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ModalEventFilter.java
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216 lines (193 loc) · 6.52 KB
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/*
* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
package java.awt;
import java.awt.event.*;
import sun.awt.AppContext;
abstract class ModalEventFilter implements EventFilter {
protected Dialog modalDialog;
protected boolean disabled;
protected ModalEventFilter(Dialog modalDialog) {
this.modalDialog = modalDialog;
disabled = false;
}
Dialog getModalDialog() {
return modalDialog;
}
public FilterAction acceptEvent(AWTEvent event) {
if (disabled || !modalDialog.isVisible()) {
return FilterAction.ACCEPT;
}
int eventID = event.getID();
if ((eventID >= MouseEvent.MOUSE_FIRST &&
eventID <= MouseEvent.MOUSE_LAST) ||
(eventID >= ActionEvent.ACTION_FIRST &&
eventID <= ActionEvent.ACTION_LAST) ||
eventID == WindowEvent.WINDOW_CLOSING)
{
Object o = event.getSource();
if (o instanceof sun.awt.ModalExclude) {
// Exclude this object from modality and
// continue to pump it's events.
} else if (o instanceof Component) {
Component c = (Component)o;
while ((c != null) && !(c instanceof Window)) {
c = c.getParent_NoClientCode();
}
if (c != null) {
return acceptWindow((Window)c);
}
}
}
return FilterAction.ACCEPT;
}
protected abstract FilterAction acceptWindow(Window w);
// When a modal dialog is hidden its modal filter may not be deleted from
// EventDispatchThread event filters immediately, so we need to mark the filter
// as disabled to prevent it from working. Simple checking for visibility of
// the modalDialog is not enough, as it can be hidden and then shown again
// with a new event pump and a new filter
void disable() {
disabled = true;
}
int compareTo(ModalEventFilter another) {
Dialog anotherDialog = another.getModalDialog();
// check if modalDialog is from anotherDialog's hierarchy
// or vice versa
Component c = modalDialog;
while (c != null) {
if (c == anotherDialog) {
return 1;
}
c = c.getParent_NoClientCode();
}
c = anotherDialog;
while (c != null) {
if (c == modalDialog) {
return -1;
}
c = c.getParent_NoClientCode();
}
// check if one dialog blocks (directly or indirectly) another
Dialog blocker = modalDialog.getModalBlocker();
while (blocker != null) {
if (blocker == anotherDialog) {
return -1;
}
blocker = blocker.getModalBlocker();
}
blocker = anotherDialog.getModalBlocker();
while (blocker != null) {
if (blocker == modalDialog) {
return 1;
}
blocker = blocker.getModalBlocker();
}
// compare modality types
return modalDialog.getModalityType().compareTo(anotherDialog.getModalityType());
}
static ModalEventFilter createFilterForDialog(Dialog modalDialog) {
switch (modalDialog.getModalityType()) {
case DOCUMENT_MODAL: return new DocumentModalEventFilter(modalDialog);
case APPLICATION_MODAL: return new ApplicationModalEventFilter(modalDialog);
case TOOLKIT_MODAL: return new ToolkitModalEventFilter(modalDialog);
}
return null;
}
private static class ToolkitModalEventFilter extends ModalEventFilter {
private AppContext appContext;
ToolkitModalEventFilter(Dialog modalDialog) {
super(modalDialog);
appContext = modalDialog.appContext;
}
protected FilterAction acceptWindow(Window w) {
if (w.isModalExcluded(Dialog.ModalExclusionType.TOOLKIT_EXCLUDE)) {
return FilterAction.ACCEPT;
}
if (w.appContext != appContext) {
return FilterAction.REJECT;
}
while (w != null) {
if (w == modalDialog) {
return FilterAction.ACCEPT_IMMEDIATELY;
}
w = w.getOwner();
}
return FilterAction.REJECT;
}
}
private static class ApplicationModalEventFilter extends ModalEventFilter {
private AppContext appContext;
ApplicationModalEventFilter(Dialog modalDialog) {
super(modalDialog);
appContext = modalDialog.appContext;
}
protected FilterAction acceptWindow(Window w) {
if (w.isModalExcluded(Dialog.ModalExclusionType.APPLICATION_EXCLUDE)) {
return FilterAction.ACCEPT;
}
if (w.appContext == appContext) {
while (w != null) {
if (w == modalDialog) {
return FilterAction.ACCEPT_IMMEDIATELY;
}
w = w.getOwner();
}
return FilterAction.REJECT;
}
return FilterAction.ACCEPT;
}
}
private static class DocumentModalEventFilter extends ModalEventFilter {
private Window documentRoot;
DocumentModalEventFilter(Dialog modalDialog) {
super(modalDialog);
documentRoot = modalDialog.getDocumentRoot();
}
protected FilterAction acceptWindow(Window w) {
// application- and toolkit-excluded windows are blocked by
// document-modal dialogs from their child hierarchy
if (w.isModalExcluded(Dialog.ModalExclusionType.APPLICATION_EXCLUDE)) {
Window w1 = modalDialog.getOwner();
while (w1 != null) {
if (w1 == w) {
return FilterAction.REJECT;
}
w1 = w1.getOwner();
}
return FilterAction.ACCEPT;
}
while (w != null) {
if (w == modalDialog) {
return FilterAction.ACCEPT_IMMEDIATELY;
}
if (w == documentRoot) {
return FilterAction.REJECT;
}
w = w.getOwner();
}
return FilterAction.ACCEPT;
}
}
}