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42 SWT Widgets
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171 Group
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Group widgets are a special type of composite widget that surround children with an etched border and an optional label Each child widget is contained within the bounds of the group and resizes itself relative to it Useful APIs include:
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getChildren() Returns an array containing the receiver s children layout() If the receiver has a layout, it asks the layout to set the size
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and location of the receiver s children
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setLayout(Layout) Sets the layout that is associated with the receiver to be the argument, which may be null setTabList(Control[]) Sets the tabbing order for the specified controls to match the order in which they occur in the argument list setText(String) Sets the receiver s text, which is the string that
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will be displayed as the receiver s title, to the argument, which may not be null Useful creation styles include:
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SWTBORDER Creates a composite widget with a border SWTNO_RADIO_GROUP Prevents child radio button behavior
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The example code that follows replaces the composite in the previous example with a group widget (see Figure 4 12)
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Figure 4 12
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Group example
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import orgeclipseswt*; import orgeclipseswtevents*; import orgeclipseswtwidgets*;
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The Standard Widget Toolkit
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public class GroupExample { public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shellsetText("Group Example"); shellsetBounds(100, 100, 200, 200); Group group = new Group(shell, SWTNULL); groupsetText("My Group"); groupsetBounds(25, 25, 150, 125); final Button button = new Button(group, SWTPUSH); buttonsetBounds(25, 25, 100, 75); buttonsetText("Click Me Now"); buttonaddSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent event) { buttonsetText("I Was Clicked"); } }); shellopen(); while (!shellisDisposed()) { if (!displayreadAndDispatch()) displaysleep(); } displaydispose(); } }
A group widget is created as a child of the shell and acts as the parent of the button widget In addition to the border, which is always present, the group widget also has a label
42610 Tab folder
The tab folder widget is used to organize information within a window frame into multiple pages that appear as a set of notebook tabs Clicking on a tab brings that page to the front Tabs can be labels with images and text Useful APIs include:
addSelectionListener(SelectionListener) Adds the listener to the collection of listeners that will be notified when the receiver s selection changes by sending it one of the messages defined in the SelectionListener interface TabItem getItem(int) Returns the item at the given, zero-relative
index in the receiver
getItemCount() Returns the number of items contained in the
receiver
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receiver
getSelection() Returns an array of TabItems that are currently selected in the receiver getSelectionIndex() Returns the zero-relative index of the item that is currently selected in the receiver, or -1 if no item is selected indexOf(TabItem item) Searches the receiver s list starting at the first item (index 0) until an item is found that is equal to the argument, and returns the index of that item setSelection(int) Selects the item at the given zero-relative index in
the receiver Useful tab folder APIs include:
getControl() Returns the control that is used to fill the client area
of the tab folder when the user selects the tab item
setControl(Control control) Sets the control that is used to fill the client area of the tab folder when the user selects a tab item setImage(Image) Sets the receiver s image to the argument, which may be null, indicating that no image should be displayed setText(String) Sets the receiver s text setToolTipText(String) Sets the receiver s tool tip text to the argument, which may be null, indicating that no tool tip text should be shown
The example code that follows creates a tab folder with several tabs Each tab contains a composite containing a single button (see Figure 4 13)
Figure 4 13
Tab folder example
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CHAPTER 4
The Standard Widget Toolkit
public class TabFolderExample { public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shellsetText("TabFolder Example"); shellsetBounds(100, 100, 175, 125); shellsetLayout(new FillLayout()); final TabFolder tabFolder = new TabFolder(shell, SWTBORDER); for (int i = 1; i < 4; i++) { TabItem tabItem = new TabItem(tabFolder, SWTNULL); tabItemsetText("Tab " + i); Composite composite = new Composite(tabFolder, SWTNULL); tabItemsetControl(composite); Button button = new Button(composite, SWTPUSH); buttonsetBounds(25, 25, 100, 25); buttonsetText("Click Me Now"); buttonaddSelectionListener( new SelectionAdapter(){ public void widgetSelected( SelectionEvent event) { ((Button)eventwidget) setText("I Was Clicked"); } }); } shellopen(); while (!shellisDisposed()) { if (!displayreadAndDispatch()) displaysleep(); } displaydispose(); } }
After the tab folder is created, several tab items are added For each tab item, the setControl() method is used to fill its client area with a composite widget A button widget is then added to each composite