Develop Reference

Modify a Text inside a composite in Java SWT

To choose a file and save the filepath I have the following code:
case FILE :
final Composite fileBaseComposite = new Composite(table, SWT.BORDER);
fileBaseComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
final GridLayout fileBaseCompositeGridLayout = new GridLayout(2, false);
fileBaseCompositeGridLayout.marginHeight = 0;
fileBaseCompositeGridLayout.marginWidth = 0;
fileBaseComposite.setLayout(fileBaseCompositeGridLayout);
final Text selectFiletext = new Text(fileBaseComposite, SWT.SINGLE);
selectFiletext.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
selectFiletext.setText(aCurrentContent);
selectFiletext.addModifyListener(new ModifyListener() {
#Override
public void modifyText(ModifyEvent e)
{
Text text = (Text)tableEditor.getEditor();
tableEditor.getItem().setText(ARGUMENT_VALUE_COLUMN, text.getText());
}
});
final Button selectFileButton = new Button(fileBaseComposite, SWT.NONE);
selectFileButton.setText("Browse");
selectFileButton.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, true));
selectFileButton.addSelectionListener(new SelectionAdapter() {
#Override
public void widgetSelected(SelectionEvent e)
{
FileDialog fileSelectDialog = new FileDialog(fileBaseComposite.getShell(), SWT.OPEN);
fileSelectDialog.setText("Select File");
// String is saved separately because otherwise it opens twice
String filePath = fileSelectDialog.open();
if (filePath != null) {
selectFiletext.setText(filePath);
tableEditor.getItem().setText(ARGUMENT_VALUE_COLUMN, filePath);
}
}
});
return fileBaseComposite;
when I try to modify the text manually, I've got a problem with the following error message:
java.lang.ClassCastException: org.eclipse.swt.widgets.Composite cannot be cast to org.eclipse.swt.widgets.Text
I understand the issue but cant find a solution. Is there a possibility to get the text inside the composite?
I want a text and a button in one table cell. The text should be editable manually and readable to safe it.

selectDirectoryText.addModifyListener(new ModifyListener() {
#Override
public void modifyText(ModifyEvent e)
{
Composite comp = (Composite)tableEditor.getEditor();
Text text = (Text)comp.getChildren()[0];
tableEditor.getItem().setText(ARGUMENT_VALUE_COLUMN, text.getText());
}
});
thats the solution..
I wanted to cast the Composite directly to a Text.

formatting TreeItem Text colour?

I am working on Eclipse plugin. Here i created a separate view and now i want to format the color of tree node.
These are code present in createpartcontrol method.
ScrolledComposite sc = new ScrolledComposite(parent, SWT.V_SCROLL );
Composite composite1 = new Composite(sc, SWT.NONE);
Composite composite_1 = creatingcomposite(composite1);
Tree tree = new Tree(composite_1, SWT.FULL_SELECTION );
TreeItem item = new TreeItem(tree, SWT.NONE);
here i want to set some colour like blue.
item.setText("This is sparta");
Now here i want some different colour like yellow on subsubitem text.
TreeItem subsubItem = new TreeItem(subItem, SWT.NONE);
subsubItem.setText(new String[] { "Function Name: "+ errorPreTest11.description.get(j).function });
For doing this i tried to set SWT.COLOR_BLUE but it's not working.

Use
item.setForeground(tree.getDisplay().getSystemColor(SWT.COLOR_BLUE));
You can also create your own colors but if you do this you must dispose of them when you are done.

I suggest you using the TreeViewer. In this case you would have a functionality to set a LabelProvier on your viewer. Label provider has a subclass called StyledCellLabelProvider, which you can successfully extend to provide styling of your labels like this: (Please also see a TextStyle class for more formating options).
public class MyStyledLabelProvider extends StyledCellLabelProvider {
private Styler defaultStyler;
public MyStyledLabelProvider () {
defaultStyler = new Styler() {
#Override
public void applyStyles(TextStyle textStyle) {
textStyle.strikeout = true;
}
};
}
#Override
public void update(ViewerCell cell) {
Object element = cell.getElement();
StyledString styledString = getStyledString(element);
cell.setText(styledString.toString());
cell.setStyleRanges(styledString.getStyleRanges());
super.update(cell);
}
#SuppressWarnings("unchecked")
private StyledString getStyledString(Object element) {
return new StyledString("Cell string", defaultStyler);
}
}

Background color of widgets in JFace PopupDialog

I want to use the JFace PopupDialog as lightweight dialog for user input. But I have some problems with the background color of text widgets.
As you can see below in 1, a SWT.MULTI text widget has no background and border, a SWT.SINGLE text widget has no background.
I tried to override the background color with:
Text comment = new Text(composite, SWT.MULTI|SWT.BORDER);
comment.setFocus();
comment.setBackground(new Color(Display.getDefault(), new RGB(000, 000, 000)));
// method of PopupDialog
applyBackgroundColor(new Color(Display.getDefault(), new RGB(000, 000, 000)), comment);
Does anybody has any idea how to handle this properly?
Thanks in advance!
EDIT: As requested, here is the source for the popup. I subclassed the PopupDialog, as I wanted the popup to be opened next to the Cursor location:
public class MouseLocationPopupDialog extends PopupDialog {
private final static int SHELL_STYLE = PopupDialog.INFOPOPUP_SHELLSTYLE;
public MouseLocationPopupDialog(Shell parent, String infoText) {
this(parent, SHELL_STYLE, true, false, false, false, false, null, infoText);
}
public MouseLocationPopupDialog(Shell parent, String titleText, String infoText) {
this(parent, SHELL_STYLE, true, false, false, false, false, titleText, infoText);
}
public MouseLocationPopupDialog(Shell parent, String infoText, final Point size) {
this(parent, infoText);
getShell().setSize(size);
}
public MouseLocationPopupDialog(Shell parent, int shellStyle, boolean takeFocusOnOpen, boolean persistSize, boolean persistLocation, boolean showDialogMenu, boolean showPersistActions, String titleText, String infoText) {
super(parent, shellStyle, takeFocusOnOpen, persistSize, persistLocation, showDialogMenu, showPersistActions, titleText, infoText);
}
#Override
protected void adjustBounds() {
super.adjustBounds();
Display d = Display.getCurrent();
if (d == null) {
d = Display.getDefault();
}
Point point = d.getCursorLocation();
getShell().setLocation(point.x + 9, point.y + 14);
}
}
The actual usage is as follows:
final PopupDialog dialog = new MouseLocationPopupDialog(HandlerUtil.getActiveShell(event), "Title", "Bottom bar") {
#Override
protected Control createDialogArea(Composite parent) {
Control composite = super.createDialogArea(parent);
Composite table = new Composite((Composite) composite, SWT.NONE);
table.setLayout(new GridLayout(2, true));
// text is a member variable
text = new Text(table, SWT.SINGLE | SWT.BORDER);
Button submit = new Button(table, SWT.PUSH);
return composite;
}
#Override
protected Control createContents(Composite parent) {
Control contents = super.createContents(parent);
final Color backgroundColor = new Color(Display.getCurrent(), new RGB(255, 255, 255));
text.setBackground(backgroundColor);
final Color foregroundColor = new Color(Display.getCurrent(), new RGB(0,0,0));
text.setForeground(foregroundColor);
backgroundColor.dispose();
foregroundColor.dispose();
return contents;
}
};
dialog.open();
Note that this Popup is independent from other UI elements: The code will not wait for the completion of the popups open() like other JFace dialogs (e.g. TitleAreaDialog)

First of all, use SWT.BORDER instead of SWT.BORDER_SOLID. If you're lucky, this somehow causes your problem. Other than that, from your small snippet alone it's hard to see what goes wrong. Unless there is some other code that resets the background color later on, this should work.
Update:
Try to override the method getBackground() of PopupDialog and let it return the color you want. Your code probably is in createDialogArea(..) and PopupDialog applies this color to basically everything after your code.
If you only want to change the background color of specific controls, you could try the following:
#Override
protected Control createContents(Composite parent) {
Composite contents = super.createContents(parent);
// set the color here
return contents;
}

Eclipse RCP Dialog: Large Text box won't scroll - instead creates a huge dialog window!

I've been banging away at this for a while now and I can't seem to get anywhere. I've tried all of the examples I can find online and nothing seems to work! I haven't been able to find much on this problem which leads me to think I'm missing something basic. . .
In my Eclipse RCP program I want to display a dialog that will show a list of errors that occurred while loading a data file. I have overridden TitleAreaDialog and simply want to display a scrollable Text containing the list of errors and an OK button.
The problem is that the Text vertical scroll bars don't become active - the Text just grows taller to fit the text. This makes the dialog window height increases until it either fits the Text box or until it reaches the height of the screen - and then it just cuts off the bottom of the Text box.
How do I prevent the Dialog/Text box from growing too large? What am I missing?
Thanks for your help!!
-Christine
...
Here is a simple program showing my Dialog:
import org.eclipse.jface.dialogs.IMessageProvider;
import org.eclipse.jface.dialogs.TitleAreaDialog;
import org.eclipse.swt.*;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class ScrollableDialogRunner {
public static void main(String[] args) {
System.out.println("starting");
Display display = new Display ();
Shell shell = new Shell (display);
String errors = "one\ntwo\nthree\nfour\nfive\n";
for(int i = 0; i < 5; i++){
errors += errors;
}
ScrollableDialog dialog = new ScrollableDialog(shell, "Errors occurred during load", "The following errors occurred while loaded file 'x.data'", errors);
dialog.open();
}
}
class ScrollableDialog extends TitleAreaDialog {
private String title;
private String text;
private String scrollableText;
public ScrollableDialog(Shell parentShell, String title, String text, String scrollableText) {
super(parentShell);
this.title = title;
this.text = text;
this.scrollableText = scrollableText;
}
#Override
protected Control createDialogArea(Composite parent) {
GridLayout layout = new GridLayout();
layout.numColumns = 1;
parent.setLayout(layout);
GridData gridData = new GridData();
gridData.grabExcessHorizontalSpace = true;
gridData.horizontalAlignment = GridData.FILL;
Text scrollable = new Text(parent, SWT.BORDER | SWT.V_SCROLL);
scrollable.setLayoutData(gridData);
scrollable.setText(scrollableText);
return parent;
}
#Override
public void create() {
super.create();
setTitle(title);
setMessage(text, IMessageProvider.ERROR);
}
#Override
protected void createButtonsForButtonBar(Composite parent) {
Button okButton = createButton(parent, OK, "OK", true);
okButton.addSelectionListener(new SelectionAdapter() {
#Override
public void widgetSelected(SelectionEvent e) {
close();
}
});
}
#Override
protected boolean isResizable() {
return false;
}
}

Assign a size to the dialog; otherwise, the dialog will layout the children asking them for their "preferred" size (which is infinite for the text widget) and will resize itself accordingly.
[EDIT] This version works. See my comments for details.
class ScrollableDialog extends TitleAreaDialog {
private String title;
private String text;
private String scrollableText;
public ScrollableDialog(Shell parentShell, String title, String text, String scrollableText) {
super(parentShell);
this.title = title;
this.text = text;
this.scrollableText = scrollableText;
}
#Override
protected Control createDialogArea(Composite parent) {
Composite composite = (Composite) super.createDialogArea (parent); // Let the dialog create the parent composite
GridData gridData = new GridData();
gridData.grabExcessHorizontalSpace = true;
gridData.horizontalAlignment = GridData.FILL;
gridData.grabExcessVerticalSpace = true; // Layout vertically, too!
gridData.verticalAlignment = GridData.FILL;
Text scrollable = new Text(composite, SWT.BORDER | SWT.V_SCROLL);
scrollable.setLayoutData(gridData);
scrollable.setText(scrollableText);
return composite;
}
#Override
public void create() {
super.create();
// This is not necessary; the dialog will become bigger as the text grows but at the same time,
// the user will be able to see all (or at least more) of the error message at once
//getShell ().setSize (300, 300);
setTitle(title);
setMessage(text, IMessageProvider.ERROR);
}
#Override
protected void createButtonsForButtonBar(Composite parent) {
Button okButton = createButton(parent, OK, "OK", true);
okButton.addSelectionListener(new SelectionAdapter() {
#Override
public void widgetSelected(SelectionEvent e) {
close();
}
});
}
#Override
protected boolean isResizable() {
return true; // Allow the user to change the dialog size!
}
}

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();
}
}