Initial revision

1 files changed, 623 insertions, 0 deletions

diff --git a/generic/tkPointer.c b/generic/tkPointer.c
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+++ b/generic/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.
+ *
+ * SCCS: @(#) tkPointer.c 1.12 97/10/31 17:06:24
+ */
+
+#include "tkInt.h"
+
+#ifdef MAC_TCL
+#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])
+
+/*
+ * Declarations of static variables used in the pointer module.
+ */
+
+static TkWindow *cursorWinPtr = NULL;	/* Window that is currently
+					 * controlling the global cursor. */
+static TkWindow *grabWinPtr = NULL;	/* Window that defines the top of the
+					 * grab tree in a global grab. */
+static XPoint lastPos = { 0, 0};	/* Last reported mouse position. */
+static int lastState = 0;		/* Last known state flags. */
+static TkWindow *lastWinPtr = NULL;	/* Last reported mouse window. */
+static TkWindow *restrictWinPtr = NULL;	/* Window to which all mouse events
+					 * will be reported. */
+
+/*
+ * 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 */
+
+    if (winPtr != 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;
+	    }
+	}
+	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. */
+{
+    TkWindow *winPtr = (TkWindow *)tkwin;
+    TkWindow *targetWinPtr;
+    XPoint pos;
+    XEvent event;
+    int changes = (state ^ 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.
+     */
+
+    lastState = (state & ~ALL_BUTTONS) | (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, lastState)) {
+	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 (!restrictWinPtr) {
+		    if (!grabWinPtr) {
+
+			/*
+			 * Mouse is not grabbed, so set a button grab.
+			 */
+
+			restrictWinPtr = winPtr;
+			TkpSetCapture(restrictWinPtr);
+
+		    } else if ((lastState & ALL_BUTTONS) == 0) {
+
+			/*
+			 * Mouse is in a non-button grab, so ensure
+			 * the button grab is inside the grab tree.
+			 */
+
+			if (TkPositionInTree(winPtr, grabWinPtr)
+				== TK_GRAB_IN_TREE) {
+			    restrictWinPtr = winPtr;
+			} else {
+			    restrictWinPtr = grabWinPtr;
+			}
+			TkpSetCapture(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 ((lastState & ALL_BUTTONS) == mask) {
+		    if (!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 (restrictWinPtr) {
+		    InitializeEvent(&event, restrictWinPtr, type, x, y,
+			    lastState, b);
+		    Tk_QueueWindowEvent(&event, TCL_QUEUE_TAIL);
+		    lastState &= ~mask;
+		    lastWinPtr = restrictWinPtr;
+		    restrictWinPtr = NULL;
+
+		    GenerateEnterLeave(winPtr, x, y, lastState);
+		    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 (restrictWinPtr) {
+		targetWinPtr = restrictWinPtr;
+	    } else if (grabWinPtr && !winPtr) {
+		targetWinPtr = grabWinPtr;
+	    } else {
+		targetWinPtr = winPtr;
+	    }
+
+	    /*
+	     * If we still have a target window, send the event.
+	     */
+
+	    if (winPtr != NULL) {
+		InitializeEvent(&event, targetWinPtr, type, x, y,
+			lastState, b);
+		Tk_QueueWindowEvent(&event, TCL_QUEUE_TAIL);
+	    }
+
+	    /*
+	     * Update the state for the next iteration.
+	     */
+
+	    lastState = (type == ButtonPress)
+		? (lastState | mask) : (lastState & ~mask);
+	    lastPos = pos;
+	}
+    }
+
+    /*
+     * Make sure the cursor window is up to date.
+     */
+
+    if (restrictWinPtr) {
+	targetWinPtr = restrictWinPtr;
+    } else if (grabWinPtr) {
+	targetWinPtr = (TkPositionInTree(winPtr, grabWinPtr)
+		== TK_GRAB_IN_TREE) ? winPtr : grabWinPtr;
+    } else {
+	targetWinPtr = winPtr;
+    }
+    UpdateCursor(targetWinPtr);
+
+    /*
+     * If no other events caused the position to be updated,
+     * generate a motion event.
+     */
+
+    if (lastPos.x != pos.x || lastPos.y != pos.y) {
+	if (restrictWinPtr) {
+	    targetWinPtr = restrictWinPtr;
+	} else if (grabWinPtr && !winPtr) {
+	    targetWinPtr = grabWinPtr;
+	}
+
+	if (targetWinPtr != NULL) {
+	    InitializeEvent(&event, targetWinPtr, MotionNotify, x, y,
+		    lastState, NotifyNormal);
+	    Tk_QueueWindowEvent(&event, TCL_QUEUE_TAIL);
+	}
+	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;
+{
+    display->request++;
+    grabWinPtr = (TkWindow *) Tk_IdToWindow(display, grab_window);
+    restrictWinPtr = NULL;
+    TkpSetCapture(grabWinPtr);
+    if (TkPositionInTree(lastWinPtr, grabWinPtr) != TK_GRAB_IN_TREE) {
+	UpdateCursor(grabWinPtr);
+    }
+    return GrabSuccess;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * XUngrabPointer --
+ *
+ *	Release the current grab.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	Releases the mouse capture.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+XUngrabPointer(display, time)
+    Display* display;
+    Time time;
+{
+    display->request++;
+    grabWinPtr = NULL;
+    restrictWinPtr = NULL;
+    TkpSetCapture(NULL);
+    UpdateCursor(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;
+{
+    if (winPtr == lastWinPtr) {
+	lastWinPtr = NULL;
+    }
+    if (winPtr == grabWinPtr) {
+	grabWinPtr = NULL;
+    }
+    if (winPtr == restrictWinPtr) {
+	restrictWinPtr = NULL;
+    }
+    if (!(restrictWinPtr || 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;
+
+    /*
+     * A window inherits its cursor from its parent if it doesn't
+     * have one of its own.  Top level windows inherit the default
+     * cursor.
+     */
+
+    cursorWinPtr = winPtr;
+    while (winPtr != NULL) {
+	if (winPtr->atts.cursor != None) {
+	    cursor = winPtr->atts.cursor;
+	    break;
+	} else if (winPtr->flags & TK_TOP_LEVEL) {
+	    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);
+
+    if (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);
+    
+}