ScrollPane.java: Wrote.
* java/awt/ScrollPane.java: Wrote. * java/awt/peer/ScrollPanePeer.java (setBlockIncrement): New method. * java/awt/Panel.java (Panel()): Fixed. * java/awt/Component.java (isShowing): Return false if no peer exists, and true if component is visible and no parent exists. (getLocationOnScreen): Wrote. (getPreferredSize): Removed FIXME comment. (getMinimumSize): Likewise. (getAlignmentX, getAlignmentY): Wrote. (list): Wrote. (requestFocus): Wrote. (transferFocus): Wrote. (findNextFocusComponent): New method. (hasFocus()): Wrote. (checkImage): Wrote. (enableEvents): Call setEventMask on the peer. * java/awt/Container.java (list): Use super.list() to print self. (findNextFocusComponent): New method. (setLayout): Call invalidate. (findComponentAt): Wrote. From-SVN: r38639
This commit is contained in:
Tom Tromey
Tom Tromey
parent
4f78b9a896
commit
f5826791be
7 changed files with 547 additions and 98 deletions
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@ -8,8 +8,340 @@ details. */
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package java.awt;
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/* A very incomplete placeholder. */
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import java.awt.event.AdjustmentListener;
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import java.awt.peer.ScrollPanePeer;
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/** A ScrollPane is a component that has vertical and horizontal
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* scrollbars as well as a single child which is scrolled by them.
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* @author Tom Tromey <tromey@redhat.com>
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* @date December 31, 2000
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* Status: Unfinished. The Adjustables are probably wrong (there
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* isn't a mechanism for scrollbar events to affect them), and also
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* doLayout() is not finished.
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*/
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public class ScrollPane extends Container
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{
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/** This indicates that scrollbars should only be displayed when
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* needed. */
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public static final int SCROLLBARS_AS_NEEDED = 0;
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/** This indicates that scrollbars should always be displayed. */
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public static final int SCROLLBARS_ALWAYS = 1;
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/** This indicates that scrollbars should never be displayed. */
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public static final int SCROLLBARS_NEVER = 2;
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/** Create a new ScrollPane object using the indicated scrollbar
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* display policy. If the policy is not specified it defaults to
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* SCROLLBARS_AS_NEEDED. The default size of this component is
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* 100x100.
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* @param policy The scrollbar display policy
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*/
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public ScrollPane ()
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{
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this (SCROLLBARS_AS_NEEDED);
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}
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public ScrollPane (int policy)
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{
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if (policy != SCROLLBARS_AS_NEEDED
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&& policy != SCROLLBARS_ALWAYS
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&& policy != SCROLLBARS_NEVER)
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throw new IllegalArgumentException ("invalid value for policy");
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this.policy = policy;
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setSize (100, 100);
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}
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/** Add a component to this ScrollPane.
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* @param comp The component to add
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* @param constraints Constraints. This is ignored.
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* @param pos Position. This must be <= 0, but is otherwise ignored.
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*/
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protected final void addImpl (Component comp, Object constraints,
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int pos)
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{
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if (pos > 0)
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throw new IllegalArgumentException ("pos must be <= 0");
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if (ncomponents > 0)
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remove (component[0]);
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if (comp.isLightweight ())
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{
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Panel p = new Panel ();
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p.add (comp);
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comp = p;
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}
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super.addImpl (comp, constraints, pos);
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}
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/** This creates the component's peer. */
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public void addNotify ()
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{
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if (peer == null)
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peer = getToolkit ().createScrollPane (this);
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super.addNotify ();
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}
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/** Lays out the components in this container. */
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public void doLayout ()
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{
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ScrollPanePeer spp = (ScrollPanePeer) peer;
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Dimension c = component[0].getPreferredSize ();
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component[0].setSize (c.width, c.height);
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spp.childResized (c.width, c.height);
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// FIXME
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}
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/** Returns an Adjustable representing the horizontal scrollbar.
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* The methods setMaximum, setMinimum, and setVisibleAmount should
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* not be called on this Adjustable. They will throw AWTError if
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* called.
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*/
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public Adjustable getHAdjustable ()
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{
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return hscroll;
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}
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/** Returns the height of the horizontal scrollbar. */
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public int getHScrollbarHeight ()
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{
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if (peer == null)
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return 0;
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ScrollPanePeer spp = (ScrollPanePeer) peer;
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return spp.getHScrollbarHeight ();
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}
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/** Returns the scrollbar display policy. */
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public int getScrollbarDisplayPolicy ()
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{
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return policy;
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}
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/** Returns the viewport's scroll position. */
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public Point getScrollPosition ()
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{
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// FIXME
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return null;
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}
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/** Returns an Adjustable representing the vertical scrollbar.
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* The methods setMaximum, setMinimum, and setVisibleAmount should
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* not be called on this Adjustable. They will throw AWTError if
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* called.
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*/
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public Adjustable getVAdjustable ()
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{
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return vscroll;
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}
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/** Returns the size of the viewport. */
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public Dimension getViewportSize ()
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{
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Insets ins = getInsets ();
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int myw = width - ins.left - ins.right;
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int myh = height - ins.top - ins.bottom;
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Dimension cs;
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if (ncomponents > 0)
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cs = component[0].getPreferredSize ();
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else
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cs = new Dimension (myw, myh);
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if (policy == SCROLLBARS_ALWAYS
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|| (policy == SCROLLBARS_AS_NEEDED && myw < cs.width))
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myw -= getVScrollbarWidth ();
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if (policy == SCROLLBARS_ALWAYS
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|| (policy == SCROLLBARS_AS_NEEDED && myh < cs.height))
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myh -= getHScrollbarHeight ();
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// A little optimization -- reuse the Dimension.
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cs.setSize (myw, myh);
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return cs;
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}
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/** Returns the width of the vertical scrollbar. */
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public int getVScrollbarWidth ()
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{
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if (peer == null)
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return 0;
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ScrollPanePeer spp = (ScrollPanePeer) peer;
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return spp.getVScrollbarWidth ();
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}
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/** Generates a String representation of this ScrollPane's state. */
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public String paramString ()
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{
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return ("[" + getClass ().getName ()
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+ ": " + ((ncomponents > 0) ? component[0].paramString () : "")
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+ "]");
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}
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/** Set the layout manager for this component. ScrollPane has its
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* own layout manager and overrides this method so that the layout
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* manager cannot be changed.
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* @param m The new layout manager (ignored)
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*/
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public final void setLayout (LayoutManager m)
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{
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// Nothing.
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}
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/** Sets the scroll position for this ScrollPane. If the point if
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* out of range it is silently moved within range.
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* @param x The x coordinate
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* @param y The y coordinate
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*/
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public void setScrollPosition (int x, int y)
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{
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// According to the JCL we throw a NullPointerException if there
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// is no child.
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if (ncomponents == 0)
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throw new NullPointerException ("no child in ScrollPane");
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Dimension child_d = component[0].getPreferredSize ();
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Dimension our_d = getViewportSize ();
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int xmax = Math.max (0, child_d.width - our_d.width);
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int ymax = Math.max (0, child_d.height - our_d.height);
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if (x < 0)
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x = 0;
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else if (x > xmax)
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x = xmax;
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if (y < 0)
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y = 0;
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else if (y > ymax)
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y = ymax;
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ScrollPanePeer spp = (ScrollPanePeer) peer;
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spp.setScrollPosition (x, y);
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}
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/** Sets the scroll position for this ScrollPane. If the point if
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* out of range it is silently moved within range.
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* @param p The new point
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*/
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public void setScrollPosition (Point p)
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{
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setScrollPosition (p.x, p.y);
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}
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class ScrollPaneAdjustable implements Adjustable
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{
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AdjustmentListener listeners;
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int orient;
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int unit;
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int block;
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int value;
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public ScrollPaneAdjustable (int orient)
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{
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this.orient = orient;
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}
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public void addAdjustmentListener (AdjustmentListener l)
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{
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listeners = AWTEventMulticaster.add (listeners, l);
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}
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public int getBlockIncrement ()
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{
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return block;
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}
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public int getMaximum ()
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{
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Dimension child_d = component[0].getPreferredSize ();
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Dimension our_d = getViewportSize ();
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int xmax = Math.max (0, child_d.width - our_d.width);
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int ymax = Math.max (0, child_d.height - our_d.height);
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return (orient == Adjustable.HORIZONTAL) ? xmax : ymax;
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}
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public int getMinimum ()
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{
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return 0;
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}
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public int getOrientation ()
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{
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return orient;
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}
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public int getUnitIncrement ()
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{
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return unit;
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}
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public int getValue ()
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{
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return value;
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}
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public int getVisibleAmount ()
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{
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Dimension d = getViewportSize ();
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return (orient == Adjustable.HORIZONTAL) ? d.width : d.height;
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}
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public void removeAdjustmentListener (AdjustmentListener l)
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{
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listeners = AWTEventMulticaster.remove (listeners, l);
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}
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public void setBlockIncrement (int b)
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{
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block = b;
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if (peer != null)
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{
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ScrollPanePeer spp = (ScrollPanePeer) peer;
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spp.setBlockIncrement (this, b);
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}
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}
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public void setMaximum (int max)
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{
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throw new AWTError ("can't use setMaximum on this Adjustable");
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}
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public void setMinimum (int min)
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{
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throw new AWTError ("can't use setMinimum on this Adjustable");
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}
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public void setUnitIncrement (int u)
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{
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unit = u;
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if (peer != null)
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{
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ScrollPanePeer spp = (ScrollPanePeer) peer;
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spp.setUnitIncrement (this, u);
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}
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}
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public void setValue (int v)
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{
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value = v;
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if (peer != null)
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{
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ScrollPanePeer spp = (ScrollPanePeer) peer;
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spp.setValue (this, v);
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}
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}
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public void setVisibleAmount (int v)
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{
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throw new AWTError ("can't use setVisibleAmount on this Adjustable");
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}
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}
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ScrollPaneAdjustable hscroll
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= new ScrollPaneAdjustable (Adjustable.HORIZONTAL);
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ScrollPaneAdjustable vscroll
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= new ScrollPaneAdjustable (Adjustable.VERTICAL);
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int policy;
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}
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