Started re-adding Area to the Windows backend: ported the existing code to C.
This commit is contained in:
Pietro Gagliardi
parent
c1055ae278
commit
bccfde2c34
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/* 24 march 2014 */
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/* TODO either strip the // comments or find out if --std=c99 is safe for cgo */
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#include "winapi_windows.h"
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#include "_cgo_epxort.h"
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LPWSTR areaWindowClass = L"gouiarea";
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static void getScrollPos(HWND hwnd, int *xpos, int *ypos)
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{
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SCROLLINFO si;
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ZeroMemory(&si, sizeof (SCROLLINFO));
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si.cbSize = sizeof (SCROLLINFO);
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si.fMask = SIF_POS | SIF_TRACKPOS;
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if (GetScrollInfo(hwnd, SB_HORZ, &si) == 0)
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xpanic("error getting horizontal scroll position for Area", GetLastError());
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*xpos = si.nPos;
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// MSDN example code reinitializes this each time, so we'll do it too just to be safe
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ZeroMemory(&si, sizeof (SCROLLINFO));
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si.cbSize = sizeof (SCROLLINFO);
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si.fMask = SIF_POS | SIF_TRACKPOS;
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if (GetScrollInfo(hwnd, _SB_VERT, &si) == 0)
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xpanic("error getting vertical scroll position for Area", GetLastError());
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*ypos = si.nPos;
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}
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#define areaBackgroundBrush ((HBRUSH) (COLOR_BTNFACE + 1))
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static void paintArea(HWND hwnd, void *data)
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{
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RECT xrect;
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PAINTSTRUCT ps;
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HDC hdc;
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HDC rdc;
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HBITMAP rbitmap, prevrbitmap;
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RECT rrect;
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BITMAPINFO bi;
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VOID *ppvBits;
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HBITMAP ibitmap;
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HDC idc;
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HBITMAP previbitmap;
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BLENDFUNCTION blendfunc;
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void *i;
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intptr_t dx, dy;
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int hscroll, vscroll;
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// TRUE here indicates a
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if (GetUpdateRect(hwnd, &xrect, TRUE) == 0)
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return; // no update rect; do nothing
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getScrollPos(s.hwnd, &hscroll, &vscroll);
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i = doPaint(&xrect, hscroll, vscroll, data, &dx, &dy);
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if (i == NULL) // cliprect empty
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return;
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// don't convert to BRGA just yet; see below
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// TODO don't do the above, but always draw the background color?
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hdc = BeginPaint(hwnd, &ps);
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if (hdc == NULL)
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xpanic("error beginning Area repaint", GetLastError());
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// very big thanks to Ninjifox for suggesting this technique and helping me go through it
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// first let's create the destination image, which we fill with the windows background color
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// this is how we fake drawing the background; see also http://msdn.microsoft.com/en-us/library/ms969905.aspx
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rdc = CreateCompatibleDC(hdc);
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if (rdc == NULL)
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xpanic("error creating off-screen rendering DC", GetLastError());
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// the bitmap has to be compatible with the window
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// if we create a bitmap compatible with the DC we just created, it'll be monochrome
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// thanks to David Heffernan in http://stackoverflow.com/questions/23033636/winapi-gdi-fillrectcolor-btnface-fills-with-strange-grid-like-brush-on-window
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rbitmap = CreateCompatibleBitmap(hdc, xrect.right - xrect.left, xrect.bottom - xrect.top);
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if (rbitmap == NULL)
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xpanic("error creating off-screen rendering bitmap", GetLastError());
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prevrbitmap = (HBITMAP) SelectObject(rdc, rbitmap);
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if (prevrbitmap == NULL)
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xpanic("error connecting off-screen rendering bitmap to off-screen rendering DC", GetLastError());
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rrect.left = 0;
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rrect.right = xrect.right - xrect.left;
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rrect.top = 0;
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rrect.bottom = xrect.bottom - xrect.top;
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if (FillRect(rdc, &rrect, areaBackgroundBrush) == 0)
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xpanic("error filling off-screen rendering bitmap with the system background color", GetLastError());
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// now we need to shove realbits into a bitmap
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// technically bitmaps don't know about alpha; they just ignore the alpha byte
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// AlphaBlend(), however, sees it - see http://msdn.microsoft.com/en-us/library/windows/desktop/dd183352%28v=vs.85%29.aspx
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ZeroMemory(&bi, sizeof (BITMAPINFO));
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bi.bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
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bi.bmiHeader.biWidth = int32(i.Rect.Dx())
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bi.bmiHeader.biHeight = -int32(i.Rect.Dy()) // negative height to force top-down drawing
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bi.bmiHeader.biPlanes = 1;
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bi.bmiHeader.biBitCount = 32;
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bi.bmiHeader.biCompression = BI_RGB;
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bi.bmiHeader.biSizeImage = (DWORD) (dx * dy * 4);
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// this is all we need, but because this confused me at first, I will say the two pixels-per-meter fields are unused (see http://blogs.msdn.com/b/oldnewthing/archive/2013/05/15/10418646.aspx and page 581 of Charles Petzold's Programming Windows, Fifth Edition)
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// now for the trouble: CreateDIBSection() allocates the memory for us...
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ibitmap = CreateDIBSection(NULL, // Ninjifox does this, so do some wine tests (http://source.winehq.org/source/dlls/gdi32/tests/bitmap.c#L725, thanks vpovirk in irc.freenode.net/#winehackers) and even Raymond Chen (http://blogs.msdn.com/b/oldnewthing/archive/2006/11/16/1086835.aspx), so.
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&bi, DIB_RGB_COLORS, &ppvBits, 0, 0);
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if (ibitmap == NULL)
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xpanic("error creating HBITMAP for image returned by AreaHandler.Paint()", GetLastError());
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// now we have to do TWO MORE things before we can finally do alpha blending
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// first, we need to load the bitmap memory, because Windows makes it for us
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// the pixels are arranged in RGBA order, but GDI requires BGRA
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// this turns out to be just ARGB in little endian; let's convert into this memory
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dotoARGB(i, ppvBits);
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// the second thing is... make a device context for the bitmap :|
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// Ninjifox just makes another compatible DC; we'll do the same
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idc = CreateCompatibleDC(hdc);
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if (idc == NULL)
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xpanic("error creating HDC for image returned by AreaHandler.Paint()", GetLastError());
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previbitmap = (HBITMAP) SelectObject(idc, ibitmap);
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if (previbitmap == NULL)
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xpanic("error connecting HBITMAP for image returned by AreaHandler.Paint() to its HDC", GetLastError());
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}
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// AND FINALLY WE CAN DO THE ALPHA BLENDING!!!!!!111
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blendfunc.BlendOp = AC_SRC_OVER;
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blendfunc.BlendFlags = 0;
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blendfunc.SourceConstantAlpha = 255; // only use per-pixel alphas
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blendfunc.AlphaFormat = AC_SRC_ALPHA; // premultiplied
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if (AlphaBlend(rdc, 0, 0, (int) dx, (int) dy, // destination
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idc, 0, 0, (int) dx, (int)dy, // source
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blendfunc) == FALSE)
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xpanic("error alpha-blending image returned by AreaHandler.Paint() onto background", GetLastError());
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// and finally we can just blit that into the window
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if (BitBlt(hdc, xrect.left, xrect.top, xrect.right - xrect.left, xrect.bottom - xrect.top,
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rdc, 0, 0, // from the rdc's origin
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SRCCOPY) == 0)
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xpanic("error blitting Area image to Area", GetLastError());
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// now to clean up
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if (SelectObject(idc, previbitmap) != ibitmap)
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xpanic("error reverting HDC for image returned by AreaHandler.Paint() to original HBITMAP", GetLastError());
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if (SelectObject(rdc, prevrbitmap) != rbitmap)
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xpanic("error reverting HDC for off-screen rendering to original HBITMAP", GetLastError());
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if (DeleteObject(ibitmap) == 0)
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xpanic("error deleting HBITMAP for image returned by AreaHandler.Paint()", GetLastError());
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if (DeleteObject(rbitmap) == 0)
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xpanic("error deleting HBITMAP for off-screen rendering", GetLastError());
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if (DeleteDC(idc) == 0)
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xpanic("error deleting HDC for image returned by AreaHandler.Paint()", GetLastError());
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if (DeleteDC(rdc) == 0)
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xpanic("error deleting HDC for off-screen rendering", GetLastError());
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EndPaint(hwnd, &ps);
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}
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static SIZE getAreaControlSize(HWND hwnd)
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{
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RECT rect;
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SIZE size;
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if (GetClientRect(hwnd, &rect) == 0)
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xpanic("error getting size of actual Area control", GetLastError());
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size.cx = (LONG) (rect.right - rect.left);
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size.cy = (LONG) (rect.bottom - rect.top);
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return size;
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}
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static void scrollArea(HWND hwnd, void *data, WPARAM wParam, int which)
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{
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SCROLILNFO si;
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SIZE size;
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LONG cwid, cht;
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LONG pagesize, maxsize;
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LONG newpos;
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LONG delta;
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LONG dx, dy;
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size = getAreaControlSize(hwnd);
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cwid = size.cx;
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cht = size.cy;
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if (which == SB_HORZ) {
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pagesize = cwid;
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maxsize = areaWidthLONG(data)
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} else if (which == SB_VERT) {
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pagesize = cht
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maxsize = areaHeightLONG(data)
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} else
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xpanic("invalid which sent to scrollArea()", 0);
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ZeroMemory(&si, sizeof (SCROLLINFO));
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si.cbSize = sizeof (SCROLLINFO);
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si.fMask = SIF_POS | SIF_TRACKPOS;
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if (GetScrollInfo(hwnd, which, &si) == 0)
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xpanic("error getting current scroll position for scrolling", GetLastError());
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newpos = (LONG) si.nPos;
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switch (LOWORD(wParam)) {
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case SB_LEFT: // also SB_TOP (TODO will C let me?)
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newpos = 0;
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break;
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case SB_RIGHT: // also SB_BOTTOM
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// see comment in adjustAreaScrollbars() below
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newpos = maxsize - pagesize;
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break;
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case SB_LINELEFT: // also SB_LINEUP
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newpos--;
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break;
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case SB_LINERIGHT: // also SB_LINEDOWN
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newpos++;
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break;
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case SB_PAGELEFT: // also SB_PAGEUP
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newpos -= pagesize;
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break;
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case SB_PAGERIGHT: // also SB_PAGEDOWN
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newpos += pagesize;
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break;
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case SB_THUMBPOSITION:
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// raymond chen says to just set the newpos to the SCROLLINFO nPos for this message; see http://blogs.msdn.com/b/oldnewthing/archive/2003/07/31/54601.aspx and http://blogs.msdn.com/b/oldnewthing/archive/2003/08/05/54602.aspx
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// do nothing here; newpos already has nPos
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break;
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case SB_THUMBTRACK:
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newpos = (LONG) si.nTrackPos;
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}
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// otherwise just keep the current position (that's what MSDN example code says, anyway)
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// make sure we're not out of range
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if (newpos < 0)
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newpos = 0;
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if (newpos > (maxsize - pagesize))
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newpos = maxsize - pagesize;
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// this would be where we would put a check to not scroll if the scroll position changed, but see the note about SB_THUMBPOSITION above: Raymond Chen's code always does the scrolling anyway in this case
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delta = -(newpos - si.nPos) // negative because ScrollWindowEx() scrolls in the opposite direction
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dx = delta
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dy = 0
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if (which == SB_VERT) {
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dx = 0
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dy = delta
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}
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if (ScrollWindowEx(hwnd,
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dx, dy, // TODO correct types
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// these four change what is scrolled and record info about the scroll; we're scrolling the whole client area and don't care about the returned information here
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// TODO pointers?
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0, 0, 0, 0,
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// mark the remaining rect as needing redraw and erase...
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SW_INVALIDATE | SW_ERASE) == ERROR)
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xpanic("error scrolling Area", GetLastError());
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// ...but don't redraw the window yet; we need to apply our scroll changes
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// we actually have to commit the change back to the scrollbar; otherwise the scroll position will merely reset itself
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ZeroMemory(&si, sizeof (SCROLLINFO));
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si.cbSize = sizeof (SCROLLINFO);
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si.fMask = SIF_POS;
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si.nPos = (int) newpos;
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// TODO double-check that this doesn't return an error
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SetScrollInfo(hwnd, which, &si);
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// NOW redraw it
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if (UpdateWindow(hwnd) == 0)
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panic("error updating Area after scrolling", GetLastError());
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}
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static void adjustAreaScrollbars(HWND hwnd, void *data)
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{
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SCROLLINFO si;
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SIZE size;
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LONG cwid, cht;
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size = getAreaControlSize(hwnd);
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cwid = size.cx;
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cht = size.cy;
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// the trick is we want a page to be the width/height of the visible area
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// so the scroll range would go from [0..image_dimension - control_dimension]
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// but judging from the sample code on MSDN, we don't need to do this; the scrollbar will do it for us
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// we DO need to handle it when scrolling, though, since the thumb can only go up to this upper limit
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// have to do horizontal and vertical separately
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ZeroMemory(&si, sizeof (SCROLLINFO));
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si.cbSize = sizeof (SCROLLINFO);
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si.fMask = SIF_RANGE | SIF_PAGE;
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si.nMin = 0;
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si.nMax = (int) (areaWidthLONG(data) - 1); // the max point is inclusive, so we have to pass in the last valid value, not the first invalid one (see http://blogs.msdn.com/b/oldnewthing/archive/2003/07/31/54601.aspx); if we don't, we get weird things like the scrollbar sometimes showing one extra scroll position at the end that you can never scroll to
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si.nPage = (UINT) cwid;
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SetScrollInfo(hwnd, SB_HORZ, &si, TRUE); // redraw the scroll bar
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// MSDN sample code does this a second time; let's do it too to be safe
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ZeroMemory(&si, sizeof (SCROLLINFO));
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si.cbSize = sizeof (SCROLLINFO);
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si.fMask = SIF_RANGE | SIF_PAGE;
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si.nMin = 0;
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si.nMax = (int) (areaHeightLONG(data) - 1);
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si.nPage = (UINT) cht;
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SetScrollInfo(hwnd, SB_VERT, &si, TRUE);
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}
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void repaintArea(HWND hwnd)
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{
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// TODO second argument pointer?
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// 0 - the whole area; TRUE - have windows erase if possible
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if (InvalidateRect(hwnd, 0, TRUE) == 0)
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xpanic("error flagging Area as needing repainting after event", GetLastError());
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if (UpdateWindow(hwnd) == 0)
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xpanic("error repainting Area after event", GetLastError());
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}
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void areaMouseEvent(HWND hwnd, void *data, DWORD button, BOOL up, LPARAM lParam)
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{
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int xpos, ypos;
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// mouse coordinates are relative to control; make them relative to Area
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getScrollPos(hwnd, &xpos, &ypos);
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xpos += GET_X_LPARAM(lParam);
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ypos += GET_Y_LPARAM(lParam);
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finishAreaMouseEvent(data, button, up, xpos, ypos);
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}
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var (
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_setFocus = user32.NewProc("SetFocus")
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)
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static LRESULT CALLBACK areaWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
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{
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void *data;
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DWORD which;
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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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storelpParam(hwnd, lParam);
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data = (void *) GetWindowLongPtrW(hwnd, GWLP_USERDATA);
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storeAreaHWND(data, hwnd);
|
||||||
|
}
|
||||||
|
/* act as if we're not ready yet, even during WM_NCCREATE (nothing important to the switch statement below happens here anyway) */
|
||||||
|
return DefWindowProcW(hwnd, uMsg, wParam, lParam);
|
||||||
|
}
|
||||||
|
|
||||||
|
switch (uMsg) {
|
||||||
|
case WM_PAINT:
|
||||||
|
paintArea(hwnd, data);
|
||||||
|
return 0;
|
||||||
|
case WM_ERASEBKGND:
|
||||||
|
// don't draw a background; we'll do so when painting
|
||||||
|
// this is to make things flicker-free; see http://msdn.microsoft.com/en-us/library/ms969905.aspx
|
||||||
|
return 1;
|
||||||
|
case WM_HSCROLL:
|
||||||
|
scrollArea(hwnd, data, wParam, SB_HORZ);
|
||||||
|
return 0;
|
||||||
|
case WM_VSCROLL:
|
||||||
|
scrollArea(hwnd, data, wParam, SB_VERT);
|
||||||
|
return 0;
|
||||||
|
case WM_SIZE:
|
||||||
|
adjustAreaScrollbars(hwnd, data);
|
||||||
|
return 0;
|
||||||
|
case WM_ACTIVATE:
|
||||||
|
// don't keep the double-click timer running if the user switched programs in between clicks
|
||||||
|
areaResetClickCounter(data);
|
||||||
|
return 0;
|
||||||
|
case WM_MOUSEACTIVATE:
|
||||||
|
// this happens on every mouse click (apparently), so DON'T reset the click counter, otherwise it will always be reset (not an issue, as MSDN says WM_ACTIVATE is sent alongside WM_MOUSEACTIVATE when necessary)
|
||||||
|
// transfer keyboard focus to our Area on an activating click
|
||||||
|
// (see http://www.catch22.net/tuts/custom-controls)
|
||||||
|
// don't bother checking SetFocus()'s error; see http://stackoverflow.com/questions/24073695/winapi-can-setfocus-return-null-without-an-error-because-thats-what-im-see/24074912#24074912
|
||||||
|
SetFocus(hwnd);
|
||||||
|
// and don't eat the click, as we want to handle clicks that switch into Windows with Areas from other windows
|
||||||
|
return MA_ACTIVATE;
|
||||||
|
case WM_MOUSEMOVE:
|
||||||
|
areaMouseEvent(hwnd, data, 0, FALSE, lParam);
|
||||||
|
return 0;
|
||||||
|
case WM_LBUTTONDOWN:
|
||||||
|
areaMouseEvent(hwnd, data, 1, FALSE, lParam);
|
||||||
|
return 0;
|
||||||
|
case WM_LBUTTONUP:
|
||||||
|
areaMouseEvent(hwnd, data, 1, TRUE, lParam)
|
||||||
|
return 0;
|
||||||
|
case WM_MBUTTONDOWN:
|
||||||
|
areaMouseEvent(hwnd, data, 2, FALSE, lParam);
|
||||||
|
return 0
|
||||||
|
case WM_MBUTTONUP:
|
||||||
|
areaMouseEvent(hwnd, data, 2, TRUE, lParam);
|
||||||
|
return 0;
|
||||||
|
case WM_RBUTTONDOWN:
|
||||||
|
areaMouseEvent(hwnd, data, 3, FALSE, lParam);
|
||||||
|
return 0;
|
||||||
|
case WM_RBUTTONUP:
|
||||||
|
areaMouseEvent(hwnd, data, 3, TRUE, lParam);
|
||||||
|
return 0;
|
||||||
|
case WM_XBUTTONDOWN:
|
||||||
|
// values start at 1; we want them to start at 4
|
||||||
|
which = (DWORD) GET_XBUTTON_WPARAM(wParam) + 3;
|
||||||
|
areaMouseEvent(hwnd, data, which, FALSE, lParam);
|
||||||
|
return TRUE; // XBUTTON messages are different!
|
||||||
|
case WM_XBUTTONUP:
|
||||||
|
which = (DWORD) GET_XBUTTON_WPARAM(wParam) + 3;
|
||||||
|
areaMouseEvent(hwnd, data, which, TRUE, lParam);
|
||||||
|
return TRUE;
|
||||||
|
case _WM_KEYDOWN:
|
||||||
|
areaKeyEvent(data, FALSE, wParam, lParam);
|
||||||
|
return 0;
|
||||||
|
case _WM_KEYUP:
|
||||||
|
areaKeyEvent(data, TRUE, wParam, lParam);
|
||||||
|
return 0;
|
||||||
|
// Alt+[anything] and F10 send these instead and require us to return to DefWindowProc() so global keystrokes such as Alt+Tab can be processed
|
||||||
|
case _WM_SYSKEYDOWN:
|
||||||
|
areaKeyEvent(data, FALSE, wParam, lParam);
|
||||||
|
return DefWindowProcW(hwnd, uMsg, wParam, lParam);
|
||||||
|
case _WM_SYSKEYUP:
|
||||||
|
areaKeyEvent(data, TRUE, wParam, lParam);
|
||||||
|
return DefWindowProcW(hwnd, uMsg, wParam, lParam);
|
||||||
|
case msgAreaSizeChanged:
|
||||||
|
adjustAreaScrollbars(hwnd, data);
|
||||||
|
repaintArea(hwnd); // this calls for an update
|
||||||
|
return 0;
|
||||||
|
case msgAreaRepaintAll:
|
||||||
|
repaintArea(hwnd);
|
||||||
|
return 0;
|
||||||
|
default:
|
||||||
|
return DefWindowProcW(hwnd, uMsg, wParam, lParam);
|
||||||
|
}
|
||||||
|
xmissedmsg("Area", "areaWndProc()", uMsg);
|
||||||
|
return 0; /* unreached */
|
||||||
|
}
|
||||||
|
|
||||||
|
DWORD makeAreaWindowClass(char **errmsg)
|
||||||
|
{
|
||||||
|
WNDCLASSW wc;
|
||||||
|
|
||||||
|
ZeroMemory(&wc, sizeof (WNDCLASSW));
|
||||||
|
wc.style = CS_HREDRAW | CS_VREDRAW; // no CS_DBLCLKS because do that manually
|
||||||
|
wc.lpszClassName = areaWindowClass;
|
||||||
|
wc.lpfnWndProc = areaWndProc;
|
||||||
|
wc.hInstance = hInstance;
|
||||||
|
wc.hIcon = hDefaultIcon;
|
||||||
|
wc.hCursor = hArrowCursor,
|
||||||
|
wc.hbrBackground = NULL; // no brush; we handle WM_ERASEBKGND
|
||||||
|
if (RegisterClassW(&wc) == 0) {
|
||||||
|
*errmsg = "error registering Area window class";
|
||||||
|
return GetLastError();
|
||||||
|
}
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
@ -0,0 +1,260 @@
|
||||||
|
// 24 march 2014
|
||||||
|
|
||||||
|
package ui
|
||||||
|
|
||||||
|
import (
|
||||||
|
"fmt"
|
||||||
|
"image"
|
||||||
|
"syscall"
|
||||||
|
"unsafe"
|
||||||
|
)
|
||||||
|
|
||||||
|
// #include "winapi_windows.h"
|
||||||
|
import "C"
|
||||||
|
|
||||||
|
const (
|
||||||
|
areastyle = _WS_HSCROLL | _WS_VSCROLL | controlstyle
|
||||||
|
areaxstyle = 0 | controlxstyle
|
||||||
|
)
|
||||||
|
|
||||||
|
//export doPaint
|
||||||
|
func doPaint(xrect *C.RECT, hscroll C.int, vscroll C.int, data unsafe.Pointer, dx *C.intptr_t, dy *C.intptr_t) unsafe.Pointer {
|
||||||
|
a := (*area)(data)
|
||||||
|
// both Windows RECT and Go image.Rect are point..point, so the following is correct
|
||||||
|
cliprect := image.Rect(int(xrect.left), int(xrect.top), int(xrect.right), int(xrect.bottom))
|
||||||
|
cliprect = cliprect.Add(image.Pt(int(hscroll), int(vscroll))) // adjust by scroll position
|
||||||
|
// make sure the cliprect doesn't fall outside the size of the Area
|
||||||
|
cliprect = cliprect.Intersect(image.Rect(0, 0, a.areawidth, a.areaheight))
|
||||||
|
if !cliprect.Empty() { // we have an update rect
|
||||||
|
i := a.handler.Paint(cliprect)
|
||||||
|
*dx = C.intptr_t(i.Rect.Dx())
|
||||||
|
*dy = C.intptr_t(i.Rect.Dy())
|
||||||
|
return unsafe.Pointer(i)
|
||||||
|
}
|
||||||
|
return nil
|
||||||
|
}
|
||||||
|
|
||||||
|
//export dotoARGB
|
||||||
|
func dotoARGB(img unsafe.Pointer, ppvBIts *C.VOID) {
|
||||||
|
i := (*image.RGBA)(unsafe.Pointer(img))
|
||||||
|
// the bitmap Windows gives us has a stride == width
|
||||||
|
toARGB(i, unsafe.Pointer(ppvBits), i.Rect.Dx() * 4)
|
||||||
|
}
|
||||||
|
|
||||||
|
//export areaWidthLONG
|
||||||
|
func areaWidthLONG(data unsafe.Pointer) C.LONG {
|
||||||
|
a := (*area)(data)
|
||||||
|
return C.LONG(a.width)
|
||||||
|
}
|
||||||
|
|
||||||
|
//export areaHeightLONG
|
||||||
|
func areaHeightLONG(data unsafe.Pointer) C.LONG {
|
||||||
|
a := (*area)(data)
|
||||||
|
return C.LONG(a.height)
|
||||||
|
}
|
||||||
|
|
||||||
|
func getModifiers() (m Modifiers) {
|
||||||
|
down := func(x C.int) bool {
|
||||||
|
// GetKeyState() gets the key state at the time of the message, so this is what we want
|
||||||
|
return (C.GetKeyState(x) & 0x80) != 0
|
||||||
|
}
|
||||||
|
|
||||||
|
if down(C.VK_CONTROL) {
|
||||||
|
m |= Ctrl
|
||||||
|
}
|
||||||
|
if down(C.VK_MENU) {
|
||||||
|
m |= Alt
|
||||||
|
}
|
||||||
|
if down(C.VK_SHIFT) {
|
||||||
|
m |= Shift
|
||||||
|
}
|
||||||
|
if down(C.VK_LWIN) || down(C.VK_RWIN) {
|
||||||
|
m |= Super
|
||||||
|
}
|
||||||
|
return m
|
||||||
|
}
|
||||||
|
|
||||||
|
//export finishAreaMouseEvent
|
||||||
|
func finishAreaMouseEvent(data unsafe.Pointer, cbutton C.DWORD, up C.BOOL, xpos C.int, ypos C.int) {
|
||||||
|
var me MouseEvent
|
||||||
|
|
||||||
|
a := (*area)(data)
|
||||||
|
button := uint(cbutton)
|
||||||
|
me.Pos = image.Pt(int(xpos), int(ypos))
|
||||||
|
if !me.Pos.In(image.Rect(0, 0, s.areawidth, s.areaheight)) { // outside the actual Area; no event
|
||||||
|
return
|
||||||
|
}
|
||||||
|
if up != C.FALSE {
|
||||||
|
me.Up = button
|
||||||
|
} else if button != 0 { // don't run the click counter if the mouse was only moved
|
||||||
|
me.Down = button
|
||||||
|
// this returns a LONG, which is int32, but we don't need to worry about the signedness because for the same bit widths and two's complement arithmetic, s1-s2 == u1-u2 if bits(s1)==bits(s2) and bits(u1)==bits(u2) (and Windows requires two's complement: http://blogs.msdn.com/b/oldnewthing/archive/2005/05/27/422551.aspx)
|
||||||
|
// signedness isn't much of an issue for these calls anyway because http://stackoverflow.com/questions/24022225/what-are-the-sign-extension-rules-for-calling-windows-api-functions-stdcall-t and that we're only using unsigned values (think back to how you (didn't) handle signedness in assembly language) AND because of the above AND because the statistics below (time interval and width/height) really don't make sense if negative
|
||||||
|
time := C.GetMessageTime()
|
||||||
|
maxTime := C.GetDoubleClickTime()
|
||||||
|
// ignore zero returns and errors; MSDN says zero will be returned on error but that GetLastError() is meaningless
|
||||||
|
xdist := C.GetSystemMetrics(C.SM_CXDOUBLECLK)
|
||||||
|
ydist, _, _ := C.GetSystemMetrics(C.SM_CYDOUBLECLK)
|
||||||
|
me.Count = s.clickCounter.click(button, me.Pos.X, me.Pos.Y,
|
||||||
|
time, maxTime, int(xdist/2), int(ydist/2))
|
||||||
|
}
|
||||||
|
// though wparam will contain control and shift state, let's use just one function to get modifiers for both keyboard and mouse events; it'll work the same anyway since we have to do this for alt and windows key (super)
|
||||||
|
me.Modifiers = getModifiers()
|
||||||
|
if button != 1 && (wparam&_MK_LBUTTON) != 0 {
|
||||||
|
me.Held = append(me.Held, 1)
|
||||||
|
}
|
||||||
|
if button != 2 && (wparam&_MK_MBUTTON) != 0 {
|
||||||
|
me.Held = append(me.Held, 2)
|
||||||
|
}
|
||||||
|
if button != 3 && (wparam&_MK_RBUTTON) != 0 {
|
||||||
|
me.Held = append(me.Held, 3)
|
||||||
|
}
|
||||||
|
if button != 4 && (wparam&_MK_XBUTTON1) != 0 {
|
||||||
|
me.Held = append(me.Held, 4)
|
||||||
|
}
|
||||||
|
if button != 5 && (wparam&_MK_XBUTTON2) != 0 {
|
||||||
|
me.Held = append(me.Held, 5)
|
||||||
|
}
|
||||||
|
repaint := a.handler.Mouse(me)
|
||||||
|
if repaint {
|
||||||
|
C.repaintArea(a.hwnd)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
//export areaKeyEvent
|
||||||
|
func areaKeyEvent(data unsafe.Pointer, up C.BOOL, wParam C.WPARAM, lParam C.LPARAM) {
|
||||||
|
var ke KeyEvent
|
||||||
|
|
||||||
|
a := (*area)(data)
|
||||||
|
lp := uint32(lParam) // to be safe
|
||||||
|
// the numeric keypad keys when Num Lock is off are considered left-hand keys as the separate navigation buttons were added later
|
||||||
|
// the numeric keypad enter, however, is a right-hand key because it has the same virtual-key code as the typewriter enter
|
||||||
|
righthand := (lp & 0x01000000) != 0
|
||||||
|
|
||||||
|
scancode := byte((lp >> 16) & 0xFF)
|
||||||
|
ke.Modifiers = getModifiers()
|
||||||
|
if extkey, ok := numpadextkeys[wParam]; ok && !righthand {
|
||||||
|
// the above is special handling for numpad keys to ignore the state of Num Lock and Shift; see http://blogs.msdn.com/b/oldnewthing/archive/2004/09/06/226045.aspx and https://github.com/glfw/glfw/blob/master/src/win32_window.c#L152
|
||||||
|
ke.ExtKey = extkey
|
||||||
|
} else if wParam == C.VK_RETURN && righthand {
|
||||||
|
ke.ExtKey = NEnter
|
||||||
|
} else if extkey, ok := extkeys[wParam]; ok {
|
||||||
|
ke.ExtKey = extkey
|
||||||
|
} else if mod, ok := modonlykeys[wParam]; ok {
|
||||||
|
ke.Modifier = mod
|
||||||
|
// don't include the modifier in ke.Modifiers
|
||||||
|
ke.Modifiers &^= mod
|
||||||
|
} else if xke, ok := fromScancode(uintptr(scancode)); ok {
|
||||||
|
// one of these will be nonzero
|
||||||
|
ke.Key = xke.Key
|
||||||
|
ke.ExtKey = xke.ExtKey
|
||||||
|
} else if ke.Modifiers == 0 {
|
||||||
|
// no key, extkey, or modifiers; do nothing
|
||||||
|
return
|
||||||
|
}
|
||||||
|
ke.Up = up
|
||||||
|
repaint := a.handler.Key(ke)
|
||||||
|
if repaint {
|
||||||
|
C.repaintArea(a)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// all mappings come from GLFW - https://github.com/glfw/glfw/blob/master/src/win32_window.c#L152
|
||||||
|
var numpadextkeys = map[C.WPARAM]ExtKey{
|
||||||
|
C.VK_HOME: N7,
|
||||||
|
C.VK_UP: N8,
|
||||||
|
C.VK_PRIOR: N9,
|
||||||
|
C.VK_LEFT: N4,
|
||||||
|
C.VK_CLEAR: N5,
|
||||||
|
C.VK_RIGHT: N6,
|
||||||
|
C.VK_END: N1,
|
||||||
|
C.VK_DOWN: N2,
|
||||||
|
C.VK_NEXT: N3,
|
||||||
|
C.VK_INSERT: N0,
|
||||||
|
C.VK_DELETE: NDot,
|
||||||
|
}
|
||||||
|
|
||||||
|
var extkeys = map[C.WPARAM]ExtKey{
|
||||||
|
C.VK_ESCAPE: Escape,
|
||||||
|
C.VK_INSERT: Insert,
|
||||||
|
C.VK_DELETE: Delete,
|
||||||
|
C.VK_HOME: Home,
|
||||||
|
C.VK_END: End,
|
||||||
|
C.VK_PRIOR: PageUp,
|
||||||
|
C.VK_NEXT: PageDown,
|
||||||
|
C.VK_UP: Up,
|
||||||
|
C.VK_DOWN: Down,
|
||||||
|
C.VK_LEFT: Left,
|
||||||
|
C.VK_RIGHT: Right,
|
||||||
|
C.VK_F1: F1,
|
||||||
|
C.VK_F2: F2,
|
||||||
|
C.VK_F3: F3,
|
||||||
|
C.VK_F4: F4,
|
||||||
|
C.VK_F5: F5,
|
||||||
|
C.VK_F6: F6,
|
||||||
|
C.VK_F7: F7,
|
||||||
|
C.VK_F8: F8,
|
||||||
|
C.VK_F9: F9,
|
||||||
|
C.VK_F10: F10,
|
||||||
|
C.VK_F11: F11,
|
||||||
|
C.VK_F12: F12,
|
||||||
|
// numpad numeric keys and . are handled in events_notdarwin.go
|
||||||
|
// numpad enter is handled in code above
|
||||||
|
C.VK_ADD: NAdd,
|
||||||
|
C.VK_SUBTRACT: NSubtract,
|
||||||
|
C.VK_MULTIPLY: NMultiply,
|
||||||
|
C.VK_DIVIDE: NDivide,
|
||||||
|
}
|
||||||
|
|
||||||
|
// sanity check
|
||||||
|
func init() {
|
||||||
|
included := make([]bool, _nextkeys)
|
||||||
|
for _, v := range extkeys {
|
||||||
|
included[v] = true
|
||||||
|
}
|
||||||
|
for i := 1; i < int(_nextkeys); i++ {
|
||||||
|
if i >= int(N0) && i <= int(N9) { // skip numpad numbers, ., and enter
|
||||||
|
continue
|
||||||
|
}
|
||||||
|
if i == int(NDot) || i == int(NEnter) {
|
||||||
|
continue
|
||||||
|
}
|
||||||
|
if !included[i] {
|
||||||
|
panic(fmt.Errorf("error: not all ExtKeys defined on Windows (missing %d)", i))
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
var modonlykeys = map[C.WPARAM]Modifiers{
|
||||||
|
// even if the separate left/right aren't necessary, have them here anyway, just to be safe
|
||||||
|
C.VK_CONTROL: Ctrl,
|
||||||
|
C.VK_LCONTROL: Ctrl,
|
||||||
|
C.VK_RCONTROL: Ctrl,
|
||||||
|
C.VK_MENU: Alt,
|
||||||
|
C.VK_LMENU: Alt,
|
||||||
|
C.VK_RMENU: Alt,
|
||||||
|
C.VK_SHIFT: Shift,
|
||||||
|
C.VK_LSHIFT: Shift,
|
||||||
|
C.VK_RSHIFT: Shift,
|
||||||
|
// there's no combined Windows key virtual-key code as there is with the others
|
||||||
|
C.VK_LWIN: Super,
|
||||||
|
C.VK_RWIN: Super,
|
||||||
|
}
|
||||||
|
|
||||||
|
// TODO storeAreaHWND
|
||||||
|
|
||||||
|
//export areaResetClickCounter
|
||||||
|
func areaResetClickCounter(data unsafe.Pointer) {
|
||||||
|
a := (*area)(data)
|
||||||
|
a.clickCounter.reset()
|
||||||
|
}
|
||||||
|
|
||||||
|
func registerAreaWndClass() (err error) {
|
||||||
|
var errmsg *C.char
|
||||||
|
|
||||||
|
err := C.makeWindowWindowClass(&errmsg)
|
||||||
|
if err != 0 || errmsg != nil {
|
||||||
|
return fmt.Errorf("%s: %v", C.GoString(errmsg), syscall.Errno(err))
|
||||||
|
}
|
||||||
|
return nil
|
||||||
|
}
|
||||||
|
|
@ -26,6 +26,8 @@ enum {
|
||||||
msgRequest = WM_APP + 1, /* + 1 just to be safe */
|
msgRequest = WM_APP + 1, /* + 1 just to be safe */
|
||||||
msgCOMMAND, /* WM_COMMAND proxy; see forwardCommand() in controls_windows.go */
|
msgCOMMAND, /* WM_COMMAND proxy; see forwardCommand() in controls_windows.go */
|
||||||
msgNOTIFY, /* WM_NOTIFY proxy */
|
msgNOTIFY, /* WM_NOTIFY proxy */
|
||||||
|
msgAreaSizeChanged,
|
||||||
|
msgAreaRepaintAll,
|
||||||
};
|
};
|
||||||
|
|
||||||
/* uitask_windows.c */
|
/* uitask_windows.c */
|
||||||
|
|
@ -99,4 +101,9 @@ extern void tableAddExtendedStyles(HWND, LPARAM);
|
||||||
extern DWORD makeContainerWindowClass(char **);
|
extern DWORD makeContainerWindowClass(char **);
|
||||||
extern HWND newContainer(void *);
|
extern HWND newContainer(void *);
|
||||||
|
|
||||||
|
/* area_window.c */
|
||||||
|
extern LPWSTR areaWindowClass;
|
||||||
|
extern void repaintArea(HWND);
|
||||||
|
extern DWORD makeAreaWindowClass(char **);
|
||||||
|
|
||||||
#endif
|
#endif
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue