weston/clients/keyboard.c

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/*
* Copyright © 2012 Openismus GmbH
* Copyright © 2012 Intel Corporation
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of the copyright holders not be used in
* advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. The copyright holders make
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/input.h>
#include <cairo.h>
#include "window.h"
#include "input-method-client-protocol.h"
#include "desktop-shell-client-protocol.h"
struct virtual_keyboard {
struct input_panel *input_panel;
struct input_method *input_method;
struct input_method_context *context;
struct display *display;
char *preedit_string;
};
enum key_type {
keytype_default,
keytype_backspace,
keytype_enter,
keytype_space,
keytype_switch,
keytype_symbols,
keytype_tab,
keytype_arrow_up,
keytype_arrow_left,
keytype_arrow_right,
keytype_arrow_down
};
struct key {
enum key_type key_type;
char *label;
char *alt;
unsigned int width;
};
static const struct key keys[] = {
{ keytype_default, "q", "Q", 1},
{ keytype_default, "w", "W", 1},
{ keytype_default, "e", "E", 1},
{ keytype_default, "r", "R", 1},
{ keytype_default, "t", "T", 1},
{ keytype_default, "y", "Y", 1},
{ keytype_default, "u", "U", 1},
{ keytype_default, "i", "I", 1},
{ keytype_default, "o", "O", 1},
{ keytype_default, "p", "P", 1},
{ keytype_backspace, "<--", "<--", 2},
{ keytype_tab, "->|", "->|", 1},
{ keytype_default, "a", "A", 1},
{ keytype_default, "s", "S", 1},
{ keytype_default, "d", "D", 1},
{ keytype_default, "f", "F", 1},
{ keytype_default, "g", "G", 1},
{ keytype_default, "h", "H", 1},
{ keytype_default, "j", "J", 1},
{ keytype_default, "k", "K", 1},
{ keytype_default, "l", "L", 1},
{ keytype_enter, "Enter", "Enter", 2},
{ keytype_switch, "ABC", "abc", 2},
{ keytype_default, "z", "Z", 1},
{ keytype_default, "x", "X", 1},
{ keytype_default, "c", "C", 1},
{ keytype_default, "v", "V", 1},
{ keytype_default, "b", "B", 1},
{ keytype_default, "n", "N", 1},
{ keytype_default, "m", "M", 1},
{ keytype_default, ",", ",", 1},
{ keytype_default, ".", ".", 1},
{ keytype_switch, "ABC", "abc", 1},
{ keytype_symbols, "?123", "?123", 1},
{ keytype_space, "", "", 6},
{ keytype_arrow_up, "/\\", "/\\", 1},
{ keytype_arrow_left, "<", "<", 1},
{ keytype_arrow_right, ">", ">", 1},
{ keytype_arrow_down, "\\/", "\\/", 1},
{ keytype_symbols, "?123", "?123", 1}
};
static const unsigned int columns = 12;
static const unsigned int rows = 4;
static const double key_width = 60;
static const double key_height = 50;
enum keyboard_state {
keyboardstate_default,
keyboardstate_uppercase
};
struct keyboard {
struct virtual_keyboard *keyboard;
struct window *window;
struct widget *widget;
enum keyboard_state state;
};
static void
draw_key(const struct key *key,
cairo_t *cr,
enum keyboard_state state,
unsigned int row,
unsigned int col)
{
const char *label;
cairo_text_extents_t extents;
cairo_save(cr);
cairo_rectangle(cr,
col * key_width, row * key_height,
key->width * key_width, key_height);
cairo_clip(cr);
/* Paint frame */
cairo_rectangle(cr,
col * key_width, row * key_height,
key->width * key_width, key_height);
cairo_set_line_width(cr, 3);
cairo_stroke(cr);
/* Paint text */
label = state == keyboardstate_default ? key->label : key->alt;
cairo_text_extents(cr, label, &extents);
cairo_translate(cr,
col * key_width,
row * key_height);
cairo_translate(cr,
(key->width * key_width - extents.width) / 2,
(key_height - extents.y_bearing) / 2);
cairo_show_text(cr, label);
cairo_restore(cr);
}
static void
redraw_handler(struct widget *widget, void *data)
{
struct keyboard *keyboard = data;
cairo_surface_t *surface;
struct rectangle allocation;
cairo_t *cr;
unsigned int i;
unsigned int row = 0, col = 0;
surface = window_get_surface(keyboard->window);
widget_get_allocation(keyboard->widget, &allocation);
cr = cairo_create(surface);
cairo_rectangle(cr, allocation.x, allocation.y, allocation.width, allocation.height);
cairo_clip(cr);
cairo_select_font_face(cr, "sans", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
cairo_set_font_size(cr, 16);
cairo_translate(cr, allocation.x, allocation.y);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_set_source_rgba(cr, 1, 1, 1, 0.75);
cairo_rectangle(cr, 0, 0, columns * key_width, rows * key_height);
cairo_paint(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
for (i = 0; i < sizeof(keys) / sizeof(*keys); ++i) {
cairo_set_source_rgb(cr, 0, 0, 0);
draw_key(&keys[i], cr, keyboard->state, row, col);
col += keys[i].width;
if (col >= columns) {
row += 1;
col = 0;
}
}
cairo_destroy(cr);
cairo_surface_destroy(surface);
}
static void
resize_handler(struct widget *widget,
int32_t width, int32_t height, void *data)
{
/* struct keyboard *keyboard = data; */
}
static void
keyboard_handle_key(struct keyboard *keyboard, const struct key *key)
{
const char *label = keyboard->state == keyboardstate_default ? key->label : key->alt;
switch (key->key_type) {
case keytype_default:
keyboard->keyboard->preedit_string = strcat(keyboard->keyboard->preedit_string,
label);
input_method_context_preedit_string(keyboard->keyboard->context,
keyboard->keyboard->preedit_string,
strlen(keyboard->keyboard->preedit_string));
break;
case keytype_backspace:
if (strlen(keyboard->keyboard->preedit_string) == 0) {
input_method_context_delete_surrounding_text(keyboard->keyboard->context,
-1, 1);
} else {
keyboard->keyboard->preedit_string[strlen(keyboard->keyboard->preedit_string) - 1] = '\0';
input_method_context_preedit_string(keyboard->keyboard->context,
keyboard->keyboard->preedit_string,
strlen(keyboard->keyboard->preedit_string));
}
break;
case keytype_enter:
input_method_context_key(keyboard->keyboard->context,
XKB_KEY_KP_Enter, WL_KEYBOARD_KEY_STATE_PRESSED);
break;
case keytype_space:
keyboard->keyboard->preedit_string = strcat(keyboard->keyboard->preedit_string,
" ");
input_method_context_preedit_string(keyboard->keyboard->context,
"",
0);
input_method_context_commit_string(keyboard->keyboard->context,
keyboard->keyboard->preedit_string,
strlen(keyboard->keyboard->preedit_string));
free(keyboard->keyboard->preedit_string);
keyboard->keyboard->preedit_string = strdup("");
break;
case keytype_switch:
if (keyboard->state == keyboardstate_default)
keyboard->state = keyboardstate_uppercase;
else
keyboard->state = keyboardstate_default;
break;
case keytype_symbols:
break;
case keytype_tab:
input_method_context_key(keyboard->keyboard->context,
XKB_KEY_Tab, WL_KEYBOARD_KEY_STATE_PRESSED);
break;
case keytype_arrow_up:
input_method_context_key(keyboard->keyboard->context,
XKB_KEY_Up, WL_KEYBOARD_KEY_STATE_PRESSED);
break;
case keytype_arrow_left:
input_method_context_key(keyboard->keyboard->context,
XKB_KEY_Left, WL_KEYBOARD_KEY_STATE_PRESSED);
break;
case keytype_arrow_right:
input_method_context_key(keyboard->keyboard->context,
XKB_KEY_Right, WL_KEYBOARD_KEY_STATE_PRESSED);
break;
case keytype_arrow_down:
input_method_context_key(keyboard->keyboard->context,
XKB_KEY_Down, WL_KEYBOARD_KEY_STATE_PRESSED);
break;
}
}
static void
button_handler(struct widget *widget,
struct input *input, uint32_t time,
uint32_t button,
enum wl_pointer_button_state state, void *data)
{
struct keyboard *keyboard = data;
struct rectangle allocation;
int32_t x, y;
int row, col;
unsigned int i;
if (state != WL_POINTER_BUTTON_STATE_PRESSED || button != BTN_LEFT) {
return;
}
input_get_position(input, &x, &y);
widget_get_allocation(keyboard->widget, &allocation);
x -= allocation.x;
y -= allocation.y;
row = y / key_height;
col = x / key_width + row * columns;
for (i = 0; i < sizeof(keys) / sizeof(*keys); ++i) {
col -= keys[i].width;
if (col < 0) {
keyboard_handle_key(keyboard, &keys[i]);
break;
}
}
widget_schedule_redraw(widget);
}
static void
input_method_context_surrounding_text(void *data,
struct input_method_context *context,
const char *text,
uint32_t cursor,
uint32_t anchor)
{
fprintf(stderr, "Surrounding text updated: %s\n", text);
}
static void
input_method_context_reset(void *data,
struct input_method_context *context)
{
struct virtual_keyboard *keyboard = data;
fprintf(stderr, "Reset pre-edit buffer\n");
if (strlen(keyboard->preedit_string)) {
input_method_context_preedit_string(context,
"",
0);
free(keyboard->preedit_string);
keyboard->preedit_string = strdup("");
}
}
static const struct input_method_context_listener input_method_context_listener = {
input_method_context_surrounding_text,
input_method_context_reset
};
static void
input_method_activate(void *data,
struct input_method *input_method,
struct input_method_context *context)
{
struct virtual_keyboard *keyboard = data;
if (keyboard->context)
input_method_context_destroy(keyboard->context);
if (keyboard->preedit_string)
free(keyboard->preedit_string);
keyboard->preedit_string = strdup("");
keyboard->context = context;
input_method_context_add_listener(context,
&input_method_context_listener,
keyboard);
}
static void
input_method_deactivate(void *data,
struct input_method *input_method,
struct input_method_context *context)
{
struct virtual_keyboard *keyboard = data;
if (!keyboard->context)
return;
input_method_context_destroy(keyboard->context);
keyboard->context = NULL;
}
static const struct input_method_listener input_method_listener = {
input_method_activate,
input_method_deactivate
};
static void
global_handler(struct wl_display *display, uint32_t id,
const char *interface, uint32_t version, void *data)
{
struct virtual_keyboard *keyboard = data;
if (!strcmp(interface, "input_panel")) {
keyboard->input_panel = wl_display_bind(display, id, &input_panel_interface);
} else if (!strcmp(interface, "input_method")) {
keyboard->input_method = wl_display_bind(display, id, &input_method_interface);
input_method_add_listener(keyboard->input_method, &input_method_listener, keyboard);
}
}
static void
keyboard_create(struct output *output, struct virtual_keyboard *virtual_keyboard)
{
struct keyboard *keyboard;
keyboard = malloc(sizeof *keyboard);
memset(keyboard, 0, sizeof *keyboard);
keyboard->keyboard = virtual_keyboard;
keyboard->window = window_create_custom(virtual_keyboard->display);
keyboard->widget = window_add_widget(keyboard->window, keyboard);
window_set_title(keyboard->window, "Virtual keyboard");
window_set_user_data(keyboard->window, keyboard);
widget_set_redraw_handler(keyboard->widget, redraw_handler);
widget_set_resize_handler(keyboard->widget, resize_handler);
widget_set_button_handler(keyboard->widget, button_handler);
window_schedule_resize(keyboard->window,
columns * key_width,
rows * key_height);
input_panel_set_surface(virtual_keyboard->input_panel,
window_get_wl_surface(keyboard->window),
output_get_wl_output(output));
}
static void
handle_output_configure(struct output *output, void *data)
{
struct virtual_keyboard *virtual_keyboard = data;
/* skip existing outputs */
if (output_get_user_data(output))
return;
output_set_user_data(output, virtual_keyboard);
keyboard_create(output, virtual_keyboard);
}
int
main(int argc, char *argv[])
{
struct virtual_keyboard virtual_keyboard;
virtual_keyboard.display = display_create(argc, argv);
if (virtual_keyboard.display == NULL) {
fprintf(stderr, "failed to create display: %m\n");
return -1;
}
virtual_keyboard.context = NULL;
virtual_keyboard.preedit_string = NULL;
wl_display_add_global_listener(display_get_display(virtual_keyboard.display),
global_handler, &virtual_keyboard);
display_set_user_data(virtual_keyboard.display, &virtual_keyboard);
display_set_output_configure_handler(virtual_keyboard.display, handle_output_configure);
display_run(virtual_keyboard.display);
return 0;
}