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/*

 * tkWinPointer.c --

 *

 *      Windows specific mouse tracking code.

 *

 * Copyright (c) 1995-1997 Sun Microsystems, Inc.

 *

 * See the file "license.terms" for information on usage and redistribution

 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.

 *

 * RCS: @(#) $Id: tkWinPointer.c,v 1.1.1.1 2002-01-16 10:26:03 markom Exp $

 */

#include "tkWinInt.h"

/*

 * Check for enter/leave events every MOUSE_TIMER_INTERVAL milliseconds.

 */

#define MOUSE_TIMER_INTERVAL 250

/*

 * Declarations of static variables used in this file.

 */

static int captured = 0;         /* 1 if mouse is currently captured. */

static TkWindow *keyboardWinPtr = NULL; /* Current keyboard grab window. */

static Tcl_TimerToken mouseTimer;       /* Handle to the latest mouse timer. */

static int mouseTimerSet = 0;            /* 1 if the mouse timer is active. */

/*

 * Forward declarations of procedures used in this file.

 */

static void             MouseTimerProc _ANSI_ARGS_((ClientData clientData));

/*

 *----------------------------------------------------------------------

 *

 * TkWinGetModifierState --

 *

 *      Return the modifier state as of the last message.

 *

 * Results:

 *      Returns the X modifier mask.

 *

 * Side effects:

 *      None.

 *

 *----------------------------------------------------------------------

 */

int

TkWinGetModifierState()

{

    int state = 0;

    if (GetKeyState(VK_SHIFT) & 0x8000) {

        state |= ShiftMask;

    }

    if (GetKeyState(VK_CONTROL) & 0x8000) {

        state |= ControlMask;

    }

    if (GetKeyState(VK_MENU) & 0x8000) {

        state |= Mod2Mask;

    }

    if (GetKeyState(VK_CAPITAL) & 0x0001) {

        state |= LockMask;

    }

    if (GetKeyState(VK_NUMLOCK) & 0x0001) {

        state |= Mod1Mask;

    }

    if (GetKeyState(VK_SCROLL) & 0x0001) {

        state |= Mod3Mask;

    }

    if (GetKeyState(VK_LBUTTON) & 0x8000) {

        state |= Button1Mask;

    }

    if (GetKeyState(VK_MBUTTON) & 0x8000) {

        state |= Button2Mask;

    }

    if (GetKeyState(VK_RBUTTON) & 0x8000) {

        state |= Button3Mask;

    }

    return state;

}

/*

 *----------------------------------------------------------------------

 *

 * Tk_PointerEvent --

 *

 *      This procedure is called for each pointer-related event.

 *      It converts the position to root coords and updates the

 *      global pointer state machine.  It also ensures that the

 *      mouse timer is scheduled.

 *

 * Results:

 *      None.

 *

 * Side effects:

 *      May queue events and change the grab state.

 *

 *----------------------------------------------------------------------

 */

void

Tk_PointerEvent(hwnd, x, y)

    HWND hwnd;                          /* Window for coords, or NULL for

                                         * the root window. */

    int x, y;                           /* Coords relative to hwnd, or screen

                                         * if hwnd is NULL. */

{

    POINT pos;

    int state;

    Tk_Window tkwin;

    pos.x = x;

    pos.y = y;

    /*

     * Convert client coords to root coords if we were given a window.

     */

    if (hwnd) {

        ClientToScreen(hwnd, &pos);

    }

    /*

     * If the mouse is captured, Windows will report all pointer

     * events to the capture window.  So, we need to determine which

     * window the mouse is really over and change the event.  Note

     * that the computed hwnd may point to a window not owned by Tk,

     * or a toplevel decorative frame, so tkwin can be NULL.

     */

    if (captured || hwnd == NULL) {

        hwnd = WindowFromPoint(pos);

    }

    tkwin = Tk_HWNDToWindow(hwnd);

    state = TkWinGetModifierState();

    Tk_UpdatePointer(tkwin, pos.x, pos.y, state);

    if ((captured || tkwin) && !mouseTimerSet) {

        mouseTimerSet = 1;

        mouseTimer = Tcl_CreateTimerHandler(MOUSE_TIMER_INTERVAL,

                MouseTimerProc, NULL);

    }

}

/*

 *----------------------------------------------------------------------

 *

 * XGrabKeyboard --

 *

 *      Simulates a keyboard grab by setting the focus.

 *

 * Results:

 *      Always returns GrabSuccess.

 *

 * Side effects:

 *      Sets the keyboard focus to the specified window.

 *

 *----------------------------------------------------------------------

 */

int

XGrabKeyboard(display, grab_window, owner_events, pointer_mode,

        keyboard_mode, time)

    Display* display;

    Window grab_window;

    Bool owner_events;

    int pointer_mode;

    int keyboard_mode;

    Time time;

{

    keyboardWinPtr = TkWinGetWinPtr(grab_window);

    return GrabSuccess;

}

/*

 *----------------------------------------------------------------------

 *

 * XUngrabKeyboard --

 *

 *      Releases the simulated keyboard grab.

 *

 * Results:

 *      None.

 *

 * Side effects:

 *      Sets the keyboard focus back to the value before the grab.

 *

 *----------------------------------------------------------------------

 */

void

XUngrabKeyboard(display, time)

    Display* display;

    Time time;

{

    keyboardWinPtr = NULL;

}

/*

 *----------------------------------------------------------------------

 *

 * MouseTimerProc --

 *

 *      Check the current mouse position and look for enter/leave

 *      events.

 *

 * Results:

 *      None.

 *

 * Side effects:

 *      May schedule a new timer and/or generate enter/leave events.

 *

 *----------------------------------------------------------------------

 */

void

MouseTimerProc(clientData)

    ClientData clientData;

{

    POINT pos;

    mouseTimerSet = 0;

    /*

     * Get the current mouse position and window.  Don't do anything

     * if the mouse hasn't moved since the last time we looked.

     */

    GetCursorPos(&pos);

    Tk_PointerEvent(NULL, pos.x, pos.y);

}

/* CYGNUS LOCAL: Cancel any current mouse timer.  */

void

TkWinCancelMouseTimer()

{

    if (mouseTimerSet) {

        Tcl_DeleteTimerHandler(mouseTimer);

        mouseTimerSet = 0;

    }

}

/*

 *----------------------------------------------------------------------

 *

 * TkGetPointerCoords --

 *

 *      Fetch the position of the mouse pointer.

 *

 * Results:

 *      *xPtr and *yPtr are filled in with the root coordinates

 *      of the mouse pointer for the display.

 *

 * Side effects:

 *      None.

 *

 *----------------------------------------------------------------------

 */

void

TkGetPointerCoords(tkwin, xPtr, yPtr)

    Tk_Window tkwin;            /* Window that identifies screen on which

                                 * lookup is to be done. */

    int *xPtr, *yPtr;           /* Store pointer coordinates here. */

{

    POINT point;

    GetCursorPos(&point);

    *xPtr = point.x;

    *yPtr = point.y;

}

/*

 *----------------------------------------------------------------------

 *

 * XQueryPointer --

 *

 *      Check the current state of the mouse.  This is not a complete

 *      implementation of this function.  It only computes the root

 *      coordinates and the current mask.

 *

 * Results:

 *      Sets root_x_return, root_y_return, and mask_return.  Returns

 *      true on success.

 *

 * Side effects:

 *      None.

 *

 *----------------------------------------------------------------------

 */

Bool

XQueryPointer(display, w, root_return, child_return, root_x_return,

        root_y_return, win_x_return, win_y_return, mask_return)

    Display* display;

    Window w;

    Window* root_return;

    Window* child_return;

    int* root_x_return;

    int* root_y_return;

    int* win_x_return;

    int* win_y_return;

    unsigned int* mask_return;

{

    display->request++;

    TkGetPointerCoords(NULL, root_x_return, root_y_return);

    *mask_return = TkWinGetModifierState();

    return True;

}

/*

 *----------------------------------------------------------------------

 *

 * XGetInputFocus --

 *

 *      Retrieves the current keyboard focus window.

 *

 * Results:

 *      Returns the current focus window.

 *

 * Side effects:

 *      None.

 *

 *----------------------------------------------------------------------

 */

void

XGetInputFocus(display, focus_return, revert_to_return)

    Display *display;

    Window *focus_return;

    int *revert_to_return;

{

    Tk_Window tkwin = Tk_HWNDToWindow(GetFocus());

    *focus_return = tkwin ? Tk_WindowId(tkwin) : None;

    *revert_to_return = RevertToParent;

    display->request++;

}

/*

 *----------------------------------------------------------------------

 *

 * XSetInputFocus --

 *

 *      Set the current focus window.

 *

 * Results:

 *      None.

 *

 * Side effects:

 *      Changes the keyboard focus and causes the selected window to

 *      be activated.

 *

 *----------------------------------------------------------------------

 */

void

XSetInputFocus(display, focus, revert_to, time)

    Display* display;

    Window focus;

    int revert_to;

    Time time;

{

    display->request++;

    if (focus != None) {

        SetFocus(Tk_GetHWND(focus));

    }

}

/*

 *----------------------------------------------------------------------

 *

 * TkpChangeFocus --

 *

 *      This procedure is invoked to move the system focus from

 *      one window to another.

 *

 * Results:

 *      The return value is the serial number of the command that

 *      changed the focus.  It may be needed by the caller to filter

 *      out focus change events that were queued before the command.

 *      If the procedure doesn't actually change the focus then

 *      it returns 0.

 *

 * Side effects:

 *      The official Windows focus window changes;  the application's focus

 *      window isn't changed by this procedure.

 *

 *----------------------------------------------------------------------

 */

int

TkpChangeFocus(winPtr, force)

    TkWindow *winPtr;           /* Window that is to receive the X focus. */

    int force;                  /* Non-zero means claim the focus even

                                 * if it didn't originally belong to

                                 * topLevelPtr's application. */

{

    TkDisplay *dispPtr = winPtr->dispPtr;

    Window focusWindow;

    int dummy, serial;

    TkWindow *winPtr2;

    if (!force) {

        XGetInputFocus(dispPtr->display, &focusWindow, &dummy);

        winPtr2 = (TkWindow *) Tk_IdToWindow(dispPtr->display, focusWindow);

        if ((winPtr2 == NULL) || (winPtr2->mainPtr != winPtr->mainPtr)) {

            return 0;

        }

    }

    if (winPtr->window == None) {

        panic("ChangeXFocus got null X window");

    }

    /*

     * Change the foreground window so the focus window is raised to the top of

     * the system stacking order and gets the keyboard focus.

     */

    if (force) {

        SetForegroundWindow(Tk_GetHWND(winPtr->window));

    }

    XSetInputFocus(dispPtr->display, winPtr->window, RevertToParent,

            CurrentTime);

    /*

     * Remember the current serial number for the X server and issue

     * a dummy server request.  This marks the position at which we

     * changed the focus, so we can distinguish FocusIn and FocusOut

     * events on either side of the mark.

     */

    serial = NextRequest(winPtr->display);

    XNoOp(winPtr->display);

    return serial;

}

/*

 *----------------------------------------------------------------------

 *

 * TkpSetCapture --

 *

 *      This function captures the mouse so that all future events

 *      will be reported to this window, even if the mouse is outside

 *      the window.  If the specified window is NULL, then the mouse

 *      is released.

 *

 * Results:

 *      None.

 *

 * Side effects:

 *      Sets the capture flag and captures the mouse.

 *

 *----------------------------------------------------------------------

 */

void

TkpSetCapture(winPtr)

    TkWindow *winPtr;                   /* Capture window, or NULL. */

{

    if (winPtr) {

        SetCapture(Tk_GetHWND(Tk_WindowId(winPtr)));

        captured = 1;

    } else {

        captured = 0;

        ReleaseCapture();

    }

}