Java example source code file (FlowView.java)
The FlowView.java Java example source code
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package javax.swing.text;
import java.awt.*;
import java.util.Vector;
import javax.swing.event.*;
import javax.swing.SizeRequirements;
/**
* A View that tries to flow it's children into some
* partially constrained space. This can be used to
* build things like paragraphs, pages, etc. The
* flow is made up of the following pieces of functionality.
* <ul>
* <li>A logical set of child views, which as used as a
* layout pool from which a physical view is formed.
* <li>A strategy for translating the logical view to
* a physical (flowed) view.
* <li>Constraints for the strategy to work against.
* <li>A physical structure, that represents the flow.
* The children of this view are where the pieces of
* of the logical views are placed to create the flow.
* </ul>
*
* @author Timothy Prinzing
* @see View
* @since 1.3
*/
public abstract class FlowView extends BoxView {
/**
* Constructs a FlowView for the given element.
*
* @param elem the element that this view is responsible for
* @param axis may be either View.X_AXIS or View.Y_AXIS
*/
public FlowView(Element elem, int axis) {
super(elem, axis);
layoutSpan = Integer.MAX_VALUE;
strategy = new FlowStrategy();
}
/**
* Fetches the axis along which views should be
* flowed. By default, this will be the axis
* orthogonal to the axis along which the flow
* rows are tiled (the axis of the default flow
* rows themselves). This is typically used
* by the <code>FlowStrategy.
*/
public int getFlowAxis() {
if (getAxis() == Y_AXIS) {
return X_AXIS;
}
return Y_AXIS;
}
/**
* Fetch the constraining span to flow against for
* the given child index. This is called by the
* FlowStrategy while it is updating the flow.
* A flow can be shaped by providing different values
* for the row constraints. By default, the entire
* span inside of the insets along the flow axis
* is returned.
*
* @param index the index of the row being updated.
* This should be a value >= 0 and < getViewCount().
* @see #getFlowStart
*/
public int getFlowSpan(int index) {
return layoutSpan;
}
/**
* Fetch the location along the flow axis that the
* flow span will start at. This is called by the
* FlowStrategy while it is updating the flow.
* A flow can be shaped by providing different values
* for the row constraints.
* @param index the index of the row being updated.
* This should be a value >= 0 and < getViewCount().
* @see #getFlowSpan
*/
public int getFlowStart(int index) {
return 0;
}
/**
* Create a View that should be used to hold a
* a rows worth of children in a flow. This is
* called by the FlowStrategy when new children
* are added or removed (i.e. rows are added or
* removed) in the process of updating the flow.
*/
protected abstract View createRow();
// ---- BoxView methods -------------------------------------
/**
* Loads all of the children to initialize the view.
* This is called by the <code>setParent method.
* This is reimplemented to not load any children directly
* (as they are created in the process of formatting).
* If the layoutPool variable is null, an instance of
* LogicalView is created to represent the logical view
* that is used in the process of formatting.
*
* @param f the view factory
*/
protected void loadChildren(ViewFactory f) {
if (layoutPool == null) {
layoutPool = new LogicalView(getElement());
}
layoutPool.setParent(this);
// This synthetic insertUpdate call gives the strategy a chance
// to initialize.
strategy.insertUpdate(this, null, null);
}
/**
* Fetches the child view index representing the given position in
* the model.
*
* @param pos the position >= 0
* @return index of the view representing the given position, or
* -1 if no view represents that position
*/
protected int getViewIndexAtPosition(int pos) {
if (pos >= getStartOffset() && (pos < getEndOffset())) {
for (int counter = 0; counter < getViewCount(); counter++) {
View v = getView(counter);
if(pos >= v.getStartOffset() &&
pos < v.getEndOffset()) {
return counter;
}
}
}
return -1;
}
/**
* Lays out the children. If the span along the flow
* axis has changed, layout is marked as invalid which
* which will cause the superclass behavior to recalculate
* the layout along the box axis. The FlowStrategy.layout
* method will be called to rebuild the flow rows as
* appropriate. If the height of this view changes
* (determined by the preferred size along the box axis),
* a preferenceChanged is called. Following all of that,
* the normal box layout of the superclass is performed.
*
* @param width the width to lay out against >= 0. This is
* the width inside of the inset area.
* @param height the height to lay out against >= 0 This
* is the height inside of the inset area.
*/
protected void layout(int width, int height) {
final int faxis = getFlowAxis();
int newSpan;
if (faxis == X_AXIS) {
newSpan = width;
} else {
newSpan = height;
}
if (layoutSpan != newSpan) {
layoutChanged(faxis);
layoutChanged(getAxis());
layoutSpan = newSpan;
}
// repair the flow if necessary
if (! isLayoutValid(faxis)) {
final int heightAxis = getAxis();
int oldFlowHeight = (heightAxis == X_AXIS)? getWidth() : getHeight();
strategy.layout(this);
int newFlowHeight = (int) getPreferredSpan(heightAxis);
if (oldFlowHeight != newFlowHeight) {
View p = getParent();
if (p != null) {
p.preferenceChanged(this, (heightAxis == X_AXIS), (heightAxis == Y_AXIS));
}
// PENDING(shannonh)
// Temporary fix for 4250847
// Can be removed when TraversalContext is added
Component host = getContainer();
if (host != null) {
//nb idk 12/12/2001 host should not be equal to null. We need to add assertion here
host.repaint();
}
}
}
super.layout(width, height);
}
/**
* Calculate requirements along the minor axis. This
* is implemented to forward the request to the logical
* view by calling getMinimumSpan, getPreferredSpan, and
* getMaximumSpan on it.
*/
protected SizeRequirements calculateMinorAxisRequirements(int axis, SizeRequirements r) {
if (r == null) {
r = new SizeRequirements();
}
float pref = layoutPool.getPreferredSpan(axis);
float min = layoutPool.getMinimumSpan(axis);
// Don't include insets, Box.getXXXSpan will include them.
r.minimum = (int)min;
r.preferred = Math.max(r.minimum, (int) pref);
r.maximum = Integer.MAX_VALUE;
r.alignment = 0.5f;
return r;
}
// ---- View methods ----------------------------------------------------
/**
* Gives notification that something was inserted into the document
* in a location that this view is responsible for.
*
* @param changes the change information from the associated document
* @param a the current allocation of the view
* @param f the factory to use to rebuild if the view has children
* @see View#insertUpdate
*/
public void insertUpdate(DocumentEvent changes, Shape a, ViewFactory f) {
layoutPool.insertUpdate(changes, a, f);
strategy.insertUpdate(this, changes, getInsideAllocation(a));
}
/**
* Gives notification that something was removed from the document
* in a location that this view is responsible for.
*
* @param changes the change information from the associated document
* @param a the current allocation of the view
* @param f the factory to use to rebuild if the view has children
* @see View#removeUpdate
*/
public void removeUpdate(DocumentEvent changes, Shape a, ViewFactory f) {
layoutPool.removeUpdate(changes, a, f);
strategy.removeUpdate(this, changes, getInsideAllocation(a));
}
/**
* Gives notification from the document that attributes were changed
* in a location that this view is responsible for.
*
* @param changes the change information from the associated document
* @param a the current allocation of the view
* @param f the factory to use to rebuild if the view has children
* @see View#changedUpdate
*/
public void changedUpdate(DocumentEvent changes, Shape a, ViewFactory f) {
layoutPool.changedUpdate(changes, a, f);
strategy.changedUpdate(this, changes, getInsideAllocation(a));
}
/** {@inheritDoc} */
public void setParent(View parent) {
super.setParent(parent);
if (parent == null
&& layoutPool != null ) {
layoutPool.setParent(null);
}
}
// --- variables -----------------------------------------------
/**
* Default constraint against which the flow is
* created against.
*/
protected int layoutSpan;
/**
* These are the views that represent the child elements
* of the element this view represents (The logical view
* to translate to a physical view). These are not
* directly children of this view. These are either
* placed into the rows directly or used for the purpose
* of breaking into smaller chunks, to form the physical
* view.
*/
protected View layoutPool;
/**
* The behavior for keeping the flow updated. By
* default this is a singleton shared by all instances
* of FlowView (FlowStrategy is stateless). Subclasses
* can create an alternative strategy, which might keep
* state.
*/
protected FlowStrategy strategy;
/**
* Strategy for maintaining the physical form
* of the flow. The default implementation is
* completely stateless, and recalculates the
* entire flow if the layout is invalid on the
* given FlowView. Alternative strategies can
* be implemented by subclassing, and might
* perform incremental repair to the layout
* or alternative breaking behavior.
* @since 1.3
*/
public static class FlowStrategy {
Position damageStart = null;
Vector<View> viewBuffer;
void addDamage(FlowView fv, int offset) {
if (offset >= fv.getStartOffset() && offset < fv.getEndOffset()) {
if (damageStart == null || offset < damageStart.getOffset()) {
try {
damageStart = fv.getDocument().createPosition(offset);
} catch (BadLocationException e) {
// shouldn't happen since offset is inside view bounds
assert(false);
}
}
}
}
void unsetDamage() {
damageStart = null;
}
/**
* Gives notification that something was inserted into the document
* in a location that the given flow view is responsible for. The
* strategy should update the appropriate changed region (which
* depends upon the strategy used for repair).
*
* @param e the change information from the associated document
* @param alloc the current allocation of the view inside of the insets.
* This value will be null if the view has not yet been displayed.
* @see View#insertUpdate
*/
public void insertUpdate(FlowView fv, DocumentEvent e, Rectangle alloc) {
// FlowView.loadChildren() makes a synthetic call into this,
// passing null as e
if (e != null) {
addDamage(fv, e.getOffset());
}
if (alloc != null) {
Component host = fv.getContainer();
if (host != null) {
host.repaint(alloc.x, alloc.y, alloc.width, alloc.height);
}
} else {
fv.preferenceChanged(null, true, true);
}
}
/**
* Gives notification that something was removed from the document
* in a location that the given flow view is responsible for.
*
* @param e the change information from the associated document
* @param alloc the current allocation of the view inside of the insets.
* @see View#removeUpdate
*/
public void removeUpdate(FlowView fv, DocumentEvent e, Rectangle alloc) {
addDamage(fv, e.getOffset());
if (alloc != null) {
Component host = fv.getContainer();
if (host != null) {
host.repaint(alloc.x, alloc.y, alloc.width, alloc.height);
}
} else {
fv.preferenceChanged(null, true, true);
}
}
/**
* Gives notification from the document that attributes were changed
* in a location that this view is responsible for.
*
* @param fv the <code>FlowView containing the changes
* @param e the <code>DocumentEvent describing the changes
* done to the Document
* @param alloc Bounds of the View
* @see View#changedUpdate
*/
public void changedUpdate(FlowView fv, DocumentEvent e, Rectangle alloc) {
addDamage(fv, e.getOffset());
if (alloc != null) {
Component host = fv.getContainer();
if (host != null) {
host.repaint(alloc.x, alloc.y, alloc.width, alloc.height);
}
} else {
fv.preferenceChanged(null, true, true);
}
}
/**
* This method gives flow strategies access to the logical
* view of the FlowView.
*/
protected View getLogicalView(FlowView fv) {
return fv.layoutPool;
}
/**
* 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) {
View pool = getLogicalView(fv);
int rowIndex, p0;
int p1 = fv.getEndOffset();
if (fv.majorAllocValid) {
if (damageStart == null) {
return;
}
// In some cases there's no view at position damageStart, so
// step back and search again. See 6452106 for details.
int offset = damageStart.getOffset();
while ((rowIndex = fv.getViewIndexAtPosition(offset)) < 0) {
offset--;
}
if (rowIndex > 0) {
rowIndex--;
}
p0 = fv.getView(rowIndex).getStartOffset();
} else {
rowIndex = 0;
p0 = fv.getStartOffset();
}
reparentViews(pool, p0);
viewBuffer = new Vector<View>(10, 10);
int rowCount = fv.getViewCount();
while (p0 < p1) {
View row;
if (rowIndex >= rowCount) {
row = fv.createRow();
fv.append(row);
} else {
row = fv.getView(rowIndex);
}
p0 = layoutRow(fv, rowIndex, p0);
rowIndex++;
}
viewBuffer = null;
if (rowIndex < rowCount) {
fv.replace(rowIndex, rowCount - rowIndex, null);
}
unsetDamage();
}
/**
* Creates a row of views that will fit within the
* layout span of the row. This is called by the layout method.
* This is implemented to fill the row by repeatedly calling
* the createView method until the available span has been
* exhausted, a forced break was encountered, or the createView
* method returned null. If the remaining span was exhausted,
* the adjustRow method will be called to perform adjustments
* to the row to try and make it fit into the given span.
*
* @param rowIndex the index of the row to fill in with views. The
* row is assumed to be empty on entry.
* @param pos The current position in the children of
* this views element from which to start.
* @return the position to start the next row
*/
protected int layoutRow(FlowView fv, int rowIndex, int pos) {
View row = fv.getView(rowIndex);
float x = fv.getFlowStart(rowIndex);
float spanLeft = fv.getFlowSpan(rowIndex);
int end = fv.getEndOffset();
TabExpander te = (fv instanceof TabExpander) ? (TabExpander)fv : null;
final int flowAxis = fv.getFlowAxis();
int breakWeight = BadBreakWeight;
float breakX = 0f;
float breakSpan = 0f;
int breakIndex = -1;
int n = 0;
viewBuffer.clear();
while (pos < end && spanLeft >= 0) {
View v = createView(fv, pos, (int)spanLeft, rowIndex);
if (v == null) {
break;
}
int bw = v.getBreakWeight(flowAxis, x, spanLeft);
if (bw >= ForcedBreakWeight) {
View w = v.breakView(flowAxis, pos, x, spanLeft);
if (w != null) {
viewBuffer.add(w);
} else if (n == 0) {
// if the view does not break, and it is the only view
// in a row, use the whole view
viewBuffer.add(v);
}
break;
} else if (bw >= breakWeight && bw > BadBreakWeight) {
breakWeight = bw;
breakX = x;
breakSpan = spanLeft;
breakIndex = n;
}
float chunkSpan;
if (flowAxis == X_AXIS && v instanceof TabableView) {
chunkSpan = ((TabableView)v).getTabbedSpan(x, te);
} else {
chunkSpan = v.getPreferredSpan(flowAxis);
}
if (chunkSpan > spanLeft && breakIndex >= 0) {
// row is too long, and we may break
if (breakIndex < n) {
v = viewBuffer.get(breakIndex);
}
for (int i = n - 1; i >= breakIndex; i--) {
viewBuffer.remove(i);
}
v = v.breakView(flowAxis, v.getStartOffset(), breakX, breakSpan);
}
spanLeft -= chunkSpan;
x += chunkSpan;
viewBuffer.add(v);
pos = v.getEndOffset();
n++;
}
View[] views = new View[viewBuffer.size()];
viewBuffer.toArray(views);
row.replace(0, row.getViewCount(), views);
return (views.length > 0 ? row.getEndOffset() : pos);
}
/**
* 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;
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);
int p0 = r.getView(bestIndex).getStartOffset();
int p1 = r.getEndOffset();
for (int i = 0; i < lv.getViewCount(); i++) {
View tmpView = lv.getView(i);
if (tmpView.getEndOffset() > p1) {
break;
}
if (tmpView.getStartOffset() >= p0) {
tmpView.setParent(lv);
}
}
r.replace(bestIndex, n - bestIndex, va);
}
void reparentViews(View pool, int startPos) {
int n = pool.getViewIndex(startPos, Position.Bias.Forward);
if (n >= 0) {
for (int i = n; i < pool.getViewCount(); i++) {
pool.getView(i).setParent(pool);
}
}
}
/**
* 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;
}
}
/**
* This class can be used to represent a logical view for
* a flow. It keeps the children updated to reflect the state
* of the model, gives the logical child views access to the
* view hierarchy, and calculates a preferred span. It doesn't
* do any rendering, layout, or model/view translation.
*/
static class LogicalView extends CompositeView {
LogicalView(Element elem) {
super(elem);
}
protected int getViewIndexAtPosition(int pos) {
Element elem = getElement();
if (elem.isLeaf()) {
return 0;
}
return super.getViewIndexAtPosition(pos);
}
protected void loadChildren(ViewFactory f) {
Element elem = getElement();
if (elem.isLeaf()) {
View v = new LabelView(elem);
append(v);
} else {
super.loadChildren(f);
}
}
/**
* Fetches the attributes to use when rendering. This view
* isn't directly responsible for an element so it returns
* the outer classes attributes.
*/
public AttributeSet getAttributes() {
View p = getParent();
return (p != null) ? p.getAttributes() : null;
}
/**
* Determines the preferred span for this view along an
* axis.
*
* @param axis may be either View.X_AXIS or View.Y_AXIS
* @return the span the view would like to be rendered into.
* Typically the view is told to render into the span
* that is returned, although there is no guarantee.
* The parent may choose to resize or break the view.
* @see View#getPreferredSpan
*/
public float getPreferredSpan(int axis) {
float maxpref = 0;
float pref = 0;
int n = getViewCount();
for (int i = 0; i < n; i++) {
View v = getView(i);
pref += v.getPreferredSpan(axis);
if (v.getBreakWeight(axis, 0, Integer.MAX_VALUE) >= ForcedBreakWeight) {
maxpref = Math.max(maxpref, pref);
pref = 0;
}
}
maxpref = Math.max(maxpref, pref);
return maxpref;
}
/**
* Determines the minimum span for this view along an
* axis. The is implemented to find the minimum unbreakable
* span.
*
* @param axis may be either View.X_AXIS or View.Y_AXIS
* @return the span the view would like to be rendered into.
* Typically the view is told to render into the span
* that is returned, although there is no guarantee.
* The parent may choose to resize or break the view.
* @see View#getPreferredSpan
*/
public float getMinimumSpan(int axis) {
float maxmin = 0;
float min = 0;
boolean nowrap = false;
int n = getViewCount();
for (int i = 0; i < n; i++) {
View v = getView(i);
if (v.getBreakWeight(axis, 0, Integer.MAX_VALUE) == BadBreakWeight) {
min += v.getPreferredSpan(axis);
nowrap = true;
} else if (nowrap) {
maxmin = Math.max(min, maxmin);
nowrap = false;
min = 0;
}
if (v instanceof ComponentView) {
maxmin = Math.max(maxmin, v.getMinimumSpan(axis));
}
}
maxmin = Math.max(maxmin, min);
return maxmin;
}
/**
* Forward the DocumentEvent to the given child view. This
* is implemented to reparent the child to the logical view
* (the children may have been parented by a row in the flow
* if they fit without breaking) and then execute the superclass
* behavior.
*
* @param v the child view to forward the event to.
* @param e the change information from the associated document
* @param a the current allocation of the view
* @param f the factory to use to rebuild if the view has children
* @see #forwardUpdate
* @since 1.3
*/
protected void forwardUpdateToView(View v, DocumentEvent e,
Shape a, ViewFactory f) {
View parent = v.getParent();
v.setParent(this);
super.forwardUpdateToView(v, e, a, f);
v.setParent(parent);
}
/** {@inheritDoc} */
@Override
protected void forwardUpdate(DocumentEvent.ElementChange ec,
DocumentEvent e, Shape a, ViewFactory f) {
calculateUpdateIndexes(e);
// Send update event to all views followed by the changed place.
lastUpdateIndex = Math.max((getViewCount() - 1), 0);
for (int i = firstUpdateIndex; i <= lastUpdateIndex; i++) {
View v = getView(i);
if (v != null) {
Shape childAlloc = getChildAllocation(i, a);
forwardUpdateToView(v, e, childAlloc, f);
}
}
}
// The following methods don't do anything useful, they
// simply keep the class from being abstract.
/**
* Renders using the given rendering surface and area on that
* surface. This is implemented to do nothing, the logical
* view is never visible.
*
* @param g the rendering surface to use
* @param allocation the allocated region to render into
* @see View#paint
*/
public void paint(Graphics g, Shape allocation) {
}
/**
* Tests whether a point lies before the rectangle range.
* Implemented to return false, as hit detection is not
* performed on the logical view.
*
* @param x the X coordinate >= 0
* @param y the Y coordinate >= 0
* @param alloc the rectangle
* @return true if the point is before the specified range
*/
protected boolean isBefore(int x, int y, Rectangle alloc) {
return false;
}
/**
* Tests whether a point lies after the rectangle range.
* Implemented to return false, as hit detection is not
* performed on the logical view.
*
* @param x the X coordinate >= 0
* @param y the Y coordinate >= 0
* @param alloc the rectangle
* @return true if the point is after the specified range
*/
protected boolean isAfter(int x, int y, Rectangle alloc) {
return false;
}
/**
* Fetches the child view at the given point.
* Implemented to return null, as hit detection is not
* performed on the logical view.
*
* @param x the X coordinate >= 0
* @param y the Y coordinate >= 0
* @param alloc the parent's allocation on entry, which should
* be changed to the child's allocation on exit
* @return the child view
*/
protected View getViewAtPoint(int x, int y, Rectangle alloc) {
return null;
}
/**
* Returns the allocation for a given child.
* Implemented to do nothing, as the logical view doesn't
* perform layout on the children.
*
* @param index the index of the child, >= 0 && < getViewCount()
* @param a the allocation to the interior of the box on entry,
* and the allocation of the child view at the index on exit.
*/
protected void childAllocation(int index, Rectangle a) {
}
}
}
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