com.extjs.gxt.ui.client.aria.DefaultHandler.java Source code

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Here is the source code for com.extjs.gxt.ui.client.aria.DefaultHandler.java

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/*
 * Sencha GXT 2.3.1 - Sencha for GWT
 * Copyright(c) 2007-2013, Sencha, Inc.
 * licensing@sencha.com
 * 
 * http://www.sencha.com/products/gxt/license/
 */
package com.extjs.gxt.ui.client.aria;

import com.extjs.gxt.ui.client.GXT;
import com.extjs.gxt.ui.client.core.El;
import com.extjs.gxt.ui.client.core.XDOM;
import com.extjs.gxt.ui.client.event.PreviewEvent;
import com.extjs.gxt.ui.client.widget.Component;
import com.extjs.gxt.ui.client.widget.Container;
import com.extjs.gxt.ui.client.widget.tips.ToolTip;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Widget;

public class DefaultHandler extends FocusHandler {

    private Element stepout;

    @Override
    public boolean canHandleKeyPress(Component component, PreviewEvent pe) {
        return true;
    }

    @Override
    public void onEnter(final Component component, final PreviewEvent pe) {
        if (!isManaged())
            return;
        Timer t = new Timer() {
            @Override
            public void run() {
                stepInto(component, pe, true);
            }
        };
        t.schedule(200);
    }

    @Override
    public void onEscape(Component component, PreviewEvent pe) {
        if (!isManaged())
            return;
        ToolTip tip = component.getToolTip();
        if (tip != null && tip.isVisible()) {
            return;
        }
        if (component.getFocusSupport().isIgnore()) {
            component.getFocusSupport().setIgnore(false);
            return;
        }
        stepOut(component);
    }

    @SuppressWarnings("rawtypes")
    @Override
    public void onTab(Component component, PreviewEvent pe) {
        if (!isManaged())
            return;

        if (component.getFocusSupport().isIgnore()) {
            return;
        }
        if (pe.isShiftKey()) {
            if (focusPreviousWidget(component)) {
                pe.stopEvent();
            } else {
                Widget w = component.getParent();
                while (w != null) {
                    if (w instanceof RootPanel) {
                        // do nothing leave app
                        return;
                    } else if (w instanceof Component) {
                        Component c = (Component) w;
                        if (c.getFocusSupport().isIgnore()) {
                            w = w.getParent();
                        } else {
                            w = null;
                            pe.stopEvent();
                        }
                    }
                }
            }
        } else {
            if (focusNextWidget(component)) {
                pe.stopEvent();
            } else {
                if (!(component.getParent() instanceof RootPanel)) {
                    Widget p = component.getParent();
                    if (p instanceof Container) {
                        Container c = (Container) p;
                        if (c.getItemCount() == 1) {
                            if (c.getParent() instanceof RootPanel) {
                                pe.stopEvent();
                                onStepOutApp();
                                return;
                            }
                        }
                    }
                    pe.stopEvent();
                } else {
                    pe.stopEvent();
                    onStepOutApp();
                }
            }
        }
    }

    protected void onStepOutApp() {
        if (FocusManager.get().isInsertExitFocusElement()) {
            if (stepout == null) {
                stepout = Document.get().createElement("div");
                stepout.setTitle(GXT.MESSAGES.aria_leaveApplication());
                stepout.getStyle().setProperty("outline", "none");
                El.fly(stepout).setTabIndex(0);
                Element body = XDOM.getBody();
                body.appendChild(stepout);
            }
            El.fly(stepout).focus();
        }
    }

}