compact-painter.js

javascript实现的关于时间线的简单例子。

    var anchorPixel = getPixelOffset(anchorDate);
    var newTracks = [];
    
    var tapeHeightOccupied = 0;         // how many pixels (vertically) the tape occupies, including bottom margin
    var tapeTrackCount = 0;             // how many tracks the tape takes up, usually just 1
    var tapeLastTrackExtraSpace = 0;    // on the last track that the tape occupies, how many pixels are left (for icon and label to occupy as well)
    if (tapeData != null) {
        tapeHeightOccupied = metrics.tapeHeight + metrics.tapeBottomMargin;
        tapeTrackCount = Math.ceil(metrics.tapeHeight / metrics.trackHeight);
        
        var tapeEndPixelOffset = getPixelOffset(tapeData.end) - anchorPixel;
        var tapeStartPixelOffset = getPixelOffset(tapeData.start) - anchorPixel;
        
        for (var t = 0; t < tapeTrackCount; t++) {
            newTracks.push({ start: tapeStartPixelOffset, end: tapeEndPixelOffset });
        }
        
        tapeLastTrackExtraSpace = metrics.trackHeight - (tapeHeightOccupied % metrics.tapeHeight);
    }
    
    var iconStartPixelOffset = 0;        // where the icon starts compared to the anchor pixel; 
                                         // this can be negative if the icon is center-aligned around the anchor
    var iconHorizontalSpaceOccupied = 0; // how many pixels the icon take up from the anchor pixel, 
                                         // including the gap between the icon and the label
    if (iconData != null) {
        if ("iconAlign" in iconData && iconData.iconAlign == "center") {
            iconStartPixelOffset = -Math.floor(iconData.width / 2);
        }
        iconHorizontalSpaceOccupied = iconStartPixelOffset + iconData.width + metrics.iconLabelGap;
        
        if (tapeTrackCount > 0) {
            newTracks[tapeTrackCount - 1].end = Math.max(newTracks[tapeTrackCount - 1].end, iconHorizontalSpaceOccupied);
        }
        
        var iconHeight = iconData.height + metrics.iconBottomMargin + tapeLastTrackExtraSpace;
        while (iconHeight > 0) {
            newTracks.push({ start: iconStartPixelOffset, end: iconHorizontalSpaceOccupied });
            iconHeight -= metrics.trackHeight;
        }
    }
    
    var text = labelData.text;
    var labelSize = this._frc.computeSize(text);
    var labelHeight = labelSize.height + metrics.labelBottomMargin + tapeLastTrackExtraSpace;
    var labelEndPixelOffset = iconHorizontalSpaceOccupied + labelSize.width + metrics.labelRightMargin;
    if (tapeTrackCount > 0) {
        newTracks[tapeTrackCount - 1].end = Math.max(newTracks[tapeTrackCount - 1].end, labelEndPixelOffset);
    }
    for (var i = 0; labelHeight > 0; i++) {
        if (tapeTrackCount + i < newTracks.length) {
            var track = newTracks[tapeTrackCount + i];
            track.end = labelEndPixelOffset;
        } else {
            newTracks.push({ start: 0, end: labelEndPixelOffset });
        }
        labelHeight -= metrics.trackHeight;
    }
    
    /*
     *  Try to fit the new track on top of the existing tracks, then
     *  render the various elements.
     */
    var firstTrack = this._fitTracks(anchorPixel, newTracks);
    var verticalPixelOffset = firstTrack * metrics.trackHeight + metrics.trackOffset;
    var result = {};
    
    result.labelElmtData = this._paintEventLabel(
        commonData,
        labelData,
        anchorPixel + iconHorizontalSpaceOccupied,
        verticalPixelOffset + tapeHeightOccupied,
        labelSize.width, 
        labelSize.height, 
        theme
    );
    
    if (tapeData != null) {
        if ("latestStart" in tapeData || "earliestEnd" in tapeData) {
            result.impreciseTapeElmtData = this._paintEventTape(
                commonData,
                tapeData,
                metrics.tapeHeight,
                verticalPixelOffset, 
                getPixelOffset(tapeData.start),
                getPixelOffset(tapeData.end),
                theme.event.duration.impreciseColor,
                theme.event.duration.impreciseOpacity, 
                metrics, 
                theme
            );
        }
        if (!tapeData.isInstant && "start" in tapeData && "end" in tapeData) {
            result.tapeElmtData = this._paintEventTape(
                commonData,
                tapeData,
                metrics.tapeHeight,
                verticalPixelOffset,
                anchorPixel,
                getPixelOffset("earliestEnd" in tapeData ? tapeData.earliestEnd : tapeData.end), 
                tapeData.color, 
                100, 
                metrics, 
                theme
            );
        }
    }
    
    if (iconData != null) {
        result.iconElmtData = this._paintEventIcon(
            commonData,
            iconData,
            verticalPixelOffset + tapeHeightOccupied,
            anchorPixel + iconStartPixelOffset,
            metrics, 
            theme
        );
    }
    //this._createHighlightDiv(highlightIndex, iconElmtData, theme);
    
    return result;
};

Timeline.CompactEventPainter.prototype._fitTracks = function(anchorPixel, newTracks) {
    var firstTrack;
    for (firstTrack = 0; firstTrack < this._tracks.length; firstTrack++) {
        var fit = true;
        for (var j = 0; j < newTracks.length && (firstTrack + j) < this._tracks.length; j++) {
            var existingTrack = this._tracks[firstTrack + j];
            var newTrack = newTracks[j];
            if (anchorPixel + newTrack.start < existingTrack) {
                fit = false;
                break;
            }
        }
        
        if (fit) {
            break;
        }
    }
    for (var i = 0; i < newTracks.length; i++) {
        this._tracks[firstTrack + i] = anchorPixel + newTracks[i].end;
    }
    
    return firstTrack;
};


Timeline.CompactEventPainter.prototype._paintEventIcon = function(commonData, iconData, top, left, metrics, theme) {
    var img = SimileAjax.Graphics.createTranslucentImage(iconData.url);
    var iconDiv = this._timeline.getDocument().createElement("div");
    iconDiv.className = 'timeline-event-icon' + ("className" in iconData ? (" " + iconData.className) : "");
    iconDiv.style.left = left + "px";
    iconDiv.style.top = top + "px";
    iconDiv.appendChild(img);
    
    if ("tooltip" in commonData && typeof commonData.tooltip == "string") {
        iconDiv.title = commonData.tooltip;
    }
    
    this._eventLayer.appendChild(iconDiv);
    
    return {
        left:   left,
        top:    top,
        width:  metrics.iconWidth,
        height: metrics.iconHeight,
        elmt:   iconDiv
    };
};

Timeline.CompactEventPainter.prototype._paintEventLabel = function(commonData, labelData, left, top, width, height, theme) {
    var doc = this._timeline.getDocument();
    
    var labelDiv = doc.createElement("div");
    labelDiv.className = 'timeline-event-label';

    labelDiv.style.left = left + "px";
    labelDiv.style.width = (width + 1) + "px";
    labelDiv.style.top = top + "px";
    labelDiv.innerHTML = labelData.text;

    if ("tooltip" in commonData && typeof commonData.tooltip == "string") {
        labelDiv.title = commonData.tooltip;
    }
    if ("color" in labelData && typeof labelData.color == "string") {
        labelDiv.style.color = labelData.color;
    }
    if ("className" in labelData && typeof labelData.className == "string") {
        labelDiv.className += ' ' + labelData.className;
    }
    
    this._eventLayer.appendChild(labelDiv);
    
    return {
        left:   left,
        top:    top,
        width:  width,
        height: height,
        elmt:   labelDiv
    };
};

Timeline.CompactEventPainter.prototype._paintEventTape = function(
    commonData, tapeData, height, top, startPixel, endPixel, color, opacity, metrics, theme) {
    
    var width = endPixel - startPixel;
    
    var tapeDiv = this._timeline.getDocument().createElement("div");
    tapeDiv.className = "timeline-event-tape"

    tapeDiv.style.left = startPixel + "px";
    tapeDiv.style.top = top + "px";
    tapeDiv.style.width = width + "px";
    tapeDiv.style.height = height + "px";

    if ("tooltip" in commonData && typeof commonData.tooltip == "string") {
        tapeDiv.title = commonData.tooltip;
    }
    if (color != null && typeof tapeData.color == "string") {
        tapeDiv.style.backgroundColor = color;
    }
    
    if ("backgroundImage" in tapeData && typeof tapeData.backgroundImage == "string") {
        tapeDiv.style.backgroundImage = "url(" + backgroundImage + ")";
        tapeDiv.style.backgroundRepeat = 
            ("backgroundRepeat" in tapeData && typeof tapeData.backgroundRepeat == "string") 
                ? tapeData.backgroundRepeat : 'repeat';
    }
    
    SimileAjax.Graphics.setOpacity(tapeDiv, opacity);
    
    if ("className" in tapeData && typeof tapeData.className == "string") {
        tapeDiv.className += ' ' + tapeData.className;
    }

    this._eventLayer.appendChild(tapeDiv);
    
    return {
        left:   startPixel,
        top:    top,
        width:  width,
        height: height,
        elmt:   tapeDiv
    };
}

Timeline.CompactEventPainter.prototype._createHighlightDiv = function(highlightIndex, dimensions, theme) {
    if (highlightIndex >= 0) {
        var doc = this._timeline.getDocument();
        var eventTheme = theme.event;
        
        var color = eventTheme.highlightColors[Math.min(highlightIndex, eventTheme.highlightColors.length - 1)];
        
        var div = doc.createElement("div");
        div.style.position = "absolute";
        div.style.overflow = "hidden";
        div.style.left =    (dimensions.left - 2) + "px";
        div.style.width =   (dimensions.width + 4) + "px";
        div.style.top =     (dimensions.top - 2) + "px";
        div.style.height =  (dimensions.height + 4) + "px";
//        div.style.background = color;
        
        this._highlightLayer.appendChild(div);
    }
};

Timeline.CompactEventPainter.prototype._onClickMultiplePreciseInstantEvent = function(icon, domEvt, events) {
    var c = SimileAjax.DOM.getPageCoordinates(icon);
    this._showBubble(
        c.left + Math.ceil(icon.offsetWidth / 2), 
        c.top + Math.ceil(icon.offsetHeight / 2),
        events
    );
    
    var ids = [];
    for (var i = 0; i < events.length; i++) {
        ids.push(events[i].getID());
    }
    this._fireOnSelect(ids);
    
    domEvt.cancelBubble = true;
    SimileAjax.DOM.cancelEvent(domEvt);
    
    return false;
};

Timeline.CompactEventPainter.prototype._onClickInstantEvent = function(icon, domEvt, evt) {
    var c = SimileAjax.DOM.getPageCoordinates(icon);
    this._showBubble(
        c.left + Math.ceil(icon.offsetWidth / 2), 
        c.top + Math.ceil(icon.offsetHeight / 2),
        [evt]
    );
    this._fireOnSelect([evt.getID()]);
    
    domEvt.cancelBubble = true;
    SimileAjax.DOM.cancelEvent(domEvt);
    return false;
};

Timeline.CompactEventPainter.prototype._onClickDurationEvent = function(target, domEvt, evt) {
    if ("pageX" in domEvt) {
        var x = domEvt.pageX;
        var y = domEvt.pageY;
    } else {
        var c = SimileAjax.DOM.getPageCoordinates(target);
        var x = domEvt.offsetX + c.left;
        var y = domEvt.offsetY + c.top;
    }
    this._showBubble(x, y, [evt]);
    this._fireOnSelect([evt.getID()]);
    
    domEvt.cancelBubble = true;
    SimileAjax.DOM.cancelEvent(domEvt);
    return false;
};

Timeline.CompactEventPainter.prototype.showBubble = function(evt) {
    var elmt = this._eventIdToElmt[evt.getID()];
    if (elmt) {
        var c = SimileAjax.DOM.getPageCoordinates(elmt);
        this._showBubble(c.left + elmt.offsetWidth / 2, c.top + elmt.offsetHeight / 2, [evt]);
    }
};

Timeline.CompactEventPainter.prototype._showBubble = function(x, y, evts) {
    var div = document.createElement("div");
    
    evts = ("fillInfoBubble" in evts) ? [evts] : evts;
    for (var i = 0; i < evts.length; i++) {
        var div2 = document.createElement("div");
        div.appendChild(div2);
        
        evts[i].fillInfoBubble(div2, this._params.theme, this._band.getLabeller());
    }
    
    SimileAjax.WindowManager.cancelPopups();
    SimileAjax.Graphics.createBubbleForContentAndPoint(div, x, y, this._params.theme.event.bubble.width);
};

Timeline.CompactEventPainter.prototype._fireOnSelect = function(eventIDs) {
    for (var i = 0; i < this._onSelectListeners.length; i++) {
        this._onSelectListeners[i](eventIDs);
    }
};