缩放div上可拖动元素的精确下降

Question

问题

我在将元素拖到可伸缩的div容器上时遇到了一个小问题.

一旦元素实际上在容器中,元素就会拖动并按照预期的方式工作.

拖动到可伸缩容器上的较大元素没有太多问题.

但是当拖动较小的元素时,您可以看到鼠标不再附加到所述元素上,当它被丢弃时,它会在它应该下降的地方稍微下降.

我正在尝试找到一个解决方案,我的鼠标停留在元素上,它会掉落到应该放下的位置.

我已经一点一点地解决了问题,你可以在下面看到,但这是让我疯狂的最后一块拼图.如果有人伸出援助之手的时候,这将是极大的赞赏.

这是一个codepen - 单击并将两个蓝色元素拖到白色容器上以试用它

Codepen

全屏视图

行动中的短GIF

---

这将有助于确保可放置区域与缩放容器一起使用.

$.ui.ddmanager.prepareOffsets = function(t, event) {
  var i, j, m = $.ui.ddmanager.droppables[t.options.scope] || [],
    type = event ? event.type : null,
    list = (t.currentItem || t.element).find(":data(ui-droppable)").addBack();
  droppablesLoop: for (i = 0; i < m.length; i++) {
    if (m[i].options.disabled || (t && !m[i].accept.call(m[i].element[0], (t.currentItem || t.element)))) {
      continue;
    }
    for (j = 0; j < list.length; j++) {
      if (list[j] === m[i].element[0]) {
        m[i].proportions().height = 0;
        continue droppablesLoop;
      }
    }
    m[i].visible = m[i].element.css("display") !== "none";
    if (!m[i].visible) {
      continue;
    }
    if (type === "mousedown") {
      m[i]._activate.call(m[i], event);
    }
    m[i].offset = m[i].element.offset();
    m[i].proportions({
      width: m[i].element[0].offsetWidth * percent,
      height: m[i].element[0].offsetHeight * percent
    });
  }
};

使元素可以在缩放容器上调整大小

function resizeFix(event, ui) {
  var changeWidth = ui.size.width - ui.originalSize.width,
    newWidth = ui.originalSize.width + changeWidth / percent,
    changeHeight = ui.size.height - ui.originalSize.height,
    newHeight = ui.originalSize.height + changeHeight / percent;
  ui.size.width = newWidth;
  ui.size.height = newHeight;
}

使它在拖放的缩放容器上工作

function dragFix(event, ui) { 
    var containmentArea = $("#documentPage_"+ui.helper.parent().parent().attr('id').replace(/^(\w+)_/, "")),
        contWidth = containmentArea.width(), contHeight = containmentArea.height();
    ui.position.left = Math.max(0, Math.min(ui.position.left / percent , contWidth - ui.helper.width()));
    ui.position.top = Math.max(0, Math.min(ui.position.top  / percent,  contHeight- ui.helper.height()));
}

创建一个可以拖动到框中的可拖动元素.

.directive('draggableTypes', function() {
  return {
    restrict:'A',
    link: function(scope, element, attrs) {
      element.draggable({
        zIndex:3000, 
        appendTo: 'body', 
        helper: function(e, ui){ 
          var formBox = angular.element($("#formBox"));
          percent = formBox.width() / scope.templateData.pdf_width;
          if(element.attr('id') == 'textbox_item')
              return $('<div class="text" style="text-align:left;font-size:14px;width:200px;height:20px;line-height:20px;">New Text Box.</div>').css({ 'transform': 'scale(' + percent + ')', '-moz-transform': 'scale(' + percent + ')', '-webkit-transform': 'scale(' + percent + ')', '-ms-transform': 'scale(' + percent + ')'});
          if(element.attr('id') == 'sm_textbox_item')
              return $('<div class="text" style="text-align:left;font-size:14px;width:5px;height:5px;line-height:20px;"></div>').css({ 'transform': 'scale(' + percent + ')', '-moz-transform': 'scale(' + percent + ')', '-webkit-transform': 'scale(' + percent + ')', '-ms-transform': 'scale(' + percent + ')'});
          }
      });
    }
  };
})

创建可能已在框中的可拖动/可调整大小的元素,并将拖动/调整大小修复应用于这些元素

.directive('textboxDraggable', function() {
  return {
    restrict:'A',
    link: function(scope, element, attrs) {

        element.draggable({ 
            cursor: "move",
            drag: dragFix,
            start: function(event, ui) {
                var activeId = element.attr('id');
                scope.activeElement.id = activeId;
                scope.activeElement.name = scope.templateItems[activeId].info.name;
                scope.$apply();
            }
        });

        element.resizable({
            minWidth: 25,
            minHeight: 25,
            resize: resizeFix,
            stop: function( event, ui ) {

                var activeId = element.attr('id');

                scope.activeElement.duplicateName = false;
                scope.activeElement.id = activeId;
                scope.activeElement.name = scope.templateItems[activeId].info.name;

                scope.templateItems[activeId]['style']['width'] = element.css('width');
                scope.templateItems[activeId]['style']['height'] = element.css('height');

                scope.$apply();
            }
        })

    }
  };
})

删除项目时会发生什么

.directive('droppable', function($compile) {
  return {
    restrict: 'A',
    link: function(scope,element,attrs){
        element.droppable({
            drop:function(event,ui) {
                 var draggable = angular.element(ui.draggable),
                    draggable_parent = draggable.parent().parent(),
                    drag_type = draggable.attr('id'),
                    documentBg = element,
                    x = ui.offset.left,
                    y = ui.offset.top,
                    element_top = (y - documentBg.offset().top - draggable.height() * (percent - 1) / 2) / percent,
                    element_left = (x - documentBg.offset().left - draggable.width() * (percent - 1) / 2) / percent,
                    timestamp = new Date().getTime();

                    //just get the document page of where the mouse is if its a new element
                    if(draggable_parent.attr('id') == 'template_builder_box_container' || draggable_parent.attr('id') == 'template_builder_container')
                        var documentPage = documentBg.parent().parent().attr('id').replace(/^(\w+)_/, "");
                    //if you are dragging an element that was already on the page, get parent of draggable and not parent of where mouse is
                    else var documentPage = draggable_parent.parent().parent().attr('id').replace(/^(\w+)_/, "");

                    if(drag_type == "textbox_item")
                    {
                        scope.activeElement.id = scope.templateItems.push({
                            info: {'page': documentPage,'name': 'textbox_'+timestamp, 'type': 'text'},
                            style: {'text-align':'left','font-size':'14px','top':element_top+'px','left':element_left+'px', 'width':'200px', 'height':'20px'}
                        }) - 1;

                        scope.activeElement.name = 'textbox_'+timestamp;
                    }
                    else if(drag_type == "sm_textbox_item")
                    {
                        scope.activeElement.id = scope.templateItems.push({
                            info: {'page': documentPage,'name': '', 'type': 'text'},
                            style: {'text-align':'left','font-size':'14px','top':element_top+'px','left':element_left+'px', 'width':'5px', 'height':'5px'}
                        }) - 1;

                        scope.activeElement.name = 'textbox_'+timestamp;
                    }
                    else {
                        scope.templateItems[scope.activeElement.id]['style']['top'] = draggable.css('top');
                        scope.templateItems[scope.activeElement.id]['style']['left'] = draggable.css('left');
                    }

                scope.$apply();
            }
        });
    }
  };
})

最后但同样重要的是,我的控制器

.controller('testing', function($scope, $rootScope, $state, $stateParams) {
  $scope.templateItems = [];
  $scope.activeElement = { id: undefined, name: undefined };
  $scope.templateData = {"id":"12345", "max_pages":1,"pdf_width":385,"pdf_height":800};
  $scope.clickElement = function(index)   { $scope.activeElement = { id: index, name: $scope.templateItems[index].info.name } }

});

这是我的HTML的基础

<div id="formBox" ng-style="formbox(templateData.pdf_width)" zoom>
    <div class="trimSpace" ng-style="trimSpace(templateData.pdf_width)" zoom>
        <div id="formScale" ng-style="formScale(templateData.pdf_width)" zoom>
            <form action="#" id="{{ templateData.id }}_form">
                <div ng-repeat="key in [] | range:templateData.max_pages">              
                    <div class="formContainer" id="{{ templateData.id + '_' + (key+1) }}" ng-style="{width: templateData.pdf_width+'px', height: templateData.pdf_height+'px'}">
                        <div class="formContent">
                            <div class="formBackground" id="documentPage_{{ (key+1) }}" droppable>
                                <div ng-hide="preview" ng-repeat="item in templateItems">
                                    <div ng-if="item.info.page == (key+1) && item.info.type == 'text'" id="{{ $index }}" data-type="{{ item.info.type }}" ng-click="clickElement($index)" class="text" ng-style="item.style" textbox-draggable>{{ item.info.name }}</div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>          
            </form>
        </div>
    </div>
</div>

Answer 1

对于拖动时的光标位置,请参阅以下答案:在jquery-ui draggable方法中将光标位置设置为ui.helper的中心位置

基本上,您可以控制实例的光标位置,从而允许使用更多动态的cursorAt.像这样:

start: function(event, ui){
    $(this).draggable('instance').offset.click = {
        left: Math.floor(ui.helper.width() / 2),
        top: Math.floor(ui.helper.height() / 2)
    }
},

然后在drop上,你需要考虑变换,但你可以通过使用辅助坐标而不是draggable来简化.像这样:

element_top = (ui.helper.offset().top / percent) - (documentBg.offset().top / percent);
element_left = (ui.helper.offset().left / percent) - (documentBg.offset().left / percent);

结果:https://codepen.io/anon/pen/jamLBq