Resized Windows
Windows changes the size of a window when the user chooses window menu
commands, such as Size and Maximize, or when the application calls functions, such as
the
SetWindowPos function. When a window changes size, Windows assumes that the contents of
the previously exposed portion of the window are not affected and need not be
redrawn. Windows invalidates only the newly exposed portion of the window, which
saves time when the eventual
WM_PAINT message is processed by the application. In this case, WM_PAINT is not
generated when the size of the window is reduced.
For some windows, any change to the size of the window invalidates the
contents. For example, a clock application that adapts the face of the clock to fit
neatly within its window must redraw the clock whenever the window changes size.
To force Windows to invalidate the entire client area of the window when a
vertical, horizontal, or both vertical and horizontal change is made, an
application must specify the CS_VREDRAW or CS_HREDRAW style, or both, when registering
the window class. Any window belonging to a window class having these styles is
invalidated each time the user or the application changes the size of the
window.
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