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First pass at external image support

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A bunch of little changes that together enable external image support.
Try:

```
tiddlywiki editions/tw5.com --verbose --build externalimages
```

Then open `externalimages.html`, look for the images in the more/types
tab of the sidebar, open them and verify that they are set with an
external SRC attribute, not a data URI.
This commit is contained in:
Jermolene
2014-06-12 08:36:30 +01:00
parent f131c37893
commit 9547a1f01c
8 changed files with 147 additions and 20 deletions
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10
editions/tw5.com/tiddlers/widgets/ImageWidget.tid
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@@ -1,6 +1,6 @@
title: ImageWidget
created: 20140416160234142
modified: 20140416160234142
modified: 20140611160234142
tags: widget
! Introduction
@@ -18,3 +18,11 @@ Any content of the `<$image>` widget is ignored.
|tooltip |The tooltip to be displayed over the image |
|class |CSS classes to be assigned to the `<img>` element |
! External Images and the ''_canonical_uri'' field
When used to display tiddler-based images, the image widget operates in two distinct modes:
* If the ''_canonical_uri'' field is present then it is used as the ''src'' attribute of the generated `<img>` element and the ''text'' field is ignored
* Without the ''_canonical_uri'' field, the image widget generates an `<img>` element that embeds the image data directly using a `data:` URI.
See ExternalImages for more details.