Develop Reference

Hide ON_TOP shell in SWT on Display minimimized

I'm trying to hide a SWT shell when the Display is minimized. I'm missing something and would be most thankful for any help.
Additional Info: This shell is actually a popup that gets drawn when the user clicks on a composite. In the end, my goal is to hide this popup-shell when the composite is not visible (user minimized the window or switched between windows, say with Alt+Tab for example).
Here's my code:
static Shell middleClickNodeInfoShell ;
static Label nodeIdLabel ;
void init(){
...
/** Focused node on middle click*/
middleClickNodeInfoShell = new Shell(Display.getDefault(), SWT.BORDER | SWT.MODELESS);
middleClickNodeInfoShell.setLayoutData(new GridData(GridData.FILL, GridData.BEGINNING, true, false));
middleClickNodeInfoShell.setLayout(createNoMarginLayout(1, false));
nodeIdLabel = new Label(middleClickNodeInfoShell, SWT.NONE);
Display.getDefault().addListener(SWT.Iconify,new Listener() {
#Override
public void handleEvent(Event arg0) {
// TODO Auto-generated method stub
middleClickNodeInfoShell.setVisible(false);
}
});
}
#Override
public boolean onMouseClicked(Button button, ScreenPosition screenPos,
final GeoPosition arg2) {
...
nodeIdLabel.setText("Node Id: "+node.getId());
middleClickNodeInfoShell.setLocation(pos.getX()+displayX,pos.getY()+displayY+30);
middleClickNodeInfoShell.setVisible(true);
middleClickNodeInfoShell.pack();
}

Here is sample code that will help you do figure out what you are looking for
public static void main(String[] args) {
final Display display = new Display();
final Shell shell = new Shell(display);
shell.setSize(300, 200);
shell.setText("Shell Example");
shell.setLayout(new RowLayout());
final Button button = new Button(shell, SWT.PUSH);
button.setText("Click Me");
final Shell tip = new Shell(shell,SWT.MODELESS);
tip.setLayout(new FillLayout());
Label lbl = new Label(tip, SWT.NONE);
lbl.setText("***tooltip***");
tip.pack();
shell.addControlListener(new ControlListener() {
#Override
public void controlResized(ControlEvent e) {
changeTipLocation(display, button, tip);
}
#Override
public void controlMoved(ControlEvent e) {
changeTipLocation(display, button, tip);
}
});
button.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
changeTipLocation(display, button, tip);
tip.open();
}
});
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
private static void changeTipLocation(final Display display, final Button button, final Shell tip) {
Rectangle bounds = button.getBounds();
Point loc = button.getLocation();
tip.setLocation(display.map(button, null, new Point(loc.x+bounds.width, loc.y+bounds.height)));
}

How to change the foreground color of specific items in a List?

When I press a button, I want to change the foreground color of the selected item in a List.
So far, I tried this:
list.setForeground(display.getSystemColor(SWT.COLOR_RED));
but it changes the foreground color of all the items, not just the selected one.
Any ideas how to solve this?

Doing this with a List would require custom drawing. You are better off using a Table instead (or even a TableViewer depending on your requirements). Here is an example of a table that does what you want:
public static void main(String[] args)
{
final Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout(1, false));
shell.setText("StackOverflow");
final Table table = new Table(shell, SWT.BORDER | SWT.MULTI);
table.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
for (int i = 0; i < 10; i++)
{
TableItem item = new TableItem(table, SWT.NONE);
item.setText("item " + i);
}
Button button = new Button(shell, SWT.PUSH);
button.setText("Color selected");
button.addListener(SWT.Selection, new Listener()
{
#Override
public void handleEvent(Event arg0)
{
List<TableItem> allItems = new ArrayList<>(Arrays.asList(table.getItems()));
TableItem[] selItems = table.getSelection();
for (TableItem item : selItems)
{
item.setForeground(display.getSystemColor(SWT.COLOR_RED));
allItems.remove(item);
}
for (TableItem item : allItems)
{
item.setForeground(display.getSystemColor(SWT.COLOR_LIST_FOREGROUND));
}
}
});
shell.pack();
shell.open();
while (!shell.isDisposed())
{
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
Before button press:
After button press:
Just a note: This is not the most efficient way to do it, but should give you the basic idea.

List does not supports what you want.
Use Table and Table items instead.
Each table item represent a row, and it has setForeground(Color) method.

SWT Button Dropdown Control

Is there a standard SWT control that resembles a button which displays an arrow and opens a dropdown menu when pressed and is not a toolbar-only control?
It would be something like this:
It is similar to a combo box control, except that the "button" area would act more similarly to an actual button - its text would not change based on your selection, it would appear depressed when clicked, and the items would be used for actions or navigational purposes instead of for selection. It's also similar to a control available for toolbars, but I need to use it on a regular composite instead.
This is nearly doable simply by using regular button and popup-menu controls - however, I do not believe I can display the arrow next to the text on the button this way. Anyway, since this kind of control seems fairly common, I assumed there would be a standard way to use these two things as one.

I think, this is what you should do get Drop down menu behavior
Create Menu with style SWT.DROP_DOWN
Create MenuItems on Menu
if you want a button
Create a Button with style SWT.ARROW | SWT.DOWN
add SelectionListener
In SelectionListener, Create a Menu with style SWT.POP_UP and position the menu at the button location.
//code
public static void main(String[] args) {
Display display = new Display();
final Shell shell = new Shell(display);
shell.setSize(300, 200);
shell.setText("Button Example");
shell.setLayout(new RowLayout());
/**
*
* Approach1
*
*/
final Composite btnCntrl = new Composite(shell, SWT.BORDER);
btnCntrl.setBackground(display.getSystemColor(SWT.COLOR_WHITE));
btnCntrl.setBackgroundMode(SWT.INHERIT_FORCE);
GridLayoutFactory.fillDefaults().numColumns(2).equalWidth(false).spacing(0, 1).applyTo(btnCntrl);
CLabel lbl = new CLabel(btnCntrl, SWT.NONE);
lbl.setText("Animals");
Button btn = new Button(btnCntrl, SWT.FLAT|SWT.ARROW|SWT.DOWN);
btn.setLayoutData(new GridData(GridData.FILL_VERTICAL));
btn.addSelectionListener(new SelectionAdapter() {
#Override
public void widgetSelected(SelectionEvent e) {
super.widgetSelected(e);
Menu menu = new Menu(shell, SWT.POP_UP);
MenuItem item1 = new MenuItem(menu, SWT.PUSH);
item1.setText("Hare");
MenuItem item2 = new MenuItem(menu, SWT.PUSH);
item2.setText("Fox");
MenuItem item3 = new MenuItem(menu, SWT.PUSH);
item3.setText("Pony");
Point loc = btnCntrl.getLocation();
Rectangle rect = btnCntrl.getBounds();
Point mLoc = new Point(loc.x-1, loc.y+rect.height);
menu.setLocation(shell.getDisplay().map(btnCntrl.getParent(), null, mLoc));
menu.setVisible(true);
}
});
/***
*
*
* Approach 2
*
*/
final Composite btnCntrl2 = new Composite(shell, SWT.BORDER);
btnCntrl2.setBackground(display.getSystemColor(SWT.COLOR_WHITE));
btnCntrl2.setBackgroundMode(SWT.INHERIT_FORCE);
GridLayoutFactory.fillDefaults().numColumns(2).equalWidth(false).spacing(0, 1).applyTo(btnCntrl2);
CLabel lbl2 = new CLabel(btnCntrl2, SWT.NONE);
lbl2.setText("Animals");
Button btn2 = new Button(btnCntrl2, SWT.FLAT|SWT.ARROW|SWT.DOWN);
btn2.setLayoutData(new GridData(GridData.FILL_VERTICAL));
btn2.addSelectionListener(new SelectionAdapter() {
#Override
public void widgetSelected(SelectionEvent e) {
super.widgetSelected(e);
Shell menu = (Shell) btnCntrl2.getData("subshell");
if(menu != null && !menu.isDisposed()){
menu.dispose();
}
menu = new Shell(shell, SWT.NONE);
menu.setLayout(new FillLayout());
Table table = new Table(menu, SWT.FULL_SELECTION);
table.addListener(SWT.MeasureItem, new Listener() {
#Override
public void handleEvent(Event event) {
event.height = 20; //TODO: determine later
}
});
table.addListener(SWT.PaintItem, new Listener() {
#Override
public void handleEvent(Event event) {
Rectangle bounds = event.getBounds();
event.gc.setBackground(event.display.getSystemColor(SWT.COLOR_BLUE));
event.gc.drawLine(bounds.x, bounds.y+bounds.height-1, bounds.x+bounds.width, bounds.y+bounds.height-1);
}
});
TableItem tableItem= new TableItem(table, SWT.NONE);
tableItem.setText(0, "Hare");
TableItem tableItem2= new TableItem(table, SWT.NONE);
tableItem2.setText(0, "Pony" );
TableItem tableItem3= new TableItem(table, SWT.NONE);
tableItem3.setText(0, "Dog");
Point loc = btnCntrl2.getLocation();
Rectangle rect = btnCntrl2.getBounds();
Point mLoc = new Point(loc.x, loc.y+rect.height);
menu.setLocation(shell.getDisplay().map(btnCntrl2.getParent(), null, mLoc));
menu.pack();
menu.setVisible(true);
btnCntrl2.setData("subshell", menu);
}
});
display.addFilter(SWT.MouseDown, new Listener() {
#Override
public void handleEvent(Event event) {
Shell shell = (Shell) btnCntrl2.getData("subshell");
if(shell != null && !shell.getBounds().contains(event.display.map((Control)event.widget, null, new Point(event.x, event.y)))){
shell.dispose();
btnCntrl2.setData("subshell", null);
}
}
});
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}

This snippet shows how to use the described widget in a SWT toolbar. You can set the button text by using the item.setText() method.

This question is almost 10 years old, but just in case someone is still looking for a solution (like I just did ;) ):
I achieved a pretty close behaviour of your description using only a Button and a Menu using this approach: http://eclipseo.blogspot.com/2012/07/show-context-menu-programmatically.html
Button button = new Button(parent, SWT.PUSH);
button.setText("Animals");
Menu menu = new Menu(button);
MenuItem item = new MenuItem(menu, SWT.PUSH);
item.setText("hare");
menu.addListener(SWT.Show, new Listener() {
#Override
public void handleEvent(Event event) {
menu.setVisible(true);
}
});
button.addSelectionListener(new SelectionAdapter() {
#Override
public void widgetSelected(SelectionEvent e) {
menu.notifyListeners(SWT.Show, null);
}
});
The result is that the menu is shown when you (left) click on the button.
Bonus: to achieve the expand icon at the end, you can add a unicode character for a down triangle in the button text like so:
button.setText("Animals \u2BC6");
HTH,
Ben

Populate table row on tree item click using SWT

Is there anyway to pouplate table row after clicking Tree Item.?I don't want to use SWT/Jface TreeTableViewer. Suppose i have Tree with some tree items like cosmetics, Powder. When i click on cosmetic, related value should be populated in table.

Here is a small example:
public static void main(String[] args)
{
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout(1, true));
final Tree tree = new Tree(shell, SWT.SINGLE);
tree.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
/* initialize columns */
TreeItem cosmetics = new TreeItem(tree, SWT.NONE);
cosmetics.setText(0, "cosmetics");
/* other text */
TreeItem powder= new TreeItem(tree, SWT.NONE);
powder.setText(0, "powder");
/* other text */
/* add selection listener to add children */
tree.addListener(SWT.Selection, new Listener()
{
#Override
public void handleEvent(Event arg0)
{
/* get selection */
TreeItem[] items = tree.getSelection();
if(items.length > 0)
{
String parent = items[0].getText();
System.out.println(parent);
/* add new child */
TreeItem newItem = new TreeItem(items[0], SWT.NONE);
newItem.setText(0, "new Item, parent: " + parent);
/* Expand parent */
items[0].setExpanded(true);
}
}
});
shell.pack();
shell.open();
while (!shell.isDisposed())
{
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
It will add a new child to every TreeItem you click on.

i have got the solution
TreeViewer treeViewer= new TreeViewer(comp);
final TableViewer viewer= new TableViewer(comp1, SWT.BORDER);
treeViewer.addSelectionChangedListener(new ISelectionChangedListener()
{
public void selectionChanged(SelectionChangedEvent event)
{
IStructuredSelection selection = (IStructuredSelection) event.getSelection();
Object obj= selection.getFirstElement();
viewer.setInput(obj);
}
});
}

SWT composite - redraw problem

I have a composite element, that initially has a Label. Now I call dispose on the it (the label) and create another label in the same container (composite elm), but I don't see the new text. It brings me to question how do I enable redraw on the composite, so that the new label (or any other component I might create) will render in place of the old one.
Here is the code I have (separated into a unit test for redraw a composite)
private Label createLabel( Composite parent) {
Label label = new Label(parent, SWT.NONE);
label.setAlignment(SWT.CENTER);
label.setLayoutData( new GridData( SWT.CENTER, SWT.CENTER, true, true) );
return label;
}
private void changeText() {
assert testCell != null : "Please initialize test cell";
testCell.getChildren()[0].dispose();
Label l = createLabel(testCell);
l.setText("New TexT");
testCell.redraw();
}
private void draw() {
Display display = new Display();
shell = new Shell(display);
shell.setLayout(new GridLayout(2,false));
testCell = new Composite(shell,SWT.BORDER);
testCell.setLayout(new GridLayout());
Label l = createLabel(testCell);
l.setText("Old Text");
Composite btnCell = new Composite(shell,SWT.NONE);
btnCell.setLayout(new GridLayout());
Button b = new Button(btnCell, SWT.PUSH);
b.setText("Change");
b.addListener(SWT.MouseDown, new Listener() {
public void handleEvent(Event e) {
changeText();
}
});
As you can see, I am calling redraw on the composite after I add a new element. Also, I have verified that after the call to dispose, testCell.getChildren().length returns 0, as expected, and when I create a new label, I get the same expression to return 1, verifying that the new element is indeed getting added to its parent composite container
Am I missing something here ?

In the changeText() function, the
testCell.redraw();
line should be replaced by
testCell.layout();
Or, if you want to resize it correctly you should use
shell.layout();.

I would say add a selectionListener on the label.
.addSelectionListener(new SelectionAdapter() {
#Override
public void widgetSelected(final SelectionEvent e) {
//Change text by Label.setText();
}
}