GWT PopupPanel just appearing once - gwt

I`m using GWT-Popup-Panel with the following code:
private static class MyPopup extends PopupPanel {
public MyPopup() {
// PopupPanel's constructor takes 'auto-hide' as its boolean parameter.
// If this is set, the panel closes itself automatically when the user
// clicks outside of it.
super(true);
// PopupPanel is a SimplePanel, so you have to set it's widget property to
// whatever you want its contents to be.
setWidget(new Label("Click outside of this popup to close it"));
}
}
public void onModuleLoad() {
final Button b1 = new Button("About");
b1.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
final MyPopup g = new MyPopup();
g.setWidget(RootPanel.get("rightagekeyPanel"));
g.setPopupPositionAndShow(new PopupPanel.PositionCallback() {
public void setPosition(int offsetWidth, int offsetHeight) {
g.setPopupPosition(b1.getAbsoluteLeft(), b1.getAbsoluteTop());
g.setAutoHideEnabled(true);
}
});
g.setVisible(true);
g.setWidth("500px");
g.setHeight("500px");
g.show();
}
});
It does appear when clicking Button b1, but not when clicking it the second time. What is wrong?

Make one popup, outside of your ClickHandler, at the same level as your Button. You also don't need that PositionCallback to center your popup. You can just call g.center() to show it and center it. It's a known issue on the GWT support pages that it won't center properly if you don't set a width to it. It will center properly if you give your popup a proper width.
The reason it doesn't show again is because you remove the widget inside RootPanel.get("rightagekeyPanel") and put it into your popup. It is no longer there the next time you try to do it.
A widget can only be in one place at a time, so if you remove it from its parent, keep track of it with a variable or something, so you can re-use it. Otherwise, you must re-instantiate the widget.
public void onModuleLoad() {
final Button b1 = new Button("About");
final MyPopup g = new MyPopup(); //create only one instance and reuse it.
g.setAutoHideEnabled(true);
g.setSize("500px", "500px"); //sets width AND height
b1.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
g.setWidget(RootPanel.get("rightagekeyPanel"));//DON'T DO THIS.
g.center();//will show it and center it.
}
});
}

Just say in my case I had to add some widget to make the PopUpPanel appear. Try using a label to make sure the Popup is showing.
PopupPanel popup = new PopupPanel();
popup.setVisible(true);
popup.center();
popup.show();
popup.setWidth("500px");
popup.setHeight("500px");
popup.add(new Label("Test"));

Related

GXT3 - Editable Grid: display the row to edit in a popup

GXT3 - Grid: Adding a column with a button to modify row in Editable Grid
In the example the line is editable automatically when line is selected.
http://www.sencha.com/examples/#Exam...oweditablegrid
I want the line to be changed when I click on the edit button that would appear in a popup.
TextButtonCell button = new TextButtonCell();
button.addSelectHandler(new SelectHandler() {
#Override
public void onSelect(SelectEvent event) {
Context c = event.getContext();
Info.display("Event", "Call the popup here.");
}
});
nameColumn.setCell(button);
There is a way do get this?
Thanks in advance for your help.
First of all you have yo create a column with TextBoxCell which may you already created.
Then you have to disable default onclick editable behavior of grid.
For that as per Sencha example's file RowEditingGridExample.java you can override onClick event and prevent to fire default code.
public class RowEditingGridExample extends AbstractGridEditingExample {
#Override
protected GridEditing<Plant> createGridEditing(Grid<Plant> editableGrid) {
return new GridRowEditing<Plant>(editableGrid){
#Override
protected void onClick(ClickEvent event) {
}
};
}
}
And when you click on textBoxCell click handler you can start editing manually.
TextButtonCell button = new TextButtonCell();
button.addSelectHandler(new SelectHandler() {
#Override
public void onSelect(SelectEvent event) {
Context c = event.getContext();
//Here you can pass a new GridCell like with proper cell index and row index.
GridCell cell = new GridCell(getRowIndex(), getCellIndex());
editing.startEditng(cell);
}
});
nameColumn.setCell(button);
If you want to appear row editor in separate popup you have to design it manually.

How to programmatically open a gwt listbox?

I have a user form with a lot of gwt listbox. The form is like an excel form with named list.
It's ugly and the arrows take place.
I would like the cells were like in excel. The arrow appears only when you click in the cell.
I start to program my own widget with a textbox and a listbox embedded into a DeckPanel, switching when you click on the textbox or when the value change. But with this solution, it is necessary to click again to open the listbox.
Now, it will be great, if when you click on the textbox, the listbox will be displayed already open.
In the code below, I try to do this into the method onClick wih this line:
DomEvent.fireNativeEvent(event.getNativeEvent(), listBox);
But it has no effects.
public class CustomListBox extends Composite implements ClickHandler,
ChangeHandler, HasChangeHandlers {
private final StringListBox listBox;
private final TextBox textBox;
private final DeckPanel panel;
public CustomListBox() {
textBox = new TextBox();
textBox.addClickHandler(this);
textBox.setReadOnly(true);
listBox = new StringListBox();
listBox.addChangeHandler(this);
panel = new DeckPanel();
panel.add(textBox);
panel.add(listBox);
panel.showWidget(0);
// All composites must call initWidget() in their constructors.
initWidget(panel);
}
#Override
public void onClick(ClickEvent event) {
Object sender = event.getSource();
if (sender == textBox) {
panel.showWidget(1);
DomEvent.fireNativeEvent(event.getNativeEvent(), listBox);
}
}
public void addItem(String item) {
listBox.addItem(item);
}
public int getSelectedIndex() {
return listBox.getSelectedIndex();
}
public String getItemText(int selectedIndex) {
return listBox.getItemText(selectedIndex);
}
#Override
public HandlerRegistration addChangeHandler(ChangeHandler handler) {
return listBox.addChangeHandler(handler);
}
#Override
public void onChange(ChangeEvent event) {
Object sender = event.getSource();
if (sender == listBox) {
textBox.setText(getItemText(getSelectedIndex()));
panel.showWidget(0);
}
}
}
Since you are already programming your own widget, why don't you go all the way. Don't swap out the text box for a list box widget. Instead of a textbox use a label. Add an arrow to your label background when you mouse over, then use a popupPanel for the list itself. In the popupPanel you can make the list items whatever you like, just make sure when you click on it, it sets the text in your original label.

GWT Tab panel close

I am building an application in GWT. I have a decorated tabpanel in
my application.Where in am adding panels to it dynamically.Now i want
to achieve the closing of these tabs. I want to add a close image to
the tab bar and event to that image for closing. I am using UIbinder.
the working code is like that;
private Widget getTabTitle(final Widget widget, final String title) {
final HorizontalPanel hPanel = new HorizontalPanel();
final Label label = new Label(title);
DOM.setStyleAttribute(label.getElement(), "whiteSpace", "nowrap");
ImageAnchor closeBtn = new ImageAnchor();
closeBtn.setResource(images.cross());
closeBtn.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
int widgetIndex = tabs.getWidgetIndex(widget);
if (widgetIndex == tabs.getSelectedIndex()) {
tabs.selectTab(widgetIndex - 1);
}
tabs.remove(widgetIndex);
}
});
hPanel.add(label);
hPanel.add(new HTML("&nbsp&nbsp&nbsp"));
hPanel.add(closeBtn);
hPanel.setStyleName("gwt-TabLayoutPanelTab");
return hPanel;
}
In order to add tab,
public void addTab() {
TabWriting tw = new TabWriting(); /* TabWriting in my case, this can be any widget */
tabs.add(tw, getTabTitle(tw, "Writing"));
tabs.selectTab(tw);
}
You'll going to need, ImageAnchorClass
public class ImageAnchor extends Anchor {
public ImageAnchor() {
}
public void setResource(ImageResource imageResource) {
Image img = new Image(imageResource);
img.setStyleName("navbarimg");
DOM.insertBefore(getElement(), img.getElement(), DOM
.getFirstChild(getElement()));
}}
It isn't supported natively in GWT.
You can manually try to add it.
Read this - http://groups.google.com/group/google-web-toolkit/browse_thread/thread/006bc886c1ccf5e1?pli=1
I haven't tried it personally, but look at the solution by gregor (last one).
You kinda need to do something along the lines of this
GWT Close button in title bar of DialogBox
First you need to pass in the tab header when you create the new tab. The header you pass in should have your tab text and also an X image or text label to click on. Then add a event handler on the close object that gets the widget you are adding to the tabPanel and removes it. Here is some inline code that works
public void loadTab(final Widget widget, String headingText, String tooltip) {
HorizontalPanel panel = new HorizontalPanel();
panel.setStyleName("tabHeader");
panel.setTitle(tooltip);
Label text = new Label();
text.setText(headingText);
text.setStyleDependentName("text", true);
Label close = new Label();
close.setText("X");
close.setTitle(closeText_ + headingText);
text.setStyleDependentName("close", true);
close.addClickHandler(new ClickHandler() {
#Override
public void onClick(ClickEvent event) {
Window.alert("close this tab");
ClientGlobal.LOG.info("widget : " + tabPanel_.getWidgetIndex(widget));
tabPanel_.remove(tabPanel_.getWidgetIndex(widget));
}
});
panel.add(text);
panel.add(close);
panel.setCellHorizontalAlignment(text, HasHorizontalAlignment.ALIGN_LEFT);
panel.setCellHorizontalAlignment(close, HasHorizontalAlignment.ALIGN_RIGHT);
tabPanel_.add(widget, panel);
tabPanel_.getTabWidget(widget).setTitle(tooltip);
tabPanel_.selectTab(widget);
}

DialogBox in GWT isn't draggable or centred

I'm new to GWT programming. So far I have a DialogBox which is supposed to collect a login and a password, which can if required launch another DialogBox that allows someone to create a new account.
The first of these two DialogBoxes always appears at the top left of the browser screen, and can't be dragged, although part of the definition of a DialogBox is that it can be dragged. However, the second DialogBox can be dragged about the screen without any problem.
What I'd really like is for the first DialogBox to appear in the middle of the screen & be draggable, both of which I thought would happen automatically, but there's not.
So, what things can stop a DialogBox from being draggable? There is nothing on the RootPanel yet. Does that make a difference?
Code fragments available if they help, but perhaps this general outline is enough for some pointers.
Thanks
Neil
Use dialogBox.center() This will center your DialogBox in the middle of the screen. Normally a DialogBox is by default draggable.
Just tried it out and it doens't matter if your RootPanel is empty our not. When I just show the DialogBox on ModuleLoad it is draggable and it is centered. Probably the problem is situated somewhere else.
This is the example of google itself:
public class DialogBoxExample implements EntryPoint, ClickListener {
private static class MyDialog extends DialogBox {
public MyDialog() {
// Set the dialog box's caption.
setText("My First Dialog");
// DialogBox is a SimplePanel, so you have to set its widget property to
// whatever you want its contents to be.
Button ok = new Button("OK");
ok.addClickListener(new ClickListener() {
public void onClick(Widget sender) {
MyDialog.this.hide();
}
});
setWidget(ok);
}
}
public void onModuleLoad() {
Button b = new Button("Click me");
b.addClickListener(this);
RootPanel.get().add(b);
}
public void onClick(Widget sender) {
// Instantiate the dialog box and show it.
new MyDialog().show();
}
}
Here more information about the DialogBox.
Without seeing any of your code it's hard to tell what's going wrong. The following code works for me (ignore the missing styling...):
public void onModuleLoad() {
FlowPanel login = new FlowPanel();
Button create = new Button("create");
login.add(new TextBox());
login.add(new TextBox());
login.add(create);
create.addClickHandler(new ClickHandler() {
#Override
public void onClick(ClickEvent event) {
final DialogBox box = new DialogBox();
FlowPanel panel = new FlowPanel();
Button close = new Button("close");
close.addClickHandler(new ClickHandler() {
#Override
public void onClick(ClickEvent event) {
box.hide();
}
});
panel.add(new Label("some content"));
panel.add(close);
box.setWidget(panel);
box.center();
}
});
DialogBox firstBox = new DialogBox(false, true);
firstBox.setWidget(login);
firstBox.center();
}
Both boxes are draggable and shown in the center of your browser window.
Looks like you're overriding this method in Widget:
public void fireEvent(GwtEvent<?> event) {
if (handlerManager != null) {
handlerManager.fireEvent(event);
}
}
In Widget, handlerManager refers to a private HandlerManager.
Either add super.fireEvent(event) to your method or as you have done rename it.
Well, with vast amounts of trial and error I have found the problem, which was just this: I had a method in an object I'd based on DialogBox called fireEvent, which looked like this:
public void fireEvent(GwtEvent<?> event)
{
handlerManager.fireEvent(event);
}
Then, when a button was clicked on the DialogBox, an event would be created and sent off to the handlerManager to be fired properly.
And it turns out that if I change it to this (LoginEvent is a custom-built event):
public void fireEvent(LoginEvent event)
{
handlerManager.fireEvent(event);
}
... or to this ....
public void fireAnEvent(GwtEvent<?> event)
{
handlerManager.fireEvent(event);
}
the DialogBox is draggable. However, if the method begins with the line
public void fireEvent(GwtEvent<?> event)
then the result is a DialogBox which can't be dragged.
I'm a bit unsettled by this, because I can't fathom a reason why my choice of name of a method should affect the draggability of a DialogBox, or why using a base class (GwtEvent) instead of a custom class that extends it should affect the draggability. And I suspect there are dozens of similar pitfalls for a naive novice like me.
(Expecting the DialogBox to centre itself was simply my mistake.)

GWT focus on a TextBox it not working

I am trying to focus on a particular list view in a tree, I am using the following code
this.txtListName.setCursorPos(this.txtListName.getText().length());
this.txtListName.setFocus(true);
The text view has the cursor blinking inside it but when I type a key nothing happens, I have to select the text view again before being able to type.
Why is this happening.
SOLVED
The setting the the focus was done inside a for loop that looped over and created the Tree Items, when I removed it from the for loop it worked.
Could it be that something in your current call stack is taking the focus away after you set it. You could try setting the focus in a timeout:
(new Timer() {
#Override
public void run() {
txtListName.setFocus(true);
}
}).schedule(0);
I've tried to recreate your problem but the following snippet works for me:
public void onModuleLoad() {
Tree tree = new Tree();
final TextBox box = new TextBox();
box.setText("some content");
tree.add(box);
Button btn = new Button("set focus");
btn.addClickHandler(new ClickHandler() {
#Override
public void onClick(ClickEvent event) {
box.setCursorPos(box.getText().length());
box.setFocus(true);
}
});
RootPanel.get().add(tree);
RootPanel.get().add(btn);
}
Isn't that what you're trying to achieve?