implementation of scrollbar widget. More...

#include <stdbool.h>
#include <stdlib.h>
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/utils.h"
#include "utils/nscolour.h"
#include "utils/nsoption.h"
#include "netsurf/browser_window.h"
#include "netsurf/mouse.h"
#include "netsurf/plotters.h"
#include "desktop/system_colour.h"
#include "desktop/scrollbar.h"

Include dependency graph for scrollbar.c:

Data Structures
struct	scrollbar
	Scrollbar context. More...

Functions
nserror	scrollbar_create (bool horizontal, int length, int full_size, int visible_size, void client_data, scrollbar_client_callback client_callback, struct scrollbar *s)
	Create a scrollbar. More...

void	scrollbar_destroy (struct scrollbar *s)
	Destroy a scrollbar. More...

static nserror	scrollbar_rectangle (const struct redraw_context ctx, struct rect area, colour c, bool inset)
	Draw an outline rectangle common to several scrollbar elements. More...

nserror	scrollbar_redraw (struct scrollbar s, int x, int y, const struct rect clip, float scale, const struct redraw_context *ctx)
	Redraw a part of the scrollbar. More...

void	scrollbar_set (struct scrollbar *s, int value, bool bar_pos)
	Set the scroll value of the scrollbar. More...

bool	scrollbar_scroll (struct scrollbar *s, int change)
	Scroll the scrollbar by given amount. More...

int	scrollbar_get_offset (struct scrollbar *s)
	Get the current scroll offset to the visible part of the full area. More...

void	scrollbar_set_extents (struct scrollbar *s, int length, int visible_size, int full_size)
	Set the length of the scrollbar widget, the size of the visible area, and the size of the full area. More...

bool	scrollbar_is_horizontal (struct scrollbar *s)
	Check orientation of the scrollbar. More...

static void	scrollbar_drag_start_internal (struct scrollbar *s, int x, int y, bool content_drag, bool pair)
	Internal procedure used for starting a drag scroll for a scrollbar. More...

scrollbar_mouse_status	scrollbar_mouse_action (struct scrollbar *s, browser_mouse_state mouse, int x, int y)
	Handle mouse actions other then drag ends. More...

const char *	scrollbar_mouse_status_to_message (scrollbar_mouse_status status)
	Get a status bar message from a scrollbar mouse input status. More...

void	scrollbar_mouse_drag_end (struct scrollbar *s, browser_mouse_state mouse, int x, int y)
	Handle end of mouse drags. More...

void	scrollbar_start_content_drag (struct scrollbar *s, int x, int y)
	Called when the content is being dragged to the scrollbars have to adjust. More...

void	scrollbar_make_pair (struct scrollbar horizontal, struct scrollbar vertical)
	Connect a horizontal and a vertical scrollbar into a pair so that they co-operate during 2D drags. More...

void *	scrollbar_get_data (struct scrollbar *s)
	Get the scrollbar's client data. More...

Detailed Description

implementation of scrollbar widget.

Definition in file scrollbar.c.

Function Documentation

◆ scrollbar_create()

nserror scrollbar_create	(	bool	horizontal,
		int	length,
		int	full_size,
		int	visible_size,
		void *	client_data,
		scrollbar_client_callback	client_callback,
		struct scrollbar **	s
	)

Create a scrollbar.

Parameters

horizontal	true = horizontal scrollbar, false = vertical
length	length of scrollbar widget
full_size	length of contained scrollable area
visible_size	length of visible part of scrollable area
client_data	data for the client callback
client_callback	client callback for scrollbar events
s	updated to point at the newly created scrollbar

Returns: NSERROR_OK and s updated if scrollbar has been created succesfully or eror code and s set to NULL on faliure;

Definition at line 93 of file scrollbar.c.

References scrollbar::bar_len, scrollbar::bar_pos, scrollbar::client_callback, scrollbar::client_data, scrollbar::drag_content, scrollbar::dragging, scrollbar::full_size, scrollbar::horizontal, scrollbar::length, NSERROR_NOMEM, NSERROR_OK, scrollbar::offset, scrollbar::pair, scrollbar::pair_drag, SCROLLBAR_WIDTH, and scrollbar::visible_size.

Referenced by box_handle_scrollbars(), browser_window_handle_scrollbars(), form_open_select_menu(), and textarea_reflow_multiline().

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◆ scrollbar_destroy()

void scrollbar_destroy ( struct scrollbar * s )

Destroy a scrollbar.

Parameters

s	the scrollbar to be destroyed

Definition at line 138 of file scrollbar.c.

References scrollbar::pair.

Referenced by box_free_box(), box_handle_scrollbars(), box_talloc_destructor(), browser_window_destroy_internal(), browser_window_handle_scrollbars(), form_free_select_menu(), textarea_destroy(), and textarea_reflow_multiline().

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◆ scrollbar_drag_start_internal()

static void scrollbar_drag_start_internal	(	struct scrollbar *	s,
		int	x,
		int	y,
		bool	content_drag,
		bool	pair
	)

static

Internal procedure used for starting a drag scroll for a scrollbar.

Parameters

s	the scrollbar to start the drag for
x	the X coordinate of the drag start
y	the Y coordinate of the drag start
content_drag	whether this should be a reverse drag (used when the user drags the content area, rather than the scrollbar)
pair	whether the drag is a '2D' scroll

Todo:: some proper numbers please!

Definition at line 712 of file scrollbar.c.

References scrollbar::bar_pos, scrollbar::client_callback, scrollbar::client_data, scrollbar::drag_content, scrollbar::drag_start_coord, scrollbar::drag_start_pos, scrollbar::dragging, scrollbar::horizontal, scrollbar_msg_data::msg, scrollbar::offset, scrollbar::pair, scrollbar::pair_drag, and SCROLLBAR_MSG_SCROLL_START.

Referenced by scrollbar_mouse_action(), and scrollbar_start_content_drag().

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◆ scrollbar_get_data()

void * scrollbar_get_data ( struct scrollbar * s )

Get the scrollbar's client data.

Parameters

s	the scrollbar to get the client data from

Returns: client data

Definition at line 1004 of file scrollbar.c.

References scrollbar::client_data.

Referenced by box_handle_scrollbars(), box_talloc_destructor(), html_overflow_scroll_drag_end(), and mouse_action_drag_scrollbar().

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◆ scrollbar_get_offset()

int scrollbar_get_offset ( struct scrollbar * s )

Get the current scroll offset to the visible part of the full area.

Parameters

s	the scrollbar to get the scroll offset value from

Returns: current scroll offset

Definition at line 628 of file scrollbar.c.

References scrollbar::offset.

Referenced by box_at_point(), box_coords(), box_nearest_text_box(), browser_window__get_contextual_content(), browser_window_drop_file_at_point_internal(), browser_window_get_position(), browser_window_mouse_click_internal(), browser_window_mouse_drag_end(), browser_window_mouse_track_internal(), browser_window_page_drag_start(), browser_window_redraw(), browser_window_scroll_at_point_internal(), browser_window_scroll_callback(), browser_window_update(), form_redraw_select_menu(), form_select_menu_clicked(), get_mouse_action_node(), html_redraw_box(), html_redraw_box_children(), textarea_scroll_visible(), and textarea_scrollbar_callback().

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◆ scrollbar_is_horizontal()

bool scrollbar_is_horizontal ( struct scrollbar * s )

Check orientation of the scrollbar.

Parameters

s	the scrollbar to check the orientation of

Returns: true for a horizontal scrollbar, else false (vertical)

Definition at line 695 of file scrollbar.c.

References scrollbar::horizontal.

Referenced by browser_window_scroll_callback(), html_overflow_scroll_drag_end(), and mouse_action_drag_scrollbar().

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◆ scrollbar_make_pair()

void scrollbar_make_pair	(	struct scrollbar *	horizontal,
		struct scrollbar *	vertical
	)

Connect a horizontal and a vertical scrollbar into a pair so that they co-operate during 2D drags.

Parameters

horizontal	the scrollbar used for horizontal scrolling
vertical	the scrollbar used for vertical scrolling

Definition at line 990 of file scrollbar.c.

References scrollbar::horizontal, and scrollbar::pair.

Referenced by box_handle_scrollbars(), browser_window_handle_scrollbars(), and textarea_reflow_multiline().

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◆ scrollbar_mouse_action()

scrollbar_mouse_status scrollbar_mouse_action	(	struct scrollbar *	s,
		browser_mouse_state	mouse,
		int	x,
		int	y
	)

Handle mouse actions other then drag ends.

Parameters

s	the scrollbar which gets the mouse action
mouse	mouse state
x	X coordinate of the mouse
y	Y coordinate of the mouse

Returns: the scrollbar mouse status

Definition at line 769 of file scrollbar.c.

References scrollbar::bar_len, scrollbar::bar_pos, BROWSER_MOUSE_DRAG_1, BROWSER_MOUSE_DRAG_2, BROWSER_MOUSE_DRAG_ON, BROWSER_MOUSE_HOLDING_1, BROWSER_MOUSE_HOLDING_2, BROWSER_MOUSE_PRESS_1, BROWSER_MOUSE_PRESS_2, scrollbar::drag_content, scrollbar::drag_start_coord, scrollbar::drag_start_pos, scrollbar::dragging, scrollbar::horizontal, scrollbar::length, scrollbar::offset, scrollbar::pair, scrollbar::pair_drag, scrollbar_drag_start_internal(), scrollbar_mouse_action(), SCROLLBAR_MOUSE_BOTH, SCROLLBAR_MOUSE_DWN, SCROLLBAR_MOUSE_HRZ, SCROLLBAR_MOUSE_LFT, SCROLLBAR_MOUSE_NONE, SCROLLBAR_MOUSE_PDWN, SCROLLBAR_MOUSE_PLFT, SCROLLBAR_MOUSE_PRGT, SCROLLBAR_MOUSE_PUP, SCROLLBAR_MOUSE_RGT, SCROLLBAR_MOUSE_UP, SCROLLBAR_MOUSE_VRT, scrollbar_set(), SCROLLBAR_WIDTH, scrollbar_msg_data::x0, scrollbar_msg_data::x1, scrollbar_msg_data::y0, and scrollbar_msg_data::y1.

Referenced by browser_window_mouse_click_internal(), browser_window_mouse_track_internal(), form_select_mouse_action(), mouse_action_drag_none(), mouse_action_drag_scrollbar(), scrollbar_mouse_action(), and textarea_mouse_scrollbar_action().

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◆ scrollbar_mouse_drag_end()

void scrollbar_mouse_drag_end	(	struct scrollbar *	s,
		browser_mouse_state	mouse,
		int	x,
		int	y
	)

Handle end of mouse drags.

Parameters

s	the scrollbar for which the drag ends
mouse	mouse state
x	X coordinate of the mouse
y	Y coordinate of the mouse

Definition at line 933 of file scrollbar.c.

References scrollbar::client_callback, scrollbar::client_data, scrollbar::drag_content, scrollbar::drag_start_coord, scrollbar::drag_start_pos, scrollbar::dragging, scrollbar::horizontal, scrollbar_msg_data::msg, scrollbar::pair, scrollbar::pair_drag, SCROLLBAR_MSG_SCROLL_FINISHED, and scrollbar_set().

Referenced by browser_window_mouse_drag_end(), form_select_mouse_drag_end(), html_overflow_scroll_drag_end(), and textarea_drag_end().

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◆ scrollbar_mouse_status_to_message()

const char * scrollbar_mouse_status_to_message ( scrollbar_mouse_status status )

Get a status bar message from a scrollbar mouse input status.

Parameters

status Status to convert to message

Returns: Message for the status bar or NULL on failure

Definition at line 889 of file scrollbar.c.

References messages_get(), SCROLLBAR_MOUSE_DWN, SCROLLBAR_MOUSE_HRZ, SCROLLBAR_MOUSE_LFT, SCROLLBAR_MOUSE_PDWN, SCROLLBAR_MOUSE_PLFT, SCROLLBAR_MOUSE_PRGT, SCROLLBAR_MOUSE_PUP, SCROLLBAR_MOUSE_RGT, SCROLLBAR_MOUSE_UP, SCROLLBAR_MOUSE_USED, and SCROLLBAR_MOUSE_VRT.

Referenced by browser_window_mouse_click_internal(), browser_window_mouse_track_internal(), form_select_mouse_action(), gadget_mouse_action(), mouse_action_drag_none(), and mouse_action_drag_scrollbar().

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◆ scrollbar_rectangle()

static nserror scrollbar_rectangle	(	const struct redraw_context *	ctx,
		struct rect *	area,
		colour	c,
		bool	inset
	)

inlinestatic

Draw an outline rectangle common to several scrollbar elements.

Parameters

ctx	current redraw context
area	the area of the scrollbar
c	base colour of the outline, the other colours are created by lightening or darkening this one
inset	true for inset outline, false for an outset one

Returns: NSERROR_OK on success else error code

Definition at line 158 of file scrollbar.c.

References blend_colour, darken_colour, lighten_colour, line(), plotter_table::line, NSERROR_OK, redraw_context::plot, PLOT_OP_TYPE_SOLID, plot_style_int_to_fixed, plot_style_s::stroke_colour, plot_style_s::stroke_type, rect::x0, rect::x1, rect::y0, and rect::y1.

Referenced by scrollbar_redraw().

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◆ scrollbar_redraw()

nserror scrollbar_redraw	(	struct scrollbar *	s,
		int	x,
		int	y,
		const struct rect *	clip,
		float	scale,
		const struct redraw_context *	ctx
	)

Redraw a part of the scrollbar.

Parameters

s	the scrollbar to be redrawn
x	the X coordinate to draw the scrollbar at
y	the Y coordinate to draw the scrollbar at
clip	the clipping rectangle
scale	scale for the redraw
ctx	current redraw context

Returns: NSERROR_OK on success otherwise error code

Definition at line 239 of file scrollbar.c.

References scrollbar::bar_len, scrollbar::bar_pos, clip(), plot_style_s::fill_colour, plot_style_s::fill_type, scrollbar::horizontal, scrollbar::length, NSCOLOUR_BUTTON_BG, NSCOLOUR_BUTTON_FG, NSCOLOUR_SCROLL_WELL, nscolours, NSERROR_OK, redraw_context::plot, PLOT_OP_TYPE_SOLID, plotter_table::polygon, plotter_table::rectangle, scrollbar_rectangle(), SCROLLBAR_WIDTH, rect::x0, rect::x1, rect::y0, and rect::y1.

Referenced by browser_window_redraw(), form_redraw_select_menu(), html_redraw_box(), and textarea_redraw().

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◆ scrollbar_scroll()

bool scrollbar_scroll	(	struct scrollbar *	s,
		int	change
	)

Scroll the scrollbar by given amount.

Parameters

s	the scrollbar to be scrolled
change	the change in scroll offset required (in px)

Returns: true iff the scrollbar was moved.

Definition at line 562 of file scrollbar.c.

References scrollbar::bar_pos, scrollbar::client_callback, scrollbar::client_data, scrollbar::full_size, scrollbar::length, scrollbar_msg_data::msg, scrollbar::offset, SCROLL_BOTTOM, SCROLL_PAGE_DOWN, SCROLL_PAGE_UP, SCROLL_TOP, SCROLLBAR_MSG_MOVED, SCROLLBAR_WIDTH, and scrollbar::visible_size.

Referenced by browser_window_scroll_at_point_internal(), html_scroll_at_point(), and textarea_scroll().

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◆ scrollbar_set()

void scrollbar_set	(	struct scrollbar *	s,
		int	value,
		bool	bar_pos
	)

Set the scroll value of the scrollbar.

Parameters

s	the scrollbar to have the value set
value	the new value to be set
bar_pos	true if the value is for the scrollbar indication bar position, false if it is for the scrolled area offset

Definition at line 512 of file scrollbar.c.

References scrollbar::bar_len, scrollbar::bar_pos, scrollbar::client_callback, scrollbar::client_data, scrollbar::full_size, scrollbar::length, scrollbar_msg_data::msg, scrollbar::offset, SCROLLBAR_MSG_MOVED, SCROLLBAR_WIDTH, and scrollbar::visible_size.

Referenced by browser_window_set_scroll(), html_object_callback(), scrollbar_mouse_action(), scrollbar_mouse_drag_end(), and textarea_scroll_visible().

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◆ scrollbar_set_extents()

void scrollbar_set_extents	(	struct scrollbar *	s,
		int	length,
		int	visible_size,
		int	full_size
	)

Set the length of the scrollbar widget, the size of the visible area, and the size of the full area.

Parameters

s	the scrollbar to set the values for
length	-1 or the new scrollbar widget length
visible_size	-1 or the new size of the visible area
full_size	-1 or the new size of the full contained area

Definition at line 640 of file scrollbar.c.

References scrollbar::bar_len, scrollbar::bar_pos, scrollbar::client_callback, scrollbar::client_data, scrollbar::full_size, scrollbar::length, scrollbar_msg_data::msg, scrollbar::offset, SCROLLBAR_MSG_MOVED, SCROLLBAR_WIDTH, and scrollbar::visible_size.

Referenced by box_handle_scrollbars(), browser_window_handle_scrollbars(), and textarea_reflow_multiline().

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◆ scrollbar_start_content_drag()

void scrollbar_start_content_drag	(	struct scrollbar *	s,
		int	x,
		int	y
	)

Called when the content is being dragged to the scrollbars have to adjust.

If the content has both scrollbars, and scrollbar_make_pair has beed called before, only the one scroll which will receive further mouse events has to be passed.

Parameters

s	one of the the scrollbars owned by the dragged content
x	X coordinate of mouse during drag start
y	Y coordinate of mouse during drag start

Definition at line 981 of file scrollbar.c.

References scrollbar_drag_start_internal().

Referenced by html_box_drag_start().

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Data Structures

Functions

Detailed Description

Function Documentation

◆ scrollbar_create()

◆ scrollbar_destroy()

◆ scrollbar_drag_start_internal()

◆ scrollbar_get_data()

◆ scrollbar_get_offset()

◆ scrollbar_is_horizontal()

◆ scrollbar_make_pair()

◆ scrollbar_mouse_action()

◆ scrollbar_mouse_drag_end()

◆ scrollbar_mouse_status_to_message()

◆ scrollbar_rectangle()

◆ scrollbar_redraw()

◆ scrollbar_scroll()

◆ scrollbar_set()

◆ scrollbar_set_extents()

◆ scrollbar_start_content_drag()