TooltipView.js

define(function (require) {

    var TooltipContent = require('./TooltipContent');
    var zrUtil = require('zrender/core/util');
    var formatUtil = require('../../util/format');
    var numberUtil = require('../../util/number');
    var findPointFromSeries = require('../axisPointer/findPointFromSeries');
    var parsePercent = numberUtil.parsePercent;
    var env = require('zrender/core/env');
    var Model = require('../../model/Model');
    var globalListener = require('../axisPointer/globalListener');
    var axisHelper = require('../../coord/axisHelper');

    var bind = zrUtil.bind;
    var each = zrUtil.each;


    require('../../echarts').extendComponentView({

        type: 'tooltip',

        init: function (ecModel, api) {
            if (env.node) {
                return;
            }
            var tooltipContent = new TooltipContent(api.getDom(), api);
            this._tooltipContent = tooltipContent;
        },

        render: function (tooltipModel, ecModel, api) {
            if (env.node) {
                return;
            }

            // Reset
            this.group.removeAll();

            /**
             * @private
             * @type {module:echarts/component/tooltip/TooltipModel}
             */
            this._tooltipModel = tooltipModel;

            /**
             * @private
             * @type {module:echarts/model/Global}
             */
            this._ecModel = ecModel;

            /**
             * @private
             * @type {module:echarts/ExtensionAPI}
             */
            this._api = api;

            /**
             * @private
             * @type {Array.<Array.<Object>>}
             */
            this._lastDataByCoordSys;

            /**
             * @private
             * @type {boolean}
             */
            this._alwaysShowContent = tooltipModel.get('alwaysShowContent');

            var tooltipContent = this._tooltipContent;
            tooltipContent.update();
            tooltipContent.setEnterable(tooltipModel.get('enterable'));

            this._initGlobalListener();

            this._keepShow();
        },

        _initGlobalListener: function () {
            var tooltipModel = this._tooltipModel;
            var triggerOn = tooltipModel.get('triggerOn');

            globalListener.register(
                'itemTooltip',
                this._api,
                bind(function (currTrigger, e, dispatchAction) {
                    // If 'none', it is not controlled by mouse totally.
                    if (triggerOn !== 'none') {
                        if (triggerOn.indexOf(currTrigger) >= 0) {
                            this._tryShow(e, dispatchAction);
                        }
                        else if (currTrigger === 'leave') {
                            this._hide(dispatchAction);
                        }
                    }
                }, this)
            );
        },

        _keepShow: function () {
            var tooltipModel = this._tooltipModel;
            var ecModel = this._ecModel;
            var api = this._api;

            // Try to keep the tooltip show when refreshing
            if (this._lastX != null
                && this._lastY != null
                // When user is willing to control tooltip totally using API,
                // self.manuallyShowTip({x, y}) might cause tooltip hide,
                // which is not expected.
                && tooltipModel.get('triggerOn') !== 'none'
            ) {
                var self = this;
                clearTimeout(this._refreshUpdateTimeout);
                this._refreshUpdateTimeout = setTimeout(function () {
                    // Show tip next tick after other charts are rendered
                    // In case highlight action has wrong result
                    // FIXME
                    self.manuallyShowTip(tooltipModel, ecModel, api, {
                        x: self._lastX,
                        y: self._lastY
                    });
                });
            }
        },

        /**
         * Show tip manually by
         * dispatchAction({
         *     type: 'showTip',
         *     x: 10,
         *     y: 10
         * });
         * Or
         * dispatchAction({
         *      type: 'showTip',
         *      seriesIndex: 0,
         *      dataIndex or dataIndexInside or name
         * });
         *
         *  TODO Batch
         */
        manuallyShowTip: function (tooltipModel, ecModel, api, payload) {
            if (payload.from === this.uid || env.node) {
                return;
            }

            var dispatchAction = makeDispatchAction(payload, api);

            // Reset ticket
            this._ticket = '';

            var seriesIndex = payload.seriesIndex;
            var dataByCoordSys = payload.dataByCoordSys;

            // When triggered from axisPointer.
            if (dataByCoordSys) {
                this._tryShow({
                    offsetX: payload.x,
                    offsetY: payload.y,
                    position: payload.position,
                    event: {},
                    dataByCoordSys: payload.dataByCoordSys,
                    tooltipOption: payload.tooltipOption
                }, dispatchAction);
            }
            else if (seriesIndex != null) {
                var pointInfo = findPointFromSeries(payload, ecModel);
                var cx = pointInfo.point[0];
                var cy = pointInfo.point[1];
                if (cx != null && cy != null) {
                    this._tryShow({
                        offsetX: cx,
                        offsetY: cy,
                        position: payload.position,
                        target: pointInfo.el,
                        event: {}
                    }, dispatchAction);
                }
            }
            else if (payload.x != null && payload.y != null) {
                this._tryShow({
                    offsetX: payload.x,
                    offsetY: payload.y,
                    position: payload.position,
                    target: api.getZr().handler.findHover(payload.x, payload.y),
                    event: {}
                }, dispatchAction);
            }
        },

        manuallyHideTip: function (tooltipModel, ecModel, api, payload) {
            var tooltipContent = this._tooltipContent;

            if (!this._alwaysShowContent) {
                tooltipContent.hideLater(this._tooltipModel.get('hideDelay'));
            }

            this._lastX = this._lastY = null;

            if (payload.from !== this.uid) {
                this._hide(makeDispatchAction(payload, api));
            }
        },

        _tryShow: function (e, dispatchAction) {
            var el = e.target;
            var tooltipModel = this._tooltipModel;

            if (!tooltipModel) {
                return;
            }

            // Save mouse x, mouse y. So we can try to keep showing the tip if chart is refreshed
            this._lastX = e.offsetX;
            this._lastY = e.offsetY;

            var dataByCoordSys = e.dataByCoordSys;
            if (dataByCoordSys && dataByCoordSys.length) {
                this._showAxisTooltip(dataByCoordSys, e);
            }
            // Always show item tooltip if mouse is on the element with dataIndex
            else if (el && el.dataIndex != null) {
                this._lastDataByCoordSys = null;
                this._showSeriesItemTooltip(e, el, dispatchAction);
            }
            // Tooltip provided directly. Like legend.
            else if (el && el.tooltip) {
                this._lastDataByCoordSys = null;
                this._showComponentItemTooltip(e, el, dispatchAction);
            }
            else {
                this._lastDataByCoordSys = null;
                this._hide(dispatchAction);
            }
        },

        _showOrMove: function (tooltipModel, cb) {
            // showDelay is used in this case: tooltip.enterable is set
            // as true. User intent to move mouse into tooltip and click
            // something. `showDelay` makes it easyer to enter the content
            // but tooltip do not move immediately.
            var delay = tooltipModel.get('showDelay');
            cb = zrUtil.bind(cb, this);
            clearTimeout(this._showTimout);
            delay > 0
                ? (this._showTimout = setTimeout(cb, delay))
                : cb();
        },

        _showAxisTooltip: function (dataByCoordSys, e) {
            var ecModel = this._ecModel;
            var globalTooltipModel = this._tooltipModel;
            var point = [e.offsetX, e.offsetY];
            var singleDefaultHTML = [];
            var singleParamsList = [];
            var singleTooltipModel = buildTooltipModel([
                e.tooltipOption,
                globalTooltipModel
            ]);

            each(dataByCoordSys, function (itemCoordSys) {
                // var coordParamList = [];
                // var coordDefaultHTML = [];
                // var coordTooltipModel = buildTooltipModel([
                //     e.tooltipOption,
                //     itemCoordSys.tooltipOption,
                //     ecModel.getComponent(itemCoordSys.coordSysMainType, itemCoordSys.coordSysIndex),
                //     globalTooltipModel
                // ]);
                // var displayMode = coordTooltipModel.get('displayMode');
                // var paramsList = displayMode === 'single' ? singleParamsList : [];

                each(itemCoordSys.dataByAxis, function (item) {
                    var axisModel = ecModel.getComponent(item.axisDim + 'Axis', item.axisIndex);
                    var axisValue = item.value;
                    var seriesDefaultHTML = [];

                    if (!axisModel || axisValue == null) {
                        return;
                    }

                    zrUtil.each(item.seriesDataIndices, function (idxItem) {
                        var series = ecModel.getSeriesByIndex(idxItem.seriesIndex);
                        var dataIndex = idxItem.dataIndexInside;
                        var dataParams = series && series.getDataParams(dataIndex);
                        dataParams.axisDim = item.axisDim;
                        dataParams.axisIndex = item.axisIndex;
                        dataParams.axisType = item.axisType;
                        dataParams.axisId = item.axisId;
                        dataParams.axisValue = axisHelper.getAxisRawValue(axisModel.axis, axisValue);
                        dataParams.axisValueLabel = item.valueLabel;

                        if (dataParams) {
                            singleParamsList.push(dataParams);
                            seriesDefaultHTML.push(series.formatTooltip(dataIndex, true));
                        }
                    });

                    // Default tooltip content
                    // FIXME
                    // (1) shold be the first data which has name?
                    // (2) themeRiver, firstDataIndex is array, and first line is unnecessary.
                    var firstLine = item.valueLabel;
                    singleDefaultHTML.push(
                        (firstLine ? formatUtil.encodeHTML(firstLine) + '<br />' : '')
                        + seriesDefaultHTML.join('<br />')
                    );
                });
            }, this);

            // In most case, the second axis is shown upper than the first one.
            singleDefaultHTML.reverse();
            singleDefaultHTML = singleDefaultHTML.join('<br /><br />');

            var positionExpr = e.position;
            this._showOrMove(singleTooltipModel, function () {
                if (this._updateContentNotChangedOnAxis(dataByCoordSys)) {
                    this._updatePosition(
                        singleTooltipModel,
                        positionExpr,
                        point[0], point[1],
                        this._tooltipContent,
                        singleParamsList
                    );
                }
                else {
                    this._showTooltipContent(
                        singleTooltipModel, singleDefaultHTML, singleParamsList, Math.random(),
                        point[0], point[1], positionExpr
                    );
                }
            });

            // Do not trigger events here, because this branch only be entered
            // from dispatchAction.
        },

        _showSeriesItemTooltip: function (e, el, dispatchAction) {
            var ecModel = this._ecModel;
            // Use dataModel in element if possible
            // Used when mouseover on a element like markPoint or edge
            // In which case, the data is not main data in series.
            var seriesIndex = el.seriesIndex;
            var seriesModel = ecModel.getSeriesByIndex(seriesIndex);

            // For example, graph link.
            var dataModel = el.dataModel || seriesModel;
            var dataIndex = el.dataIndex;
            var dataType = el.dataType;
            var data = dataModel.getData();

            var tooltipModel = buildTooltipModel([
                data.getItemModel(dataIndex),
                dataModel,
                seriesModel && (seriesModel.coordinateSystem || {}).model,
                this._tooltipModel
            ]);

            var tooltipTrigger = tooltipModel.get('trigger');
            if (tooltipTrigger != null && tooltipTrigger !== 'item') {
                return;
            }

            var params = dataModel.getDataParams(dataIndex, dataType);
            var defaultHtml = dataModel.formatTooltip(dataIndex, false, dataType);
            var asyncTicket = 'item_' + dataModel.name + '_' + dataIndex;

            this._showOrMove(tooltipModel, function () {
                this._showTooltipContent(
                    tooltipModel, defaultHtml, params, asyncTicket,
                    e.offsetX, e.offsetY, e.position, e.target
                );
            });

            // FIXME
            // duplicated showtip if manuallyShowTip is called from dispatchAction.
            dispatchAction({
                type: 'showTip',
                dataIndexInside: dataIndex,
                dataIndex: data.getRawIndex(dataIndex),
                seriesIndex: seriesIndex,
                from: this.uid
            });
        },

        _showComponentItemTooltip: function (e, el, dispatchAction) {
            var tooltipOpt = el.tooltip;
            if (typeof tooltipOpt === 'string') {
                var content = tooltipOpt;
                tooltipOpt = {
                    content: content,
                    // Fixed formatter
                    formatter: content
                };
            }
            var subTooltipModel = new Model(tooltipOpt, this._tooltipModel, this._ecModel);
            var defaultHtml = subTooltipModel.get('content');
            var asyncTicket = Math.random();

            // Do not check whether `trigger` is 'none' here, because `trigger`
            // only works on cooridinate system. In fact, we have not found case
            // that requires setting `trigger` nothing on component yet.

            this._showOrMove(subTooltipModel, function () {
                this._showTooltipContent(
                    subTooltipModel, defaultHtml, subTooltipModel.get('formatterParams') || {},
                    asyncTicket, e.offsetX, e.offsetY, e.position, el
                );
            });

            // If not dispatch showTip, tip may be hide triggered by axis.
            dispatchAction({
                type: 'showTip',
                from: this.uid
            });
        },

        _showTooltipContent: function (
            tooltipModel, defaultHtml, params, asyncTicket, x, y, positionExpr, el
        ) {
            // Reset ticket
            this._ticket = '';

            if (!tooltipModel.get('showContent') || !tooltipModel.get('show')) {
                return;
            }

            var tooltipContent = this._tooltipContent;

            var formatter = tooltipModel.get('formatter');
            positionExpr = positionExpr || tooltipModel.get('position');
            var html = defaultHtml;

            if (formatter && typeof formatter === 'string') {
                html = formatUtil.formatTpl(formatter, params, true);
            }
            else if (typeof formatter === 'function') {
                var callback = bind(function (cbTicket, html) {
                    if (cbTicket === this._ticket) {
                        tooltipContent.setContent(html);
                        this._updatePosition(
                            tooltipModel, positionExpr, x, y, tooltipContent, params, el
                        );
                    }
                }, this);
                this._ticket = asyncTicket;
                html = formatter(params, asyncTicket, callback);
            }

            tooltipContent.setContent(html);
            tooltipContent.show(tooltipModel);

            this._updatePosition(
                tooltipModel, positionExpr, x, y, tooltipContent, params, el
            );
        },

        /**
         * @param  {string|Function|Array.<number>} positionExpr
         * @param  {number} x Mouse x
         * @param  {number} y Mouse y
         * @param  {boolean} confine Whether confine tooltip content in view rect.
         * @param  {Object|<Array.<Object>} params
         * @param  {module:zrender/Element} el target element
         * @param  {module:echarts/ExtensionAPI} api
         * @return {Array.<number>}
         */
        _updatePosition: function (tooltipModel, positionExpr, x, y, content, params, el) {
            var viewWidth = this._api.getWidth();
            var viewHeight = this._api.getHeight();
            positionExpr = positionExpr || tooltipModel.get('position');

            var rect = el && el.getBoundingRect().clone();
            el && rect.applyTransform(el.transform);
            if (typeof positionExpr === 'function') {
                // Callback of position can be an array or a string specify the position
                positionExpr = positionExpr([x, y], params, content.el, rect);
            }

            var contentSize = content.getSize();
            var align = tooltipModel.get('align');
            var vAlign = tooltipModel.get('verticalAlign');

            if (zrUtil.isArray(positionExpr)) {
                x = parsePercent(positionExpr[0], viewWidth);
                y = parsePercent(positionExpr[1], viewHeight);
            }
            // Specify tooltip position by string 'top' 'bottom' 'left' 'right' around graphic element
            else if (typeof positionExpr === 'string' && el) {
                var pos = calcTooltipPosition(
                    positionExpr, rect, contentSize
                );
                x = pos[0];
                y = pos[1];
            }
            else {
                var pos = refixTooltipPosition(
                    x, y, content.el, viewWidth, viewHeight, align ? 0 : 20, vAlign ? 0 : 20
                );
                x = pos[0];
                y = pos[1];
            }

            align && (x -= align === 'center' ? contentSize[0] / 2 : align === 'right' ? contentSize[0] : 0);
            vAlign && (y -= vAlign === 'middle' ? contentSize[1] / 2 : vAlign === 'bottom' ? contentSize[1] : 0);

            if (tooltipModel.get('confine')) {
                var pos = confineTooltipPosition(
                    x, y, content.el, viewWidth, viewHeight
                );
                x = pos[0];
                y = pos[1];
            }

            content.moveTo(x, y);
        },

        // FIXME
        // Should we remove this but leave this to user?
        _updateContentNotChangedOnAxis: function (dataByCoordSys) {
            var lastCoordSys = this._lastDataByCoordSys;
            var contentNotChanged = !!lastCoordSys
                && lastCoordSys.length === dataByCoordSys.length;

            each(lastCoordSys, function (lastItemCoordSys, indexCoordSys) {
                var lastDataByAxis = lastItemCoordSys.dataByAxis || {};
                var thisItemCoordSys = dataByCoordSys[indexCoordSys] || {};
                var thisDataByAxis = thisItemCoordSys.dataByAxis || [];
                contentNotChanged &= lastDataByAxis.length === thisDataByAxis.length;

                each(lastDataByAxis, function (lastItem, indexAxis) {
                    var thisItem = thisDataByAxis[indexAxis] || {};
                    var lastIndices = lastItem.seriesDataIndices || [];
                    var newIndices = thisItem.seriesDataIndices || [];

                    contentNotChanged &=
                        lastItem.value === thisItem.value
                        && lastItem.axisType === thisItem.axisType
                        && lastItem.axisId === thisItem.axisId
                        && lastIndices.length === newIndices.length;

                    each(lastIndices, function (lastIdxItem, j) {
                        var newIdxItem = newIndices[j];
                        contentNotChanged &=
                            lastIdxItem.seriesIndex === newIdxItem.seriesIndex
                            && lastIdxItem.dataIndex === newIdxItem.dataIndex;
                    });
                });
            });

            this._lastDataByCoordSys = dataByCoordSys;

            return !!contentNotChanged;
        },

        _hide: function (dispatchAction) {
            // Do not directly hideLater here, because this behavior may be prevented
            // in dispatchAction when showTip is dispatched.

            // FIXME
            // duplicated hideTip if manuallyHideTip is called from dispatchAction.
            this._lastDataByCoordSys = null;
            dispatchAction({
                type: 'hideTip',
                from: this.uid
            });
        },

        dispose: function (ecModel, api) {
            if (env.node) {
                return;
            }
            this._tooltipContent.hide();
            globalListener.unregister('itemTooltip', api);
        }
    });


    /**
     * @param {Array.<Object|module:echarts/model/Model>} modelCascade
     * From top to bottom. (the last one should be globalTooltipModel);
     */
    function buildTooltipModel(modelCascade) {
        var resultModel = modelCascade.pop();
        while (modelCascade.length) {
            var tooltipOpt = modelCascade.pop();
            if (tooltipOpt) {
                if (tooltipOpt instanceof Model) {
                    tooltipOpt = tooltipOpt.get('tooltip', true);
                }
                // In each data item tooltip can be simply write:
                // {
                //  value: 10,
                //  tooltip: 'Something you need to know'
                // }
                if (typeof tooltipOpt === 'string') {
                    tooltipOpt = {formatter: tooltipOpt};
                }
                resultModel = new Model(tooltipOpt, resultModel, resultModel.ecModel);
            }
        }
        return resultModel;
    }

    function makeDispatchAction(payload, api) {
        return payload.dispatchAction || zrUtil.bind(api.dispatchAction, api);
    }

    function refixTooltipPosition(x, y, el, viewWidth, viewHeight, gapH, gapV) {
        var width = el.clientWidth;
        var height = el.clientHeight;

        if (x + width + gapH > viewWidth) {
            x -= width + gapH;
        }
        else {
            x += gapH;
        }
        if (y + height + gapV > viewHeight) {
            y -= height + gapV;
        }
        else {
            y += gapV;
        }
        return [x, y];
    }

    function confineTooltipPosition(x, y, el, viewWidth, viewHeight) {
        var width = el.clientWidth;
        var height = el.clientHeight;

        x = Math.min(x + width, viewWidth) - width;
        y = Math.min(y + height, viewHeight) - height;
        x = Math.max(x, 0);
        y = Math.max(y, 0);

        return [x, y];
    }

    function calcTooltipPosition(position, rect, contentSize) {
        var domWidth = contentSize[0];
        var domHeight = contentSize[1];
        var gap = 5;
        var x = 0;
        var y = 0;
        var rectWidth = rect.width;
        var rectHeight = rect.height;
        switch (position) {
            case 'inside':
                x = rect.x + rectWidth / 2 - domWidth / 2;
                y = rect.y + rectHeight / 2 - domHeight / 2;
                break;
            case 'top':
                x = rect.x + rectWidth / 2 - domWidth / 2;
                y = rect.y - domHeight - gap;
                break;
            case 'bottom':
                x = rect.x + rectWidth / 2 - domWidth / 2;
                y = rect.y + rectHeight + gap;
                break;
            case 'left':
                x = rect.x - domWidth - gap;
                y = rect.y + rectHeight / 2 - domHeight / 2;
                break;
            case 'right':
                x = rect.x + rectWidth + gap;
                y = rect.y + rectHeight / 2 - domHeight / 2;
        }
        return [x, y];
    }

});