detailed-painter.js

javascript实现的关于时间线的简单例子。

/*==================================================
 *  Detailed Event Painter
 *==================================================
 */

// Note: a number of features from original-painter 
//       are not yet implemented in detailed painter.
//       Eg classname, id attributes for icons, labels, tapes

Timeline.DetailedEventPainter = function(params) {
    this._params = params;
    this._onSelectListeners = [];
    
    this._filterMatcher = null;
    this._highlightMatcher = null;
    this._frc = null;
    
    this._eventIdToElmt = {};
};

Timeline.DetailedEventPainter.prototype.initialize = function(band, timeline) {
    this._band = band;
    this._timeline = timeline;
    
    this._backLayer = null;
    this._eventLayer = null;
    this._lineLayer = null;
    this._highlightLayer = null;
    
    this._eventIdToElmt = null;
};

Timeline.DetailedEventPainter.prototype.getType = function() {
    return 'detailed';
};

Timeline.DetailedEventPainter.prototype.addOnSelectListener = function(listener) {
    this._onSelectListeners.push(listener);
};

Timeline.DetailedEventPainter.prototype.removeOnSelectListener = function(listener) {
    for (var i = 0; i < this._onSelectListeners.length; i++) {
        if (this._onSelectListeners[i] == listener) {
            this._onSelectListeners.splice(i, 1);
            break;
        }
    }
};

Timeline.DetailedEventPainter.prototype.getFilterMatcher = function() {
    return this._filterMatcher;
};

Timeline.DetailedEventPainter.prototype.setFilterMatcher = function(filterMatcher) {
    this._filterMatcher = filterMatcher;
};

Timeline.DetailedEventPainter.prototype.getHighlightMatcher = function() {
    return this._highlightMatcher;
};

Timeline.DetailedEventPainter.prototype.setHighlightMatcher = function(highlightMatcher) {
    this._highlightMatcher = highlightMatcher;
};

Timeline.DetailedEventPainter.prototype.paint = function() {
    var eventSource = this._band.getEventSource();
    if (eventSource == null) {
        return;
    }
    
    this._eventIdToElmt = {};
    this._prepareForPainting();
    
    var eventTheme = this._params.theme.event;
    var trackHeight = Math.max(eventTheme.track.height, this._frc.getLineHeight());
    var metrics = {
        trackOffset:    Math.round(this._band.getViewWidth() / 2 - trackHeight / 2),
        trackHeight:    trackHeight,
        trackGap:       eventTheme.track.gap,
        trackIncrement: trackHeight + eventTheme.track.gap,
        icon:           eventTheme.instant.icon,
        iconWidth:      eventTheme.instant.iconWidth,
        iconHeight:     eventTheme.instant.iconHeight,
        labelWidth:     eventTheme.label.width
    }
    
    var minDate = this._band.getMinDate();
    var maxDate = this._band.getMaxDate();
    
    var filterMatcher = (this._filterMatcher != null) ? 
        this._filterMatcher :
        function(evt) { return true; };
    var highlightMatcher = (this._highlightMatcher != null) ? 
        this._highlightMatcher :
        function(evt) { return -1; };
    
    var iterator = eventSource.getEventReverseIterator(minDate, maxDate);
    while (iterator.hasNext()) {
        var evt = iterator.next();
        if (filterMatcher(evt)) {
            this.paintEvent(evt, metrics, this._params.theme, highlightMatcher(evt));
        }
    }
    
    this._highlightLayer.style.display = "block";
    this._lineLayer.style.display = "block";
    this._eventLayer.style.display = "block";
    // update the band object for max number of tracks in this section of the ether
    this._band.updateEventTrackInfo(this._lowerTracks.length + this._upperTracks.length,
                                 metrics.trackIncrement); 
};

Timeline.DetailedEventPainter.prototype.softPaint = function() {
};

Timeline.DetailedEventPainter.prototype._prepareForPainting = function() {
    var band = this._band;
        
    if (this._backLayer == null) {
        this._backLayer = this._band.createLayerDiv(0, "timeline-band-events");
        this._backLayer.style.visibility = "hidden";
        
        var eventLabelPrototype = document.createElement("span");
        eventLabelPrototype.className = "timeline-event-label";
        this._backLayer.appendChild(eventLabelPrototype);
        this._frc = SimileAjax.Graphics.getFontRenderingContext(eventLabelPrototype);
    }
    this._frc.update();
    this._lowerTracks = [];
    this._upperTracks = [];
    
    if (this._highlightLayer != null) {
        band.removeLayerDiv(this._highlightLayer);
    }
    this._highlightLayer = band.createLayerDiv(105, "timeline-band-highlights");
    this._highlightLayer.style.display = "none";
    
    if (this._lineLayer != null) {
        band.removeLayerDiv(this._lineLayer);
    }
    this._lineLayer = band.createLayerDiv(110, "timeline-band-lines");
    this._lineLayer.style.display = "none";
    
    if (this._eventLayer != null) {
        band.removeLayerDiv(this._eventLayer);
    }
    this._eventLayer = band.createLayerDiv(110, "timeline-band-events");
    this._eventLayer.style.display = "none";
};

Timeline.DetailedEventPainter.prototype.paintEvent = function(evt, metrics, theme, highlightIndex) {
    if (evt.isInstant()) {
        this.paintInstantEvent(evt, metrics, theme, highlightIndex);
    } else {
        this.paintDurationEvent(evt, metrics, theme, highlightIndex);
    }
};
    
Timeline.DetailedEventPainter.prototype.paintInstantEvent = function(evt, metrics, theme, highlightIndex) {
    if (evt.isImprecise()) {
        this.paintImpreciseInstantEvent(evt, metrics, theme, highlightIndex);
    } else {
        this.paintPreciseInstantEvent(evt, metrics, theme, highlightIndex);
    }
}

Timeline.DetailedEventPainter.prototype.paintDurationEvent = function(evt, metrics, theme, highlightIndex) {
    if (evt.isImprecise()) {
        this.paintImpreciseDurationEvent(evt, metrics, theme, highlightIndex);
    } else {
        this.paintPreciseDurationEvent(evt, metrics, theme, highlightIndex);
    }
}
    
Timeline.DetailedEventPainter.prototype.paintPreciseInstantEvent = function(evt, metrics, theme, highlightIndex) {
    var doc = this._timeline.getDocument();
    var text = evt.getText();
    
    var startDate = evt.getStart();
    var startPixel = Math.round(this._band.dateToPixelOffset(startDate));
    var iconRightEdge = Math.round(startPixel + metrics.iconWidth / 2);
    var iconLeftEdge = Math.round(startPixel - metrics.iconWidth / 2);
    
    var labelSize = this._frc.computeSize(text);
    var iconTrack = this._findFreeTrackForSolid(iconRightEdge, startPixel);
    var iconElmtData = this._paintEventIcon(evt, iconTrack, iconLeftEdge, metrics, theme);
    
    var labelLeft = iconRightEdge + theme.event.label.offsetFromLine;
    var labelTrack = iconTrack;
    
    var iconTrackData = this._getTrackData(iconTrack);
    if (Math.min(iconTrackData.solid, iconTrackData.text) >= labelLeft + labelSize.width) { // label on the same track, to the right of icon
        iconTrackData.solid = iconLeftEdge;
        iconTrackData.text = labelLeft;
    } else { // label on a different track, below icon
        iconTrackData.solid = iconLeftEdge;
        
        labelLeft = startPixel + theme.event.label.offsetFromLine;
        labelTrack = this._findFreeTrackForText(iconTrack, labelLeft + labelSize.width, function(t) { t.line = startPixel - 2; });
        this._getTrackData(labelTrack).text = iconLeftEdge;
        
        this._paintEventLine(evt, startPixel, iconTrack, labelTrack, metrics, theme);
    }
    
    var labelTop = Math.round(
        metrics.trackOffset + labelTrack * metrics.trackIncrement + 
        metrics.trackHeight / 2 - labelSize.height / 2);
        
    var labelElmtData = this._paintEventLabel(evt, text, labelLeft, labelTop, labelSize.width, labelSize.height, theme);

    var self = this;
    var clickHandler = function(elmt, domEvt, target) {
        return self._onClickInstantEvent(iconElmtData.elmt, domEvt, evt);
    };
    SimileAjax.DOM.registerEvent(iconElmtData.elmt, "mousedown", clickHandler);
    SimileAjax.DOM.registerEvent(labelElmtData.elmt, "mousedown", clickHandler);
    
    this._createHighlightDiv(highlightIndex, iconElmtData, theme);
    
    this._eventIdToElmt[evt.getID()] = iconElmtData.elmt;
};

Timeline.DetailedEventPainter.prototype.paintImpreciseInstantEvent = function(evt, metrics, theme, highlightIndex) {
    var doc = this._timeline.getDocument();
    var text = evt.getText();
    
    var startDate = evt.getStart();
    var endDate = evt.getEnd();
    var startPixel = Math.round(this._band.dateToPixelOffset(startDate));
    var endPixel = Math.round(this._band.dateToPixelOffset(endDate));
    
    var iconRightEdge = Math.round(startPixel + metrics.iconWidth / 2);
    var iconLeftEdge = Math.round(startPixel - metrics.iconWidth / 2);
    
    var labelSize = this._frc.computeSize(text);
    var iconTrack = this._findFreeTrackForSolid(endPixel, startPixel);
    
    var tapeElmtData = this._paintEventTape(evt, iconTrack, startPixel, endPixel, 
        theme.event.instant.impreciseColor, theme.event.instant.impreciseOpacity, metrics, theme);
    var iconElmtData = this._paintEventIcon(evt, iconTrack, iconLeftEdge, metrics, theme);
    
    var iconTrackData = this._getTrackData(iconTrack);
    iconTrackData.solid = iconLeftEdge;
    
    var labelLeft = iconRightEdge + theme.event.label.offsetFromLine;
    var labelRight = labelLeft + labelSize.width;
    var labelTrack;
    if (labelRight < endPixel) {
        labelTrack = iconTrack;
    } else {
        labelLeft = startPixel + theme.event.label.offsetFromLine;
        labelRight = labelLeft + labelSize.width;
    
        labelTrack = this._findFreeTrackForText(iconTrack, labelRight, function(t) { t.line = startPixel - 2; });
        this._getTrackData(labelTrack).text = iconLeftEdge;
        
        this._paintEventLine(evt, startPixel, iconTrack, labelTrack, metrics, theme);
    }
    var labelTop = Math.round(
        metrics.trackOffset + labelTrack * metrics.trackIncrement + 
        metrics.trackHeight / 2 - labelSize.height / 2);
        
    var labelElmtData = this._paintEventLabel(evt, text, labelLeft, labelTop, labelSize.width, labelSize.height, theme);
    
    var self = this;
    var clickHandler = function(elmt, domEvt, target) {
        return self._onClickInstantEvent(iconElmtData.elmt, domEvt, evt);
    };
    SimileAjax.DOM.registerEvent(iconElmtData.elmt, "mousedown", clickHandler);
    SimileAjax.DOM.registerEvent(tapeElmtData.elmt, "mousedown", clickHandler);
    SimileAjax.DOM.registerEvent(labelElmtData.elmt, "mousedown", clickHandler);
    
    this._createHighlightDiv(highlightIndex, iconElmtData, theme);
    
    this._eventIdToElmt[evt.getID()] = iconElmtData.elmt;
};

Timeline.DetailedEventPainter.prototype.paintPreciseDurationEvent = function(evt, metrics, theme, highlightIndex) {
    var doc = this._timeline.getDocument();
    var text = evt.getText();
    
    var startDate = evt.getStart();
    var endDate = evt.getEnd();
    var startPixel = Math.round(this._band.dateToPixelOffset(startDate));
    var endPixel = Math.round(this._band.dateToPixelOffset(endDate));
    
    var labelSize = this._frc.computeSize(text);
    var tapeTrack = this._findFreeTrackForSolid(endPixel);
    var color = evt.getColor();
    color = color != null ? color : theme.event.duration.color;
    
    var tapeElmtData = this._paintEventTape(evt, tapeTrack, startPixel, endPixel, color, 100, metrics, theme);
    
    var tapeTrackData = this._getTrackData(tapeTrack);
    tapeTrackData.solid = startPixel;
    
    var labelLeft = startPixel + theme.event.label.offsetFromLine;
    var labelTrack = this._findFreeTrackForText(tapeTrack, labelLeft + labelSize.width, function(t) { t.line = startPixel - 2; });
    this._getTrackData(labelTrack).text = startPixel - 2;
    
    this._paintEventLine(evt, startPixel, tapeTrack, labelTrack, metrics, theme);
    
    var labelTop = Math.round(
        metrics.trackOffset + labelTrack * metrics.trackIncrement + 
        metrics.trackHeight / 2 - labelSize.height / 2);
        
    var labelElmtData = this._paintEventLabel(evt, text, labelLeft, labelTop, labelSize.width, labelSize.height, theme);

    var self = this;
    var clickHandler = function(elmt, domEvt, target) {
        return self._onClickDurationEvent(tapeElmtData.elmt, domEvt, evt);
    };
    SimileAjax.DOM.registerEvent(tapeElmtData.elmt, "mousedown", clickHandler);
    SimileAjax.DOM.registerEvent(labelElmtData.elmt, "mousedown", clickHandler);
    
    this._createHighlightDiv(highlightIndex, tapeElmtData, theme);
    
    this._eventIdToElmt[evt.getID()] = tapeElmtData.elmt;
};

Timeline.DetailedEventPainter.prototype.paintImpreciseDurationEvent = function(evt, metrics, theme, highlightIndex) {
    var doc = this._timeline.getDocument();
    var text = evt.getText();
    
    var startDate = evt.getStart();
    var latestStartDate = evt.getLatestStart();
    var endDate = evt.getEnd();
    var earliestEndDate = evt.getEarliestEnd();
    
    var startPixel = Math.round(this._band.dateToPixelOffset(startDate));
    var latestStartPixel = Math.round(this._band.dateToPixelOffset(latestStartDate));
    var endPixel = Math.round(this._band.dateToPixelOffset(endDate));
    var earliestEndPixel = Math.round(this._band.dateToPixelOffset(earliestEndDate));
    
    var labelSize = this._frc.computeSize(text);
    var tapeTrack = this._findFreeTrackForSolid(endPixel);
    var color = evt.getColor();
    color = color != null ? color : theme.event.duration.color;
    
    var impreciseTapeElmtData = this._paintEventTape(evt, tapeTrack, startPixel, endPixel, 
        theme.event.duration.impreciseColor, theme.event.duration.impreciseOpacity, metrics, theme);
    var tapeElmtData = this._paintEventTape(evt, tapeTrack, latestStartPixel, earliestEndPixel, color, 100, metrics, theme);
    
    var tapeTrackData = this._getTrackData(tapeTrack);
    tapeTrackData.solid = startPixel;