mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-28 21:49:33 +00:00
842 lines
26 KiB
Java
842 lines
26 KiB
Java
/* FlowView.java -- A composite View
|
|
Copyright (C) 2005 Free Software Foundation, Inc.
|
|
|
|
This file is part of GNU Classpath.
|
|
|
|
GNU Classpath is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
GNU Classpath is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
|
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
02110-1301 USA.
|
|
|
|
Linking this library statically or dynamically with other modules is
|
|
making a combined work based on this library. Thus, the terms and
|
|
conditions of the GNU General Public License cover the whole
|
|
combination.
|
|
|
|
As a special exception, the copyright holders of this library give you
|
|
permission to link this library with independent modules to produce an
|
|
executable, regardless of the license terms of these independent
|
|
modules, and to copy and distribute the resulting executable under
|
|
terms of your choice, provided that you also meet, for each linked
|
|
independent module, the terms and conditions of the license of that
|
|
module. An independent module is a module which is not derived from
|
|
or based on this library. If you modify this library, you may extend
|
|
this exception to your version of the library, but you are not
|
|
obligated to do so. If you do not wish to do so, delete this
|
|
exception statement from your version. */
|
|
|
|
|
|
package javax.swing.text;
|
|
|
|
import java.awt.Component;
|
|
import java.awt.Graphics;
|
|
import java.awt.Rectangle;
|
|
import java.awt.Shape;
|
|
|
|
import javax.swing.SizeRequirements;
|
|
import javax.swing.event.DocumentEvent;
|
|
|
|
/**
|
|
* A <code>View</code> that can flows it's children into it's layout space.
|
|
*
|
|
* The <code>FlowView</code> manages a set of logical views (that are
|
|
* the children of the {@link #layoutPool} field). These are translated
|
|
* at layout time into a set of physical views. These are the views that
|
|
* are managed as the real child views. Each of these child views represents
|
|
* a row and are laid out within a box using the superclasses behaviour.
|
|
* The concrete implementation of the rows must be provided by subclasses.
|
|
*
|
|
* @author Roman Kennke (roman@kennke.org)
|
|
*/
|
|
public abstract class FlowView extends BoxView
|
|
{
|
|
/**
|
|
* A strategy for translating the logical views of a <code>FlowView</code>
|
|
* into the real views.
|
|
*/
|
|
public static class FlowStrategy
|
|
{
|
|
/**
|
|
* Creates a new instance of <code>FlowStragegy</code>.
|
|
*/
|
|
public FlowStrategy()
|
|
{
|
|
// Nothing to do here.
|
|
}
|
|
|
|
/**
|
|
* Receives notification from a <code>FlowView</code> that some content
|
|
* has been inserted into the document at a location that the
|
|
* <code>FlowView</code> is responsible for.
|
|
*
|
|
* The default implementation simply calls {@link #layout}.
|
|
*
|
|
* @param fv the flow view that sends the notification
|
|
* @param e the document event describing the change
|
|
* @param alloc the current allocation of the flow view
|
|
*/
|
|
public void insertUpdate(FlowView fv, DocumentEvent e, Rectangle alloc)
|
|
{
|
|
if (alloc == null)
|
|
{
|
|
fv.layoutChanged(X_AXIS);
|
|
fv.layoutChanged(Y_AXIS);
|
|
}
|
|
else
|
|
{
|
|
Component host = fv.getContainer();
|
|
if (host != null)
|
|
host.repaint(alloc.x, alloc.y, alloc.width, alloc.height);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Receives notification from a <code>FlowView</code> that some content
|
|
* has been removed from the document at a location that the
|
|
* <code>FlowView</code> is responsible for.
|
|
*
|
|
* The default implementation simply calls {@link #layout}.
|
|
*
|
|
* @param fv the flow view that sends the notification
|
|
* @param e the document event describing the change
|
|
* @param alloc the current allocation of the flow view
|
|
*/
|
|
public void removeUpdate(FlowView fv, DocumentEvent e, Rectangle alloc)
|
|
{
|
|
if (alloc == null)
|
|
{
|
|
fv.layoutChanged(X_AXIS);
|
|
fv.layoutChanged(Y_AXIS);
|
|
}
|
|
else
|
|
{
|
|
Component host = fv.getContainer();
|
|
if (host != null)
|
|
host.repaint(alloc.x, alloc.y, alloc.width, alloc.height);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Receives notification from a <code>FlowView</code> that some attributes
|
|
* have changed in the document at a location that the
|
|
* <code>FlowView</code> is responsible for.
|
|
*
|
|
* The default implementation simply calls {@link #layout}.
|
|
*
|
|
* @param fv the flow view that sends the notification
|
|
* @param e the document event describing the change
|
|
* @param alloc the current allocation of the flow view
|
|
*/
|
|
public void changedUpdate(FlowView fv, DocumentEvent e, Rectangle alloc)
|
|
{
|
|
if (alloc == null)
|
|
{
|
|
fv.layoutChanged(X_AXIS);
|
|
fv.layoutChanged(Y_AXIS);
|
|
}
|
|
else
|
|
{
|
|
Component host = fv.getContainer();
|
|
if (host != null)
|
|
host.repaint(alloc.x, alloc.y, alloc.width, alloc.height);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the logical view of the managed <code>FlowView</code>.
|
|
*
|
|
* @param fv the flow view for which to return the logical view
|
|
*
|
|
* @return the logical view of the managed <code>FlowView</code>
|
|
*/
|
|
protected View getLogicalView(FlowView fv)
|
|
{
|
|
return fv.layoutPool;
|
|
}
|
|
|
|
/**
|
|
* Performs the layout for the whole view. By default this rebuilds
|
|
* all the physical views from the logical views of the managed FlowView.
|
|
*
|
|
* This is called by {@link FlowView#layout} to update the layout of
|
|
* the view.
|
|
*
|
|
* @param fv the flow view for which we perform the layout
|
|
*/
|
|
public void layout(FlowView fv)
|
|
{
|
|
int start = fv.getStartOffset();
|
|
int end = fv.getEndOffset();
|
|
|
|
// Preserve the views from the logical view from beeing removed.
|
|
View lv = getLogicalView(fv);
|
|
int viewCount = lv.getViewCount();
|
|
for (int i = 0; i < viewCount; i++)
|
|
{
|
|
View v = lv.getView(i);
|
|
v.setParent(lv);
|
|
}
|
|
|
|
// Then remove all views from the flow view.
|
|
fv.removeAll();
|
|
|
|
for (int rowIndex = 0; start < end; rowIndex++)
|
|
{
|
|
View row = fv.createRow();
|
|
fv.append(row);
|
|
int next = layoutRow(fv, rowIndex, start);
|
|
if (row.getViewCount() == 0)
|
|
{
|
|
row.append(createView(fv, start, Integer.MAX_VALUE, rowIndex));
|
|
next = row.getEndOffset();
|
|
}
|
|
if (start < next)
|
|
start = next;
|
|
else
|
|
assert false: "May not happen";
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Lays out one row of the flow view. This is called by {@link #layout} to
|
|
* fill one row with child views until the available span is exhausted. The
|
|
* default implementation fills the row by calling
|
|
* {@link #createView(FlowView, int, int, int)} until the available space is
|
|
* exhausted, a forced break is encountered or there are no more views in
|
|
* the logical view. If the available space is exhausted,
|
|
* {@link #adjustRow(FlowView, int, int, int)} is called to fit the row into
|
|
* the available span.
|
|
*
|
|
* @param fv the flow view for which we perform the layout
|
|
* @param rowIndex the index of the row
|
|
* @param pos the model position for the beginning of the row
|
|
* @return the start position of the next row
|
|
*/
|
|
protected int layoutRow(FlowView fv, int rowIndex, int pos)
|
|
{
|
|
View row = fv.getView(rowIndex);
|
|
int axis = fv.getFlowAxis();
|
|
int span = fv.getFlowSpan(rowIndex);
|
|
int x = fv.getFlowStart(rowIndex);
|
|
int end = fv.getEndOffset();
|
|
|
|
// Needed for adjusting indentation in adjustRow().
|
|
int preX = x;
|
|
int availableSpan = span;
|
|
|
|
TabExpander tabExp = fv instanceof TabExpander ? (TabExpander) fv : null;
|
|
|
|
boolean forcedBreak = false;
|
|
while (pos < end && span >= 0)
|
|
{
|
|
View view = createView(fv, pos, span, rowIndex);
|
|
if (view == null
|
|
|| (span == 0 && view.getPreferredSpan(axis) > 0))
|
|
break;
|
|
|
|
int viewSpan;
|
|
if (axis == X_AXIS && view instanceof TabableView)
|
|
viewSpan = (int) ((TabableView) view).getTabbedSpan(x, tabExp);
|
|
else
|
|
viewSpan = (int) view.getPreferredSpan(axis);
|
|
|
|
// Break if the line if the view does not fit in this row or the
|
|
// line just must be broken.
|
|
int breakWeight = view.getBreakWeight(axis, pos, span);
|
|
if (breakWeight >= ForcedBreakWeight)
|
|
{
|
|
int rowViewCount = row.getViewCount();
|
|
if (rowViewCount > 0)
|
|
{
|
|
view = view.breakView(axis, pos, x, span);
|
|
if (view != null)
|
|
{
|
|
if (axis == X_AXIS && view instanceof TabableView)
|
|
viewSpan =
|
|
(int) ((TabableView) view).getTabbedSpan(x, tabExp);
|
|
else
|
|
viewSpan = (int) view.getPreferredSpan(axis);
|
|
}
|
|
else
|
|
viewSpan = 0;
|
|
}
|
|
forcedBreak = true;
|
|
}
|
|
span -= viewSpan;
|
|
x += viewSpan;
|
|
if (view != null)
|
|
{
|
|
row.append(view);
|
|
pos = view.getEndOffset();
|
|
}
|
|
if (forcedBreak)
|
|
break;
|
|
}
|
|
|
|
if (span < 0)
|
|
adjustRow(fv, rowIndex, availableSpan, preX);
|
|
else if (row.getViewCount() == 0)
|
|
{
|
|
View view = createView(fv, pos, Integer.MAX_VALUE, rowIndex);
|
|
row.append(view);
|
|
}
|
|
return row.getEndOffset();
|
|
}
|
|
|
|
/**
|
|
* Creates physical views that form the rows of the flow view. This
|
|
* can be an entire view from the logical view (if it fits within the
|
|
* available span), a fragment of such a view (if it doesn't fit in the
|
|
* available span and can be broken down) or <code>null</code> (if it does
|
|
* not fit in the available span and also cannot be broken down).
|
|
*
|
|
* The default implementation fetches the logical view at the specified
|
|
* <code>startOffset</code>. If that view has a different startOffset than
|
|
* specified in the argument, a fragment is created using
|
|
* {@link View#createFragment(int, int)} that has the correct startOffset
|
|
* and the logical view's endOffset.
|
|
*
|
|
* @param fv the flow view
|
|
* @param startOffset the start offset for the view to be created
|
|
* @param spanLeft the available span
|
|
* @param rowIndex the index of the row
|
|
*
|
|
* @return a view to fill the row with, or <code>null</code> if there
|
|
* is no view or view fragment that fits in the available span
|
|
*/
|
|
protected View createView(FlowView fv, int startOffset, int spanLeft,
|
|
int rowIndex)
|
|
{
|
|
View logicalView = getLogicalView(fv);
|
|
int index = logicalView.getViewIndex(startOffset,
|
|
Position.Bias.Forward);
|
|
View retVal = logicalView.getView(index);
|
|
if (retVal.getStartOffset() != startOffset)
|
|
retVal = retVal.createFragment(startOffset, retVal.getEndOffset());
|
|
return retVal;
|
|
}
|
|
|
|
/**
|
|
* Tries to adjust the specified row to fit within the desired span. The
|
|
* default implementation iterates through the children of the specified
|
|
* row to find the view that has the highest break weight and - if there
|
|
* is more than one view with such a break weight - which is nearest to
|
|
* the end of the row. If there is such a view that has a break weight >
|
|
* {@link View#BadBreakWeight}, this view is broken using the
|
|
* {@link View#breakView(int, int, float, float)} method and this view and
|
|
* all views after the now broken view are replaced by the broken view.
|
|
*
|
|
* @param fv the flow view
|
|
* @param rowIndex the index of the row to be adjusted
|
|
* @param desiredSpan the layout span
|
|
* @param x the X location at which the row starts
|
|
*/
|
|
protected void adjustRow(FlowView fv, int rowIndex, int desiredSpan, int x) {
|
|
// Determine the last view that has the highest break weight.
|
|
int axis = fv.getFlowAxis();
|
|
View row = fv.getView(rowIndex);
|
|
int count = row.getViewCount();
|
|
int breakIndex = -1;
|
|
int breakWeight = BadBreakWeight;
|
|
int breakSpan = 0;
|
|
int currentSpan = 0;
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
View view = row.getView(i);
|
|
int spanLeft = desiredSpan - currentSpan;
|
|
int weight = view.getBreakWeight(axis, x + currentSpan, spanLeft);
|
|
if (weight >= breakWeight && weight > BadBreakWeight)
|
|
{
|
|
breakIndex = i;
|
|
breakSpan = currentSpan;
|
|
breakWeight = weight;
|
|
if (weight >= ForcedBreakWeight)
|
|
// Don't search further.
|
|
break;
|
|
}
|
|
currentSpan += view.getPreferredSpan(axis);
|
|
}
|
|
|
|
// If there is a potential break location found, break the row at
|
|
// this location.
|
|
if (breakIndex >= 0)
|
|
{
|
|
int spanLeft = desiredSpan - breakSpan;
|
|
View toBeBroken = row.getView(breakIndex);
|
|
View brokenView = toBeBroken.breakView(axis,
|
|
toBeBroken.getStartOffset(),
|
|
x + breakSpan, spanLeft);
|
|
View lv = getLogicalView(fv);
|
|
for (int i = breakIndex; i < count; i++)
|
|
{
|
|
View tmp = row.getView(i);
|
|
if (contains(lv, tmp))
|
|
tmp.setParent(lv);
|
|
else if (tmp.getViewCount() > 0)
|
|
reparent(tmp, lv);
|
|
}
|
|
row.replace(breakIndex, count - breakIndex,
|
|
new View[]{ brokenView });
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Helper method to determine if one view contains another as child.
|
|
*/
|
|
private boolean contains(View view, View child)
|
|
{
|
|
boolean ret = false;
|
|
int n = view.getViewCount();
|
|
for (int i = 0; i < n && ret == false; i++)
|
|
{
|
|
if (view.getView(i) == child)
|
|
ret = true;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* Helper method that reparents the <code>view</code> and all of its
|
|
* decendents to the <code>parent</code> (the logical view).
|
|
*
|
|
* @param view the view to reparent
|
|
* @param parent the new parent
|
|
*/
|
|
private void reparent(View view, View parent)
|
|
{
|
|
int n = view.getViewCount();
|
|
for (int i = 0; i < n; i++)
|
|
{
|
|
View tmp = view.getView(i);
|
|
if (contains(parent, tmp))
|
|
tmp.setParent(parent);
|
|
else
|
|
reparent(tmp, parent);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This special subclass of <code>View</code> is used to represent
|
|
* the logical representation of this view. It does not support any
|
|
* visual representation, this is handled by the physical view implemented
|
|
* in the <code>FlowView</code>.
|
|
*/
|
|
class LogicalView extends CompositeView
|
|
{
|
|
/**
|
|
* Creates a new LogicalView instance.
|
|
*/
|
|
LogicalView(Element el)
|
|
{
|
|
super(el);
|
|
}
|
|
|
|
/**
|
|
* Overridden to return the attributes of the parent
|
|
* (== the FlowView instance).
|
|
*/
|
|
public AttributeSet getAttributes()
|
|
{
|
|
View p = getParent();
|
|
return p != null ? p.getAttributes() : null;
|
|
}
|
|
|
|
protected void childAllocation(int index, Rectangle a)
|
|
{
|
|
// Nothing to do here (not visual).
|
|
}
|
|
|
|
protected View getViewAtPoint(int x, int y, Rectangle r)
|
|
{
|
|
// Nothing to do here (not visual).
|
|
return null;
|
|
}
|
|
|
|
protected boolean isAfter(int x, int y, Rectangle r)
|
|
{
|
|
// Nothing to do here (not visual).
|
|
return false;
|
|
}
|
|
|
|
protected boolean isBefore(int x, int y, Rectangle r)
|
|
{
|
|
// Nothing to do here (not visual).
|
|
return false;
|
|
}
|
|
|
|
public float getPreferredSpan(int axis)
|
|
{
|
|
float max = 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)
|
|
{
|
|
max = Math.max(max, pref);
|
|
pref = 0;
|
|
}
|
|
}
|
|
max = Math.max(max, pref);
|
|
return max;
|
|
}
|
|
|
|
public float getMinimumSpan(int axis)
|
|
{
|
|
float max = 0;
|
|
float min = 0;
|
|
boolean wrap = true;
|
|
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);
|
|
wrap = false;
|
|
}
|
|
else if (! wrap)
|
|
{
|
|
max = Math.max(min, max);
|
|
wrap = true;
|
|
min = 0;
|
|
}
|
|
}
|
|
max = Math.max(max, min);
|
|
return max;
|
|
}
|
|
|
|
public void paint(Graphics g, Shape s)
|
|
{
|
|
// Nothing to do here (not visual).
|
|
}
|
|
|
|
/**
|
|
* Overridden to handle possible leaf elements.
|
|
*/
|
|
protected void loadChildren(ViewFactory f)
|
|
{
|
|
Element el = getElement();
|
|
if (el.isLeaf())
|
|
{
|
|
View v = new LabelView(el);
|
|
append(v);
|
|
}
|
|
else
|
|
super.loadChildren(f);
|
|
}
|
|
|
|
/**
|
|
* Overridden to reparent the children to this logical view, in case
|
|
* they have been parented by a row.
|
|
*/
|
|
protected void forwardUpdateToView(View v, DocumentEvent e, Shape a,
|
|
ViewFactory f)
|
|
{
|
|
v.setParent(this);
|
|
super.forwardUpdateToView(v, e, a, f);
|
|
}
|
|
|
|
/**
|
|
* Overridden to handle possible leaf element.
|
|
*/
|
|
protected int getViewIndexAtPosition(int pos)
|
|
{
|
|
int index = 0;
|
|
if (! getElement().isLeaf())
|
|
index = super.getViewIndexAtPosition(pos);
|
|
return index;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The shared instance of FlowStrategy.
|
|
*/
|
|
static final FlowStrategy sharedStrategy = new FlowStrategy();
|
|
|
|
/**
|
|
* The span of the <code>FlowView</code> that should be flowed.
|
|
*/
|
|
protected int layoutSpan;
|
|
|
|
/**
|
|
* Represents the logical child elements of this view, encapsulated within
|
|
* one parent view (an instance of a package private <code>LogicalView</code>
|
|
* class). These will be translated to a set of real views that are then
|
|
* displayed on screen. This translation is performed by the inner class
|
|
* {@link FlowStrategy}.
|
|
*/
|
|
protected View layoutPool;
|
|
|
|
/**
|
|
* The <code>FlowStrategy</code> to use for translating between the
|
|
* logical and physical view.
|
|
*/
|
|
protected FlowStrategy strategy;
|
|
|
|
/**
|
|
* Creates a new <code>FlowView</code> for the given
|
|
* <code>Element</code> and <code>axis</code>.
|
|
*
|
|
* @param element the element that is rendered by this FlowView
|
|
* @param axis the axis along which the view is tiled, either
|
|
* <code>View.X_AXIS</code> or <code>View.Y_AXIS</code>, the flow
|
|
* axis is orthogonal to this one
|
|
*/
|
|
public FlowView(Element element, int axis)
|
|
{
|
|
super(element, axis);
|
|
strategy = sharedStrategy;
|
|
layoutSpan = Short.MAX_VALUE;
|
|
}
|
|
|
|
/**
|
|
* Returns the axis along which the view should be flowed. This is
|
|
* orthogonal to the axis along which the boxes are tiled.
|
|
*
|
|
* @return the axis along which the view should be flowed
|
|
*/
|
|
public int getFlowAxis()
|
|
{
|
|
int axis = getAxis();
|
|
int flowAxis;
|
|
|
|
if (axis == X_AXIS)
|
|
flowAxis = Y_AXIS;
|
|
else
|
|
flowAxis = X_AXIS;
|
|
|
|
return flowAxis;
|
|
|
|
}
|
|
|
|
/**
|
|
* Returns the span of the flow for the specified child view. A flow
|
|
* layout can be shaped by providing different span values for different
|
|
* child indices. The default implementation returns the entire available
|
|
* span inside the view.
|
|
*
|
|
* @param index the index of the child for which to return the span
|
|
*
|
|
* @return the span of the flow for the specified child view
|
|
*/
|
|
public int getFlowSpan(int index)
|
|
{
|
|
return layoutSpan;
|
|
}
|
|
|
|
/**
|
|
* Returns the location along the flow axis where the flow span starts
|
|
* given a child view index. The flow can be shaped by providing
|
|
* different values here.
|
|
*
|
|
* @param index the index of the child for which to return the flow location
|
|
*
|
|
* @return the location along the flow axis where the flow span starts
|
|
*/
|
|
public int getFlowStart(int index)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Creates a new view that represents a row within a flow.
|
|
*
|
|
* @return a view for a new row
|
|
*/
|
|
protected abstract View createRow();
|
|
|
|
/**
|
|
* Loads the children of this view. The <code>FlowView</code> does not
|
|
* directly load its children. Instead it creates a logical view
|
|
* ({@link #layoutPool}) which is filled by the logical child views.
|
|
* The real children are created at layout time and each represent one
|
|
* row.
|
|
*
|
|
* This method is called by {@link View#setParent} in order to initialize
|
|
* the view.
|
|
*
|
|
* @param vf the view factory to use for creating the child views
|
|
*/
|
|
protected void loadChildren(ViewFactory vf)
|
|
{
|
|
if (layoutPool == null)
|
|
{
|
|
layoutPool = new LogicalView(getElement());
|
|
}
|
|
layoutPool.setParent(this);
|
|
// Initialize the flow strategy.
|
|
strategy.insertUpdate(this, null, null);
|
|
}
|
|
|
|
/**
|
|
* Performs the layout of this view. If the span along the flow axis changed,
|
|
* this first calls {@link FlowStrategy#layout} in order to rebuild the
|
|
* rows of this view. Then the superclass's behaviour is called to arrange
|
|
* the rows within the box.
|
|
*
|
|
* @param width the width of the view
|
|
* @param height the height of the view
|
|
*/
|
|
protected void layout(int width, int height)
|
|
{
|
|
int flowAxis = getFlowAxis();
|
|
int span;
|
|
if (flowAxis == X_AXIS)
|
|
span = (int) width;
|
|
else
|
|
span = (int) height;
|
|
|
|
if (layoutSpan != span)
|
|
{
|
|
layoutChanged(flowAxis);
|
|
layoutChanged(getAxis());
|
|
layoutSpan = span;
|
|
}
|
|
|
|
if (! isLayoutValid(flowAxis))
|
|
{
|
|
int axis = getAxis();
|
|
int oldSpan = axis == X_AXIS ? getWidth() : getHeight();
|
|
strategy.layout(this);
|
|
int newSpan = (int) getPreferredSpan(axis);
|
|
if (oldSpan != newSpan)
|
|
{
|
|
View parent = getParent();
|
|
if (parent != null)
|
|
parent.preferenceChanged(this, axis == X_AXIS, axis == Y_AXIS);
|
|
}
|
|
}
|
|
|
|
super.layout(width, height);
|
|
}
|
|
|
|
/**
|
|
* Receice notification that some content has been inserted in the region
|
|
* that this view is responsible for. This calls
|
|
* {@link FlowStrategy#insertUpdate}.
|
|
*
|
|
* @param changes the document event describing the changes
|
|
* @param a the current allocation of the view
|
|
* @param vf the view factory that is used for creating new child views
|
|
*/
|
|
public void insertUpdate(DocumentEvent changes, Shape a, ViewFactory vf)
|
|
{
|
|
// First we must send the insertUpdate to the logical view so it can
|
|
// be updated accordingly.
|
|
layoutPool.insertUpdate(changes, a, vf);
|
|
strategy.insertUpdate(this, changes, getInsideAllocation(a));
|
|
}
|
|
|
|
/**
|
|
* Receice notification that some content has been removed from the region
|
|
* that this view is responsible for. This calls
|
|
* {@link FlowStrategy#removeUpdate}.
|
|
*
|
|
* @param changes the document event describing the changes
|
|
* @param a the current allocation of the view
|
|
* @param vf the view factory that is used for creating new child views
|
|
*/
|
|
public void removeUpdate(DocumentEvent changes, Shape a, ViewFactory vf)
|
|
{
|
|
layoutPool.removeUpdate(changes, a, vf);
|
|
strategy.removeUpdate(this, changes, getInsideAllocation(a));
|
|
}
|
|
|
|
/**
|
|
* Receice notification that some attributes changed in the region
|
|
* that this view is responsible for. This calls
|
|
* {@link FlowStrategy#changedUpdate}.
|
|
*
|
|
* @param changes the document event describing the changes
|
|
* @param a the current allocation of the view
|
|
* @param vf the view factory that is used for creating new child views
|
|
*/
|
|
public void changedUpdate(DocumentEvent changes, Shape a, ViewFactory vf)
|
|
{
|
|
layoutPool.changedUpdate(changes, a, vf);
|
|
strategy.changedUpdate(this, changes, getInsideAllocation(a));
|
|
}
|
|
|
|
/**
|
|
* Returns the index of the child <code>View</code> for the given model
|
|
* position.
|
|
*
|
|
* This is implemented to iterate over the children of this
|
|
* view (the rows) and return the index of the first view that contains
|
|
* the given position.
|
|
*
|
|
* @param pos the model position for whicht the child <code>View</code> is
|
|
* queried
|
|
*
|
|
* @return the index of the child <code>View</code> for the given model
|
|
* position
|
|
*/
|
|
protected int getViewIndexAtPosition(int pos)
|
|
{
|
|
// First make sure we have a valid layout.
|
|
if (!isAllocationValid())
|
|
layout(getWidth(), getHeight());
|
|
|
|
int count = getViewCount();
|
|
int result = -1;
|
|
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
View child = getView(i);
|
|
int start = child.getStartOffset();
|
|
int end = child.getEndOffset();
|
|
if (start <= pos && end > pos)
|
|
{
|
|
result = i;
|
|
break;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Calculates the size requirements of this <code>BoxView</code> along
|
|
* its minor axis, that is the axis opposite to the axis specified in the
|
|
* constructor.
|
|
*
|
|
* This is overridden and forwards the request to the logical view.
|
|
*
|
|
* @param axis the axis that is examined
|
|
* @param r the <code>SizeRequirements</code> object to hold the result,
|
|
* if <code>null</code>, a new one is created
|
|
*
|
|
* @return the size requirements for this <code>BoxView</code> along
|
|
* the specified axis
|
|
*/
|
|
protected SizeRequirements calculateMinorAxisRequirements(int axis,
|
|
SizeRequirements r)
|
|
{
|
|
SizeRequirements res = r;
|
|
if (res == null)
|
|
res = new SizeRequirements();
|
|
res.minimum = (int) layoutPool.getMinimumSpan(axis);
|
|
res.preferred = Math.max(res.minimum,
|
|
(int) layoutPool.getPreferredSpan(axis));
|
|
res.maximum = Integer.MAX_VALUE;
|
|
res.alignment = 0.5F;
|
|
return res;
|
|
}
|
|
}
|