BaseExtWidget.java

/*
 Copyright (c) 2014 Ahomé Innovation Technologies. All rights reserved.

 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.ait.toolkit.sencha.ext.client.core;

import com.ait.toolkit.sencha.shared.client.dom.ExtElement;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.dom.client.Element;
import com.google.gwt.user.client.ui.Widget;

/**
 * Base abstract Widget class.
 */
public abstract class BaseExtWidget extends Widget {

	protected JavaScriptObject jsObj;

	protected BaseExtWidget() {
	}

	protected BaseExtWidget(JavaScriptObject jsObj) {
		this.jsObj = jsObj;
		setElement(getElement(this.jsObj));
	}

	public JavaScriptObject getJsObj() {
		return jsObj;
	}

	public void setJsObj(JavaScriptObject jsObj) {
		this.jsObj = jsObj;
	}

	public ExtElement getEl() {
		if (jsObj == null || getElement() == null) {
			return null;
		} else {
			return new ExtElement(getElement());
		}
	}

	// jsObj is JS object representing the UI Widget
	// jsObj.el is the ExtElement of the Widget
	// jsObj.el.dom is the DOM Element of the widget
	protected native Element getElement(JavaScriptObject jsObj) /*-{
		//var el = jsObj.el;
		var el = jsObj.getEl().dom;
		if (el == null || el === undefined) {
			return null;
			//forms buttons are detached when initially added
			//throw new Error('Widget ' + jsObj + ' has no element property set');
		} else {
			//There's an inconsistency in Ext where most elements have the property 'el' set to Ext's Element
			//with the exception of Menu->Item, Menu->Separator, Menu->TextItem,  Toolbar.Item and subclasses
			//(Toolbar.Separator, Toolbar.Spacer, Toolbar.TextItem) where the 'el' property is set to
			//the DOM element itself. Therefore retruning 'el' if 'el' is not Ext's Element. See details in issue 39.
			return el.dom || el;
		}
	}-*/;

	protected void onLoad() {
		if (getElement() == null) {
			setElement(getElement(jsObj));
		}
	}

	protected void onAttach() {
		super.onAttach();
	}

	/*
	 * protected void onAttach() { super.onAttach(); Widget parent =
	 * getParent(); if(!isRendered()) { render(parent.getElement()); }
	 * 
	 * }
	 */
	/*
	 * public Element getElement() { if (super.getElement() == null) {
	 * if(!isRendered()) { render(parent.getElement()); }
	 * setElement(getElement(jsObj)); } return super.getElement(); }
	 */

	public int getOffsetHeight() {
		return getElement().getPropertyInt("offsetHeight");
	}

	public int getOffsetWidth() {
		return getElement().getPropertyInt("offsetWidth");
	}

	public String getTitle() {
		return getElement().getPropertyString("title");
	}

	public boolean isVisible() {
		return isVisible(getElement());
	}

	public native void purgeListeners() /*-{
		var widget = this.@com.ait.toolkit.sencha.ext.client.core.Component::getJsObj()();
		widget.purgeListeners();
	}-*/;

	public void setHeight(String height) {
		// This exists to deal with an inconsistency in IE's implementation
		// where
		// it won't accept negative numbers in length measurements
		assert extractLengthValue(height.trim().toLowerCase()) >= 0 : "CSS heights should not be negative";
		getElement().getStyle().setProperty("height", height);
	}

	private native double extractLengthValue(String s) /*-{
		if (s == "auto" || s == "inherit" || s == "") {
			return 0;
		} else {
			return parseFloat(s);
		}
	}-*/;

	public void setTitle(String title) {
		if (title == null || title.length() == 0) {
			getElement().removeAttribute("title");
		} else {
			getElement().setAttribute("title", title);
		}
	}

	public void setVisible(boolean visible) {
		setVisible(getElement(), visible);
	}

	public void setWidth(String width) {
		// This exists to deal with an inconsistency in IE's implementation
		// where
		// it won't accept negative numbers in length measurements
		assert extractLengthValue(width.trim().toLowerCase()) >= 0 : "CSS widths should not be negative";
		getElement().getStyle().setProperty("width", width);
	}

	public boolean equals(Object obj) {
		if (obj instanceof BaseExtWidget) {
			return getElement().equals(((BaseExtWidget) obj).getElement());
		} else {
			return false;
		}
	}

	public int hashCode() {
		return getElement().hashCode();
	}

	public String toString() {
		return "element";
		/*
		 * if (getElement() == null) { return "(null handle)"; } return
		 * DOM.toString(getElement());
		 */
	}
}