123 lines
3.3 KiB
C++
123 lines
3.3 KiB
C++
// 6 april 2015
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#include "uipriv_windows.hpp"
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// this is a helper function that takes the logic of determining window classes and puts it all in one place
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// there are a number of places where we need to know what window class an arbitrary handle has
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// theoretically we could use the class atom to avoid a _wcsicmp()
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// however, raymond chen advises against this - http://blogs.msdn.com/b/oldnewthing/archive/2004/10/11/240744.aspx (and we're not in control of the Tab class, before you say anything)
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// usage: windowClassOf(hwnd, L"class 1", L"class 2", ..., NULL)
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int windowClassOf(HWND hwnd, ...)
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{
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// MSDN says 256 is the maximum length of a class name; add a few characters just to be safe (because it doesn't say whether this includes the terminating null character)
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#define maxClassName 260
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WCHAR classname[maxClassName + 1];
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va_list ap;
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WCHAR *curname;
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int i;
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if (GetClassNameW(hwnd, classname, maxClassName) == 0) {
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logLastError(L"error getting name of window class");
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// assume no match on error, just to be safe
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return -1;
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}
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va_start(ap, hwnd);
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i = 0;
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for (;;) {
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curname = va_arg(ap, WCHAR *);
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if (curname == NULL)
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break;
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if (_wcsicmp(classname, curname) == 0) {
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va_end(ap);
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return i;
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}
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i++;
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}
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// no match
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va_end(ap);
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return -1;
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}
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// wrapper around MapWindowRect() that handles the complex error handling
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void mapWindowRect(HWND from, HWND to, RECT *r)
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{
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RECT prevr;
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DWORD le;
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prevr = *r;
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SetLastError(0);
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if (MapWindowRect(from, to, r) == 0) {
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le = GetLastError();
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SetLastError(le); // just to be safe
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if (le != 0) {
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logLastError(L"error calling MapWindowRect()");
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// restore original rect on error, just in case
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*r = prevr;
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}
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}
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}
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DWORD getStyle(HWND hwnd)
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{
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return (DWORD) GetWindowLongPtrW(hwnd, GWL_STYLE);
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}
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void setStyle(HWND hwnd, DWORD style)
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{
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SetWindowLongPtrW(hwnd, GWL_STYLE, (LONG_PTR) style);
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}
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DWORD getExStyle(HWND hwnd)
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{
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return (DWORD) GetWindowLongPtrW(hwnd, GWL_EXSTYLE);
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}
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void setExStyle(HWND hwnd, DWORD exstyle)
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{
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SetWindowLongPtrW(hwnd, GWL_EXSTYLE, (LONG_PTR) exstyle);
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}
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// see http://blogs.msdn.com/b/oldnewthing/archive/2003/09/11/54885.aspx and http://blogs.msdn.com/b/oldnewthing/archive/2003/09/13/54917.aspx
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void clientSizeToWindowSize(HWND hwnd, intmax_t *width, intmax_t *height, BOOL hasMenubar)
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{
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RECT window;
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window.left = 0;
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window.top = 0;
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window.right = *width;
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window.bottom = *height;
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if (AdjustWindowRectEx(&window, getStyle(hwnd), hasMenubar, getExStyle(hwnd)) == 0) {
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logLastError(L"error getting adjusted window rect");
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// on error, don't give up; the window will be smaller but whatever
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window.left = 0;
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window.top = 0;
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window.right = *width;
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window.bottom = *height;
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}
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if (hasMenubar) {
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RECT temp;
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temp = window;
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temp.bottom = 0x7FFF; // infinite height
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SendMessageW(hwnd, WM_NCCALCSIZE, (WPARAM) FALSE, (LPARAM) (&temp));
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window.bottom += temp.top;
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}
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*width = window.right - window.left;
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*height = window.bottom - window.top;
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}
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HWND parentOf(HWND child)
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{
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return GetAncestor(child, GA_PARENT);
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}
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HWND parentToplevel(HWND child)
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{
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return GetAncestor(child, GA_ROOT);
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}
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void setWindowInsertAfter(HWND hwnd, HWND insertAfter)
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{
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if (SetWindowPos(hwnd, insertAfter, 0, 0, 0, 0, SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOOWNERZORDER | SWP_NOSIZE) == 0)
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logLastError(L"error reordering window");
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}
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