Re: is there any way to trigger a method when users mouse over the Title of a column in GWT-CellTable?

Thank you Jens for your hint. I couldn't see any getConsumedEvents() so I used onBrowserEvent and it working ok.

     private class HeaderCell extends AbstractCell<String> {                private String text;                public HeaderCell(String text) {                /*                 * Let the parent class know that our cell responds to click events and                 * keydown events.                 */                //super("click", "keydown");                  super("mouseover");                   this.text=text;                }                @Override              public void onBrowserEvent(Context context, Element parent, String value,                  NativeEvent event, ValueUpdater<String> valueUpdater) {                // Check that the value is not null.                if (value == null) {                  return;                }                  // Call the super handler, which handlers the enter key.                super.onBrowserEvent(context, parent, value, event, valueUpdater);                    if ("mouseover".equals(event.getType())) {                    SafeHtmlBuilder sb=new SafeHtmlBuilder();                      sb.appendHtmlConstant("<b>");                          sb.appendHtmlConstant("<font color=\"blue\">");                      sb.appendEscaped(text);                      sb.appendHtmlConstant("</font></b>");                        meaningMessagesPopup.setWidget(new HTML(sb.toSafeHtml()));                          int left = event.getClientX() -140;                      int top = event.getClientY() +30;                      meaningMessagesPopup.setPopupPosition(left, top);                            // Show the popup                      meaningMessagesPopup.show();                }                else if ("mouseout".equals(event.getType())) {                    meaningMessagesPopup.hide();                }              }                @Override              public void render(Context context, String value, SafeHtmlBuilder sb) {                /*                 * Always do a null check on the value. Cell widgets can pass null to                 * cells if the underlying data contains a null, or if the data arrives                 * out of order.                 */                if (value == null) {                  return;                }                  sb.appendEscaped(value);              }              }  

Then

  Header<String> nameColumnHeader = new Header<String>(new HeaderCell("my Text...")) {                      @Override                      public String getValue() {                          return "Name";                      }    };    table.addColumn(nameColumn, nameColumnHeader);  

On Friday, June 13, 2014 9:10:40 AM UTC+10, Jens wrote:

ClickableTextCell only listens for click and keydown events so Header.onBrowserEvent() will never be called for mouseover events. You must create your own Cell class (possibly extending any of GWTs cells) and call the super constructor AbstractCell(String... consumedEvents) if possible or override AbstractCell.getConsumedEvents().

Also you can use BrowserEvents.MOUSEOVER as a predefined constant.

-- J.

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