Dev Blogs
Explorer does it. Now you can too. It's a simple matter of detecting a context menu on the caption icon and displaying a custom context menu. Here are the simple changes to our scratch program to display a rather pointless one-item menu. When we receive a message, we check that...
When you are writing a sort comparison function (say, to be passed to or *gasp* to be used as an ), your comparison function needs to follow these rules: Reflexivity: . Anti-Symmetry: has the opposite sign of , where 0 is considered to be its own opposite. Transitivity: If and , then . Here are some logical consequences of these rules (all ...
The IsDialogMessage function works even if you aren't a dialog. As long as your child windows have the WS_TABSTOP and/or WS_GROUP styles, they can be navigated as if they were part of a dialog box. One caveat is that IsDialogMessage will send DM_GETDEFID and DM_SETDEFID messages to your window, which are messag...
Reader Jeff Miller added Word-style scroll tips to our sample scrollbar program. Here's how he did it: A tracking tooltip is used to display the scroll tip because we don't want the tooltip to do automatic positioning or automatic show/hide. When a tracking scroll occurs (), we ...
If the program starts with the mouse already in the client area without moving, why do you get a beep?
There is a message. Why isn't there a message? Because you can easily figure that out for yourself. When you receive a message, set a flag that says, "The mouse is outside the window." When you receive a message and the flag is set, then the mouse has entered the window. (And cle...
Bitmap brushes used to be these little 8x8 monochrome patterns that you could use for hatching and maybe little houndstooth patterns if you were really crazy. But you can do better. CreatePatternBrush lets you pass in any old bitmap - even a huge one, and it will create a brush from it. The bi...
Shared memory is not just for sharing memory with other processes. It also lets you share memory with yourself in sneaky ways. For example, this sample program (all error checking and cleanup deleted for expository purposes) shows how you can map the same shared memory into two locations simultaneousl...
In order to understand this properly, it helps to know where messages come from. When the hardware mouse reports an interrupt, indicating that the physical mouse has moved, Windows determines which thread should receive the mouse move message and sets a flag on that thread's input queue that...
Okay, that's basically the end of the scrollbar series. Do people actually like the idea of a coding series? It gets very few comments, and it's a lot of work to write, so if nobody actually cares I can just write about quick little things and not try to be coherent from day to day. I guess that's what most blogs are like anyway. If you like th...