GUAC-803: Allocate/free and draw scrollbar. Reposition scrollbar when terminal is resized.

src/terminal/scrollbar.c

@@ -25,17 +25,52 @@
 
 #include <guacamole/client.h>
 #include <guacamole/layer.h>
+#include <guacamole/socket.h>
+#include <guacamole/protocol.h>
 
 #include <stdlib.h>
 
 guac_terminal_scrollbar* guac_terminal_scrollbar_alloc(guac_client* client,
-        guac_layer* parent, int parent_width, int parent_height) {
-    /* STUB */
-    return NULL;
+        const guac_layer* parent, int parent_width, int parent_height) {
+
+    /* 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;
+
+    /* Allocate and init layers */
+    scrollbar->container = guac_client_alloc_layer(client);
+    scrollbar->box       = guac_client_alloc_layer(client);
+
+    /* Reposition and resize to fit parent */
+    guac_terminal_scrollbar_parent_resized(scrollbar,
+            parent_width, parent_height);
+
+    return scrollbar;
+
 }
 
 void guac_terminal_scrollbar_free(guac_terminal_scrollbar* scrollbar) {
-    /* STUB */
+
+    /* Free layers */
+    guac_client_free_layer(scrollbar->client, scrollbar->box);
+    guac_client_free_layer(scrollbar->client, scrollbar->container);
+
+    /* Free scrollbar */
+    free(scrollbar);
+
 }
 
 void guac_terminal_scrollbar_set_bounds(guac_terminal_scrollbar* scrollbar,
@@ -50,6 +85,46 @@ void guac_terminal_scrollbar_set_value(guac_terminal_scrollbar* scrollbar,
 
 void guac_terminal_scrollbar_parent_resized(guac_terminal_scrollbar* scrollbar,
         int parent_width, int parent_height) {
-    /* STUB */
+
+    guac_socket* socket = scrollbar->client->socket;
+
+    /* Calculate container position and dimensions */
+    int container_x      = parent_width - GUAC_TERMINAL_SCROLLBAR_WIDTH;
+    int container_y      = 0;
+    int container_width  = GUAC_TERMINAL_SCROLLBAR_WIDTH;
+    int container_height = parent_height;
+
+    /* Calculate box position and dimensions */
+    int box_x      = GUAC_TERMINAL_SCROLLBAR_PADDING;
+    int box_y      = GUAC_TERMINAL_SCROLLBAR_PADDING;
+    int box_width  = GUAC_TERMINAL_SCROLLBAR_WIDTH - GUAC_TERMINAL_SCROLLBAR_PADDING*2;
+    int box_height = 64; /* STUB */
+
+    /* Reposition container relative to parent dimensions */
+    guac_protocol_send_move(socket,
+            scrollbar->container, scrollbar->parent,
+            container_x, container_y, 0);
+
+    /* Resize to fit within parent */
+    guac_protocol_send_size(socket, scrollbar->container,
+            container_width, container_height);
+
+    /* Reposition box relative to container and current value */
+    guac_protocol_send_move(socket,
+            scrollbar->box, scrollbar->container,
+            box_x, box_y, 0);
+
+    /* Resize box relative to scrollable area */
+    guac_protocol_send_size(socket, scrollbar->box,
+            box_width, box_height);
+
+    /* Fill box with solid color */
+    guac_protocol_send_rect(socket, scrollbar->box, 0, 0, box_width, box_height);
+    guac_protocol_send_cfill(socket, GUAC_COMP_SRC, scrollbar->box, 0xFF, 0xFF, 0xFF, 0x80);
+
+    /* Assign new dimensions */
+    scrollbar->parent_width  = parent_width;
+    scrollbar->parent_height = parent_height;
+
 }
 

src/terminal/scrollbar.h

@@ -79,7 +79,7 @@ typedef struct guac_terminal_scrollbar {
      * The movable box within the scrollbar, representing the current scroll
      * value.
      */
-    guac_layer* layer;
+    guac_layer* box;
 
     /**
      * The minimum scroll value.
@@ -123,7 +123,7 @@ typedef struct guac_terminal_scrollbar {
  *     A newly allocated scrollbar.
  */
 guac_terminal_scrollbar* guac_terminal_scrollbar_alloc(guac_client* client,
-        guac_layer* parent, int parent_width, int parent_height);
+        const guac_layer* parent, int parent_width, int parent_height);
 
 /**
  * Frees the given scrollbar.

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"
@@ -159,7 +160,7 @@ 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;
@@ -268,6 +269,10 @@ guac_terminal* guac_terminal_create(guac_client* client,
     /* Allocate clipboard */
     term->clipboard = guac_common_clipboard_alloc(GUAC_TERMINAL_CLIPBOARD_MAX_LENGTH);
 
+    /* Allocate scrollbar */
+    term->scrollbar = guac_terminal_scrollbar_alloc(term->client,
+            GUAC_DEFAULT_LAYER, width, height);
+
     return term;
 
 }
@@ -291,6 +296,9 @@ 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);
@@ -1130,6 +1138,9 @@ int guac_terminal_resize(guac_terminal* terminal, int width, int height) {
     /* 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);
+
     /* Resize terminal if row/column dimensions have changed */
     if (columns != terminal->term_width || rows != terminal->term_height) {
 

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 <pthread.h>
@@ -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