/**
* Repaints area of the control corresponding to a range of offsets in the document.
*
* @param startOffset Starting offset of the range.
* @param endOffset Ending offset of the range.
*/
private void repaintRange(int startOffset, int endOffset) {
Graphics g = this.hostComponent.createDefaultGraphics();
LayoutContext context = this.createLayoutContext(g);
Rectangle startBounds = this.rootBox.getCaret(context, startOffset).getBounds();
int top1 = startBounds.getY();
int bottom1 = top1 + startBounds.getHeight();
Rectangle endBounds = this.rootBox.getCaret(context, endOffset).getBounds();
int top2 = endBounds.getY();
int bottom2 = top2 + endBounds.getHeight();
int top = Math.min(top1, top2);
int bottom = Math.max(bottom1, bottom2);
if (top == bottom) {
// Account for zero-height horizontal carets
this.hostComponent.repaint(0, top - 1, this.getLayoutWidth(), bottom - top + 1);
} else {
this.hostComponent.repaint(0, top, this.getLayoutWidth(), bottom - top);
}
g.dispose();
}
/**
* Calls layout() on the rootBox until the y-coordinate of a caret at the given offset converges,
* i.e. is less than LAYOUT_TOLERANCE pixels from the last call.
*
* @param offset Offset around which we should lay out boxes.
*/
private void iterateLayout(int offset) {
int repaintStart = Integer.MAX_VALUE;
int repaintEnd = 0;
Graphics g = this.hostComponent.createDefaultGraphics();
LayoutContext context = this.createLayoutContext(g);
int layoutY = this.rootBox.getCaret(context, offset).getY();
while (true) {
int oldLayoutY = layoutY;
IntRange repaintRange =
this.rootBox.layout(context, layoutY - LAYOUT_WINDOW / 2, layoutY + LAYOUT_WINDOW / 2);
if (repaintRange != null) {
repaintStart = Math.min(repaintStart, repaintRange.getStart());
repaintEnd = Math.max(repaintEnd, repaintRange.getEnd());
}
layoutY = this.rootBox.getCaret(context, offset).getY();
if (Math.abs(layoutY - oldLayoutY) < LAYOUT_TOLERANCE) {
break;
}
}
g.dispose();
if (repaintStart < repaintEnd) {
Rectangle viewport = this.hostComponent.getViewport();
if (repaintStart < viewport.getY() + viewport.getHeight() && repaintEnd > viewport.getY()) {
int start = Math.max(repaintStart, viewport.getY());
int end = Math.min(repaintEnd, viewport.getY() + viewport.getHeight());
this.hostComponent.repaint(viewport.getX(), start, viewport.getWidth(), end - start);
}
}
}
public int viewToModel(int x, int y) {
Graphics g = this.hostComponent.createDefaultGraphics();
LayoutContext context = this.createLayoutContext(g);
int offset = this.rootBox.viewToModel(context, x, y);
g.dispose();
return offset;
}
public void moveToPreviousLine(boolean select) {
int x = this.magicX == -1 ? this.caret.getBounds().getX() : this.magicX;
Graphics g = this.hostComponent.createDefaultGraphics();
int offset =
this.rootBox.getPreviousLineOffset(this.createLayoutContext(g), this.getCaretOffset(), x);
g.dispose();
this.moveTo(offset, select);
this.magicX = x;
}
/** Lay out the area around the caret. */
private void relayout() {
long start = System.currentTimeMillis();
int oldHeight = this.rootBox.getHeight();
this.iterateLayout(this.getCaretOffset());
if (this.rootBox.getHeight() != oldHeight) {
this.hostComponent.setPreferredSize(this.rootBox.getWidth(), this.rootBox.getHeight());
}
Graphics g = this.hostComponent.createDefaultGraphics();
LayoutContext context = this.createLayoutContext(g);
this.caret = this.rootBox.getCaret(context, this.getCaretOffset());
g.dispose();
if (this.isDebugging()) {
long end = System.currentTimeMillis();
System.out.println("VexWidget layout took " + (end - start) + "ms");
}
}
public void moveTo(int offset, boolean select) {
if (offset >= 1 && offset <= this.document.getLength() - 1) {
// repaint the selection area, if any
this.repaintCaret();
this.repaintRange(this.getSelectionStart(), this.getSelectionEnd());
VEXElement oldElement = this.currentElement;
this.caretOffset = offset;
this.currentElement = this.document.getElementAt(offset);
if (select) {
this.selectionStart = Math.min(this.mark, this.caretOffset);
this.selectionEnd = Math.max(this.mark, this.caretOffset);
// move selectionStart and selectionEnd to make sure we don't
// select a partial element
VEXElement commonElement =
this.document.findCommonElement(this.selectionStart, this.selectionEnd);
VEXElement element = this.document.getElementAt(this.selectionStart);
while (element != commonElement) {
this.selectionStart = element.getStartOffset();
element = this.document.getElementAt(this.selectionStart);
}
element = this.document.getElementAt(this.selectionEnd);
while (element != commonElement) {
this.selectionEnd = element.getEndOffset() + 1;
element = this.document.getElementAt(this.selectionEnd);
}
} else {
this.mark = offset;
this.selectionStart = offset;
this.selectionEnd = offset;
}
if (this.beginWorkCount == 0) {
this.relayout();
}
Graphics g = this.hostComponent.createDefaultGraphics();
LayoutContext context = this.createLayoutContext(g);
this.caret = this.rootBox.getCaret(context, offset);
VEXElement element = this.getCurrentElement();
if (element != oldElement) {
this.caretColor = Color.BLACK;
while (element != null) {
Color bgColor = this.styleSheet.getStyles(element).getBackgroundColor();
if (bgColor != null) {
int red = ~bgColor.getRed() & 0xff;
int green = ~bgColor.getGreen() & 0xff;
int blue = ~bgColor.getBlue() & 0xff;
this.caretColor = new Color(red, green, blue);
break;
}
element = element.getParent();
}
}
g.dispose();
this.magicX = -1;
this.scrollCaretVisible();
this.hostComponent.fireSelectionChanged();
this.caretVisible = true;
this.repaintRange(this.getSelectionStart(), this.getSelectionEnd());
}
}
/**
* Re-layout the entire widget, due to either a layout width change or a stylesheet range. This
* method does the actual setting of the width and stylesheet, since it needs to know where the
* caret is <i>before</i> the change, so that it can do a reasonable job of restoring the position
* of the viewport after the change.
*
* @param newWidth New width for the widget.
* @param newStyleSheet New stylesheet for the widget.
*/
private void relayoutAll(int newWidth, StyleSheet newStyleSheet) {
Graphics g = this.hostComponent.createDefaultGraphics();
LayoutContext context = this.createLayoutContext(g);
Rectangle viewport = this.hostComponent.getViewport();
// true if the caret is within the viewport
//
// TODO: incorrect if caret near the bottom and the viewport is
// shrinking
// To fix, we probably need to save the viewport height, just like
// we now store viewport width (as layout width).
boolean caretVisible = viewport.intersects(this.caret.getBounds());
// distance from the top of the viewport to the top of the caret
// use this if the caret is visible in the viewport
int relCaretY = 0;
// offset around which we are laying out
// this is also where we put the top of the viewport if the caret
// isn't visible
int offset;
if (caretVisible) {
relCaretY = this.caret.getY() - viewport.getY();
offset = this.getCaretOffset();
} else {
offset = this.rootBox.viewToModel(context, 0, viewport.getY());
}
this.layoutWidth = newWidth;
this.styleSheet = newStyleSheet;
// Re-create the context, since it holds the old stylesheet
context = this.createLayoutContext(g);
this.createRootBox();
this.iterateLayout(offset);
this.hostComponent.setPreferredSize(this.rootBox.getWidth(), this.rootBox.getHeight());
this.caret = this.rootBox.getCaret(context, this.getCaretOffset());
if (caretVisible) {
int viewportY = this.caret.getY() - Math.min(relCaretY, viewport.getHeight());
viewportY = Math.min(this.rootBox.getHeight() - viewport.getHeight(), viewportY);
viewportY = Math.max(0, viewportY); // this must appear after the
// above line, since
// that line might set viewportY negative
this.hostComponent.scrollTo(viewport.getX(), viewportY);
this.scrollCaretVisible();
} else {
int viewportY = this.rootBox.getCaret(context, offset).getY();
this.hostComponent.scrollTo(viewport.getX(), viewportY);
}
this.hostComponent.repaint();
g.dispose();
}
private void createRootBox() {
Graphics g = this.hostComponent.createDefaultGraphics();
LayoutContext context = this.createLayoutContext(g);
this.rootBox = new RootBox(context, this.document.getRootElement(), this.getLayoutWidth());
g.dispose();
}