Why CONTENT_TOUCHMOVE event dont call evt.preventDefault

[DMIAOCHEN]

Why CONTENT_TOUCHMOVE event dont call evt.preventDefault

[lavrton]

Do you have an example? A page will be scrolled if there are no dragging nodes on stage.

[DMIAOCHEN]

thanks, lavrton!
I have a more serious problem now, when in ipad, the safari will crash when i create lots of stage and layer, i don't konw why it's happend, can you help me? this is my create stage code. when i call three thimes 'createStandardLayout' , and the row and col is 2, the safari crashed!

var Konva = Konva || {};
(function () {
    Konva.Util.addMethods(EWorldWebViewer.Gui.LayoutCreator, {
        ___init: function (config) {
            this._id_container = 'center';
        },


        /*
        * 创建标准的布局格式
        * @param {Int} rows 行数
        * @param {Int} cols 列数
        * @param {Int} index 索引号
        * @return {EWorldWebViewer.Models.Layout}
        */
        createStandardLayout: function (rows, cols, index) {
            var layout = new EWorldWebViewer.Models.Layout();
            layout._rows = rows;
            layout._cols = cols
            layout._id = "layout_" + index;    // 设置ID

            // 选择ID
            while (true) {
                if ($("#" + layout._id).length > 0) {
                    // Id已经存在
                    //console.error("Id:" + layout._id + "已经存在");

                    index += 1;
                    layout._id = "layout_" + index;    // 设置ID
                } else {
                    break;
                }
            }



            // 计算整个Layout的高度和宽度
            var layHeight = $("#" + this._id_container).height();
            var layWidth = $("#" + this._id_container).width();

            $("<div>", {
                'id': layout._id,
                'class': 'layout-container',
                'css': {
                    'height': layHeight,
                    'width': layWidth,
                    'position': 'absolute',
                    'background-color': '#666',
                    'left': 0,
                    'top': 1,
                    'z-index': index
                }
            }).appendTo("#" + this._id_container);

            // 创建Viewers
            this.createViewers(layout);

            return layout;
        },

        /*
        * 创建影像显示窗口
        * @param {EWorldWebViewer.Models.Layout} layout
        */
        createViewers: function(layout){
            // 清空
            layout.clearViewer();

            // 计算每个View的尺寸
            var layHeight = $('#' + layout._id).height();
            var layWidth = $('#' + layout._id).width();

            // 横向边框数目
            var border_count_h = layout._cols  + 1;

            // 纵向边框数目
            var border_count_v = layout._rows + 1;

            var vHeight = parseInt((layHeight - border_count_v) / layout._rows);
            var vWidth = parseInt((layWidth - border_count_h) / layout._cols);

            for (var r = 0; r < layout._rows; ++r) {
                for (var c = 0; c < layout._cols; ++c) {
                    var viewer = new EWorldWebViewer.Models.Viewer();
                    viewer._id = layout._id + '_viewer_' + (r * layout._cols + c);
                    $("<div>", {
                        'id': viewer._id,
                        'class': 'subseries',
                        'css': {
                            'width': vWidth,
                            'height': vHeight,
                            'position': 'absolute',
                            'left': (vWidth) * c + (c + 1),
                            'top': (vHeight) * r + (r + 1),
                            'background': '#000'
                        }
                    }).appendTo('#' + layout._id);



                    viewer._viewerWidth = vWidth;
                    viewer._viewerHeight = vHeight;

                    // 创建舞台
                    viewer._stage = new Konva.Stage({
                        container: viewer._id,
                        id: viewer._id + "_stage",
                        width: vWidth - 2,
                        height: vHeight - 2
                    });

                    /*事件绑定*/
                    if (viewer._stage) {
                        if (Konva.UA.mobile) {
                            //viewer._stage.on("touchstart", eWorldWebApp._htmlGen._imageViewPage._eventHandle.event_handle_stage_touch_start());
                            viewer._stage.on("contentTouchstart", EWorldWebViewer.eWorldWebApp._htmlGen._imageViewPage._eventHandle.event_handle_stage_touch_start());
                            //viewer._stage.on("touchmove", eWorldWebApp._htmlGen._imageViewPage._eventHandle.event_handle_stage_mouse_move());
                            viewer._stage.on("contentTouchmove", EWorldWebViewer.eWorldWebApp._htmlGen._imageViewPage._eventHandle.event_handle_stage_mouse_move());
                            viewer._stage.on("contentDbltap", EWorldWebViewer.eWorldWebApp._htmlGen._imageViewPage._eventHandle.event_handle_stage_dbclick());
                            //viewer._stage.on("touchend", eWorldWebApp._htmlGen._imageViewPage._eventHandle.event_handle_stage_touch_end());
                            viewer._stage.on("contentTouchend", EWorldWebViewer.eWorldWebApp._htmlGen._imageViewPage._eventHandle.event_handle_stage_touch_end());
                        } else {
                            //viewer._stage.on("mousemove", eWorldWebApp._htmlGen._imageViewPage._eventHandle.event_handle_stage_mouse_move());
                            viewer._stage.on("contentMousemove", EWorldWebViewer.eWorldWebApp._htmlGen._imageViewPage._eventHandle.event_handle_stage_mouse_move());
                            viewer._stage.on("mousewheel", EWorldWebViewer.eWorldWebApp._htmlGen._imageViewPage._eventHandle.event_handle_stage_mouse_wheel());
                            viewer._stage.on("contentMousedown", EWorldWebViewer.eWorldWebApp._htmlGen._imageViewPage._eventHandle.event_handle_stage_mouse_down());
                            viewer._stage.on("contentMouseup", EWorldWebViewer.eWorldWebApp._htmlGen._imageViewPage._eventHandle.event_handle_stage_mouse_up());
                            viewer._stage.on("contentMouseover", EWorldWebViewer.eWorldWebApp._htmlGen._imageViewPage._eventHandle.event_handle_stage_mouse_over());
                            viewer._stage.on("contentMouseout", EWorldWebViewer.eWorldWebApp._htmlGen._imageViewPage._eventHandle.event_handle_stage_mouse_out());
                            viewer._stage.on("dblclick", EWorldWebViewer.eWorldWebApp._htmlGen._imageViewPage._eventHandle.event_handle_stage_dbclick());
                        }
                    }

                    // 创建绘图层
                    this.createCanvasLays(viewer);

                    layout._viewers.push(viewer);

                    // 创建选中块
                    $("<div>", {
                        'id': viewer._id + '_selector',
                        'class': 'viewer_selector',
                        'css': {
                            'width': '10px',
                            'height': '10px',
                            'position': 'absolute',
                            'background': '#ff0',
                            'right': 0,
                            'bottom': 0,
                            'display': 'none'
                        }
                    }).appendTo('#' + viewer._id);

                    // 添加滚动条
                    var sliderTop = vHeight - 30;
                    var sliderDivWidth = vWidth / 3;
                    var sliderLeft = (vWidth - sliderDivWidth) / 2;
                    var sliderWidth = sliderDivWidth - 56;
                    var sliderId = viewer._id + "_slider";
                    var htmlScroll =
                        '<div class="viewer_slider" id="' + sliderId + '" style="left: '+ sliderLeft +'px; top: ' + sliderTop + 'px; width: '+ sliderDivWidth +'px; height: 25px; position: absolute; background:#000; filter:alpha(Opacity=80);-moz-opacity:0.5;opacity: 0.5; display:none">' +
                            '<button class="button button-tiny button-inverse-flat button-circle" style="float:left">' +
                                '<i class="fa fa-angle-left"></i>' +
                            '</button>' +
                            '<div class="slider_d" style="width:' + sliderWidth + 'px;height:10px; margin: 10px 1px 0px 1px; position:relative;left:28px"></div>' +
                            '<button class="button button-tiny button-inverse-flat button-circle" style="float:right">' +
                                '<i class="fa fa-angle-right"></i>' +
                            '</button>' +
                        '</div>';

                    $("#" + viewer._id).append(htmlScroll);

                    // 创建加载进度
                    EWorldWebViewer.eWorldWebApp._htmlGen.genProgress(viewer);
                }
            }

            $('.slider_d').slider({
                max: 100,
                min: 0,
                step: 1
            });
        },

        /* 
        * 创建绘图层
        */
        createCanvasLays: function (viewer) {
            viewer._layer_image = new Konva.Layer();
            viewer._stage.add(viewer._layer_image);

            viewer._layer_annon = new Konva.Layer();
            viewer._stage.add(viewer._layer_annon);

            viewer._layer_annon_temp = new Konva.Layer();
            viewer._stage.add(viewer._layer_annon_temp);

            viewer._layer_anchor = new Konva.Layer();
            viewer._stage.add(viewer._layer_anchor);

            viewer._layer_dcminfo = new Konva.Layer();
            viewer._stage.add(viewer._layer_dcminfo);

            viewer._layer_ct = new Konva.Layer();
            viewer._stage.add(viewer._layer_ct);

            viewer._layer_refline = new Konva.Layer();
            viewer._stage.add(viewer._layer_refline);
        }
    });
})();

[lavrton]

@DMIAOCHEN So how many layer you have? Having a lot of canvas elements on page is not a good way.

[DMIAOCHEN]

I think so too, there are at least six stage and one stage has seven layers before, now i have delete some layers, remain two layer in one stage, and do not call destroyChildren and new shape every times, use find to get the existing shape instead, then this is more better!
thanks a lot~ now i finally found konvajs is high performance framework!^_^

[lavrton]

👍