design/designer-form/src/main/java/com/fr/design/mainframe/FormAreaMouseWheelHandler.java

package com.fr.design.mainframe;

import com.fr.common.inputevent.InputEventBaseOnOS;

import javax.swing.JScrollBar;
import javax.swing.JViewport;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;

/**
 * @author Starryi
 * @version 1.0
 * Created by Starryi on 2021/9/24
 */
public class FormAreaMouseWheelHandler implements MouseWheelListener {
    private final DesignerTranslateMouseWheelHandler translateMouseWheelHandler;
    private final DesignerScaleMouseWheelHandler scaleMouseWheelHandler;

    public FormAreaMouseWheelHandler(FormArea formArea) {
        translateMouseWheelHandler = new DesignerTranslateMouseWheelHandler(new FormAreaScrollPaneAdapter(formArea));
        scaleMouseWheelHandler = new DesignerScaleMouseWheelHandler(new FormAreaScalePaneAdapter(formArea), FormArea.SHOWVALMIN);
    }

    @Override
    public void mouseWheelMoved(MouseWheelEvent e) {
        if (InputEventBaseOnOS.isControlDown(e)) {
            scaleMouseWheelHandler.mouseWheelMoved(e);
        } else {
            translateMouseWheelHandler.mouseWheelMoved(e);
        }
    }

    private static class FormAreaScalePaneAdapter implements DesignerScaleMouseWheelHandler.ScalePane {
        private final FormArea formArea;

        public FormAreaScalePaneAdapter(FormArea formArea) {
            this.formArea = formArea;
        }

        @Override
        public JFormSliderPane getSlidePane() {
            return formArea.getSlidePane();
        }
    }

    private static class FormAreaScrollPaneAdapter implements DesignerTranslateMouseWheelHandler.ScrollPane {
        private final FormArea formArea;
        private final JViewport viewport;

        public FormAreaScrollPaneAdapter(FormArea formArea) {
            this.formArea = formArea;
            this.viewport = new JViewport();
        }

        @Override
        public boolean isWheelScrollingEnabled() {
            return true;
        }

        @Override
        public JScrollBar getVerticalScrollBar() {
            return formArea.getVerticalScrollBar();
        }

        @Override
        public JScrollBar getHorizontalScrollBar() {
            return formArea.getHorizontalScrollBar();
        }

        @Override
        public JViewport getViewport() {
            return this.viewport;
        }
    }
}