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import java.awt.Rectangle; |
import java.awt.Rectangle; |
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import java.awt.Shape; |
import java.awt.Shape; |
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|
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// TODO: Implement this class. |
import javax.swing.SizeRequirements; |
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|
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/** |
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* An implementation of {@link CompositeView} that arranges its children in |
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* a box along one axis. This is comparable to how the <code>BoxLayout</code> |
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* works, but for <code>View</code> children. |
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* |
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* @author Roman Kennke (roman@kennke.org) |
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*/ |
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public class BoxView |
public class BoxView |
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extends CompositeView |
extends CompositeView |
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{ |
{ |
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|
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/** |
/** |
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* The axis along which this <code>BoxView</code> is laid out. |
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*/ |
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int myAxis; |
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|
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/** |
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* Indicates wether the layout in X_AXIS is valid. |
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*/ |
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boolean xLayoutValid; |
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|
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/** |
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* Indicates whether the layout in Y_AXIS is valid. |
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*/ |
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boolean yLayoutValid; |
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|
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/** |
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* The spans in X direction of the children. |
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*/ |
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int[] spansX; |
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|
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/** |
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* The spans in Y direction of the children. |
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*/ |
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int[] spansY; |
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|
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/** |
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* The offsets of the children in X direction relative to this BoxView's |
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* inner bounds. |
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*/ |
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int[] offsetsX; |
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|
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/** |
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* The offsets of the children in Y direction relative to this BoxView's |
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* inner bounds. |
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*/ |
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int[] offsetsY; |
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|
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/** |
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* The current width. |
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*/ |
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int width; |
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|
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/** |
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* The current height. |
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*/ |
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int height; |
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|
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/** |
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* Creates a new <code>BoxView</code> for the given |
* Creates a new <code>BoxView</code> for the given |
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* <code>Element</code>. |
* <code>Element</code> and axis. Valid values for the axis are |
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* {@link View#X_AXIS} and {@link View#Y_AXIS}. |
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* |
* |
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* @param element the element that is rendered by this BoxView |
* @param element the element that is rendered by this BoxView |
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* @param axis the axis along which the box is laid out |
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*/ |
*/ |
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public BoxView(Element element) |
public BoxView(Element element, int axis) |
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{ |
{ |
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super(element); |
super(element); |
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myAxis = axis; |
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xLayoutValid = false; |
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yLayoutValid = false; |
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|
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// Initialize the cache arrays. |
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spansX = new int[0]; |
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spansY = new int[0]; |
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offsetsX = new int[0]; |
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offsetsY = new int[0]; |
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|
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width = 0; |
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height = 0; |
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} |
} |
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|
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/** |
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* Returns the axis along which this <code>BoxView</code> is laid out. |
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* |
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* @return the axis along which this <code>BoxView</code> is laid out |
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*/ |
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public int getAxis() |
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{ |
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return myAxis; |
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} |
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|
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/** |
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* Sets the axis along which this <code>BoxView</code> is laid out. |
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* |
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* Valid values for the axis are {@link View#X_AXIS} and |
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* {@link View#Y_AXIS}. |
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* |
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* @param axis the axis along which this <code>BoxView</code> is laid out |
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*/ |
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public void setAxis(int axis) |
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{ |
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myAxis = axis; |
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} |
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/** |
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* Marks the layout along the specified axis as invalid. This is triggered |
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* automatically when any of the child view changes its preferences |
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* via {@link #preferenceChanged(View, boolean, boolean)}. |
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* |
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* The layout will be updated the next time when {@link #setSize()} is |
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* called, typically from within the {@link #paint()} method. |
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* |
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* Valid values for the axis are {@link View#X_AXIS} and |
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* {@link View#Y_AXIS}. |
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* |
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* @param axis an <code>int</code> value |
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*/ |
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public void layoutChanged(int axis) |
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{ |
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switch (axis) |
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{ |
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case X_AXIS: |
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xLayoutValid = false; |
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break; |
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case Y_AXIS: |
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yLayoutValid = false; |
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break; |
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default: |
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throw new IllegalArgumentException("Invalid axis parameter."); |
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} |
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} |
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/** |
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* Returns <code>true</code> if the layout along the specified |
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* <code>axis</code> is valid, <code>false</code> otherwise. |
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* |
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* Valid values for the axis are {@link View#X_AXIS} and |
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* {@link View#Y_AXIS}. |
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* |
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* @param axis the axis |
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* |
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* @return <code>true</code> if the layout along the specified |
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* <code>axis</code> is valid, <code>false</code> otherwise |
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*/ |
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protected boolean isLayoutValid(int axis) |
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{ |
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boolean valid = false; |
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switch (axis) |
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{ |
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case X_AXIS: |
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valid = xLayoutValid; |
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break; |
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case Y_AXIS: |
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valid = yLayoutValid; |
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break; |
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default: |
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throw new IllegalArgumentException("Invalid axis parameter."); |
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} |
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return valid; |
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} |
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/** |
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* Paints the child <code>View</code> at the specified <code>index</code>. |
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* This method modifies the actual values in <code>alloc</code> so make |
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* sure you have a copy of the original values if you need them. |
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* |
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* @param g the <code>Graphics</code> context to paint to |
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* @param alloc the allocated region for the child to paint into |
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* @param index the index of the child to be painted |
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* |
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* @see {@link #childAllocation} |
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*/ |
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protected void paintChild(Graphics g, Rectangle alloc, int index) |
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{ |
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View child = getView(index); |
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childAllocation(index, alloc); |
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child.paint(g, alloc); |
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} |
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/** |
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* Replaces child views by some other child views. If there are no views to |
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* remove (<code>length == 0</code>), the result is a simple insert, if |
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* there are no children to add (<code>view == null</code>) the result |
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* is a simple removal. |
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* |
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* In addition this invalidates the layout and resizes the internal cache |
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* for the child allocations. The old children's cached allocations can |
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* still be accessed (although they are not guaranteed to be valid), and |
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* the new children will have an initial offset and span of 0. |
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* |
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* @param offset the start offset from where to remove children |
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* @param length the number of children to remove |
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* @param views the views that replace the removed children |
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*/ |
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public void replace(int offset, int length, View[] views) |
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{ |
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// Resize and copy data for cache arrays. |
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// The spansX cache. |
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int oldSize = getViewCount(); |
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|
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int[] newSpansX = new int[oldSize - length + views.length]; |
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System.arraycopy(spansX, 0, newSpansX, 0, offset); |
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System.arraycopy(spansX, offset + length, newSpansX, |
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offset + views.length, |
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oldSize - (offset + length)); |
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spansX = newSpansX; |
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|
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// The spansY cache. |
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int[] newSpansY = new int[oldSize - length + views.length]; |
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System.arraycopy(spansY, 0, newSpansY, 0, offset); |
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System.arraycopy(spansY, offset + length, newSpansY, |
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offset + views.length, |
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oldSize - (offset + length)); |
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spansY = newSpansY; |
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|
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// The offsetsX cache. |
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int[] newOffsetsX = new int[oldSize - length + views.length]; |
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System.arraycopy(offsetsX, 0, newOffsetsX, 0, offset); |
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System.arraycopy(offsetsX, offset + length, newOffsetsX, |
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offset + views.length, |
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oldSize - (offset + length)); |
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offsetsX = newOffsetsX; |
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|
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// The offsetsY cache. |
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int[] newOffsetsY = new int[oldSize - length + views.length]; |
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System.arraycopy(offsetsY, 0, newOffsetsY, 0, offset); |
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System.arraycopy(offsetsY, offset + length, newOffsetsY, |
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offset + views.length, |
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oldSize - (offset + length)); |
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offsetsY = newOffsetsY; |
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|
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// Actually perform the replace. |
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super.replace(offset, length, views); |
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// Invalidate layout information. |
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layoutChanged(X_AXIS); |
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layoutChanged(Y_AXIS); |
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} |
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|
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/** |
/** |
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* Renders the <code>Element</code> that is associated with this |
* Renders the <code>Element</code> that is associated with this |
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*/ |
*/ |
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public void paint(Graphics g, Shape a) |
public void paint(Graphics g, Shape a) |
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{ |
{ |
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// TODO: Implement me. |
// Adjust size if the size is changed. |
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} |
Rectangle bounds = a.getBounds(); |
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|
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if (bounds.width != getWidth() || bounds.height != getHeight()) |
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setSize(bounds.width, bounds.height); |
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Rectangle inside = getInsideAllocation(a); |
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Rectangle copy = new Rectangle(inside); |
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int count = getViewCount(); |
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for (int i = 0; i < count; ++i) |
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{ |
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// TODO: Figure out if the parameter to paintChild is meant to |
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// be the child allocation or the allocation of this BoxView. |
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// I assume the second option here. |
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// We pass this method a copy of the inside rectangle here because |
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// it modifies the actual values. |
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copy.setBounds(inside); |
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paintChild(g, copy, i); |
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} |
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} |
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|
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/** |
/** |
320 |
* Returns the preferred span of the content managed by this |
* Returns the preferred span of the content managed by this |
326 |
*/ |
*/ |
327 |
public float getPreferredSpan(int axis) |
public float getPreferredSpan(int axis) |
328 |
{ |
{ |
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// TODO: Implement me. |
SizeRequirements sr = new SizeRequirements(); |
330 |
return 0F; |
int pref = baselineRequirements(axis, sr).preferred; |
331 |
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return (float) pref; |
332 |
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} |
333 |
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|
334 |
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public float getMaximumSpan(int axis) |
335 |
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{ |
336 |
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if (axis == getAxis()) |
337 |
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return getPreferredSpan(axis); |
338 |
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else |
339 |
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return Integer.MAX_VALUE; |
340 |
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} |
341 |
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|
342 |
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/** |
343 |
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* Calculates the size requirements for this <code>BoxView</code> along |
344 |
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* the specified axis. |
345 |
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* |
346 |
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* @param axis the axis that is examined |
347 |
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* @param sr the <code>SizeRequirements</code> object to hold the result, |
348 |
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* if <code>null</code>, a new one is created |
349 |
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* |
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* @return the size requirements for this <code>BoxView</code> along |
351 |
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* the specified axis |
352 |
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*/ |
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protected SizeRequirements baselineRequirements(int axis, |
354 |
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SizeRequirements sr) |
355 |
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{ |
356 |
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SizeRequirements result; |
357 |
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if (axis == myAxis) |
358 |
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result = calculateMajorAxisRequirements(axis, sr); |
359 |
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else |
360 |
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result = calculateMinorAxisRequirements(axis, sr); |
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return result; |
362 |
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} |
363 |
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|
364 |
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/** |
365 |
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* Calculates the size requirements of this <code>BoxView</code> along |
366 |
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* its major axis, that is the axis specified in the constructor. |
367 |
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* |
368 |
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* @param axis the axis that is examined |
369 |
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* @param sr the <code>SizeRequirements</code> object to hold the result, |
370 |
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* if <code>null</code>, a new one is created |
371 |
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* |
372 |
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* @return the size requirements for this <code>BoxView</code> along |
373 |
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* the specified axis |
374 |
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*/ |
375 |
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protected SizeRequirements calculateMajorAxisRequirements(int axis, |
376 |
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SizeRequirements sr) |
377 |
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{ |
378 |
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if (sr == null) |
379 |
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sr = new SizeRequirements(); |
380 |
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else |
381 |
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{ |
382 |
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sr.maximum = 0; |
383 |
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sr.minimum = 0; |
384 |
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sr.preferred = 0; |
385 |
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sr.alignment = 0.5F; |
386 |
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} |
387 |
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|
388 |
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int count = getViewCount(); |
389 |
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|
390 |
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// Sum up the sizes of the children along the specified axis. |
391 |
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for (int i = 0; i < count; ++i) |
392 |
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{ |
393 |
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View child = getView(i); |
394 |
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sr.minimum += child.getMinimumSpan(axis); |
395 |
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sr.preferred += child.getPreferredSpan(axis); |
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sr.maximum += child.getMaximumSpan(axis); |
397 |
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} |
398 |
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return sr; |
399 |
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} |
400 |
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|
401 |
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/** |
402 |
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* Calculates the size requirements of this <code>BoxView</code> along |
403 |
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* its minor axis, that is the axis opposite to the axis specified in the |
404 |
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* constructor. |
405 |
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* |
406 |
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* @param axis the axis that is examined |
407 |
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* @param sr the <code>SizeRequirements</code> object to hold the result, |
408 |
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* if <code>null</code>, a new one is created |
409 |
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* |
410 |
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* @return the size requirements for this <code>BoxView</code> along |
411 |
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* the specified axis |
412 |
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*/ |
413 |
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protected SizeRequirements calculateMinorAxisRequirements(int axis, |
414 |
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SizeRequirements sr) |
415 |
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{ |
416 |
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if (sr == null) |
417 |
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sr = new SizeRequirements(); |
418 |
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else |
419 |
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{ |
420 |
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sr.maximum = 0; |
421 |
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sr.minimum = 0; |
422 |
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sr.preferred = 0; |
423 |
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sr.alignment = 0.5F; |
424 |
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} |
425 |
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|
426 |
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int count = getViewCount(); |
427 |
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|
428 |
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int aboveBaseline = 0; |
429 |
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int belowBaseline = 0; |
430 |
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int aboveBaselineMin = 0; |
431 |
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int belowBaselineMin = 0; |
432 |
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int aboveBaselineMax = 0; |
433 |
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int belowBaselineMax = 0; |
434 |
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|
435 |
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for (int i = 0; i < count; ++i) |
436 |
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{ |
437 |
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View child = getView(i); |
438 |
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float align = child.getAlignment(axis); |
439 |
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int pref = (int) child.getPreferredSpan(axis); |
440 |
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int min = (int) child.getMinimumSpan(axis); |
441 |
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int max = (int) child.getMaximumSpan(axis); |
442 |
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aboveBaseline += (int) (align * pref); |
443 |
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belowBaseline += (int) ((1.F - align) * pref); |
444 |
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aboveBaselineMin += (int) (align * min); |
445 |
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belowBaselineMin += (int) ((1.F - align) * min); |
446 |
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aboveBaselineMax += (int) (align * max); |
447 |
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belowBaselineMax += (int) ((1.F - align) * max); |
448 |
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} |
449 |
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sr.minimum = aboveBaselineMin + belowBaselineMin; |
450 |
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sr.maximum = aboveBaselineMax + belowBaselineMax; |
451 |
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sr.preferred = aboveBaseline + belowBaseline; |
452 |
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if (aboveBaseline == 0) |
453 |
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sr.alignment = 1.0F; |
454 |
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else |
455 |
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sr.alignment = (float) (sr.preferred / aboveBaseline); |
456 |
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|
457 |
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return sr; |
458 |
} |
} |
459 |
|
|
460 |
/** |
/** |
472 |
*/ |
*/ |
473 |
protected boolean isBefore(int x, int y, Rectangle r) |
protected boolean isBefore(int x, int y, Rectangle r) |
474 |
{ |
{ |
475 |
// TODO: Implement this properly. |
boolean result = false; |
476 |
return false; |
|
477 |
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if (myAxis == X_AXIS) |
478 |
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result = x < r.x; |
479 |
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else |
480 |
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result = y < r.y; |
481 |
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|
482 |
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return result; |
483 |
} |
} |
484 |
|
|
485 |
/** |
/** |
497 |
*/ |
*/ |
498 |
protected boolean isAfter(int x, int y, Rectangle r) |
protected boolean isAfter(int x, int y, Rectangle r) |
499 |
{ |
{ |
500 |
// TODO: Implement this properly. |
boolean result = false; |
501 |
return false; |
|
502 |
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if (myAxis == X_AXIS) |
503 |
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result = x > r.x; |
504 |
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else |
505 |
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result = y > r.y; |
506 |
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|
507 |
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return result; |
508 |
} |
} |
509 |
|
|
510 |
/** |
/** |
512 |
* |
* |
513 |
* @param x the X coordinate |
* @param x the X coordinate |
514 |
* @param y the Y coordinate |
* @param y the Y coordinate |
515 |
* @param r the allocation of this <code>CompositeView</code> |
* @param r the inner allocation of this <code>BoxView</code> on entry, |
516 |
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* the allocation of the found child on exit |
517 |
* |
* |
518 |
* @return the child <code>View</code> at the specified location |
* @return the child <code>View</code> at the specified location |
519 |
*/ |
*/ |
520 |
protected View getViewAtPoint(int x, int y, Rectangle r) |
protected View getViewAtPoint(int x, int y, Rectangle r) |
521 |
{ |
{ |
522 |
// TODO: Implement this properly. |
View result = null; |
523 |
return null; |
|
524 |
|
int count = getViewCount(); |
525 |
|
Rectangle copy = new Rectangle(r); |
526 |
|
|
527 |
|
for (int i = 0; i < count; ++i) |
528 |
|
{ |
529 |
|
copy.setBounds(r); |
530 |
|
childAllocation(i, r); |
531 |
|
if (copy.contains(x, y)) |
532 |
|
{ |
533 |
|
result = getView(i); |
534 |
|
break; |
535 |
|
} |
536 |
|
} |
537 |
|
|
538 |
|
return result; |
539 |
} |
} |
540 |
|
|
541 |
/** |
/** |
549 |
*/ |
*/ |
550 |
protected void childAllocation(int index, Rectangle a) |
protected void childAllocation(int index, Rectangle a) |
551 |
{ |
{ |
552 |
// TODO: Implement this properly. |
if (! isAllocationValid()) |
553 |
|
layout(a.width, a.height); |
554 |
|
|
555 |
|
a.x += offsetsX[index]; |
556 |
|
a.y += offsetsY[index]; |
557 |
|
a.width = spansX[index]; |
558 |
|
a.height = spansY[index]; |
559 |
|
} |
560 |
|
|
561 |
|
/** |
562 |
|
* Lays out the children of this <code>BoxView</code> with the specified |
563 |
|
* bounds. |
564 |
|
* |
565 |
|
* @param width the width of the allocated region for the children (that |
566 |
|
* is the inner allocation of this <code>BoxView</code> |
567 |
|
* @param height the height of the allocated region for the children (that |
568 |
|
* is the inner allocation of this <code>BoxView</code> |
569 |
|
*/ |
570 |
|
protected void layout(int width, int height) |
571 |
|
{ |
572 |
|
this.width = width; |
573 |
|
this.height = height; |
574 |
|
|
575 |
|
if (myAxis == X_AXIS) |
576 |
|
{ |
577 |
|
layoutMajorAxis(width, X_AXIS, offsetsX, spansX); |
578 |
|
layoutMinorAxis(height, Y_AXIS, offsetsY, spansY); |
579 |
|
} |
580 |
|
else |
581 |
|
{ |
582 |
|
layoutMajorAxis(height, Y_AXIS, offsetsY, spansY); |
583 |
|
layoutMinorAxis(width, X_AXIS, offsetsX, spansX); |
584 |
|
} |
585 |
|
} |
586 |
|
|
587 |
|
/** |
588 |
|
* Performs the layout along the major axis of a <code>BoxView</code>. |
589 |
|
* |
590 |
|
* @param targetSpan the (inner) span of the <code>BoxView</code> in which |
591 |
|
* to layout the children |
592 |
|
* @param axis the axis along which the layout is performed |
593 |
|
* @param offsets the array that holds the offsets of the children on exit |
594 |
|
* @param offsets the array that holds the spans of the children on exit |
595 |
|
*/ |
596 |
|
protected void layoutMajorAxis(int targetSpan, int axis, int[] offsets, |
597 |
|
int[] spans) |
598 |
|
{ |
599 |
|
// Allocate SizeRequirements for each child view. |
600 |
|
int count = getViewCount(); |
601 |
|
SizeRequirements[] childReqs = new SizeRequirements[count]; |
602 |
|
for (int i = 0; i < count; ++i) |
603 |
|
{ |
604 |
|
View view = getView(i); |
605 |
|
childReqs[i] = new SizeRequirements((int) view.getMinimumSpan(axis), |
606 |
|
(int) view.getPreferredSpan(axis), |
607 |
|
(int) view.getMaximumSpan(axis), |
608 |
|
view.getAlignment(axis)); |
609 |
|
} |
610 |
|
|
611 |
|
// Calculate the spans and offsets using the SizeRequirements uility |
612 |
|
// methods. |
613 |
|
SizeRequirements.calculateTiledPositions(targetSpan, null, childReqs, |
614 |
|
offsets, spans); |
615 |
|
|
616 |
|
validateLayout(axis); |
617 |
|
} |
618 |
|
|
619 |
|
/** |
620 |
|
* Performs the layout along the minor axis of a <code>BoxView</code>. |
621 |
|
* |
622 |
|
* @param targetSpan the (inner) span of the <code>BoxView</code> in which |
623 |
|
* to layout the children |
624 |
|
* @param axis the axis along which the layout is performed |
625 |
|
* @param offsets the array that holds the offsets of the children on exit |
626 |
|
* @param offsets the array that holds the spans of the children on exit |
627 |
|
*/ |
628 |
|
protected void layoutMinorAxis(int targetSpan, int axis, int[] offsets, |
629 |
|
int[] spans) |
630 |
|
{ |
631 |
|
// Allocate SizeRequirements for each child view. |
632 |
|
int count = getViewCount(); |
633 |
|
SizeRequirements[] childReqs = new SizeRequirements[count]; |
634 |
|
for (int i = 0; i < count; ++i) |
635 |
|
{ |
636 |
|
View view = getView(i); |
637 |
|
childReqs[i] = new SizeRequirements((int) view.getMinimumSpan(axis), |
638 |
|
(int) view.getPreferredSpan(axis), |
639 |
|
(int) view.getMaximumSpan(axis), |
640 |
|
view.getAlignment(axis)); |
641 |
|
} |
642 |
|
|
643 |
|
// Calculate the spans and offsets using the SizeRequirements uility |
644 |
|
// methods. |
645 |
|
SizeRequirements.calculateAlignedPositions(targetSpan, null, childReqs, |
646 |
|
offsets, spans); |
647 |
|
validateLayout(axis); |
648 |
|
} |
649 |
|
|
650 |
|
/** |
651 |
|
* Returns <code>true</code> if the cached allocations for the children |
652 |
|
* are still valid, <code>false</code> otherwise. |
653 |
|
* |
654 |
|
* @return <code>true</code> if the cached allocations for the children |
655 |
|
* are still valid, <code>false</code> otherwise |
656 |
|
*/ |
657 |
|
protected boolean isAllocationValid() |
658 |
|
{ |
659 |
|
return isLayoutValid(X_AXIS) && isLayoutValid(Y_AXIS); |
660 |
|
} |
661 |
|
|
662 |
|
/** |
663 |
|
* Return the current width of the box. This is the last allocated width. |
664 |
|
* |
665 |
|
* @return the current width of the box |
666 |
|
*/ |
667 |
|
public int getWidth() |
668 |
|
{ |
669 |
|
return width; |
670 |
|
} |
671 |
|
|
672 |
|
/** |
673 |
|
* Return the current height of the box. This is the last allocated height. |
674 |
|
* |
675 |
|
* @return the current height of the box |
676 |
|
*/ |
677 |
|
public int getHeight() |
678 |
|
{ |
679 |
|
return height; |
680 |
|
} |
681 |
|
|
682 |
|
/** |
683 |
|
* Sets the size of the view. If the actual size has changed, the layout |
684 |
|
* is updated accordingly. |
685 |
|
* |
686 |
|
* @param width the new width |
687 |
|
* @param height the new height |
688 |
|
*/ |
689 |
|
public void setSize(float width, float height) |
690 |
|
{ |
691 |
|
if (this.width != (int) width) |
692 |
|
layoutChanged(X_AXIS); |
693 |
|
if (this.height != (int) height) |
694 |
|
layoutChanged(Y_AXIS); |
695 |
|
|
696 |
|
Rectangle outside = new Rectangle(0, 0, this.width, this.height); |
697 |
|
Rectangle inside = getInsideAllocation(outside); |
698 |
|
if (!isAllocationValid()) |
699 |
|
layout(inside.width, inside.height); |
700 |
|
} |
701 |
|
|
702 |
|
/** |
703 |
|
* Sets the layout to valid for a specific axis. |
704 |
|
* |
705 |
|
* @param axis the axis for which to validate the layout |
706 |
|
*/ |
707 |
|
void validateLayout(int axis) |
708 |
|
{ |
709 |
|
if (axis == X_AXIS) |
710 |
|
xLayoutValid = true; |
711 |
|
if (axis == Y_AXIS) |
712 |
|
yLayoutValid = true; |
713 |
} |
} |
714 |
} |
} |