File	Doc	Category	Size	Date	Package
BoxView.java	API Doc	Java SE 5 API	40685	Fri Aug 26 14:58:14 BST 2005	javax.swing.text

BoxView

• java.lang.Object
  • javax.swing.text.View
    • javax.swing.text.CompositeView

Fields Summary
int	majorAxis
int	majorSpan
int	minorSpan
boolean	majorReqValid
boolean	minorReqValid
SizeRequirements	majorRequest
SizeRequirements	minorRequest
boolean	majorAllocValid
int[]	majorOffsets
int[]	majorSpans
boolean	minorAllocValid
int[]	minorOffsets
int[]	minorSpans
Rectangle	tempRect used in paint.

Constructors Summary

public BoxView(Element elem, int axis) Constructs a BoxView. param elem the element this view is responsible for param axis either View.X_AXIS or View.Y_AXIS super(elem); tempRect = new Rectangle(); this.majorAxis = axis; majorOffsets = new int[0]; majorSpans = new int[0]; majorReqValid = false; majorAllocValid = false; minorOffsets = new int[0]; minorSpans = new int[0]; minorReqValid = false; minorAllocValid = false;

Methods Summary
protected void	baselineLayout(int targetSpan, int axis, int[] offsets, int[] spans) Computes the location and extent of each child view in this BoxView given the targetSpan, which is the width (or height) of the region we have to work with. param targetSpan the total span given to the view, which would be used to layout the children param axis the axis being studied, either View.X_AXIS or View.Y_AXIS param offsets an empty array filled by this method with values specifying the location of each child view param spans an empty array filled by this method with values specifying the extent of each child view int totalAscent = (int)(targetSpan * getAlignment(axis)); int totalDescent = targetSpan - totalAscent; int n = getViewCount(); for (int i = 0; i < n; i++) { View v = getView(i); float align = v.getAlignment(axis); int viewSpan; if (v.getResizeWeight(axis) > 0) { // if resizable then resize to the best fit // the smallest span possible int minSpan = (int)v.getMinimumSpan(axis); // the largest span possible int maxSpan = (int)v.getMaximumSpan(axis); if (align == 0.0f) { // if the alignment is 0 then we need to fit into the descent viewSpan = Math.max(Math.min(maxSpan, totalDescent), minSpan); } else if (align == 1.0f) { // if the alignment is 1 then we need to fit into the ascent viewSpan = Math.max(Math.min(maxSpan, totalAscent), minSpan); } else { // figure out the span that we must fit into int fitSpan = (int)Math.min(totalAscent / align, totalDescent / (1.0f - align)); // fit into the calculated span viewSpan = Math.max(Math.min(maxSpan, fitSpan), minSpan); } } else { // otherwise use the preferred spans viewSpan = (int)v.getPreferredSpan(axis); } offsets[i] = totalAscent - (int)(viewSpan * align); spans[i] = viewSpan; }
protected javax.swing.SizeRequirements	baselineRequirements(int axis, javax.swing.SizeRequirements r) Calculates the size requirements for this BoxView by examining the size of each child view. param axis the axis being studied param r the SizeRequirements object; if null one will be created return the newly initialized SizeRequirements object SizeRequirements totalAscent = new SizeRequirements(); SizeRequirements totalDescent = new SizeRequirements(); if (r == null) { r = new SizeRequirements(); } r.alignment = 0.5f; int n = getViewCount(); // loop through all children calculating the max of all their ascents and // descents at minimum, preferred, and maximum sizes for (int i = 0; i < n; i++) { View v = getView(i); float align = v.getAlignment(axis); int span; int ascent; int descent; // find the maximum of the preferred ascents and descents span = (int)v.getPreferredSpan(axis); ascent = (int)(align * span); descent = span - ascent; totalAscent.preferred = Math.max(ascent, totalAscent.preferred); totalDescent.preferred = Math.max(descent, totalDescent.preferred); if (v.getResizeWeight(axis) > 0) { // if the view is resizable then do the same for the minimum and // maximum ascents and descents span = (int)v.getMinimumSpan(axis); ascent = (int)(align * span); descent = span - ascent; totalAscent.minimum = Math.max(ascent, totalAscent.minimum); totalDescent.minimum = Math.max(descent, totalDescent.minimum); span = (int)v.getMaximumSpan(axis); ascent = (int)(align * span); descent = span - ascent; totalAscent.maximum = Math.max(ascent, totalAscent.maximum); totalDescent.maximum = Math.max(descent, totalDescent.maximum); } else { // otherwise use the preferred totalAscent.minimum = Math.max(ascent, totalAscent.minimum); totalDescent.minimum = Math.max(descent, totalDescent.minimum); totalAscent.maximum = Math.max(ascent, totalAscent.maximum); totalDescent.maximum = Math.max(descent, totalDescent.maximum); } } // we now have an overall preferred, minimum, and maximum ascent and descent // calculate the preferred span as the sum of the preferred ascent and preferred descent r.preferred = (int)Math.min((long)totalAscent.preferred + (long)totalDescent.preferred, Integer.MAX_VALUE); // calculate the preferred alignment as the preferred ascent divided by the preferred span if (r.preferred > 0) { r.alignment = (float)totalAscent.preferred / r.preferred; } if (r.alignment == 0.0f) { // if the preferred alignment is 0 then the minimum and maximum spans are simply // the minimum and maximum descents since there's nothing above the baseline r.minimum = totalDescent.minimum; r.maximum = totalDescent.maximum; } else if (r.alignment == 1.0f) { // if the preferred alignment is 1 then the minimum and maximum spans are simply // the minimum and maximum ascents since there's nothing below the baseline r.minimum = totalAscent.minimum; r.maximum = totalAscent.maximum; } else { // we want to honor the preferred alignment so we calculate two possible minimum // span values using 1) the minimum ascent and the alignment, and 2) the minimum // descent and the alignment. We'll choose the larger of these two numbers. r.minimum = Math.max((int)(totalAscent.minimum / r.alignment), (int)(totalDescent.minimum / (1.0f - r.alignment))); // a similar calculation is made for the maximum but we choose the smaller number. r.maximum = Math.min((int)(totalAscent.maximum / r.alignment), (int)(totalDescent.maximum / (1.0f - r.alignment))); } return r;
protected javax.swing.SizeRequirements	calculateMajorAxisRequirements(int axis, javax.swing.SizeRequirements r) Calculates the size requirements for the major axis axis. param axis the axis being studied param r the SizeRequirements object; if null one will be created return the newly initialized SizeRequirements object see javax.swing.SizeRequirements // calculate tiled request float min = 0; float pref = 0; float max = 0; int n = getViewCount(); for (int i = 0; i < n; i++) { View v = getView(i); min += v.getMinimumSpan(axis); pref += v.getPreferredSpan(axis); max += v.getMaximumSpan(axis); } if (r == null) { r = new SizeRequirements(); } r.alignment = 0.5f; r.minimum = (int) min; r.preferred = (int) pref; r.maximum = (int) max; return r;
protected javax.swing.SizeRequirements	calculateMinorAxisRequirements(int axis, javax.swing.SizeRequirements r) Calculates the size requirements for the minor axis axis. param axis the axis being studied param r the SizeRequirements object; if null one will be created return the newly initialized SizeRequirements object see javax.swing.SizeRequirements int min = 0; long pref = 0; int max = Integer.MAX_VALUE; int n = getViewCount(); for (int i = 0; i < n; i++) { View v = getView(i); min = Math.max((int) v.getMinimumSpan(axis), min); pref = Math.max((int) v.getPreferredSpan(axis), pref); max = Math.max((int) v.getMaximumSpan(axis), max); } if (r == null) { r = new SizeRequirements(); r.alignment = 0.5f; } r.preferred = (int) pref; r.minimum = min; r.maximum = max; return r;
void	checkRequests(int axis) Checks the request cache and update if needed. param axis the axis being studied exception IllegalArgumentException if axis is neither View.X_AXIS nor View.Y_AXIS if ((axis != X_AXIS) && (axis != Y_AXIS)) { throw new IllegalArgumentException("Invalid axis: " + axis); } if (axis == majorAxis) { if (!majorReqValid) { majorRequest = calculateMajorAxisRequirements(axis, majorRequest); majorReqValid = true; } } else if (! minorReqValid) { minorRequest = calculateMinorAxisRequirements(axis, minorRequest); minorReqValid = true; }
protected void	childAllocation(int index, java.awt.Rectangle alloc) Allocates a region for a child view. param index the index of the child view to allocate, >= 0 && < getViewCount() param alloc the allocated region alloc.x += getOffset(X_AXIS, index); alloc.y += getOffset(Y_AXIS, index); alloc.width = getSpan(X_AXIS, index); alloc.height = getSpan(Y_AXIS, index);
protected boolean	flipEastAndWestAtEnds(int position, javax.swing.text.Position$Bias bias) Determines in which direction the next view lays. Consider the View at index n. Typically the Views are layed out from left to right, so that the View to the EAST will be at index n + 1, and the View to the WEST will be at index n - 1. In certain situations, such as with bidirectional text, it is possible that the View to EAST is not at index n + 1, but rather at index n - 1, or that the View to the WEST is not at index n - 1, but index n + 1. In this case this method would return true, indicating the Views are layed out in descending order. Otherwise the method would return false indicating the Views are layed out in ascending order. If the receiver is laying its Views along the Y_AXIS, this will will return the value from invoking the same method on the View responsible for rendering position and bias. Otherwise this will return false. param position position into the model param bias either Position.Bias.Forward or Position.Bias.Backward return true if the Views surrounding the View responding for rendering position and bias are layed out in descending order; otherwise false if(majorAxis == Y_AXIS) { int testPos = (bias == Position.Bias.Backward) ? Math.max(0, position - 1) : position; int index = getViewIndexAtPosition(testPos); if(index != -1) { View v = getView(index); if(v != null && v instanceof CompositeView) { return ((CompositeView)v).flipEastAndWestAtEnds(position, bias); } } } return false;
protected void	forwardUpdate(javax.swing.event.DocumentEvent$ElementChange ec, javax.swing.event.DocumentEvent e, java.awt.Shape a, javax.swing.text.ViewFactory f) Forwards the given DocumentEvent to the child views that need to be notified of the change to the model. If a child changed its requirements and the allocation was valid prior to forwarding the portion of the box from the starting child to the end of the box will be repainted. param ec changes to the element this view is responsible for (may be null if there were no changes) 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 #insertUpdate see #removeUpdate see #changedUpdate boolean wasValid = isLayoutValid(majorAxis); super.forwardUpdate(ec, e, a, f); // determine if a repaint is needed if (wasValid && (! isLayoutValid(majorAxis))) { // Repaint is needed because one of the tiled children // have changed their span along the major axis. If there // is a hosting component and an allocated shape we repaint. Component c = getContainer(); if ((a != null) && (c != null)) { int pos = e.getOffset(); int index = getViewIndexAtPosition(pos); Rectangle alloc = getInsideAllocation(a); if (majorAxis == X_AXIS) { alloc.x += majorOffsets[index]; alloc.width -= majorOffsets[index]; } else { alloc.y += minorOffsets[index]; alloc.height -= minorOffsets[index]; } c.repaint(alloc.x, alloc.y, alloc.width, alloc.height); } }
public float	getAlignment(int axis) Determines the desired alignment for this view along an axis. This is implemented to give the total alignment needed to position the children with the alignment points lined up along the axis orthoginal to the axis that is being tiled. The axis being tiled will request to be centered (i.e. 0.5f). param axis may be either View.X_AXIS or View.Y_AXIS return the desired alignment >= 0.0f && <= 1.0f; this should be a value between 0.0 and 1.0 where 0 indicates alignment at the origin and 1.0 indicates alignment to the full span away from the origin; an alignment of 0.5 would be the center of the view exception IllegalArgumentException for an invalid axis checkRequests(axis); if (axis == majorAxis) { return majorRequest.alignment; } else { return minorRequest.alignment; }
public int	getAxis() Fetches the tile axis property. This is the axis along which the child views are tiled. return the major axis of the box, either View.X_AXIS or View.Y_AXIS since 1.3 return majorAxis;
public java.awt.Shape	getChildAllocation(int index, java.awt.Shape a) Fetches the allocation for the given child view. This enables finding out where various views are located. This is implemented to return null if the layout is invalid, otherwise the superclass behavior is executed. param index the index of the child, >= 0 && < getViewCount() param a the allocation to this view return the allocation to the child; or null if a is null; or null if the layout is invalid if (a != null) { Shape ca = super.getChildAllocation(index, a); if ((ca != null) && (! isAllocationValid())) { // The child allocation may not have been set yet. Rectangle r = (ca instanceof Rectangle) ? (Rectangle) ca : ca.getBounds(); if ((r.width == 0) && (r.height == 0)) { return null; } } return ca; } return null;
public int	getHeight() Returns the current height of the box. This is the height that it was last allocated. return the current height of the box int span; if (majorAxis == Y_AXIS) { span = majorSpan; } else { span = minorSpan; } span += getTopInset() - getBottomInset(); return span;
public float	getMaximumSpan(int axis) Determines the maximum 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 >= 0; 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 exception IllegalArgumentException for an invalid axis type checkRequests(axis); float marginSpan = (axis == X_AXIS) ? getLeftInset() + getRightInset() : getTopInset() + getBottomInset(); if (axis == majorAxis) { return ((float)majorRequest.maximum) + marginSpan; } else { return ((float)minorRequest.maximum) + marginSpan; }
public float	getMinimumSpan(int axis) Determines the minimum 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 >= 0; 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 exception IllegalArgumentException for an invalid axis type checkRequests(axis); float marginSpan = (axis == X_AXIS) ? getLeftInset() + getRightInset() : getTopInset() + getBottomInset(); if (axis == majorAxis) { return ((float)majorRequest.minimum) + marginSpan; } else { return ((float)minorRequest.minimum) + marginSpan; }
protected int	getOffset(int axis, int childIndex) Fetches the offset of a particular child's current layout. param axis the axis being studied param childIndex the index of the requested child return the offset (location) for the specified child int[] offsets = (axis == majorAxis) ? majorOffsets : minorOffsets; return offsets[childIndex];
public float	getPreferredSpan(int axis) 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 >= 0; 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 exception IllegalArgumentException for an invalid axis type checkRequests(axis); float marginSpan = (axis == X_AXIS) ? getLeftInset() + getRightInset() : getTopInset() + getBottomInset(); if (axis == majorAxis) { return ((float)majorRequest.preferred) + marginSpan; } else { return ((float)minorRequest.preferred) + marginSpan; }
public int	getResizeWeight(int axis) Gets the resize weight. A value of 0 or less is not resizable. param axis may be either View.X_AXIS or View.Y_AXIS return the weight exception IllegalArgumentException for an invalid axis checkRequests(axis); if (axis == majorAxis) { if ((majorRequest.preferred != majorRequest.minimum) || (majorRequest.preferred != majorRequest.maximum)) { return 1; } } else { if ((minorRequest.preferred != minorRequest.minimum) || (minorRequest.preferred != minorRequest.maximum)) { return 1; } } return 0;
protected int	getSpan(int axis, int childIndex) Fetches the span of a particular childs current layout. param axis the axis being studied param childIndex the index of the requested child return the span (width or height) of the specified child int[] spans = (axis == majorAxis) ? majorSpans : minorSpans; return spans[childIndex];
float	getSpanOnAxis(int axis) Returns the size of the view along an axis. This is implemented to return zero. param axis may be either View.X_AXIS or View.Y_AXIS return the current span of the view along the given axis, >= 0 if (axis == majorAxis) { return majorSpan; } else { return minorSpan; }
protected javax.swing.text.View	getViewAtPoint(int x, int y, java.awt.Rectangle alloc) Fetches the child view at the given coordinates. param x the X coordinate >= 0 param y the Y coordinate >= 0 param alloc the parents inner allocation on entry, which should be changed to the childs allocation on exit return the view int n = getViewCount(); if (majorAxis == View.X_AXIS) { if (x < (alloc.x + majorOffsets[0])) { childAllocation(0, alloc); return getView(0); } for (int i = 0; i < n; i++) { if (x < (alloc.x + majorOffsets[i])) { childAllocation(i - 1, alloc); return getView(i - 1); } } childAllocation(n - 1, alloc); return getView(n - 1); } else { if (y < (alloc.y + majorOffsets[0])) { childAllocation(0, alloc); return getView(0); } for (int i = 0; i < n; i++) { if (y < (alloc.y + majorOffsets[i])) { childAllocation(i - 1, alloc); return getView(i - 1); } } childAllocation(n - 1, alloc); return getView(n - 1); }
public int	getWidth() Returns the current width of the box. This is the width that it was last allocated. return the current width of the box int span; if (majorAxis == X_AXIS) { span = majorSpan; } else { span = minorSpan; } span += getLeftInset() - getRightInset(); return span;
protected boolean	isAfter(int x, int y, java.awt.Rectangle innerAlloc) Determines if a point falls after an allocated region. param x the X coordinate >= 0 param y the Y coordinate >= 0 param innerAlloc the allocated region; this is the area inside of the insets return true if the point lies after the region else false if (majorAxis == View.X_AXIS) { return (x > (innerAlloc.width + innerAlloc.x)); } else { return (y > (innerAlloc.height + innerAlloc.y)); }
protected boolean	isAllocationValid() Are the allocations for the children still valid? return true if allocations still valid return (majorAllocValid && minorAllocValid);
protected boolean	isBefore(int x, int y, java.awt.Rectangle innerAlloc) Determines if a point falls before an allocated region. param x the X coordinate >= 0 param y the Y coordinate >= 0 param innerAlloc the allocated region; this is the area inside of the insets return true if the point lies before the region else false if (majorAxis == View.X_AXIS) { return (x < innerAlloc.x); } else { return (y < innerAlloc.y); }
protected boolean	isLayoutValid(int axis) Determines if the layout is valid along the given axis. param axis either View.X_AXIS or View.Y_AXIS since 1.4 if (axis == majorAxis) { return majorAllocValid; } else { return minorAllocValid; }
protected void	layout(int width, int height) Perform layout on the box param width the width (inside of the insets) >= 0 param height the height (inside of the insets) >= 0 setSpanOnAxis(X_AXIS, width); setSpanOnAxis(Y_AXIS, height);
public void	layoutChanged(int axis) Invalidates the layout along an axis. This happens automatically if the preferences have changed for any of the child views. In some cases the layout may need to be recalculated when the preferences have not changed. The layout can be marked as invalid by calling this method. The layout will be updated the next time the setSize method is called on this view (typically in paint). param axis either View.X_AXIS or View.Y_AXIS since 1.3 if (axis == majorAxis) { majorAllocValid = false; } else { minorAllocValid = false; }
protected void	layoutMajorAxis(int targetSpan, int axis, int[] offsets, int[] spans) Performs layout for the major axis of the box (i.e. the axis that it represents). The results of the layout should be placed in the given arrays which represent the allocations to the children along the major axis. param targetSpan the total span given to the view, which would be used to layout the children param axis the axis being layed out param offsets the offsets from the origin of the view for each of the child views; this is a return value and is filled in by the implementation of this method param spans the span of each child view; this is a return value and is filled in by the implementation of this method return the offset and span for each child view in the offsets and spans parameters /* * first pass, calculate the preferred sizes * and the flexibility to adjust the sizes. */ long preferred = 0; int n = getViewCount(); for (int i = 0; i < n; i++) { View v = getView(i); spans[i] = (int) v.getPreferredSpan(axis); preferred += spans[i]; } /* * Second pass, expand or contract by as much as possible to reach * the target span. */ // determine the adjustment to be made long desiredAdjustment = targetSpan - preferred; float adjustmentFactor = 0.0f; int[] diffs = null; if (desiredAdjustment != 0) { long totalSpan = 0; diffs = new int[n]; for (int i = 0; i < n; i++) { View v = getView(i); int tmp; if (desiredAdjustment < 0) { tmp = (int)v.getMinimumSpan(axis); diffs[i] = spans[i] - tmp; } else { tmp = (int)v.getMaximumSpan(axis); diffs[i] = tmp - spans[i]; } totalSpan += tmp; } float maximumAdjustment = Math.abs(totalSpan - preferred); adjustmentFactor = desiredAdjustment / maximumAdjustment; adjustmentFactor = Math.min(adjustmentFactor, 1.0f); adjustmentFactor = Math.max(adjustmentFactor, -1.0f); } // make the adjustments int totalOffset = 0; for (int i = 0; i < n; i++) { offsets[i] = totalOffset; if (desiredAdjustment != 0) { float adjF = adjustmentFactor * diffs[i]; spans[i] += Math.round(adjF); } totalOffset = (int) Math.min((long) totalOffset + (long) spans[i], Integer.MAX_VALUE); }
protected void	layoutMinorAxis(int targetSpan, int axis, int[] offsets, int[] spans) Performs layout for the minor axis of the box (i.e. the axis orthoginal to the axis that it represents). The results of the layout should be placed in the given arrays which represent the allocations to the children along the minor axis. param targetSpan the total span given to the view, which would be used to layout the children param axis the axis being layed out param offsets the offsets from the origin of the view for each of the child views; this is a return value and is filled in by the implementation of this method param spans the span of each child view; this is a return value and is filled in by the implementation of this method return the offset and span for each child view in the offsets and spans parameters int n = getViewCount(); for (int i = 0; i < n; i++) { View v = getView(i); int max = (int) v.getMaximumSpan(axis); if (max < targetSpan) { // can't make the child this wide, align it float align = v.getAlignment(axis); offsets[i] = (int) ((targetSpan - max) * align); spans[i] = max; } else { // make it the target width, or as small as it can get. int min = (int)v.getMinimumSpan(axis); offsets[i] = 0; spans[i] = Math.max(min, targetSpan); } }
public java.awt.Shape	modelToView(int pos, java.awt.Shape a, javax.swing.text.Position$Bias b) Provides a mapping from the document model coordinate space to the coordinate space of the view mapped to it. This makes sure the allocation is valid before calling the superclass. param pos the position to convert >= 0 param a the allocated region to render into return the bounding box of the given position exception BadLocationException if the given position does not represent a valid location in the associated document see View#modelToView if (! isAllocationValid()) { Rectangle alloc = a.getBounds(); setSize(alloc.width, alloc.height); } return super.modelToView(pos, a, b);
public void	paint(java.awt.Graphics g, java.awt.Shape allocation) Renders the BoxView using the given rendering surface and area on that surface. Only the children that intersect the clip bounds of the given Graphics will be rendered. param g the rendering surface to use param allocation the allocated region to render into see View#paint Rectangle alloc = (allocation instanceof Rectangle) ? (Rectangle)allocation : allocation.getBounds(); int n = getViewCount(); int x = alloc.x + getLeftInset(); int y = alloc.y + getTopInset(); Rectangle clip = g.getClipBounds(); for (int i = 0; i < n; i++) { tempRect.x = x + getOffset(X_AXIS, i); tempRect.y = y + getOffset(Y_AXIS, i); tempRect.width = getSpan(X_AXIS, i); tempRect.height = getSpan(Y_AXIS, i); if (tempRect.intersects(clip)) { paintChild(g, tempRect, i); } }
protected void	paintChild(java.awt.Graphics g, java.awt.Rectangle alloc, int index) Paints a child. By default that is all it does, but a subclass can use this to paint things relative to the child. param g the graphics context param alloc the allocated region to paint into param index the child index, >= 0 && < getViewCount() View child = getView(index); child.paint(g, alloc);
public void	preferenceChanged(javax.swing.text.View child, boolean width, boolean height) This is called by a child to indicate its preferred span has changed. This is implemented to throw away cached layout information so that new calculations will be done the next time the children need an allocation. param child the child view param width true if the width preference should change param height true if the height preference should change boolean majorChanged = (majorAxis == X_AXIS) ? width : height; boolean minorChanged = (majorAxis == X_AXIS) ? height : width; if (majorChanged) { majorReqValid = false; majorAllocValid = false; } if (minorChanged) { minorReqValid = false; minorAllocValid = false; } super.preferenceChanged(child, width, height);
public void	replace(int index, int length, javax.swing.text.View[] elems) Invalidates the layout and resizes the cache of requests/allocations. The child allocations can still be accessed for the old layout, but the new children will have an offset and span of 0. param index the starting index into the child views to insert the new views; this should be a value >= 0 and <= getViewCount param length the number of existing child views to remove; This should be a value >= 0 and <= (getViewCount() - offset) param elems the child views to add; this value can be nullto indicate no children are being added (useful to remove) super.replace(index, length, elems); // invalidate cache int nInserted = (elems != null) ? elems.length : 0; majorOffsets = updateLayoutArray(majorOffsets, index, nInserted); majorSpans = updateLayoutArray(majorSpans, index, nInserted); majorReqValid = false; majorAllocValid = false; minorOffsets = updateLayoutArray(minorOffsets, index, nInserted); minorSpans = updateLayoutArray(minorSpans, index, nInserted); minorReqValid = false; minorAllocValid = false;
public void	setAxis(int axis) Sets the tile axis property. This is the axis along which the child views are tiled. param axis either View.X_AXIS or View.Y_AXIS since 1.3 boolean axisChanged = (axis != majorAxis); majorAxis = axis; if (axisChanged) { preferenceChanged(null, true, true); }
public void	setSize(float width, float height) Sets the size of the view. This should cause layout of the view if the view caches any layout information. This is implemented to call the layout method with the sizes inside of the insets. param width the width >= 0 param height the height >= 0 layout((int)(width - getLeftInset() - getRightInset()), (int)(height - getTopInset() - getBottomInset()));
void	setSpanOnAxis(int axis, float span) Sets the size of the view along an axis. This should cause layout of the view along the given axis. param axis may be either View.X_AXIS or View.Y_AXIS param span the span to layout to >= 0 if (axis == majorAxis) { if (majorSpan != (int) span) { majorAllocValid = false; } if (! majorAllocValid) { // layout the major axis majorSpan = (int) span; checkRequests(majorAxis); layoutMajorAxis(majorSpan, axis, majorOffsets, majorSpans); majorAllocValid = true; // flush changes to the children updateChildSizes(); } } else { if (((int) span) != minorSpan) { minorAllocValid = false; } if (! minorAllocValid) { // layout the minor axis minorSpan = (int) span; checkRequests(axis); layoutMinorAxis(minorSpan, axis, minorOffsets, minorSpans); minorAllocValid = true; // flush changes to the children updateChildSizes(); } }
void	updateChildSizes() Propagates the current allocations to the child views. int n = getViewCount(); if (majorAxis == X_AXIS) { for (int i = 0; i < n; i++) { View v = getView(i); v.setSize((float) majorSpans[i], (float) minorSpans[i]); } } else { for (int i = 0; i < n; i++) { View v = getView(i); v.setSize((float) minorSpans[i], (float) majorSpans[i]); } }
int[]	updateLayoutArray(int[] oldArray, int offset, int nInserted) Resizes the given layout array to match the new number of child views. The current number of child views are used to produce the new array. The contents of the old array are inserted into the new array at the appropriate places so that the old layout information is transferred to the new array. param oldArray the original layout array param offset location where new views will be inserted param nInserted the number of child views being inserted; therefore the number of blank spaces to leave in the new array at location offset return the new layout array int n = getViewCount(); int[] newArray = new int[n]; System.arraycopy(oldArray, 0, newArray, 0, offset); System.arraycopy(oldArray, offset, newArray, offset + nInserted, n - nInserted - offset); return newArray;
public int	viewToModel(float x, float y, java.awt.Shape a, javax.swing.text.Position$Bias[] bias) Provides a mapping from the view coordinate space to the logical coordinate space of the model. param x x coordinate of the view location to convert >= 0 param y y coordinate of the view location to convert >= 0 param a the allocated region to render into return the location within the model that best represents the given point in the view >= 0 see View#viewToModel if (! isAllocationValid()) { Rectangle alloc = a.getBounds(); setSize(alloc.width, alloc.height); } return super.viewToModel(x, y, a, bias);