Develop Reference

swt menu on click hide display composites

I am building a SWT application and have a menu created. Menu has multiple menu items like Add, Edit, Help. On click of each Menu Item, I want to show a composite which will display the details of it. I am able to build it, problem I am facing is, the space of hidden composite is not taken by visible composite. How can we make the composite occupy the entire space.
Also I am adding the selection listener to make the current composite visible and other composite hidden. In the current app there will multiple menu items and each one will have composite associated it. Listener needs reference of all composites to make them visible/hidden. Is there any better approach to do this.
public class MenuToggle {
boolean startup = true;
Menu menu, fileMenu, helpMenu;
Composite composite1,composite2;
public MenuToggle(Shell shell) {
createMenu(shell);
createFileView(shell);
createHelpView(shell);
startup = false;
}
public void createMenu(Shell shell) {
//Menu Bar
menu = new Menu(shell, SWT.BAR);
//File Menu
fileMenu = new Menu(shell, SWT.DROP_DOWN);
MenuItem fileMenuHeader = new MenuItem(menu, SWT.CASCADE);
fileMenuHeader.setText("&File");
fileMenuHeader.setMenu(fileMenu);
MenuItem fileSaveItem = new MenuItem(fileMenu, SWT.PUSH);
fileSaveItem.setText("&Save");
MenuItem fileExitItem = new MenuItem(fileMenu, SWT.PUSH);
fileExitItem.setText("E&xit");
//Help Menu
helpMenu = new Menu(shell, SWT.DROP_DOWN);
MenuItem helpMenuHeader = new MenuItem(menu, SWT.CASCADE);
helpMenuHeader.setText("&Help");
helpMenuHeader.setMenu(helpMenu);
MenuItem helpGetHelpItem = new MenuItem(helpMenu, SWT.PUSH);
helpGetHelpItem.setText("&Get Help");
shell.setMenuBar(menu);
fileSaveItem.addSelectionListener(new SelectionAdapter() {
#Override
public void widgetSelected(SelectionEvent e) {
composite1.setVisible(true);
((GridData)composite1.getLayoutData()).exclude = false;
composite2.setVisible(false);
((GridData)composite2.getLayoutData()).exclude = true;
composite2.layout(true, true);
}
});
helpGetHelpItem.addSelectionListener(new SelectionAdapter() {
#Override
public void widgetSelected(SelectionEvent e) {
composite1.setVisible(false);
((GridData)composite1.getLayoutData()).exclude = true;
composite2.setVisible(true);
((GridData)composite2.getLayoutData()).exclude = false;
composite2.layout(true, true);
}
});
}
public void createFileView(Shell shell) {
composite1 = new Composite(shell, SWT.BORDER);
composite1.setVisible(true);
GridData gd1 = new GridData(SWT.FILL, SWT.FILL, true, true);
composite1.setLayoutData(gd1);
composite1.setLayout(new GridLayout(1,true));
Label label = new Label(composite1, SWT.CENTER);
label.setBounds(composite1.getClientArea());
label.setText("Saved");
}
public void createHelpView(Shell shell) {
composite2 = new Composite(shell, SWT.BORDER);
composite2.setVisible(false);
GridData gd2 = new GridData(SWT.FILL, SWT.FILL, true, true);
composite2.setLayoutData(gd2);
composite2.setLayout(new GridLayout(1,true));
Label label1 = new Label(composite2, SWT.CENTER);
label1.setBounds(composite2.getClientArea());
label1.setText("No worries!");
}
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
shell.setText("Menu Display");
MenuToggle instance = new MenuToggle(shell);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}

There are a number of issues here.
You are using FillLayout for the Shell layout, so the GridData you are setting on the composites is ignored. You must use GridLayout for the Shell:
public static void main(final String[] args) {
final Display display = new Display();
final Shell shell = new Shell(display);
shell.setLayout(new GridLayout()); // Changed
When you change the exclude settings you must call layout on the parent of the composite - the shell:
fileSaveItem.addSelectionListener(new SelectionAdapter() {
#Override
public void widgetSelected(final SelectionEvent e) {
composite1.setVisible(true);
((GridData)composite1.getLayoutData()).exclude = false;
composite2.setVisible(false);
((GridData)composite2.getLayoutData()).exclude = true;
shell.layout(true, true); // change
}
});
helpGetHelpItem.addSelectionListener(new SelectionAdapter() {
#Override
public void widgetSelected(final SelectionEvent e) {
composite1.setVisible(false);
((GridData)composite1.getLayoutData()).exclude = true;
composite2.setVisible(true);
((GridData)composite2.getLayoutData()).exclude = false;
shell.layout(true, true); // change
}
});
You are calling setBounds on the Label controls, this does not work when you are using layouts because the layout also calls setBounds and overrides your settings, use setLayoutData instead
Label label = new Label(composite1, SWT.CENTER);
label.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); // replace
//label.setBounds(composite1.getClientArea()); // wrong
As for dealing with lots of Composite controls you could call shell.getChildren and loop through the child controls. Or add the composites to a List and loop through that.

Show/Hide Application from/to System Tray

I need some guidance in how to get the application to show up from the System Tray when I click on it.
I have managed to minimize the app on closure but I can't make it to show up.
If I'm builduing a new shell with same Contents would help?(I am building a SWT application)
This is how I am initializing my Shell: (I have modified it so I don't use AWT with SWT)
protected Shell shlSmartHouseSystem;
public void open() {
Display display = Display.getDefault();
createContents();
shlSmartHouseSystem.open();
shlSmartHouseSystem.layout();
while (!shlSmartHouseSystem.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
}
And this is my function where I am minimizing in Tray:
public void minimizeToTrayOnClose() {
final Display display = shlSmartHouseSystem.getDisplay();
Image image = new Image(display,"D:\\VIA_University_(Embedded_Systems)\\AJP_Workspace\\HouseSystem_Server\\icon-smart-house.png");
Tray tray = display.getSystemTray();
if (tray != null) {
TrayItem trayItm = new TrayItem(tray,SWT.NONE);
trayItm.setImage(image);
final Menu menu = new Menu(shlSmartHouseSystem, SWT.POP_UP);
MenuItem menuItem = new MenuItem(menu, SWT.PUSH);
menuItem.setText("Show");
menuItem.addListener (SWT.Selection, new Listener () {
public void handleEvent (Event e) {
System.out.println("Opened");
}
});
menuItem = new MenuItem(menu, SWT.PUSH);
menuItem.setText("Exit");
menuItem.addListener (SWT.Selection, new Listener () {
public void handleEvent (Event e) {
System.exit(0);
}
});
trayItm.addListener (SWT.MenuDetect, new Listener () {
public void handleEvent (Event event) {
menu.setVisible (true);
}
});
}
}

scroll and auto resize

I try to make scroll working and I also want to auto resize window and content that is in the window. My interface is going to have couple of composite blocks that are going to parse some information, and fields inside block are static and they going to be always same fields in same block `
public void open() {
Display display = Display.getDefault();
createContents();
shell.addListener (SWT.Resize, new Listener () {
public void handleEvent (Event e) {
Rectangle rect = shell.getClientArea ();
System.out.println(rect);
}
});
shell.open();
shell.layout();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
}
/**
* Create contents of the window.
*/
protected void createContents() {
shell = new Shell(SWT.SHELL_TRIM |SWT.V_SCROLL | SWT.H_SCROLL);
shell.addMouseWheelListener(new MouseWheelListener() {
public void mouseScrolled(MouseEvent e) {
}
});
shell.setSize(1546, 878);
shell.setBackground(SWTResourceManager.getColor(255, 255, 255));
shell.setMaximized(true);
shell.setMinimumSize(1500, 600);
shell.setText("Test App for nothing");
shell.setLayout(new FillLayout(SWT.HORIZONTAL));

SWT Adding KeyListener to a Display

I want to add a KeyListener to my existing window. I want to catch 3 KeyDown's. On the first KeyDown I want to put something in a Combo. On the second KeyDown I want to put something in another Combo. If both textbox are filled, I want the next KeyDown to simulate the OK Button.
But I have a problem with the error widget disposed. Because I dont know when to remove the filter correct. This only happend if I open the window again!
My Code:
_disp.addFilter(SWT.KeyDown, new Listener() {
public void handleEvent(Event e) {
if(!_disp.isDisposed()){
_disp.removeFilter(SWT.KeyDown, this);
}
if (e.keyCode == SWT.CR) {
if (_cmbCCID.getText().isEmpty()) {
_cmbCCID.setText(_lastFiveCCID[0]);
} else if (_cmbDescription.getText().isEmpty()) {
_cmbDescription.setText(_lastFiveComment[0]);
} else if (!_cmbCCID.getText().isEmpty() && !_cmbDescription.getText().isEmpty()) {
_btnOk.notifyListeners(SWT.Selection, new Event());
}
}
}
});

You're removing the filter after the first key press. Try something like this:
public static void main(String[] args)
{
final Display display = new Display();
Shell shell = new Shell(display);
shell.setText("StackOverflow");
shell.setLayout(new FillLayout());
new Text(shell, SWT.NONE);
display.addFilter(SWT.KeyDown, new Listener()
{
int i = 0;
#Override
public void handleEvent(Event arg0)
{
if (i < 2)
System.out.println("Press " + i);
else
{
System.out.println("Press " + i);
System.out.println("Remove");
if (!display.isDisposed())
display.removeFilter(SWT.KeyDown, this);
}
i++;
}
});
shell.pack();
shell.open();
while (!shell.isDisposed())
{
while (!display.readAndDispatch())
{
display.sleep();
}
}
}
It will remove the filter after the third key press event.

SWT: Differentiating between selection and typing in a combo

Consider the following Java (SWT) code:
private static ComboViewer createViewer(final Shell shell) {
final ComboViewer v = new ComboViewer(shell, SWT.DROP_DOWN);
v.setLabelProvider(new LabelProvider());
v.setContentProvider(new ArrayContentProvider());
v.setInput(new String[]{"value 1", "value 2"});
return v;
}
public static void main(final String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setSize(200, 60);
shell.setLayout(new GridLayout());
final ComboViewer v = createViewer(shell);
// This wires up the userSelectedSomething method correctly
v.addSelectionChangedListener(new ISelectionChangedListener() {
#Override
public void selectionChanged(final SelectionChangedEvent event) {
userSelectedSomething();
}
});
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
public static void userSelectedSomething() {
// This should be called *only if* the user selected from the drop-down
}
public static void userTypedSomething() {
// This should be called *only if* the user typed in the combo
}
I want to call the userTypedSomething method only if the user typed into the combo (and not when they selected from the drop-down). What listener should I add to achieve this? Adding a modify listener to the combo viewer with v.getCombo().addModifyListener(...) is no good as this is triggered for both typing and selection from the combo.

private static ComboViewer createViewer(final Shell shell) {
final ComboViewer v = new ComboViewer(shell, SWT.DROP_DOWN);
v.setLabelProvider(new LabelProvider());
v.setContentProvider(new ArrayContentProvider());
v.setInput(new String[]{"value 1", "value 2"});
return v;
}
private static boolean userTyped;
private static int index = -1;
public static void main(final String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setSize(200, 60);
shell.setLayout(new GridLayout());
final ComboViewer v = createViewer(shell);
/*
* invoked multiple times when combo selection happens
* invoked once when user types
*/
v.getCombo().addVerifyListener(new VerifyListener() {
#Override
public void verifyText(VerifyEvent e) {
userTyped = (e.keyCode != 0);
}
});
v.getCombo().addModifyListener(new ModifyListener() {
#Override
public void modifyText(ModifyEvent e) {
Combo c = (Combo)e.widget;
if(userTyped || index == c.getSelectionIndex() || c.getSelectionIndex() == -1)
{
userTypedOrEditedSomething();
}
index = c.getSelectionIndex();
}
});
// This wires up the userSelectedSomething method correctly
v.addSelectionChangedListener(new ISelectionChangedListener() {
#Override
public void selectionChanged(final SelectionChangedEvent event) {
userSelectedSomething();
}
});
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
public static void userSelectedSomething() {
// This should be called *only if* the user selected from the drop-down
System.out.println("User selected");
}
public static void userTypedOrEditedSomething() {
// This should be called *only if* the user typed in the combo
System.out.println("User typed or edited");
}
I would suggest you to use Verify event instead Key UP as you might endup handling lot of things (arrow keys, magic keys...etc). Verify is also Key Event but it filter out ALT,CNTRL,SHIFT combination. When user types just check for keycode!=0.
As you pointed out, when you use CNTRL+V ,Right click Menu paste....combo doesn't consider it as key event but it fires verify event to make sure the clipboard text is valid for combo or not. I think this is how it should work as Menu item selection and Key event on combo are different things.
you can always monitor all key events for special actions like copy/paste/delete.
the above sample code should be able to perform what you are looking for.

Since you want to listen to keyboard input, I would suggest listening to SWT.KeyUp.
This should be a good starting point:
public static void main(String[] args) {
final Display display = new Display();
final Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
final Combo combo = new Combo(shell, SWT.NONE);
combo.add("First");
combo.add("Second");
combo.addListener(SWT.Selection, new Listener() {
#Override
public void handleEvent(Event arg0) {
System.out.println("Selected: " + combo.getItem(combo.getSelectionIndex()));
}
});
combo.addListener(SWT.KeyUp, new Listener() {
#Override
public void handleEvent(Event arg0) {
System.out.println("Typed");
}
});
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}