tkPointer.c
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- /*
- * tkPointer.c --
- *
- * This file contains functions for emulating the X server
- * pointer and grab state machine. This file is used by the
- * Mac and Windows platforms to generate appropriate enter/leave
- * events, and to update the global grab window information.
- *
- * Copyright (c) 1996 by 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: tkPointer.c,v 1.7 2002/08/31 06:12:25 das Exp $
- */
- #include "tkInt.h"
- #ifdef __WIN32__
- #include "tkWinInt.h"
- #endif
- #if defined(MAC_TCL)
- #include "tkMacInt.h"
- #define Cursor XCursor
- #endif
- #if defined(MAC_OSX_TK)
- #include "tkMacOSXInt.h"
- #define Cursor XCursor
- #endif
- /*
- * Mask that selects any of the state bits corresponding to buttons,
- * plus masks that select individual buttons' bits:
- */
- #define ALL_BUTTONS
- (Button1Mask|Button2Mask|Button3Mask|Button4Mask|Button5Mask)
- static unsigned int buttonMasks[] = {
- Button1Mask, Button2Mask, Button3Mask, Button4Mask, Button5Mask
- };
- #define ButtonMask(b) (buttonMasks[(b)-Button1])
- typedef struct ThreadSpecificData {
- TkWindow *grabWinPtr; /* Window that defines the top of the
- * grab tree in a global grab. */
- int lastState; /* Last known state flags. */
- XPoint lastPos; /* Last reported mouse position. */
- TkWindow *lastWinPtr; /* Last reported mouse window. */
- TkWindow *restrictWinPtr; /* Window to which all mouse events
- * will be reported. */
- TkWindow *cursorWinPtr; /* Window that is currently
- * controlling the global cursor. */
- } ThreadSpecificData;
- static Tcl_ThreadDataKey dataKey;
- /*
- * Forward declarations of procedures used in this file.
- */
- static int GenerateEnterLeave _ANSI_ARGS_((TkWindow *winPtr,
- int x, int y, int state));
- static void InitializeEvent _ANSI_ARGS_((XEvent* eventPtr,
- TkWindow *winPtr, int type, int x, int y,
- int state, int detail));
- static void UpdateCursor _ANSI_ARGS_((TkWindow *winPtr));
- /*
- *----------------------------------------------------------------------
- *
- * InitializeEvent --
- *
- * Initializes the common fields for several X events.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Fills in the specified event structure.
- *
- *----------------------------------------------------------------------
- */
- static void
- InitializeEvent(eventPtr, winPtr, type, x, y, state, detail)
- XEvent* eventPtr; /* Event structure to initialize. */
- TkWindow *winPtr; /* Window to make event relative to. */
- int type; /* Message type. */
- int x, y; /* Root coords of event. */
- int state; /* State flags. */
- int detail; /* Detail value. */
- {
- eventPtr->type = type;
- eventPtr->xany.serial = LastKnownRequestProcessed(winPtr->display);
- eventPtr->xany.send_event = False;
- eventPtr->xany.display = winPtr->display;
- eventPtr->xcrossing.root = RootWindow(winPtr->display, winPtr->screenNum);
- eventPtr->xcrossing.time = TkpGetMS();
- eventPtr->xcrossing.x_root = x;
- eventPtr->xcrossing.y_root = y;
- switch (type) {
- case EnterNotify:
- case LeaveNotify:
- eventPtr->xcrossing.mode = NotifyNormal;
- eventPtr->xcrossing.state = state;
- eventPtr->xcrossing.detail = detail;
- eventPtr->xcrossing.focus = False;
- break;
- case MotionNotify:
- eventPtr->xmotion.state = state;
- eventPtr->xmotion.is_hint = detail;
- break;
- case ButtonPress:
- case ButtonRelease:
- eventPtr->xbutton.state = state;
- eventPtr->xbutton.button = detail;
- break;
- }
- TkChangeEventWindow(eventPtr, winPtr);
- }
- /*
- *----------------------------------------------------------------------
- *
- * GenerateEnterLeave --
- *
- * Update the current mouse window and position, and generate
- * any enter/leave events that are needed.
- *
- * Results:
- * Returns 1 if enter/leave events were generated.
- *
- * Side effects:
- * May insert events into the Tk event queue.
- *
- *----------------------------------------------------------------------
- */
- static int
- GenerateEnterLeave(winPtr, x, y, state)
- TkWindow *winPtr; /* Current Tk window (or NULL). */
- int x,y; /* Current mouse position in root coords. */
- int state; /* State flags. */
- {
- int crossed = 0; /* 1 if mouse crossed a window boundary */
- ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
- Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
- TkWindow *restrictWinPtr = tsdPtr->restrictWinPtr;
- TkWindow *lastWinPtr = tsdPtr->lastWinPtr;
- if (winPtr != tsdPtr->lastWinPtr) {
- if (restrictWinPtr) {
- int newPos, oldPos;
- newPos = TkPositionInTree(winPtr, restrictWinPtr);
- oldPos = TkPositionInTree(lastWinPtr, restrictWinPtr);
- /*
- * Check if the mouse crossed into or out of the restrict
- * window. If so, we need to generate an Enter or Leave event.
- */
- if ((newPos != oldPos) && ((newPos == TK_GRAB_IN_TREE)
- || (oldPos == TK_GRAB_IN_TREE))) {
- XEvent event;
- int type, detail;
- if (newPos == TK_GRAB_IN_TREE) {
- type = EnterNotify;
- } else {
- type = LeaveNotify;
- }
- if ((oldPos == TK_GRAB_ANCESTOR)
- || (newPos == TK_GRAB_ANCESTOR)) {
- detail = NotifyAncestor;
- } else {
- detail = NotifyVirtual;
- }
- InitializeEvent(&event, restrictWinPtr, type, x, y,
- state, detail);
- Tk_QueueWindowEvent(&event, TCL_QUEUE_TAIL);
- }
- } else {
- TkWindow *targetPtr;
- if ((lastWinPtr == NULL)
- || (lastWinPtr->window == None)) {
- targetPtr = winPtr;
- } else {
- targetPtr = lastWinPtr;
- }
- if (targetPtr && (targetPtr->window != None)) {
- XEvent event;
- /*
- * Generate appropriate Enter/Leave events.
- */
- InitializeEvent(&event, targetPtr, LeaveNotify, x, y, state,
- NotifyNormal);
- TkInOutEvents(&event, lastWinPtr, winPtr, LeaveNotify,
- EnterNotify, TCL_QUEUE_TAIL);
- crossed = 1;
- }
- }
- tsdPtr->lastWinPtr = winPtr;
- }
- return crossed;
- }
- /*
- *----------------------------------------------------------------------
- *
- * Tk_UpdatePointer --
- *
- * This function updates the pointer state machine given an
- * the current window, position and modifier state.
- *
- * Results:
- * None.
- *
- * Side effects:
- * May queue new events and update the grab state.
- *
- *----------------------------------------------------------------------
- */
- void
- Tk_UpdatePointer(tkwin, x, y, state)
- Tk_Window tkwin; /* Window to which pointer event
- * is reported. May be NULL. */
- int x, y; /* Pointer location in root coords. */
- int state; /* Modifier state mask. */
- {
- ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
- Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
- TkWindow *winPtr = (TkWindow *)tkwin;
- TkWindow *targetWinPtr;
- XPoint pos;
- XEvent event;
- int changes = (state ^ tsdPtr->lastState) & ALL_BUTTONS;
- int type, b, mask;
- pos.x = x;
- pos.y = y;
- /*
- * Use the current keyboard state, but the old mouse button
- * state since we haven't generated the button events yet.
- */
- tsdPtr->lastState = (state & ~ALL_BUTTONS) | (tsdPtr->lastState
- & ALL_BUTTONS);
- /*
- * Generate Enter/Leave events. If the pointer has crossed window
- * boundaries, update the current mouse position so we don't generate
- * redundant motion events.
- */
- if (GenerateEnterLeave(winPtr, x, y, tsdPtr->lastState)) {
- tsdPtr->lastPos = pos;
- }
- /*
- * Generate ButtonPress/ButtonRelease events based on the differences
- * between the current button state and the last known button state.
- */
- for (b = Button1; b <= Button3; b++) {
- mask = ButtonMask(b);
- if (changes & mask) {
- if (state & mask) {
- type = ButtonPress;
- /*
- * ButtonPress - Set restrict window if we aren't grabbed, or
- * if this is the first button down.
- */
- if (!tsdPtr->restrictWinPtr) {
- if (!tsdPtr->grabWinPtr) {
- /*
- * Mouse is not grabbed, so set a button grab.
- */
- tsdPtr->restrictWinPtr = winPtr;
- TkpSetCapture(tsdPtr->restrictWinPtr);
- } else if ((tsdPtr->lastState & ALL_BUTTONS) == 0) {
- /*
- * Mouse is in a non-button grab, so ensure
- * the button grab is inside the grab tree.
- */
- if (TkPositionInTree(winPtr, tsdPtr->grabWinPtr)
- == TK_GRAB_IN_TREE) {
- tsdPtr->restrictWinPtr = winPtr;
- } else {
- tsdPtr->restrictWinPtr = tsdPtr->grabWinPtr;
- }
- TkpSetCapture(tsdPtr->restrictWinPtr);
- }
- }
- } else {
- type = ButtonRelease;
- /*
- * ButtonRelease - Release the mouse capture and clear the
- * restrict window when the last button is released and we
- * aren't in a global grab.
- */
- if ((tsdPtr->lastState & ALL_BUTTONS) == mask) {
- if (!tsdPtr->grabWinPtr) {
- TkpSetCapture(NULL);
- }
- }
- /*
- * If we are releasing a restrict window, then we need
- * to send the button event followed by mouse motion from
- * the restrict window to the current mouse position.
- */
- if (tsdPtr->restrictWinPtr) {
- InitializeEvent(&event, tsdPtr->restrictWinPtr, type, x, y,
- tsdPtr->lastState, b);
- Tk_QueueWindowEvent(&event, TCL_QUEUE_TAIL);
- tsdPtr->lastState &= ~mask;
- tsdPtr->lastWinPtr = tsdPtr->restrictWinPtr;
- tsdPtr->restrictWinPtr = NULL;
- GenerateEnterLeave(winPtr, x, y, tsdPtr->lastState);
- tsdPtr->lastPos = pos;
- continue;
- }
- }
- /*
- * If a restrict window is set, make sure the pointer event
- * is reported relative to that window. Otherwise, if a
- * global grab is in effect then events outside of windows
- * managed by Tk should be reported to the grab window.
- */
- if (tsdPtr->restrictWinPtr) {
- targetWinPtr = tsdPtr->restrictWinPtr;
- } else if (tsdPtr->grabWinPtr && !winPtr) {
- targetWinPtr = tsdPtr->grabWinPtr;
- } else {
- targetWinPtr = winPtr;
- }
- /*
- * If we still have a target window, send the event.
- */
- if (winPtr != NULL) {
- InitializeEvent(&event, targetWinPtr, type, x, y,
- tsdPtr->lastState, b);
- Tk_QueueWindowEvent(&event, TCL_QUEUE_TAIL);
- }
- /*
- * Update the state for the next iteration.
- */
- tsdPtr->lastState = (type == ButtonPress)
- ? (tsdPtr->lastState | mask) : (tsdPtr->lastState & ~mask);
- tsdPtr->lastPos = pos;
- }
- }
- /*
- * Make sure the cursor window is up to date.
- */
- if (tsdPtr->restrictWinPtr) {
- targetWinPtr = tsdPtr->restrictWinPtr;
- } else if (tsdPtr->grabWinPtr) {
- targetWinPtr = (TkPositionInTree(winPtr, tsdPtr->grabWinPtr)
- == TK_GRAB_IN_TREE) ? winPtr : tsdPtr->grabWinPtr;
- } else {
- targetWinPtr = winPtr;
- }
- UpdateCursor(targetWinPtr);
- /*
- * If no other events caused the position to be updated,
- * generate a motion event.
- */
- if (tsdPtr->lastPos.x != pos.x || tsdPtr->lastPos.y != pos.y) {
- if (tsdPtr->restrictWinPtr) {
- targetWinPtr = tsdPtr->restrictWinPtr;
- } else if (tsdPtr->grabWinPtr && !winPtr) {
- targetWinPtr = tsdPtr->grabWinPtr;
- }
- if (targetWinPtr != NULL) {
- InitializeEvent(&event, targetWinPtr, MotionNotify, x, y,
- tsdPtr->lastState, NotifyNormal);
- Tk_QueueWindowEvent(&event, TCL_QUEUE_TAIL);
- }
- tsdPtr->lastPos = pos;
- }
- }
- /*
- *----------------------------------------------------------------------
- *
- * XGrabPointer --
- *
- * Capture the mouse so event are reported outside of toplevels.
- * Note that this is a very limited implementation that only
- * supports GrabModeAsync and owner_events True.
- *
- * Results:
- * Always returns GrabSuccess.
- *
- * Side effects:
- * Turns on mouse capture, sets the global grab pointer, and
- * clears any window restrictions.
- *
- *----------------------------------------------------------------------
- */
- int
- XGrabPointer(display, grab_window, owner_events, event_mask, pointer_mode,
- keyboard_mode, confine_to, cursor, time)
- Display* display;
- Window grab_window;
- Bool owner_events;
- unsigned int event_mask;
- int pointer_mode;
- int keyboard_mode;
- Window confine_to;
- Cursor cursor;
- Time time;
- {
- ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
- Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
- display->request++;
- tsdPtr->grabWinPtr = (TkWindow *) Tk_IdToWindow(display, grab_window);
- tsdPtr->restrictWinPtr = NULL;
- TkpSetCapture(tsdPtr->grabWinPtr);
- if (TkPositionInTree(tsdPtr->lastWinPtr, tsdPtr->grabWinPtr)
- != TK_GRAB_IN_TREE) {
- UpdateCursor(tsdPtr->grabWinPtr);
- }
- return GrabSuccess;
- }
- /*
- *----------------------------------------------------------------------
- *
- * XUngrabPointer --
- *
- * Release the current grab.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Releases the mouse capture.
- *
- *----------------------------------------------------------------------
- */
- void
- XUngrabPointer(display, time)
- Display* display;
- Time time;
- {
- ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
- Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
- display->request++;
- tsdPtr->grabWinPtr = NULL;
- tsdPtr->restrictWinPtr = NULL;
- TkpSetCapture(NULL);
- UpdateCursor(tsdPtr->lastWinPtr);
- }
- /*
- *----------------------------------------------------------------------
- *
- * TkPointerDeadWindow --
- *
- * Clean up pointer module state when a window is destroyed.
- *
- * Results:
- * None.
- *
- * Side effects:
- * May release the current capture window.
- *
- *----------------------------------------------------------------------
- */
- void
- TkPointerDeadWindow(winPtr)
- TkWindow *winPtr;
- {
- ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
- Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
- if (winPtr == tsdPtr->lastWinPtr) {
- tsdPtr->lastWinPtr = NULL;
- }
- if (winPtr == tsdPtr->grabWinPtr) {
- tsdPtr->grabWinPtr = NULL;
- }
- if (winPtr == tsdPtr->restrictWinPtr) {
- tsdPtr->restrictWinPtr = NULL;
- }
- if (!(tsdPtr->restrictWinPtr || tsdPtr->grabWinPtr)) {
- TkpSetCapture(NULL);
- }
- }
- /*
- *----------------------------------------------------------------------
- *
- * UpdateCursor --
- *
- * Set the windows global cursor to the cursor associated with
- * the given Tk window.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Changes the mouse cursor.
- *
- *----------------------------------------------------------------------
- */
- static void
- UpdateCursor(winPtr)
- TkWindow *winPtr;
- {
- Cursor cursor = None;
- ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
- Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
- /*
- * A window inherits its cursor from its parent if it doesn't
- * have one of its own. Top level windows inherit the default
- * cursor.
- */
- tsdPtr->cursorWinPtr = winPtr;
- while (winPtr != NULL) {
- if (winPtr->atts.cursor != None) {
- cursor = winPtr->atts.cursor;
- break;
- } else if (winPtr->flags & TK_TOP_HIERARCHY) {
- break;
- }
- winPtr = winPtr->parentPtr;
- }
- TkpSetCursor((TkpCursor) cursor);
- }
- /*
- *----------------------------------------------------------------------
- *
- * XDefineCursor --
- *
- * This function is called to update the cursor on a window.
- * Since the mouse might be in the specified window, we need to
- * check the specified window against the current mouse position
- * and grab state.
- *
- * Results:
- * None.
- *
- * Side effects:
- * May update the cursor.
- *
- *----------------------------------------------------------------------
- */
- void
- XDefineCursor(display, w, cursor)
- Display* display;
- Window w;
- Cursor cursor;
- {
- TkWindow *winPtr = (TkWindow *)Tk_IdToWindow(display, w);
- ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
- Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
- if (tsdPtr->cursorWinPtr == winPtr) {
- UpdateCursor(winPtr);
- }
- display->request++;
- }
- /*
- *----------------------------------------------------------------------
- *
- * TkGenerateActivateEvents --
- *
- * This function is called by the Mac and Windows window manager
- * routines when a toplevel window is activated or deactivated.
- * Activate/Deactivate events will be sent to every subwindow of
- * the toplevel followed by a FocusIn/FocusOut message.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Generates X events.
- *
- *----------------------------------------------------------------------
- */
- void
- TkGenerateActivateEvents(winPtr, active)
- TkWindow *winPtr; /* Toplevel to activate. */
- int active; /* Non-zero if the window is being
- * activated, else 0.*/
- {
- XEvent event;
-
- /*
- * Generate Activate and Deactivate events. This event
- * is sent to every subwindow in a toplevel window.
- */
- event.xany.serial = winPtr->display->request++;
- event.xany.send_event = False;
- event.xany.display = winPtr->display;
- event.xany.window = winPtr->window;
- event.xany.type = active ? ActivateNotify : DeactivateNotify;
- TkQueueEventForAllChildren(winPtr, &event);
-
- }