I don't know what gwt-fabridge is, but maybe that project has it's own
support list you can use for issues such as this? Not sure you will
get much response here.
On Feb 3, 4:00 pm, "Jihong Liu" <jihong....@satmetrix.com> wrote:
> Hi. I have a problem for gwt-fabridge. I think it may be a critical
> issue for gwt-fabridge.
>
> If a swf widget is added into a panel, and then add the panel into a
> container. And then remove the panel from the container, and then add
> the panel back into the container. Then the Null pointer error will
> occur at onInitialization()caused by the swf widget. I did a test using
> the FABridgeDemo. In the FABridgeDemo, I added a button for removing the
> swf widget.
>
> When start the program, first click the "Add new SWF", and everything is
> ok. Then click the "Remove SWF", then the swf is removed. Then click the
> "Add new SWF" again, then an error will happen.
>
> I have tried many ways, the only way to make it work is to create the
> swf widge again and using a different name if the widget has been
> removed. For example:
>
> java.util.Date date = new java.util.Date();
>
> swfWidget = new
> SWFABridgeWidget("app.swf",400,400,"example"+date.getTime());
>
> But it is not good at all. And the behavior is not the same as other
> regular gwt widgets. For other widgets, after they are put in a panel.
> Then you can add/drop this panel into/from a container many times
> without re-create the inside widgets.
>
> I am really frustrated about this problem. Based on user's selection we
> will add different panels into a container for display. It is really
> painful if we have to create the swf widgets again if the panel has been
> dropped from the container once.
>
> I don't know whether the following code in
> pl.rmalinowski.gwt2swf.client.ui.SWFWidge causes problem or not.
>
> protected void onUnload() {
>
> // GWT.log("onUnload", null);
>
> getElement().removeChild(DOM.getFirstChild(getElement()));
>
> isSWFInjected = false;
>
> super.onUnload();
>
> }
>
> The statement: getElement().removeChild(DOM.getFirstChild(getElement()))
> removes the child from the widget. Thus after a swfwidget is removed
> from a panel, and then add the swf back, no child there.
>
> Following is the code in com.google.gwt.user.client.ui.ComplexPanel
>
> @Override
>
> public boolean remove(Widget w) {
>
> // Validate.
>
> if (w.getParent() != this) {
>
> return false;
>
> }
>
> // Orphan.
>
> orphan(w);
>
> // Physical detach.
>
> Element elem = w.getElement();
>
> DOM.removeChild(DOM.getParent(elem), elem);
>
> // Logical detach.
>
> getChildren().remove(w);
>
> return true;
>
> }
>
> It sounds to me that the different between two programs is that in
> ComplexPanel, it removes the widget's element only, but in SWFWidge, it
> removes the child of the widget's element.
>
> Thank you very much!
>
> Jihong Liu
>
> Following is the source code which causes problem
>
> package com.satmetrix.swfTest.client;
>
> import org.argunet.gwt.fabridge.client.SWFABridgeWidget;
>
> import org.argunet.gwt.fabridge.client.bridge.BridgeObject;
>
> import org.argunet.gwt.fabridge.client.bridge.BridgeParameter;
>
> import org.argunet.gwt.fabridge.client.bridge.BridgeParameterObject;
>
> import org.argunet.gwt.fabridge.client.events.IInitializationListener;
>
> import org.argunet.gwt.fabridge.client.events.ISWFListener;
>
> import org.argunet.gwt.fabridge.client.utils.JSNIUtils;
>
> import com.google.gwt.core.client.EntryPoint;
>
> import com.google.gwt.core.client.JavaScriptObject;
>
> import com.google.gwt.user.client.Window;
>
> import com.google.gwt.user.client.ui.Button;
>
> import com.google.gwt.user.client.ui.ClickListener;
>
> import com.google.gwt.user.client.ui.Label;
>
> import com.google.gwt.user.client.ui.RootPanel;
>
> import com.google.gwt.user.client.ui.Widget;
>
> public class FABridgeDemo implements EntryPoint, IInitializationListener
> {
>
> private final Button addNewSwf = new Button("Add new SWF");
>
> private final Button removeSwf = new Button("Remove SWF");
>
> private final Button setCheckBox = new Button("Set Checkbox
> property");
>
> private final Label sliderLabel = new Label("Slider Label");
>
> private SWFABridgeWidget swfWidget=null;
>
> private final Button createDataGrid = new Button("Create Data
> Grid");
>
> /**
>
> * This is the entry point method.
>
> */
>
> public void onModuleLoad() {
>
> RootPanel.get().add(addNewSwf);
>
> RootPanel.get().add(removeSwf);
>
> RootPanel.get().add(setCheckBox);
>
> RootPanel.get().add(sliderLabel);
>
> RootPanel.get().add(createDataGrid);
>
> // adds new swfWidget to rootPanel
>
> addNewSwf.addClickListener(new ClickListener() {
>
> public void onClick(Widget arg0) {
>
> // set bridge name for FABridge
>
> if (swfWidget==null) {
>
> swfWidget = new
> SWFABridgeWidget("app.swf",400,400,"example");
>
> // add initialization listener
>
> swfWidget.addInitializationListener(FABridgeDemo.this);
>
> }
>
> // add swfWidget to RootPanel
>
> RootPanel.get().add(swfWidget);
>
> //show swf movie
>
> swfWidget.show();
>
> }
>
> });
>
> removeSwf.addClickListener(new ClickListener() {
>
> public void onClick(Widget arg0) {
>
> RootPanel.get().remove(swfWidget);
>
> }
>
> });
>
> // changes checkbox status in swfWidget
>
> setCheckBox.addClickListener(new ClickListener() {
>
> public void onClick(Widget arg0) {
>
> // get check box
>
> BridgeObject check =
> swfWidget.root().getObject("check");
>
> // get check box status
>
> Boolean status = new
> Boolean(check.getProperty("selected").getContent().toString());
>
> // change check box status
>
> check.setProperty("selected",
> !status.booleanValue());
>
> }
>
> });
>
> // creates new DataGrid in swfWidget
>
> createDataGrid.addClickListener(new ClickListener() {
>
> public void onClick(Widget arg0) {
>
> BridgeObject flexApp = swfWidget.root();
>
> // create new data grid
>
> BridgeObject grid =
> swfWidget.create("mx.controls.DataGrid");
>
> grid.addRef();
>
> // create first column
>
> BridgeObject col1 =
> swfWidget.create("mx.controls.dataGridClasses.DataGridColumn");
>
> col1.addRef();
>
> col1.setProperty("dataField", "apples");
>
> // create second column
>
> BridgeObject col2 =
> swfWidget.create("mx.controls.dataGridClasses.DataGridColumn");
>
> col2.addRef();
>
> col2.setProperty("dataField", "oranges");
>
> // add columns to data grid
>
> JavaScriptObject jsArray = JSNIUtils
>
> .convertArray(new JavaScriptObject[]
> {
>
> col1.getJSContent(),
> col2.getJSContent() });
>
> grid.setProperty("columns", jsArray);
>
> grid.setProperty("width", 300);
>
> // create first row
>
> BridgeParameterObject row1 = new
> BridgeParameterObject();
>
> row1.addProperty("apples", 12);
>
> row1.addProperty("oranges", 32);
>
> // create second row
>
> BridgeParameterObject row2 = new
> BridgeParameterObject();
>
> row2.addProperty("apples", 15);
>
> row2.addProperty("oranges", 24);
>
> // set dataProvider
>
> grid.setProperty("dataProvider", JSNIUtils
>
> .convertArray(new JavaScriptObject[]
> {
>
> row1.getObject(),
> row2.getObject() }));
>
> // add grid to panel
>
> BridgeParameter params = new BridgeParameter();
>
> params.addParameter(grid.getJSContent());
>
> flexApp.getObject("panel").invokeMethod("addChild",params.getParameter()
> );
>
> }
>
> });
>
> }
>
> /**
>
> * Gets called after the swf has been initalized.
>
> */
>
> public void onInitialization() {
>
> // get width of the swf
>
> Object width =
> swfWidget.root().getProperty("width").getContent();
>
> Integer test = new Integer(width.toString());
>
> Window.alert("Swf Initialized. Width: " + test);
>
> // add click listener to flex button
>
> swfWidget.root().getObject("button").addEventListener("click",
>
> new ISWFListener() {
>
> public void onSWFEvent(JavaScriptObject
> event) {
>
> Window.alert("Hello, GWT! Love,
> Actionscript...");
>
> }
>
> });
>
> // add change listener to flex slider
>
> swfWidget.root().getObject("slider").addEventListener("change",
>
> new ISWFListener() {
>
> public void onSWFEvent(JavaScriptObject
> event) {
>
> // wrap event object into bridge
> object
>
> BridgeObject e = new
> BridgeObject(event);
>
> // get slider value from event
> object
>
> sliderLabel.setText(e.getProperty("value").getContent().toString());
>
> }
>
> });
>
> }
>
> }
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