问题
我在可缩放的 div 容器中拖拽元素时遇到了一些小问题。
一旦元素实际进入容器，元素就可以正常拖动并按照预期工作。
被拖到可缩放容器上的较大元素没有太大问题。
但是当拖动较小的元素时，你会发现鼠标不再与该元素相连，释放时也会偏离应该落下的位置。
我正在尝试找到一个解决方案，让我的鼠标停留在元素上，并将元素放置在应该放置的位置。
我已经逐步解决了问题，你可以在下面看到，但这是让我发疯的最后一块拼图。如果有人有时间帮忙，那将非常感激。
这里是一个 Codepen - 点击并将两个蓝色元素拖到白色容器中以进行尝试
Codepen
全屏查看
短 GIF 演示
这将有助于确保可缩放容器中的可放置区域正常工作。
$.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
});
}
};
使元素在缩放容器上可调整大小
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;
}
使拖动在缩放容器上正常工作
function dragFix(event, ui) {
var containmentArea = $("#documentPage_"+ui.helper.parent().parent().attr('id').replace(/^(\w+)_/, "")),
contWidth = containmentArea.width(), contHeight = containmentArea.height();
ui.position.left = Math.max(0, Math.min(ui.position.left / percent , contWidth - ui.helper.width()));
ui.position.top = Math.max(0, Math.min(ui.position.top / percent, contHeight- ui.helper.height()));
}
创建可拖动的元素，我可以将其拖动到框中。
.directive('draggableTypes', function() {
return {
restrict:'A',
link: function(scope, element, attrs) {
element.draggable({
zIndex:3000,
appendTo: 'body',
helper: function(e, ui){
var formBox = angular.element($("#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 $('<div class="text" style="text-align:left;font-size:14px;width:5px;height:5px;line-height:20px;"></div>').css({ 'transform': 'scale(' + percent + ')', '-moz-transform': 'scale(' + percent + ')', '-webkit-transform': 'scale(' + percent + ')', '-ms-transform': 'scale(' + percent + ')'});
}
});
}
};
})
创建可拖动/可调整大小的元素，这些元素可能已经在框中，并对它们应用拖动/调整大小修复。
.directive('textboxDraggable', function() {
return {
restrict:'A',
link: function(scope, element, attrs) {
element.draggable({
cursor: "move",
drag: dragFix,
start: function(event, ui) {
var activeId = element.attr('id');
scope.activeElement.id = activeId;
scope.activeElement.name = scope.templateItems[activeId].info.name;
scope.$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.$apply();
}
})
}
};
})
当一个物品被丢弃时会发生什么？
.directive('droppable', function($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.$apply();
}
});
}
};
})
最后但并非最不重要的，我的控制器。
.controller('testing', function($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基础代码：
这里是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>