/* Part of XPCE --- The SWI-Prolog GUI toolkit Author: Jan Wielemaker and Anjo Anjewierden E-mail: jan@swi.psy.uva.nl WWW: http://www.swi.psy.uva.nl/projects/xpce/ Copyright (c) 1985-2002, University of Amsterdam All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include #include static status initialisePopupGesture(PopupGesture g, PopupObj popup, Name button, Modifier modifier) { if ( isDefault(popup) ) popup = NIL; initialiseGesture((Gesture) g, button, modifier); assign(g, popup, popup); succeed; } static status cancelPopupGesture(PopupGesture g, EventObj ev) { assign(g, current, NIL); assign(g, context, NIL); return cancelGesture((Gesture)g, ev); } static status updatePopupGesture(PopupGesture g, EventObj ev) { PopupObj p; Any rec = getMasterEvent(ev); DEBUG(NAME_popup, Cprintf("updatePopupGesture(): rec=%s\n", pp(rec))); if ( notNil(g->popup) ) { if ( instanceOfObject(g->popup, ClassFunction) ) { TRY( p = getForwardReceiverFunction((Function) g->popup, rec, rec, ev, EAV) ); TRY( p = checkType(p, nameToType(NAME_popup), g)); } else p = g->popup; } else { if ( !(p = get(rec, NAME_popup, EAV)) || !instanceOfObject(p, ClassPopup) ) fail; } assign(g, current, p); if ( isNil(g->context) ) assign(g, context, notNil(p->context) ? p->context : rec); send(p, NAME_update, g->context, EAV); if ( p->active == OFF || emptyChain(p->members) ) { send(g, NAME_cancel, ev, EAV); fail; } succeed; } static status eventPopupGesture(PopupGesture g, EventObj ev) { if ( g->status == NAME_active && isUpEvent(ev) ) { PceWindow sw; if ( !(sw = getWindowGraphical(ev->receiver)) ) sw = ev->window; if ( notNil(g->current) && g->current->displayed == OFF ) { send(g->current, NAME_open, ev->receiver, getAreaPositionEvent(ev, DEFAULT), EAV); attributeObject(g, NAME_Stayup, ON); grabPointerWindow(sw, ON); focusWindow(sw, ev->receiver, (Recogniser) g, g->cursor, NIL); } else if ( valInt(getClickTimeEvent(ev)) < 400 && getAttributeObject(g, NAME_Stayup) != ON ) { attributeObject(g, NAME_Stayup, ON); grabPointerWindow(sw, ON); focusWindow(sw, ev->receiver, (Recogniser) g, g->cursor, NIL); } else { send(g, NAME_terminate, EAV); if ( isNil(g->current) ) { grabPointerWindow(sw, OFF); focusWindow(sw, NIL, NIL, NIL, NIL); deleteAttributeObject(g, NAME_Stayup); assign(g, status, NAME_inactive); } } succeed; } else if ( notNil(g->current) && g->current->displayed == ON ) return postEvent(ev, (Graphical) g->current, DEFAULT); if ( eventGesture(g, ev) ) succeed; if ( g->status == NAME_active && isAEvent(ev, NAME_keyboard) ) { Name key; TRY(updatePopupGesture(g, ev)); key = characterName(getIdEvent(ev)); if ( send(g->current, NAME_key, key, EAV) ) { Any context = g->context; PopupObj current = g->current; assign(g, context, NIL); assign(g, current, NIL); send(current, NAME_execute, context, EAV); succeed; } else send(g, NAME_cancel, ev, EAV); } fail; } /******************************** * GESTURE BEHAVIOUR * ********************************/ static status verifyPopupGesture(PopupGesture g, EventObj ev) { return updatePopupGesture(g, ev); } static status initiatePopupGesture(PopupGesture g, EventObj ev) { if ( isNil(g->max_drag_distance) ) { send(g->current, NAME_open, ev->receiver, getAreaPositionEvent(ev, DEFAULT), EAV); postEvent(ev, (Graphical) g->current, DEFAULT); } succeed; } static status dragPopupGesture(PopupGesture g, EventObj ev) { if ( notNil(g->current) && g->current->displayed == ON ) { DEBUG(NAME_popup, Cprintf("Posting drag to %s\n", pp(g->current))); return postEvent(ev, (Graphical) g->current, DEFAULT); } else { if ( notNil(g->max_drag_distance) ) { PceWindow sw; if ( instanceOfObject((sw=ev->window), ClassWindow) && valInt(getDistanceEvent(sw->focus_event, ev)) > valInt(g->max_drag_distance) ) send(g, NAME_cancel, ev, EAV); } } fail; } /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - To avoid dangling references, the context and current are first copied to local variables. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ static status terminatePopupGesture(PopupGesture g, EventObj ev) { Any context = g->context; PopupObj current = g->current; if ( notNil(current) ) { postEvent(ev, (Graphical) current, DEFAULT); if ( current->displayed == OFF ) /* for stayup */ { PceWindow sw; if ( !(sw = getWindowGraphical(ev->receiver)) ) sw = ev->window; assign(g, context, NIL); assign(g, current, NIL); grabPointerWindow(sw, OFF); send(current, NAME_execute, context, EAV); focusWindow(sw, NIL, NIL, NIL, NIL); } } succeed; } /******************************* * CLASS DECLARATION * *******************************/ /* Type declarations */ static char *T_initialise[] = { "popup=[popup|function]", "button=[button_name]", "modifier=[modifier]" }; /* Instance Variables */ static vardecl var_popupGesture[] = { IV(NAME_popup, "popup|function*", IV_BOTH, NAME_popup, "Popup displayed"), IV(NAME_current, "popup*", IV_NONE, NAME_popup, "Currently visible popup"), IV(NAME_context, "any", IV_BOTH, NAME_context, "Context to be send with the ->execute"), IV(NAME_maxDragDistance, "int*", IV_BOTH, NAME_cancel, "Cancel after dragging this far") }; /* Send Methods */ static senddecl send_popupGesture[] = { SM(NAME_drag, 1, "event", dragPopupGesture, DEFAULT, "Pass drag events to popup"), SM(NAME_initialise, 3, T_initialise, initialisePopupGesture, DEFAULT, "Create from popup, button and modifier"), SM(NAME_initiate, 1, "event", initiatePopupGesture, DEFAULT, "Show popup"), SM(NAME_terminate, 1, "event", terminatePopupGesture, DEFAULT, "Unshow popup and execute selected item"), SM(NAME_verify, 1, "event", verifyPopupGesture, DEFAULT, "Verify popup can be activated"), SM(NAME_cancel, 1, "event", cancelPopupGesture, NAME_cancel, "Cancel this gesture and try the next"), SM(NAME_event, 1, "event", eventPopupGesture, NAME_accelerator, "Handle accelerators") }; /* Get Methods */ #define get_popupGesture NULL /* static getdecl get_popupGesture[] = { }; */ /* Resources */ static classvardecl rc_popupGesture[] = { RC(NAME_button, "button_name", "right", "Active on which button (right)"), RC(NAME_cursor, "cursor", "right_ptr", "Cursor while active"), RC(NAME_modifier, "modifier", "", "Condition on shift, control and meta"), RC(NAME_maxDragDistance, "int*", "5", "Cancel after dragging this far") }; /* Class Declaration */ static Name popupGesture_termnames[] = { NAME_popup, NAME_button, NAME_modifier }; ClassDecl(popupGesture_decls, var_popupGesture, send_popupGesture, get_popupGesture, rc_popupGesture, 3, popupGesture_termnames, "$Rev$"); status makeClassPopupGesture(Class class) { return declareClass(class, &popupGesture_decls); } Recogniser popupGesture() { if ( GESTURE_popup == NULL ) GESTURE_popup = globalObject(NAME_PopupGesture, ClassPopupGesture, EAV); return (Recogniser) GESTURE_popup; }