nếu bạn nhìn colors.js tập tin của thư viện tài liệu góc cạnh, bạn sẽ khám phá ra rằng có không phải là một lựa chọn mà chúng ta cấu hình tình trạng hiệu lực thi hành di chuột:
/**
* @ngdoc directive
* @name mdColors
* @module material.components.colors
*
* @restrict A
*
* @description
* `mdColors` directive will apply the theme-based color expression as RGBA CSS style values.
*
* The format will be similar to our color defining in the scss files:
*
* ## `[?theme]-[palette]-[?hue]-[?opacity]`
* - [theme] - default value is the default theme
* - [palette] - can be either palette name or primary/accent/warn/background
* - [hue] - default is 500 (hue-x can be used with primary/accent/warn/background)
* - [opacity] - default is 1
*
* > `?` indicates optional parameter
*
* @usage
* <hljs lang="html">
* <div md-colors="{background: 'myTheme-accent-900-0.43'}">
* <div md-colors="{color: 'red-A100', 'border-color': 'primary-600'}">
* <span>Color demo</span>
* </div>
* </div>
* </hljs>
*
* `mdColors` directive will automatically watch for changes in the expression if it recognizes an interpolation
* expression or a function. For performance options, you can use `::` prefix to the `md-colors` expression
* to indicate a one-time data binding.
* <hljs lang="html">
* <md-card md-colors="::{background: '{{theme}}-primary-700'}">
* </md-card>
* </hljs>
*
*/
function MdColorsDirective($mdColors, $mdUtil, $log, $parse) {
return {
restrict: 'A',
require: ['^?mdTheme'],
compile: function (tElem, tAttrs) {
var shouldWatch = shouldColorsWatch();
return function (scope, element, attrs, ctrl) {
var mdThemeController = ctrl[0];
var lastColors = {};
var parseColors = function (theme) {
if (typeof theme !== 'string') {
theme = '';
}
if (!attrs.mdColors) {
attrs.mdColors = '{}';
}
/**
* Json.parse() does not work because the keys are not quoted;
* use $parse to convert to a hash map
*/
var colors = $parse(attrs.mdColors)(scope);
/**
* If mdTheme is defined up the DOM tree
* we add mdTheme theme to colors who doesn't specified a theme
*
* # example
* <hljs lang="html">
* <div md-theme="myTheme">
* <div md-colors="{background: 'primary-600'}">
* <span md-colors="{background: 'mySecondTheme-accent-200'}">Color demo</span>
* </div>
* </div>
* </hljs>
*
* 'primary-600' will be 'myTheme-primary-600',
* but 'mySecondTheme-accent-200' will stay the same cause it has a theme prefix
*/
if (mdThemeController) {
Object.keys(colors).forEach(function (prop) {
var color = colors[prop];
if (!$mdColors.hasTheme(color)) {
colors[prop] = (theme || mdThemeController.$mdTheme) + '-' + color;
}
});
}
cleanElement(colors);
return colors;
};
var cleanElement = function (colors) {
if (!angular.equals(colors, lastColors)) {
var keys = Object.keys(lastColors);
if (lastColors.background && !keys.color) {
keys.push('color');
}
keys.forEach(function (key) {
element.css(key, '');
});
}
lastColors = colors;
};
/**
* Registering for mgTheme changes and asking mdTheme controller run our callback whenever a theme changes
*/
var unregisterChanges = angular.noop;
if (mdThemeController) {
unregisterChanges = mdThemeController.registerChanges(function (theme) {
$mdColors.applyThemeColors(element, parseColors(theme));
});
}
scope.$on('$destroy', function() {
unregisterChanges();
});
try {
if (shouldWatch) {
scope.$watch(parseColors, angular.bind(this,
$mdColors.applyThemeColors, element
), true);
}
else {
$mdColors.applyThemeColors(element, parseColors());
}
}
catch (e) {
$log.error(e.message);
}
};
function shouldColorsWatch() {
// Simulate 1x binding and mark mdColorsWatch == false
var rawColorExpression = tAttrs.mdColors;
var bindOnce = rawColorExpression.indexOf('::') > -1;
var isStatic = bindOnce ? true : STATIC_COLOR_EXPRESSION.test(tAttrs.mdColors);
// Remove it for the postLink...
tAttrs.mdColors = rawColorExpression.replace('::', '');
var hasWatchAttr = angular.isDefined(tAttrs.mdColorsWatch);
return (bindOnce || isStatic) ? false :
hasWatchAttr ? $mdUtil.parseAttributeBoolean(tAttrs.mdColorsWatch) : true;
}
}
};
}
Nguồn
2017-04-06 08:26:09