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+---
+title: Sub-Windows
+order: 7
+layout: page
+---
+
+[[layout.sub-window]]
+= Sub-Windows
+
+__Sub-windows__ are floating panels within a native browser window. Unlike
+native browser windows, sub-windows are managed by the client-side runtime of
+Vaadin using HTML features. Vaadin allows opening, closing, resizing, maximizing
+and restoring sub-windows, as well as scrolling the window content.
+
+[[figure.layout.sub-window.basic]]
+.A Sub-Window
+image::img/subwindow-basic.png[]
+
+Sub-windows are typically used for __Dialog Windows__ and __Multiple Document
+Interface__ applications. Sub-windows are by default not modal; you can set them
+modal as described in <<layout.sub-window.modal>>.
+
+[[layout.sub-window.openclose]]
+== Opening and Closing Sub-Windows
+
+You can open a new sub-window by creating a new [classname]#Window# object and
+adding it to the UI with [methodname]#addWindow()#, typically in some event
+listener. A sub-window needs a content component, which is typically a layout.
+
+In the following, we display a sub-window immediately when a UI opens:
+
+
+[source, java]
+----
+public static class SubWindowUI extends UI {
+    @Override
+    protected void init(VaadinRequest request) {
+        // Some other UI content
+        setContent(new Label("Here's my UI"));
+        
+        // Create a sub-window and set the content
+        Window subWindow = new Window("Sub-window");
+        VerticalLayout subContent = new VerticalLayout();
+        subContent.setMargin(true);
+        subWindow.setContent(subContent);
+        
+        // Put some components in it
+        subContent.addComponent(new Label("Meatball sub"));
+        subContent.addComponent(new Button("Awlright"));
+        
+        // Center it in the browser window
+        subWindow.center();
+        
+        // Open it in the UI
+        addWindow(subWindow);
+    }
+}
+----
+
+The result was shown in <<figure.layout.sub-window.basic>>. Sub-windows by
+default have undefined size in both dimensions, so they will shrink to fit the
+content.
+
+The user can close a sub-window by clicking the close button in the upper-right
+corner of the window. The button is controlled by the __closable__ property, so
+you can disable it with [methodname]#setClosable(false)#. You can also use keyboard
+shortcuts for closing a sub-window.  You can manage the shortcuts with the [methodname]#addCloseShortcut()#,
+[methodname]#removeCloseShortcut()#, [methodname]#removeAllCloseShortcuts()#,
+[methodname]#hasCloseShortcut()# and [methodname]#getCloseShortcuts()# methods.
+
+You close a sub-window also programmatically by calling the
+[methodname]#close()# for the sub-window, typically in a click listener for an
+[guibutton]#OK# or [guibutton]#Cancel# button. You can also call
+[methodname]#removeWindow()# for the current [classname]#UI#.
+
+ifdef::web[]
+[[layout.sub-window.openclose.example]]
+=== Sub-Window Management
+
+Usually, you would extend the [classname]#Window# class for your specific
+sub-window as follows:
+
+
+[source, java]
+----
+// Define a sub-window by inheritance
+class MySub extends Window {
+    public MySub() {
+        super("Subs on Sale"); // Set window caption
+        center();
+
+        // Some basic content for the window
+        VerticalLayout content = new VerticalLayout();
+        content.addComponent(new Label("Just say it's OK!"));
+        content.setMargin(true);
+        setContent(content);
+        
+        // Disable the close button
+        setClosable(false);
+
+        // Trivial logic for closing the sub-window
+        Button ok = new Button("OK");
+        ok.addClickListener(new ClickListener() {
+            public void buttonClick(ClickEvent event) {
+                close(); // Close the sub-window
+            }
+        });
+        content.addComponent(ok);
+    }
+}
+----
+
+You could open the window as follows:
+
+
+[source, java]
+----
+// Some UI logic to open the sub-window
+final Button open = new Button("Open Sub-Window");
+open.addClickListener(new ClickListener() {
+    public void buttonClick(ClickEvent event) {
+        MySub sub = new MySub();
+        
+        // Add it to the root component
+        UI.getCurrent().addWindow(sub);
+    }
+});
+----
+
+endif::web[]
+
+
+[[layout.sub-window.position]]
+== Window Positioning
+
+When created, a sub-window will have an undefined default size and position. You
+can specify the size of a window with [methodname]#setHeight()# and
+[methodname]#setWidth()# methods. You can set the position of the window with
+[methodname]#setPositionX()# and [methodname]#setPositionY()# methods.
+
+
+[source, java]
+----
+// Create a new sub-window
+mywindow = new Window("My Dialog");
+
+// Set window size.
+mywindow.setHeight("200px");
+mywindow.setWidth("400px");
+
+// Set window position.
+mywindow.setPositionX(200);
+mywindow.setPositionY(50);
+
+UI.getCurrent().addWindow(mywindow);
+----
+
+
+[[layout.sub-window.scrolling]]
+== Scrolling Sub-Window Content
+
+((("scroll bars", id="term.layout.sub-window.scrolling.scrollbars", range="startofrange")))
+
+
+If a sub-window has a fixed or percentual size and its content becomes too big
+to fit in the content area, a scroll bar will appear for the particular
+direction. On the other hand, if the sub-window has undefined size in the
+direction, it will fit the size of the content and never get a scroll bar.
+Scroll bars in sub-windows are handled with regular HTML features, namely
+[literal]#++overflow: auto++# property in CSS.
+((("overflow")))
+
+((("[interfacename]#Scrollable#")))
+As [classname]#Window# extends [classname]#Panel#, windows are also
+[interfacename]#Scrollable#. Note that the interface defines __programmatic
+scrolling__, not scrolling by the user. Please see
+<<dummy/../../../framework/layout/layout-panel#layout.panel,"Panel">>.
+
+(((range="endofrange", startref="term.layout.sub-window.scrolling.scrollbars")))
+
+[[layout.sub-window.modal]]
+== Modal Sub-Windows
+
+A modal window is a sub-window that prevents interaction with the other UI.
+Dialog windows, as illustrated in <<figure.layout.sub-window.modal>>, are
+typical cases of modal windows. The advantage of modal windows is limiting the
+scope of user interaction to a sub-task, so changes in application state are
+more limited. The disadvantage of modal windows is that they can restrict
+workflow too much.
+
+You can make a sub-window modal with [methodname]#setModal(true)#.
+
+[[figure.layout.sub-window.modal]]
+.Modal Sub-Window
+image::img/subwindow-modal.png[]
+
+Depending on the theme, the parent window may be grayed when the modal window is
+open.
+
+
+[WARNING]
+.Security Warning
+====
+Modality of child windows is purely a client-side feature and can be
+circumvented with client-side attack code. You should not trust in the modality
+of child windows in security-critical situations such as login windows.
+
+====
+
+
+
+
+
+