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Note After running the previous example, try resizing the application s window. Since you used
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percentage-based coordinates, you should see a relative positioning effect as the size of the window varies.
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Shoes has other tools for building layouts. The two most important are stacks and flows, both of which are containers for other elements. Elements within stacks are stacked on top of one another, whereas elements within flows will first flow from left to right before moving down to the next row of the flow.
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If you re familiar with HTML and CSS, think of stacks as being like <div> elements and flows as also Tip
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being like <div> elements, but with all of the sub-elements having a float property of left.
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Flows and stacks are useful when you want to create groups of interface elements that have a relational layout to each other. For example, if you were writing an instant messenger application, each of the messages could be added as a new text element within a stack. If you were building an image gallery app, however, each image thumbnail could be added inside a flow to show the most thumbnails on the screen at once. As we ve only worked with button elements so far, let s see how to use a flow to build up a collection of equally spaced buttons, as if for a calculator application. We want a grid of four-by-four buttons with the numbers and mathematical operators on them. We ll do this by defining a flow of a certain width and height and then adding buttons of the correct width and height to get a grid of buttons four across and four high: Shoes.app(:width => 300, :height => 300) do flow :width => 280 do %w{7 8 9 / 4 5 6 * 1 2 3 + 0 C = -}.each do |key| button key, :width => 70, :height => 70 do alert "You pressed #{key}" end end end end As you can see, a flow is defined similarly to all other blocks in Shoes apps. Just use flow, followed by any options, and then a code block. We define a flow that s 280 pixels wide, and then iterate over an array of 16 characters (0 9, /, *, +, -, =, and C) to create buttons of 70 pixels wide and tall that flow within the flow. The result is shown in Figure 16-3. No height is specified, which means the height will dynamically grow as more items are added within the flow (the same applies to stacks). You can specify a height in the same way as a width, but using the :height argument, if you wish.
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C ha p ter 16 G U I - B a S e D D e S K t O p a p p LI C a t I O N D e V e LO p M e N t
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Figure 16-3. A flow containing 16 buttons
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By default, flows and stacks with a specified height chop content off at that height. You can make Tip them use scrollbars instead by specifying :scroll => true as an argument.
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So far all of our heights and widths have been specified in pixels, but we can also use percentage-based widths and heights on the flow to make the interface totally scalable: Shoes.app(:width => 300, :height => 300) do flow :width => 0.9, :height => 0.8, :margin => 5 do %w{7 8 9 / 4 5 6 * 1 2 3 + 0 C = -}.each do |key| button key, :width => 0.22, :height => 0.22 do alert "You pressed #{key}" end end end end In this case, the app can be resized larger and smaller and the buttons will scale relatively, thanks to the percentage-based sizing of both the flow and the buttons within it. You might also note that a :margin attribute has been introduced. This, rather aptly, adds a margin to any elements you use it on. The previous two examples could have been built without using flows, and instead you could have calculated the correct left and top positions to use for each button, but the flow makes it a lot easier by providing a bounding box for your buttons to work within.
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