gwt.material.design.client.base.mixin.TruncateMixin Maven / Gradle / Ivy

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/*
 * #%L
 * GwtMaterial
 * %%
 * Copyright (C) 2015 - 2022 GwtMaterialDesign
 * %%
 * 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.
 * #L%
 */
package gwt.material.design.client.base.mixin;

import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.ui.HasText;
import gwt.material.design.client.base.HasTruncate;
import gwt.material.design.client.base.MaterialWidget;
import gwt.material.design.client.constants.CssName;

public class TruncateMixin extends AbstractMixin implements HasTruncate {

    private ToggleStyleMixin toggleStyleMixin;
    private HandlerRegistration mouseOverHandler, mouseOutHandler;
    private boolean enableTruncateTitle = true;

    public TruncateMixin(T uiObject) {
        super(uiObject);
    }

    @Override
    public void setTruncate(boolean truncate) {
        getToggleStyleMixin().setOn(truncate);
        updateTitle();
    }

    protected void updateTitle() {
        if (uiObject instanceof HasText) {
            if (enableTruncateTitle) {
                Element element = uiObject.getElement();
                HasText hasText = (HasText) uiObject;
                element.setAttribute("title", "");
                if (mouseOutHandler == null) {
                    mouseOverHandler = uiObject.addMouseOverHandler(event -> {
                        if (!uiObject.getElement().hasAttribute("title")) return;
                        String text = hasText.getText();
                        boolean withEllipsis = element.getOffsetWidth() < element.getScrollWidth();
                        if (withEllipsis) {
                            element.setAttribute("title", text);
                        }
                    });
                }

                if (mouseOutHandler == null) {
                    mouseOutHandler = uiObject.addMouseOutHandler(event -> element.setAttribute("title", ""));
                }
            } else {
                if (mouseOverHandler != null) {
                    mouseOverHandler.removeHandler();
                }

                if (mouseOutHandler != null) {
                    mouseOutHandler.removeHandler();
                }
            }
        }
    }

    @Override
    public boolean isTruncate() {
        return getToggleStyleMixin().isOn();
    }

    @Override
    public void setEnableTruncateTitle(boolean value) {
        this.enableTruncateTitle = value;
    }

    @Override
    public boolean isEnableTruncateTitle() {
        return enableTruncateTitle;
    }

    public ToggleStyleMixin getToggleStyleMixin() {
        if (toggleStyleMixin == null) {
            toggleStyleMixin = new ToggleStyleMixin<>(uiObject, CssName.TRUNCATE);
        }
        return toggleStyleMixin;
    }
}