103 lines
3.4 KiB
C
103 lines
3.4 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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LRESULT getWindowTextLen(HWND hwnd)
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{
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return SendMessageW(hwnd, WM_GETTEXTLENGTH, 0, 0);
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}
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void getWindowText(HWND hwnd, WPARAM n, LPWSTR buf)
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{
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SetLastError(0);
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if (SendMessageW(hwnd, WM_GETTEXT, n + 1, (LPARAM) buf) != (LRESULT) n)
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xpanic("WM_GETTEXT did not copy the correct number of characters out", GetLastError());
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}
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void setWindowText(HWND hwnd, LPWSTR text)
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{
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switch (SendMessageW(hwnd, WM_SETTEXT, 0, (LPARAM) text)) {
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case FALSE:
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xpanic("WM_SETTEXT failed", GetLastError());
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}
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}
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void updateWindow(HWND hwnd)
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{
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if (UpdateWindow(hwnd) == 0)
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xpanic("error calling UpdateWindow()", GetLastError());
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}
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void *getWindowData(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam, LRESULT *lResult, void (*storeHWND)(void *, HWND))
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{
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CREATESTRUCTW *cs = (CREATESTRUCTW *) lParam;
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void *data;
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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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SetWindowLongPtrW(hwnd, GWLP_USERDATA, (LONG_PTR) (cs->lpCreateParams));
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data = (void *) GetWindowLongPtrW(hwnd, GWLP_USERDATA);
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(*storeHWND)(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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*lResult = DefWindowProcW(hwnd, uMsg, wParam, lParam);
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}
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return data;
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}
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/*
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all container windows (including the message-only window, hence this is not in container_windows.c) have to call the sharedWndProc() to ensure messages go in the right place and control colors are handled properly
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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 container 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, WM_NOTIFY with forwardNotify, etc.
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*/
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static 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 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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BOOL sharedWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam, LRESULT *lResult)
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{
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DWORD exstyle;
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switch (uMsg) {
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case WM_COMMAND:
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*lResult = forwardCommand(hwnd, uMsg, wParam, lParam);
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return TRUE;
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case WM_NOTIFY:
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*lResult = forwardNotify(hwnd, uMsg, wParam, lParam);
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return TRUE;
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case WM_CTLCOLORSTATIC:
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exstyle = (DWORD) GetWindowLongPtrW((HWND) lParam, GWL_EXSTYLE);
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if ((exstyle & WS_EX_TRANSPARENT) != 0) {
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if (SetBkMode((HDC) wParam, TRANSPARENT) == 0)
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xpanic("error setting transparent background mode to Labels", GetLastError());
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*lResult = (LRESULT) hollowBrush;
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return TRUE;
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}
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return FALSE;
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}
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return FALSE;
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}
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