diff --git a/src/terminal/Makefile.am b/src/terminal/Makefile.am index 412e75a5..9e2781eb 100644 --- a/src/terminal/Makefile.am +++ b/src/terminal/Makefile.am @@ -34,6 +34,7 @@ noinst_HEADERS = \ cursor.h \ display.h \ ibar.h \ + scrollbar.h \ terminal.h \ terminal_handlers.h \ types.h @@ -46,6 +47,7 @@ libguac_terminal_la_SOURCES = \ cursor.c \ display.c \ ibar.c \ + scrollbar.c \ terminal.c \ terminal_handlers.c diff --git a/src/terminal/scrollbar.c b/src/terminal/scrollbar.c new file mode 100644 index 00000000..c1a5bc9a --- /dev/null +++ b/src/terminal/scrollbar.c @@ -0,0 +1,280 @@ +/* + * Copyright (C) 2015 Glyptodon LLC + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include "config.h" +#include "scrollbar.h" + +#include +#include +#include +#include + +#include + +guac_terminal_scrollbar* guac_terminal_scrollbar_alloc(guac_client* client, + const guac_layer* parent, int parent_width, int parent_height, int visible_area) { + + /* Allocate scrollbar */ + guac_terminal_scrollbar* scrollbar = + malloc(sizeof(guac_terminal_scrollbar)); + + /* Associate client */ + scrollbar->client = client; + + /* Init default min/max and value */ + scrollbar->min = 0; + scrollbar->max = 0; + scrollbar->value = 0; + + /* Init parent data */ + scrollbar->parent = parent; + scrollbar->parent_width = 0; + scrollbar->parent_height = 0; + scrollbar->visible_area = 0; + + /* Init handle render state */ + scrollbar->render_state.handle_x = 0; + scrollbar->render_state.handle_y = 0; + scrollbar->render_state.handle_width = 0; + scrollbar->render_state.handle_height = 0; + + /* Init container render state */ + scrollbar->render_state.container_x = 0; + scrollbar->render_state.container_y = 0; + scrollbar->render_state.container_width = 0; + scrollbar->render_state.container_height = 0; + + /* Allocate and init layers */ + scrollbar->container = guac_client_alloc_layer(client); + scrollbar->handle = guac_client_alloc_layer(client); + + /* Reposition and resize to fit parent */ + guac_terminal_scrollbar_parent_resized(scrollbar, + parent_width, parent_height, visible_area); + + return scrollbar; + +} + +void guac_terminal_scrollbar_free(guac_terminal_scrollbar* scrollbar) { + + /* Free layers */ + guac_client_free_layer(scrollbar->client, scrollbar->handle); + guac_client_free_layer(scrollbar->client, scrollbar->container); + + /* Free scrollbar */ + free(scrollbar); + +} + +/** + * Calculates the render state of the scroll bar, given its minimum, maximum, + * and current values. This render state will not be reflected graphically + * unless the scrollbar is flushed. + * + * @param scrollbar + * The scrollbar whose render state should be calculated. + * + * @param render_state + * A pointer to an existing guac_terminal_scrollbar_render_state that will + * be populated with the calculated result. + */ +static void calculate_render_state(guac_terminal_scrollbar* scrollbar, + guac_terminal_scrollbar_render_state* render_state) { + + /* Calculate container dimensions */ + render_state->container_width = GUAC_TERMINAL_SCROLLBAR_WIDTH; + render_state->container_height = scrollbar->parent_height; + + /* Calculate container position */ + render_state->container_x = scrollbar->parent_width + - render_state->container_width; + + render_state->container_y = 0; + + /* Calculate handle dimensions */ + render_state->handle_width = render_state->container_width + - GUAC_TERMINAL_SCROLLBAR_PADDING*2; + + /* Handle can be no bigger than the scrollbar itself */ + int max_handle_height = render_state->container_height + - GUAC_TERMINAL_SCROLLBAR_PADDING*2; + + /* Calculate legal delta between scroll values */ + int scroll_delta; + if (scrollbar->max > scrollbar->min) + scroll_delta = scrollbar->max - scrollbar->min; + else + scroll_delta = 0; + + /* Scale handle relative to visible area vs. scrolling region size */ + int proportional_height = max_handle_height + * scrollbar->visible_area + / (scroll_delta + scrollbar->visible_area); + + /* Ensure handle is no smaller than minimum height */ + if (proportional_height > GUAC_TERMINAL_SCROLLBAR_MIN_HEIGHT) + render_state->handle_height = proportional_height; + else + render_state->handle_height = GUAC_TERMINAL_SCROLLBAR_MIN_HEIGHT; + + /* Ensure handle is no larger than maximum height */ + if (render_state->handle_height > max_handle_height) + render_state->handle_height = max_handle_height; + + /* Calculate handle position */ + render_state->handle_x = GUAC_TERMINAL_SCROLLBAR_PADDING; + + /* Handle Y position is relative to current scroll value */ + if (scroll_delta > 0) + render_state->handle_y = GUAC_TERMINAL_SCROLLBAR_PADDING + + (max_handle_height - render_state->handle_height) + * (scrollbar->value - scrollbar->min) + / scroll_delta; + + /* ... unless there is only one possible scroll value */ + else + render_state->handle_y = GUAC_TERMINAL_SCROLLBAR_PADDING; + +} + +void guac_terminal_scrollbar_flush(guac_terminal_scrollbar* scrollbar) { + + guac_socket* socket = scrollbar->client->socket; + + /* Get old render state */ + guac_terminal_scrollbar_render_state* old_state = &scrollbar->render_state; + + /* Calculate new render state */ + guac_terminal_scrollbar_render_state new_state; + calculate_render_state(scrollbar, &new_state); + + /* Reposition container if moved */ + if (old_state->container_x != new_state.container_x + || old_state->container_y != new_state.container_y) { + + guac_protocol_send_move(socket, + scrollbar->container, scrollbar->parent, + new_state.container_x, + new_state.container_y, + 0); + + } + + /* Resize and redraw container if size changed */ + if (old_state->container_width != new_state.container_width + || old_state->container_height != new_state.container_height) { + + /* Set new size */ + guac_protocol_send_size(socket, scrollbar->container, + new_state.container_width, + new_state.container_height); + + /* Fill container with solid color */ + guac_protocol_send_rect(socket, scrollbar->container, 0, 0, + new_state.container_width, + new_state.container_height); + + guac_protocol_send_cfill(socket, GUAC_COMP_SRC, scrollbar->container, + 0x40, 0x40, 0x40, 0xFF); + + } + + /* Reposition handle if moved */ + if (old_state->handle_x != new_state.handle_x + || old_state->handle_y != new_state.handle_y) { + + guac_protocol_send_move(socket, + scrollbar->handle, scrollbar->container, + new_state.handle_x, + new_state.handle_y, + 0); + + } + + /* Resize and redraw handle if size changed */ + if (old_state->handle_width != new_state.handle_width + || old_state->handle_height != new_state.handle_height) { + + /* Send new size */ + guac_protocol_send_size(socket, scrollbar->handle, + new_state.handle_width, + new_state.handle_height); + + /* Fill and stroke handle with solid color */ + guac_protocol_send_rect(socket, scrollbar->handle, 0, 0, + new_state.handle_width, + new_state.handle_height); + + guac_protocol_send_cfill(socket, GUAC_COMP_SRC, scrollbar->handle, + 0x80, 0x80, 0x80, 0xFF); + + guac_protocol_send_cstroke(socket, GUAC_COMP_OVER, scrollbar->handle, + GUAC_LINE_CAP_SQUARE, GUAC_LINE_JOIN_MITER, 2, + 0xA0, 0xA0, 0xA0, 0xFF); + + } + + /* Store current render state */ + scrollbar->render_state = new_state; + +} + +void guac_terminal_scrollbar_set_bounds(guac_terminal_scrollbar* scrollbar, + int min, int max) { + + /* Fit value within bounds */ + if (scrollbar->value > max) + scrollbar->value = max; + else if (scrollbar->value < min) + scrollbar->value = min; + + /* Update bounds */ + scrollbar->min = min; + scrollbar->max = max; + +} + +void guac_terminal_scrollbar_set_value(guac_terminal_scrollbar* scrollbar, + int value) { + + /* Fit value within bounds */ + if (value > scrollbar->max) + value = scrollbar->max; + else if (value < scrollbar->min) + value = scrollbar->min; + + /* Update value */ + scrollbar->value = value; + +} + +void guac_terminal_scrollbar_parent_resized(guac_terminal_scrollbar* scrollbar, + int parent_width, int parent_height, int visible_area) { + + /* Assign new dimensions */ + scrollbar->parent_width = parent_width; + scrollbar->parent_height = parent_height; + scrollbar->visible_area = visible_area; + +} + diff --git a/src/terminal/scrollbar.h b/src/terminal/scrollbar.h new file mode 100644 index 00000000..e1bee7ff --- /dev/null +++ b/src/terminal/scrollbar.h @@ -0,0 +1,279 @@ +/* + * Copyright (C) 2015 Glyptodon LLC + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#ifndef GUAC_TERMINAL_SCROLLBAR_H +#define GUAC_TERMINAL_SCROLLBAR_H + +#include "config.h" + +#include +#include + +/** + * The width of the scrollbar, in pixels. + */ +#define GUAC_TERMINAL_SCROLLBAR_WIDTH 16 + +/** + * The number of pixels between the draggable handle of the scrollbar and the + * boundary of the containing layer. + */ +#define GUAC_TERMINAL_SCROLLBAR_PADDING 2 + +/** + * The minimum height of the draggable handle of the scrollbar, in pixels. + */ +#define GUAC_TERMINAL_SCROLLBAR_MIN_HEIGHT 64 + +/** + * The state of all scrollbar components, describing all variable aspects of + * the scrollbar's appearance. + */ +typedef struct guac_terminal_scrollbar_render_state { + + /** + * The current X-coordinate of the upper-left corner of the scrollbar's + * handle. This value will be relative to the scrollbar's containing layer. + */ + int handle_x; + + /** + * The current Y-coordinate of the upper-left corner of the scrollbar's + * handle. This value will be relative to the scrollbar's containing layer. + */ + int handle_y; + + /** + * The width of the scrollbar's handle. + */ + int handle_width; + + /** + * The height of the scrollbar's handle. + */ + int handle_height; + + /** + * The current X-coordinate of the upper-left corner of the scrollbar's + * containing layer. + */ + int container_x; + + /** + * The current Y-coordinate of the upper-left corner of the scrollbar's + * containing layer. + */ + int container_y; + + /** + * The width of the scrollbar's containing layer. + */ + int container_width; + + /** + * The height of the scrollbar's containing layer. + */ + int container_height; + +} guac_terminal_scrollbar_render_state; + +/** + * A scrollbar, made up of a containing layer and inner draggable handle. The + * position of the handle within the layer represents the value of the + * scrollbar. + */ +typedef struct guac_terminal_scrollbar { + + /** + * The client associated with this scrollbar. + */ + guac_client* client; + + /** + * The layer containing the scrollbar. + */ + const guac_layer* parent; + + /** + * The width of the parent layer, in pixels. + */ + int parent_width; + + /** + * The height of the parent layer, in pixels. + */ + int parent_height; + + /** + * The scrollbar itself. + */ + guac_layer* container; + + /** + * The draggable handle within the scrollbar, representing the current + * scroll value. + */ + guac_layer* handle; + + /** + * The minimum scroll value. + */ + int min; + + /** + * The maximum scroll value. + */ + int max; + + /** + * The size of the visible area, in the same units as min and max. + */ + int visible_area; + + /** + * The current scroll value. + */ + int value; + + /** + * The current state of all variable, visible parts of the scrollbar. + */ + guac_terminal_scrollbar_render_state render_state; + +} guac_terminal_scrollbar; + +/** + * Allocates a new scrollbar, associating that scrollbar with the given client + * and parent layer. The dimensions of the parent layer dictate the initial + * position of the scrollbar. Currently, the scrollbar is always anchored to + * the right edge of the parent layer. + * + * This will cause instructions to be written to the client's socket, but the + * client's socket will not be automatically flushed. + * + * @param client + * The client to associate with the new scrollbar. + * + * @param parent + * The layer which will contain the newly-allocated scrollbar. + * + * @param parent_width + * The width of the parent layer, in pixels. + * + * @param parent_height + * The height of the parent layer, in pixels. + * + * @param visible_area + * The amount of scrollable data that can be shown within the parent layer + * at any given time. This value uses the same units as min, max, and the + * current scroll value. + * + * @return + * A newly allocated scrollbar. + */ +guac_terminal_scrollbar* guac_terminal_scrollbar_alloc(guac_client* client, + const guac_layer* parent, int parent_width, int parent_height, + int visible_area); + +/** + * Frees the given scrollbar. + * + * @param scrollbar + * The scrollbar to free. + */ +void guac_terminal_scrollbar_free(guac_terminal_scrollbar* scrollbar); + +/** + * Flushes the render state of the given scrollbar, updating the remote display + * accordingly. + * + * This may cause instructions to be written to the client's socket, but the + * client's socket will not be automatically flushed. + * + * @param scrollbar + * The scrollbar whose render state is to be flushed. + */ +void guac_terminal_scrollbar_flush(guac_terminal_scrollbar* scrollbar); + +/** + * Sets the minimum and maximum allowed scroll values of the given scrollbar + * to the given values. If necessary, the current value of the scrollbar will + * be adjusted to fit within the new bounds. + * + * This may cause instructions to be written to the client's socket, but the + * client's socket will not be automatically flushed. + * + * @param scrollbar + * The scrollbar whose bounds are changing. + * + * @param min + * The new minimum value of the scrollbar. + * + * @param max + * The new maximum value of the scrollbar. + */ +void guac_terminal_scrollbar_set_bounds(guac_terminal_scrollbar* scrollbar, + int min, int max); + +/** + * Sets the current value of the given scrollbar. If the value specified does + * not fall within the scrollbar's defined minimum and maximum values, the + * value will be adjusted to fit. + * + * This may cause instructions to be written to the client's socket, but the + * client's socket will not be automatically flushed. + * + * @param scrollbar + * The scrollbar whose value is changing. + * + * @param value + * The value to assign to the scrollbar. If the value if out of bounds, it + * will be automatically adjusted to fit. + */ +void guac_terminal_scrollbar_set_value(guac_terminal_scrollbar* scrollbar, + int value); + +/** + * Notifies the scrollbar that the parent layer has been resized, and that the + * scrollbar may need to be repositioned or resized accordingly. + * + * This may cause instructions to be written to the client's socket, but the + * client's socket will not be automatically flushed. + * + * @param scrollbar + * The scrollbar whose parent layer has been resized. + * + * @param parent_width + * The new width of the parent layer, in pixels. + * + * @param parent_height + * The new height of the parent layer, in pixels. + * + * @param visible_area + * The amount of scrollable data that can be shown within the parent layer + * at any given time. This value uses the same units as min, max, and the + * current scroll value. + */ +void guac_terminal_scrollbar_parent_resized(guac_terminal_scrollbar* scrollbar, + int parent_width, int parent_height, int visible_area); + +#endif diff --git a/src/terminal/terminal.c b/src/terminal/terminal.c index 0fbeca79..7a1a9160 100644 --- a/src/terminal/terminal.c +++ b/src/terminal/terminal.c @@ -29,6 +29,7 @@ #include "display.h" #include "ibar.h" #include "guac_clipboard.h" +#include "scrollbar.h" #include "terminal.h" #include "terminal_handlers.h" #include "types.h" @@ -159,13 +160,17 @@ void guac_terminal_reset(guac_terminal* term) { term->cursor_row = term->visible_cursor_row = term->saved_cursor_row = 0; term->cursor_col = term->visible_cursor_col = term->saved_cursor_col = 0; - /* Clear scrollback, buffer, and scoll region */ + /* Clear scrollback, buffer, and scroll region */ term->buffer->top = 0; term->buffer->length = 0; term->scroll_start = 0; term->scroll_end = term->term_height - 1; term->scroll_offset = 0; + /* Reset scrollbar bounds */ + guac_terminal_scrollbar_set_bounds(term->scrollbar, term->term_height - term->buffer->length, 0); + guac_terminal_scrollbar_set_value(term->scrollbar, -term->scroll_offset); + /* Reset flags */ term->text_selected = false; term->application_cursor_keys = false; @@ -197,6 +202,11 @@ guac_terminal* guac_terminal_create(guac_client* client, }, .width = 1}; + /* Calculate available display area */ + int available_width = width - GUAC_TERMINAL_SCROLLBAR_WIDTH; + if (available_width < 0) + available_width = 0; + guac_terminal* term = malloc(sizeof(guac_terminal)); term->client = client; term->upload_path_handler = NULL; @@ -222,7 +232,7 @@ guac_terminal* guac_terminal_create(guac_client* client, term->current_attributes = default_char.attributes; term->default_char = default_char; - term->term_width = width / term->display->char_width; + term->term_width = available_width / term->display->char_width; term->term_height = height / term->display->char_height; /* Open STDOUT pipe */ @@ -250,6 +260,10 @@ guac_terminal* guac_terminal_create(guac_client* client, guac_terminal_display_resize(term->display, term->term_width, term->term_height); + /* Allocate scrollbar */ + term->scrollbar = guac_terminal_scrollbar_alloc(term->client, + GUAC_DEFAULT_LAYER, width, height, term->term_height); + /* Init terminal */ guac_terminal_reset(term); @@ -291,6 +305,9 @@ void guac_terminal_free(guac_terminal* term) { /* Free clipboard */ guac_common_clipboard_free(term->clipboard); + /* Free scrollbar */ + guac_terminal_scrollbar_free(term->scrollbar); + /* Free cursors */ guac_terminal_cursor_free(term->client, term->ibar_cursor); guac_terminal_cursor_free(term->client, term->blank_cursor); @@ -516,6 +533,9 @@ int guac_terminal_scroll_up(guac_terminal* term, if (term->buffer->length > term->buffer->available) term->buffer->length = term->buffer->available; + /* Reset scrollbar bounds */ + guac_terminal_scrollbar_set_bounds(term->scrollbar, term->term_height - term->buffer->length, 0); + /* Update cursor location if within region */ if (term->visible_cursor_row >= start_row && term->visible_cursor_row <= end_row) @@ -631,6 +651,7 @@ void guac_terminal_scroll_display_down(guac_terminal* terminal, /* Advance by scroll amount */ terminal->scroll_offset -= scroll_amount; + guac_terminal_scrollbar_set_value(terminal->scrollbar, -terminal->scroll_offset); /* Get row range */ end_row = terminal->term_height - terminal->scroll_offset - 1; @@ -666,6 +687,8 @@ void guac_terminal_scroll_display_down(guac_terminal* terminal, } guac_terminal_display_flush(terminal->display); + guac_terminal_scrollbar_flush(terminal->scrollbar); + guac_protocol_send_sync(terminal->client->socket, terminal->client->last_sent_timestamp); guac_socket_flush(terminal->client->socket); @@ -695,6 +718,7 @@ void guac_terminal_scroll_display_up(guac_terminal* terminal, /* Advance by scroll amount */ terminal->scroll_offset += scroll_amount; + guac_terminal_scrollbar_set_value(terminal->scrollbar, -terminal->scroll_offset); /* Get row range */ start_row = -terminal->scroll_offset; @@ -730,6 +754,8 @@ void guac_terminal_scroll_display_up(guac_terminal* terminal, } guac_terminal_display_flush(terminal->display); + guac_terminal_scrollbar_flush(terminal->scrollbar); + guac_protocol_send_sync(terminal->client->socket, terminal->client->last_sent_timestamp); guac_socket_flush(terminal->client->socket); @@ -1072,6 +1098,7 @@ static void __guac_terminal_resize(guac_terminal* term, int width, int height) { if (term->scroll_offset >= shift_amount) { term->scroll_offset -= shift_amount; + guac_terminal_scrollbar_set_value(term->scrollbar, -term->scroll_offset); /* Draw characters from scroll at bottom */ __guac_terminal_redraw_rect(term, term->term_height, 0, term->term_height + shift_amount - 1, width-1); @@ -1087,6 +1114,7 @@ static void __guac_terminal_resize(guac_terminal* term, int width, int height) { /* Update shift_amount and scroll based on new rows */ shift_amount -= term->scroll_offset; term->scroll_offset = 0; + guac_terminal_scrollbar_set_value(term->scrollbar, -term->scroll_offset); /* If anything remains, move screen as necessary */ if (shift_amount > 0) { @@ -1123,13 +1151,22 @@ int guac_terminal_resize(guac_terminal* terminal, int width, int height) { guac_client* client = display->client; guac_socket* socket = client->socket; + /* Calculate available display area */ + int available_width = width - GUAC_TERMINAL_SCROLLBAR_WIDTH; + if (available_width < 0) + available_width = 0; + /* Calculate dimensions */ int rows = height / display->char_height; - int columns = width / display->char_width; + int columns = available_width / display->char_width; /* Resize default layer to given pixel dimensions */ guac_protocol_send_size(socket, GUAC_DEFAULT_LAYER, width, height); + /* Notify scrollbar of resize */ + guac_terminal_scrollbar_parent_resized(terminal->scrollbar, width, height, rows); + guac_terminal_scrollbar_set_bounds(terminal->scrollbar, rows - terminal->buffer->length, 0); + /* Resize terminal if row/column dimensions have changed */ if (columns != terminal->term_width || rows != terminal->term_height) { @@ -1147,6 +1184,7 @@ int guac_terminal_resize(guac_terminal* terminal, int width, int height) { /* If terminal size hasn't changed, still need to flush */ else { + guac_terminal_scrollbar_flush(terminal->scrollbar); guac_protocol_send_sync(socket, client->last_sent_timestamp); guac_socket_flush(socket); } @@ -1158,6 +1196,7 @@ int guac_terminal_resize(guac_terminal* terminal, int width, int height) { void guac_terminal_flush(guac_terminal* terminal) { guac_terminal_commit_cursor(terminal); guac_terminal_display_flush(terminal->display); + guac_terminal_scrollbar_flush(terminal->scrollbar); } void guac_terminal_lock(guac_terminal* terminal) { diff --git a/src/terminal/terminal.h b/src/terminal/terminal.h index 0c530988..5f6e7ec2 100644 --- a/src/terminal/terminal.h +++ b/src/terminal/terminal.h @@ -30,6 +30,7 @@ #include "cursor.h" #include "display.h" #include "guac_clipboard.h" +#include "scrollbar.h" #include "types.h" #include @@ -117,6 +118,11 @@ struct guac_terminal { */ int stdin_pipe_fd[2]; + /** + * Graphical representation of the current scroll state. + */ + guac_terminal_scrollbar* scrollbar; + /** * The relative offset of the display. A positive value indicates that * many rows have been scrolled into view, zero indicates that no