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Removed the whole store**HWND spiel. No longer works properly (nil pointers woo).

This commit is contained in:
Pietro Gagliardi 2014-10-16 13:53:05 -04:00
parent e78624f057
commit b27671740d
8 changed files with 972 additions and 27 deletions
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500
newctrl/area_windows.c Normal file
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@ -0,0 +1,500 @@
// 24 march 2014
#include "winapi_windows.h"
#include "_cgo_export.h"
static void getScrollPos(HWND hwnd, int *xpos, int *ypos)
{
SCROLLINFO si;
ZeroMemory(&si, sizeof (SCROLLINFO));
si.cbSize = sizeof (SCROLLINFO);
si.fMask = SIF_POS | SIF_TRACKPOS;
if (GetScrollInfo(hwnd, SB_HORZ, &si) == 0)
xpanic("error getting horizontal scroll position for Area", GetLastError());
*xpos = si.nPos;
// MSDN example code reinitializes this each time, so we'll do it too just to be safe
ZeroMemory(&si, sizeof (SCROLLINFO));
si.cbSize = sizeof (SCROLLINFO);
si.fMask = SIF_POS | SIF_TRACKPOS;
if (GetScrollInfo(hwnd, SB_VERT, &si) == 0)
xpanic("error getting vertical scroll position for Area", GetLastError());
*ypos = si.nPos;
}
#define areaBackgroundBrush ((HBRUSH) (COLOR_BTNFACE + 1))
static void paintArea(HWND hwnd, void *data)
{
RECT xrect;
PAINTSTRUCT ps;
HDC hdc;
HDC rdc;
HBITMAP rbitmap, prevrbitmap;
RECT rrect;
BITMAPINFO bi;
VOID *ppvBits;
HBITMAP ibitmap;
HDC idc;
HBITMAP previbitmap;
BLENDFUNCTION blendfunc;
void *i;
intptr_t dx, dy;
int hscroll, vscroll;
// FALSE here indicates don't send WM_ERASEBKGND
if (GetUpdateRect(hwnd, &xrect, FALSE) == 0)
return; // no update rect; do nothing
getScrollPos(hwnd, &hscroll, &vscroll);
hdc = BeginPaint(hwnd, &ps);
if (hdc == NULL)
xpanic("error beginning Area repaint", GetLastError());
// very big thanks to Ninjifox for suggesting this technique and helping me go through it
// first let's create the destination image, which we fill with the windows background color
// this is how we fake drawing the background; see also http://msdn.microsoft.com/en-us/library/ms969905.aspx
rdc = CreateCompatibleDC(hdc);
if (rdc == NULL)
xpanic("error creating off-screen rendering DC", GetLastError());
// the bitmap has to be compatible with the window
// if we create a bitmap compatible with the DC we just created, it'll be monochrome
// thanks to David Heffernan in http://stackoverflow.com/questions/23033636/winapi-gdi-fillrectcolor-btnface-fills-with-strange-grid-like-brush-on-window
rbitmap = CreateCompatibleBitmap(hdc, xrect.right - xrect.left, xrect.bottom - xrect.top);
if (rbitmap == NULL)
xpanic("error creating off-screen rendering bitmap", GetLastError());
prevrbitmap = (HBITMAP) SelectObject(rdc, rbitmap);
if (prevrbitmap == NULL)
xpanic("error connecting off-screen rendering bitmap to off-screen rendering DC", GetLastError());
rrect.left = 0;
rrect.right = xrect.right - xrect.left;
rrect.top = 0;
rrect.bottom = xrect.bottom - xrect.top;
if (FillRect(rdc, &rrect, areaBackgroundBrush) == 0)
xpanic("error filling off-screen rendering bitmap with the system background color", GetLastError());
i = doPaint(&xrect, hscroll, vscroll, data, &dx, &dy);
if (i == NULL) // cliprect empty
goto nobitmap; // we need to blit the background no matter what
// now we need to shove realbits into a bitmap
// technically bitmaps don't know about alpha; they just ignore the alpha byte
// AlphaBlend(), however, sees it - see http://msdn.microsoft.com/en-us/library/windows/desktop/dd183352%28v=vs.85%29.aspx
ZeroMemory(&bi, sizeof (BITMAPINFO));
bi.bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
bi.bmiHeader.biWidth = (LONG) dx;
bi.bmiHeader.biHeight = -((LONG) dy); // negative height to force top-down drawing
bi.bmiHeader.biPlanes = 1;
bi.bmiHeader.biBitCount = 32;
bi.bmiHeader.biCompression = BI_RGB;
bi.bmiHeader.biSizeImage = (DWORD) (dx * dy * 4);
// 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)
// now for the trouble: CreateDIBSection() allocates the memory for us...
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.
&bi, DIB_RGB_COLORS, &ppvBits, 0, 0);
if (ibitmap == NULL)
xpanic("error creating HBITMAP for image returned by AreaHandler.Paint()", GetLastError());
// now we have to do TWO MORE things before we can finally do alpha blending
// first, we need to load the bitmap memory, because Windows makes it for us
// the pixels are arranged in RGBA order, but GDI requires BGRA
// this turns out to be just ARGB in little endian; let's convert into this memory
dotoARGB(i, (void *) ppvBits, FALSE); // FALSE = not NRGBA
// the second thing is... make a device context for the bitmap :|
// Ninjifox just makes another compatible DC; we'll do the same
idc = CreateCompatibleDC(hdc);
if (idc == NULL)
xpanic("error creating HDC for image returned by AreaHandler.Paint()", GetLastError());
previbitmap = (HBITMAP) SelectObject(idc, ibitmap);
if (previbitmap == NULL)
xpanic("error connecting HBITMAP for image returned by AreaHandler.Paint() to its HDC", GetLastError());
// AND FINALLY WE CAN DO THE ALPHA BLENDING!!!!!!111
blendfunc.BlendOp = AC_SRC_OVER;
blendfunc.BlendFlags = 0;
blendfunc.SourceConstantAlpha = 255; // only use per-pixel alphas
blendfunc.AlphaFormat = AC_SRC_ALPHA; // premultiplied
if (AlphaBlend(rdc, 0, 0, (int) dx, (int) dy, // destination
idc, 0, 0, (int) dx, (int)dy, // source
blendfunc) == FALSE)
xpanic("error alpha-blending image returned by AreaHandler.Paint() onto background", GetLastError());
// clean up after idc/ibitmap here because of the goto nobitmap
if (SelectObject(idc, previbitmap) != ibitmap)
xpanic("error reverting HDC for image returned by AreaHandler.Paint() to original HBITMAP", GetLastError());
if (DeleteObject(ibitmap) == 0)
xpanic("error deleting HBITMAP for image returned by AreaHandler.Paint()", GetLastError());
if (DeleteDC(idc) == 0)
xpanic("error deleting HDC for image returned by AreaHandler.Paint()", GetLastError());
nobitmap:
// and finally we can just blit that into the window
if (BitBlt(hdc, xrect.left, xrect.top, xrect.right - xrect.left, xrect.bottom - xrect.top,
rdc, 0, 0, // from the rdc's origin
SRCCOPY) == 0)
xpanic("error blitting Area image to Area", GetLastError());
// now to clean up
if (SelectObject(rdc, prevrbitmap) != rbitmap)
xpanic("error reverting HDC for off-screen rendering to original HBITMAP", GetLastError());
if (DeleteObject(rbitmap) == 0)
xpanic("error deleting HBITMAP for off-screen rendering", GetLastError());
if (DeleteDC(rdc) == 0)
xpanic("error deleting HDC for off-screen rendering", GetLastError());
EndPaint(hwnd, &ps);
}
static SIZE getAreaControlSize(HWND hwnd)
{
RECT rect;
SIZE size;
if (GetClientRect(hwnd, &rect) == 0)
xpanic("error getting size of actual Area control", GetLastError());
size.cx = (LONG) (rect.right - rect.left);
size.cy = (LONG) (rect.bottom - rect.top);
return size;
}
static void scrollArea(HWND hwnd, void *data, WPARAM wParam, int which)
{
SCROLLINFO si;
SIZE size;
LONG cwid, cht;
LONG pagesize, maxsize;
LONG newpos;
LONG delta;
LONG dx, dy;
size = getAreaControlSize(hwnd);
cwid = size.cx;
cht = size.cy;
if (which == SB_HORZ) {
pagesize = cwid;
maxsize = areaWidthLONG(data);
} else if (which == SB_VERT) {
pagesize = cht;
maxsize = areaHeightLONG(data);
} else
xpanic("invalid which sent to scrollArea()", 0);
ZeroMemory(&si, sizeof (SCROLLINFO));
si.cbSize = sizeof (SCROLLINFO);
si.fMask = SIF_POS | SIF_TRACKPOS;
if (GetScrollInfo(hwnd, which, &si) == 0)
xpanic("error getting current scroll position for scrolling", GetLastError());
newpos = (LONG) si.nPos;
switch (LOWORD(wParam)) {
case SB_LEFT: // also SB_TOP; C won't let me have both (C89 §6.6.4.2; C99 §6.8.4.2)
newpos = 0;
break;
case SB_RIGHT: // also SB_BOTTOM
// see comment in adjustAreaScrollbars() below
newpos = maxsize - pagesize;
break;
case SB_LINELEFT: // also SB_LINEUP
newpos--;
break;
case SB_LINERIGHT: // also SB_LINEDOWN
newpos++;
break;
case SB_PAGELEFT: // also SB_PAGEUP
newpos -= pagesize;
break;
case SB_PAGERIGHT: // also SB_PAGEDOWN
newpos += pagesize;
break;
case SB_THUMBPOSITION:
// 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
// do nothing here; newpos already has nPos
break;
case SB_THUMBTRACK:
newpos = (LONG) si.nTrackPos;
}
// otherwise just keep the current position (that's what MSDN example code says, anyway)
// make sure we're not out of range
if (newpos < 0)
newpos = 0;
if (newpos > (maxsize - pagesize))
newpos = maxsize - pagesize;
// 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
delta = -(newpos - si.nPos); // negative because ScrollWindowEx() scrolls in the opposite direction
dx = delta;
dy = 0;
if (which == SB_VERT) {
dx = 0;
dy = delta;
}
// this automatically scrolls the edit control, if any
if (ScrollWindowEx(hwnd,
(int) dx, (int) dy,
// 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
NULL, NULL, NULL, NULL,
// mark the remaining rect as needing redraw and erase...
SW_INVALIDATE | SW_ERASE) == ERROR)
xpanic("error scrolling Area", GetLastError());
// ...but don't redraw the window yet; we need to apply our scroll changes
// we actually have to commit the change back to the scrollbar; otherwise the scroll position will merely reset itself
ZeroMemory(&si, sizeof (SCROLLINFO));
si.cbSize = sizeof (SCROLLINFO);
si.fMask = SIF_POS;
si.nPos = (int) newpos;
// this is not expressly documented as returning an error so IDK what the error code is so assume there is none
SetScrollInfo(hwnd, which, &si, TRUE); // redraw scrollbar
// NOW redraw it
if (UpdateWindow(hwnd) == 0)
xpanic("error updating Area after scrolling", GetLastError());
if ((HWND) GetWindowLongPtrW(hwnd, 0) != NULL)
if (UpdateWindow((HWND) GetWindowLongPtrW(hwnd, 0)) == 0)
xpanic("error updating Area TextField after scrolling", GetLastError());
}
static void adjustAreaScrollbars(HWND hwnd, void *data)
{
SCROLLINFO si;
SIZE size;
LONG cwid, cht;
size = getAreaControlSize(hwnd);
cwid = size.cx;
cht = size.cy;
// the trick is we want a page to be the width/height of the visible area
// so the scroll range would go from [0..image_dimension - control_dimension]
// but judging from the sample code on MSDN, we don't need to do this; the scrollbar will do it for us
// we DO need to handle it when scrolling, though, since the thumb can only go up to this upper limit
// have to do horizontal and vertical separately
ZeroMemory(&si, sizeof (SCROLLINFO));
si.cbSize = sizeof (SCROLLINFO);
si.fMask = SIF_RANGE | SIF_PAGE;
si.nMin = 0;
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
si.nPage = (UINT) cwid;
SetScrollInfo(hwnd, SB_HORZ, &si, TRUE); // redraw the scroll bar
// MSDN sample code does this a second time; let's do it too to be safe
ZeroMemory(&si, sizeof (SCROLLINFO));
si.cbSize = sizeof (SCROLLINFO);
si.fMask = SIF_RANGE | SIF_PAGE;
si.nMin = 0;
si.nMax = (int) (areaHeightLONG(data) - 1);
si.nPage = (UINT) cht;
SetScrollInfo(hwnd, SB_VERT, &si, TRUE);
}
void repaintArea(HWND hwnd, RECT *r)
{
// NULL - the whole area; TRUE - have windows erase if possible
if (InvalidateRect(hwnd, r, TRUE) == 0)
xpanic("error flagging Area as needing repainting after event", GetLastError());
if (UpdateWindow(hwnd) == 0)
xpanic("error repainting Area after event", GetLastError());
}
void areaMouseEvent(HWND hwnd, void *data, DWORD button, BOOL up, uintptr_t heldButtons, LPARAM lParam)
{
int xpos, ypos;
// mouse coordinates are relative to control; make them relative to Area
getScrollPos(hwnd, &xpos, &ypos);
xpos += GET_X_LPARAM(lParam);
ypos += GET_Y_LPARAM(lParam);
finishAreaMouseEvent(data, button, up, heldButtons, xpos, ypos);
}
static LRESULT CALLBACK areaWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
void *data;
DWORD which;
uintptr_t heldButtons = (uintptr_t) wParam;
LRESULT lResult;
data = getWindowData(hwnd, uMsg, wParam, lParam, &lResult);
if (data == NULL)
return lResult;
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_MOUSEMOVE:
areaMouseEvent(hwnd, data, 0, FALSE, heldButtons, lParam);
return 0;
case WM_LBUTTONDOWN:
SetFocus(hwnd);
areaMouseEvent(hwnd, data, 1, FALSE, heldButtons, lParam);
return 0;
case WM_LBUTTONUP:
areaMouseEvent(hwnd, data, 1, TRUE, heldButtons, lParam);
return 0;
case WM_MBUTTONDOWN:
SetFocus(hwnd);
areaMouseEvent(hwnd, data, 2, FALSE, heldButtons, lParam);
return 0;
case WM_MBUTTONUP:
areaMouseEvent(hwnd, data, 2, TRUE, heldButtons, lParam);
return 0;
case WM_RBUTTONDOWN:
SetFocus(hwnd);
areaMouseEvent(hwnd, data, 3, FALSE, heldButtons, lParam);
return 0;
case WM_RBUTTONUP:
areaMouseEvent(hwnd, data, 3, TRUE, heldButtons, lParam);
return 0;
case WM_XBUTTONDOWN:
SetFocus(hwnd);
// values start at 1; we want them to start at 4
which = (DWORD) GET_XBUTTON_WPARAM(wParam) + 3;
heldButtons = (uintptr_t) GET_KEYSTATE_WPARAM(wParam);
areaMouseEvent(hwnd, data, which, FALSE, heldButtons, lParam);
return TRUE; // XBUTTON messages are different!
case WM_XBUTTONUP:
which = (DWORD) GET_XBUTTON_WPARAM(wParam) + 3;
heldButtons = (uintptr_t) GET_KEYSTATE_WPARAM(wParam);
areaMouseEvent(hwnd, data, which, TRUE, heldButtons, lParam);
return TRUE;
case msgAreaKeyDown:
return (LRESULT) areaKeyEvent(data, FALSE, wParam, lParam);
case msgAreaKeyUp:
return (LRESULT) areaKeyEvent(data, TRUE, wParam, lParam);
case msgAreaSizeChanged:
adjustAreaScrollbars(hwnd, data);
repaintArea(hwnd, NULL); // this calls for an update
return 0;
case msgAreaGetScroll:
getScrollPos(hwnd, (int *) wParam, (int *) lParam);
return 0;
case msgAreaRepaint:
repaintArea(hwnd, (RECT *) lParam);
return 0;
case msgAreaRepaintAll:
repaintArea(hwnd, NULL);
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
wc.cbWndExtra = 3 * sizeof (LONG_PTR); // text field handle, text field current x, text field current y
if (RegisterClassW(&wc) == 0) {
*errmsg = "error registering Area window class";
return GetLastError();
}
return 0;
}
HWND newArea(void *data)
{
HWND hwnd;
hwnd = CreateWindowExW(
0,
areaWindowClass, L"",
WS_HSCROLL | WS_VSCROLL | WS_CHILD | WS_VISIBLE | WS_TABSTOP,
CW_USEDEFAULT, CW_USEDEFAULT,
100, 100,
msgwin, NULL, hInstance, data);
if (hwnd == NULL)
xpanic("container creation failed", GetLastError());
return hwnd;
}
static LRESULT CALLBACK areaTextFieldSubProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR id, DWORD_PTR data)
{
switch (uMsg) {
case WM_KILLFOCUS:
ShowWindow(hwnd, SW_HIDE);
areaTextFieldDone((void *) data);
return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
case WM_NCDESTROY:
if ((*fv_RemoveWindowSubclass)(hwnd, areaTextFieldSubProc, id) == FALSE)
xpanic("error removing Area TextField subclass (which was for handling WM_KILLFOCUS)", GetLastError());
return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
default:
return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
}
xmissedmsg("Area TextField", "areaTextFieldSubProc()", uMsg);
return 0; // unreached
}
HWND newAreaTextField(HWND area, void *goarea)
{
HWND tf;
tf = CreateWindowExW(textfieldExtStyle,
L"edit", L"",
textfieldStyle | WS_CHILD,
0, 0, 0, 0,
area, NULL, hInstance, NULL);
if (tf == NULL)
xpanic("error making Area TextField", GetLastError());
if ((*fv_SetWindowSubclass)(tf, areaTextFieldSubProc, 0, (DWORD_PTR) goarea) == FALSE)
xpanic("error subclassing Area TextField to give it its own WM_KILLFOCUS handler", GetLastError());
return tf;
}
void areaOpenTextField(HWND area, HWND textfield, int x, int y, int width, int height)
{
int sx, sy;
int baseX, baseY;
LONG unused;
getScrollPos(area, &sx, &sy);
x += sx;
y += sy;
calculateBaseUnits(textfield, &baseX, &baseY, &unused);
width = MulDiv(width, baseX, 4);
height = MulDiv(height, baseY, 8);
if (MoveWindow(textfield, x, y, width, height, TRUE) == 0)
xpanic("error moving Area TextField in Area.OpenTextFieldAt()", GetLastError());
ShowWindow(textfield, SW_SHOW);
if (SetFocus(textfield) == NULL)
xpanic("error giving Area TextField focus", GetLastError());
}
void areaMarkTextFieldDone(HWND area)
{
SetWindowLongPtrW(area, 0, (LONG_PTR) NULL);
}

6
newctrl/area_windows.go
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@ -324,12 +324,6 @@ var modonlykeys = map[C.WPARAM]Modifiers{
C.VK_RWIN: Super,
}
//export storeAreaHWND
func storeAreaHWND(data unsafe.Pointer, hwnd C.HWND) {
a := (*area)(data)
a.hwnd = hwnd
}
//export areaResetClickCounter
func areaResetClickCounter(data unsafe.Pointer) {
a := (*area)(data)

136
newctrl/common_windows.c Normal file
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@ -0,0 +1,136 @@
// 17 july 2014
#include "winapi_windows.h"
#include "_cgo_export.h"
LRESULT getWindowTextLen(HWND hwnd)
{
return SendMessageW(hwnd, WM_GETTEXTLENGTH, 0, 0);
}
void getWindowText(HWND hwnd, WPARAM n, LPWSTR buf)
{
SetLastError(0);
if (SendMessageW(hwnd, WM_GETTEXT, n + 1, (LPARAM) buf) != (LRESULT) n)
xpanic("WM_GETTEXT did not copy the correct number of characters out", GetLastError());
}
void setWindowText(HWND hwnd, LPWSTR text)
{
switch (SendMessageW(hwnd, WM_SETTEXT, 0, (LPARAM) text)) {
case FALSE:
xpanic("WM_SETTEXT failed", GetLastError());
}
}
void updateWindow(HWND hwnd)
{
if (UpdateWindow(hwnd) == 0)
xpanic("error calling UpdateWindow()", GetLastError());
}
void *getWindowData(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam, LRESULT *lResult)
{
CREATESTRUCTW *cs = (CREATESTRUCTW *) lParam;
void *data;
data = (void *) GetWindowLongPtrW(hwnd, GWLP_USERDATA);
if (data == NULL) {
// the lpParam is available during WM_NCCREATE and WM_CREATE
if (uMsg == WM_NCCREATE)
SetWindowLongPtrW(hwnd, GWLP_USERDATA, (LONG_PTR) (cs->lpCreateParams));
// act as if we're not ready yet, even during WM_NCCREATE (nothing important to the switch statement below happens here anyway)
*lResult = DefWindowProcW(hwnd, uMsg, wParam, lParam);
}
return data;
}
/*
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
*/
/*
all controls that have events receive the events themselves through subclasses
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.
*/
static 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 forwardNotify(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
NMHDR *nmhdr = (NMHDR *) lParam;
HWND control = nmhdr->hwndFrom;
// 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, msgNOTIFY, wParam, lParam);
return DefWindowProcW(hwnd, uMsg, wParam, lParam);
}
BOOL sharedWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam, LRESULT *lResult)
{
switch (uMsg) {
case WM_COMMAND:
*lResult = forwardCommand(hwnd, uMsg, wParam, lParam);
return TRUE;
case WM_NOTIFY:
*lResult = forwardNotify(hwnd, uMsg, wParam, lParam);
return TRUE;
case WM_CTLCOLORSTATIC:
case WM_CTLCOLORBTN:
if (SetBkMode((HDC) wParam, TRANSPARENT) == 0)
xpanic("error setting transparent background mode to Labels", GetLastError());
paintControlBackground((HWND) lParam, (HDC) wParam);
*lResult = (LRESULT) hollowBrush;
return TRUE;
}
return FALSE;
}
void paintControlBackground(HWND hwnd, HDC dc)
{
HWND parent;
RECT r;
POINT p;
int saved;
WCHAR classname[128] = L""; // more than enough to avoid collisions
parent = hwnd;
do {
parent = GetParent(parent);
if (parent == NULL)
xpanic("error getting parent container of control in paintControlBackground()", GetLastError());
// wine sends these messages early, yay...
if (parent == msgwin)
return;
parent = GetParent(parent);
if (parent == NULL)
xpanic("error getting parent control of control in paintControlBackground()", GetLastError());
if (parent == msgwin)
return;
if (GetClassNameW(parent, classname, 128) == 0)
xpanic("error getting name of focused window class in paintControlBackground()", GetLastError());
} while (_wcsicmp(classname, L"button") == 0); // skip groupboxes
if (GetWindowRect(hwnd, &r) == 0)
xpanic("error getting control's window rect in paintControlBackground()", GetLastError());
// the above is a window rect; convert to client rect
p.x = r.left;
p.y = r.top;
if (ScreenToClient(parent, &p) == 0)
xpanic("error getting client origin of control in paintControlBackground()", GetLastError());
saved = SaveDC(dc);
if (saved == 0)
xpanic("error saving DC info in paintControlBackground()", GetLastError());
if (SetWindowOrgEx(dc, p.x, p.y, NULL) == 0)
xpanic("error moving window origin in paintControlBackground()", GetLastError());
SendMessageW(parent, WM_PRINTCLIENT, (WPARAM) dc, PRF_CLIENT);
if (RestoreDC(dc, saved) == 0)
xpanic("error restoring DC info in paintControlBackground()", GetLastError());
}

96
newctrl/container_windows.c Normal file
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@ -0,0 +1,96 @@
// 17 july 2014
#include "winapi_windows.h"
#include "_cgo_export.h"
/*
This could all just be part of Window, but doing so just makes things complex.
In this case, I chose to waste a window handle rather than keep things super complex.
If this is seriously an issue in the future, I can roll it back.
*/
#define containerclass L"gouicontainer"
static LRESULT CALLBACK containerWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
void *data;
RECT r;
LRESULT lResult;
data = getWindowData(hwnd, uMsg, wParam, lParam, &lResult);
if (data == NULL)
return lResult;
if (sharedWndProc(hwnd, uMsg, wParam, lParam, &lResult))
return lResult;
switch (uMsg) {
case WM_SIZE:
if (GetClientRect(hwnd, &r) == 0)
xpanic("error getting client rect for Window in WM_SIZE", GetLastError());
containerResize(data, &r);
return 0;
default:
return DefWindowProcW(hwnd, uMsg, wParam, lParam);
}
xmissedmsg("container", "containerWndProc()", uMsg);
return 0; // unreached
}
DWORD makeContainerWindowClass(char **errmsg)
{
WNDCLASSW wc;
ZeroMemory(&wc, sizeof (WNDCLASSW));
wc.lpfnWndProc = containerWndProc;
wc.hInstance = hInstance;
wc.hIcon = hDefaultIcon;
wc.hCursor = hArrowCursor;
wc.hbrBackground = NULL;//(HBRUSH) (COLOR_BTNFACE + 1);
wc.lpszClassName = containerclass;
if (RegisterClassW(&wc) == 0) {
*errmsg = "error registering container window class";
return GetLastError();
}
return 0;
}
HWND newContainer(void *data)
{
HWND hwnd;
hwnd = CreateWindowExW(
WS_EX_CONTROLPARENT | WS_EX_TRANSPARENT,
containerclass, L"",
WS_CHILD | WS_VISIBLE,
CW_USEDEFAULT, CW_USEDEFAULT,
100, 100,
msgwin, NULL, hInstance, data);
if (hwnd == NULL)
xpanic("container creation failed", GetLastError());
return hwnd;
}
void calculateBaseUnits(HWND hwnd, int *baseX, int *baseY, LONG *internalLeading)
{
HDC dc;
HFONT prevFont;
TEXTMETRICW tm;
SIZE size;
dc = GetDC(hwnd);
if (dc == NULL)
xpanic("error getting DC for preferred size calculations", GetLastError());
prevFont = (HFONT) SelectObject(dc, controlFont);
if (prevFont == NULL)
xpanic("error loading control font into device context for preferred size calculation", GetLastError());
if (GetTextMetricsW(dc, &tm) == 0)
xpanic("error getting text metrics for preferred size calculations", GetLastError());
if (GetTextExtentPoint32W(dc, L"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz", 52, &size) == 0)
xpanic("error getting text extent point for preferred size calculations", GetLastError());
*baseX = (int) ((size.cx / 26 + 1) / 2);
*baseY = (int) tm.tmHeight;
*internalLeading = tm.tmInternalLeading;
if (SelectObject(dc, prevFont) != controlFont)
xpanic("error restoring previous font into device context after preferred size calculations", GetLastError());
if (ReleaseDC(hwnd, dc) == 0)
xpanic("error releasing DC for preferred size calculations", GetLastError());
}

11
newctrl/container_windows.go
View File

@ -39,10 +39,7 @@ func makeContainerWindowClass() error {
func newContainer() *container {
c := new(container)
hwnd := C.newContainer(unsafe.Pointer(c))
if hwnd != c.hwnd {
panic(fmt.Errorf("inconsistency: hwnd returned by CreateWindowEx() (%p) and hwnd stored in container (%p) differ", hwnd, c.hwnd))
}
c.controlSingleHWND = newControlSingleHWND(C.newContainer(unsafe.Pointer(c)))
// don't set preferredSize(); it should never be called
return c
}
@ -61,12 +58,6 @@ func (c *container) parent() *controlParent {
return &controlParent{c.hwnd}
}
//export storeContainerHWND
func storeContainerHWND(data unsafe.Pointer, hwnd C.HWND) {
c := (*container)(data)
c.hwnd = hwnd
}
// For Windows, Microsoft just hands you a list of preferred control sizes as part of the MSDN documentation and tells you to roll with it.
// These sizes are given in "dialog units", which are independent of the font in use.
// We need to convert these into standard pixels, which requires we get the device context of the OS window.

154
newctrl/winapi_windows.h Normal file
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@ -0,0 +1,154 @@
// 17 july 2014
// cgo will include this file multiple times
#ifndef __GO_UI_WINAPI_WINDOWS_H__
#define __GO_UI_WINAPI_WINDOWS_H__
#define UNICODE
#define _UNICODE
#define STRICT
#define STRICT_TYPED_ITEMIDS
// get Windows version right; right now Windows XP
#define WINVER 0x0501
#define _WIN32_WINNT 0x0501
#define _WIN32_WINDOWS 0x0501 /* according to Microsoft's winperf.h */
#define _WIN32_IE 0x0600 /* according to Microsoft's sdkddkver.h */
#define NTDDI_VERSION 0x05010000 /* according to Microsoft's sdkddkver.h */
#include <windows.h>
#include <commctrl.h>
#include <stdint.h>
#include <uxtheme.h>
#include <string.h>
#include <wchar.h>
#include <windowsx.h>
#include <vsstyle.h>
#include <vssym32.h>
// global messages unique to everything
enum {
msgRequest = WM_APP + 1, // + 1 just to be safe
msgCOMMAND, // WM_COMMAND proxy; see forwardCommand() in controls_windows.go
msgNOTIFY, // WM_NOTIFY proxy
msgAreaSizeChanged,
msgAreaGetScroll,
msgAreaRepaint,
msgAreaRepaintAll,
msgTabCurrentTabHasChildren,
msgAreaKeyDown,
msgAreaKeyUp,
msgLoadImageList,
msgTableMakeInitialCheckboxImageList,
msgOpenFileDone,
};
// uitask_windows.c
extern void uimsgloop(void);
extern void issue(void *);
extern HWND msgwin;
extern DWORD makemsgwin(char **);
// comctl32_windows.c
extern DWORD initCommonControls(char **);
// these are listed as WINAPI in both Microsoft's and MinGW's headers, but not on MSDN for some reason
extern BOOL (*WINAPI fv_SetWindowSubclass)(HWND, SUBCLASSPROC, UINT_PTR, DWORD_PTR);
extern BOOL (*WINAPI fv_RemoveWindowSubclass)(HWND, SUBCLASSPROC, UINT_PTR);
extern LRESULT (*WINAPI fv_DefSubclassProc)(HWND, UINT, WPARAM, LPARAM);
extern HIMAGELIST (*WINAPI fv_ImageList_Create)(int, int, UINT, int, int);
extern int (*WINAPI fv_ImageList_Add)(HIMAGELIST, HBITMAP, HBITMAP);
extern BOOL (*WINAPI fv_ImageList_Destroy)(HIMAGELIST);
// control_windows.c
extern HWND newControl(LPWSTR, DWORD, DWORD);
extern void controlSetParent(HWND, HWND);
extern void controlSetControlFont(HWND);
extern void moveWindow(HWND, int, int, int, int);
extern LONG controlTextLength(HWND, LPWSTR);
// basicctrls_windows.c
extern void setButtonSubclass(HWND, void *);
extern void setCheckboxSubclass(HWND, void *);
extern BOOL checkboxChecked(HWND);
extern void checkboxSetChecked(HWND, BOOL);
#define textfieldStyle (ES_AUTOHSCROLL | ES_LEFT | ES_NOHIDESEL | WS_TABSTOP)
#define textfieldExtStyle (WS_EX_CLIENTEDGE)
extern void setTextFieldSubclass(HWND, void *);
extern void textfieldSetAndShowInvalidBalloonTip(HWND, WCHAR *);
extern void textfieldHideInvalidBalloonTip(HWND);
// init_windows.c
extern HINSTANCE hInstance;
extern int nCmdShow;
extern HICON hDefaultIcon;
extern HCURSOR hArrowCursor;
extern HFONT controlFont;
extern HFONT titleFont;
extern HFONT smallTitleFont;
extern HFONT menubarFont;
extern HFONT statusbarFont;
extern HBRUSH hollowBrush;
extern DWORD initWindows(char **);
// window_windows.c
extern DWORD makeWindowWindowClass(char **);
extern HWND newWindow(LPWSTR, int, int, void *);
extern void windowClose(HWND);
// common_windows.c
extern LRESULT getWindowTextLen(HWND);
extern void getWindowText(HWND, WPARAM, LPWSTR);
extern void setWindowText(HWND, LPWSTR);
extern void updateWindow(HWND);
extern void *getWindowData(HWND, UINT, WPARAM, LPARAM, LRESULT *);
extern BOOL sharedWndProc(HWND, UINT, WPARAM, LPARAM, LRESULT *);
extern void paintControlBackground(HWND, HDC);
// tab_windows.go
extern LPWSTR xWC_TABCONTROL;
extern void setTabSubclass(HWND, void *);
extern void tabAppend(HWND, LPWSTR);
extern void tabGetContentRect(HWND, RECT *);
extern LONG tabGetTabHeight(HWND);
extern void tabEnterChildren(HWND);
extern void tabLeaveChildren(HWND);
// table_windows.go
extern LPWSTR xWC_LISTVIEW;
extern void setTableSubclass(HWND, void *);
extern void tableAppendColumn(HWND, int, LPWSTR);
extern void tableUpdate(HWND, int);
extern void tableAddExtendedStyles(HWND, LPARAM);
extern void tableAutosizeColumns(HWND, int);
extern intptr_t tableSelectedItem(HWND);
extern void tableSelectItem(HWND, intptr_t);
// container_windows.c
extern DWORD makeContainerWindowClass(char **);
extern HWND newContainer(void *);
extern void calculateBaseUnits(HWND, int *, int *, LONG *);
// area_windows.c
#define areaWindowClass L"gouiarea"
extern void repaintArea(HWND, RECT *);
extern DWORD makeAreaWindowClass(char **);
extern HWND newArea(void *);
extern HWND newAreaTextField(HWND, void *);
extern void areaOpenTextField(HWND, HWND, int, int, int, int);
extern void areaMarkTextFieldDone(HWND);
// imagelist_windows.c
extern HBITMAP unscaledBitmap(void *, intptr_t, intptr_t);
extern HIMAGELIST newImageList(int, int);
extern void addImage(HIMAGELIST, HWND, HBITMAP, int, int, int, int);
extern void applyImageList(HWND, UINT, WPARAM, HIMAGELIST, HIMAGELIST);
enum {
checkboxStateChecked = 1 << 0,
checkboxStateHot = 1 << 1,
checkboxStatePushed = 1 << 2,
checkboxnStates = 1 << 3,
};
extern HIMAGELIST makeCheckboxImageList(HWND, HTHEME *);
// dialog_windows.c
extern void openFile(HWND, void *);
#endif

84
newctrl/window_windows.c Normal file
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@ -0,0 +1,84 @@
// 17 july 2014
#include "winapi_windows.h"
#include "_cgo_export.h"
#define windowclass L"gouiwindow"
#define windowBackground ((HBRUSH) (COLOR_BTNFACE + 1))
static LRESULT CALLBACK windowWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
void *data;
RECT r;
LRESULT lResult;
data = (void *) getWindowData(hwnd, uMsg, wParam, lParam, &lResult);
if (data == NULL)
return lResult;
if (sharedWndProc(hwnd, uMsg, wParam, lParam, &lResult))
return lResult;
switch (uMsg) {
case WM_PRINTCLIENT:
// the return value of this message is not documented
// just to be safe, do this first, returning its value later
lResult = DefWindowProcW(hwnd, uMsg, wParam, lParam);
if (GetClientRect(hwnd, &r) == 0)
xpanic("error getting client rect for Window in WM_PRINTCLIENT", GetLastError());
if (FillRect((HDC) wParam, &r, windowBackground) == 0)
xpanic("error filling WM_PRINTCLIENT DC with window background color", GetLastError());
return lResult;
case WM_SIZE:
if (GetClientRect(hwnd, &r) == 0)
xpanic("error getting client rect for Window in WM_SIZE", GetLastError());
windowResize(data, &r);
return 0;
case WM_CLOSE:
windowClosing(data);
return 0;
default:
return DefWindowProcW(hwnd, uMsg, wParam, lParam);
}
xmissedmsg("Window", "windowWndProc()", uMsg);
return 0; // unreached
}
DWORD makeWindowWindowClass(char **errmsg)
{
WNDCLASSW wc;
ZeroMemory(&wc, sizeof (WNDCLASSW));
wc.lpfnWndProc = windowWndProc;
wc.hInstance = hInstance;
wc.hIcon = hDefaultIcon;
wc.hCursor = hArrowCursor;
wc.hbrBackground = windowBackground;
wc.lpszClassName = windowclass;
if (RegisterClassW(&wc) == 0) {
*errmsg = "error registering Window window class";
return GetLastError();
}
return 0;
}
HWND newWindow(LPWSTR title, int width, int height, void *data)
{
HWND hwnd;
hwnd = CreateWindowExW(
0,
windowclass, title,
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
width, height,
NULL, NULL, hInstance, data);
if (hwnd == NULL)
xpanic("Window creation failed", GetLastError());
return hwnd;
}
void windowClose(HWND hwnd)
{
if (DestroyWindow(hwnd) == 0)
xpanic("error destroying window", GetLastError());
}

12
newctrl/window_windows.go
View File

@ -33,14 +33,10 @@ func makeWindowWindowClass() error {
func newWindow(title string, width int, height int, control Control) *window {
w := &window{
// hwnd set in WM_CREATE handler
closing: newEvent(),
child: control,
}
hwnd := C.newWindow(toUTF16(title), C.int(width), C.int(height), unsafe.Pointer(w))
if hwnd != w.hwnd {
panic(fmt.Errorf("inconsistency: hwnd returned by CreateWindowEx() (%p) and hwnd stored in Window (%p) differ", hwnd, w.hwnd))
}
w.hwnd = C.newWindow(toUTF16(title), C.int(width), C.int(height), unsafe.Pointer(w))
hresult := C.EnableThemeDialogTexture(w.hwnd, C.ETDT_ENABLE|C.ETDT_USETABTEXTURE)
if hresult != C.S_OK {
panic(fmt.Errorf("error setting tab background texture on Window; HRESULT: 0x%X", hresult))
@ -87,12 +83,6 @@ func (w *window) SetMargined(margined bool) {
w.margined = margined
}
//export storeWindowHWND
func storeWindowHWND(data unsafe.Pointer, hwnd C.HWND) {
w := (*window)(data)
w.hwnd = hwnd
}
//export windowResize
func windowResize(data unsafe.Pointer, r *C.RECT) {
w := (*window)(data)