Initial revision

From-SVN: r102074

libjava/classpath/javax/swing/text/FieldView.java

@@ -0,0 +1,176 @@
+/* FieldView.java -- 
+   Copyright (C) 2004 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.ComponentOrientation;
+import java.awt.FontMetrics;
+import java.awt.Graphics;
+import java.awt.Rectangle;
+import java.awt.Shape;
+
+import javax.swing.JTextField;
+import javax.swing.event.DocumentEvent;
+
+public class FieldView extends PlainView
+{
+  public FieldView(Element elem)
+  {
+    super(elem);
+  }
+
+  protected FontMetrics getFontMetrics()
+  {
+    Component container = getContainer();
+    return container.getFontMetrics(container.getFont());
+  }
+
+  /**
+   * Vertically centers the single line of text within the
+   * bounds of the input shape. The returned Rectangle is centered
+   * vertically within <code>shape</code> and has a height of the
+   * preferred span along the Y axis. Horizontal adjustment is done according
+   * to the horizontalAligment property of the component that is rendered.
+   *
+   * @param shape the shape within which the line is beeing centered
+   */
+  protected Shape adjustAllocation(Shape shape)
+  {
+    Rectangle rectIn = shape.getBounds();
+    // vertical adjustment
+    int height = (int) getPreferredSpan(Y_AXIS);
+    int y = rectIn.y + (rectIn.height - height) / 2;
+    // horizontal adjustment
+    JTextField textField = (JTextField) getContainer();
+    int halign = textField.getHorizontalAlignment();
+    int width = (int) getPreferredSpan(X_AXIS);
+    int x;
+    ComponentOrientation orientation = textField.getComponentOrientation();
+    switch (halign)
+      {
+      case JTextField.CENTER:
+        x = rectIn.x + (rectIn.width - width) / 2;
+        break;
+      case JTextField.RIGHT:
+        x = rectIn.x + (rectIn.width - width);
+        break;
+      case JTextField.TRAILING:
+        if (orientation.isLeftToRight())
+          x = rectIn.x + (rectIn.width - width);
+        else
+          x = rectIn.x;
+        break;
+      case JTextField.LEADING:
+        if (orientation.isLeftToRight())
+          x = rectIn.x;
+        else
+          x = rectIn.x + (rectIn.width - width);
+        break;
+      case JTextField.LEFT:
+      default:
+        x = rectIn.x;
+        break;
+      }
+    return new Rectangle(x, y, width, height);
+  }
+
+  public float getPreferredSpan(int axis)
+  {
+    if (axis != X_AXIS && axis != Y_AXIS)
+      throw new IllegalArgumentException();
+
+    FontMetrics fm = getFontMetrics();
+
+    if (axis == Y_AXIS)
+      return fm.getHeight();
+
+    String text;
+    Element elem = getElement();
+
+    try
+      {
+	text = elem.getDocument().getText(elem.getStartOffset(),
+					  elem.getEndOffset());
+      }
+    catch (BadLocationException e)
+      {
+	// This should never happen.
+	text = "";
+      }
+    
+    return fm.stringWidth(text);
+  }
+
+  public int getResizeWeight(int axis)
+  {
+    return axis = axis == X_AXIS ? 1 : 0;
+  }
+  
+  public Shape modelToView(int pos, Shape a, Position.Bias bias)
+    throws BadLocationException
+  {
+    Shape newAlloc = adjustAllocation(a);
+    return super.modelToView(pos, newAlloc, bias);
+  }
+  
+  public void paint(Graphics g, Shape s)
+  {
+    Shape newAlloc = adjustAllocation(s);
+    super.paint(g, newAlloc);
+  }
+
+  public void insertUpdate(DocumentEvent ev, Shape shape, ViewFactory vf)
+  {
+    Shape newAlloc = adjustAllocation(shape);
+    super.insertUpdate(ev, newAlloc, vf);
+  }
+
+  public void removeUpdate(DocumentEvent ev, Shape shape, ViewFactory vf)
+  {
+    Shape newAlloc = adjustAllocation(shape);
+    super.removeUpdate(ev, newAlloc, vf);
+  }
+
+  public void changedUpdate(DocumentEvent ev, Shape shape, ViewFactory vf)
+  {
+    Shape newAlloc = adjustAllocation(shape);
+    super.removeUpdate(ev, newAlloc, vf);
+  }
+
+}