624 lines
15 KiB
C
624 lines
15 KiB
C
/*
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* tkPointer.c --
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*
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* This file contains functions for emulating the X server
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* pointer and grab state machine. This file is used by the
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* Mac and Windows platforms to generate appropriate enter/leave
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* events, and to update the global grab window information.
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*
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* Copyright (c) 1996 by Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tkPointer.c 1.12 97/10/31 17:06:24
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*/
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#include "tkInt.h"
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#ifdef MAC_TCL
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#define Cursor XCursor
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#endif
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/*
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* Mask that selects any of the state bits corresponding to buttons,
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* plus masks that select individual buttons' bits:
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*/
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#define ALL_BUTTONS \
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(Button1Mask|Button2Mask|Button3Mask|Button4Mask|Button5Mask)
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static unsigned int buttonMasks[] = {
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Button1Mask, Button2Mask, Button3Mask, Button4Mask, Button5Mask
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};
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#define ButtonMask(b) (buttonMasks[(b)-Button1])
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/*
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* Declarations of static variables used in the pointer module.
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*/
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static TkWindow *cursorWinPtr = NULL; /* Window that is currently
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* controlling the global cursor. */
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static TkWindow *grabWinPtr = NULL; /* Window that defines the top of the
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* grab tree in a global grab. */
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static XPoint lastPos = { 0, 0}; /* Last reported mouse position. */
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static int lastState = 0; /* Last known state flags. */
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static TkWindow *lastWinPtr = NULL; /* Last reported mouse window. */
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static TkWindow *restrictWinPtr = NULL; /* Window to which all mouse events
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* will be reported. */
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/*
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* Forward declarations of procedures used in this file.
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*/
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static int GenerateEnterLeave _ANSI_ARGS_((TkWindow *winPtr,
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int x, int y, int state));
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static void InitializeEvent _ANSI_ARGS_((XEvent* eventPtr,
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TkWindow *winPtr, int type, int x, int y,
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int state, int detail));
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static void UpdateCursor _ANSI_ARGS_((TkWindow *winPtr));
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/*
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*----------------------------------------------------------------------
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*
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* InitializeEvent --
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*
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* Initializes the common fields for several X events.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Fills in the specified event structure.
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*
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*----------------------------------------------------------------------
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*/
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static void
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InitializeEvent(eventPtr, winPtr, type, x, y, state, detail)
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XEvent* eventPtr; /* Event structure to initialize. */
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TkWindow *winPtr; /* Window to make event relative to. */
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int type; /* Message type. */
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int x, y; /* Root coords of event. */
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int state; /* State flags. */
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int detail; /* Detail value. */
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{
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eventPtr->type = type;
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eventPtr->xany.serial = LastKnownRequestProcessed(winPtr->display);
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eventPtr->xany.send_event = False;
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eventPtr->xany.display = winPtr->display;
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eventPtr->xcrossing.root = RootWindow(winPtr->display, winPtr->screenNum);
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eventPtr->xcrossing.time = TkpGetMS();
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eventPtr->xcrossing.x_root = x;
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eventPtr->xcrossing.y_root = y;
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switch (type) {
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case EnterNotify:
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case LeaveNotify:
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eventPtr->xcrossing.mode = NotifyNormal;
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eventPtr->xcrossing.state = state;
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eventPtr->xcrossing.detail = detail;
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eventPtr->xcrossing.focus = False;
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break;
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case MotionNotify:
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eventPtr->xmotion.state = state;
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eventPtr->xmotion.is_hint = detail;
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break;
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case ButtonPress:
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case ButtonRelease:
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eventPtr->xbutton.state = state;
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eventPtr->xbutton.button = detail;
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break;
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}
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TkChangeEventWindow(eventPtr, winPtr);
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}
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/*
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*----------------------------------------------------------------------
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*
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* GenerateEnterLeave --
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*
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* Update the current mouse window and position, and generate
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* any enter/leave events that are needed.
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*
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* Results:
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* Returns 1 if enter/leave events were generated.
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*
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* Side effects:
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* May insert events into the Tk event queue.
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*
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*----------------------------------------------------------------------
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*/
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static int
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GenerateEnterLeave(winPtr, x, y, state)
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TkWindow *winPtr; /* Current Tk window (or NULL). */
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int x,y; /* Current mouse position in root coords. */
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int state; /* State flags. */
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{
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int crossed = 0; /* 1 if mouse crossed a window boundary */
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if (winPtr != lastWinPtr) {
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if (restrictWinPtr) {
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int newPos, oldPos;
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newPos = TkPositionInTree(winPtr, restrictWinPtr);
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oldPos = TkPositionInTree(lastWinPtr, restrictWinPtr);
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/*
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* Check if the mouse crossed into or out of the restrict
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* window. If so, we need to generate an Enter or Leave event.
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*/
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if ((newPos != oldPos) && ((newPos == TK_GRAB_IN_TREE)
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|| (oldPos == TK_GRAB_IN_TREE))) {
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XEvent event;
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int type, detail;
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if (newPos == TK_GRAB_IN_TREE) {
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type = EnterNotify;
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} else {
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type = LeaveNotify;
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}
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if ((oldPos == TK_GRAB_ANCESTOR)
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|| (newPos == TK_GRAB_ANCESTOR)) {
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detail = NotifyAncestor;
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} else {
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detail = NotifyVirtual;
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}
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InitializeEvent(&event, restrictWinPtr, type, x, y,
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state, detail);
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Tk_QueueWindowEvent(&event, TCL_QUEUE_TAIL);
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}
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} else {
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TkWindow *targetPtr;
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if ((lastWinPtr == NULL)
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|| (lastWinPtr->window == None)) {
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targetPtr = winPtr;
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} else {
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targetPtr = lastWinPtr;
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}
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if (targetPtr && (targetPtr->window != None)) {
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XEvent event;
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/*
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* Generate appropriate Enter/Leave events.
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*/
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InitializeEvent(&event, targetPtr, LeaveNotify, x, y, state,
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NotifyNormal);
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TkInOutEvents(&event, lastWinPtr, winPtr, LeaveNotify,
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EnterNotify, TCL_QUEUE_TAIL);
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crossed = 1;
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}
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}
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lastWinPtr = winPtr;
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}
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return crossed;
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tk_UpdatePointer --
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*
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* This function updates the pointer state machine given an
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* the current window, position and modifier state.
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*
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* Results:
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* None.
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*
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* Side effects:
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* May queue new events and update the grab state.
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*
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*----------------------------------------------------------------------
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*/
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void
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Tk_UpdatePointer(tkwin, x, y, state)
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Tk_Window tkwin; /* Window to which pointer event
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* is reported. May be NULL. */
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int x, y; /* Pointer location in root coords. */
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int state; /* Modifier state mask. */
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{
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TkWindow *winPtr = (TkWindow *)tkwin;
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TkWindow *targetWinPtr;
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XPoint pos;
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XEvent event;
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int changes = (state ^ lastState) & ALL_BUTTONS;
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int type, b, mask;
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pos.x = x;
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pos.y = y;
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/*
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* Use the current keyboard state, but the old mouse button
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* state since we haven't generated the button events yet.
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*/
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lastState = (state & ~ALL_BUTTONS) | (lastState & ALL_BUTTONS);
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/*
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* Generate Enter/Leave events. If the pointer has crossed window
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* boundaries, update the current mouse position so we don't generate
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* redundant motion events.
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*/
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if (GenerateEnterLeave(winPtr, x, y, lastState)) {
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lastPos = pos;
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}
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/*
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* Generate ButtonPress/ButtonRelease events based on the differences
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* between the current button state and the last known button state.
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*/
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for (b = Button1; b <= Button3; b++) {
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mask = ButtonMask(b);
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if (changes & mask) {
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if (state & mask) {
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type = ButtonPress;
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/*
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* ButtonPress - Set restrict window if we aren't grabbed, or
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* if this is the first button down.
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*/
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if (!restrictWinPtr) {
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if (!grabWinPtr) {
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/*
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* Mouse is not grabbed, so set a button grab.
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*/
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restrictWinPtr = winPtr;
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TkpSetCapture(restrictWinPtr);
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} else if ((lastState & ALL_BUTTONS) == 0) {
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/*
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* Mouse is in a non-button grab, so ensure
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* the button grab is inside the grab tree.
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*/
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if (TkPositionInTree(winPtr, grabWinPtr)
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== TK_GRAB_IN_TREE) {
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restrictWinPtr = winPtr;
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} else {
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restrictWinPtr = grabWinPtr;
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}
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TkpSetCapture(restrictWinPtr);
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}
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}
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} else {
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type = ButtonRelease;
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/*
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* ButtonRelease - Release the mouse capture and clear the
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* restrict window when the last button is released and we
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* aren't in a global grab.
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*/
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if ((lastState & ALL_BUTTONS) == mask) {
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if (!grabWinPtr) {
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TkpSetCapture(NULL);
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}
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}
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/*
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* If we are releasing a restrict window, then we need
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* to send the button event followed by mouse motion from
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* the restrict window to the current mouse position.
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*/
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if (restrictWinPtr) {
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InitializeEvent(&event, restrictWinPtr, type, x, y,
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lastState, b);
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Tk_QueueWindowEvent(&event, TCL_QUEUE_TAIL);
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lastState &= ~mask;
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lastWinPtr = restrictWinPtr;
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restrictWinPtr = NULL;
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GenerateEnterLeave(winPtr, x, y, lastState);
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lastPos = pos;
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continue;
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}
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}
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/*
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* If a restrict window is set, make sure the pointer event
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* is reported relative to that window. Otherwise, if a
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* global grab is in effect then events outside of windows
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* managed by Tk should be reported to the grab window.
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*/
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if (restrictWinPtr) {
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targetWinPtr = restrictWinPtr;
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} else if (grabWinPtr && !winPtr) {
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targetWinPtr = grabWinPtr;
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} else {
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targetWinPtr = winPtr;
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}
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/*
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* If we still have a target window, send the event.
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*/
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if (winPtr != NULL) {
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InitializeEvent(&event, targetWinPtr, type, x, y,
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lastState, b);
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Tk_QueueWindowEvent(&event, TCL_QUEUE_TAIL);
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}
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/*
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* Update the state for the next iteration.
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*/
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lastState = (type == ButtonPress)
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? (lastState | mask) : (lastState & ~mask);
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lastPos = pos;
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}
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}
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/*
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* Make sure the cursor window is up to date.
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*/
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if (restrictWinPtr) {
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targetWinPtr = restrictWinPtr;
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} else if (grabWinPtr) {
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targetWinPtr = (TkPositionInTree(winPtr, grabWinPtr)
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== TK_GRAB_IN_TREE) ? winPtr : grabWinPtr;
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} else {
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targetWinPtr = winPtr;
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}
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UpdateCursor(targetWinPtr);
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/*
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* If no other events caused the position to be updated,
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* generate a motion event.
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*/
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if (lastPos.x != pos.x || lastPos.y != pos.y) {
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if (restrictWinPtr) {
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targetWinPtr = restrictWinPtr;
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} else if (grabWinPtr && !winPtr) {
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targetWinPtr = grabWinPtr;
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}
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if (targetWinPtr != NULL) {
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InitializeEvent(&event, targetWinPtr, MotionNotify, x, y,
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lastState, NotifyNormal);
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Tk_QueueWindowEvent(&event, TCL_QUEUE_TAIL);
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}
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lastPos = pos;
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}
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}
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/*
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*----------------------------------------------------------------------
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*
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* XGrabPointer --
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*
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* Capture the mouse so event are reported outside of toplevels.
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* Note that this is a very limited implementation that only
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* supports GrabModeAsync and owner_events True.
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*
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* Results:
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* Always returns GrabSuccess.
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*
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* Side effects:
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* Turns on mouse capture, sets the global grab pointer, and
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* clears any window restrictions.
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*
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*----------------------------------------------------------------------
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*/
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int
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XGrabPointer(display, grab_window, owner_events, event_mask, pointer_mode,
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keyboard_mode, confine_to, cursor, time)
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Display* display;
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Window grab_window;
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Bool owner_events;
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unsigned int event_mask;
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int pointer_mode;
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int keyboard_mode;
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Window confine_to;
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Cursor cursor;
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Time time;
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{
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display->request++;
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grabWinPtr = (TkWindow *) Tk_IdToWindow(display, grab_window);
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restrictWinPtr = NULL;
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TkpSetCapture(grabWinPtr);
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if (TkPositionInTree(lastWinPtr, grabWinPtr) != TK_GRAB_IN_TREE) {
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UpdateCursor(grabWinPtr);
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}
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return GrabSuccess;
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}
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/*
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*----------------------------------------------------------------------
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*
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* XUngrabPointer --
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*
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* Release the current grab.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Releases the mouse capture.
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*
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*----------------------------------------------------------------------
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*/
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void
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XUngrabPointer(display, time)
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Display* display;
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Time time;
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{
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display->request++;
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grabWinPtr = NULL;
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restrictWinPtr = NULL;
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TkpSetCapture(NULL);
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UpdateCursor(lastWinPtr);
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}
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/*
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*----------------------------------------------------------------------
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*
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* TkPointerDeadWindow --
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*
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* Clean up pointer module state when a window is destroyed.
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*
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* Results:
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* None.
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*
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* Side effects:
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* May release the current capture window.
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*
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*----------------------------------------------------------------------
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*/
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void
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TkPointerDeadWindow(winPtr)
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TkWindow *winPtr;
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{
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if (winPtr == lastWinPtr) {
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lastWinPtr = NULL;
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}
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if (winPtr == grabWinPtr) {
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grabWinPtr = NULL;
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}
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if (winPtr == restrictWinPtr) {
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restrictWinPtr = NULL;
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}
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if (!(restrictWinPtr || grabWinPtr)) {
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TkpSetCapture(NULL);
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}
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}
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/*
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*----------------------------------------------------------------------
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*
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* UpdateCursor --
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*
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* Set the windows global cursor to the cursor associated with
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* the given Tk window.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Changes the mouse cursor.
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*
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*----------------------------------------------------------------------
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*/
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static void
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UpdateCursor(winPtr)
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TkWindow *winPtr;
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{
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Cursor cursor = None;
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/*
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* A window inherits its cursor from its parent if it doesn't
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* have one of its own. Top level windows inherit the default
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* cursor.
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*/
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cursorWinPtr = winPtr;
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while (winPtr != NULL) {
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if (winPtr->atts.cursor != None) {
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cursor = winPtr->atts.cursor;
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break;
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} else if (winPtr->flags & TK_TOP_LEVEL) {
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break;
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}
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winPtr = winPtr->parentPtr;
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}
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TkpSetCursor((TkpCursor) cursor);
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}
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/*
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*----------------------------------------------------------------------
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*
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* XDefineCursor --
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*
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* This function is called to update the cursor on a window.
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* Since the mouse might be in the specified window, we need to
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* check the specified window against the current mouse position
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* and grab state.
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*
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* Results:
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* None.
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*
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* Side effects:
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* May update the cursor.
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*
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*----------------------------------------------------------------------
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*/
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void
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XDefineCursor(display, w, cursor)
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Display* display;
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Window w;
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Cursor cursor;
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{
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TkWindow *winPtr = (TkWindow *)Tk_IdToWindow(display, w);
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if (cursorWinPtr == winPtr) {
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UpdateCursor(winPtr);
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}
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display->request++;
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}
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/*
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*----------------------------------------------------------------------
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*
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* TkGenerateActivateEvents --
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*
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* This function is called by the Mac and Windows window manager
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* routines when a toplevel window is activated or deactivated.
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* Activate/Deactivate events will be sent to every subwindow of
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* the toplevel followed by a FocusIn/FocusOut message.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Generates X events.
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*
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*----------------------------------------------------------------------
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*/
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void
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TkGenerateActivateEvents(winPtr, active)
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||
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);
|
||
|
||
}
|