netsurf/framebuffer/fbtk/scroll.c

549 lines
14 KiB
C

/*
* Copyright 2010 Vincent Sanders <vince@simtec.co.uk>
*
* Framebuffer windowing toolkit scrollbar widgets
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdbool.h>
#include <libnsfb.h>
#include <libnsfb_plot.h>
#include <libnsfb_event.h>
#include <libnsfb_cursor.h>
#include "utils/log.h"
#include "desktop/browser.h"
#include "framebuffer/gui.h"
#include "framebuffer/fbtk.h"
#include "framebuffer/image_data.h"
#include "widget.h"
/* Vertical scroll widget */
static int
vscroll_redraw(fbtk_widget_t *widget, fbtk_callback_info *cbi)
{
int vscroll;
int vpos;
nsfb_bbox_t bbox;
nsfb_bbox_t rect;
fbtk_widget_t *root = fbtk_get_root_widget(widget);
fbtk_get_bbox(widget, &bbox);
nsfb_claim(root->u.root.fb, &bbox);
rect = bbox;
/* background */
nsfb_plot_rectangle_fill(root->u.root.fb, &rect, widget->bg);
/* scroll well */
rect.x0 = bbox.x0 + 2;
rect.y0 = bbox.y0 + 1;
rect.x1 = bbox.x1 - 3;
rect.y1 = bbox.y1 - 2;
nsfb_plot_rectangle_fill(root->u.root.fb, &rect, widget->fg);
nsfb_plot_rectangle(root->u.root.fb, &rect, 1, 0xFF999999, false, false);
/* scroll bar */
if ((widget->u.scroll.maximum - widget->u.scroll.minimum) > 0) {
vscroll = ((widget->height - 4) * widget->u.scroll.thumb) /
(widget->u.scroll.maximum - widget->u.scroll.minimum) ;
vpos = ((widget->height - 4) * widget->u.scroll.position) /
(widget->u.scroll.maximum - widget->u.scroll.minimum) ;
} else {
vscroll = (widget->height - 4);
vpos = 0;
}
rect.x0 = bbox.x0 + 5;
rect.y0 = bbox.y0 + 3 + vpos;
rect.x1 = bbox.x0 + widget->width - 5;
rect.y1 = bbox.y0 + vscroll + vpos;
nsfb_plot_rectangle_fill(root->u.root.fb, &rect, widget->bg);
nsfb_update(root->u.root.fb, &bbox);
return 0;
}
static int
vscroll_drag(fbtk_widget_t *widget, fbtk_callback_info *cbi)
{
int newpos;
fbtk_widget_t *scrollw = cbi->context;
newpos = ((widget->u.scroll.drag_position +
(cbi->y - widget->u.scroll.drag)) *
(widget->u.scroll.maximum - widget->u.scroll.minimum)) /
(widget->height - 4);
if (newpos < scrollw->u.scroll.minimum)
newpos = scrollw->u.scroll.minimum;
if (newpos > (scrollw->u.scroll.maximum - scrollw->u.scroll.thumb ))
newpos = (scrollw->u.scroll.maximum - scrollw->u.scroll.thumb);
if (newpos == scrollw->u.scroll.position)
return 0;
return fbtk_post_callback(widget, FBTK_CBT_SCROLLY, newpos);
}
static int
vscrollu_click(fbtk_widget_t *widget, fbtk_callback_info *cbi)
{
int newpos;
fbtk_widget_t *scrollw = cbi->context;
if (cbi->event->type != NSFB_EVENT_KEY_DOWN)
return 0;
newpos = scrollw->u.scroll.position - scrollw->u.scroll.page;
if (newpos < scrollw->u.scroll.minimum)
newpos = scrollw->u.scroll.minimum;
if (newpos == scrollw->u.scroll.position)
return 0;
return fbtk_post_callback(scrollw, FBTK_CBT_SCROLLY, newpos);
}
static int
vscrolld_click(fbtk_widget_t *widget, fbtk_callback_info *cbi)
{
int newpos;
fbtk_widget_t *scrollw = cbi->context;
if (cbi->event->type != NSFB_EVENT_KEY_DOWN)
return 0;
newpos = scrollw->u.scroll.position + scrollw->u.scroll.page;
if (newpos > (scrollw->u.scroll.maximum - scrollw->u.scroll.thumb ))
newpos = (scrollw->u.scroll.maximum - scrollw->u.scroll.thumb);
if (newpos == scrollw->u.scroll.position)
return 0;
return fbtk_post_callback(scrollw, FBTK_CBT_SCROLLY, newpos);
}
static int
vscrollarea_click(fbtk_widget_t *widget, fbtk_callback_info *cbi)
{
int vscroll;
int vpos;
int newpos;
int ret = 0;
if (cbi->event->type != NSFB_EVENT_KEY_DOWN) {
/* end all drags, just in case */
if (fbtk_set_handler(widget, FBTK_CBT_POINTERMOVE, NULL, NULL) != NULL)
fbtk_tgrab_pointer(widget);
return 0;
}
switch (cbi->event->value.keycode) {
case NSFB_KEY_MOUSE_4:
/* scroll up */
newpos = widget->u.scroll.position - widget->u.scroll.page;
if (newpos < widget->u.scroll.minimum)
newpos = widget->u.scroll.minimum;
ret = fbtk_post_callback(cbi->context, FBTK_CBT_SCROLLY, newpos);
break;
case NSFB_KEY_MOUSE_5:
/* scroll down */
newpos = widget->u.scroll.position + widget->u.scroll.page;
if (newpos > widget->u.scroll.maximum)
newpos = widget->u.scroll.maximum;
ret = fbtk_post_callback(cbi->context, FBTK_CBT_SCROLLY, newpos);
break;
default:
if ((widget->u.scroll.maximum - widget->u.scroll.minimum) > 0) {
vscroll = ((widget->height - 4) * widget->u.scroll.thumb) /
(widget->u.scroll.maximum - widget->u.scroll.minimum) ;
vpos = ((widget->height - 4) * widget->u.scroll.position) /
(widget->u.scroll.maximum - widget->u.scroll.minimum) ;
} else {
vscroll = (widget->height - 4);
vpos = 0;
}
if (cbi->y < vpos) {
/* above bar */
newpos = widget->u.scroll.position - widget->u.scroll.thumb;
if (newpos < widget->u.scroll.minimum)
newpos = widget->u.scroll.minimum;
ret = fbtk_post_callback(cbi->context, FBTK_CBT_SCROLLY, newpos);
} else if (cbi->y > (vpos + vscroll)) {
/* below bar */
newpos = widget->u.scroll.position + widget->u.scroll.thumb;
if (newpos > widget->u.scroll.maximum)
newpos = widget->u.scroll.maximum;
ret = fbtk_post_callback(cbi->context, FBTK_CBT_SCROLLY, newpos);
} else {
/* on bar - start drag */
widget->u.scroll.drag = cbi->y;
widget->u.scroll.drag_position = vpos;
fbtk_set_handler(widget, FBTK_CBT_POINTERMOVE, vscroll_drag, widget);
fbtk_tgrab_pointer(widget);
}
}
return ret;
}
/* exported function documented in fbtk.h */
fbtk_widget_t *
fbtk_create_vscroll(fbtk_widget_t *parent,
int x,
int y,
int width,
int height,
colour fg,
colour bg,
fbtk_callback callback,
void *context)
{
fbtk_widget_t *neww;
neww = fbtk_widget_new(parent,
FB_WIDGET_TYPE_VSCROLL,
x,
y + scrollu.height,
width,
height - scrollu.height - scrolld.height);
neww->fg = fg;
neww->bg = bg;
neww->mapped = true;
fbtk_set_handler(neww, FBTK_CBT_REDRAW, vscroll_redraw, NULL);
fbtk_set_handler(neww, FBTK_CBT_CLICK, vscrollarea_click, neww);
fbtk_set_handler(neww, FBTK_CBT_SCROLLY, callback, context);
neww->u.scroll.btnul = fbtk_create_button(parent,
x,
y,
width,
scrollu.height,
fg,
&scrollu,
vscrollu_click,
neww);
neww->u.scroll.btndr = fbtk_create_button(parent,
x,
y + height - scrolld.height,
width,
scrolld.height,
fg,
&scrolld,
vscrolld_click,
neww);
return neww;
}
/* Horizontal scroll widget */
static int
hscroll_redraw(fbtk_widget_t *widget, fbtk_callback_info *cbi)
{
int hscroll;
int hpos;
nsfb_bbox_t bbox;
nsfb_bbox_t rect;
fbtk_widget_t *root = fbtk_get_root_widget(widget);
fbtk_get_bbox(widget, &bbox);
nsfb_claim(root->u.root.fb, &bbox);
rect = bbox;
/* background */
nsfb_plot_rectangle_fill(root->u.root.fb, &rect, widget->bg);
/* scroll well */
rect.x0 = bbox.x0 + 1;
rect.y0 = bbox.y0 + 2;
rect.x1 = bbox.x1 - 2;
rect.y1 = bbox.y1 - 3;
nsfb_plot_rectangle_fill(root->u.root.fb, &rect, widget->fg);
/* scroll well outline */
nsfb_plot_rectangle(root->u.root.fb, &rect, 1, 0xFF999999, false, false);
if ((widget->u.scroll.maximum - widget->u.scroll.minimum) > 0) {
hscroll = ((widget->width - 4) * widget->u.scroll.thumb) /
(widget->u.scroll.maximum - widget->u.scroll.minimum) ;
hpos = ((widget->width - 4) * widget->u.scroll.position) /
(widget->u.scroll.maximum - widget->u.scroll.minimum) ;
} else {
hscroll = (widget->width - 4);
hpos = 0;
}
LOG(("hscroll %d", hscroll));
rect.x0 = bbox.x0 + 3 + hpos;
rect.y0 = bbox.y0 + 5;
rect.x1 = bbox.x0 + hscroll + hpos;
rect.y1 = bbox.y0 + widget->height - 5;
nsfb_plot_rectangle_fill(root->u.root.fb, &rect, widget->bg);
nsfb_update(root->u.root.fb, &bbox);
return 0;
}
static int
hscrolll_click(fbtk_widget_t *widget, fbtk_callback_info *cbi)
{
int newpos;
fbtk_widget_t *scrollw = cbi->context;
if (cbi->event->type != NSFB_EVENT_KEY_DOWN)
return 0;
newpos = scrollw->u.scroll.position - scrollw->u.scroll.page;
if (newpos < scrollw->u.scroll.minimum)
newpos = scrollw->u.scroll.minimum;
if (newpos == scrollw->u.scroll.position) {
LOG(("horiz scroll was the same %d", newpos));
return 0;
}
return fbtk_post_callback(scrollw, FBTK_CBT_SCROLLX, newpos);
}
static int
hscrollr_click(fbtk_widget_t *widget, fbtk_callback_info *cbi)
{
int newpos;
fbtk_widget_t *scrollw = cbi->context;
if (cbi->event->type != NSFB_EVENT_KEY_DOWN)
return 0;
newpos = scrollw->u.scroll.position + scrollw->u.scroll.page;
if (newpos > (scrollw->u.scroll.maximum - scrollw->u.scroll.thumb ))
newpos = (scrollw->u.scroll.maximum - scrollw->u.scroll.thumb);
if (newpos == scrollw->u.scroll.position)
return 0;
return fbtk_post_callback(scrollw, FBTK_CBT_SCROLLX, newpos);
}
static int
hscroll_drag(fbtk_widget_t *widget, fbtk_callback_info *cbi)
{
int newpos;
fbtk_widget_t *scrollw = cbi->context;
newpos = ((widget->u.scroll.drag_position +
(cbi->x - widget->u.scroll.drag)) *
(widget->u.scroll.maximum - widget->u.scroll.minimum)) /
(widget->width - 4);
if (newpos < scrollw->u.scroll.minimum)
newpos = scrollw->u.scroll.minimum;
if (newpos > (scrollw->u.scroll.maximum - scrollw->u.scroll.thumb ))
newpos = (scrollw->u.scroll.maximum - scrollw->u.scroll.thumb);
if (newpos == scrollw->u.scroll.position)
return 0;
return fbtk_post_callback(widget, FBTK_CBT_SCROLLX, newpos);
}
static int
hscrollarea_click(fbtk_widget_t *widget, fbtk_callback_info *cbi)
{
int hscroll;
int hpos;
int newpos;
int ret = 0;
if (cbi->event->type != NSFB_EVENT_KEY_DOWN) {
/* end all drags, just in case */
if (fbtk_set_handler(widget, FBTK_CBT_POINTERMOVE, NULL, NULL) != NULL)
fbtk_tgrab_pointer(widget);
return 0;
}
if ((widget->u.scroll.maximum - widget->u.scroll.minimum) > 0) {
hscroll = ((widget->width - 4) * widget->u.scroll.thumb) /
(widget->u.scroll.maximum - widget->u.scroll.minimum) ;
hpos = ((widget->width - 4) * widget->u.scroll.position) /
(widget->u.scroll.maximum - widget->u.scroll.minimum) ;
} else {
hscroll = (widget->width - 4);
hpos = 0;
}
if (cbi->x < hpos) {
/* left of bar */
newpos = widget->u.scroll.position - widget->u.scroll.page;
if (newpos < widget->u.scroll.minimum)
newpos = widget->u.scroll.minimum;
ret = fbtk_post_callback(cbi->context, FBTK_CBT_SCROLLX, newpos);
} else if (cbi->x > (hpos + hscroll)) {
/* right of bar */
newpos = widget->u.scroll.position + widget->u.scroll.page;
if (newpos > widget->u.scroll.maximum)
newpos = widget->u.scroll.maximum;
ret = fbtk_post_callback(cbi->context, FBTK_CBT_SCROLLX, newpos);
} else {
/* on bar - start drag */
widget->u.scroll.drag = cbi->x;
widget->u.scroll.drag_position = hpos;
fbtk_set_handler(widget, FBTK_CBT_POINTERMOVE, hscroll_drag, widget);
fbtk_tgrab_pointer(widget);
}
return ret;
}
/* exported function documented in fbtk.h */
fbtk_widget_t *
fbtk_create_hscroll(fbtk_widget_t *parent,
int x,
int y,
int width,
int height,
colour fg,
colour bg,
fbtk_callback callback,
void *context)
{
fbtk_widget_t *neww;
neww = fbtk_widget_new(parent,
FB_WIDGET_TYPE_HSCROLL,
x + scrolll.width,
y,
width - scrolll.width - scrollr.width,
height);
neww->fg = fg;
neww->bg = bg;
neww->mapped = true;
fbtk_set_handler(neww, FBTK_CBT_REDRAW, hscroll_redraw, NULL);
fbtk_set_handler(neww, FBTK_CBT_CLICK, hscrollarea_click, neww);
fbtk_set_handler(neww, FBTK_CBT_SCROLLX, callback, context);
neww->u.scroll.btnul = fbtk_create_button(parent,
x,
y,
scrolll.width,
height,
fg,
&scrolll,
hscrolll_click,
neww);
neww->u.scroll.btndr = fbtk_create_button(parent,
x + width - scrollr.width,
y,
scrollr.width,
height,
fg,
&scrollr,
hscrollr_click,
neww);
return neww;
}
/* exported function documented in fbtk.h */
bool
fbtk_set_scroll_parameters(fbtk_widget_t *widget,
int min,
int max,
int thumb,
int page)
{
if (widget == NULL)
return false;
if ((widget->type != FB_WIDGET_TYPE_HSCROLL) &&
(widget->type != FB_WIDGET_TYPE_VSCROLL))
return false;
widget->u.scroll.minimum = min;
widget->u.scroll.maximum = max;
widget->u.scroll.thumb = thumb;
widget->u.scroll.page = page;
if (widget->u.scroll.position > max)
widget->u.scroll.position = max;
if (widget->u.scroll.position < min)
widget->u.scroll.position = min;
fbtk_request_redraw(widget);
return true;
}
/* exported function documented in fbtk.h */
bool
fbtk_set_scroll_position(fbtk_widget_t *widget, int position)
{
if (widget == NULL)
return false;
if ((widget->type != FB_WIDGET_TYPE_HSCROLL) &&
(widget->type != FB_WIDGET_TYPE_VSCROLL))
return false;
if ((position < widget->u.scroll.minimum) ||
(position > widget->u.scroll.maximum))
return false;
widget->u.scroll.position = position;
fbtk_request_redraw(widget);
return true;
}
/*
* Local Variables:
* c-basic-offset:8
* End:
*/