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Font-family fallback

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This commit is contained in:
vakrilov
2015-06-24 11:39:17 +03:00
parent e1a0e9a016
commit 997dfd1639
4 changed files with 134 additions and 46 deletions
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58
ui/styling/font.android.ts
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@@ -3,6 +3,7 @@ import common = require("ui/styling/font-common");
import application = require("application");
import trace = require("trace");
import types = require("utils/types");
import fs = require("file-system");
var typefaceCache = new Map<string, android.graphics.Typeface>();
var appAssets: android.content.res.AssetManager;
@@ -46,23 +47,37 @@ export class Font extends common.Font {
}
private getTypeFace(fontFamily: string): android.graphics.Typeface {
if (!fontFamily) {
var fonts = common.parseFontFamily(fontFamily);
var result = null;
if (fonts.length === 0) {
return null;
}
switch (fontFamily.toLowerCase()) {
case common.genericFontFamilies.serif:
return android.graphics.Typeface.SERIF;
for (var i = 0; i < fonts.length; i++) {
switch (fonts[i].toLowerCase()) {
case common.genericFontFamilies.serif:
result = android.graphics.Typeface.SERIF;
break;
case common.genericFontFamilies.sansSerif:
return android.graphics.Typeface.SANS_SERIF;
case common.genericFontFamilies.sansSerif:
result = android.graphics.Typeface.SANS_SERIF;
break;
case common.genericFontFamilies.monospace:
return android.graphics.Typeface.MONOSPACE;
case common.genericFontFamilies.monospace:
result = android.graphics.Typeface.MONOSPACE;
break;
default:
return this.loadFontFromAsset(fontFamily);
default:
result = this.loadFontFromAsset(fonts[i]);
break;
}
if (result) {
return result;
}
}
return null;
}
private loadFontFromAsset(fontFamily: string): android.graphics.Typeface {
@@ -75,11 +90,24 @@ export class Font extends common.Font {
// Check for undefined explicitly as null mean we tried to load the font, but failed.
if (types.isUndefined(result)) {
result = null;
var fontAsset = "app/fonts/" + fontFamily + ".ttf";
try {
result = android.graphics.Typeface.createFromAsset(appAssets, fontAsset);
} catch (e) {
trace.write("Cannot find font asset: " + fontAsset, trace.categories.Error, trace.messageType.error);
var fontAssetPath: string;
var basePath = fs.path.join(fs.knownFolders.currentApp().path, "fonts", fontFamily);
if (fs.File.exists(basePath + ".ttf")) {
fontAssetPath = "app/fonts/" + fontFamily + ".ttf";
}
else if (fs.File.exists(basePath + ".otf")) {
fontAssetPath = "app/fonts/" + fontFamily + ".otf";
}
else {
trace.write("Could not find font file for " + fontFamily, trace.categories.Error, trace.messageType.error);
}
if (fontAssetPath){
try {
result = android.graphics.Typeface.createFromAsset(appAssets, fontAssetPath);
} catch (e) {
trace.write("Error loading font asset: " + fontAssetPath, trace.categories.Error, trace.messageType.error);
}
}
typefaceCache.set(fontFamily, result);
}