Java Code Examples for com.vaadin.shared.ui.dd.VerticalDropLocation#MIDDLE

/**
 * Returns the vertical drop location
 * 
 * @param cell
 *            The cell details
 * @param event
 *            The drag event
 * @return
 */
protected VerticalDropLocation getVerticalDropLocation(CellDetails cell,
        VDragEvent event) {

    // Get the vertical location
    VerticalDropLocation vdetail;
    int y = Util.getTouchOrMouseClientY(event.getCurrentGwtEvent())
            - getAbsoluteTop() - cell.y;

    assert(y >= 0 && y <= cell.height);

    if (y < cell.height * cellTopBottomDropRatio) {
        vdetail = VerticalDropLocation.TOP;
    } else if (y < cell.height * (1.0 - cellTopBottomDropRatio)) {
        vdetail = VerticalDropLocation.MIDDLE;
    } else {
        vdetail = VerticalDropLocation.BOTTOM;
    }
    return vdetail;
}
 

/**
 * Get the vertical drop location in a ordered layout
 * 
 * @param element
 *            The target element or cell
 * @param offsetHeight
 *            The height of the cell
 * @param clientY
 *            The width of the cell
 * @param topBottomRatio
 *            The ratio of the cell
 * @return The location of the drop
 */
public static VerticalDropLocation getVerticalDropLocation(Element element,
        int offsetHeight, int clientY, double topBottomRatio) {

    int absoluteTop = element.getAbsoluteTop();
    int fromTop = clientY - absoluteTop;

    float percentageFromTop = (fromTop / (float) offsetHeight);
    if (percentageFromTop < topBottomRatio) {
        return VerticalDropLocation.TOP;
    } else if (percentageFromTop > 1 - topBottomRatio) {
        return VerticalDropLocation.BOTTOM;
    } else {
        return VerticalDropLocation.MIDDLE;
    }
}
 

/**
 * Empasises the drop location of the component when hovering over a
 * ĆhildComponentContainer. Passing null as the container removes any
 * previous emphasis.
 * 
 * @param container
 *            The container which we are hovering over
 * @param event
 *            The drag event
 */
protected void emphasis(Widget container, VDragEvent event) {

    // Remove emphasis from previous hovers
    deEmphasis();

    // validate container
    if (container == null
            || !getElement().isOrHasChild(container.getElement())) {
        return;
    }

    currentlyEmphasised = container;

    VerticalDropLocation location = null;

    // Add drop location specific style
    if (currentlyEmphasised != this) {
        location = getVerticalDropLocation(currentlyEmphasised, event);

    } else {
        location = VerticalDropLocation.MIDDLE;
    }

    UIObject.setStyleName(currentlyEmphasised.getElement(), OVER, true);
    UIObject.setStyleName(currentlyEmphasised.getElement(),
            OVER + "-" + location.toString().toLowerCase(), true);
}
 

/**
 * Updates the drop details while dragging. This is needed to ensure client
 * side criterias can validate the drop location.
 * 
 * @param event
 *            The drag event
 */
protected void updateDragDetails(VDragEvent event) {
    Element over = event.getElementOver();

    // Resolve where the drop was made
    VerticalDropLocation location = null;
    Widget content = null;
    if (firstContainer.isOrHasChild(over)) {
        location = VerticalDropLocation.TOP;
        content = Util.findWidget(firstContainer, null);
    } else if (splitter.isOrHasChild(over)) {
        location = VerticalDropLocation.MIDDLE;
        content = this;
    } else if (secondContainer.isOrHasChild(over)) {
        location = VerticalDropLocation.BOTTOM;
        content = Util.findWidget(secondContainer, null);
    }

    event.getDropDetails().put(Constants.DROP_DETAIL_VERTICAL_DROP_LOCATION,
            location);

    if (content != null) {
        event.getDropDetails().put(Constants.DROP_DETAIL_OVER_CLASS,
                content.getClass().getName());
    } else {
        event.getDropDetails().put(Constants.DROP_DETAIL_OVER_CLASS,
                this.getClass().getName());
    }

    // Add mouse event details
    MouseEventDetails details = MouseEventDetailsBuilder
            .buildMouseEventDetails(event.getCurrentGwtEvent(),
                    getElement());
    event.getDropDetails().put(Constants.DROP_DETAIL_MOUSE_EVENT,
            details.serialize());
}
 

/**
 * Empasises the drop location of the component when hovering over a
 * ĆhildComponentContainer. Passing null as the container removes any
 * previous emphasis.
 * 
 * @param container
 *            The container which we are hovering over
 * @param event
 *            The drag event
 */
protected void emphasis(Widget container, VDragEvent event) {

    // Remove emphasis from previous hovers
    deEmphasis();

    // validate container
    if (container == null
            || !getElement().isOrHasChild(container.getElement())) {
        return;
    }

    currentlyEmphasised = container;

    VerticalDropLocation location = null;

    // Add drop location specific style
    if (currentlyEmphasised != this) {
        location = getVerticalDropLocation(currentlyEmphasised, event);

    } else {
        location = VerticalDropLocation.MIDDLE;
    }

    setStyleName(currentlyEmphasised.getElement(), OVER, true);
    setStyleName(currentlyEmphasised.getElement(),
            OVER + "-" + location.toString().toLowerCase(), true);
}
 

/**
 * Emphasisizes a container element
 * 
 * @param element
 */
protected void emphasis(Element element, VDragEvent event) {

    // Find the tab
    StackItem tab = WidgetUtil.findWidget(element, StackItem.class);
    if (tab != null && getElement().isOrHasChild(tab.getElement())
            && currentlyEmphasised != tab) {
        VerticalDropLocation location = getDropLocation(tab, event);

        if (location == VerticalDropLocation.MIDDLE) {
            if (tab.isOpen()) {
                tab.addStyleName(CLASSNAME_OVER);
            } else {
                tab.getWidget(0).addStyleName(CLASSNAME_OVER);
            }
        } else if (!spacer.isAttached()) {
            if (location == VerticalDropLocation.TOP) {
                insertSpacer(spacer, getElement(), getWidgetIndex(tab));
                tab.setHeight(
                        (tab.getOffsetHeight() - spacer.getOffsetHeight())
                                + "px");
            } else if (location == VerticalDropLocation.BOTTOM) {
                insertSpacer(spacer, getElement(), getWidgetIndex(tab) + 1);
                int newHeight = tab.getOffsetHeight()
                        - spacer.getOffsetHeight();
                if (getWidgetIndex(spacer) == getWidgetCount() - 1) {
                    newHeight -= spacer.getOffsetHeight();
                }
                if (newHeight >= 0) {
                    tab.setHeight(newHeight + "px");
                }
            }
        }
        currentlyEmphasised = tab;
    }
}
 

@Override
protected void handleHTML5Drop(DragAndDropEvent event) {
    VerticalLayoutTargetDetails details = (VerticalLayoutTargetDetails) event
            .getTargetDetails();
    AbstractOrderedLayout layout = (AbstractOrderedLayout) details
            .getTarget();
    int idx = (details).getOverIndex();

    // Increase index if component is dropped after or above a
    // previous
    // component
    VerticalDropLocation loc = (details).getDropLocation();
    if (loc == VerticalDropLocation.MIDDLE
            || loc == VerticalDropLocation.BOTTOM) {
        idx++;
    }

    Component comp = resolveComponentFromHTML5Drop(event);

    // Add component
    if (idx >= 0) {
        layout.addComponent(comp, idx);
    } else {
        layout.addComponent(comp);
    }

    // Add component alignment if given
    if (dropAlignment != null) {
        layout.setComponentAlignment(comp, dropAlignment);
    }

}
 

@Override
protected void handleHTML5Drop(DragAndDropEvent event) {
    VerticalLayoutTargetDetails details = (VerticalLayoutTargetDetails) event
            .getTargetDetails();
    AbstractOrderedLayout layout = (AbstractOrderedLayout) details
            .getTarget();
    int idx = (details).getOverIndex();

    // Increase index if component is dropped after or above a
    // previous
    // component
    VerticalDropLocation loc = (details).getDropLocation();
    if (loc == VerticalDropLocation.MIDDLE
            || loc == VerticalDropLocation.BOTTOM) {
        idx++;
    }

    Component comp = resolveComponentFromHTML5Drop(event);

    // Add component
    if (idx >= 0) {
        layout.addComponent(comp, idx);
    } else {
        layout.addComponent(comp);
    }

    // Add component alignment if given
    if (dropAlignment != null) {
        layout.setComponentAlignment(comp, dropAlignment);
    }

}
 

@Override
protected void handleHTML5Drop(DragAndDropEvent event) {
    FormLayoutTargetDetails details = (FormLayoutTargetDetails) event
            .getTargetDetails();
    int idx = details.getOverIndex();
    AbstractOrderedLayout layout = (AbstractOrderedLayout) details
            .getTarget();

    // Increase index if component is dropped after or above a
    // previous component
    VerticalDropLocation loc = details.getDropLocation();
    if (loc == VerticalDropLocation.MIDDLE
            || loc == VerticalDropLocation.BOTTOM) {
        idx++;
    }

    // Add component
    if (idx >= 0) {
        layout.addComponent(resolveComponentFromHTML5Drop(event), idx);
    } else {
        layout.addComponent(resolveComponentFromHTML5Drop(event));
    }

    // Add component alignment if given
    if (dropAlignment != null) {
        layout.setComponentAlignment(resolveComponentFromHTML5Drop(event),
                dropAlignment);
    }
}
 

/**
 * Called when a component changed location within the layout
 * 
 * @param event
 *            The drag and drop event
 */
@Override
protected void handleComponentReordering(DragAndDropEvent event) {
    // Component re-ordering
    LayoutBoundTransferable transferable = (LayoutBoundTransferable) event
            .getTransferable();
    VerticalLayoutTargetDetails details = (VerticalLayoutTargetDetails) event
            .getTargetDetails();
    AbstractOrderedLayout layout = (AbstractOrderedLayout) details
            .getTarget();
    Component comp = transferable.getComponent();
    int idx = details.getOverIndex();
    int oldIndex = layout.getComponentIndex(comp);

    if (idx == oldIndex) {
        // Index did not change
        return;
    }

    // Detach
    layout.removeComponent(comp);

    // Account for detachment if new index is bigger then old index
    if (idx > oldIndex) {
        idx--;
    }

    // Increase index if component is dropped after or above a previous
    // component
    VerticalDropLocation loc = details.getDropLocation();
    if (loc == VerticalDropLocation.MIDDLE
            || loc == VerticalDropLocation.BOTTOM) {
        idx++;
    }

    // Add component
    if (idx >= 0) {
        layout.addComponent(comp, idx);
    } else {
        layout.addComponent(comp);
    }

    // Add component alignment if given
    if (dropAlignment != null) {
        layout.setComponentAlignment(comp, dropAlignment);
    }

}
 

/**
 * Handle a drop from another layout
 * 
 * @param event
 *            The drag and drop event
 */
@Override
protected void handleDropFromLayout(DragAndDropEvent event) {
    LayoutBoundTransferable transferable = (LayoutBoundTransferable) event
            .getTransferable();
    VerticalLayoutTargetDetails details = (VerticalLayoutTargetDetails) event
            .getTargetDetails();
    AbstractOrderedLayout layout = (AbstractOrderedLayout) details
            .getTarget();
    Component source = event.getTransferable().getSourceComponent();
    int idx = (details).getOverIndex();
    Component comp = transferable.getComponent();

    // Check that we are not dragging an outer layout into an inner
    // layout
    Component parent = layout.getParent();
    while (parent != null) {
        if (parent == comp) {
            return;
        }
        parent = parent.getParent();
    }

    // Detach from old source
    if (source instanceof ComponentContainer) {
        ((ComponentContainer) source).removeComponent(comp);
    } else if (source instanceof SingleComponentContainer) {
        ((SingleComponentContainer) source).setContent(null);
    }

    // Increase index if component is dropped after or above a
    // previous
    // component
    VerticalDropLocation loc = (details).getDropLocation();
    if (loc == VerticalDropLocation.MIDDLE
            || loc == VerticalDropLocation.BOTTOM) {
        idx++;
    }

    // Add component
    if (idx >= 0) {
        layout.addComponent(comp, idx);
    } else {
        layout.addComponent(comp);
    }

    // Add component alignment if given
    if (dropAlignment != null) {
        layout.setComponentAlignment(comp, dropAlignment);
    }
}
 

/**
 * Called when a component changed location within the layout
 * 
 * @param event
 *            The drag and drop event
 */
@Override
protected void handleComponentReordering(DragAndDropEvent event) {
    // Component re-ordering
    LayoutBoundTransferable transferable = (LayoutBoundTransferable) event
            .getTransferable();
    VerticalLayoutTargetDetails details = (VerticalLayoutTargetDetails) event
            .getTargetDetails();
    AbstractOrderedLayout layout = (AbstractOrderedLayout) details
            .getTarget();
    Component comp = transferable.getComponent();
    int idx = details.getOverIndex();
    int oldIndex = layout.getComponentIndex(comp);

    if (idx == oldIndex) {
        // Index did not change
        return;
    }

    // Detach
    layout.removeComponent(comp);

    // Account for detachment if new index is bigger then old index
    if (idx > oldIndex) {
        idx--;
    }

    // Increase index if component is dropped after or above a previous
    // component
    VerticalDropLocation loc = details.getDropLocation();
    if (loc == VerticalDropLocation.MIDDLE
            || loc == VerticalDropLocation.BOTTOM) {
        idx++;
    }

    // Add component
    if (idx >= 0) {
        layout.addComponent(comp, idx);
    } else {
        layout.addComponent(comp);
    }

    // Add component alignment if given
    if (dropAlignment != null) {
        layout.setComponentAlignment(comp, dropAlignment);
    }

}
 

/**
 * Handle a drop from another layout
 * 
 * @param event
 *            The drag and drop event
 */
@Override
protected void handleDropFromLayout(DragAndDropEvent event) {
    LayoutBoundTransferable transferable = (LayoutBoundTransferable) event
            .getTransferable();
    VerticalLayoutTargetDetails details = (VerticalLayoutTargetDetails) event
            .getTargetDetails();
    AbstractOrderedLayout layout = (AbstractOrderedLayout) details
            .getTarget();
    Component source = event.getTransferable().getSourceComponent();
    int idx = (details).getOverIndex();
    Component comp = transferable.getComponent();

    // Check that we are not dragging an outer layout into an inner
    // layout
    Component parent = layout.getParent();
    while (parent != null) {
        if (parent == comp) {
            return;
        }
        parent = parent.getParent();
    }

    // Detach from old source
    if (source instanceof ComponentContainer) {
        ((ComponentContainer) source).removeComponent(comp);
    } else if (source instanceof SingleComponentContainer) {
        ((SingleComponentContainer) source).setContent(null);
    }

    // Increase index if component is dropped after or above a
    // previous
    // component
    VerticalDropLocation loc = (details).getDropLocation();
    if (loc == VerticalDropLocation.MIDDLE
            || loc == VerticalDropLocation.BOTTOM) {
        idx++;
    }

    // Add component
    if (idx >= 0) {
        layout.addComponent(comp, idx);
    } else {
        layout.addComponent(comp);
    }

    // Add component alignment if given
    if (dropAlignment != null) {
        layout.setComponentAlignment(comp, dropAlignment);
    }
}
 

@Override
protected void handleComponentReordering(DragAndDropEvent event) {
    LayoutBoundTransferable transferable = (LayoutBoundTransferable) event
            .getTransferable();
    FormLayoutTargetDetails details = (FormLayoutTargetDetails) event
            .getTargetDetails();
    DDFormLayout layout = (DDFormLayout) details.getTarget();

    Component comp = transferable.getComponent();
    int idx = details.getOverIndex();
    int oldIdx = layout.getComponentIndex(comp);

    if (idx == oldIdx) {
        // Dropping on myself
        return;
    }

    // Detach
    layout.removeComponent(comp);
    if (idx > 0 && idx > oldIdx) {
        idx--;
    }

    // Increase index if component is dropped after or above a previous
    // component
    VerticalDropLocation loc = details.getDropLocation();
    if (loc == VerticalDropLocation.MIDDLE
            || loc == VerticalDropLocation.BOTTOM) {
        idx++;
    }

    // Add component
    if (idx >= 0) {
        layout.addComponent(comp, idx);
    } else {
        layout.addComponent(comp);
    }

    // Add component alignment if given
    if (dropAlignment != null) {
        layout.setComponentAlignment(comp, dropAlignment);
    }
}
 

@Override
protected void handleDropFromLayout(DragAndDropEvent event) {
    LayoutBoundTransferable transferable = (LayoutBoundTransferable) event
            .getTransferable();
    FormLayoutTargetDetails details = (FormLayoutTargetDetails) event
            .getTargetDetails();
    AbstractOrderedLayout layout = (AbstractOrderedLayout) details
            .getTarget();
    Component source = event.getTransferable().getSourceComponent();
    int idx = details.getOverIndex();
    Component comp = transferable.getComponent();

    // Check that we are not dragging an outer layout into an inner
    // layout
    Component parent = layout.getParent();
    while (parent != null) {
        if (parent == comp) {
            return;
        }
        parent = parent.getParent();
    }

    // Detach from old source
    if (source instanceof ComponentContainer) {
        ((ComponentContainer) source).removeComponent(comp);
    } else if (source instanceof SingleComponentContainer) {
        ((SingleComponentContainer) source).setContent(null);
    }

    // Increase index if component is dropped after or above a
    // previous
    // component
    VerticalDropLocation loc = (details).getDropLocation();
    if (loc == VerticalDropLocation.MIDDLE
            || loc == VerticalDropLocation.BOTTOM) {
        idx++;
    }

    // Add component
    if (idx >= 0) {
        layout.addComponent(comp, idx);
    } else {
        layout.addComponent(comp);
    }

    // Add component alignment if given
    if (dropAlignment != null) {
        layout.setComponentAlignment(comp, dropAlignment);
    }
}