Source Code : Click and drag to pan the image inside its frame. (Smart GWT)

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Click and drag to pan the image inside its frame. (Smart GWT)

   
/*
 * SmartGWT (GWT for SmartClient)
 * Copyright 2008 and beyond, Isomorphic Software, Inc.
 *
 * SmartGWT is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version 3
 * as published by the Free Software Foundation.  SmartGWT is also
 * available under typical commercial license terms - see
 * http://smartclient.com/license
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 */
package com.smartgwt.sample.showcase.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.RootPanel;
import com.smartgwt.client.types.Cursor;
import com.smartgwt.client.types.DragAppearance;
import com.smartgwt.client.types.ImageStyle;
import com.smartgwt.client.types.Overflow;
import com.smartgwt.client.util.EventHandler;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.Img;
import com.smartgwt.client.widgets.events.DragMoveEvent;
import com.smartgwt.client.widgets.events.DragMoveHandler;
import com.smartgwt.client.widgets.events.DragStartEvent;
import com.smartgwt.client.widgets.events.DragStartHandler;

public class Showcase implements EntryPoint {

  public void onModuleLoad() {
    RootPanel.get().add(getViewPanel());
  }

  public Canvas getViewPanel() {
    Canvas canvas = new Canvas();
    canvas.addChild(new DragPanSampleImg());
    return canvas;
  }

}

class DragPanSampleImg extends Img {
  private int startScrollLeft;

  private int startScrollTop;

  public DragPanSampleImg() {
    super("other/cpu.jpg", 200, 200);

    setLeft(50);
    setTop(50);
    setOverflow(Overflow.HIDDEN);
    setShowEdges(true);
    setPadding(20);
    setImageType(ImageStyle.NORMAL);
    setCanDrag(true);
    setCursor(Cursor.ALL_SCROLL);
    setDragAppearance(DragAppearance.NONE);
    addDragStartHandler(new DragStartHandler() {
      public void onDragStart(DragStartEvent event) {
        startScrollLeft = getScrollLeft();
        startScrollTop = getScrollTop();
      }
    });
    addDragMoveHandler(new DragMoveHandler() {
      public void onDragMove(DragMoveEvent event) {
        int left = startScrollLeft - EventHandler.getX() + EventHandler.getMouseDownX();
        int top = startScrollTop - EventHandler.getY() + EventHandler.getMouseDownY();
        scrollTo(left, top);
      }
    });
  }
}

   
    
    
  

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