AbstractLienzoPalette.java

/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * 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.kie.workbench.common.stunner.client.lienzo.components.palette;

import org.kie.workbench.common.stunner.client.lienzo.components.palette.view.LienzoPaletteView;
import org.kie.workbench.common.stunner.core.client.api.ShapeManager;
import org.kie.workbench.common.stunner.core.client.components.palette.AbstractPalette;
import org.kie.workbench.common.stunner.core.client.components.palette.model.HasPaletteItems;
import org.kie.workbench.common.stunner.core.client.components.palette.view.PaletteGrid;
import org.kie.workbench.common.stunner.core.client.components.palette.view.PaletteGridLayoutBuilder;

public abstract class AbstractLienzoPalette<D extends HasPaletteItems, V extends LienzoPaletteView> extends AbstractPalette<D>
        implements LienzoPalette<D, V> {

    protected boolean expanded;
    protected int iconSize;
    protected int padding;
    protected Layout layout;
    protected V view;
    protected boolean isExpandable;

    protected AbstractLienzoPalette() {
        this(null,
             null);
    }

    public AbstractLienzoPalette(final ShapeManager shapeManager,
                                 final V view) {
        super(shapeManager);
        this.view = view;
        this.expanded = false;
        this.iconSize = 50;
        this.padding = 10;
        this.isExpandable = true;
        this.layout = Layout.VERTICAL;
    }

    protected abstract void doBind();

    protected abstract void doExpandCollapse();

    public abstract double[] computePaletteSize();

    protected void doInit() {
        view.setPresenter(this);
    }

    @Override
    @SuppressWarnings("unchecked")
    public AbstractLienzoPalette bind() {
        view.clear();
        beforeBind();
        doBind();
        afterBind();
        view.draw();
        return this;
    }

    protected void beforeBind() {
    }

    protected void afterBind() {
    }

    @Override
    public LienzoPalette<D, V> setExpandable(final boolean canExpand) {
        this.isExpandable = canExpand;
        return this;
    }

    public boolean isExpandable() {
        return isExpandable;
    }

    @Override
    public void setLayout(final Layout layout) {
        this.layout = layout;
    }

    @Override
    public LienzoPalette<D, V> setIconSize(final int iconSize) {
        this.iconSize = iconSize;
        return this;
    }

    @Override
    public LienzoPalette<D, V> setPadding(final int padding) {
        this.padding = padding;
        return this;
    }

    @Override
    public LienzoPalette<D, V> expand() {
        if (!isExpandable) {
            throw new IllegalStateException("Palette is not expandable");
        }
        this.expanded = true;
        doExpandCollapse();
        return this;
    }

    @Override
    public LienzoPalette<D, V> collapse() {
        if (!isExpandable) {
            throw new IllegalStateException("Palette is not expandable");
        }
        this.expanded = false;
        doExpandCollapse();
        return this;
    }

    @Override
    protected void doDestroy() {
        getView().destroy();
    }

    public PaletteGrid getGrid() {
        final PaletteGridLayoutBuilder gridLayoutBuilder = isHorizontalLayout() ?
                PaletteGridLayoutBuilder.HORIZONTAL :
                PaletteGridLayoutBuilder.VERTICAL;
        gridLayoutBuilder.setIconSize(iconSize);
        gridLayoutBuilder.setPadding(padding);
        return gridLayoutBuilder.build();
    }

    public boolean isExpanded() {
        return expanded;
    }

    protected boolean isHorizontalLayout() {
        return layout.equals(Layout.HORIZONTAL);
    }

    @Override
    public V getView() {
        return view;
    }
}