com.sencha.gxt.theme.base.client.slider.SliderHorizontalBaseAppearance.java Source code

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Here is the source code for com.sencha.gxt.theme.base.client.slider.SliderHorizontalBaseAppearance.java

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/**
 * Sencha GXT 4.0.0 - Sencha for GWT
 * Copyright (c) 2006-2015, Sencha Inc.
 *
 * licensing@sencha.com
 * http://www.sencha.com/products/gxt/license/
 *
 * ================================================================================
 * Open Source License
 * ================================================================================
 * This version of Sencha GXT is licensed under the terms of the Open Source GPL v3
 * license. You may use this license only if you are prepared to distribute and
 * share the source code of your application under the GPL v3 license:
 * http://www.gnu.org/licenses/gpl.html
 *
 * If you are NOT prepared to distribute and share the source code of your
 * application under the GPL v3 license, other commercial and oem licenses
 * are available for an alternate download of Sencha GXT.
 *
 * Please see the Sencha GXT Licensing page at:
 * http://www.sencha.com/products/gxt/license/
 *
 * For clarification or additional options, please contact:
 * licensing@sencha.com
 * ================================================================================
 *
 *
 * ================================================================================
 * Disclaimer
 * ================================================================================
 * THIS SOFTWARE IS DISTRIBUTED "AS-IS" WITHOUT ANY WARRANTIES, CONDITIONS AND
 * REPRESENTATIONS WHETHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE
 * IMPLIED WARRANTIES AND CONDITIONS OF MERCHANTABILITY, MERCHANTABLE QUALITY,
 * FITNESS FOR A PARTICULAR PURPOSE, DURABILITY, NON-INFRINGEMENT, PERFORMANCE AND
 * THOSE ARISING BY STATUTE OR FROM CUSTOM OR USAGE OF TRADE OR COURSE OF DEALING.
 * ================================================================================
 */
package com.sencha.gxt.theme.base.client.slider;

import com.google.gwt.cell.client.Cell.Context;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.safecss.shared.SafeStyles;
import com.google.gwt.safecss.shared.SafeStylesUtils;
import com.google.gwt.safehtml.shared.SafeHtml;
import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
import com.sencha.gxt.core.client.XTemplates;
import com.sencha.gxt.core.client.dom.XElement;
import com.sencha.gxt.core.client.util.Point;

public abstract class SliderHorizontalBaseAppearance extends SliderBaseAppearance {

    public interface SliderHorizontalResources extends SliderResources {

        @Override
        SliderHorizontalStyle style();

    }

    public interface SliderHorizontalStyle extends SliderStyle {
    }

    public interface SliderHorizontalTemplate extends XTemplates {

        @XTemplate(source = "SliderHorizontal.html")
        SafeHtml template(SliderStyle style, SafeStyles width, SafeStyles offset);

    }

    private final SliderHorizontalResources resources;
    private final SliderHorizontalTemplate template;

    public SliderHorizontalBaseAppearance(SliderHorizontalResources resources, SliderHorizontalTemplate template) {
        super(resources);
        this.resources = resources;
        this.template = template;
    }

    @Override
    public int getSliderLength(XElement parent) {
        return getInnerEl(parent).getOffsetWidth();
    }

    @Override
    public int getClickedValue(Context context, Element parent, Point location) {
        Element innerEl = getInnerEl(parent);
        return location.getX() - XElement.as(innerEl).getLeft(false);
    }

    @Override
    public void render(double fractionalValue, int width, int height, SafeHtmlBuilder sb) {
        if (width == -1) {
            // default
            width = 200;
        }

        // padding
        width -= getTrackPadding();

        SafeStyles offsetStyles = createThumbStyles(fractionalValue, width);
        SafeStyles widthStyle = SafeStylesUtils.fromTrustedString("width: " + width + "px;");
        sb.append(template.template(resources.style(), widthStyle, offsetStyles));
    }

    @Override
    public void setThumbPosition(Element parent, int pos) {
        XElement thumbElement = XElement.as(getThumb(parent));
        int halfThumbSize = getHalfThumbWidth();
        pos = Math.max(-halfThumbSize, pos);
        thumbElement.getStyle().setLeft(pos, Unit.PX);
    }

    @Override
    protected Element getEndEl(Element parent) {
        return parent.getFirstChildElement().getFirstChildElement();
    }

    @Override
    protected Element getInnerEl(Element parent) {
        return parent.getFirstChildElement().getFirstChildElement().getFirstChildElement();
    }

    @Override
    public boolean isVertical() {
        return false;
    }

    protected SafeStyles createThumbStyles(double fractionalValue, int width) {
        int halfThumbWidth = getHalfThumbWidth();
        int maxTrackLength = width - getHalfThumbWidth();
        int offset = (int) (fractionalValue * maxTrackLength) - halfThumbWidth;
        offset = Math.max(-halfThumbWidth, offset);
        offset = Math.min(maxTrackLength + halfThumbWidth, offset);

        SafeStyles offsetStyles = SafeStylesUtils.fromTrustedString("left:" + offset + "px;");
        return offsetStyles;
    }

    protected int getHalfThumbWidth() {
        return 7;
    }

    protected int getTrackPadding() {
        return 7;
    }

}