javascript - 如何在draw2d-js中创建连接时滚动我的画布？

Question

我有两个人物，一个在画布的可见区域，一个在外面（在右侧）。无法建立联系，因为我无法到达另一个数字。是否可以在创建连接时向右自动滚动，以便我可以连接到该图形？

Answer 1

不幸的是，您将不得不自己处理滚动。尝试这样的事情

var canvas = new draw2d.Canvas("canvas_id");
var scrollElement = canvas.getScrollArea();
var viewArea = new draw2d.geo.Rectangle(
                            scrollElement.scrollLeft(), scrollElement.scrollTop(),
                            scrollElement.width() * canvas.zoomFactor, scrollElement.height() * canvas.zoomFactor);

var outputLocator  = new draw2d.layout.locator.OutputPortLocator();
var port = figure.createPort("output", outputLocator);

port.on('drag', function(){

  if (!viewArea.contains(port.getBoundingBox())) {
    // -- the port has moved off the visible area of the canvas so scroll the view.   
  }
})

Answer 2

帆布政策：

var myScroll = draw2d.policy.canvas.CanvasPolicy.extend ({ NAME: 'myScroll',
                init: function() {
                this._super();
              },


onMouseMove: function(the, mouseX, mouseY, shiftKey, ctrlKey) {

        this._super(the, mouseX, mouseY, shiftKey, ctrlKey);

        if (mouseX>the.getWidth()-100+the.getScrollLeft()) { 

            $buffer = $("#canvas").scrollLeft();
            $treshold = 10;
            $("#canvas").scrollLeft($buffer+$treshold);


        }
}