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Show and hide progress bar per downloads status

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This commit is contained in:
David Rowe 2015-01-29 22:43:45 -08:00
parent 9b6a81cfb0
commit 7beb5bf25f
1 changed files with 88 additions and 10 deletions
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98
examples/progress.js
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@ -14,8 +14,17 @@
(function () {
var progress = 100, // %
alpha = 0.0,
alphaDelta = 0.0, // > 0 if fading in; < 0 if fading out
ALPHA_DELTA_IN = 0.15,
ALPHA_DELTA_OUT = -0.02,
fadeTimer = null,
FADE_INTERVAL = 30, // ms between changes in alpha
fadeWaitTimer = null,
FADE_OUT_WAIT = 1000, // Wait before starting to fade out after progress 100%
visible = false,
BAR_COLOR = { red: 0, green: 128, blue: 0 },
BAR_WIDTH = 320, // Raw dimension in pixels of SVG
BAR_WIDTH = 320, // Nominal dimension of SVG in pixels
BAR_HEIGHT = 20,
BAR_URL = "http://ctrlaltstudio.com/hifi/progress-bar.svg",
BACKGROUND_WIDTH = 360,
@ -27,9 +36,41 @@
windowWidth = 0,
windowHeight = 0;
function updateInfo(info) {
function fade() {
alpha = alpha + alphaDelta;
if (alpha < 0) {
alpha = 0;
}
if (alpha > 1) {
alpha = 1;
}
if (alpha === 0 || alpha === 1) { // Finished fading in or out
alphaDelta = 0;
Script.clearInterval(fadeTimer);
}
if (alpha === 0) { // Finished fading out
visible = false;
}
Overlays.editOverlay(background2D.overlay, {
alpha: alpha,
visible: visible
});
Overlays.editOverlay(bar2D.overlay, {
alpha: alpha,
visible: visible
});
}
function onDownloadInfoChanged(info) {
var i;
// Calculate progress
if (info.downloading.length + info.pending === 0) {
progress = 100;
} else {
@ -40,9 +81,46 @@
progress = progress / (info.downloading.length + info.pending);
}
Overlays.editOverlay(bar2D.overlay, {
width: progress / 100 * bar2D.width
});
// Update state
if (!visible) { // Not visible because no recent downloads
if (progress < 100) { // Have started downloading so fade in
visible = true;
alphaDelta = ALPHA_DELTA_IN;
fadeTimer = Script.setInterval(fade, FADE_INTERVAL);
}
} else if (alphaDelta !== 0.0) { // Fading in or out
if (alphaDelta > 0) {
if (progress === 100) { // Was donloading but now have finished so fade out
alphaDelta = ALPHA_DELTA_OUT;
}
} else {
if (progress < 100) { // Was finished downloading but have resumed so fade in
alphaDelta = ALPHA_DELTA_IN;
}
}
} else { // Fully visible because downloading or recently so
if (fadeWaitTimer === null) {
if (progress === 100) { // Was downloading but have finished so fade out soon
fadeWaitTimer = Script.setTimeout(function () {
alphaDelta = ALPHA_DELTA_OUT;
fadeTimer = Script.setInterval(fade, FADE_INTERVAL);
fadeWaitTimer = null;
}, FADE_OUT_WAIT);
}
} else {
if (progress < 100) { // Was finished and waiting to fade out but have resumed downloading so don't fade out
Script.clearInterval(fadeWaitTimer);
fadeWaitTimer = null;
}
}
}
// Update progress bar
if (visible) {
Overlays.editOverlay(bar2D.overlay, {
width: progress / 100 * bar2D.width
});
}
}
function update() {
@ -73,8 +151,8 @@
width: background2D.width,
height: background2D.height,
imageURL: BACKGROUND_URL,
visible: true,
alpha: 1.0
visible: false,
alpha: 0.0
});
bar2D.width = SCALE_2D * BAR_WIDTH;
@ -84,8 +162,8 @@
height: bar2D.height,
imageURL: BAR_URL,
color: BAR_COLOR,
visible: true,
alpha: 1.0
visible: false,
alpha: 0.0
});
}
@ -95,7 +173,7 @@
}
setUp();
GlobalServices.downloadInfoChanged.connect(updateInfo);
GlobalServices.downloadInfoChanged.connect(onDownloadInfoChanged);
GlobalServices.updateDownloadInfo();
Script.update.connect(update);
Script.scriptEnding.connect(tearDown);