+++ /dev/null
-/* Copyright (C) 2000 Free Software Foundation
-
- This file is part of libgcj.
-
-This software is copyrighted work licensed under the terms of the
-Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
-details. */
-
-package java.awt;
-
-import java.awt.event.AdjustmentListener;
-import java.awt.peer.ScrollPanePeer;
-
-/** A ScrollPane is a component that has vertical and horizontal
- * scrollbars as well as a single child which is scrolled by them.
- * @author Tom Tromey <tromey@redhat.com>
- * @date December 31, 2000
- */
-public class ScrollPane extends Container
-{
- /** This indicates that scrollbars should only be displayed when
- * needed. */
- public static final int SCROLLBARS_AS_NEEDED = 0;
- /** This indicates that scrollbars should always be displayed. */
- public static final int SCROLLBARS_ALWAYS = 1;
- /** This indicates that scrollbars should never be displayed. */
- public static final int SCROLLBARS_NEVER = 2;
-
- /** Create a new ScrollPane object using the indicated scrollbar
- * display policy. If the policy is not specified it defaults to
- * SCROLLBARS_AS_NEEDED. The default size of this component is
- * 100x100.
- * @param policy The scrollbar display policy
- */
- public ScrollPane ()
- {
- this (SCROLLBARS_AS_NEEDED);
- }
-
- public ScrollPane (int policy)
- {
- if (policy != SCROLLBARS_AS_NEEDED
- && policy != SCROLLBARS_ALWAYS
- && policy != SCROLLBARS_NEVER)
- throw new IllegalArgumentException ("invalid value for policy");
-
- this.policy = policy;
- setSize (100, 100);
- }
-
- /** Add a component to this ScrollPane.
- * @param comp The component to add
- * @param constraints Constraints. This is ignored.
- * @param pos Position. This must be <= 0, but is otherwise ignored.
- */
- protected final void addImpl (Component comp, Object constraints,
- int pos)
- {
- if (pos > 0)
- throw new IllegalArgumentException ("pos must be <= 0");
-
- if (ncomponents > 0)
- remove (component[0]);
-
- if (comp.isLightweight ())
- {
- Panel p = new Panel ();
- p.add (comp);
- comp = p;
- }
-
- super.addImpl (comp, constraints, pos);
- }
-
- /** This creates the component's peer. */
- public void addNotify ()
- {
- if (peer == null)
- peer = getToolkit ().createScrollPane (this);
- super.addNotify ();
- }
-
- /** Lays out the components in this container. */
- public void doLayout ()
- {
- ScrollPanePeer spp = (ScrollPanePeer) peer;
- Dimension c = component[0].getPreferredSize ();
- component[0].setSize (c.width, c.height);
- spp.childResized (c.width, c.height);
- // Update the scrollbar position to the closest valid value.
- setScrollPosition (hscroll.getValue (), vscroll.getValue ());
- }
-
- /** Returns an Adjustable representing the horizontal scrollbar.
- * The methods setMaximum, setMinimum, and setVisibleAmount should
- * not be called on this Adjustable. They will throw AWTError if
- * called.
- */
- public Adjustable getHAdjustable ()
- {
- return hscroll;
- }
-
- /** Returns the height of the horizontal scrollbar. */
- public int getHScrollbarHeight ()
- {
- if (peer == null)
- return 0;
- ScrollPanePeer spp = (ScrollPanePeer) peer;
- return spp.getHScrollbarHeight ();
- }
-
- /** Returns the scrollbar display policy. */
- public int getScrollbarDisplayPolicy ()
- {
- return policy;
- }
-
- /** Returns the viewport's scroll position. */
- public Point getScrollPosition ()
- {
- return new Point (hscroll.getValue (), vscroll.getValue ());
- }
-
- /** Returns an Adjustable representing the vertical scrollbar.
- * The methods setMaximum, setMinimum, and setVisibleAmount should
- * not be called on this Adjustable. They will throw AWTError if
- * called.
- */
- public Adjustable getVAdjustable ()
- {
- return vscroll;
- }
-
- /** Returns the size of the viewport. */
- public Dimension getViewportSize ()
- {
- // Note: according to the online docs, the Insets are
- // automatically updated by the peer to include the scrollbar
- // sizes.
- Insets ins = getInsets ();
- int myw = width - ins.left - ins.right;
- int myh = height - ins.top - ins.bottom;
-
- Dimension cs;
- if (ncomponents > 0)
- cs = component[0].getPreferredSize ();
- else
- cs = new Dimension (myw, myh);
-
- // A little optimization -- reuse the Dimension.
- cs.setSize (myw, myh);
- return cs;
- }
-
- /** Returns the width of the vertical scrollbar. */
- public int getVScrollbarWidth ()
- {
- if (peer == null)
- return 0;
- ScrollPanePeer spp = (ScrollPanePeer) peer;
- return spp.getVScrollbarWidth ();
- }
-
- /** Generates a String representation of this ScrollPane's state. */
- public String paramString ()
- {
- return ("[" + getClass ().getName ()
- + ": " + ((ncomponents > 0) ? component[0].paramString () : "")
- + "]");
- }
-
- /** Set the layout manager for this component. ScrollPane has its
- * own layout manager and overrides this method so that the layout
- * manager cannot be changed.
- * @param m The new layout manager (ignored)
- */
- public final void setLayout (LayoutManager m)
- {
- // Nothing.
- }
-
- /** Sets the scroll position for this ScrollPane. If the point if
- * out of range it is silently moved within range.
- * @param x The x coordinate
- * @param y The y coordinate
- */
- public void setScrollPosition (int x, int y)
- {
- // According to the JCL we throw a NullPointerException if there
- // is no child.
- if (ncomponents == 0)
- throw new NullPointerException ("no child in ScrollPane");
-
- Dimension child_d = component[0].getPreferredSize ();
- Dimension our_d = getViewportSize ();
-
- int xmax = Math.max (0, child_d.width - our_d.width);
- int ymax = Math.max (0, child_d.height - our_d.height);
-
- if (x < 0)
- x = 0;
- else if (x > xmax)
- x = xmax;
- if (y < 0)
- y = 0;
- else if (y > ymax)
- y = ymax;
-
- ScrollPanePeer spp = (ScrollPanePeer) peer;
- spp.setScrollPosition (x, y);
- }
-
- /** Sets the scroll position for this ScrollPane. If the point if
- * out of range it is silently moved within range.
- * @param p The new point
- */
- public void setScrollPosition (Point p)
- {
- setScrollPosition (p.x, p.y);
- }
-
- // This implements the Adjustable for each scrollbar. The
- // expectation is that the peer will look at these objects directly
- // and modify the values in them when the user manipulates the
- // scrollbars. This has to be done from CNI to bypass Java
- // protection rules. The peer should also take care of calling the
- // adjustment listeners.
- class ScrollPaneAdjustable implements Adjustable
- {
- AdjustmentListener listeners;
- int orient;
- int unit;
- int block;
- int value;
-
- public ScrollPaneAdjustable (int orient)
- {
- this.orient = orient;
- }
-
- public void addAdjustmentListener (AdjustmentListener l)
- {
- listeners = AWTEventMulticaster.add (listeners, l);
- }
-
- public int getBlockIncrement ()
- {
- return block;
- }
-
- public int getMaximum ()
- {
- Dimension child_d = component[0].getPreferredSize ();
- Dimension our_d = getViewportSize ();
-
- int xmax = Math.max (0, child_d.width - our_d.width);
- int ymax = Math.max (0, child_d.height - our_d.height);
-
- return (orient == Adjustable.HORIZONTAL) ? xmax : ymax;
- }
-
- public int getMinimum ()
- {
- return 0;
- }
-
- public int getOrientation ()
- {
- return orient;
- }
-
- public int getUnitIncrement ()
- {
- return unit;
- }
-
- public int getValue ()
- {
- return value;
- }
-
- public int getVisibleAmount ()
- {
- Dimension d = getViewportSize ();
- return (orient == Adjustable.HORIZONTAL) ? d.width : d.height;
- }
-
- public void removeAdjustmentListener (AdjustmentListener l)
- {
- listeners = AWTEventMulticaster.remove (listeners, l);
- }
-
- public void setBlockIncrement (int b)
- {
- throw new AWTError ("can't use setBlockIncrement on this Adjustable");
- }
-
- public void setMaximum (int max)
- {
- throw new AWTError ("can't use setMaximum on this Adjustable");
- }
-
- public void setMinimum (int min)
- {
- throw new AWTError ("can't use setMinimum on this Adjustable");
- }
-
- public void setUnitIncrement (int u)
- {
- unit = u;
- if (peer != null)
- {
- ScrollPanePeer spp = (ScrollPanePeer) peer;
- spp.setUnitIncrement (this, u);
- }
- }
-
- public void setValue (int v)
- {
- value = v;
- if (peer != null)
- {
- ScrollPanePeer spp = (ScrollPanePeer) peer;
- spp.setValue (this, v);
- }
- }
-
- public void setVisibleAmount (int v)
- {
- throw new AWTError ("can't use setVisibleAmount on this Adjustable");
- }
- }
-
- ScrollPaneAdjustable hscroll
- = new ScrollPaneAdjustable (Adjustable.HORIZONTAL);
- ScrollPaneAdjustable vscroll
- = new ScrollPaneAdjustable (Adjustable.VERTICAL);
- int policy;
-}
projects / msp430-gcc.git / blobdiff