleFactor));
G2DDrawFont.renderText(g2d, textDimScaled, this.scaleFactor, 2, yPos, this.fontSize, line);
final int charOffset = getCharOffsetForWrappedLine(i, wrappedLines);
if (hasSelection && charOffset < selEnd && charOffset + line.length() > selStart) {
final int lineSelStart = Math.max(0, selStart - charOffset);
final int lineSelEnd = Math.min(line.length(), selEnd - charOffset);
if (lineSelStart > 0) {
final String beforeSel = line.substring(0, lineSelStart);
final var textDim = G2DDrawFont.getTextDimensions(beforeSel, g2d, this.fontSize, 1.0);
final var textDimScaled = ImmutableCoordI2.create((int) (textDim.getX() * this.scaleFactor), (int) (textDim.getY() * this.scaleFactor));
g2d.setColor(fgColor);
G2DDrawFont.renderText(g2d, textDimScaled, this.scaleFactor, 2, yPos, this.fontSize, beforeSel);
}
final String selected = line.substring(lineSelStart, lineSelEnd);
final String beforeSelText = lineSelStart > 0 ? line.substring(0, lineSelStart) : "";
final var beforeSelTextDim = G2DDrawFont.getTextDimensions(beforeSelText, g2d, this.fontSize, this.scaleFactor);
final int selX = beforeSelTextDim.getX() + 2;
final var selDim = G2DDrawFont.getTextDimensions(selected, g2d, this.fontSize, this.scaleFactor);
g2d.setColor(theme.getSelectionPrimary().toColor());
g2d.fillRect(selX, (int) (yPos * this.scaleFactor), selDim.getX(), (int) (lineHeight * this.scaleFactor));
g2d.setColor(theme.getBackgroundNormal().toColor());
G2DDrawFont.renderText(g2d, null, this.scaleFactor, (int)(selX / this.scaleFactor), yPos, this.fontSize, selected);
if (lineSelEnd < line.length()) {
final String afterSel = line.substring(lineSelEnd);
g2d.setColor(fgColor);
G2DDrawFont.renderText(g2d, null, this.scaleFactor, (int)((selX + selDim.getX()) / this.scaleFactor), yPos, this.fontSize, afterSel);
}
}
else {
final var textDim = G2DDrawFont.getTextDimensions(line, g2d, this.fontSize, 1.0);
final var textDimScaled = ImmutableCoordI2.create((int) (textDim.getX() * this.scaleFactor), (int) (textDim.getY() * this.scaleFactor));
g2d.setColor(fgColor);
G2DDrawFont.renderText(g2d, textDimScaled, this.scaleFactor, 2, yPos, this.fontSize, line);
}
}
}
@@ -743,9 +955,10 @@ public class CustomMultiLineTextArea extends Component {
final String beforeCaret = caretPosInWrappedLine > 0 && caretPosInWrappedLine <= caretWrappedLine.length()
? caretWrappedLine.substring(0, caretPosInWrappedLine)
: "";
final int caretX = (int) (G2DDrawFont.getTextDimensions(beforeCaret, g2d, this.fontSize, 1.0).getX() * this.scaleFactor) + 2;
final var textDim = G2DDrawFont.getTextDimensions(beforeCaret, g2d, this.fontSize, this.scaleFactor);
final int textHeight = textDim.getY();
final int caretX = textDim.getX() + 2;
final int caretY = (int) ((wrappedLineIndex * lineHeight - this.scrollOffsetY) * this.scaleFactor);
final int textHeight = (int) (G2DDrawFont.getTextDimensions("M", g2d, this.fontSize, 1.0).getY() * this.scaleFactor);
if (caretY >= 0 && caretY < this.getHeight()) {
g2d.setColor((currentTime % 1000 < 500) ? theme.getSelectionPrimary().toColor() : theme.getSelectionSecondary().toColor());
@@ -823,4 +1036,15 @@ public class CustomMultiLineTextArea extends Component {
g2d.fillRect((int) ((scrollbarX + 2) * this.scaleFactor), (int) (this.scrollbarThumbY * this.scaleFactor),
(int) ((SCROLLBAR_WIDTH - 4) * this.scaleFactor), (int) (this.scrollbarThumbHeight * this.scaleFactor));
}
private int getCharOffsetForWrappedLine(final int wrappedLineIndex, final List<String> wrappedLines) {
int charOffset = 0;
for (int i = 0; i < wrappedLineIndex && i < wrappedLines.size(); i++) {
charOffset += wrappedLines.get(i).length();
if (i < wrappedLineIndex - 1 || (i < wrappedLines.size() - 1 && wrappedLines.get(i).endsWith(" "))) {
charOffset++;
}
}
return charOffset;
}
}