VDF常见问题整理（六十四）：如何删除特定图层的所有实体

VectorDraw Developer Framework

问：如何删除Layer1的所有实体/span>

答：在下面的示例中，我们从所有布局和块中删除所有引用Layer1的实体，因此，如果一个块包含来自多个图层的实体，则将删除引用第1层的实体。

 //returns the handle of the layer of the passed entity       function GetEntityLayerHandle(vdrawobj, document, entity) {           var ret = entity.Layer;           if (!ret) {//if not exist asume that it belongs to Layer '0'               ret = vdrawobj.FindLayer("0");               if (!ret) ret = 'h_';               else ret = "h_" + ret.HandleId.toString();           }           return ret;       }       //set the Deleted property of the entities that belongs to layer with passed layerHandle, to true       //Note: Entities with Deleted == true are not draw and they are not saved       function deleteEntitiesOnLayer(vdrawobj,document, handlecollection, layerHandle) {           for (var i = 0; i < handlecollection.Items.length; i++) {               var ent = vdrawobj.GetDictItem(handlecollection, handlecollection.Items[i]);               if (!ent) continue;               var layerentity = GetEntityLayerHandle(vdrawobj,document,ent);               if (layerentity == layerHandle)                   ent.Deleted = true;           }          }       function test() {           //Mark all the entities, of all layouts and all blocks, that have property Layer == Layer 1 handle as Deleted = true           var layer1 = vdcanvas.FindLayer('Layer1');           var layerHandle = "h_" + layer1.HandleId.toString();           var vddoc = vdcanvas.GetDocument();           deleteEntitiesOnLayer(vdcanvas, vddoc, vddoc.Model.Entities, layerHandle);           if (vddoc.LayOuts) {               for (var i = 0; i < vddoc.LayOuts.Items.length; i++) {                   deleteEntitiesOnLayer(vdcanvas, vddoc, vddoc.LayOuts.Items[i].Entities, layerHandle);               }           }           if (vddoc.Blocks) {               for (var i = 0; i < vddoc.Blocks.Items.length; i++) {                   var block = vdcanvas.GetDictItem(vddoc.Blocks, vddoc.Blocks.Items[i]);                   if (!block) continue;                   deleteEntitiesOnLayer(vdcanvas, vddoc, block.Entities, layerHandle);               }           }           vdcanvas.UpdateLayout();           setTimeout(vdcanvas.redraw);       }

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