/
defaultcheckstrategy.js
65 lines (58 loc) · 2.55 KB
/
defaultcheckstrategy.js
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/**
* @constructor
*/
webfont.DefaultCheckStrategy = function(sizingElementCreator, activeCallback,
inactiveCallback, fontSizer, fontFamily, fontDescription, opt_fontTestString) {
this.sizingElementCreator_ = sizingElementCreator;
this.activeCallback_ = activeCallback;
this.inactiveCallback_ = inactiveCallback;
this.fontSizer_ = fontSizer;
this.fontFamily_ = fontFamily;
this.fontDescription_ = fontDescription;
this.fontTestString_ = opt_fontTestString
|| webfont.FontWatchRunner.DEFAULT_TEST_STRING;
};
webfont.DefaultCheckStrategy.prototype.setUp = function() {
this.originalSizeA_ = this.getStackSize_(webfont.FontWatchRunner.SANS_STACK);
this.originalSizeB_ = this.getStackSize_(webfont.FontWatchRunner.SERIF_STACK);
this.lastObservedSizeA_ = this.originalSizeA_;
this.lastObservedSizeB_ = this.originalSizeB_;
this.requestedFontA_ = this.sizingElementCreator_.createSizingElement(
this.fontFamily_, webfont.FontWatchRunner.SANS_STACK,
this.fontDescription_, this.fontTestString_);
this.requestedFontB_ = this.sizingElementCreator_.createSizingElement(
this.fontFamily_, webfont.FontWatchRunner.SERIF_STACK,
this.fontDescription_, this.fontTestString_);
};
webfont.DefaultCheckStrategy.prototype.tearDown = function() {
this.sizingElementCreator_.deleteSizingElement(this.requestedFontA_);
this.sizingElementCreator_.deleteSizingElement(this.requestedFontB_);
};
webfont.DefaultCheckStrategy.prototype.isLoaded = function() {
var sizeA = this.fontSizer_.getWidth(this.requestedFontA_);
var sizeB = this.fontSizer_.getWidth(this.requestedFontB_);
if ((this.originalSizeA_ != sizeA || this.originalSizeB_ != sizeB) &&
this.lastObservedSizeA_ == sizeA && this.lastObservedSizeB_ == sizeB) {
return true;
}
this.lastObservedSizeA_ = sizeA;
this.lastObservedSizeB_ = sizeB;
return false;
};
webfont.DefaultCheckStrategy.prototype.getActiveCallback = function() {
return webfont.bind(this, function() {
this.activeCallback_(this.fontFamily_, this.fontDescription_);
});
};
webfont.DefaultCheckStrategy.prototype.getTimeoutCallback = function() {
return webfont.bind(this, function() {
this.inactiveCallback_(this.fontFamily_, this.fontDescription_);
});
};
webfont.DefaultCheckStrategy.prototype.getStackSize_ = function(stack) {
var stackElement = this.sizingElementCreator_.createSizingElement('',
stack, this.fontDescription_, this.fontTestString_);
var size = this.fontSizer_.getWidth(stackElement);
this.sizingElementCreator_.deleteSizingElement(stackElement);
return size;
};