+++ /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 gnu.awt;
-
-import java.awt.AWTEvent;
-import java.awt.AWTError;
-import java.awt.Component;
-import java.awt.Container;
-import java.awt.event.MouseEvent;
-import java.awt.event.InputEvent;
-
-/**
- * Encapsulates the logic required to dispatch events to the correct
- * component in a component tree that may contain lightweight
- * components. Toolkits typically only identify heavyweight components
- * as the source of events. This class redirects the events to the
- * appropriate lightweight children of the heavyweight component.
- */
-public class LightweightRedirector
-{
- final static int LAST_BUTTON_NUMBER = 3;
-
- /* We sacrifice one array element to allow the button number to
- match the index of this array. */
- Component[] releaseTargets = new Component[LAST_BUTTON_NUMBER+1];
-
- /**
- *
- * Modifies or replaces the given event with an event that has been
- * properly redirected. State of button presses are kept so that
- * button releases can be redirected to the same component as the
- * button press. It is required that all events are sent through
- * this method in chronological order.
- */
- public AWTEvent redirect(AWTEvent event)
- {
- if (event instanceof MouseEvent)
- return redirectMouse((MouseEvent) event);
-
- /* In case we don't know how to redirect the event, simply return
- the event unchanged. */
- return event;
- }
-
- MouseEvent redirectMouse(MouseEvent event)
- {
- int button = getButtonNumber(event);
- int id = event.getID();
-
- Component heavySource = (Component) event.getSource();
- Component source = heavySource;
- int x = event.getX();
- int y = event.getY();
-
- if (id == MouseEvent.MOUSE_RELEASED)
- {
- Component target = releaseTargets[button];
-
- if (target != null)
- {
- releaseTargets[button] = null;
- source = target;
-
- Component child = source;
- while (child != heavySource)
- {
- x -= child.getX();
- y -= child.getY();
- child = child.getParent();
- if (child == null)
- System.err.println("warning, orphaned release target");
- }
- }
- }
- else
- {
- /* Find real component, and adjust source, x and y
- accordingly. */
-
- while (true)
- {
- Component parent = source;
-
- Component child = parent.getComponentAt(x, y);
-
- if (parent == child)
- break;
-
- // maybe ignoring would be better?
- if (child == null)
- {
- String msg = "delivered event not within component. " +
- "Heavyweight source was " + heavySource + ". " +
- "Component was " + parent;
- throw new AWTError(msg);
- }
- if (child.isLightweight())
- {
- // descend down to child
- source = child;
- x -= child.getX();
- y -= child.getY();
- }
- else
- {
- System.err.println("warning: event delivered to wrong " +
- "heavyweight component. Was " +
- "delivered to " + source + ". " +
- "Should have been delivered to " +
- child + ". Maybe the native window " +
- "system is bubbling events up the " +
- "containment hierarchy.");
- break;
- }
- }
-
- /* ensure that the release event is delivered to the same
- component as the press event. For most toolkits this is
- only necessary for lightweight components, since the
- underlying windowing system takes care of its heavyweight
- components. */
- if (id == MouseEvent.MOUSE_PRESSED)
- releaseTargets[button] = source;
- }
-
-
- if (source == heavySource)
- return event; // no change in event
-
- // print warning for heavyweights
- /* this warning can safely be removed if a toolkit that
- needs heavyweight redirection support is ever created. */
- if (!source.isLightweight())
- System.err.println("warning: redirecting to heavyweight");
-
- MouseEvent redirected = new MouseEvent(source, event.getID(),
- event.getWhen(),
- event.getModifiers(),
- x, y,
- event.getClickCount(),
- event.isPopupTrigger());
-
- return redirected;
- }
-
- /**
- * Identifies the button number for an input event.
- *
- * @returns the button number, or 0 if no button modifier was set
- * for the event.
- */
- int getButtonNumber(InputEvent event)
- {
- int modifiers = event.getModifiers();
-
- modifiers &=
- InputEvent.BUTTON1_MASK |
- InputEvent.BUTTON2_MASK |
- InputEvent.BUTTON3_MASK;
-
- switch (modifiers)
- {
- case InputEvent.BUTTON1_MASK:
- return 1;
- case InputEvent.BUTTON2_MASK:
- return 2;
- case InputEvent.BUTTON3_MASK:
- return 3;
- case 0:
- return 0;
-
- default:
- System.err.println("FIXME: multibutton event");
- return 0;
- }
- }
-}
projects / msp430-gcc.git / blobdiff