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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)
{
LRESULT lResult;
if (sharedWndProc(hwnd, uMsg, wParam, lParam, &lResult))
return lResult;
switch (uMsg) {
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;//(HBRUSH) (COLOR_BTNFACE + 1);
wc.lpszClassName = containerclass;
if (RegisterClassW(&wc) == 0) {
*errmsg = "error registering container window class";
return GetLastError();
}
return 0;
}
HWND newContainer(void)
{
HWND hwnd;
hwnd = CreateWindowExW(
WS_EX_CONTROLPARENT | WS_EX_TRANSPARENT,
containerclass, L"",
WS_CHILD | WS_VISIBLE,
CW_USEDEFAULT, CW_USEDEFAULT,
100, 100,
msgwin, NULL, hInstance, NULL);
if (hwnd == NULL)
xpanic("container creation failed", GetLastError());
return hwnd;
}
void calculateBaseUnits(HWND hwnd, int *baseX, int *baseY, LONG *internalLeading)
{
HDC dc;
HFONT prevFont;
TEXTMETRICW tm;
SIZE size;
dc = GetDC(hwnd);
if (dc == NULL)
xpanic("error getting DC for preferred size calculations", GetLastError());
prevFont = (HFONT) SelectObject(dc, controlFont);
if (prevFont == NULL)
xpanic("error loading control font into device context for preferred size calculation", GetLastError());
if (GetTextMetricsW(dc, &tm) == 0)
xpanic("error getting text metrics for preferred size calculations", GetLastError());
if (GetTextExtentPoint32W(dc, L"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz", 52, &size) == 0)
xpanic("error getting text extent point for preferred size calculations", GetLastError());
*baseX = (int) ((size.cx / 26 + 1) / 2);
*baseY = (int) tm.tmHeight;
*internalLeading = tm.tmInternalLeading;
if (SelectObject(dc, prevFont) != controlFont)
xpanic("error restoring previous font into device context after preferred size calculations", GetLastError());
if (ReleaseDC(hwnd, dc) == 0)
xpanic("error releasing DC for preferred size calculations", GetLastError());
}
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