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netsurf/render/html_redraw.c
John Mark Bell 8a0965110f [project @ 2004-12-05 23:51:10 by jmb] 
Explicitly check for boxes with 0 area, as there's no point redrawing them

svn path=/import/netsurf/; revision=1384
2004-12-05 23:51:10 +00:00

955 lines
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/*
* This file is part of NetSurf, http://netsurf.sourceforge.net/
* Licensed under the GNU General Public License,
* http://www.opensource.org/licenses/gpl-license
* Copyright 2004 James Bursa <bursa@users.sourceforge.net>
*/
/** \file
* Redraw of a CONTENT_HTML (implementation).
*/
#include <assert.h>
#include <stdbool.h>
#include <string.h>
#include "netsurf/utils/config.h"
#include "netsurf/content/content.h"
#include "netsurf/css/css.h"
#include "netsurf/desktop/plotters.h"
#include "netsurf/render/box.h"
#include "netsurf/render/font.h"
#include "netsurf/render/form.h"
#include "netsurf/render/layout.h"
#include "netsurf/utils/log.h"
#include "netsurf/utils/messages.h"
#include "netsurf/utils/utils.h"
static bool html_redraw_box(struct box *box,
int x, int y,
int clip_x0, int clip_y0, int clip_x1, int clip_y1,
float scale, colour current_background_color);
static bool html_redraw_borders(struct box *box, int x, int y,
int padding_width, int padding_height, float scale);
static colour html_redraw_darker(colour c);
static colour html_redraw_lighter(colour c);
static colour html_redraw_aa(colour c0, colour c1);
static bool html_redraw_checkbox(int x, int y, int width, int height,
bool selected);
static bool html_redraw_radio(int x, int y, int width, int height,
bool selected);
static bool html_redraw_file(int x, int y, int width, int height,
struct box *box, float scale, colour background_colour);
static bool html_redraw_background(int x, int y,
struct box *box, float scale, colour background_colour);
static bool html_redraw_scrollbars(struct box *box, float scale,
int x, int y, int padding_width, int padding_height,
colour background_colour);
bool html_redraw_debug = false;
/**
* Draw a CONTENT_HTML using the current set of plotters (plot).
*
* \param c content of type CONTENT_HTML
* \param x coordinate for top-left of redraw
* \param y coordinate for top-left of redraw
* \param width available width (not used for HTML redraw)
* \param height available height (not used for HTML redraw)
* \param clip_x0 clip rectangle
* \param clip_y0 clip rectangle
* \param clip_x1 clip rectangle
* \param clip_y1 clip rectangle
* \param scale scale for redraw
* \param background_colour the background colour
* \return true if successful, false otherwise
*
* x, y, clip_[xy][01] are in target coordinates.
*/
bool html_redraw(struct content *c, int x, int y,
int width, int height,
int clip_x0, int clip_y0, int clip_x1, int clip_y1,
float scale, unsigned long background_colour)
{
struct box *box;
box = c->data.html.layout;
assert(box);
/* clear to background colour */
if (c->data.html.background_colour != TRANSPARENT)
background_colour = c->data.html.background_colour;
plot.clg(background_colour);
return html_redraw_box(box, x, y,
clip_x0, clip_y0, clip_x1, clip_y1,
scale, background_colour);
}
/**
* Recursively draw a box.
*
* \param box box to draw
* \param x coordinate of parent box
* \param y coordinate of parent box
* \param clip_x0 clip rectangle
* \param clip_y0 clip rectangle
* \param clip_x1 clip rectangle
* \param clip_y1 clip rectangle
* \param scale scale for redraw
* \param current_background_color background colour under this box
* \return true if successful, false otherwise
*
* x, y, clip_[xy][01] are in target coordinates.
*/
bool html_redraw_box(struct box *box,
int x, int y,
int clip_x0, int clip_y0, int clip_x1, int clip_y1,
float scale, colour current_background_color)
{
struct box *c;
int width, height;
int padding_left, padding_top, padding_width, padding_height;
int x0, y0, x1, y1;
int colour;
int x_scrolled, y_scrolled;
x += box->x * scale;
y += box->y * scale;
width = box->width * scale;
height = box->height * scale;
padding_left = box->padding[LEFT] * scale;
padding_top = box->padding[TOP] * scale;
padding_width = (box->padding[LEFT] + box->width +
box->padding[RIGHT]) * scale;
padding_height = (box->padding[TOP] + box->height +
box->padding[BOTTOM]) * scale;
x_scrolled = x - box->scroll_x * scale;
y_scrolled = y - box->scroll_y * scale;
/* calculate clip rectangle for this box */
if (box->style && box->style->overflow != CSS_OVERFLOW_VISIBLE) {
x0 = x;
y0 = y;
x1 = x + padding_width;
y1 = y + padding_height;
} else {
x0 = x + box->descendant_x0 * scale;
y0 = y + box->descendant_y0 * scale;
x1 = x + box->descendant_x1 * scale + 1;
y1 = y + box->descendant_y1 * scale + 1;
}
/* if visibility is hidden render children only */
if (box->style && box->style->visibility == CSS_VISIBILITY_HIDDEN) {
if (!plot.group_start("hidden box"))
return false;
for (c = box->children; c; c = c->next)
if (!html_redraw_box(c, x_scrolled, y_scrolled,
x0, y0, x1, y1,
scale, current_background_color))
return false;
return plot.group_end();
}
if (!plot.group_start("vis box"))
return false;
/* dotted debug outlines */
if (html_redraw_debug) {
if (!plot.rectangle(x, y, padding_width, padding_height,
1, 0x0000ff, true, false))
return false;
if (!plot.rectangle(x + padding_left, y + padding_top,
width, height, 1, 0xff0000, true, false))
return false;
if (!plot.rectangle(x - (box->border[LEFT] +
box->margin[LEFT]) * scale,
y - (box->border[TOP] +
box->margin[TOP]) * scale,
padding_width + (box->border[LEFT] +
box->margin[LEFT] + box->border[RIGHT] +
box->margin[RIGHT]) * scale,
padding_height + (box->border[TOP] +
box->margin[TOP] + box->border[BOTTOM] +
box->margin[BOTTOM]) * scale,
1, 0x00ffff, true, false))
return false;
}
/* borders */
if (box->style)
if (!html_redraw_borders(box, x, y,
padding_width, padding_height,
scale))
return false;
/* return if the box is completely outside the clip rectangle */
if (clip_y1 < y0 || y1 < clip_y0 || clip_x1 < x0 || x1 < clip_x0)
return plot.group_end();
if (box->type == BOX_BLOCK || box->type == BOX_INLINE_BLOCK ||
box->type == BOX_TABLE_CELL || box->object) {
/* find intersection of clip rectangle and box */
if (x0 < clip_x0) x0 = clip_x0;
if (y0 < clip_y0) y0 = clip_y0;
if (clip_x1 < x1) x1 = clip_x1;
if (clip_y1 < y1) y1 = clip_y1;
/* no point trying to draw 0-width/height boxes */
if (x0 == x1 || y0 == y1)
/* not an error, so return true */
return true;
/* clip to it */
if (!plot.clip(x0, y0, x1, y1))
return false;
} else {
/* clip box unchanged */
x0 = clip_x0;
y0 = clip_y0;
x1 = clip_x1;
y1 = clip_y1;
}
/* background colour and image */
if (box->style && box->type != BOX_BR && (box->type != BOX_INLINE ||
box->style != box->parent->parent->style)) {
/* find intersection of clip box and padding box */
int px0 = x < x0 ? x0 : x;
int py0 = y < y0 ? y0 : y;
int px1 = x + padding_width < x1 ? x + padding_width : x1;
int py1 = y + padding_height < y1 ? y + padding_height : y1;
/* background colour */
if (box->style->background_color != TRANSPARENT &&
px0 < px1 && py0 < py1 &&
/* don't redraw background if there is an
* image covering it */
((box->style->background_repeat !=
CSS_BACKGROUND_REPEAT_REPEAT) ||
(box->background == NULL) ||
(box->background->bitmap == NULL) ||
/*(ro_gui_current_redraw_gui == NULL) ||
(!ro_gui_current_redraw_gui->
option.background_images) ||*/
(!bitmap_get_opaque(box->background->
bitmap)))) {
if (!plot.fill(px0, py0, px1, py1,
box->style->background_color))
return false;
/* set current background color for font painting */
current_background_color = box->style->background_color;
}
if ((box->background) && (px0 < px1) && (py0 < py1)) {
/* clip to padding box for everything but the main window */
if (box->parent) {
if (!plot.clip(px0, py0, px1, py1))
return false;
} else {
if (!plot.clip(clip_x0, clip_y0,
clip_x1, clip_y1))
return false;
}
/* plot background image */
if (!html_redraw_background(x, y, box, scale,
current_background_color))
return false;
/* restore previous graphics window */
if (!plot.clip(x0, y0, x1, y1))
return false;
}
}
if (box->object) {
if (!content_redraw(box->object,
x_scrolled + padding_left,
y_scrolled + padding_top,
width, height, x0, y0, x1, y1, scale,
current_background_color))
return false;
} else if (box->gadget && box->gadget->type == GADGET_CHECKBOX) {
if (!html_redraw_checkbox(x + padding_left, y + padding_top,
width, height,
box->gadget->selected))
return false;
} else if (box->gadget && box->gadget->type == GADGET_RADIO) {
if (!html_redraw_radio(x + padding_left, y + padding_top,
width, height,
box->gadget->selected))
return false;
} else if (box->gadget && box->gadget->type == GADGET_FILE) {
if (!html_redraw_file(x + padding_left, y + padding_top,
width, height, box, scale,
current_background_color))
return false;
} else if (box->text && box->font) {
/* antialias colour for under/overline */
colour = html_redraw_aa(current_background_color,
/*print_text_black ? 0 :*/ box->style->color);
if (box->style->text_decoration &
CSS_TEXT_DECORATION_UNDERLINE) {
if (!plot.line(x,
y + (int) (box->height * 0.9 * scale),
x + box->width * scale,
y + (int) (box->height * 0.9 * scale),
0, colour, false, false))
return false;
}
if (box->style->text_decoration &
CSS_TEXT_DECORATION_OVERLINE) {
if (!plot.line(x,
y + (int) (box->height * 0.1 * scale),
x + box->width * scale,
y + (int) (box->height * 0.1 * scale),
0, colour, false, false))
return false;
}
if (box->style->text_decoration &
CSS_TEXT_DECORATION_LINE_THROUGH) {
if (!plot.line(x,
y + (int) (box->height * 0.5 * scale),
x + box->width * scale,
y + (int) (box->height * 0.5 * scale),
0, colour, false, false))
return false;
}
if (!plot.text(x, y + (int) (box->height * 0.75 * scale),
box->font, box->text, box->length,
current_background_color,
/*print_text_black ? 0 :*/ box->style->color))
return false;
} else {
for (c = box->children; c != 0; c = c->next)
if (c->type != BOX_FLOAT_LEFT && c->type != BOX_FLOAT_RIGHT)
if (!html_redraw_box(c, x_scrolled, y_scrolled,
x0, y0, x1, y1, scale,
current_background_color))
return false;
for (c = box->float_children; c != 0; c = c->next_float)
if (!html_redraw_box(c, x_scrolled, y_scrolled,
x0, y0, x1, y1, scale,
current_background_color))
return false;
}
/* scrollbars */
if (box->style && box->type != BOX_BR && box->type != BOX_INLINE &&
(box->style->overflow == CSS_OVERFLOW_SCROLL ||
box->style->overflow == CSS_OVERFLOW_AUTO))
if (!html_redraw_scrollbars(box, scale, x, y,
padding_width, padding_height,
current_background_color))
return false;
if (box->type == BOX_BLOCK || box->type == BOX_INLINE_BLOCK ||
box->type == BOX_TABLE_CELL || box->object)
if (!plot.clip(clip_x0, clip_y0, clip_x1, clip_y1))
return false;
return plot.group_end();
}
/**
* Draw borders for a box.
*
* \param box box to draw
* \param x coordinate of left padding edge
* \param y coordinate of top padding edge
* \param padding_width width of padding box
* \param padding_height height of padding box
* \param scale scale for redraw
* \return true if successful, false otherwise
*/
bool html_redraw_borders(struct box *box, int x, int y,
int padding_width, int padding_height, float scale)
{
unsigned int i;
int top = box->border[TOP] * scale;
int right = box->border[RIGHT] * scale;
int bottom = box->border[BOTTOM] * scale;
int left = box->border[LEFT] * scale;
int p[20] = {
x, y,
x - left, y - top,
x + padding_width + right, y - top,
x + padding_width, y,
x + padding_width, y + padding_height,
x + padding_width + right, y + padding_height + bottom,
x - left, y + padding_height + bottom,
x, y + padding_height,
x, y,
x - left, y - top
};
int z[8];
colour c;
bool dotted;
unsigned int light;
assert(box->style);
for (i = 0; i != 4; i++) {
if (box->border[i] == 0)
continue;
c = box->style->border[i].color;
dotted = false;
light = i;
switch (box->style->border[i].style) {
case CSS_BORDER_STYLE_DOTTED:
dotted = true;
case CSS_BORDER_STYLE_DASHED:
if (!plot.line((p[i * 4 + 0] + p[i * 4 + 2]) / 2,
(p[i * 4 + 1] + p[i * 4 + 3]) / 2,
(p[i * 4 + 4] + p[i * 4 + 6]) / 2,
(p[i * 4 + 5] + p[i * 4 + 7]) / 2,
box->border[i] * scale,
c, dotted, !dotted))
return false;
continue;
case CSS_BORDER_STYLE_SOLID:
break;
case CSS_BORDER_STYLE_DOUBLE:
z[0] = p[i * 4 + 0];
z[1] = p[i * 4 + 1];
z[2] = (p[i * 4 + 0] * 2 + p[i * 4 + 2]) / 3;
z[3] = (p[i * 4 + 1] * 2 + p[i * 4 + 3]) / 3;
z[4] = (p[i * 4 + 6] * 2 + p[i * 4 + 4]) / 3;
z[5] = (p[i * 4 + 7] * 2 + p[i * 4 + 5]) / 3;
z[6] = p[i * 4 + 6];
z[7] = p[i * 4 + 7];
if (!plot.polygon(z, 4, c))
return false;
z[0] = p[i * 4 + 2];
z[1] = p[i * 4 + 3];
z[2] = (p[i * 4 + 2] * 2 + p[i * 4 + 0]) / 3;
z[3] = (p[i * 4 + 3] * 2 + p[i * 4 + 1]) / 3;
z[4] = (p[i * 4 + 4] * 2 + p[i * 4 + 6]) / 3;
z[5] = (p[i * 4 + 5] * 2 + p[i * 4 + 7]) / 3;
z[6] = p[i * 4 + 4];
z[7] = p[i * 4 + 5];
if (!plot.polygon(z, 4, c))
return false;
continue;
case CSS_BORDER_STYLE_GROOVE:
light = 3 - light;
case CSS_BORDER_STYLE_RIDGE:
z[0] = p[i * 4 + 0];
z[1] = p[i * 4 + 1];
z[2] = (p[i * 4 + 0] + p[i * 4 + 2]) / 2;
z[3] = (p[i * 4 + 1] + p[i * 4 + 3]) / 2;
z[4] = (p[i * 4 + 6] + p[i * 4 + 4]) / 2;
z[5] = (p[i * 4 + 7] + p[i * 4 + 5]) / 2;
z[6] = p[i * 4 + 6];
z[7] = p[i * 4 + 7];
if (!plot.polygon(z, 4,
light == 0 || light == 1 ?
html_redraw_darker(c) :
html_redraw_lighter(c)))
return false;
z[0] = p[i * 4 + 2];
z[1] = p[i * 4 + 3];
z[6] = p[i * 4 + 4];
z[7] = p[i * 4 + 5];
if (!plot.polygon(z, 4,
light == 0 || light == 1 ?
html_redraw_lighter(c) :
html_redraw_darker(c)))
return false;;
continue;
case CSS_BORDER_STYLE_INSET:
if (i == 0 || i == 3)
c = html_redraw_darker(c);
else
c = html_redraw_lighter(c);
break;
case CSS_BORDER_STYLE_OUTSET:
if (i == 0 || i == 3)
c = html_redraw_lighter(c);
else
c = html_redraw_darker(c);
break;
default:
break;
}
if (!plot.polygon(p + i * 4, 4, c))
return false;
}
return true;
}
/**
* Make a colour darker.
*
* \param c colour
* \return a darker shade of c
*/
colour html_redraw_darker(colour c)
{
int b = c >> 16, g = (c >> 8) & 0xff, r = c & 0xff;
b = b * 3 / 4;
g = g * 3 / 4;
r = r * 3 / 4;
return (b << 16) | (g << 8) | r;
}
/**
* Make a colour lighter.
*
* \param c colour
* \return a lighter shade of c
*/
colour html_redraw_lighter(colour c)
{
int b = 0xff - (c >> 16), g = 0xff - ((c >> 8) & 0xff),
r = 0xff - (c & 0xff);
b = b * 3 / 4;
g = g * 3 / 4;
r = r * 3 / 4;
return ((0xff - b) << 16) | ((0xff - g) << 8) | (0xff - r);
}
/**
* Mix two colours to produce a colour suitable for anti-aliasing.
*
* \param c0 first colour
* \param c1 second colour
* \return a colour half way between c0 and c1
*/
colour html_redraw_aa(colour c0, colour c1)
{
return ((((c0 >> 16) + (c1 >> 16)) / 2) << 16) |
(((((c0 >> 8) & 0xff) + ((c1 >> 8) & 0xff)) / 2) << 8) |
((((c0 & 0xff) + (c1 & 0xff)) / 2) << 0);
}
/**
* Plot a checkbox.
*
* \param x left coordinate
* \param y top coordinate
* \param width dimensions of checkbox
* \param height dimensions of checkbox
* \param selected the checkbox is selected
* \return true if successful, false otherwise
*/
bool html_redraw_checkbox(int x, int y, int width, int height,
bool selected)
{
int z = width * 0.15;
if (z == 0)
z = 1;
if (!plot.fill(x, y, x + width, y + height, 0x000000))
return false;
if (!plot.fill(x + z, y + z, x + width - z, y + height - z, 0xffffff))
return false;
if (selected)
if (!plot.fill(x + z + z, y + z + z,
x + width - z - z, y + height - z - z,
0x0000ff))
return false;
return true;
}
/**
* Plot a radio icon.
*
* \param x left coordinate
* \param y top coordinate
* \param width dimensions of radio icon
* \param height dimensions of radio icon
* \param selected the radio icon is selected
* \return true if successful, false otherwise
*/
bool html_redraw_radio(int x, int y, int width, int height,
bool selected)
{
if (!plot.disc(x + width * 0.5, y + height * 0.5,
width * 0.5 - 1, 0x000000))
return false;
if (!plot.disc(x + width * 0.5, y + height * 0.5,
width * 0.4 - 1, 0xffffff))
return false;
if (selected)
if (!plot.disc(x + width * 0.5, y + height * 0.5,
width * 0.3 - 1, 0x0000ff))
return false;
return true;
}
/**
* Plot a file upload input.
*
* \param x left coordinate
* \param y top coordinate
* \param width dimensions of input
* \param height dimensions of input
* \param box box of input
* \param scale scale for redraw
* \param background_colour current background colour
* \return true if successful, false otherwise
*/
bool html_redraw_file(int x, int y, int width, int height,
struct box *box, float scale, colour background_colour)
{
int text_width;
const char *text;
size_t length;
if (box->gadget->value)
text = box->gadget->value;
else
text = messages_get("Form_Drop");
length = strlen(text);
text_width = nsfont_width(box->font, text, length) * scale;
if (width < text_width + 8)
x = x + width - text_width - 4;
else
x = x + 4;
return plot.text(x, y + height * 0.75, box->font, text, length,
background_colour,
/*print_text_black ? 0 :*/ box->style->color);
}
/**
* Plot background images.
*
* \param x coordinate of box
* \param y coordinate of box
* \param box box to draw background image of
* \param scale scale for redraw
* \param background_colour current background colour
* \return true if successful, false otherwise
*/
bool html_redraw_background(int x, int y,
struct box *box, float scale, colour background_colour)
{
int image_width, image_height;
bool repeat_x = false;
bool repeat_y = false;
assert(box->background);
/* only bitmaps handled currently */
if (!box->background->bitmap)
return true;
/* exit if background images aren't wanted */
/*if (ro_gui_current_redraw_gui)
if (!ro_gui_current_redraw_gui->option.background_images)
return true;
else if (!option_background_images)
return true;*/
/* get the image dimensions for our positioning and scaling */
image_width = box->background->width * scale;
image_height = box->background->height * scale;
/* handle background-repeat */
switch (box->style->background_repeat) {
case CSS_BACKGROUND_REPEAT_REPEAT:
repeat_x = repeat_y = true;
break;
case CSS_BACKGROUND_REPEAT_REPEAT_X:
repeat_x = true;
break;
case CSS_BACKGROUND_REPEAT_REPEAT_Y:
repeat_y = true;
break;
case CSS_BACKGROUND_REPEAT_NO_REPEAT:
break;
default:
break;
}
/* handle background-position */
switch (box->style->background_position.horz.pos) {
case CSS_BACKGROUND_POSITION_PERCENT:
x += (box->padding[LEFT] + box->width +
box->padding[RIGHT] - image_width) *
box->style->background_position.horz.
value.percent / 100;
break;
case CSS_BACKGROUND_POSITION_LENGTH:
x += (int) (css_len2px(&box->style->background_position.
horz.value.length, box->style) * scale);
break;
default:
break;
}
switch (box->style->background_position.vert.pos) {
case CSS_BACKGROUND_POSITION_PERCENT:
y += (box->padding[TOP] + box->height +
box->padding[BOTTOM] - image_height) *
box->style->background_position.vert.
value.percent / 100;
break;
case CSS_BACKGROUND_POSITION_LENGTH:
y -= (int) (css_len2px(&box->style->background_position.
vert.value.length, box->style) * scale);
break;
default:
break;
}
/* and plot the image */
return plot.bitmap_tile(x, y, image_width, image_height,
box->background->bitmap,
background_colour,
repeat_x, repeat_y);
}
/**
* Plot scrollbars for a scrolling box.
*
* \param box scrolling box
* \param scale scale for redraw
* \param x coordinate of box
* \param y coordinate of box
* \param padding_width width of padding box
* \param padding_height height of padding box
* \return true if successful, false otherwise
*/
bool html_redraw_scrollbars(struct box *box, float scale,
int x, int y, int padding_width, int padding_height,
colour background_colour)
{
const int w = SCROLLBAR_WIDTH * scale;
bool vscroll, hscroll;
int well_height, bar_top, bar_height;
int well_width, bar_left, bar_width;
const colour vcolour = box->style->border[RIGHT].color;
const colour hcolour = box->style->border[BOTTOM].color;
box_scrollbar_dimensions(box, padding_width, padding_height, w,
&vscroll, &hscroll,
&well_height, &bar_top, &bar_height,
&well_width, &bar_left, &bar_width);
#define TRIANGLE(x0, y0, x1, y1, x2, y2, c) \
if (!plot.line(x0, y0, x1, y1, scale, c, false, false)) \
return false; \
if (!plot.line(x0, y0, x2, y2, scale, c, false, false)) \
return false; \
if (!plot.line(x1, y1, x2, y2, scale, c, false, false)) \
return false;
/* fill scrollbar well(s) with background colour */
if (vscroll)
if (!plot.fill(x + padding_width - w, y,
x + padding_width, y + padding_height,
background_colour))
return false;
if (hscroll)
if (!plot.fill(x, y + padding_height - w,
x + padding_width, y + padding_height,
background_colour))
return false;
/* vertical scrollbar */
if (vscroll) {
/* left line */
if (!plot.line(x + padding_width - w, y,
x + padding_width - w, y + padding_height,
scale, vcolour, false, false))
return false;
/* up arrow */
TRIANGLE(x + padding_width - w / 2, y + w / 4,
x + padding_width - w * 3 / 4, y + w * 3 / 4,
x + padding_width - w / 4, y + w * 3 / 4,
vcolour);
/* separator */
if (!plot.line(x + padding_width - w, y + w,
x + padding_width, y + w,
scale, vcolour, false, false))
return false;
/* bar */
if (!plot.rectangle(x + padding_width - w * 3 / 4,
y + w + bar_top + w / 4,
w / 2, bar_height - w / 2,
scale, vcolour, false, false))
return false;
/* separator */
if (!plot.line(x + padding_width - w, y + w + well_height,
x + padding_width, y + w + well_height,
scale, vcolour, false, false))
return false;
/* down arrow */
TRIANGLE(x + padding_width - w / 2,
y + w + well_height + w * 3 / 4,
x + padding_width - w * 3 / 4,
y + w + well_height + w / 4,
x + padding_width - w / 4,
y + w + well_height + w / 4,
vcolour);
}
/* horizontal scrollbar */
if (hscroll) {
/* top line */
if (!plot.line(x, y + padding_height - w,
x + well_width + w + w, y + padding_height - w,
scale, hcolour, false, false))
return false;
/* left arrow */
TRIANGLE(x + w / 4, y + padding_height - w / 2,
x + w * 3 / 4, y + padding_height - w * 3 / 4,
x + w * 3 / 4, y + padding_height - w / 4,
hcolour);
/* separator */
if (!plot.line(x + w, y + padding_height - w,
x + w, y + padding_height,
scale, hcolour, false, false))
return false;
/* bar */
if (!plot.rectangle(x + w + bar_left + w / 4,
y + padding_height - w * 3 / 4,
bar_width - w / 2, w / 2,
scale, hcolour, false, false))
return false;
/* separator */
if (!plot.line(x + w + well_width, y + padding_height - w,
x + w + well_width, y + padding_height,
scale, hcolour, false, false))
return false;
/* right arrow */
TRIANGLE(x + w + well_width + w * 3 / 4,
y + padding_height - w / 2,
x + w + well_width + w / 4,
y + padding_height - w * 3 / 4,
x + w + well_width + w / 4,
y + padding_height - w / 4,
hcolour);
}
return true;
}
/**
* Determine if a box has a vertical scrollbar.
*
* \param box scrolling box
* \return the box has a vertical scrollbar
*/
bool box_vscrollbar_present(const struct box * const box)
{
return box->descendant_y0 < -box->border[TOP] ||
box->padding[TOP] + box->height + box->padding[BOTTOM] +
box->border[BOTTOM] < box->descendant_y1;
}
/**
* Determine if a box has a horizontal scrollbar.
*
* \param box scrolling box
* \return the box has a horizontal scrollbar
*/
bool box_hscrollbar_present(const struct box * const box)
{
return box->descendant_x0 < -box->border[LEFT] ||
box->padding[LEFT] + box->width + box->padding[RIGHT] +
box->border[RIGHT] < box->descendant_x1;
}
/**
* Calculate scrollbar dimensions and positions for a box.
*
* \param box scrolling box
* \param padding_width scaled width of padding box
* \param padding_height scaled height of padding box
* \param w scaled scrollbar width
* \param vscroll updated to vertical scrollbar present
* \param hscroll updated to horizontal scrollbar present
* \param well_height updated to vertical well height
* \param bar_top updated to top position of vertical scrollbar
* \param bar_height updated to height of vertical scrollbar
* \param well_width updated to horizontal well width
* \param bar_left updated to left position of horizontal scrollbar
* \param bar_width updated to width of horizontal scrollbar
*/
void box_scrollbar_dimensions(const struct box * const box,
const int padding_width, const int padding_height, const int w,
bool * const vscroll, bool * const hscroll,
int * const well_height,
int * const bar_top, int * const bar_height,
int * const well_width,
int * const bar_left, int * const bar_width)
{
*vscroll = box_vscrollbar_present(box);
*hscroll = box_hscrollbar_present(box);
*well_height = padding_height - w - w;
*bar_top = 0;
*bar_height = *well_height;
if (box->descendant_y1 - box->descendant_y0 != 0) {
*bar_top = (float) *well_height * (float) box->scroll_y /
(float) (box->descendant_y1 -
box->descendant_y0);
*bar_height = (float) *well_height * (float) box->height /
(float) (box->descendant_y1 -
box->descendant_y0);
}
*well_width = padding_width - w - w - (*vscroll ? w : 0);
*bar_left = 0;
*bar_width = *well_width;
if (box->descendant_x1 - box->descendant_x0 != 0) {
*bar_left = (float) *well_width * (float) box->scroll_x /
(float) (box->descendant_x1 -
box->descendant_x0);
*bar_width = (float) *well_width * (float) box->width /
(float) (box->descendant_x1 -
box->descendant_x0);
}
}
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