Gabriele Cosmo
143 lines
5.4 KiB
C++
143 lines
5.4 KiB
C++
/* file scrollmouse.c
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*
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* Event handler for wheel mouse
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*
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* functions: void xmAddMouseEventHandler(Widget w)
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*
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*/
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/*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <X11/Intrinsic.h>
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#include <X11/Xlib.h>
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#include <Xm/Xm.h>
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#include <Xm/ScrollBar.h>
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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/*******************************************************************/
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/* */
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/* NAME: mouseScroll */
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/* */
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/* FUNCTION: do scrolling on button 4 and 5 */
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/* scrolling width depend on shift and control keys */
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/* without pressed key the scrollwidth 1/2 page */
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/* with the control key 1 page */
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/* with the shift key 1 line */
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/* Control + Shift is handled as Shift */
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/* */
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/* INPUT: Widget w not relevant */
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/* XtPointer client_data really the scrollbar widget */
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/* Xevent the mosuse button event */
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/* */
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/* OUTPUT: - */
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/* */
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/* RETURN: - */
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/* */
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/* REMARKS: Scrolling don't modify the selection */
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/* */
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/*******************************************************************/
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static void mouseScroll(Widget, XtPointer client_data, XEvent *event)
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{
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Widget sb = (Widget)client_data;
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int value_return = 0;
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int slider_size_return = 0;
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int increment_return = 0;
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int page_increment_return = 0;
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int count;
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int step;
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/* get a few value regarding the scrollbar conf. */
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XmScrollBarGetValues (sb, &value_return, &slider_size_return,
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&increment_return, &page_increment_return);
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/* calculate the step wide according to the pressed keys */
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if ( event->xbutton.state & ShiftMask )
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{
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step = 1;
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}
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else if ( event->xbutton.state & ControlMask )
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{
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step = page_increment_return;
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}
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else
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{
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step = page_increment_return >> 1;
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}
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if ( event->xbutton.button == Button4 )
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{
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value_return -= step;
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if ( value_return < 0 )
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value_return = 0;
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}
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else if ( event->xbutton.button == Button5 )
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{
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/* and the max value for increment */
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XtVaGetValues(sb, XmNmaximum, &count, NULL);
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value_return += step;
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if ( value_return > count - slider_size_return )
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value_return = count - slider_size_return;
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}
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/* finally perform scrolling with the calculated step */
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if ( event->xbutton.button == Button4 ||
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event->xbutton.button == Button5 )
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{
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XmScrollBarSetValues (sb, value_return, slider_size_return,
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increment_return, page_increment_return, True);
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}
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}
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/*******************************************************************/
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/* */
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/* NAME: xmAddMouseEventHandler */
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/* */
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/* FUNCTION: Register the event handler for the button 4 and 5 */
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/* */
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/* INPUT: Widget w The list/text widget */
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/* */
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/* OUTPUT: - */
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/* */
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/* RETURN: - */
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/* */
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/* REMARKS: - */
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/* */
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/*******************************************************************/
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void xmAddMouseEventHandler(Widget w)
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{
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Widget wid;
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/* we need to pass the scrollbar widget to the handler */
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XtVaGetValues(XtParent(w),XmNverticalScrollBar, &wid, NULL);
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/* handler for the scrolledList/ScrolledText */
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XtAddEventHandler(w, ButtonReleaseMask, False,
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(XtEventHandler) mouseScroll, wid);
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/* and for the scrollbar itself */
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XtAddEventHandler(wid, ButtonReleaseMask, False,
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(XtEventHandler) mouseScroll, wid);
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}
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#if defined(__cplusplus) || defined(c_plusplus)
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}
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#endif
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