WINGs/dragdestination.c

   1
   2
   3 #include <X11/Xatom.h>
   4
   5 #include "WINGsP.h"
   6
   7
   8 /* dropping */
   9
  10 typedef struct W_DNDTargetInfo {
  11     /* data types accepted for drops */
  12     Atom *dropTypes;
  13     int dropTypeCount;
  14
  15
  16 } DNDTargetInfo;
  17
  18
  19 static Atom XDNDversion = XDND_VERSION;
  20
  21
  22 static void
  23 realizedObserver(void *self, WMNotification *notif)
  24 {
  25     WMView *view = (WMView*)WMGetNotificationObject(notif);
  26
  27     XChangeProperty(W_VIEW_SCREEN(view)->display, W_VIEW_DRAWABLE(view),
  28                     W_VIEW_SCREEN(view)->xdndAwareAtom,
  29                     XA_ATOM, 32, PropModeReplace,
  30                     (unsigned char*)&XDNDversion, 1);
  31
  32     WMRemoveNotificationObserver(self);
  33 }
  34
  35
  36 void
  37 W_SetXdndAwareProperty(WMScreen *scr, WMView *view, Atom *types, int typeCount)
  38 {
  39     Display *dpy = scr->display;
  40
  41     view = W_TopLevelOfView(view);
  42
  43     if (!view->flags.xdndHintSet) {
  44         view->flags.xdndHintSet = 1;
  45
  46         if (view->flags.realized) {
  47             XChangeProperty(dpy, W_VIEW_DRAWABLE(view), scr->xdndAwareAtom,
  48                             XA_ATOM, 32, PropModeReplace,
  49                             (unsigned char*)&XDNDversion, 1);
  50         } else {
  51             WMAddNotificationObserver(realizedObserver,
  52                                       /* just use as an id */
  53                                       &view->dragDestinationProcs,
  54                                       WMViewRealizedNotification,
  55                                       view);
  56         }
  57     }
  58 }
  59
  60
  61
  62 void
  63 WMRegisterViewForDraggedTypes(WMView *view, char *acceptedTypes[])
  64 {
  65     Atom *types;
  66     int typeCount;
  67     int i;
  68
  69     typeCount = 0;
  70     while (acceptedTypes[typeCount++]);
  71
  72     types = wmalloc(sizeof(Atom)*(typeCount+1));
  73
  74     for (i = 0; i < typeCount; i++) {
  75         types[i] = XInternAtom(W_VIEW_SCREEN(view)->display,
  76                                acceptedTypes[i], False);
  77     }
  78     types[i] = 0;
  79
  80     view->droppableTypes = types;
  81
  82     W_SetXdndAwareProperty(W_VIEW_SCREEN(view), view, types, typeCount);
  83 }
  84
  85
  86 void
  87 WMUnregisterViewDraggedTypes(WMView *view)
  88 {
  89     if (view->droppableTypes != NULL)
  90         free(view->droppableTypes);
  91     view->droppableTypes = NULL;
  92 }
  93
  94 /***********************************************************************/
  95
  96
  97 static unsigned defDraggingEntered(WMView *self, WMDraggingInfo *info)
  98 {
  99     return WDOperationNone;
 100 }
 101
 102 static unsigned defDraggingUpdated(WMView *self, WMDraggingInfo *info)
 103 {
 104     return WDOperationNone;
 105 }
 106
 107 static void defDraggingExited(WMView *self, WMDraggingInfo *info)
 108 {
 109 }
 110
 111 static char* defPrepareForDragOperation(WMView *self, WMDraggingInfo *info)
 112 {
 113     return NULL;
 114 }
 115
 116 static Bool defPerformDragOperation(WMView *self, WMDraggingInfo *info,
 117                                     WMData *data)
 118 {
 119     return False;
 120 }
 121
 122 static void defConcludeDragOperation(WMView *self, WMDraggingInfo *info)
 123 {
 124 }
 125
 126
 127
 128 void
 129 WMSetViewDragDestinationProcs(WMView *view, WMDragDestinationProcs *procs)
 130 {
 131     if (view->dragDestinationProcs == NULL) {
 132         free(view->dragDestinationProcs);
 133         view->dragDestinationProcs = wmalloc(sizeof(WMDragDestinationProcs));
 134     }
 135     *view->dragDestinationProcs = *procs;
 136
 137     /*XXX fill in non-implemented stuffs */
 138     if (procs->draggingEntered == NULL) {
 139         view->dragDestinationProcs->draggingEntered = defDraggingEntered;
 140     }
 141     if (procs->draggingUpdated == NULL) {
 142         view->dragDestinationProcs->draggingUpdated = defDraggingUpdated;
 143     }
 144     if (procs->draggingExited == NULL) {
 145         view->dragDestinationProcs->draggingExited = defDraggingExited;
 146     }
 147     if (procs->prepareForDragOperation == NULL) {
 148         view->dragDestinationProcs->prepareForDragOperation =
 149             defPrepareForDragOperation;
 150     }
 151     if (procs->performDragOperation == NULL) {
 152         view->dragDestinationProcs->performDragOperation =
 153             defPerformDragOperation;
 154     }
 155     if (procs->concludeDragOperation == NULL) {
 156         view->dragDestinationProcs->concludeDragOperation =
 157             defConcludeDragOperation;
 158     }
 159 }
 160
 161
 162
 163
 164
 165
 166
 167 WMPoint WMGetDraggingInfoImageLocation(WMDraggingInfo *info)
 168 {
 169     return info->imageLocation;
 170 }