Hi,
I'm currently migrating from GWT 1.4 to 2.0 and am changing
from Listener to Handler from class to class. I've found the
following problem with a TextBox/Label-combination. Here
some code:
// this part is inside a method building a row in a table,
// index is the row-number being passed as parameter
final Label receiverLabel = new Label(recipientAddress);
final TextBox receiverValue = new TextBox();
receiverValue.addKeyPressHandler(new KeyPressHandler() {
public void onKeyPress(KeyPressEvent event) {
switch(event.getCharCode()){
case KeyCodes.KEY_ENTER:{
GWT.log("key enter pressed, confirm");
confirmParameterValue(receiverLabel, receiverValue, index);
break;
}
case KeyCodes.KEY_ESCAPE:{
GWT.log("key cancel pressed, cancelling");
cancelParameterValue(receiverLabel, receiverValue, index);
break;
}
}
}
});
receiverValue.addBlurHandler(new BlurHandler() {
public void onBlur(BlurEvent sender) {
GWT.log("on blur, confirming");
confirmParameterValue(receiverLabel, receiverValue, index);
}
});
private void confirmParameterValue(Label oldName, TextBox newName, int index){
GWT.log("confirm " + newName.getText() + " to " + oldName.getText());
oldName.setText(newName.getText());
GWT.log("confirmed name is now " + oldName.getText());
// call cancel to perform the change in the GUI, values
// are equal now, so this is not a problem
cancelParameterValue(oldName, newName, index);
}
private void cancelParameterValue(Label oldName, TextBox newName, int index){
GWT.log("cancel " + newName.getText() + " back to " + oldName.getText());
newName.setText(oldName.getText());
newName.setVisible(false);
oldName.setVisible(true);
GWT.log("cancelled name is now " + oldName.getText() + "/" +
newName.getText());
}
In the plugin (I haven't tried it with a deployed application, yet)
I receive the following outputs in the message-pane, if I enter
"1" into the TextBox, pressing enter, reenter "1_2"
in that TextBox and press ESCAPE:
00:25:59,713 [INFO] key enter pressed, confirm
00:25:59,718 [INFO] confirm 1 to
00:25:59,719 [INFO] confirmed name is now 1
00:25:59,729 [INFO] cancel 1 back to 1
00:25:59,736 [INFO] cancelled name is now 1/1
00:26:01,410 [INFO] on blur, confirming
00:26:01,415 [INFO] confirm 1 to 1
00:26:01,420 [INFO] confirmed name is now 1
00:26:01,421 [INFO] cancel 1 back to 1
00:26:01,426 [INFO] cancelled name is now 1/1
00:26:07,089 [INFO] key cancel pressed, cancelling
00:26:07,089 [INFO] cancel 1_2 back to 1
00:26:07,097 [INFO] cancelled name is now 1/1
00:26:08,849 [INFO] on blur, confirming
00:26:08,853 [INFO] confirm 1_2 to 1
00:26:08,853 [INFO] confirmed name is now 1_2
00:26:08,853 [INFO] cancel 1_2 back to 1_2
00:26:08,854 [INFO] cancelled name is now 1_2/1_2
Messages 00:26:07,089 and 00:26:08,853 confuse me. Both are
working with the same instances of TextBox and Label, so why
is there still the value "1_2" in newName in onBlur after
being set to "1" in cancelParameterValue?
The whole thing worked in GWT 1.4 using onLostFocus
and onKeyPressed. Of course I can introduce a boolean
being checked in onBlur but if this is a bug, it would
be a very ugly workaround for something that should be
fixed in my eyes.
Used version: GWT SDK Bundle 2.0.3.v201002191036 running
the Browser plugin for Firefox 3.6.2
Best regards, Lothar
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