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authorMark Wielaard <mark@gcc.gnu.org>2005-11-15 23:20:01 +0000
committerMark Wielaard <mark@gcc.gnu.org>2005-11-15 23:20:01 +0000
commit8f523f3a1047919d3563daf1ef47ba87336ebe89 (patch)
treea5eb7cf42a51869cc8aa1fad7ad6a90cca47fdd8 /libjava/classpath/java/awt/BorderLayout.java
parent02e549bfaaec38f68307e7f34e46ea57ea1809af (diff)
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Imported GNU Classpath 0.19 + gcj-import-20051115.
* sources.am: Regenerated. * Makefile.in: Likewise. * scripts/makemake.tcl: Use glob -nocomplain. From-SVN: r107049
Diffstat (limited to 'libjava/classpath/java/awt/BorderLayout.java')
-rw-r--r--libjava/classpath/java/awt/BorderLayout.java130
1 files changed, 120 insertions, 10 deletions
diff --git a/libjava/classpath/java/awt/BorderLayout.java b/libjava/classpath/java/awt/BorderLayout.java
index adf2ebf..1b67c01 100644
--- a/libjava/classpath/java/awt/BorderLayout.java
+++ b/libjava/classpath/java/awt/BorderLayout.java
@@ -38,6 +38,7 @@ exception statement from your version. */
package java.awt;
+
/**
* This class implements a layout manager that positions components
* in certain sectors of the parent container.
@@ -229,6 +230,12 @@ public class BorderLayout implements LayoutManager2, java.io.Serializable
private int vgap;
+ // Some constants for use with calcSize().
+ private static final int MIN = 0;
+ private static final int MAX = 1;
+ private static final int PREF = 2;
+
+
/**
* Initializes a new instance of <code>BorderLayout</code> with no
* horiztonal or vertical gaps between components.
@@ -423,7 +430,7 @@ public class BorderLayout implements LayoutManager2, java.io.Serializable
*/
public float getLayoutAlignmentX(Container parent)
{
- return(parent.getAlignmentX());
+ return 0.5F;
}
/**
@@ -438,7 +445,7 @@ public class BorderLayout implements LayoutManager2, java.io.Serializable
*/
public float getLayoutAlignmentY(Container parent)
{
- return(parent.getAlignmentY());
+ return 0.5F;
}
/**
@@ -449,7 +456,7 @@ public class BorderLayout implements LayoutManager2, java.io.Serializable
*/
public void invalidateLayout(Container parent)
{
- // FIXME: Implement this properly!
+ // Nothing to do here.
}
/**
@@ -560,7 +567,8 @@ public class BorderLayout implements LayoutManager2, java.io.Serializable
}
/**
- * FIXME: Document me!
+ * This is a convenience method to set the bounds on a component.
+ * If the indicated component is null, nothing is done.
*/
private void setBounds(Component comp, int x, int y, int w, int h)
{
@@ -569,12 +577,6 @@ public class BorderLayout implements LayoutManager2, java.io.Serializable
comp.setBounds(x, y, w, h);
}
- // FIXME: Maybe move to top of file.
- // Some constants for use with calcSize().
- private static final int MIN = 0;
- private static final int MAX = 1;
- private static final int PREF = 2;
-
private Dimension calcCompSize(Component comp, int what)
{
if (comp == null || !comp.isVisible())
@@ -660,4 +662,112 @@ public class BorderLayout implements LayoutManager2, java.io.Serializable
return(new Dimension(width, height));
}
}
+
+ /**
+ * Return the component at the indicated location, or null if no component
+ * is at that location. The constraints argument must be one of the
+ * location constants specified by this class.
+ * @param constraints the location
+ * @return the component at that location, or null
+ * @throws IllegalArgumentException if the constraints argument is not
+ * recognized
+ * @since 1.5
+ */
+ public Component getLayoutComponent(Object constraints)
+ {
+ if (constraints == CENTER)
+ return center;
+ if (constraints == NORTH)
+ return north;
+ if (constraints == EAST)
+ return east;
+ if (constraints == SOUTH)
+ return south;
+ if (constraints == WEST)
+ return west;
+ if (constraints == PAGE_START)
+ return firstLine;
+ if (constraints == PAGE_END)
+ return lastLine;
+ if (constraints == LINE_START)
+ return firstItem;
+ if (constraints == LINE_END)
+ return lastItem;
+ throw new IllegalArgumentException("constraint " + constraints
+ + " is not recognized");
+ }
+
+ /**
+ * Return the component at the specified location, which must be one
+ * of the absolute constants such as CENTER or SOUTH. The container's
+ * orientation is used to map this location to the correct corresponding
+ * component, so for instance in a right-to-left container, a request
+ * for the EAST component could return the LINE_END component. This will
+ * return null if no component is available at the given location.
+ * @param container the container whose orientation is used
+ * @param constraints the absolute location of the component
+ * @return the component at the location, or null
+ * @throws IllegalArgumentException if the constraint is not recognized
+ */
+ public Component getLayoutComponent(Container container, Object constraints)
+ {
+ ComponentOrientation orient = container.getComponentOrientation();
+ if (constraints == CENTER)
+ return center;
+ // Note that we don't support vertical layouts.
+ if (constraints == NORTH)
+ return north;
+ if (constraints == SOUTH)
+ return south;
+ if (constraints == WEST)
+ {
+ // Note that relative layout takes precedence.
+ if (orient.isLeftToRight())
+ return firstItem == null ? west : firstItem;
+ return lastItem == null ? west : lastItem;
+ }
+ if (constraints == EAST)
+ {
+ // Note that relative layout takes precedence.
+ if (orient.isLeftToRight())
+ return lastItem == null ? east : lastItem;
+ return firstItem == null ? east : firstItem;
+ }
+ throw new IllegalArgumentException("constraint " + constraints
+ + " is not recognized");
+ }
+
+ /**
+ * Return the constraint corresponding to a component in this layout.
+ * If the component is null, or is not in this layout, returns null.
+ * Otherwise, this will return one of the constraint constants defined
+ * in this class.
+ * @param c the component
+ * @return the constraint, or null
+ * @since 1.5
+ */
+ public Object getConstraints(Component c)
+ {
+ if (c == null)
+ return null;
+ if (c == center)
+ return CENTER;
+ if (c == north)
+ return NORTH;
+ if (c == east)
+ return EAST;
+ if (c == south)
+ return SOUTH;
+ if (c == west)
+ return WEST;
+ if (c == firstLine)
+ return PAGE_START;
+ if (c == lastLine)
+ return PAGE_END;
+ if (c == firstItem)
+ return LINE_START;
+ if (c == lastItem)
+ return LINE_END;
+ return null;
+ }
}
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