Java VDragEvent类代码示例

import com.vaadin.client.ui.dd.VDragEvent; //导入依赖的package包/类
@Override
// Exception squid:S1166 - Hide origin exception
// Exception squid:S2221 - This code is trans-coded to JavaScript, hence
// Exception semantics changes
@SuppressWarnings({ "squid:S1166", "squid:S2221" })
protected boolean accept(VDragEvent drag, UIDL configuration) {
    try {

        String component = drag.getTransferable().getDragSource().getWidget().getElement().getId();
        int c = configuration.getIntAttribute(COMPONENT_COUNT);
        String mode = configuration.getStringAttribute(MODE);
        for (int dragSourceIndex = 0; dragSourceIndex < c; dragSourceIndex++) {
            String requiredPid = configuration.getStringAttribute(COMPONENT + dragSourceIndex);
            if ((STRICT_MODE.equals(mode) && component.equals(requiredPid))
                    || (PREFIX_MODE.equals(mode) && component.startsWith(requiredPid))) {
                return true;
            }

        }
    } catch (Exception e) {
        // log and continue
        LOGGER.log(Level.SEVERE, "Error verifying drop target: " + e.getLocalizedMessage());
    }
    return false;
}
 

import com.vaadin.client.ui.dd.VDragEvent; //导入依赖的package包/类
/**
 * Styles a multi-row selection with the number of elements.
 *
 * @param drag
 *            the current drag event holding the context.
 */
void setMultiRowDragDecoration(VDragEvent drag) {
    Widget widget = drag.getTransferable().getDragSource().getWidget();

    if (widget instanceof VScrollTable) {
        VScrollTable table = (VScrollTable) widget;
        int rowCount = table.selectedRowKeys.size();

        Element dragCountElement = Document.get().getElementById(SP_DRAG_COUNT);
        if (rowCount > 1 && table.selectedRowKeys.contains(table.focusedRow.getKey())) {
            if (dragCountElement == null) {
                dragCountElement = Document.get().createStyleElement();
                dragCountElement.setId(SP_DRAG_COUNT);
                HeadElement head = HeadElement.as(Document.get().getElementsByTagName(HeadElement.TAG).getItem(0));
                head.appendChild(dragCountElement);
            }
            SafeHtml formattedCssStyle = getDraggableTemplate().multiSelectionStyle(determineActiveTheme(drag),
                    String.valueOf(rowCount));
            StyleElement dragCountStyleElement = StyleElement.as(dragCountElement);
            dragCountStyleElement.setInnerSafeHtml(formattedCssStyle);
        } else if (dragCountElement != null) {
            dragCountElement.removeFromParent();
        }
    }
}
 

import com.vaadin.client.ui.dd.VDragEvent; //导入依赖的package包/类
/**
 * Checks if this accept criterion is responsible for the current drag
 * source. Therefore the current drag source id has to start with the drag
 * source id-prefix configured for the criterion.
 *
 * @param drag
 *            the current drag event holding the context.
 * @param configuration
 *            for the accept criterion to retrieve the configured drag
 *            source id-prefix.
 * @return <code>true</code> if the criterion is responsible for the current
 *         drag source, otherwise <code>false</code>.
 */
// Exception squid:S1166 - Hide origin exception
// Exception squid:S2221 - This code is trans-coded to JavaScript, hence
// Exception semantics changes
@SuppressWarnings({ "squid:S1166", "squid:S2221" })
boolean isValidDragSource(final VDragEvent drag, final UIDL configuration) {
    try {
        final String dragSource = drag.getTransferable().getDragSource().getWidget().getElement().getId();
        final String dragSourcePrefix = configuration.getStringAttribute(DRAG_SOURCE);
        if (dragSource.startsWith(dragSourcePrefix)) {
            return true;
        }
    } catch (final Exception e) {
        // log and continue
        LOGGER.log(Level.SEVERE, "Error verifying drag source: " + e.getLocalizedMessage());
    }

    return false;
}
 

import com.vaadin.client.ui.dd.VDragEvent; //导入依赖的package包/类
@Test
@Description("Verifies that drag source is valid for the configured prefix")
public void checkDragSourceWithValidId() {
    final ViewComponentClientCriterion cut = new ViewComponentClientCriterion();

    // prepare drag-event:
    final String prefix = "this";
    final String id = "thisId";
    final VDragEvent dragEvent = CriterionTestHelper.createMockedVDragEvent(id);

    // prepare configuration:
    final UIDL uidl = GWT.create(UIDL.class);
    when(uidl.getStringAttribute("ds")).thenReturn(prefix);

    // act
    final boolean result = cut.isValidDragSource(dragEvent, uidl);

    // assure that drag source is valid: [thisId startsWith this]
    assertThat(result).as("Expected: [" + id + " startsWith " + prefix + "].").isTrue();
}
 

import com.vaadin.client.ui.dd.VDragEvent; //导入依赖的package包/类
@Test
@Description("Verifies that drag source is not valid for the configured prefix")
public void checkDragSourceWithInvalidId() {
    final ViewComponentClientCriterion cut = new ViewComponentClientCriterion();

    // prepare drag-event:
    final String prefix = "this";
    final String id = "notThis";
    final VDragEvent dragEvent = CriterionTestHelper.createMockedVDragEvent(id);

    // prepare configuration:
    final UIDL uidl = GWT.create(UIDL.class);
    when(uidl.getStringAttribute("ds")).thenReturn(prefix);

    // act
    final boolean result = cut.isValidDragSource(dragEvent, uidl);

    // assure that drag source is valid: [thisId !startsWith this]
    assertThat(result).as("Expected: [" + id + " !startsWith " + prefix + "].").isFalse();
}
 

import com.vaadin.client.ui.dd.VDragEvent; //导入依赖的package包/类
@Test
@Description("An exception occures while the drag source is validated against the configured prefix")
public void exceptionWhenCheckingDragSource() {

    final ViewComponentClientCriterion cut = new ViewComponentClientCriterion();

    // prepare drag-event:
    final String prefix = "this";
    final String id = "notThis";
    final VDragEvent dragEvent = CriterionTestHelper.createMockedVDragEvent(id);
    doThrow(new RuntimeException()).when(dragEvent).getTransferable();

    // prepare configuration:
    final UIDL uidl = GWT.create(UIDL.class);
    when(uidl.getStringAttribute("ds")).thenReturn(prefix);

    // act
    Boolean result = null;
    try {
        result = cut.isValidDragSource(dragEvent, uidl);
    } catch (final Exception ex) {
        fail("Exception is not re-thrown");
    }

    // assure that in case of exception the drag source is declared invalid
    assertThat(result).as("Expected: Invalid drag if exception occures.").isFalse();
}
 

import com.vaadin.client.ui.dd.VDragEvent; //导入依赖的package包/类
@Test
@Description("Check multi row drag decoration with non-table widget")
public void processMultiRowDragDecorationNonTable() {
    final ViewClientCriterion cut = new ViewClientCriterion();

    // prepare drag-event with non table widget:
    final VDragAndDropWrapper nonTable = Mockito.mock(VDragAndDropWrapper.class);
    final VDragEvent dragEvent = CriterionTestHelper.createMockedVDragEvent("thisId", nonTable);
    final Document document = Document.get();

    // act
    cut.setMultiRowDragDecoration(dragEvent);

    // assure that multi-row decoration processing was skipped
    verify(document, Mockito.never()).getElementById(ViewClientCriterion.SP_DRAG_COUNT);
}
 

import com.vaadin.client.ui.dd.VDragEvent; //导入依赖的package包/类
@Test
@Description("Verifies that drag source is not valid for the configured id (strict mode)")
public void noMatchInStrictMode() {
    final ItemIdClientCriterion cut = new ItemIdClientCriterion();

    // prepare drag-event:
    final String testId = "thisId";
    final VDragEvent dragEvent = CriterionTestHelper.createMockedVDragEvent(testId);

    // prepare configuration:
    final UIDL uidl = GWT.create(UIDL.class);
    final String configuredId = "component0";
    final String id = "this";
    when(uidl.getStringAttribute(configuredId)).thenReturn(id);
    final String configuredMode = "m";
    final String strictMode = "s";
    when(uidl.getStringAttribute(configuredMode)).thenReturn(strictMode);
    final String count = "c";
    when(uidl.getIntAttribute(count)).thenReturn(1);

    // act
    final boolean result = cut.accept(dragEvent, uidl);

    // verify that in strict mode: [thisId !equals this]
    assertThat(result).as("Expected: [" + id + " !equals " + testId + "].").isFalse();
}
 

import com.vaadin.client.ui.dd.VDragEvent; //导入依赖的package包/类
@Override
protected void dragAccepted(VDragEvent drag) {
    deEmphasis();
    currentTargetElement = drag.getElementOver();
    currentTargetDay = WidgetUtil.findWidget(currentTargetElement,
            DateCell.class);
    emphasis();
}
 

import com.vaadin.client.ui.dd.VDragEvent; //导入依赖的package包/类
@Override
public void dragOver(final VDragEvent drag) {
    if (isLocationValid(drag.getElementOver())) {
        validate(new VAcceptCallback() {
            @Override
            public void accepted(VDragEvent event) {
                dragAccepted(drag);
            }
        }, drag);
    }
}
 

import com.vaadin.client.ui.dd.VDragEvent; //导入依赖的package包/类
@Override
public boolean drop(VDragEvent drag) {
    if (isLocationValid(drag.getElementOver())) {
        updateDropDetails(drag);
        deEmphasis();
        return super.drop(drag);

    } else {
        deEmphasis();
        return false;
    }
}
 

import com.vaadin.client.ui.dd.VDragEvent; //导入依赖的package包/类
/**
 * Update the drop details sent to the server
 *
 * @param drag
 *            The drag event
 */
private void updateDropDetails(VDragEvent drag) {
    int slotIndex = currentTargetDay.getSlotIndex(currentTargetElement);
    int dayIndex = calendarConnector.getWidget().getWeekGrid()
            .getDateCellIndex(currentTargetDay);

    drag.getDropDetails().put("dropDayIndex", dayIndex);
    drag.getDropDetails().put("dropSlotIndex", slotIndex);
}
 

import com.vaadin.client.ui.dd.VDragEvent; //导入依赖的package包/类
@Override
protected void dragAccepted(VDragEvent drag) {
    deEmphasis();
    currentTargetElement = drag.getElementOver();
    currentTargetDay = WidgetUtil.findWidget(currentTargetElement,
            SimpleDayCell.class);
    emphasis();
}
 

import com.vaadin.client.ui.dd.VDragEvent; //导入依赖的package包/类
/**
 * Updates the drop details sent to the server
 *
 * @param drag
 *            The drag event
 */
private void updateDropDetails(VDragEvent drag) {
    int dayIndex = calendarConnector.getWidget().getMonthGrid()
            .getDayCellIndex(currentTargetDay);

    drag.getDropDetails().put("dropDayIndex", dayIndex);
}
 

import com.vaadin.client.ui.dd.VDragEvent; //导入依赖的package包/类
@Override
// Exception squid:S1604 - GWT 2.7 does not support Java 8
@SuppressWarnings("squid:S1604")
public void accept(final VDragEvent drag, final UIDL configuration, final VAcceptCallback callback) {

    if (isDragStarting(drag)) {
        final NativePreviewHandler nativeEventHandler = new NativePreviewHandler() {
            @Override
            public void onPreviewNativeEvent(NativePreviewEvent event) {
                if (isEscKey(event) || isMouseUp(event)) {
                    try {
                        hideDropTargetHints(configuration);
                    } finally {
                        nativeEventHandlerRegistration.removeHandler();
                    }
                }
            }
        };

        nativeEventHandlerRegistration = Event.addNativePreviewHandler(nativeEventHandler);
        setMultiRowDragDecoration(drag);
    }

    int childCount = configuration.getChildCount();
    accepted = false;
    for (int childIndex = 0; childIndex < childCount; childIndex++) {
        VAcceptCriterion crit = getCriteria(configuration, childIndex);
        crit.accept(drag, configuration.getChildUIDL(childIndex), this);
        if (Boolean.TRUE.equals(accepted)) {
            callback.accepted(drag);
            return;
        }
    }

    // if no VAcceptCriterion accepts and the mouse is release, an error
    // message is shown
    if (Event.ONMOUSEUP == Event.getTypeInt(drag.getCurrentGwtEvent().getType())) {
        showErrorNotification(drag);
    }
}