I just started creating a widget. I've read the Quick Start Guide, and found that the following images are used by a widget: 1. logo.png - used at the top of the sidebar; 2. loading.png - used as a transitional image while dock is loading; 3. placeholder.png - used for view-specific and profile-specific snippet images; 4. icon.png - used for the widget gallery, on about page, and other OEM-specific contexts.
What I haven't found is the size these images must have. Except for the icon.png which must be 44x44 pixels, I have no idea for the others... Please guide me to where I can find this information. Also it is not clear to me which image will appear on my application's snippet view, I suppose it's the placeholder.png file?