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How to have a loading bar for ModestMap?
I want have a loading bar for the ModestMap, i tried to write code like this:
var txt:TextField = new TextField();
txt.x = 100;
txt.y = 100;
addChild(txt);
this.loaderInfo.addEventListener(ProgressEvent.PROGRESS,loadingHandler);
function loadingHandler(event:ProgressEvent):void {
var loadInfo:uint = (event.bytesLoaded / event.bytesTotal)*100;
txt.text = String("loading:" + loadInfo + "%");
}
but it does not work, until the load finished, the txt cant be visible, i dont know why.
if i want this bar in flash cs3, how should i do ?
waiting your help, thanks!
var txt:TextField = new TextField();
txt.x = 100;
txt.y = 100;
addChild(txt);
this.loaderInfo.addEventListener(ProgressEvent.PROGRESS,loadingHandler);
function loadingHandler(event:ProgressEvent):void {
var loadInfo:uint = (event.bytesLoaded / event.bytesTotal)*100;
txt.text = String("loading:" + loadInfo + "%");
}
but it does not work, until the load finished, the txt cant be visible, i dont know why.
if i want this bar in flash cs3, how should i do ?
waiting your help, thanks!
I’m confused
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Inappropriate?Do you mean that you want a progress bar for the tiles as they are loaded? Try the following:
var bar:ProgressBar = new mx.controls.ProgressBar();
bar.source = map.grid;
somePanel.addChild(bar);
I had to override the TileGrid's onProgress function to get it to function the way that I wanted.4 Comments
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This answers the question
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What modification did you make? Was something wrong, or was it just to get it working with the Flex ProgessBar? -
It may be a bug or it may have been intentional. The onProgress function seemed to output previousOpenRequests - openRequests out of previousOpenRequests. However, previousOpenRequests gets modified somewhere else during the course of loading tiles, which makes it inaccurate for sending to the progress bar.
Instead, I did the following to calculate the number of images loaded out of the total (this is from memory so the method names may not be quite right):
protected var calcNumTiles:Boolean = true;
protected var numImages:int = 0;
private function onBeginTileLoading():void {
calcNumImages = true;
// rest of method the same
}
private function onProgress():void {
var count:int = 0;
for (var name:String in layersNeeded) {
if (layersNeeded[name]) {
count += layersNeeded[name].length;
}
}
if (calcNumImages) {
numImages = count;
calcNumImages = false;
}
dispatchEvent(new ProgressEvent(ProgressEvent.PROGRESS, false, false, numImages - count, numImages));
} -
Right! Good stuff. Thanks for the speedy response. We're digging around TileGrid quite a bit in the new Google Code repository. It's not currently getting any cleaner, but it really should soon. Watch this space!
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I'll be looking forward to a cleaner TileGrid. It's rather imposing in its current form. I'm running a custom version of it (for the progress event and to give access to visibleTiles and something else that I can't recall). As you are cleaning it up, consider using URLLoader in a binary data form to cache PNG/GIF bytearrays, then using Loader.loadBytes. This should save a good chunk of memory over caching Loaders. I had a version of TileGrid that did this at one point, but ended up scrapping it because while Loader.loadBytes() is great for just showing a tile, it isn't fast enough to animate them.
