72 lines
2.3 KiB
C
72 lines
2.3 KiB
C
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/* 17 july 2014 */
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#include "winapi_windows.h"
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HWND newWidget(LPCWSTR 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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/*
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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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static LRESULT CALLBACK buttonSubProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR id, DWORD_PTR data)
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{
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switch (uMsg) {
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case msgCOMMAND:
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if (HIWORD(wParam) == BN_CLICKED) {
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buttonClicked(data);
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return 0;
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}
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return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
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case WM_NCDESTROY:
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if ((*fv_RemoveWindowSubclass)(hwnd, buttonSubProc, id) == FALSE)
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xpanic("error removing Button subclass (which was for its own event handler)", GetLastError());
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return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
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default:
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return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
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}
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xmissedmsg("Button", "buttonSubProc()", uMsg);
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return 0; /* unreached */
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}
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void setButtonSubclass(HWND hwnd, void *data)
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{
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if ((*fv_SetWindowSubclass)(hwnd, buttonSubProc, 0, (DWORD_PTR) data) == FALSE)
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xpanic("error subclassing Button to give it its own event handler", GetLastError());
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}
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