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/*
* Copyright 2000-2016 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.client;
import com.google.gwt.dom.client.Element;
import com.google.gwt.user.client.ui.Widget;
import com.vaadin.shared.AbstractComponentState;
/**
* An interface used by client-side widgets or paintable parts to receive
* updates from the corresponding server-side components in the form of
* {@link UIDL}.
*
* Updates can be sent back to the server using the
* {@link ApplicationConnection#updateVariable()} methods.
*/
public interface ComponentConnector extends ServerConnector {
/*
* (non-Javadoc)
*
* @see com.vaadin.client.VPaintable#getState()
*/
@Override
public AbstractComponentState getState();
/**
* Returns the widget for this {@link ComponentConnector}
*/
public Widget getWidget();
public LayoutManager getLayoutManager();
/**
* Returns true if the width of this paintable is currently
* undefined. If the width is undefined, the actual width of the paintable
* is defined by its contents.
*
* @return true if the width is undefined, else
* false
*/
public boolean isUndefinedWidth();
/**
* Returns true if the height of this paintable is currently
* undefined. If the height is undefined, the actual height of the paintable
* is defined by its contents.
*
* @return true if the height is undefined, else
* false
*/
public boolean isUndefinedHeight();
/**
* Returns true if the width of this paintable is currently
* relative. If the width is relative, the actual width of the paintable is
* a percentage of the size allocated to it by its parent.
*
* @return true if the width is undefined, else
* false
*/
public boolean isRelativeWidth();
/**
* Returns true if the height of this paintable is currently
* relative. If the height is relative, the actual height of the paintable
* is a percentage of the size allocated to it by its parent.
*
* @return true if the width is undefined, else
* false
*/
public boolean isRelativeHeight();
/**
* Return true if parent handles caption, false if the paintable handles the
* caption itself.
*
*
* This should always return true and all components should let the parent
* handle the caption and use other attributes for internal texts in the
* component
*
*
* @return true if caption handling is delegated to the parent, false if
* parent should not be allowed to render caption
*/
public boolean delegateCaptionHandling();
/**
* Sets the enabled state of the widget associated to this connector.
*
* @param widgetEnabled
* true if the widget should be enabled, false otherwise
*/
public void setWidgetEnabled(boolean widgetEnabled);
/**
* Gets the tooltip info for the given element.
*
* When overriding this method, {@link #hasTooltip()} should also be
* overridden to return true in all situations where this
* method might return a non-empty result.
*
*
* @param element
* The element to lookup a tooltip for
* @return The tooltip for the element or null if no tooltip is defined for
* this element.
*/
public TooltipInfo getTooltipInfo(Element element);
/**
* Check whether there might be a tooltip for this component. The framework
* will only add event listeners for automatically handling tooltips (using
* {@link #getTooltipInfo(Element)}) if this method returns true.
*
* This is only done to optimize performance, so in cases where the status
* is not known, it's safer to return true so that there will
* be a tooltip handler even though it might not be needed in all cases.
*
* @return true if some part of the component might have a
* tooltip, otherwise false
*/
public boolean hasTooltip();
/**
* Called for the active (focused) connector when a situation occurs that
* the focused connector might have buffered changes which need to be
* processed before other activity takes place.
*
* This is currently called when the user changes the fragment using the
* back/forward button in the browser and allows the focused field to submit
* its value to the server before the fragment change event takes place.
*
*/
public void flush();
}