124 lines
3.8 KiB
C
124 lines
3.8 KiB
C
// 25 july 2014
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#include "winapi_windows.h"
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#include "_cgo_export.h"
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// provided for cgo's benefit
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LPWSTR xWC_TABCONTROL = WC_TABCONTROL;
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static LRESULT CALLBACK tabSubProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR id, DWORD_PTR data)
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{
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NMHDR *nmhdr = (NMHDR *) lParam;
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LRESULT lResult, r;
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RECT resizeRect;
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WINDOWPOS *wp;
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if (sharedWndProc(hwnd, uMsg, wParam, lParam, &lResult))
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return lResult;
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switch (uMsg) {
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case msgNOTIFY:
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switch (nmhdr->code) {
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case TCN_SELCHANGING:
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r = SendMessageW(hwnd, TCM_GETCURSEL, 0, 0);
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if (r == (LRESULT) -1) // no tab currently selected
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return FALSE;
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tabChanging((void *) data, r);
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return FALSE; // allow change
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case TCN_SELCHANGE:
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tabChanged((void *) data, SendMessageW(hwnd, TCM_GETCURSEL, 0, 0));
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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 msgTabCurrentTabHasChildren:
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return (LRESULT) tabTabHasChildren((void *) data, SendMessageW(hwnd, TCM_GETCURSEL, 0, 0));
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case WM_WINDOWPOSCHANGING:
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case WM_WINDOWPOSCHANGED:
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wp = (WINDOWPOS *) lParam;
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resizeRect.left = wp->x;
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resizeRect.top = wp->y;
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resizeRect.right = wp->x + wp->cx;
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resizeRect.bottom = wp->y + wp->cy;
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tabGetContentRect(hwnd, &resizeRect);
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tabResized((void *) data, resizeRect);
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// and chain up
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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, tabSubProc, id) == FALSE)
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xpanic("error removing Tab 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("Tab", "tabSubProc()", uMsg);
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return 0; // unreached
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}
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void setTabSubclass(HWND hwnd, void *data)
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{
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if ((*fv_SetWindowSubclass)(hwnd, tabSubProc, 0, (DWORD_PTR) data) == FALSE)
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xpanic("error subclassing Tab to give it its own event handler", GetLastError());
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}
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void tabAppend(HWND hwnd, LPWSTR name)
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{
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TCITEM item;
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LRESULT n;
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ZeroMemory(&item, sizeof (TCITEM));
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item.mask = TCIF_TEXT;
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item.pszText = name;
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// MSDN's example code uses the first invalid index directly for this
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n = SendMessageW(hwnd, TCM_GETITEMCOUNT, 0, 0);
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if (SendMessageW(hwnd, TCM_INSERTITEM, (WPARAM) n, (LPARAM) (&item)) == (LRESULT) -1)
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xpanic("error adding tab to Tab", GetLastError());
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}
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void tabGetContentRect(HWND hwnd, RECT *r)
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{
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// not &r; already a pointer (thanks MindChild in irc.efnet.net/#winprog for spotting my failure)
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SendMessageW(hwnd, TCM_ADJUSTRECT, FALSE, (LPARAM) r);
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}
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// theoretically we don't need to iterate over every tab for this, but let's do it just to be safe
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LONG tabGetTabHeight(HWND hwnd)
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{
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RECT r;
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LRESULT i, n;
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LONG tallest;
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n = SendMessageW(hwnd, TCM_GETITEMCOUNT, 0, 0);
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// if there are no tabs, then the control just draws a box over the full window rect, reserving no space for tabs; this is handled with the next line
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tallest = 0;
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for (i = 0; i < n; i++) {
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if (SendMessageW(hwnd, TCM_GETITEMRECT, (WPARAM) i, (LPARAM) (&r)) == FALSE)
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xpanic("error getting tab height for Tab.preferredSize()", GetLastError());
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if (tallest < (r.bottom - r.top))
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tallest = r.bottom - r.top;
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}
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return tallest;
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}
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void tabEnterChildren(HWND hwnd)
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{
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DWORD style, xstyle;
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style = (DWORD) GetWindowLongPtrW(hwnd, GWL_STYLE);
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xstyle = (DWORD) GetWindowLongPtrW(hwnd, GWL_EXSTYLE);
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style &= ~((DWORD) WS_TABSTOP);
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xstyle |= WS_EX_CONTROLPARENT;
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SetWindowLongPtrW(hwnd, GWL_STYLE, (LONG_PTR) style);
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SetWindowLongPtrW(hwnd, GWL_EXSTYLE, (LONG_PTR) xstyle);
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}
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void tabLeaveChildren(HWND hwnd)
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{
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DWORD style, xstyle;
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style = (DWORD) GetWindowLongPtrW(hwnd, GWL_STYLE);
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xstyle = (DWORD) GetWindowLongPtrW(hwnd, GWL_EXSTYLE);
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style |= WS_TABSTOP;
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xstyle &= ~((DWORD) WS_EX_CONTROLPARENT);
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SetWindowLongPtrW(hwnd, GWL_STYLE, (LONG_PTR) style);
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SetWindowLongPtrW(hwnd, GWL_EXSTYLE, (LONG_PTR) xstyle);
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}
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