org.kaaproject.kaa.sandbox.web.client.mvp.view.widget.LeftPanelWidget.java Source code

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Here is the source code for org.kaaproject.kaa.sandbox.web.client.mvp.view.widget.LeftPanelWidget.java

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/**
 *  Copyright 2014-2016 CyberVision, Inc.
 *
 *  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 org.kaaproject.kaa.sandbox.web.client.mvp.view.widget;

import org.kaaproject.kaa.sandbox.web.client.util.ResizeSupport;
import org.kaaproject.kaa.sandbox.web.client.util.ResizeSupport.OnResizeListener;
import org.kaaproject.kaa.sandbox.web.client.util.Utils;

import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.Anchor;
import com.google.gwt.user.client.ui.DockLayoutPanel;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.HasVerticalAlignment;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.ScrollPanel;
import com.google.gwt.user.client.ui.Widget;

public class LeftPanelWidget extends DockLayoutPanel {

    private boolean isOpen = true;

    private ScrollPanel contentScroll;
    private Label titleLabel;
    private Anchor anchor;

    protected boolean isActive = true;

    private HandlerRegistration resizeHandler;

    public LeftPanelWidget(Unit unit) {
        super(unit);
        addStyleName(Utils.sandboxStyle.leftPanel());
        HorizontalPanel titlePanel = new HorizontalPanel();
        titlePanel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE);
        titlePanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_LEFT);
        titleLabel = new Label();
        titleLabel.addStyleName(Utils.sandboxStyle.title());
        titlePanel.add(titleLabel);
        titlePanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_RIGHT);
        anchor = new Anchor();
        anchor.addStyleName(Utils.sandboxStyle.toggle());
        titlePanel.add(anchor);
        titlePanel.setSize("100%", "100%");
        addNorth(titlePanel, 40);

        contentScroll = new ScrollPanel() {
            @Override
            public void onResize() {
                super.onResize();
                int scrollHeight = this.getScrollableElement().getClientHeight();
                int elementHeight = this.getContainerElement().getClientHeight();
                boolean isScroll = elementHeight > scrollHeight;
                if (isScroll && !(LeftPanelWidget.this.isOpen && LeftPanelWidget.this.isActive)) {
                    LeftPanelWidget.this.addStyleName(Utils.sandboxStyle.isScroll());
                } else {
                    LeftPanelWidget.this.removeStyleName(Utils.sandboxStyle.isScroll());
                }
            }
        };
        contentScroll.setHeight("100%");
        add(contentScroll);

        addStyleName(Utils.sandboxStyle.isOpen());

        anchor.addClickHandler(new ClickHandler() {
            @Override
            public void onClick(ClickEvent event) {
                if (isActive) {
                    setOpen(!isOpen, false);
                }
            }
        });
    }

    public void setActive(boolean isActive) {
        if (this.isActive != isActive) {
            this.isActive = isActive;
            if (!isActive) {
                setOpen(false, true);
                addStyleName(Utils.sandboxStyle.isInactive());
            } else {
                setOpen(this.isOpen, true);
                removeStyleName(Utils.sandboxStyle.isInactive());
            }
        }
    }

    private void setOpen(boolean isOpen, boolean force) {
        if (this.isOpen != isOpen || force) {
            if (!force) {
                this.isOpen = isOpen;
            }
            if (isOpen) {
                addStyleName(Utils.sandboxStyle.isOpen());
                removeStyleName(Utils.sandboxStyle.isScroll());
                if (resizeHandler != null) {
                    resizeHandler.removeHandler();
                    resizeHandler = null;
                }
            } else {
                removeStyleName(Utils.sandboxStyle.isOpen());
                contentScroll.onResize();
                if (resizeHandler == null) {
                    resizeHandler = ResizeSupport.addOnResizeListener(contentScroll.getElement(),
                            new OnResizeListener() {

                                @Override
                                public void onResize(Element e) {
                                    contentScroll.onResize();

                                }
                            });
                }
            }
        }
    }

    public void setHeadTitle(String title) {
        titleLabel.setText(title);
    }

    public void setContent(Widget widget) {
        contentScroll.setWidget(widget);
    }

}