Databases
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    <p>You implement a form designer almost like a normal GUI. You have stuff you can drag (your widgets), you have stuff you can click (your buttons) and you have stuff you can select (your placed widgets) and that's really about it.</p> <hr> <p><strong>Q: Now, how do you display a window in a GUI?</strong><br> A: You paint it, simple as that. </p> <p><strong>Q: And how do you keep stuff inside that window?</strong><br> A: You check against the bounds of the "parent" object. You could almost say that a form designer is like a little game and you have a scene graph holding all your widgets, connected by parent-child-relations. </p> <p><strong>Q: Then, how do you select stuff in a GUI?</strong><br> A: Check the current mouse position on-click against the bounds of all (near) widgets (a scene graph only helps here, like a quadtree). </p> <p><strong>Q: How do you align widgets on a grid?</strong><br> A: For the grid alignment, let's have a simple example: Say your real resolution is <code>100px</code> on the x-axis, but you want your grid to only have a resolution of <code>10px</code> on x. Now say you move your widget by <code>28px</code> in real resolution. To get the grid resolution, you simply divide by <code>10</code>, get <code>2.8</code>, round that, and finally move the widget <code>3</code> tiles on x. The rounding is the key here. only if the grid movement is <code>&gt;= ?.5</code>, you snap to the next tile. Otherwise you simple stay at the old one.</p> <hr> <p>Hope this can give you a general hint on how to start a form designer. Have fun. :)<br> (PS: Don't know about any specific WinAPI/MFC functions/class to help you along, sorry.)</p>
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    1. POCreating a professional-looking (and behaving!) form designer
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    1. COI know I can detect WM_LBUTTONDOWN and WM_LBUTTONUP messages to select objects; and divide, round and multiply back to implement Snap to Grid. I just wondered whether there was an API that made creating "selectable" objects less tedious. Otherwise, I'll have to analyze the "edges" surrounding Office's autoshapes, pixel by pixel, in order to be able to recreate them.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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