com.sencha.gxt.access.client.FocusHandler Maven / Gradle / Ivy
/**
* Ext GWT 3.0.0-beta3 - Ext for GWT
* Copyright(c) 2007-2011, Sencha, Inc.
* [email protected]
*
* http://sencha.com/license
*/
package com.sencha.gxt.access.client;
import com.google.gwt.user.client.Event.NativePreviewEvent;
import com.google.gwt.user.client.ui.Widget;
import com.sencha.gxt.widget.core.client.Component;
import com.sencha.gxt.widget.core.client.ComponentManager;
import com.sencha.gxt.widget.core.client.container.Container;
import com.sencha.gxt.widget.core.client.form.Field;
/**
* Abstract base class for classes that know how to handle navigation key events
* for a given widget.
*/
public abstract class FocusHandler {
protected static boolean managed;
// @SuppressWarnings({"unchecked", "rawtypes"})
public static boolean focusNextWidget(Widget c) {
// if (c instanceof Component) {
// Component comp = (Component) c;
// if (forwardIfOverride(comp)) {
// return true;
// }
// }
// Widget p = c.getParent();
//
// List widgets = null;
//
// NavigationHandler handler = null;
// if (p instanceof Component) {
// handler = findNavigationHandler((Component) p);
// }
// if (handler != null) {
// widgets = handler.getOrderedWidgets(p);
// } else if (p instanceof Container) {
// Container con = (Container) p;
// widgets = con.getItems();
// } else if (p instanceof HasWidgets) {
// HasWidgets hs = (HasWidgets) p;
// widgets = new ArrayList();
// Iterator it = hs.iterator();
// while (it.hasNext()) {
// widgets.add(it.next());
// }
// }
// if (widgets == null || widgets.size() == 1) {
// return false;
// }
// int idx = widgets.indexOf(c);
// if (idx != -1) {
// idx = idx == widgets.size() - 1 ? 0 : ++idx;
// return focusWidget(widgets.get(idx));
// }
return false;
}
public static boolean focusPreviousWidget(Widget c) {
// if (c instanceof Component) {
// Component comp = (Component) c;
// if (previousIfOverride(comp)) {
// return true;
// }
// }
//
// Widget w = findPreviousWidget(c);
// if (w != null) {
// return focusWidget(w, false);
// }
return false;
}
public static boolean focusWidget(Widget w) {
return focusWidget(w, true);
}
public static boolean focusWidget(Widget w, boolean forward) {
if (w instanceof Component) {
Component c = (Component) w;
if (c instanceof Field) {
c.focus();
return true;
}
if (c.getFocusSupport().isIgnore()) {
if (isContainer(c)) {
stepInto(c, null, forward);
} else {
if (forward) {
return focusNextWidget(c);
} else {
return focusPreviousWidget(c);
}
}
} else {
c.focus();
return true;
}
} else {
w.getElement().focus();
return true;
}
return false;
}
public static boolean isContainer(Widget w) {
// if (w instanceof LayoutContainer || w instanceof Panel) {
// return true;
// }
return false;
}
public static boolean isManaged() {
return FocusManager.get().isManaged();
}
public static void stepInto(Widget w, NativePreviewEvent pe, boolean forward) {
// NavigationHandler handler = findNavigationHandler((Component) w);
// if (handler != null) {
// List widgets = handler.getOrderedWidgets(w);
// if (widgets.size() > 0) {
// if (pe != null) pe.stopEvent();
// focusWidget(widgets.get(0));
// return;
// }
// }
// if (w instanceof ContentPanel) {
// if (pe != null) pe.stopEvent();
// ContentPanel panel = (ContentPanel) w;
// if (panel.getTopComponent() != null) {
// focusWidget(panel.getTopComponent());
// return;
// }
// }
// if (w instanceof LayoutContainer || w instanceof HtmlContainer) {
// if (pe != null) pe.stopEvent();
// Container c = (Container) w;
// if (c.getItemCount() > 0) {
// focusWidget(forward ? c.getItem(0) : c.getItem(c.getItemCount() - 1));
// }
// } else if (w instanceof ComplexPanel) {
// if (pe != null) pe.stopEvent();
// ComplexPanel panel = (ComplexPanel) w;
// if (panel.getWidgetCount() > 0) {
// focusWidget(panel.getWidget(0));
// }
// }
}
protected static Widget findForwardOverride(Component comp) {
if (comp.getFocusSupport().getNextId() != null) {
String id = comp.getFocusSupport().getNextId();
Component p = ComponentManager.get().get(id);
if (p != null) {
return p;
}
}
// if (comp.getFocusSupport().hasListeners(FocusManager.TabNext)) {
// if (comp.getFocusSupport().fireEvent(FocusManager.TabNext)) {
// return comp;
// }
// }
return null;
}
protected static NavigationHandler findNavigationHandler(Component comp) {
return FocusManager.get().findNavigationHandler(comp);
}
// @SuppressWarnings({"rawtypes", "unchecked"})
protected static Widget findNextWidget(Widget c) {
// if (c instanceof Component) {
// Component comp = (Component) c;
// if (findForwardOverride(comp) != null) {
// return findForwardOverride(comp);
// }
// }
// Widget p = c.getParent();
//
// List widgets = null;
//
// NavigationHandler handler = null;
// if (p instanceof Component) {
// handler = findNavigationHandler((Component) p);
// }
// if (handler != null) {
// widgets = handler.getOrderedWidgets(p);
// } else if (p instanceof Container) {
// Container con = (Container) p;
// widgets = con.getItems();
// } else if (p instanceof HasWidgets) {
// HasWidgets hs = (HasWidgets) p;
// widgets = new ArrayList();
// Iterator it = hs.iterator();
// while (it.hasNext()) {
// widgets.add(it.next());
// }
// }
// if (widgets == null) {
// return null;
// }
// int idx = widgets.indexOf(c);
// if (idx != -1) {
// Widget w = null;
// if (idx == widgets.size() - 1 && widgets.size() > 1) {
// w = widgets.get(0);
// } else if (idx != widgets.size() - 1) {
// w = widgets.get(idx + 1);
//
// }
// if (isIgnore(w)) {
// return findNextWidget(w);
// }
// return w;
// }
return null;
}
protected static Widget findPreviousOverride(Component comp) {
// if (comp.getFocusSupport().getPreviousId() != null) {
// String id = comp.getFocusSupport().getPreviousId();
// if ("parent-previous".equals(id)) {
// Widget p = comp.getParent();
// return p;
// }
// Component p = ComponentManager.get().get(id);
// if (p != null) {
// return p;
// }
// }
// if (comp.getFocusSupport().hasListeners(FocusManager.TabPrevious)) {
// if (comp.getFocusSupport().fireEvent(FocusManager.TabPrevious)) {
// return comp;
// }
// }
return null;
}
// @SuppressWarnings({"unchecked", "rawtypes"})
protected static Widget findPreviousWidget(Widget c) {
// if (c instanceof Component) {
// Component comp = (Component) c;
// if (findPreviousOverride(comp) != null) {
// return findPreviousOverride(comp);
// }
// }
// Widget p = c.getParent();
//
// List widgets = null;
//
// NavigationHandler handler = p instanceof Component ? findNavigationHandler((Component) p) : null;
// if (handler != null) {
// widgets = handler.getOrderedWidgets(p);
// } else if (p instanceof Container) {
// Container con = (Container) p;
// widgets = con.getItems();
// } else if (p instanceof HasWidgets) {
// HasWidgets hs = (HasWidgets) p;
// widgets = new ArrayList();
// Iterator it = hs.iterator();
// while (it.hasNext()) {
// widgets.add(it.next());
// }
// }
// if (widgets == null) {
// return null;
// }
// int size = widgets.size();
// int idx = widgets.indexOf(c);
// if (idx != -1) {
// if (idx > 0) {
// return widgets.get(idx - 1);
// } else if (idx != 0 && size > 1) {
// return widgets.get(size - 1);
// } else if (idx == 0 && size > 1) {
// return widgets.get(size - 1);
// }
// }
return null;
}
protected static boolean forwardIfOverride(Component comp) {
Widget c = findForwardOverride(comp);
if (c != null) {
focusWidget(c);
return true;
}
return false;
}
protected static boolean isIgnore(Widget w) {
if (w instanceof Component) {
Component c = (Component) w;
if (c.getFocusSupport().isIgnore()) {
return true;
}
}
return false;
}
protected static boolean previousIfOverride(Component comp) {
Widget c = findPreviousOverride(comp);
if (c != null) {
focusWidget(c, false);
return true;
}
return false;
}
/**
* Return true if this handler can handle key events for the given component.
*
* @param component the target component
* @param pe the preview event
* @return true if can handle
*/
public abstract boolean canHandleKeyPress(Component component, NativePreviewEvent pe);
public void onEnter(Component component, NativePreviewEvent pe) {
}
public void onEscape(Component component, NativePreviewEvent pe) {
if (!isManaged()) return;
stepOut(component);
}
public void onLeft(Component component, NativePreviewEvent pe) {
}
public void onRight(Component component, NativePreviewEvent pe) {
}
public void onTab(Component component, NativePreviewEvent pe) {
}
protected int firstActive(Container c) {
// for (int i = 0; i < c.getWidgetCount(); i++) {
// Component comp = c.getItem(i);
// if (!comp.isEnabled() || comp.getFocusSupport().isIgnore()) {
// continue;
// }
// return i;
// }
return -1;
}
protected int lastActive(Container c) {
for (int i = c.getWidgetCount() - 1; i >= 0; i--) {
// Component comp = c.getItem(i);
// if (!comp.isEnabled() || comp.getFocusSupport().isIgnore()) {
// continue;
// }
// return i;
}
return -1;
}
protected void stepOut(Widget w) {
// Widget p = w.getParent();
// if (p != null) {
// if (p instanceof TabItem) {
// ((TabItem) p).getTabPanel().focus();
// } else if (p instanceof Component) {
// Component c = (Component) p;
// while (c.getFocusSupport().isIgnore()) {
// p = c.getParent();
// if (p != null) {
// if (p instanceof Component) {
// c = (Component) p;
// } else {
// El.fly(p.getElement()).focus();
// return;
// }
// }
// }
// focusWidget(c);
// } else {
// El.fly(p.getElement()).focus();
// FocusFrame.get().unframe();
// }
// }
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy