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2013-04-15T23:12:20.857
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2013-04-15T23:42:45.013
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2013-04-15T23:42:45.013
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<h1>Thumbnail to Full Image</h1> <p>Make UrlBut create and store a thumbnail when it is instantiated. You can do this with <a href="http://www.pythonware.com/products/pil/" rel="nofollow"><code>PIL</code></a>, follow this tutorial <a href="http://andrius.miasnikovas.lt/2010/04/creating-thumbnails-from-photos-with-python-pil/" rel="nofollow">http://andrius.miasnikovas.lt/2010/04/creating-thumbnails-from-photos-with-python-pil/</a> </p> <p>Then, have the <code>on_press</code> method (or equivalent) create a pop-up or overlay that contains the full size image. </p> <h1>Treating the UrlBut as a Widget</h1> <p>Read this: <a href="http://kivy.org/docs/api-kivy.lang.html#syntax-of-template" rel="nofollow">http://kivy.org/docs/api-kivy.lang.html#syntax-of-template</a></p> <p>The Kivy docs say that a template defined in the kv file may be instantiated within your Python code like this (I am adapting the example given at that link):</p> <p>Your kv language template:</p> <pre><code>[UrlBut@ButtonBehavior+AsyncImage]: source: ctx.source button_grab: True on_press: eval(ctx.on_press) </code></pre> <p>Then in Python, you can instantiate the template with:</p> <pre><code>from kivy.lang import Builder urlbut1 = Builder.template('UrlBut',source='http://lorempixel.com/400/200') # create a second template with a different image urlbut2 = Builder.template('UrlBut', source='http://lorempixel.com/400/200') # and use urlbut1 and urlbut2 as other widgets. </code></pre> <p>Then, you could automate this with a for-loop:</p> <pre><code>for image_path in image_set: layout.add_widget(Builder.template('UrlBut',source="http://www.example/"'%s' % image_path) </code></pre>
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