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#include <utility>
#include <string>
#include <string_view>
#include <windows.h>
#include <wininet.h>
#include "err.h"
#include "util.h"
#include "win32.h"
#include "window.h"
static thread_local const wchar_t* s_action;
std::wstring WideFromNarrow(const std::string_view src, const int cp)
{
int cchNarrow = src.length()+1;
int cchWide = MultiByteToWideChar(cp, 0, src.data(), cchNarrow, nullptr, 0);
std::wstring dst(cchWide, 0);
if (!MultiByteToWideChar(cp, 0, src.data(), cchNarrow, dst.data(), cchWide))
throw Err(WINDOWS, L"Narrow string could not be converted to wide string: %s.");
return dst;
}
void WithNextWindow(void (*proc)(HWND))
{
/* WithNextWindow uses a CBT hook to call an arbitrary
* procedure just before the creation of the next window. The
* hook is removed as soon as HCBT_CREATEWND is received.
* Thus, proc is guaranteed to be executed only once. Note
* that static storage must be used, as SetWindowHookEx cannot
* accept a capturing lambda as the hook procedure. */
static thread_local void (*procNext)(HWND);
static thread_local HHOOK hHook;
static const auto procCBT = [](const int nCode,
const WPARAM wParam, const LPARAM lParam) -> LRESULT CALLBACK
{
if (nCode == HCBT_CREATEWND) {
if (!UnhookWindowsHookEx(hHook))
throw Err(WINDOWS, L"Window hook could not be removed: %s.");
procNext(reinterpret_cast<HWND>(wParam));
return 0;
} else
return CallNextHookEx(0, nCode, wParam, lParam);
};
procNext = proc;
if (!(hHook = SetWindowsHookExW(WH_CBT, procCBT, nullptr, GetCurrentThreadId())))
throw Err(WINDOWS, L"Window hook could not be set: %s.");
}
/* Display next created window in the center of given window. */
static void CenterNextWindow(HWND hWnd)
{
if (!hWnd)
return;
/* CenterNextWindow employs a trick similar to that above.
* Note, however, that repositioning does not work unless it
* is delayed until the new window is activated. This
* complicates the code somewhat. */
static thread_local HWND hWndParent;
static thread_local HWND hWndNext;
static thread_local HHOOK hHook;
static const auto procCBT = [](const int nCode,
const WPARAM wParam, const LPARAM lParam) -> LRESULT CALLBACK
{
if (!hWndNext && nCode == HCBT_CREATEWND) {
hWndNext = reinterpret_cast<HWND>(wParam);
return 0;
} else if (nCode == HCBT_ACTIVATE
&& reinterpret_cast<HWND>(wParam) == hWndNext) {
if (!UnhookWindowsHookEx(hHook))
throw Err(WINDOWS, L"Window hook could not be removed: %s.");
long lStyle = GetWindowLongW(hWndNext, GWL_STYLE);
if (!(lStyle & WS_POPUP)) return 0;
RECT rcMain, rcMsg;
GetWindowRect(hWndParent, &rcMain);
GetWindowRect(hWndNext, &rcMsg);
SetWindowPos(hWndNext, nullptr,
rcMain.left+(rcMain.right-rcMain.left)/2-(rcMsg.right-rcMsg.left)/2,
rcMain.top+(rcMain.bottom-rcMain.top)/2-(rcMsg.bottom-rcMsg.top)/2,
-1, -1,
SWP_NOZORDER|SWP_NOSIZE|SWP_NOACTIVATE);
return 0;
} else
return CallNextHookEx(0, nCode, wParam, lParam);
};
hWndParent = hWnd;
hWndNext = nullptr;
if (!(hHook = SetWindowsHookExW(WH_CBT, procCBT, nullptr, GetCurrentThreadId())))
throw Err(WINDOWS, L"Window hook could not be set: %s.");
}
int EBMessageBox(const std::wstring_view text, const std::wstring_view caption, const UINT uType)
{
extern Window* g_window;
const HWND hWnd = g_window? g_window->hWnd: nullptr;
CenterNextWindow(hWnd);
return MessageBox(hWnd, text.data(), caption.data(), uType);
}
int GetRelativeCursorPos(const HWND hWnd, POINT* const pt) noexcept
{
RECT rc;
if (!GetClientRect(hWnd, &rc)) return 0;
SetLastError(ERROR_SUCCESS);
if (!MapWindowPoints(hWnd, nullptr, (POINT*)&rc, 2)) return 0;
POINT ptMouse;
if (!GetCursorPos(&ptMouse)) return 0;
pt->x = ptMouse.x-rc.left;
pt->y = ptMouse.y-rc.top;
return 1;
}
std::optional<Library> Library::Maybe(const wchar_t* const lib) noexcept
{
HMODULE hModule = LoadLibraryW(lib);
if (!hModule) return {};
return Library(hModule);
}
Library::Library(const HMODULE hModule) noexcept
: m_hModule(hModule) {}
Library::Library(const wchar_t* const lib)
{
m_hModule = LoadLibraryW(lib);
if (!m_hModule)
throw Err(WINDOWS, L"Library "s + lib + L" could not be loaded: %s.");
}
Library::~Library()
{
FreeLibrary(m_hModule);
}
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