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netsurf/desktop/scrollbar.c
Vincent Sanders c105738fa3 Change LOG() macro to be varadic 
This changes the LOG macro to be varadic removing the need for all
callsites to have double bracketing and allows for future improvement
on how we use the logging macros.

The callsites were changed with coccinelle and the changes checked by
hand. Compile tested for several frontends but not all.

A formatting annotation has also been added which allows the compiler
to check the parameters and types passed to the logging.
2015-05-28 16:08:46 +01:00

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/*
* Copyright 2004-2008 James Bursa <bursa@users.sourceforge.net>
* Copyright 2008 Michael Drake <tlsa@netsurf-browser.org>
* Copyright 2009 Paul Blokus <paul_pl@users.sourceforge.net>
*
* 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/>.
*/
/** \file
* Scrollbar widget (implementation).
*/
#include <stdbool.h>
#include <stdlib.h>
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/utils.h"
#include "utils/nsoption.h"
#include "desktop/browser.h"
#include "desktop/system_colour.h"
#include "desktop/mouse.h"
#include "desktop/scrollbar.h"
#include "desktop/plotters.h"
#include "desktop/plot_style.h"
struct scrollbar {
bool horizontal; /* Horizontal scrollbar if true, else vertical
*/
int length; /* Length of the scrollbar widget */
int full_size; /* Length of the full scrollable area */
int visible_size; /* Length visible part of the scrollable area */
int offset; /* Current scroll offset to visible area */
int bar_pos; /* Position of the scrollbar */
int bar_len; /* Length of the scrollbar */
scrollbar_client_callback client_callback; /* Callback receiving
* scrollbar events */
void *client_data; /* User data passed to the callback */
bool dragging; /* Flag indicating drag at progess */
int drag_start_coord; /* Coordinate value at drag start */
int drag_start_pos; /* Scrollbar offset or bar_pos at drag start */
bool drag_content; /* Flag indicating that the drag corresponds to
* a dragged content area, rather than a dragged
* scrollbar. */
struct scrollbar *pair; /* Parpendicular scrollbar, or NULL */
bool pair_drag; /* Flag indicating that the current drag affects
the perpendicular scrollbar too */
};
/*
* Exported function. Documented in scrollbar.h
*/
bool scrollbar_create(bool horizontal, int length, int full_size,
int visible_size, void *client_data,
scrollbar_client_callback client_callback,
struct scrollbar **s)
{
struct scrollbar *scrollbar;
int well_length;
scrollbar = malloc(sizeof(struct scrollbar));
if (scrollbar == NULL) {
LOG("malloc failed");
warn_user("NoMemory", 0);
*s = NULL;
return false;
}
scrollbar->horizontal = horizontal;
scrollbar->length = length;
scrollbar->full_size = full_size;
scrollbar->visible_size = visible_size;
scrollbar->offset = 0;
scrollbar->bar_pos = 0;
scrollbar->pair = NULL;
scrollbar->pair_drag = false;
well_length = length - 2 * SCROLLBAR_WIDTH;
scrollbar->bar_len = (full_size == 0) ? 0 :
((well_length * visible_size) / full_size);
scrollbar->client_callback = client_callback;
scrollbar->client_data = client_data;
scrollbar->dragging = false;
scrollbar->drag_content = false;
*s = scrollbar;
return true;
}
/*
* Exported function. Documented in scrollbar.h
*/
void scrollbar_destroy(struct scrollbar *s)
{
if (s->pair != NULL)
s->pair->pair = NULL;
free(s);
}
/**
* Draw an outline rectangle common to a several scrollbar elements.
*
* \param x0 left border of the outline
* \param y0 top border of the outline
* \param x1 right border of the outline
* \param y1 bottom border of the outline
* \param c base colour of the outline, the other colours are created by
* lightening or darkening this one
* \param ctx current redraw context
* \param inset true for inset outline, false for an outset one
* \return
*/
static inline bool scrollbar_redraw_scrollbar_rectangle(int x0, int y0,
int x1, int y1, colour c, bool inset,
const struct redraw_context *ctx)
{
const struct plotter_table *plot = ctx->plot;
static plot_style_t c0 = {
.stroke_type = PLOT_OP_TYPE_SOLID,
.stroke_width = 1,
};
static plot_style_t c1 = {
.stroke_type = PLOT_OP_TYPE_SOLID,
.stroke_width = 1,
};
static plot_style_t c2 = {
.stroke_type = PLOT_OP_TYPE_SOLID,
.stroke_width = 1,
};
if (inset) {
c0.stroke_colour = darken_colour(c);
c1.stroke_colour = lighten_colour(c);
} else {
c0.stroke_colour = lighten_colour(c);
c1.stroke_colour = darken_colour(c);
}
c2.stroke_colour = blend_colour(c0.stroke_colour, c1.stroke_colour);
/* Plot the outline */
if (!plot->line(x0, y0, x1, y0, &c0)) return false;
if (!plot->line(x1, y0, x1, y1 + 1, &c1)) return false;
if (!plot->line(x1, y0, x1, y0 + 1, &c2)) return false;
if (!plot->line(x1, y1, x0, y1, &c1)) return false;
if (!plot->line(x0, y1, x0, y0, &c0)) return false;
if (!plot->line(x0, y1, x0, y1 + 1, &c2)) return false;
return true;
}
/*
* Exported function. Documented in scrollbar.h
*/
bool scrollbar_redraw(struct scrollbar *s, int x, int y,
const struct rect *clip, float scale,
const struct redraw_context *ctx)
{
const struct plotter_table *plot = ctx->plot;
int w = SCROLLBAR_WIDTH;
int bar_pos, bar_c0, bar_c1;
int v[6]; /* array of triangle vertices */
int x0, y0, x1, y1;
colour bg_fill_colour = ns_system_colour_char("Scrollbar");
colour fg_fill_colour = ns_system_colour_char("ButtonFace");
colour arrow_fill_colour = ns_system_colour_char("ButtonText");
plot_style_t bg_fill_style = {
.fill_type = PLOT_OP_TYPE_SOLID,
.fill_colour = bg_fill_colour
};
plot_style_t fg_fill_style = {
.fill_type = PLOT_OP_TYPE_SOLID,
.fill_colour = fg_fill_colour
};
plot_style_t arrow_fill_style = {
.fill_type = PLOT_OP_TYPE_SOLID,
.fill_colour = arrow_fill_colour
};
x0 = x;
y0 = y;
x1 = x + (s->horizontal ? s->length : SCROLLBAR_WIDTH) - 1;
y1 = y + (s->horizontal ? SCROLLBAR_WIDTH : s->length) - 1;
bar_pos = s->bar_pos;
bar_c1 = (s->horizontal ? x0 : y0) + SCROLLBAR_WIDTH +
s->bar_pos + s->bar_len - 1;
if (scale != 1.0) {
w *= scale;
x0 *= scale;
y0 *= scale;
x1 *= scale;
y1 *= scale;
bar_pos *= scale;
bar_c1 *= scale;
}
bar_c0 = (s->horizontal ? x0 : y0) + w + bar_pos;
if (x1 < clip->x0 || y1 < clip->y0 || clip->x1 < x0 || clip->y1 < y0)
/* scrollbar is outside the clipping rectangle, nothing to
* render */
return true;
if (s->horizontal) {
/* scrollbar is horizontal */
/* scrollbar outline */
if (!scrollbar_redraw_scrollbar_rectangle(x0, y0, x1, y1,
bg_fill_colour, true, ctx))
return false;
/* left arrow icon border */
if (!scrollbar_redraw_scrollbar_rectangle(x0 + 1,
y0 + 1,
x0 + w - 2,
y1 - 1,
fg_fill_colour, false, ctx))
return false;
/* left arrow icon background */
if (!plot->rectangle(x0 + 2,
y0 + 2,
x0 + w - 2,
y1 - 1,
&fg_fill_style))
return false;
/* left arrow */
v[0] = x0 + w / 4;
v[1] = y0 + w / 2;
v[2] = x0 + w * 3 / 4;
v[3] = y0 + w / 4;
v[4] = x0 + w * 3 / 4;
v[5] = y0 + w * 3 / 4;
if (!plot->polygon(v, 3, &arrow_fill_style))
return false;
/* scrollbar well background */
if (!plot->rectangle(x0 + w - 1,
y0 + 1,
x1 - w + 2,
y1,
&bg_fill_style))
return false;
/* scrollbar position indicator bar */
if (!scrollbar_redraw_scrollbar_rectangle(bar_c0,
y0 + 1,
bar_c1,
y1 - 1,
fg_fill_colour, false, ctx))
return false;
if (!plot->rectangle(bar_c0 + 1,
y0 + 2,
bar_c1,
y1 - 1,
&fg_fill_style))
return false;
/* right arrow icon border */
if (!scrollbar_redraw_scrollbar_rectangle(x1 - w + 2,
y0 + 1,
x1 - 1,
y1 - 1,
fg_fill_colour, false, ctx))
return false;
/* right arrow icon background */
if (!plot->rectangle(x1 - w + 3,
y0 + 2,
x1 - 1,
y1 - 1,
&fg_fill_style))
return false;
/* right arrow */
v[0] = x1 - w / 4 + 1;
v[1] = y0 + w / 2;
v[2] = x1 - w * 3 / 4 + 1;
v[3] = y0 + w / 4;
v[4] = x1 - w * 3 / 4 + 1;
v[5] = y0 + w * 3 / 4;
if (!plot->polygon(v, 3, &arrow_fill_style))
return false;
} else {
/* scrollbar is vertical */
/* outline */
if (!scrollbar_redraw_scrollbar_rectangle(x0, y0, x1, y1,
bg_fill_colour, true, ctx))
return false;
/* top arrow background */
if (!scrollbar_redraw_scrollbar_rectangle(x0 + 1,
y0 + 1,
x1 - 1,
y0 + w - 2,
fg_fill_colour, false, ctx))
return false;
if (!plot->rectangle(x0 + 2,
y0 + 2,
x1 - 1,
y0 + w - 2,
&fg_fill_style))
return false;
/* up arrow */
v[0] = x0 + w / 2;
v[1] = y0 + w / 4;
v[2] = x0 + w / 4;
v[3] = y0 + w * 3 / 4;
v[4] = x0 + w * 3 / 4;
v[5] = y0 + w * 3 / 4;
if (!plot->polygon(v, 3, &arrow_fill_style))
return false;
/* scrollbar well background */
if (!plot->rectangle(x0 + 1,
y0 + w - 1,
x1,
y1 - w + 2,
&bg_fill_style))
return false;
/* scrollbar position indicator bar */
if (!scrollbar_redraw_scrollbar_rectangle(x0 + 1,
bar_c0,
x1 - 1,
bar_c1,
fg_fill_colour, false, ctx))
return false;
if (!plot->rectangle(x0 + 2,
bar_c0 + 1,
x1 - 1,
bar_c1,
&fg_fill_style))
return false;
/* bottom arrow background */
if (!scrollbar_redraw_scrollbar_rectangle(x0 + 1,
y1 - w + 2,
x1 - 1,
y1 - 1,
fg_fill_colour, false, ctx))
return false;
if (!plot->rectangle(x0 + 2,
y1 - w + 3,
x1 - 1,
y1 - 1,
&fg_fill_style))
return false;
/* down arrow */
v[0] = x0 + w / 2;
v[1] = y1 - w / 4 + 1;
v[2] = x0 + w / 4;
v[3] = y1 - w * 3 / 4 + 1;
v[4] = x0 + w * 3 / 4;
v[5] = y1 - w * 3 / 4 + 1;
if (!plot->polygon(v, 3, &arrow_fill_style))
return false;
}
return true;
}
/*
* Exported function. Documented in scrollbar.h
*/
void scrollbar_set(struct scrollbar *s, int value, bool bar_pos)
{
int well_length;
int old_offset = s->offset;
struct scrollbar_msg_data msg;
if (value < 0)
value = 0;
if (s->full_size == s->visible_size)
return;
well_length = s->length - 2 * SCROLLBAR_WIDTH;
if (bar_pos) {
if (value > well_length - s->bar_len)
s->bar_pos = well_length - s->bar_len;
else
s->bar_pos = value;
s->offset = ((well_length - s->bar_len) < 1) ? 0 :
(((s->full_size - s->visible_size) *
s->bar_pos) / (well_length - s->bar_len));
} else {
if (value > s->full_size - s->visible_size)
s->offset = s->full_size - s->visible_size;
else
s->offset = value;
s->bar_pos = (s->full_size < 1) ? 0 :
((well_length * s->offset) / s->full_size);
}
if (s->offset == old_offset)
/* Nothing happened */
return;
msg.scrollbar = s;
msg.msg = SCROLLBAR_MSG_MOVED;
msg.scroll_offset = s->offset;
s->client_callback(s->client_data, &msg);
}
/*
* Exported function. Documented in scrollbar.h
*/
bool scrollbar_scroll(struct scrollbar *s, int change)
{
int well_length;
int old_offset = s->offset;
struct scrollbar_msg_data msg;
if (change == 0 || s->full_size <= s->visible_size)
/* zero scroll step, or unscrollable */
return false;
/* Convert named change values to appropriate pixel offset value */
switch (change) {
case SCROLL_TOP:
change = -s->full_size;
break;
case SCROLL_PAGE_UP:
change = -s->visible_size;
break;
case SCROLL_PAGE_DOWN:
change = s->visible_size;
break;
case SCROLL_BOTTOM:
change = s->full_size;
break;
default:
/* Change value is already a pixel offset */
break;
}
/* Get new offset */
if (s->offset + change > s->full_size - s->visible_size)
s->offset = s->full_size - s->visible_size;
else if (s->offset + change < 0)
s->offset = 0;
else
s->offset += change;
if (s->offset == old_offset)
/* Nothing happened */
return false;
/* Update scrollbar */
well_length = s->length - 2 * SCROLLBAR_WIDTH;
s->bar_pos = (s->full_size < 1) ? 0 :
((well_length * s->offset) / s->full_size);
msg.scrollbar = s;
msg.msg = SCROLLBAR_MSG_MOVED;
msg.scroll_offset = s->offset;
s->client_callback(s->client_data, &msg);
return true;
}
/*
* Exported function. Documented in scrollbar.h
*/
int scrollbar_get_offset(struct scrollbar *s)
{
if (s == NULL)
return 0;
return s->offset;
}
/*
* Exported function. Documented in scrollbar.h
*/
void scrollbar_set_extents(struct scrollbar *s, int length,
int visible_size, int full_size)
{
int cur_excess = s->full_size - s->visible_size;
int well_length;
struct scrollbar_msg_data msg;
if (length == s->length && visible_size == s->visible_size &&
full_size == s->full_size) {
/* Nothing's changed. */
return;
}
if (length != -1)
s->length = length;
if (visible_size != -1)
s->visible_size = visible_size;
if (full_size != -1)
s->full_size = full_size;
if (s->full_size < s->visible_size)
s->full_size = s->visible_size;
/* Update scroll offset (scaled in proportion with change in excess) */
if (cur_excess <= 0) {
s->offset = 0;
} else {
s->offset = (full_size - visible_size) * s->offset / cur_excess;
}
well_length = s->length - 2 * SCROLLBAR_WIDTH;
if (s->full_size < 1) {
s->bar_len = well_length;
s->bar_pos = 0;
} else {
s->bar_len = (well_length * s->visible_size) / s->full_size;
s->bar_pos = (well_length * s->offset) / s->full_size;
}
msg.scrollbar = s;
msg.msg = SCROLLBAR_MSG_MOVED;
msg.scroll_offset = s->offset;
s->client_callback(s->client_data, &msg);
}
/*
* Exported function. Documented in scrollbar.h
*/
bool scrollbar_is_horizontal(struct scrollbar *s)
{
return s->horizontal;
}
/**
* Internal procedure used for starting a drag scroll for a scrollbar.
*
* \param s the scrollbar to start the drag for
* \param x the X coordinate of the drag start
* \param y the Y coordinate of the drag start
* \param content_drag whether this should be a reverse drag (used when the
* user drags the content area, rather than the scrollbar)
* \param pair whether the drag is a '2D' scroll
*/
static void scrollbar_drag_start_internal(struct scrollbar *s, int x, int y,
bool content_drag, bool pair)
{
struct scrollbar_msg_data msg;
s->drag_start_coord = s->horizontal ? x : y;
s->drag_start_pos = (content_drag) ? s->offset : s->bar_pos;
s->dragging = true;
s->drag_content = content_drag;
msg.scrollbar = s;
/* \todo - some proper numbers please! */
if (s->horizontal) {
msg.x0 = -2048;
msg.x1 = 2048;
msg.y0 = 0;
msg.y1 = 0;
} else {
msg.x0 = 0;
msg.x1 = 0;
msg.y0 = -2048;
msg.y1 = 2048;
}
if (pair && s->pair != NULL) {
s->pair_drag = true;
s->pair->drag_start_coord =
s->pair->horizontal ? x : y;
s->pair->drag_start_pos = (content_drag) ? s->pair->offset :
s->pair->bar_pos;
s->pair->dragging = true;
s->pair->drag_content = content_drag;
if (s->pair->horizontal) {
msg.x0 = -2048;
msg.x1 = 2048;
} else {
msg.y0 = -2048;
msg.y1 = 2048;
}
}
msg.msg = SCROLLBAR_MSG_SCROLL_START;
s->client_callback(s->client_data, &msg);
}
/*
* Exported function. Documented in scrollbar.h
*/
scrollbar_mouse_status scrollbar_mouse_action(struct scrollbar *s,
browser_mouse_state mouse, int x, int y)
{
int x0, y0, x1, y1;
int val;
scrollbar_mouse_status status = SCROLLBAR_MOUSE_NONE;
bool h;
/* we want mouse presses and mouse drags that were not started at the
* scrollbar indication bar to be launching actions on the scroll area
*/
bool but1 = ((mouse & BROWSER_MOUSE_PRESS_1) ||
((mouse & BROWSER_MOUSE_HOLDING_1) &&
(mouse & BROWSER_MOUSE_DRAG_ON) &&
!s->dragging));
bool but2 = ((mouse & BROWSER_MOUSE_PRESS_2) ||
((mouse & BROWSER_MOUSE_HOLDING_2) &&
(mouse & BROWSER_MOUSE_DRAG_ON) &&
!s->dragging));
h = s->horizontal;
x0 = 0;
y0 = 0;
x1 = h ? s->length : SCROLLBAR_WIDTH;
y1 = h ? SCROLLBAR_WIDTH : s->length;
if (!s->dragging && !(x >= x0 && x <= x1 && y >= y0 && y <= y1)) {
/* Not a drag and mouse outside scrollbar widget */
return SCROLLBAR_MOUSE_NONE;
}
if (h)
val = x;
else
val = y;
if (s->dragging) {
val -= s->drag_start_coord;
if (s->drag_content)
val = -val;
if (val != 0)
scrollbar_set(s, s->drag_start_pos + val,
!(s->drag_content));
if (s->pair_drag) {
scrollbar_mouse_action(s->pair, mouse, x, y);
status = SCROLLBAR_MOUSE_BOTH;
} else
status = h ? SCROLLBAR_MOUSE_HRZ : SCROLLBAR_MOUSE_VRT;
return status;
}
if (val < SCROLLBAR_WIDTH) {
/* left/up arrow */
status = h ? SCROLLBAR_MOUSE_LFT : SCROLLBAR_MOUSE_UP;
if (but1)
scrollbar_set(s, s->offset - SCROLLBAR_WIDTH, false);
else if (but2)
scrollbar_set(s, s->offset + SCROLLBAR_WIDTH, false);
} else if (val < SCROLLBAR_WIDTH + s->bar_pos) {
/* well between left/up arrow and bar */
status = h ? SCROLLBAR_MOUSE_PLFT : SCROLLBAR_MOUSE_PUP;
if (but1)
scrollbar_set(s, s->offset - s->length, false);
else if (but2)
scrollbar_set(s, s->offset + s->length, false);
} else if (val > s->length - SCROLLBAR_WIDTH) {
/* right/down arrow */
status = h ? SCROLLBAR_MOUSE_RGT : SCROLLBAR_MOUSE_DWN;
if (but1)
scrollbar_set(s, s->offset + SCROLLBAR_WIDTH, false);
else if (but2)
scrollbar_set(s, s->offset - SCROLLBAR_WIDTH, false);
} else if (val > SCROLLBAR_WIDTH + s->bar_pos +
s->bar_len) {
/* well between right/down arrow and bar */
status = h ? SCROLLBAR_MOUSE_PRGT : SCROLLBAR_MOUSE_PDWN;
if (but1)
scrollbar_set(s, s->offset + s->length, false);
else if (but2)
scrollbar_set(s, s->offset - s->length, false);
}
else {
/* scrollbar position indication bar */
status = h ? SCROLLBAR_MOUSE_HRZ : SCROLLBAR_MOUSE_VRT;
}
if (mouse & (BROWSER_MOUSE_DRAG_1 | BROWSER_MOUSE_DRAG_2) &&
(val >= SCROLLBAR_WIDTH + s->bar_pos
&& val < SCROLLBAR_WIDTH + s->bar_pos +
s->bar_len))
/* The mouse event is a drag start on the scrollbar position
* indication bar. */
scrollbar_drag_start_internal(s, x, y, false,
(mouse & BROWSER_MOUSE_DRAG_2) ? true : false);
return status;
}
/*
* Exported function. Documented in scrollbar.h
*/
const char *scrollbar_mouse_status_to_message(scrollbar_mouse_status status)
{
switch ((unsigned int) status) {
case SCROLLBAR_MOUSE_UP:
case SCROLLBAR_MOUSE_UP | SCROLLBAR_MOUSE_USED:
return messages_get("ScrollUp");
case SCROLLBAR_MOUSE_PUP:
case SCROLLBAR_MOUSE_PUP | SCROLLBAR_MOUSE_USED:
return messages_get("ScrollPUp");
case SCROLLBAR_MOUSE_VRT:
case SCROLLBAR_MOUSE_VRT | SCROLLBAR_MOUSE_USED:
return messages_get("ScrollV");
case SCROLLBAR_MOUSE_PDWN:
case SCROLLBAR_MOUSE_PDWN | SCROLLBAR_MOUSE_USED:
return messages_get("ScrollPDown");
case SCROLLBAR_MOUSE_DWN:
case SCROLLBAR_MOUSE_DWN | SCROLLBAR_MOUSE_USED:
return messages_get("ScrollDown");
case SCROLLBAR_MOUSE_LFT:
case SCROLLBAR_MOUSE_LFT | SCROLLBAR_MOUSE_USED:
return messages_get("ScrollLeft");
case SCROLLBAR_MOUSE_PLFT:
case SCROLLBAR_MOUSE_PLFT | SCROLLBAR_MOUSE_USED:
return messages_get("ScrollPLeft");
case SCROLLBAR_MOUSE_HRZ:
case SCROLLBAR_MOUSE_HRZ | SCROLLBAR_MOUSE_USED:
return messages_get("ScrollH");
case SCROLLBAR_MOUSE_PRGT:
case SCROLLBAR_MOUSE_PRGT | SCROLLBAR_MOUSE_USED:
return messages_get("ScrollPRight");
case SCROLLBAR_MOUSE_RGT:
case SCROLLBAR_MOUSE_RGT | SCROLLBAR_MOUSE_USED:
return messages_get("ScrollRight");
default:
break;
}
return NULL;
}
/*
* Exported function. Documented in scrollbar.h
*/
void scrollbar_mouse_drag_end(struct scrollbar *s,
browser_mouse_state mouse, int x, int y)
{
struct scrollbar_msg_data msg;
int val, drag_start_pos;
assert(s->dragging);
drag_start_pos = s->drag_start_pos;
val = (s->horizontal ? x : y) - s->drag_start_coord;
if (s->drag_content)
val = -val;
if (val != 0)
scrollbar_set(s, drag_start_pos + val, !(s->drag_content));
s->dragging = false;
s->drag_content = false;
if (s->pair_drag) {
s->pair_drag = false;
drag_start_pos = s->pair->drag_start_pos;
val = (s->pair->horizontal ? x : y) - s->pair->drag_start_coord;
if (s->pair->drag_content)
val = -val;
if (val != 0)
scrollbar_set(s->pair, drag_start_pos + val,
!(s->pair->drag_content));
s->pair->dragging = false;
s->pair->drag_content = false;
}
msg.scrollbar = s;
msg.msg = SCROLLBAR_MSG_SCROLL_FINISHED;
s->client_callback(s->client_data, &msg);
}
/*
* Exported function. Documented in scrollbar.h
*/
void scrollbar_start_content_drag(struct scrollbar *s, int x, int y)
{
scrollbar_drag_start_internal(s, x, y, true, true);
}
/*
* Exported function. Documented in scrollbar.h
*/
void scrollbar_make_pair(struct scrollbar *horizontal,
struct scrollbar *vertical)
{
assert(horizontal->horizontal &&
!vertical->horizontal);
horizontal->pair = vertical;
vertical->pair = horizontal;
}
/*
* Exported function. Documented in scrollbar.h
*/
void *scrollbar_get_data(struct scrollbar *s)
{
return s->client_data;
}
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