jetbrains.jetpad.cell.toDom.PopupPositioner.java Source code

Introduction

Here is the source code for jetbrains.jetpad.cell.toDom.PopupPositioner.java

Source

/*
 * Copyright 2012-2016 JetBrains s.r.o
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package jetbrains.jetpad.cell.toDom;

import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Style;
import com.google.gwt.user.client.Window;
import jetbrains.jetpad.cell.mappersUtil.PopupPositionUpdater;
import jetbrains.jetpad.geometry.Rectangle;
import jetbrains.jetpad.geometry.Vector;
import jetbrains.jetpad.projectional.domUtil.DomUtil;

class PopupPositioner extends PopupPositionUpdater<Element> {
    private CellToDomContext myContext;

    PopupPositioner(CellToDomContext context) {
        myContext = context;
    }

    @Override
    protected void updateBottom(Rectangle target, Element popup, boolean hasTop) {
        if (hasTop) {
            positionBottom(popup, target);
            return;
        }
        Rectangle visiblePart = getVisiblePart();
        Rectangle popupBounds = new Rectangle(target.origin,
                new Vector(popup.getClientWidth(), Tooltip.height(popup)));
        boolean bottom = visiblePart.contains(popupBounds.add(new Vector(0, target.dimension.y)));
        boolean top = visiblePart.contains(popupBounds.sub(new Vector(0, popupBounds.dimension.y)));
        if (bottom || !top) {
            positionBottom(popup, target);
        } else {
            positionTop(popup, target, popupBounds);
        }
    }

    @Override
    protected void updateTop(Rectangle target, Element popup, boolean hasBottom) {
        Rectangle popupBounds = new Rectangle(target.origin,
                new Vector(popup.getClientWidth(), Tooltip.height(popup)));
        if (hasBottom) {
            positionTop(popup, target, popupBounds);
            return;
        }
        Rectangle visiblePart = getVisiblePart();
        boolean top = visiblePart.contains(popupBounds.sub(new Vector(0, popupBounds.dimension.y)));
        boolean bottom = visiblePart.contains(popupBounds.add(new Vector(0, target.dimension.y)));
        if (top || !bottom) {
            positionTop(popup, target, popupBounds);
        } else {
            positionBottom(popup, target);
        }
    }

    private void positionTop(Element popup, Rectangle target, Rectangle popupBounds) {
        Tooltip.top(popup);
        setPosition(popup, target.origin.x, target.origin.y - popupBounds.dimension.y);
    }

    private void positionBottom(Element popup, Rectangle target) {
        Tooltip.bottom(popup);
        setPosition(popup, target.origin.x, target.origin.y + target.dimension.y);
    }

    private Rectangle getVisiblePart() {
        if (DomUtil.hasScrollers(myContext.rootElement)) {
            return DomUtil.visiblePart(myContext.rootElement);
        } else {
            return new Rectangle(Window.getScrollLeft(), Window.getScrollTop(), Window.getClientWidth(),
                    Window.getClientHeight());
        }
    }

    @Override
    protected void updateFront(Rectangle target, Element popup) {
        setPosition(popup, target.origin.x, target.origin.y);
    }

    @Override
    protected void updateLeft(Rectangle target, Element popup) {
        setPosition(popup, target.origin.x - popup.getClientWidth(), target.origin.y);
    }

    @Override
    protected void updateRight(Rectangle target, Element popup) {
        setPosition(popup, target.origin.x + target.dimension.x, target.origin.y);
    }

    private void setPosition(Element child, int left, int top) {
        Style style = child.getStyle();
        style.setLeft(left - myContext.rootElement.getAbsoluteLeft(), Style.Unit.PX);
        style.setTop(top - myContext.rootElement.getAbsoluteTop(), Style.Unit.PX);
    }
}