90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
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/* 17 july 2014 */
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#include "winapi_windows.h"
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#include "_cgo_export.h"
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HWND newControl(LPWSTR class, DWORD style, DWORD extstyle)
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{
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HWND hwnd;
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hwnd = CreateWindowExW(
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extstyle,
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class, L"",
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style | WS_CHILD | WS_VISIBLE,
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CW_USEDEFAULT, CW_USEDEFAULT,
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CW_USEDEFAULT, CW_USEDEFAULT,
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/*
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the following has the consequence of making the control message-only at first
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this shouldn't cause any problems... hopefully not
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but see the msgwndproc() for caveat info
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also don't use low control IDs as they will conflict with dialog boxes (IDCANCEL, etc.)
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*/
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msgwin, (HMENU) 100, hInstance, NULL);
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if (hwnd == NULL)
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xpanic("error creating control", GetLastError());
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return hwnd;
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}
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void controlSetParent(HWND control, HWND parent)
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{
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if (SetParent(control, parent) == NULL)
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xpanic("error changing control parent", GetLastError());
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}
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void controlSetControlFont(HWND which)
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{
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SendMessageW(which, WM_SETFONT, (WPARAM) controlFont, TRUE);
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}
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/*
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all controls that have events receive the events themselves through subclasses
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to do this, all windows (including the message-only window; see http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q104069) forward WM_COMMAND to each control with this function
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*/
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LRESULT forwardCommand(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
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{
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HWND control = (HWND) lParam;
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/* don't generate an event if the control (if there is one) is unparented (a child of the message-only window) */
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if (control != NULL && IsChild(msgwin, control) == 0)
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return SendMessageW(control, msgCOMMAND, wParam, lParam);
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return DefWindowProcW(hwnd, uMsg, wParam, lParam);
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}
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LRESULT forwardNotify(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
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{
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NMHDR *nmhdr = (NMHDR *) lParam;
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HWND control = nmhdr->hwndFrom;
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/* don't generate an event if the control (if there is one) is unparented (a child of the message-only window) */
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if (control != NULL && IsChild(msgwin, control) == 0)
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return SendMessageW(control, msgNOTIFY, wParam, lParam);
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return DefWindowProcW(hwnd, uMsg, wParam, lParam);
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}
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void moveWindow(HWND hwnd, int x, int y, int width, int height)
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{
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if (MoveWindow(hwnd, x, y, width, height, TRUE) == 0)
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xpanic("error setting window/control rect", GetLastError());
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}
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LONG controlTextLength(HWND hwnd, LPWSTR text)
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{
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HDC dc;
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HFONT prev;
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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 of control for text length", GetLastError());
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prev = SelectObject(dc, controlFont);
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if (prev == NULL)
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xpanic("error setting control font to DC for text length", GetLastError());
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if (GetTextExtentPoint32W(dc, text, wcslen(text), &size) == 0)
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xpanic("error actually getting text length", GetLastError());
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if (SelectObject(dc, prev) != controlFont)
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xpanic("error restoring previous control font to DC for text length", GetLastError());
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if (ReleaseDC(hwnd, dc) == 0)
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xpanic("error releasing DC of control for text length", GetLastError());
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return size.cx;
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}
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