Abstract: A group of files are presented on a graphical user interface using a template. The presentation is controlled by a rule associated with the template. A user input for adjusting a layout parameter of a selected file of the group of files is received. In response, the rule is examined and the layout parameter of the selected file is adjusted based on the rule. One or more next files in the group of files are evaluated to determine if the rule is satisfied following adjusting the layout parameter of the selected file. Based on determining that the rule is violated, layout parameters of the one or more next files are recursively adjusted until the rule is satisfied. The presentation of the group of files using the template is updated based on recursively adjusting the layout parameters of the one or more next files.