78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
/* 17 july 2014 */
|
|
|
|
#include "winapi_windows.h"
|
|
#include "_cgo_export.h"
|
|
|
|
HWND newWidget(LPCWSTR class, DWORD style, DWORD extstyle)
|
|
{
|
|
HWND hwnd;
|
|
|
|
hwnd = CreateWindowExW(
|
|
extstyle,
|
|
class, L"",
|
|
style | WS_CHILD | WS_VISIBLE,
|
|
CW_USEDEFAULT, CW_USEDEFAULT,
|
|
CW_USEDEFAULT, CW_USEDEFAULT,
|
|
/*
|
|
the following has the consequence of making the control message-only at first
|
|
this shouldn't cause any problems... hopefully not
|
|
but see the msgwndproc() for caveat info
|
|
also don't use low control IDs as they will conflict with dialog boxes (IDCANCEL, etc.)
|
|
*/
|
|
msgwin, (HMENU) 100, hInstance, NULL);
|
|
if (hwnd == NULL)
|
|
xpanic("error creating control", GetLastError());
|
|
return hwnd;
|
|
}
|
|
|
|
void controlSetParent(HWND control, HWND parent)
|
|
{
|
|
if (SetParent(control, parent) == NULL)
|
|
xpanic("error changing control parent", GetLastError());
|
|
}
|
|
|
|
void controlSetControlFont(HWND which)
|
|
{
|
|
SendMessageW(which, WM_SETFONT, (WPARAM) controlFont, TRUE);
|
|
}
|
|
|
|
/*
|
|
all controls that have events receive the events themselves through subclasses
|
|
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
|
|
*/
|
|
LRESULT forwardCommand(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
|
|
{
|
|
HWND control = (HWND) lParam;
|
|
|
|
/* don't generate an event if the control (if there is one) is unparented (a child of the message-only window) */
|
|
if (control != NULL && IsChild(msgwin, control) == 0)
|
|
return SendMessageW(control, msgCOMMAND, wParam, lParam);
|
|
return DefWindowProcW(hwnd, uMsg, wParam, lParam);
|
|
}
|
|
|
|
static LRESULT CALLBACK buttonSubProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR id, DWORD_PTR data)
|
|
{
|
|
switch (uMsg) {
|
|
case msgCOMMAND:
|
|
if (HIWORD(wParam) == BN_CLICKED) {
|
|
buttonClicked((void *) data);
|
|
return 0;
|
|
}
|
|
return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
|
|
case WM_NCDESTROY:
|
|
if ((*fv_RemoveWindowSubclass)(hwnd, buttonSubProc, id) == FALSE)
|
|
xpanic("error removing Button subclass (which was for its own event handler)", GetLastError());
|
|
return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
|
|
default:
|
|
return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
|
|
}
|
|
xmissedmsg("Button", "buttonSubProc()", uMsg);
|
|
return 0; /* unreached */
|
|
}
|
|
|
|
void setButtonSubclass(HWND hwnd, void *data)
|
|
{
|
|
if ((*fv_SetWindowSubclass)(hwnd, buttonSubProc, 0, (DWORD_PTR) data) == FALSE)
|
|
xpanic("error subclassing Button to give it its own event handler", GetLastError());
|
|
}
|