/**
* Adjusts the given row if possible to fit within the layout span. By default this will try to
* find the highest break weight possible nearest the end of the row. If a forced break is
* encountered, the break will be positioned there.
*
* @param rowIndex the row to adjust to the current layout span.
* @param desiredSpan the current layout span >= 0
* @param x the location r starts at.
*/
protected void adjustRow(FlowView fv, int rowIndex, int desiredSpan, int x) {
final int flowAxis = fv.getFlowAxis();
View r = fv.getView(rowIndex);
int n = r.getViewCount();
int span = 0;
int bestWeight = BadBreakWeight;
int bestSpan = 0;
int bestIndex = -1;
int bestOffset = 0;
View v;
for (int i = 0; i < n; i++) {
v = r.getView(i);
int spanLeft = desiredSpan - span;
int w = v.getBreakWeight(flowAxis, x + span, spanLeft);
if ((w >= bestWeight) && (w > BadBreakWeight)) {
bestWeight = w;
bestIndex = i;
bestSpan = span;
if (w >= ForcedBreakWeight) {
// it's a forced break, so there is
// no point in searching further.
break;
}
}
span += v.getPreferredSpan(flowAxis);
}
if (bestIndex < 0) {
// there is nothing that can be broken, leave
// it in it's current state.
return;
}
// Break the best candidate view, and patch up the row.
int spanLeft = desiredSpan - bestSpan;
v = r.getView(bestIndex);
v = v.breakView(flowAxis, v.getStartOffset(), x + bestSpan, spanLeft);
View[] va = new View[1];
va[0] = v;
View lv = getLogicalView(fv);
for (int i = bestIndex; i < n; i++) {
View tmpView = r.getView(i);
if (contains(lv, tmpView)) {
tmpView.setParent(lv);
} else if (tmpView.getViewCount() > 0) {
recursiveReparent(tmpView, lv);
}
}
r.replace(bestIndex, n - bestIndex, va);
}
/**
* Update the flow on the given FlowView. By default, this causes all of the rows (child views)
* to be rebuilt to match the given constraints for each row. This is called by a
* FlowView.layout to update the child views in the flow.
*
* @param fv the view to reflow
*/
public void layout(FlowView fv) {
int p0 = fv.getStartOffset();
int p1 = fv.getEndOffset();
// we want to preserve all views from the logicalView from being
// removed
View lv = getLogicalView(fv);
int n = lv.getViewCount();
for (int i = 0; i < n; i++) {
View v = lv.getView(i);
v.setParent(lv);
}
fv.removeAll();
for (int rowIndex = 0; p0 < p1; rowIndex++) {
View row = fv.createRow();
fv.append(row);
// layout the row to the current span. If nothing fits,
// force something.
int next = layoutRow(fv, rowIndex, p0);
if (row.getViewCount() == 0) {
row.append(createView(fv, p0, Integer.MAX_VALUE, rowIndex));
next = row.getEndOffset();
}
if (next <= p0) {
throw new StateInvariantError("infinite loop in formatting");
} else {
p0 = next;
}
}
}
private boolean contains(View logicalView, View v) {
int n = logicalView.getViewCount();
for (int i = 0; i < n; i++) {
if (logicalView.getView(i) == v) {
return true;
}
}
return false;
}
private void recursiveReparent(View v, View logicalView) {
int n = v.getViewCount();
for (int i = 0; i < n; i++) {
View tmpView = v.getView(i);
if (contains(logicalView, tmpView)) {
tmpView.setParent(logicalView);
} else {
recursiveReparent(tmpView, logicalView);
}
}
}
/**
* GlyphGutter copy pasted bolerplate method. It invokes {@link #paintView} that contains actual
* business logic.
*/
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Rectangle clip = g.getClipBounds();
JTextComponent component = editorUI.getComponent();
if (component == null) return;
BaseTextUI textUI = (BaseTextUI) component.getUI();
View rootView = Utilities.getDocumentView(component);
if (rootView == null) return;
g.setColor(backgroundColor());
g.fillRect(clip.x, clip.y, clip.width, clip.height);
AbstractDocument doc = (AbstractDocument) component.getDocument();
doc.readLock();
try {
foldHierarchy.lock();
try {
int startPos = textUI.getPosFromY(clip.y);
int startViewIndex = rootView.getViewIndex(startPos, Position.Bias.Forward);
int rootViewCount = rootView.getViewCount();
if (startViewIndex >= 0 && startViewIndex < rootViewCount) {
int clipEndY = clip.y + clip.height;
for (int i = startViewIndex; i < rootViewCount; i++) {
View view = rootView.getView(i);
Rectangle rec = component.modelToView(view.getStartOffset());
if (rec == null) {
break;
}
int y = rec.y;
paintView(view, g, y);
if (y >= clipEndY) {
break;
}
}
}
} finally {
foldHierarchy.unlock();
}
} catch (BadLocationException ble) {
Mercurial.LOG.log(Level.WARNING, null, ble);
} finally {
doc.readUnlock();
}
}
/**
* Creates a view that can be used to represent the current piece of the flow. This can be
* either an entire view from the logical view, or a fragment of the logical view.
*
* @param fv the view holding the flow
* @param startOffset the start location for the view being created
* @param spanLeft the about of span left to fill in the row
* @param rowIndex the row the view will be placed into
*/
protected View createView(FlowView fv, int startOffset, int spanLeft, int rowIndex) {
// Get the child view that contains the given starting position
View lv = getLogicalView(fv);
int childIndex = lv.getViewIndex(startOffset, Position.Bias.Forward);
View v = lv.getView(childIndex);
if (startOffset == v.getStartOffset()) {
// return the entire view
return v;
}
// return a fragment.
v = v.createFragment(startOffset, v.getEndOffset());
return v;
}
/** Returns the baseline for single line text components, like <code>JTextField</code>. */
private static int getSingleLineTextBaseline(JTextComponent textComponent, int h) {
View rootView = textComponent.getUI().getRootView(textComponent);
if (rootView.getViewCount() > 0) {
Insets insets = textComponent.getInsets();
int height = h - insets.top - insets.bottom;
int y = insets.top;
View fieldView = rootView.getView(0);
int vspan = (int) fieldView.getPreferredSpan(View.Y_AXIS);
if (height != vspan) {
int slop = height - vspan;
y += slop / 2;
}
FontMetrics fm = textComponent.getFontMetrics(textComponent.getFont());
y += fm.getAscent();
return y;
}
return -1;
}
