WindowDeferrer.cpp
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WindowDeferrer.cpp
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	#include "WindowDeferrer.h"

	WindowDeferrer::WindowDeferrer(HWND parent, const Deferrable* deferrables, size_t count) : parent(parent), deferrables(deferrables), count(count)
	{
	hdwp = BeginDeferWindowPos(count);
	}

	WindowDeferrer::~WindowDeferrer()
	{
	EndDeferWindowPos(hdwp);
	}

	bool WindowDeferrer::defer(int deltaX, int deltaY, HWND after)
	{
	for(size_t i = 0; i < count; i++)
	{
	RECT rectControl;
	HWND control = GetDlgItem(parent, deferrables[i].id);

	GetWindowRect(control, &rectControl); // Why doesn't GetClientRect work?
	MapWindowPoints(HWND_DESKTOP, parent, (POINT*)&rectControl, 2);

	int x = rectControl.left;
	int y = rectControl.top;

	// calculate new width and height
	int cx = rectControl.right - rectControl.left;
	int cy = rectControl.bottom - rectControl.top;

	if(deferrables[i].moveX)
	x += deltaX;
	if(deferrables[i].moveY)
	y += deltaY;
	if(deferrables[i].resizeX)
	cx += deltaX;
	if(deferrables[i].resizeY)
	cy += deltaY;

	hdwp = DeferWindowPos(hdwp, control, after, x, y, cx, cy, (after ? 0 : SWP_NOZORDER) \| SWP_NOACTIVATE \| SWP_NOOWNERZORDER);
	}
	return true;
	}