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/* 17 july 2014 */
#include "winapi_windows.h"
#include "_cgo_export.h"
/*
This could all just be part of Window, but doing so just makes things complex.
In this case, I chose to waste a window handle rather than keep things super complex.
If this is seriously an issue in the future, I can roll it back.
*/
#define containerclass L"gouicontainer"
static LRESULT CALLBACK containerWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
void *data;
RECT r;
HDC dc;
PAINTSTRUCT ps;
HWND parent;
POINT client;
data = (void *) GetWindowLongPtrW(hwnd, GWLP_USERDATA);
if (data == NULL) {
/* the lpParam is available during WM_NCCREATE and WM_CREATE */
if (uMsg == WM_NCCREATE) {
storelpParam(hwnd, lParam);
data = (void *) GetWindowLongPtrW(hwnd, GWLP_USERDATA);
storeContainerHWND(data, hwnd);
}
/* act as if we're not ready yet, even during WM_NCCREATE (nothing important to the switch statement below happens here anyway) */
return DefWindowProcW(hwnd, uMsg, wParam, lParam);
}
switch (uMsg) {
case WM_COMMAND:
return forwardCommand(hwnd, uMsg, wParam, lParam);
case WM_NOTIFY:
return forwardNotify(hwnd, uMsg, wParam, lParam);
case WM_PAINT:
#ifndef BROKEN
/* paint the parent's background in a flicker-free way */
dc = BeginPaint(hwnd, &ps);
if (dc == NULL)
abort();//TODO
parent = GetParent(hwnd);
if (parent == NULL)
abort();//TODO
if (GetWindowRect(hwnd, &r) == 0)
abort();//TODO
/* GetWindowRect() returns in screen coordinates; we want parent client */
client.x = r.left;
client.y = r.top;
if (ScreenToClient(parent, &client) == 0)
abort();//TODO
if (SetWindowOrgEx(dc, client.x, client.y, NULL) == 0)
abort();//TODO
SendMessageW(parent, WM_PRINTCLIENT, (WPARAM) dc, PRF_CLIENT);
EndPaint(hwnd, &ps);
return 0;
#else
/* paint the parent's background in a flicker-free way */
dc = BeginPaint(hwnd, &ps);
if (dc == NULL)
abort();//TODO
parent = GetParent(hwnd);
if (parent == NULL)
abort();//TODO
if (GetWindowRect(hwnd, &r) == 0)
abort();//TODO
/* GetWindowRect() returns in screen coordinates; we want parent client */
client.x = r.left;
client.y = r.top;
if (ScreenToClient(parent, &client) == 0)
abort();//TODO
rdc = CreateCompatibleDC(dc);
if (rdc == NULL)
abort();//TODO
rbitmap = CreateCompatibleBitmap(dc, r.right - r.left, r.bottom - r.top);
if (rbitmap == NULL)
abort();//TODO
prevrbitmap = SelectObject(rdc, rbitmap);
if (prevrbitmap == NULL)
abort();//TODO
if (SetWindowOrgEx(rdc, client.x, client.y, NULL) == 0)
abort();//TODO
SendMessageW(parent, WM_PRINTCLIENT, (WPARAM) rdc, PRF_CLIENT);
if (BitBlt(dc, 0, 0, (int) (r.right - r.left), (int) (r.bottom - r.top),
rdc, 0, 0, SRCCOPY) == 0)
abort();//TODO
if (SelectObject(rdc, prevrbitmap) != rbitmap)
abort();//TODO
if (DeleteObject(rbitmap) == 0)
abort();//TODO
if (DeleteDC(rdc) == 0)
abort();//TODO
EndPaint(hwnd, &ps);
return 0;
#endif
case WM_ERASEBKGND:
/* we paint our own background above */
return 1;
case WM_SIZE:
if (GetClientRect(hwnd, &r) == 0)
xpanic("error getting client rect for Window in WM_SIZE", GetLastError());
containerResize(data, &r);
return 0;
default:
return DefWindowProcW(hwnd, uMsg, wParam, lParam);
}
xmissedmsg("container", "containerWndProc()", uMsg);
return 0; /* unreached */
}
DWORD makeContainerWindowClass(char **errmsg)
{
WNDCLASSW wc;
ZeroMemory(&wc, sizeof (WNDCLASSW));
wc.lpfnWndProc = containerWndProc;
wc.hInstance = hInstance;
wc.hIcon = hDefaultIcon;
wc.hCursor = hArrowCursor;
wc.hbrBackground = NULL; /* we paint our own background */
wc.lpszClassName = containerclass;
if (RegisterClassW(&wc) == 0) {
*errmsg = "error registering container window class";
return GetLastError();
}
return 0;
}
HWND newContainer(void *data)
{
HWND hwnd;
hwnd = CreateWindowExW(
WS_EX_TRANSPARENT,
containerclass, L"",
WS_CHILD | WS_VISIBLE,
CW_USEDEFAULT, CW_USEDEFAULT,
100, 100,
msgwin, NULL, hInstance, data);
if (hwnd == NULL)
xpanic("container creation failed", GetLastError());
return hwnd;
}
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