111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/* 17 july 2014 */
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#include "winapi_windows.h"
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#include "_cgo_export.h"
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/*
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This could all just be part of Window, but doing so just makes things complex.
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In this case, I chose to waste a window handle rather than keep things super complex.
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If this is seriously an issue in the future, I can roll it back.
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*/
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#define containerclass L"gouicontainer"
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static LRESULT CALLBACK containerWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
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{
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void *data;
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RECT r;
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HDC dc;
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PAINTSTRUCT ps;
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HWND parent;
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POINT client;
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data = (void *) GetWindowLongPtrW(hwnd, GWLP_USERDATA);
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if (data == NULL) {
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/* the lpParam is available during WM_NCCREATE and WM_CREATE */
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if (uMsg == WM_NCCREATE) {
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storelpParam(hwnd, lParam);
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data = (void *) GetWindowLongPtrW(hwnd, GWLP_USERDATA);
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storeContainerHWND(data, hwnd);
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}
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/* act as if we're not ready yet, even during WM_NCCREATE (nothing important to the switch statement below happens here anyway) */
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return DefWindowProcW(hwnd, uMsg, wParam, lParam);
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}
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switch (uMsg) {
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case WM_COMMAND:
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return forwardCommand(hwnd, uMsg, wParam, lParam);
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case WM_NOTIFY:
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return forwardNotify(hwnd, uMsg, wParam, lParam);
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case WM_SIZE:
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if (GetClientRect(hwnd, &r) == 0)
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xpanic("error getting client rect for Window in WM_SIZE", GetLastError());
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containerResize(data, &r);
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return 0;
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default:
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return DefWindowProcW(hwnd, uMsg, wParam, lParam);
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}
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xmissedmsg("container", "containerWndProc()", uMsg);
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return 0; /* unreached */
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}
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DWORD makeContainerWindowClass(char **errmsg)
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{
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WNDCLASSW wc;
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ZeroMemory(&wc, sizeof (WNDCLASSW));
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wc.lpfnWndProc = containerWndProc;
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wc.hInstance = hInstance;
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wc.hIcon = hDefaultIcon;
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wc.hCursor = hArrowCursor;
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wc.hbrBackground = (HBRUSH) (COLOR_BTNFACE + 1);
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wc.lpszClassName = containerclass;
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if (RegisterClassW(&wc) == 0) {
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*errmsg = "error registering container window class";
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return GetLastError();
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}
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return 0;
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}
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HWND newContainer(void *data)
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{
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HWND hwnd;
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hwnd = CreateWindowExW(
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0,
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containerclass, L"",
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WS_CHILD | WS_VISIBLE,
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CW_USEDEFAULT, CW_USEDEFAULT,
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100, 100,
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msgwin, NULL, hInstance, data);
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if (hwnd == NULL)
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xpanic("container creation failed", GetLastError());
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return hwnd;
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}
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void calculateBaseUnits(HWND hwnd, int *baseX, int *baseY, LONG *internalLeading)
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{
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HDC dc;
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HFONT prevFont;
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TEXTMETRICW tm;
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SIZE size;
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dc = GetDC(hwnd);
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if (dc == NULL)
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xpanic("error getting DC for preferred size calculations", GetLastError());
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prevFont = (HFONT) SelectObject(dc, controlFont);
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if (prevFont == NULL)
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xpanic("error loading control font into device context for preferred size calculation", GetLastError());
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if (GetTextMetricsW(dc, &tm) == 0)
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xpanic("error getting text metrics for preferred size calculations", GetLastError());
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if (GetTextExtentPoint32W(dc, L"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz", 52, &size) == 0)
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xpanic("error getting text extent point for preferred size calculations", GetLastError());
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*baseX = (int) ((size.cx / 26 + 1) / 2);
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*baseY = (int) tm.tmHeight;
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*internalLeading = tm.tmInternalLeading;
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if (SelectObject(dc, prevFont) != controlFont)
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xpanic("error restoring previous font into device context after preferred size calculations", GetLastError());
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if (ReleaseDC(hwnd, dc) == 0)
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xpanic("error releasing DC for preferred size calculations", GetLastError());
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}
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