问题
I'm generating a dialog with a lot of content. I want to pack the dialog to the childrens height, and I want to center it on screen, so I'm doing this after adding all the childrens:
shell.open();
shell.layout();
shell.pack(); //for wrap the dialog size to it's content width and height.
//the dialog must be centered after doing shell.pack();
Rectangle parentSize = getParent().getBounds();
Rectangle shellSize = shell.getBounds();
int x = parentSize.x + (parentSize.width - shellSize.width) / 2;
int y = (int) (parentSize.y + (parentSize.height - shellSize.height) / 3.5);
shell.setLocation(new Point(x, y));
The problem is that for some milliseconds the dialog is being visible with a lot of width and on the top left corner of the screen. I tryed doing setVisible(false) and (true) to shell to do the trick but it doesn't works.
How can i avoid to see the dialog on the top left corner and with a lot of width for some milliseconds?
This is the full code:
public class SelectTwoMatrixNumbersDialog extends Dialog {
protected ArrayList<Integer> matrixNumbers1;
protected ArrayList<Integer> matrixNumbers2;
protected Shell shell;
private JointBet jointBet;
private boolean result;
NumbersMatrixWidget numbersMatrixWidget1;
NumbersMatrixWidget numbersMatrixWidget2;
/**
* Create the dialog.
* @param parent
* @param style
*/
public SelectTwoMatrixNumbersDialog(Shell parent, int style, JointBet jointBet) {
super(parent, style);
setText("Elegir Números");
this.jointBet = jointBet;
}
/**
* Open the dialog.
* @return the result
*/
public boolean open() {
createContents();
matrixNumbers1 = new ArrayList<Integer>();
matrixNumbers2 = new ArrayList<Integer>();
GridLayout gl_shell = new GridLayout(1, false);
gl_shell.marginWidth = 20;
gl_shell.marginHeight = 20;
shell.setLayout(gl_shell);
Composite contentComposite = new Composite(shell, SWT.NONE);
contentComposite.setLayout(new GridLayout(1, false));
contentComposite.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, true, true, 1, 1));
Label lblNumbers = new Label(contentComposite, SWT.NONE);
lblNumbers.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, false, false, 1, 1));
lblNumbers.setText("Números:");
Composite numbersContainerComposite = new Composite(contentComposite, SWT.NONE);
numbersContainerComposite.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, false, false, 1, 1));
//variable values depending of type of game
boolean firstCellEmpty = jointBet.getGameType().getNumbersMatrixArray()[0].isFirstCellEmpty();
int matrix1Rows = jointBet.getGameType().getNumbersMatrixArray()[0].getRows();
int matrix1Columns = jointBet.getGameType().getNumbersMatrixArray()[0].getColumns();
int matrix1MinNumber = jointBet.getGameType().getNumbersMatrixArray()[0].getMinNumber();
int matrix1MaxNumber = jointBet.getGameType().getNumbersMatrixArray()[0].getMaxNumber();
GridLayout gl_numbersContainerComposite = new GridLayout(2, false);
gl_numbersContainerComposite.horizontalSpacing = 15;
numbersContainerComposite.setLayout(gl_numbersContainerComposite);
numbersMatrixWidget1 = new NumbersMatrixWidget(numbersContainerComposite, SWT.BORDER, false, jointBet.getGameType().getNumbersMatrixArray()[0].getNumbers(), matrix1Rows, matrix1Columns, matrix1MinNumber, matrix1MaxNumber, firstCellEmpty);
//variable values depending of type of game
firstCellEmpty = jointBet.getGameType().getNumbersMatrixArray()[1].isFirstCellEmpty();
int matrix2Rows = jointBet.getGameType().getNumbersMatrixArray()[1].getRows();
int matrix2Columns = jointBet.getGameType().getNumbersMatrixArray()[1].getColumns();
int matrix2MinNumber = jointBet.getGameType().getNumbersMatrixArray()[1].getMinNumber();
int matrix2MaxNumber = jointBet.getGameType().getNumbersMatrixArray()[1].getMaxNumber();
numbersMatrixWidget2 = new NumbersMatrixWidget(numbersContainerComposite, SWT.BORDER, false, jointBet.getGameType().getNumbersMatrixArray()[1].getNumbers(), matrix2Rows, matrix2Columns, matrix2MinNumber, matrix2MaxNumber, firstCellEmpty);
numbersMatrixWidget2.setLayoutData(new GridData(SWT.LEFT, SWT.BOTTOM, false, false, 1, 1));
Composite fillNumbersComposite = new Composite(shell, SWT.NONE);
fillNumbersComposite.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, false, false, 1, 1));
fillNumbersComposite.setLayout(new GridLayout(1, false));
Composite compositeFillMatrix1 = new Composite(fillNumbersComposite, SWT.NONE);
compositeFillMatrix1.setLayout(new GridLayout(4, false));
Label lblFillMatrix1WithMostCommonNumbers1 = new Label(compositeFillMatrix1, SWT.NONE);
lblFillMatrix1WithMostCommonNumbers1.setText("Rellenar Matriz 1 con los");
Spinner matrix1NumbersSpinner = new Spinner(compositeFillMatrix1, SWT.BORDER);
matrix1NumbersSpinner.setMaximum(jointBet.getGameType().getNumbersMatrixArray()[0].getPossibleNumbersCount());
matrix1NumbersSpinner.setMinimum(1);
Label lblFillMatrix1WithMostCommonNumbers2 = new Label(compositeFillMatrix1, SWT.NONE);
lblFillMatrix1WithMostCommonNumbers2.setText("números mas repetidos:");
Button btnFillMatrix1 = new Button(compositeFillMatrix1, SWT.NONE);
btnFillMatrix1.setText("Rellenar");
btnFillMatrix1.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
String gameType = jointBet.getGameType().getType();
int matrix = 1;
int amount = Integer.parseInt(matrix1NumbersSpinner.getText());
numbersMatrixWidget1.setNumbers(StatisticsManager.getInstance().getMostUsedNumberKeys(gameType, matrix, amount));
}
});
Composite compositeFillMatrix2 = new Composite(fillNumbersComposite, SWT.NONE);
compositeFillMatrix2.setLayout(new GridLayout(4, false));
Label lblFillMatrix2WithMostCommonNumbers1 = new Label(compositeFillMatrix2, SWT.NONE);
lblFillMatrix2WithMostCommonNumbers1.setText("Rellenar Matriz 2 con los");
Spinner matrix2NumbersSpinner = new Spinner(compositeFillMatrix2, SWT.BORDER);
matrix2NumbersSpinner.setMaximum(jointBet.getGameType().getNumbersMatrixArray()[1].getPossibleNumbersCount());
matrix2NumbersSpinner.setMinimum(1);
Label lblFillMatrix2WithMostCommonNumbers2 = new Label(compositeFillMatrix2, SWT.NONE);
lblFillMatrix2WithMostCommonNumbers2.setText("números mas repetidos:");
Button btnFillMatrix2 = new Button(compositeFillMatrix2, SWT.NONE);
btnFillMatrix2.setText("Rellenar");
btnFillMatrix2.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
String gameType = jointBet.getGameType().getType();
int matrix = 2;
int amount = Integer.parseInt(matrix2NumbersSpinner.getText());
numbersMatrixWidget2.setNumbers(StatisticsManager.getInstance().getMostUsedNumberKeys(gameType, matrix, amount));
}
});
Composite buttonsComposite = new Composite(shell, SWT.NONE);
FillLayout fl_buttonsComposite = new FillLayout(SWT.HORIZONTAL);
fl_buttonsComposite.marginHeight = 10;
fl_buttonsComposite.spacing = 40;
buttonsComposite.setLayout(fl_buttonsComposite);
GridData gd_buttonsComposite = new GridData(SWT.CENTER, SWT.CENTER, false, false, 1, 1);
gd_buttonsComposite.heightHint = 45;
buttonsComposite.setLayoutData(gd_buttonsComposite);
Button acceptButton = new Button(buttonsComposite, SWT.NONE);
acceptButton.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
//matrix 1
matrixNumbers1.clear();
for (Button b : numbersMatrixWidget1.getButtons()) {
if (b.getSelection()) {
matrixNumbers1.add(Integer.parseInt(b.getText()));
}
}
//matrix 2
matrixNumbers2.clear();
for (Button b : numbersMatrixWidget2.getButtons()) {
if (b.getSelection()) {
matrixNumbers2.add(Integer.parseInt(b.getText()));
}
}
if (matrixNumbers1.size()<jointBet.getGameType().getNumbersMatrixArray()[0].getNumbersPerBet() || matrixNumbers2.size()<jointBet.getGameType().getNumbersMatrixArray()[1].getNumbersPerBet()) {
ErrorDialog dialog = new ErrorDialog(shell, SWT.DIALOG_TRIM | SWT.PRIMARY_MODAL, "El mínimo de números es "+jointBet.getGameType().getNumbersMatrixArray()[0].getNumbersPerBet()+" + "+jointBet.getGameType().getNumbersMatrixArray()[1].getNumbersPerBet());
dialog.open();
}else {
Collections.sort(matrixNumbers1);
Collections.sort(matrixNumbers2);
jointBet.setNumbers(0, matrixNumbers1);
jointBet.setNumbers(1, matrixNumbers2);
DataManager.getInstance().saveData();
result = true;
shell.close();
}
}
});
acceptButton.setBounds(0, 0, 75, 25);
acceptButton.setText("Aceptar");
Button cancelButton = new Button(buttonsComposite, SWT.NONE);
cancelButton.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
result = false;
shell.close();
}
});
cancelButton.setBounds(0, 0, 75, 25);
cancelButton.setText("Cancelar");
shell.setDefaultButton(acceptButton);
shell.open();
shell.layout();
shell.pack(); //for wrap the dialog size to it's content width and height.
//the dialog must be centered after doing shell.pack();
Rectangle parentSize = getParent().getBounds();
Rectangle shellSize = shell.getBounds();
int x = parentSize.x + (parentSize.width - shellSize.width) / 2;
int y = (int) (parentSize.y + (parentSize.height - shellSize.height) / 3.5);
shell.setLocation(new Point(x, y));
Display display = getParent().getDisplay();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
return result;
}
/**
* Create contents of the dialog.
*/
private void createContents() {
shell = new Shell(getParent(), getStyle());
shell.setText(getText());
}
}
回答1:
Just move the shell.open() to the end of the size calculations - after the shell.setLocation.
来源：https://stackoverflow.com/questions/57496640/when-centering-dialog-first-appears-on-topleft-corner-for-some-milliseconds