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[Imagery] Only display images when loaded

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Wait until image telemetry is completely loaded before
displaying it, WTD-1170.
This commit is contained in:
Victor Woeltjen
2015-06-17 20:12:04 -07:00
parent 0cb439df19
commit 5a4a912f79
4 changed files with 99 additions and 54 deletions
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89
platform/features/imagery/src/directives/MCTBackgroundImage.js Normal file
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/*****************************************************************************
* Open MCT Web, Copyright (c) 2014-2015, United States Government
* as represented by the Administrator of the National Aeronautics and Space
* Administration. All rights reserved.
*
* Open MCT Web is licensed under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0.
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
* Open MCT Web includes source code licensed under additional open source
* licenses. See the Open Source Licenses file (LICENSES.md) included with
* this source code distribution or the Licensing information page available
* at runtime from the About dialog for additional information.
*****************************************************************************/
/*global define*/
define(
function () {
"use strict";
/**
* Defines the `mct-background-image` directive.
*
* Used as an attribute, this will set the `background-image`
* property to the URL given in its value, but only after that
* image has loaded; this avoids "flashing" as images change.
*
* If `src` is falsy, no image will be displayed (immediately.)
*
*/
function MCTBackgroundImage($document) {
function link(scope, element, attrs) {
// General strategy here:
// - Keep count of how many images have been requested; this
// counter will be used as an internal identifier or sorts
// for each image that loads.
// - As the src attribute changes, begin loading those images.
// - When images do load, update the background-image property
// of the element, but only if a more recently
// requested image has not already been loaded.
// The order in which URLs are passed in and the order
// in which images are actually loaded may be different, so
// some strategy like this is necessary to ensure that images
// do not display out-of-order.
var div, requested = 0, loaded = 0;
function nextImage(url) {
var myCounter = requested,
image;
function useImage() {
if (loaded <= myCounter) {
loaded = myCounter;
element.css('background-image', "url('" + url + "')");
}
}
if (!url) {
loaded = myCounter;
element.css('background-image', undefined);
} else {
image = $document[0].createElement('img');
image.src = url;
image.onload = useImage;
}
requested += 1;
}
scope.$watch('mctBackgroundImage', nextImage);
}
return {
restrict: "A",
scope: { mctBackgroundImage: "=" },
link: link
};
}
return MCTBackgroundImage;
}
);

53
platform/features/imagery/src/directives/MCTImage.js
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/*****************************************************************************
* Open MCT Web, Copyright (c) 2014-2015, United States Government
* as represented by the Administrator of the National Aeronautics and Space
* Administration. All rights reserved.
*
* Open MCT Web is licensed under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0.
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
* Open MCT Web includes source code licensed under additional open source
* licenses. See the Open Source Licenses file (LICENSES.md) included with
* this source code distribution or the Licensing information page available
* at runtime from the About dialog for additional information.
*****************************************************************************/
/*global define*/
define(
function () {
"use strict";
/**
* Defines the `mct-image` directive.
*
* This takes one attribute, `src`, whose value is an Angular
* expression that resolves to an image.
*
* If `src` is falsy, no image will be displayed (immediately.)
*
*/
function MCTImage() {
function link(scope, element, attrs) {
var div;
// Add a div
element.html('<div></div>');
div = element.children().eq(0);
}
return {
scope: { src: "=" },
link: link
};
}
}
);