UNIXworkcode

/* * Copyright 2020 Olaf Wintermann * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. */ #include "xdnd.h" #include <stdio.h> #include <stdlib.h> #include <string.h> static Atom XdndAware; static Atom XdndSelection; static Atom XdndStatus; static Atom XdndActionCopy; static Atom XdndFinished; static Window src; static Atom selType; static int canDrop; XtCallbackProc dropCallback; XtPointer dropData; static void checkSelectionValue(Widget w, XtPointer clientData, Atom *selType, Atom *type, XtPointer value, unsigned long *length, int *format) { if(value) { canDrop = 1; // we have a text/uri-list value XtFree(value); } } static void getSelectionValue(Widget w, XtPointer clientData, Atom *selType, Atom *type, XtPointer value, unsigned long *length, int *format) { if(value) { if(dropCallback) { dropCallback(w, value, dropData); } XtFree(value); // XdndFinished if(src != 0) { XEvent msg; memset(&msg, 0, sizeof(XEvent)); msg.xany.type = ClientMessage; msg.xany.display = XtDisplay(w); msg.xclient.window = src; msg.xclient.message_type = XdndFinished; msg.xclient.format = 32; msg.xclient.data.l[0] = XtWindow(w); XSendEvent(XtDisplay(w), msg.xclient.window, 0, 0, &msg); src = 0; } } } static void xdnd_enter(Widget w, XEvent *event, String *args, Cardinal *nArgs) { //printf("xdnd_enter\n"); XtGetSelectionValue(w, XdndSelection, selType, checkSelectionValue, NULL, 0); } static void xdnd_position(Widget w, XEvent *event, String *args, Cardinal *nArgs) { //printf("xdnd_position\n"); src = event->xclient.data.l[0]; XEvent msg; memset(&msg, 0, sizeof(XEvent)); msg.xany.type = ClientMessage; msg.xany.display = XtDisplay(w); msg.xclient.window = src; msg.xclient.message_type = XdndStatus; msg.xclient.format = 32; msg.xclient.data.l[0] = XtWindow(w); msg.xclient.data.l[1] = canDrop; msg.xclient.data.l[4] = XdndActionCopy; XSendEvent(XtDisplay(w), msg.xclient.window, 0, 0, &msg); } static void xdnd_drop(Widget w, XEvent *event, String *args, Cardinal *nArgs) { //printf("xdnd_drop\n"); XtGetSelectionValue(w, XdndSelection, selType, getSelectionValue, NULL, 0); canDrop = 0; } static void xdnd_leave(Widget w, XEvent *event, String *args, Cardinal *nArgs) { //printf("xdnd_leave\n"); canDrop = 0; } static XtActionsRec xdndactions[] = { {"xdnd_enter", xdnd_enter}, {"xdnd_position", xdnd_position}, {"xdnd_drop", xdnd_drop}, {"xdnd_leave", xdnd_leave} }; void XdndInit( Display *dpy, XtAppContext app, XtCallbackProc dropCB, XtPointer dropCBData) { // init atoms XdndAware = XInternAtom(dpy, "XdndAware", False); XdndSelection = XInternAtom(dpy, "XdndSelection", False); XdndStatus = XInternAtom(dpy, "XdndStatus", False); XdndActionCopy = XInternAtom(dpy, "XdndActionCopy", False); XdndFinished = XInternAtom(dpy, "XdndFinished", False); selType = XInternAtom(dpy, "text/uri-list", False); XtAppAddActions( app, xdndactions, sizeof(xdndactions) / sizeof(XtActionsRec)); dropCallback = dropCB; dropData = dropCBData; } void XdndEnable(Widget w) { long version = 4; XChangeProperty( XtDisplay(w), XtWindow(w), XdndAware, XA_ATOM, 32, PropModeReplace, (XtPointer)&version, 1); if(XtIsShell(w)) { XtOverrideTranslations(w, XtParseTranslationTable( "<Message>XdndEnter: xdnd_enter()\n" "<Message>XdndPosition: xdnd_position()\n" "<Message>XdndDrop: xdnd_drop()\n" "<Message>XdndLeave: xdnd_leave()\n")); } }