org.roda.wui.client.common.popup.CalloutPopup.java Source code

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Here is the source code for org.roda.wui.client.common.popup.CalloutPopup.java

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/**
 * The contents of this file are subject to the license and copyright
 * detailed in the LICENSE file at the root of the source
 * tree and available online at
 *
 * https://github.com/keeps/roda
 */
package org.roda.wui.client.common.popup;

import org.roda.core.data.v2.common.Pair;

import com.google.gwt.user.client.ui.PopupPanel;
import com.google.gwt.user.client.ui.UIObject;

public class CalloutPopup extends PopupPanel {

    private static final int MARGIN_FROM_TARGET_PX = 10;
    private static final int ARROW_OFFSET_PX = 16;

    public enum CalloutPosition {
        BOTTOM_RIGHT, TOP_RIGHT;
    }

    public CalloutPopup() {
        super(true, true);
        init();
    }

    public CalloutPopup(boolean autoHide, boolean modal) {
        super(autoHide, modal);
        init();
    }

    public CalloutPopup(boolean autoHide) {
        super(autoHide);
        init();
    }

    private void init() {
        setStyleName("actions-popup");
    }

    public void showRelativeTo(final UIObject target, final CalloutPosition position) {
        addStyleDependentName(position.name().toLowerCase());

        setPopupPositionAndShow(new PositionCallback() {

            @Override
            public void setPosition(int offsetWidth, int offsetHeight) {
                showRelativeTo(target, position, offsetWidth, offsetHeight);
            }
        });
    }

    private void showRelativeTo(UIObject target, CalloutPosition position, int offsetWidth, int offsetHeight) {
        Pair<Integer, Integer> positionPair = Pair.of(0, 0);
        if (CalloutPosition.BOTTOM_RIGHT.equals(position)) {
            positionPair = getBottomRight(target, offsetWidth, offsetHeight);
        } else if (CalloutPosition.TOP_RIGHT.equals(position)) {
            positionPair = getTopRight(target, offsetWidth, offsetHeight);
        }

        setPopupPosition(positionPair.getFirst(), positionPair.getSecond());
    }

    private Pair<Integer, Integer> getBottomRight(UIObject target, int offsetWidth, int offsetHeight) {
        int left = target.getAbsoluteLeft() + target.getOffsetWidth() / 2 - offsetWidth + ARROW_OFFSET_PX;
        int top = target.getAbsoluteTop() - offsetHeight - MARGIN_FROM_TARGET_PX;

        // change top value if popup top disappears of the page (goes to bottom)
        if (top < 0) {
            top = target.getAbsoluteTop() + target.getOffsetHeight() + MARGIN_FROM_TARGET_PX;
            addStyleDependentName(CalloutPosition.TOP_RIGHT.name().toLowerCase());
        } else {
            addStyleDependentName(CalloutPosition.BOTTOM_RIGHT.name().toLowerCase());
        }

        return Pair.of(left, top);
    }

    private Pair<Integer, Integer> getTopRight(UIObject target, int offsetWidth, int offsetHeight) {
        int left = target.getAbsoluteLeft() + target.getOffsetWidth() / 2 - offsetWidth + ARROW_OFFSET_PX;
        int top = target.getAbsoluteTop() + target.getOffsetHeight() + MARGIN_FROM_TARGET_PX;
        addStyleDependentName(CalloutPosition.TOP_RIGHT.name().toLowerCase());
        return Pair.of(left, top);
    }
}