SftButton/DLL 3.0 - Button Control

Auto-Sizing

SftButton can automatically resize itself to fit its text and images, re-anchoring to one of nine reference points on its original bounding rectangle. Set iAutoSize on SFTBUTTON_CONTROL to opt in.

Anchor values

Value	Anchor point	Button grows toward
SFTBUTTON_AUTOSIZE_NONE (0)	- (disabled)	-
SFTBUTTON_AUTOSIZE_TOPLEFT	Top-left corner	Right and down
SFTBUTTON_AUTOSIZE_TOPRIGHT	Top-right corner	Left and down
SFTBUTTON_AUTOSIZE_BOTTOMLEFT	Bottom-left corner	Right and up
SFTBUTTON_AUTOSIZE_BOTTOMRIGHT	Bottom-right corner	Left and up
SFTBUTTON_AUTOSIZE_TOPCENTER	Top edge, horizontally centered	Down, growing symmetrically from center
SFTBUTTON_AUTOSIZE_BOTTOMCENTER	Bottom edge, horizontally centered	Up, growing symmetrically from center
SFTBUTTON_AUTOSIZE_LEFTCENTER	Left edge, vertically centered	Right, growing symmetrically from center
SFTBUTTON_AUTOSIZE_RIGHTCENTER	Right edge, vertically centered	Left, growing symmetrically from center
SFTBUTTON_AUTOSIZE_CENTER	Original center	Symmetrically in all directions

The original bounding rectangle is recorded at the moment SFTBUTTON_AUTOSIZE is first set. Subsequent text, image and border changes recompute the optimal size and reposition the button relative to the recorded anchor.

SftButton_CalcOptimalSize

SftButton_CalcOptimalSize returns the optimal width and height without actually resizing the button. Useful for laying out the parent dialog before creating the button, or for computing the size of a future button given candidate text / image content.

Interaction with parent-driven resize

If the parent repositions the button (MoveWindow / SetWindowPos), the anchor is updated to match the new rectangle.

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