Merge pull request #24 from glyptodon/terminal-scrollbar

GUAC-803: Add mouse support to scrollbar

src/terminal/Makefile.am

@@ -34,6 +34,7 @@ noinst_HEADERS =                \
     cursor.h                    \
     display.h                   \
     ibar.h                      \
+    pointer.h                   \
     scrollbar.h                 \
     terminal.h                  \
     terminal_handlers.h         \
@@ -47,6 +48,7 @@ libguac_terminal_la_SOURCES =   \
     cursor.c                    \
     display.c                   \
     ibar.c                      \
+    pointer.c                   \
     scrollbar.c                 \
     terminal.c                  \
     terminal_handlers.c

src/terminal/pointer.c

@@ -0,0 +1,94 @@
+/*
+ * 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 "cursor.h"
+
+#include <cairo/cairo.h>
+#include <guacamole/client.h>
+#include <guacamole/protocol.h>
+#include <guacamole/socket.h>
+
+/* Macros for prettying up the embedded image. */
+#define X 0x00,0x00,0x00,0xFF
+#define U 0x80,0x80,0x80,0xFF
+#define O 0xFF,0xFF,0xFF,0xFF
+#define _ 0x00,0x00,0x00,0x00
+
+/* Dimensions */
+const int guac_terminal_pointer_width  = 11;
+const int guac_terminal_pointer_height = 16;
+
+/* Format */
+const cairo_format_t guac_terminal_pointer_format = CAIRO_FORMAT_ARGB32;
+const int guac_terminal_pointer_stride = 44;
+
+/* Embedded pointer graphic */
+unsigned char guac_terminal_pointer[] = {
+
+        O,_,_,_,_,_,_,_,_,_,_,
+        O,O,_,_,_,_,_,_,_,_,_,
+        O,X,O,_,_,_,_,_,_,_,_,
+        O,X,X,O,_,_,_,_,_,_,_,
+        O,X,X,X,O,_,_,_,_,_,_,
+        O,X,X,X,X,O,_,_,_,_,_,
+        O,X,X,X,X,X,O,_,_,_,_,
+        O,X,X,X,X,X,X,O,_,_,_,
+        O,X,X,X,X,X,X,X,O,_,_,
+        O,X,X,X,X,X,X,X,X,O,_,
+        O,X,X,X,X,X,O,O,O,O,O,
+        O,X,X,O,X,X,O,_,_,_,_,
+        O,X,O,_,O,X,X,O,_,_,_,
+        O,O,_,_,O,X,X,O,_,_,_,
+        O,_,_,_,_,O,X,X,O,_,_,
+        _,_,_,_,_,O,O,O,O,_,_
+
+};
+
+guac_terminal_cursor* guac_terminal_create_pointer(guac_client* client) {
+
+    guac_socket* socket = client->socket;
+    guac_terminal_cursor* cursor = guac_terminal_cursor_alloc(client);
+
+    /* Draw to buffer */
+    cairo_surface_t* graphic = cairo_image_surface_create_for_data(
+            guac_terminal_pointer,
+            guac_terminal_pointer_format,
+            guac_terminal_pointer_width,
+            guac_terminal_pointer_height,
+            guac_terminal_pointer_stride);
+
+    guac_protocol_send_png(socket, GUAC_COMP_SRC, cursor->buffer,
+            0, 0, graphic);
+    cairo_surface_destroy(graphic);
+
+    /* Initialize cursor properties */
+    cursor->width = guac_terminal_pointer_width;
+    cursor->height = guac_terminal_pointer_height;
+    cursor->hotspot_x = 0;
+    cursor->hotspot_y = 0;
+
+    return cursor;
+
+}
+

src/terminal/pointer.h

@@ -0,0 +1,68 @@
+/*
+ * 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_POINTER_H
+#define GUAC_TERMINAL_POINTER_H
+
+#include "config.h"
+
+#include <cairo/cairo.h>
+#include <guacamole/client.h>
+
+/**
+ * Width of the embedded mouse cursor graphic.
+ */
+extern const int guac_terminal_pointer_width;
+
+/**
+ * Height of the embedded mouse cursor graphic.
+ */
+extern const int guac_terminal_pointer_height;
+
+/**
+ * Number of bytes in each row of the embedded mouse cursor graphic.
+ */
+extern const int guac_terminal_pointer_stride;
+
+/**
+ * The Cairo grapic format of the mouse cursor graphic.
+ */
+extern const cairo_format_t guac_terminal_pointer_format;
+
+/**
+ * Embedded mouse cursor graphic.
+ */
+extern unsigned char guac_terminal_pointer[];
+
+/**
+ * Creates a new pointer cursor, returning the corresponding cursor object.
+ *
+ * @param client
+ *     The guac_client to send the cursor to.
+ *
+ * @return
+ *     A new cursor which must be free'd via guac_terminal_cursor_free().
+ */
+guac_terminal_cursor* guac_terminal_create_pointer(guac_client* client);
+
+#endif

src/terminal/scrollbar.c

@@ -67,6 +67,9 @@ guac_terminal_scrollbar* guac_terminal_scrollbar_alloc(guac_client* client,
     scrollbar->container = guac_client_alloc_layer(client);
     scrollbar->handle    = guac_client_alloc_layer(client);
 
+    /* Init mouse event state tracking */
+    scrollbar->dragging_handle = 0;
+
     /* Reposition and resize to fit parent */
     guac_terminal_scrollbar_parent_resized(scrollbar,
             parent_width, parent_height, visible_area);
@@ -87,19 +90,29 @@ void guac_terminal_scrollbar_free(guac_terminal_scrollbar* scrollbar) {
 }
 
 /**
- * Calculates the render state of the scroll bar, given its minimum, maximum,
+ * Calculates the state of the scroll bar, given its minimum, maximum, current
- * and current values. This render state will not be reflected graphically
+ * values, and the state of any dragging operation. The resulting render state
- * unless the scrollbar is flushed.
+ * will not be reflected graphically unless the scrollbar is flushed, and any
+ * resulting value will not be assigned to the scrollbar unless explicitly set
+ * with guac_terminal_scrollbar_set_value().
  *
  * @param scrollbar
- *     The scrollbar whose render state should be calculated.
+ *     The scrollbar whose 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.
+ *
+ * @param value
+ *     A pointer to an existing int that will be populated with the updated
+ *     scrollbar value.
  */
-static void calculate_render_state(guac_terminal_scrollbar* scrollbar,
+static void calculate_state(guac_terminal_scrollbar* scrollbar,
-        guac_terminal_scrollbar_render_state* render_state) {
+        guac_terminal_scrollbar_render_state* render_state,
+        int* value) {
+
+    /* Use unchanged current value by default */
+    *value = scrollbar->value;
 
     /* Calculate container dimensions */
     render_state->container_width  = GUAC_TERMINAL_SCROLLBAR_WIDTH;
@@ -141,13 +154,42 @@ static void calculate_render_state(guac_terminal_scrollbar* scrollbar,
     if (render_state->handle_height > max_handle_height)
         render_state->handle_height = max_handle_height;
 
-    /* Calculate handle position */
+    /* Calculate handle X position */
     render_state->handle_x = GUAC_TERMINAL_SCROLLBAR_PADDING;
 
+    /* Calculate handle Y range */
+    int min_handle_y = GUAC_TERMINAL_SCROLLBAR_PADDING;
+    int max_handle_y = min_handle_y + max_handle_height
+                     - render_state->handle_height;
+
+    /* Position handle relative to mouse if being dragged */
+    if (scrollbar->dragging_handle) {
+
+        int dragged_handle_y = scrollbar->drag_current_y
+                             - scrollbar->drag_offset_y;
+
+        /* Keep handle within bounds */
+        if (dragged_handle_y < min_handle_y)
+            dragged_handle_y = min_handle_y;
+        else if (dragged_handle_y > max_handle_y)
+            dragged_handle_y = max_handle_y;
+
+        render_state->handle_y = dragged_handle_y;
+
+        /* Calculate scrollbar value */
+        if (max_handle_y > min_handle_y) {
+            *value = scrollbar->min
+                   + (dragged_handle_y - min_handle_y)
+                      * scroll_delta
+                      / (max_handle_y - min_handle_y);
+        }
+
+    }
+
     /* Handle Y position is relative to current scroll value */
-    if (scroll_delta > 0)
+    else if (scroll_delta > 0)
-        render_state->handle_y = GUAC_TERMINAL_SCROLLBAR_PADDING
+        render_state->handle_y = min_handle_y
-            + (max_handle_height - render_state->handle_height)
+                               + (max_handle_y - min_handle_y)
                                   * (scrollbar->value - scrollbar->min)
                                   / scroll_delta;
 
@@ -161,12 +203,18 @@ void guac_terminal_scrollbar_flush(guac_terminal_scrollbar* scrollbar) {
 
     guac_socket* socket = scrollbar->client->socket;
 
-    /* Get old render state */
+    /* Get old state */
+    int old_value = scrollbar->value;
     guac_terminal_scrollbar_render_state* old_state = &scrollbar->render_state;
 
-    /* Calculate new render state */
+    /* Calculate new state */
+    int new_value;
     guac_terminal_scrollbar_render_state new_state;
-    calculate_render_state(scrollbar, &new_state);
+    calculate_state(scrollbar, &new_state, &new_value);
+
+    /* Notify of scroll if value is changing */
+    if (new_value != old_value && scrollbar->scroll_handler)
+        scrollbar->scroll_handler(scrollbar, new_value);
 
     /* Reposition container if moved */
     if (old_state->container_x != new_state.container_x
@@ -278,3 +326,53 @@ void guac_terminal_scrollbar_parent_resized(guac_terminal_scrollbar* scrollbar,
 
 }
 
+int guac_terminal_scrollbar_handle_mouse(guac_terminal_scrollbar* scrollbar,
+        int x, int y, int mask) {
+
+    /* Get container rectangle bounds */
+    int parent_left   = scrollbar->render_state.container_x;
+    int parent_top    = scrollbar->render_state.container_y;
+    int parent_right  = parent_left + scrollbar->render_state.container_width;
+    int parent_bottom = parent_top  + scrollbar->render_state.container_height;
+
+    /* Calculate handle rectangle bounds */
+    int handle_left   = parent_left + scrollbar->render_state.handle_x;
+    int handle_top    = parent_top  + scrollbar->render_state.handle_y;
+    int handle_right  = handle_left + scrollbar->render_state.handle_width;
+    int handle_bottom = handle_top  + scrollbar->render_state.handle_height;
+
+    /* Handle click on handle */
+    if (scrollbar->dragging_handle) {
+
+        /* Update drag while mouse button is held */
+        if (mask & GUAC_CLIENT_MOUSE_LEFT)
+            scrollbar->drag_current_y = y;
+
+        /* Stop drag if mouse button is released */
+        else
+            scrollbar->dragging_handle = 0;
+
+        /* Mouse event was handled by scrollbar */
+        return 1;
+
+    }
+    else if (mask == GUAC_CLIENT_MOUSE_LEFT
+            && x >= handle_left && x < handle_right
+            && y >= handle_top  && y < handle_bottom) {
+
+        /* Start drag */
+        scrollbar->dragging_handle = 1;
+        scrollbar->drag_offset_y = y - handle_top;
+        scrollbar->drag_current_y = y;
+
+        /* Mouse event was handled by scrollbar */
+        return 1;
+
+    }
+
+    /* Eat any events that occur within the scrollbar */
+    return x >= parent_left && x < parent_right
+        && y >= parent_top  && y < parent_bottom;
+
+}
+

src/terminal/scrollbar.h

@@ -96,12 +96,21 @@ typedef struct guac_terminal_scrollbar_render_state {
 
 } guac_terminal_scrollbar_render_state;
 
+typedef struct guac_terminal_scrollbar guac_terminal_scrollbar;
+
+/**
+ * Handler which is called whenever the scrollbar value changes outside a call
+ * to guac_terminal_scrollbar_set_value().
+ */
+typedef void guac_terminal_scrollbar_scroll_handler(
+        guac_terminal_scrollbar* scrollbar, int value);
+
 /**
  * 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 {
+struct guac_terminal_scrollbar {
 
     /**
      * The client associated with this scrollbar.
@@ -159,7 +168,36 @@ typedef struct guac_terminal_scrollbar {
      */
     guac_terminal_scrollbar_render_state render_state;
 
-} guac_terminal_scrollbar;
+    /**
+     * Whether the scrollbar handle is currently being dragged.
+     */
+    int dragging_handle;
+
+    /**
+     * The offset of the Y location of the mouse pointer when the dragging
+     * began, relative to the top of the scrollbar handle. If dragging is not
+     * in progress, this value is undefined.
+     */
+    int drag_offset_y;
+
+    /**
+     * The current Y location of the mouse pointer if dragging is in progress.
+     * If dragging is not in progress, this value is undefined.
+     */
+    int drag_current_y;
+
+    /**
+     * The function to call when the scrollbar handle is being dragged, and
+     * the new scrollbar value needs to be handled and assigned.
+     */
+    guac_terminal_scrollbar_scroll_handler* scroll_handler;
+
+    /**
+     * Arbitrary reference to data related to this scrollbar.
+     */
+    void* data;
+
+};
 
 /**
  * Allocates a new scrollbar, associating that scrollbar with the given client
@@ -276,4 +314,29 @@ 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, int visible_area);
 
+/**
+ * Notifies the scrollbar of the current mouse state, allowing it to update
+ * itself with respect to button state and dragging.
+ *
+ * @param scrollbar
+ *     The scrollbar to notify of the current mouse state.
+ *
+ * @param x
+ *     The X coordinate of the mouse pointer.
+ *
+ * @param y
+ *     The Y coordinate of the mouse pointer.
+ *
+ * @param mask
+ *     The button mask, where the Nth bit of the button mask represents the
+ *     pressed state of the Nth mouse button, where button 0 is the left
+ *     mouse button, button 1 is the middle button, etc.
+ *
+ * @return
+ *     Zero if the mouse event was not handled by the scrollbar, non-zero
+ *     otherwise.
+ */
+int guac_terminal_scrollbar_handle_mouse(guac_terminal_scrollbar* scrollbar,
+        int x, int y, int mask);
+
 #endif

src/terminal/terminal.c

@@ -29,6 +29,7 @@
 #include "display.h"
 #include "ibar.h"
 #include "guac_clipboard.h"
+#include "pointer.h"
 #include "scrollbar.h"
 #include "terminal.h"
 #include "terminal_handlers.h"
@@ -264,6 +265,10 @@ guac_terminal* guac_terminal_create(guac_client* client,
     term->scrollbar = guac_terminal_scrollbar_alloc(term->client,
             GUAC_DEFAULT_LAYER, width, height, term->term_height);
 
+    /* Associate scrollbar with this terminal */
+    term->scrollbar->data = term;
+    term->scrollbar->scroll_handler = guac_terminal_scroll_handler;
+
     /* Init terminal */
     guac_terminal_reset(term);
 
@@ -272,6 +277,7 @@ guac_terminal* guac_terminal_create(guac_client* client,
     term->mod_shift = 0;
 
     /* Set up mouse cursors */
+    term->pointer_cursor = guac_terminal_create_pointer(client);
     term->ibar_cursor    = guac_terminal_create_ibar(client);
     term->blank_cursor   = guac_terminal_create_blank(client);
 
@@ -309,6 +315,7 @@ void guac_terminal_free(guac_terminal* term) {
     guac_terminal_scrollbar_free(term->scrollbar);
 
     /* Free cursors */
+    guac_terminal_cursor_free(term->client, term->pointer_cursor);
     guac_terminal_cursor_free(term->client, term->ibar_cursor);
     guac_terminal_cursor_free(term->client, term->blank_cursor);
 
@@ -1379,17 +1386,39 @@ int guac_terminal_send_key(guac_terminal* term, int keysym, int pressed) {
 
 static int __guac_terminal_send_mouse(guac_terminal* term, int x, int y, int mask) {
 
+    guac_client* client = term->client;
+    guac_socket* socket = client->socket;
+
     /* Determine which buttons were just released and pressed */
     int released_mask =  term->mouse_mask & ~mask;
     int pressed_mask  = ~term->mouse_mask &  mask;
 
+    /* Notify scrollbar, do not handle anything handled by scrollbar */
+    if (guac_terminal_scrollbar_handle_mouse(term->scrollbar, x, y, mask)) {
+
+        /* Set pointer cursor if mouse is over scrollbar */
+        if (term->current_cursor != term->pointer_cursor) {
+            term->current_cursor = term->pointer_cursor;
+            guac_terminal_set_cursor(client, term->pointer_cursor);
+        }
+
+        /* Flush scrollbar */
+        guac_terminal_scrollbar_flush(term->scrollbar);
+        guac_protocol_send_sync(socket, client->last_sent_timestamp);
+        guac_socket_flush(socket);
+
+        return 0;
+
+    }
+
     term->mouse_mask = mask;
 
     /* Show mouse cursor if not already shown */
     if (term->current_cursor != term->ibar_cursor) {
         term->current_cursor = term->ibar_cursor;
-        guac_terminal_set_cursor(term->client, term->ibar_cursor);
+        guac_terminal_set_cursor(client, term->ibar_cursor);
-        guac_socket_flush(term->client->socket);
+        guac_protocol_send_sync(socket, client->last_sent_timestamp);
+        guac_socket_flush(socket);
     }
 
     /* Paste contents of clipboard on right or middle mouse button up */
@@ -1417,8 +1446,8 @@ static int __guac_terminal_send_mouse(guac_terminal* term, int x, int y, int mas
             free(string);
 
             /* Send data */
-            guac_common_clipboard_send(term->clipboard, term->client);
+            guac_common_clipboard_send(term->clipboard, client);
-            guac_socket_flush(term->client->socket);
+            guac_socket_flush(socket);
 
         }
 
@@ -1461,6 +1490,24 @@ int guac_terminal_send_mouse(guac_terminal* term, int x, int y, int mask) {
 
 }
 
+void guac_terminal_scroll_handler(guac_terminal_scrollbar* scrollbar, int value) {
+
+    guac_terminal* terminal = (guac_terminal*) scrollbar->data;
+
+    /* Calculate change in scroll offset */
+    int delta = -value - terminal->scroll_offset;
+
+    /* Update terminal based on change in scroll offset */
+    if (delta < 0)
+        guac_terminal_scroll_display_down(terminal, -delta);
+    else if (delta > 0)
+        guac_terminal_scroll_display_up(terminal, delta);
+
+    /* Update scrollbar value */
+    guac_terminal_scrollbar_set_value(scrollbar, value);
+
+}
+
 void guac_terminal_clipboard_reset(guac_terminal* term, const char* mimetype) {
     guac_common_clipboard_reset(term->clipboard, mimetype);
 }

src/terminal/terminal.h

@@ -307,6 +307,11 @@ struct guac_terminal {
      */
     int mouse_mask;
 
+    /**
+     * The cached pointer cursor.
+     */
+    guac_terminal_cursor* pointer_cursor;
+
     /**
      * The cached I-bar cursor.
      */
@@ -388,6 +393,19 @@ int guac_terminal_send_key(guac_terminal* term, int keysym, int pressed);
  */
 int guac_terminal_send_mouse(guac_terminal* term, int x, int y, int mask);
 
+/**
+ * Handles a scroll event received from the scrollbar associated with a
+ * terminal.
+ *
+ * @param scrollbar
+ *     The scrollbar that has been scrolled.
+ *
+ * @param value
+ *     The new value that should be stored within the scrollbar, and
+ *     represented within the terminal display.
+ */
+void guac_terminal_scroll_handler(guac_terminal_scrollbar* scrollbar, int value);
+
 /**
  * Clears the current clipboard contents and sets the mimetype for future
  * contents.