org.eclipse.swt.widgets.Table#isDisposed ( )源码实例Demo

void recreateViewer() {
	if (viewer == null) { return; }
	final Table table = viewer.getTable();
	if (table.isDisposed()) { return; }
	table.dispose();
	createViewer(getParentComposite());
	getParentComposite().layout(true);
}
 

/**
 * Checks if the text or shell has focus. If not, closes the shell.
 *
 * @param table
 *            the shell's table
 * @param text
 *            the search text field
 */
protected void checkFocusLost(final Table table, final Text text) {
	if (!shell.isDisposed() && !table.isDisposed() && !text.isDisposed()) {
		if (table.getDisplay().getActiveShell() == table.getShell()) {
			// If the user selects the trim shell, leave focus on the text
			// so shell stays open
			text.setFocus();
			return;
		}
		if (!shell.isFocusControl() && !table.isFocusControl() && !text.isFocusControl()) {
			quickAccessContents.doClose();
		}
	}
}
 

@Override
public void verifyKey(VerifyEvent event) {

    if (!event.doit)
        return;

    if (event.character == 0) {

        switch (event.keyCode) {

            case SWT.ARROW_DOWN:
                //special case: 
                //if there's a key dialog with a table shown, set its focus when down is pressed
                synchronized (lock) {
                    KeyAssistDialog tempKeyAssistDialog = this.keyAssistDialog;
                    if (tempKeyAssistDialog != null) {
                        Table completionsTable = this.keyAssistDialog.getCompletionsTable();
                        if (completionsTable != null && !completionsTable.isDisposed()) {
                            completionsTable.setFocus();
                            completionsTable.setSelection(0);
                            event.doit = false;
                            break;
                        }
                    }
                }
                // ALT, CTRL, ARROW_LEFT, ARROW_RIGHT == leave
            case SWT.ARROW_LEFT:
            case SWT.ARROW_RIGHT:
            case SWT.HOME:
            case SWT.END:
            case SWT.PAGE_DOWN:
            case SWT.PAGE_UP:
            case SWT.ARROW_UP:
                leave();
                break;

        }

        // event.character != 0
    } else {

        switch (event.character) {

        // ESC = quit
            case 0x1B:
                leave();
                event.doit = false;
                break;

            //CR = exec and quit
            case 0x0D:
                boolean executed = doExec();
                event.doit = false;
                if (!executed) {
                    return; //we don't want to update the status
                }
                break;

            // backspace    and delete
            case 0x08:
            case 0x7F:
                removeLastCharSearch();
                event.doit = false;
                break;

            default:
                if (event.stateMask == 0 || event.stateMask == SWT.SHIFT || event.stateMask == (SWT.ALT | SWT.CTRL)) { // SWT.ALT | SWT.CTRL covers AltGr (see bug 43049)
                    event.doit = false;
                    if (addCharSearch(event.character)) {
                        //ok, triggered some automatic action (does not need enter)
                        executed = doExec();
                        if (!executed) {
                            return; //we don't want to update the status
                        }

                    }
                }
                break;
        }
    }
    updateStatus();
}